MA Manual DDX9101 9121a V1 - Haefely€¦ · V1.0.5 14/05/12 RK Using RIV with MUX option and...

Operating Instructions

HAEFELY TEST AG

DDX 9121a Partial Discharge Detector Version 1.0.6 4842282

Title Operating Instructions DDX 9121a Partial Discharge Detector

PartNo 4842282

Date 10-2012

Authors PT, UH, RK

Layout LWA

Revision History

V1.0.0 09/05/11 UH Initial release of the document

V1.0.1 25/01/12 RK,PT Update and revision with software version 3.4.3

V1.0.2 15/02/12 LW,PT Typos

V1.0.3 11/04/12 RK Using DDX with MUX option

V1.0.4 26/04/12 RK RIV calibration using KAL 9530

V1.0.5 14/05/12 RK Using RIV with MUX option and screen updates with version 4.0.1.0

V1.0.6 15/10/12 RK DC PD Testing

Warning

Before operating the instrument, be sure to read and understand fully the operating instructions. This instrument is connected to hazardous voltages . It is the responsibility of the user to ensure that the system is operated in a safe manner.

This equipment contains exposed terminals carrying hazardous voltages. There are no user serviceable components in the unit. All repairs and upgrades that require the unit to be opened must be referred to HAEFELY TEST AG or one of their nominated agents.

Unauthorized opening of the unit may damage the EMI protection of the system and will reduce its resistance to interference and transients. It may also cause the individual unit to be no longer compliant with the relevant EMC emission and susceptibility requirements. If the unit has been opened, the calibration will be rendered invalid.

In all correspondence, please quote the exact type number and serial number of the instrument and the version of software that is currently installed on it. The software version is reported in the remote software.

Note

HAEFELY TEST AG has a policy of continuing improvement on all their products. The design of this instrument will be subject to review and modification over its life. There may be small discrepancies between the manual and the operation of the instrument, particularly where software has been upgraded in the field. Although all efforts are made to ensure that there are no errors in the manuals, HAEFELY TEST AG accepts no responsibility for the accuracy of this manual.

HAEFELY TEST AG accepts no responsibility for damage or loss that may result from errors within this manual. We retain the right to modify the functionality, specification or operation of the instrument without prior notice.

All rights reserved. No section of this manual may be reproduced in any form, mechanical or electronic without the prior written permission of HAEFELY TEST AG.

2011, HAEFELY TEST AG, Switzerland

Manual Conventions

In the manual, the following conventions are used:

Indicates a matter of note - if it refers to a sequence of operations, failure to follow the instructions could result in errors in measurement.

Indicates hazards. There is a risk of equipment damage or personal injury or death. Carefully read and follow the instructions. Be sure to follow any safety instructions given in addition to those for the site at which tests are being performed.

Introduction I

Contents 1 Introduction 4

1.1 Introduction ..............................................................................................................4 1.2 Scope of Supply........................................................................................................4 1.3 Technical Data..........................................................................................................5

1.3.1 Physical and Environmental Specifications................................................5 1.3.2 PD Amplifier ..............................................................................................5 1.3.3 RIV Module................................................................................................5 1.3.4 Measurement System..................................................................................6 1.3.5 PD Capture And Display System................................................................6

2 Safety 7

2.1 Safety........................................................................................................................7 2.2 Grounding.................................................................................................................7 2.3 Connection To The Mains ........................................................................................7 2.4 Network connection..................................................................................................7 2.5 Essential Safety Recommendations ..........................................................................7

3 System Installation 8

3.1 General notes ............................................................................................................8 3.2 Connections ..............................................................................................................8

3.2.1 Standard Setup..........................................................................................10 3.2.2 Bushing Test Tap......................................................................................11

3.3 Minimum computer specification ...........................................................................12 3.4 Guideline ................................................................................................................12 3.5 Network planning & Setup .....................................................................................13

3.5.1 Basic requirements ...................................................................................13 3.5.2 HV regulator.............................................................................................14 3.5.3 Connection to a network...........................................................................14

3.6 Configuring the detectors .......................................................................................14 3.6.1 Configuring the DDX 9121a detector.......................................................14

3.7 Installing the remote software.................................................................................15 3.8 Starting the remote software ...................................................................................15 3.9 Upgrading the system .............................................................................................17

3.9.1 Remote software upgrade .........................................................................17 3.9.2 Detector software upgrade........................................................................17

4 System Operation 19

4.1 Front panel indicators .............................................................................................19 4.2 Switching the unit on and off..................................................................................19 4.3 Remote software layout ..........................................................................................20

4.3.1 Main window............................................................................................20 4.3.2 Toolbar controls........................................................................................20 4.3.3 Windows select panel ...............................................................................21

4.4 Prepare a test...........................................................................................................22 4.4.1 General test...............................................................................................22 4.4.2 Test information .......................................................................................23 4.4.3 HTML report ............................................................................................25 4.4.4 Regulator voltage profile ..........................................................................26

4.5 Run a test ................................................................................................................28 4.5.1 Calibrating the detectors...........................................................................29 4.5.2 Start the test ..............................................................................................32 4.5.3 Running an NQP test ................................................................................33 4.5.4 Print results...............................................................................................34

II Introduction

5 System Control and Settings 36

5.1 Detector display window ........................................................................................36 5.1.1 Window Size ............................................................................................36 5.1.2 Hiding Unused Measurement ...................................................................36 5.1.3 Controls ....................................................................................................37 5.1.4 Setting The Display Shape........................................................................38 5.1.5 Taking A Snapshot ...................................................................................39 5.1.6 Showing and Hiding the Display Controls ...............................................39 5.1.7 Setting the Synchronisation Source ..........................................................39

5.2 Detector control window ........................................................................................39 5.2.1 Available Controls....................................................................................39 5.2.2 Communications Status Indication ...........................................................40

5.3 Detector PD control window ..................................................................................40 5.3.1 Controlling the PD Amplifier ...................................................................40 5.3.2 Controlling the Gates................................................................................41 5.3.3 Voltage Calibration Controls....................................................................41 5.3.4 Capture Controls.......................................................................................42

5.4 Detector RIV control window.................................................................................43 5.4.1 RIV Controls ............................................................................................43 5.4.2 RIV Frequency Scan.................................................................................44 5.4.3 RIV calibration .........................................................................................45 5.4.4 Using hand-held calibrator 9220A............................................................45 5.4.5 Using KAL 9530. .....................................................................................45 5.4.6 Calibration of the reference Channel ........................................................45 5.4.7 Calibration of the measurement Channel..................................................46 5.4.8 Calibration of a multiple channel system..................................................52 5.4.9 Calibration of a single channel system with MUX option. .......................53

5.5 Detector control window preferences .....................................................................54 5.5.1 Display Measurement Type......................................................................54 5.5.2 Display Size..............................................................................................54 5.5.3 Save And Restore settings ........................................................................54

5.6 NQP Analysis Module............................................................................................56 5.6.1 Tool bars...................................................................................................56 5.6.2 Data Properties Panel................................................................................56 5.6.3 File Commands........................................................................................56 5.6.4 Display Commands .................................................................................56 5.6.5 View Commands .....................................................................................57 5.6.6 Procedure for doing an analysis................................................................57 5.6.7 Detector Panel ..........................................................................................58 5.6.8 File Panel..................................................................................................58 5.6.9 Filter Controls...........................................................................................59 5.6.10 Time Spliced Data Displays .....................................................................59 5.6.11 Other Displays ..........................................................................................60

5.7 Set system properties ..............................................................................................61 5.7.1 Allow Voltage Cal ....................................................................................61 5.7.2 Snapshot Image Size.................................................................................61 5.7.3 File Paths ..................................................................................................61 5.7.4 Enable Detector Settings Save..................................................................62

6 Report 63

6.1 HTML report ..........................................................................................................63 6.2 Tabular results ........................................................................................................64 6.3 Snapshot .................................................................................................................64

7 DDX with MUX option 66

7.1 Structure of a Multiplexer.......................................................................................66 7.2 Configuring the detectors .......................................................................................66

7.2.1 Configuring the DDX 9121a detector.......................................................66 7.3 Installing the remote software.................................................................................67 7.4 Starting the remote software ...................................................................................67 7.5 Display Control ......................................................................................................70 7.6 Calibration ..............................................................................................................70

Introduction III

7.7 Running a Test........................................................................................................71

8 DC PD Testing 72

8.1 Unlocking the DC PD Test Module........................................................................72 8.2 DC Tool Box ..........................................................................................................73 8.3 Performing the DC Test..........................................................................................74

8.3.1 Defining the parameters for the DC Test ..................................................74 8.3.2 Starting and stopping the test....................................................................74

8.4 Overview of the PD acceptance limits specified in the IEC Standards...................74 8.5 Display and Analysis of the Results. ......................................................................75

8.5.1 Q versus T Scatter Plot .............................................................................76 8.5.2 Accumulate Charge versus Time..............................................................77 8.5.3 Count > Charge ........................................................................................78 8.5.4 Count in Band...........................................................................................79 8.5.5 Pulse rate vs Time ....................................................................................80 8.5.6 Pulse rate in Band.....................................................................................81

8.6 Data Export, Printing and Reporting ......................................................................82 8.8.1 Report Generator ......................................................................................82 8.8.2 Copy to Clipboard ....................................................................................84 8.8.3 Print Graph ...............................................................................................84

9 Miscellaneous 85

9.1 Miscellaneous .........................................................................................................85 9.2 Care and Maintenance ............................................................................................85 9.3 Instrument Calibration............................................................................................85 9.4 Changing Fuses ......................................................................................................85 9.5 Instrument Storage..................................................................................................85 9.6 Packing and Transport ............................................................................................85 9.7 Recycling................................................................................................................86 9.8 Customer Support ...................................................................................................86

10 Declaration of Conformity 87

4 Introduction

1 Introduction

1.1 Introduction

The DDX 9121a partial discharge detector is a compact embedded instrument designed to be operated by remote PC control over a TCP/IP network connection. It is designed as a cost effective solution for multiple channel testing and multiple phase testing as well as a component for integration into centralized testing systems.

1.2 Scope of Supply

The following items are supplied as standard for a one channel system.

Qty Description

1 4842282 - DDX 9121a Operating instruction (this manual)

1 4840904 – Set of accessories DDX 9121a

1 4841988 – DDX 9121a PD measuring equipment

1 4842780 – KAL 9530 RIV Calibrator (option)

1 4842795, 4842822 – Set of accessories RIV calibrator (option)

1 4842362 – 20m BNC-BNC twin cable

1 4842223 – AQS9110a Coupling quadripole

On receipt of the unit check that all items have been delivered. Some items of this list may be changed to better fit to your application..

Introduction 5

1.3 Technical Data

1.3.1 Physical and Environmental Specifications

Mains Voltage 90 … 264 VAC

Mains Frequency 47 … 63 /440 Hz

Protecting Fuse T 2 Amp

Connection Fused IEC-320 Connector

Operating Temperature 0°C … +45°C

Storage Temperature -20°C ... +60°C

Relative Humidity 5% … 80%, non-condensing

Vibration/Shock 3 G

Dimensions (W x D x H) 483 mm x 306 mm x 89 mm

Weight 6.2 kg

1.3.2 PD Amplifier

Input Impedance 50 Ω

Max. Common Mode Voltage 50 V

High Pass Filter Settings 30, 50, 60, 80 kHz

Low Pass Filter Settings 100, 200, 300, 400, 500 kHz

IEEE Filters* 100 to 300 kHz

Input Attenuation Range 0 … 75 dB in 5dB steps

1.3.3 RIV Module

RF filter 3dB bandwidth 850 … 1150kHz

IF filter 6dB bandwidth +/-2KHz (US) and +/-4.5kHz

Image rejection > 55dB

Stop band attenuation > 70dB at +/-7.5kHz (US) > 60dB at +/-10kHz

Input Attenuation Range 0 … 35 dB in 5dB Steps

Noise floor < 4uV (AQS9110a coupling quadripole input)

< 6uV (AQS9110a and 1nF coupling capacitor)

Reading Accuracy +/-2dB

at 10Hz to 1000Hz PD pulse repetition rate

at 1/10 to 10 time the calibration level

Calibration level 100 uV

Quasi peak detector response As per NEMA 107, ANSI C63.2-1996

6 Introduction

1.3.4 Measurement System

Voltage Measurement Impedance

30 kΩ

Full Scale Input Voltage 10 VPeak

20 VPP

7.07 VRMS

Voltage Measurement IEC-60060 Dynamic Range

10 … 100 % FSD

Uncertainty Of Scale Factor Over Dynamic Range

1 %

Voltage Measurement Linearity Error

0.75 % FSD

Voltage Measurement Offset Error

0.2 % FSD

Voltage Measurement Resolution 0.05 % FSD

PD Measurement Linearity Error Meets Requirements of IEC 60270

PD Measurement System Analogue Peak Detector Designed to Specifications in IEC 60270

PD Measurement Resolution 0.05 % FSD

1.3.5 PD Capture And Display System

Pulse Phase Resolution 0.35 Degrees

Line Frequency Synchronisation 15 … 400 Hz

Cycle Capture Capability 1 … 128 Cycles

Pulse Display Resolution 0.78 %FSD

Safety 7

2 Safety

2.1 Safety

Safety is the responsibility of the user. Always operate the equipment in accordance with the instructions, always paying full attention to local safety practices and procedures

This equipment must be operated only by trained and competent personnel who are aware of the dangers and hazards involved in testing HV transformers or components. HAEFELY TEST AG accepts no liability for loss, damage, injury or death caused by the incorrect or unsafe operation of this instrument

2.2 Grounding

The instrument must always be connected to a grounded power outlet (i.e. a safety earth) It must never be operated in a non-grounded configuration as this may result in electrical shock to the user or damage to the instrument.

2.3 Connection To The Mains

Connection of the system to a supply voltage outside its operating range will result in damage to the system along with the risk of injury and fire.

2.4 Network connection

To prevent damage to the network infrastructure in the event of a flash-over, it is essential that an isolation barrier is provided using either a fibre-optic or wireless connection. Failure to implement such isolation can result in damage to the building infrastructure and IT systems in the event of a test sample failing under test voltages.

2.5 Essential Safety Recommendations

Before connecting the instrument ensure that the test object to be tested is completely de-energized and isolated from both line and load. Every terminal should be checked and verified before connection of the instrument. Ground connections may be left in place

Never operate the equipment in an explosive environment or where there are flammable gases or fumes

8 System Installation


3.1 General notes

The correct installation of a partial discharge measuring system requires the balancing of two conflicting demands: the arrangement of the test circuit to maximise the measurement circuit and the arrangement of the test circuit to minimise the risk of damage from flash-over. The installation of a PD measurement system requires an understanding of the mechanisms of PD measurement.

It is recommended that the HV system is provided with a low impedance ground/earth that is separate to the main building earth system and has an impedance less than 1 ohm Flat braid or flat copper strip should be for all ground/earth connections to minimize the effects of the skin effect.

For continued operator protection the ground/earth connection in the mains socket or the case of the instrument MUST be connected to a suitable protective ground/earth. If this is not done there is a significant safety risk for the operator in the event of a system or sample failure.

3.2 Connections

1 Power on switch

2 LED indicators

3 Ventilation openings

4 PD/RIV input

5 Voltage input

6 Equipment identification and serial number

7 Network 10/100BaseTX

8 Wing nut for HV system earth connection

9 Mains connection fuse and power on switch

Do not block any ventilation openings. Keep clean for proper cooling.

Always switch off the unit using front (1) or rear switch (9) before connecting or removing the power cord.

The Mains connection (9) must be connected to a suitable rated source of power. It carries the protective earth connection. This must be connected to a suitable protective earth, otherwise there is a safety risk for the operator.

(4) RIV available only on units with the RIV option.

System Installation 9

1 2

4

5

7 8

9

3 3

3 6

Figure :1 Front and rear panel connection

The PD/RIV Input (4) picks up the partial discharge pulses and RIV voltage from the coupling quadripole. This input is grounded to the case of the unit. The VM input (5) connects to the HV divider to allow the DDX 9121a to measure the applied HV. It also uses this input for synchronisation, so the divider output must be AC. The input is grounded with respect to the system ground and no common mode voltage can be tolerated between the two, either in continuous operation or under transient conditions. The “System Earth” (8) connection must be connected to the main HV ground/earth point using a suitable braid or copper foil connection. See the connection details for more information on this connection. For continued protection of the system and the operator it is imperative that this connection is made, or an equivalent provision is made. The 10/100BaseTX connector (7) provides connection to an Ethernet network utilising the TCP/IP protocol. If this is being used to connect to a single PC, the PC must be running on the same mains supply as the DDX 9121a and the two must be bonded together with a suitable braid ground/earth strap of less than 50cm length. If the DDX 9121a is to be connected to a factory network or to a PC running on a different mains supply, a suitable fibre optic isolation system should be used.


3.2.1 Standard Setup

HV Transformer

AQS9110a

PD

Voltage

DDX9121a

PD/RIV

Voltage

Coupling Capacitor Ck

Ck

Sample Under Test Ca

HV Ground

Figure :2 Standard setup with coupling capacitor

The Tettex- AQS 9110a is a general purpose passive quadripole/coupling impedance system for partial discharge and RIV measurement. The quadripole has a voltage divider low-arm fitted to it that should be ordered with the appropriate low arm capacitance installed in it.

To help minimise the effects of ground loop and the risk of damage during flashover, a “Star” grounding/earthing scheme is used for the system with the star point formed at the ground terminal of the Quadripole. The connections should be made with suitable braid or copper foil. This point should then be connected to the HV system earth point or to the wall of the screened room. Where the signals pass through the wall of a screened room to connect to the DDX-9121a suitable provision must be made to maintain signal integrity and isolation.

The “System Earth” terminal on the rear of the DDX 9121a provides the connection to connect the DDX 9121a to the system ground “Star” point described above. It does not provide a grounding/earthing path for the rest of the system.


3.2.2 Bushing Test Tap

HV Transformer

AQS9110a

PD

Voltage

DDX9121a

PD/RIV

Voltage

Ck

Sample

Under Test Ca

HV Ground

Bushing test tap

Figure :3 Bushing tap setup

Connection to the bushing test tap avoids the use of a coupling capacitor. The coupling capacitor is then the internal C1 capacitor of the bushing. In this configuration remove any other cable or connection that would come in parallel with the coupling quadripole, this may lead to lower sensitivity, higher noise level or erroneous measurements.


3.3 Minimum computer specification

The minimum specification for the control computer

Hard Disk Space 100MB

Ethernet adaptor 100 Base TX

Operating System XP, Vista and Windows 7

Web Browser Internet Explorer 7.0

Even if a different web browser is normally used, it is imperative that Microsoft Internet Explorer 5.0 or better is installed on the system, otherwise the system will not be able to display and print test reports. If a processor below the minimum specification is used, HAEFELY TEST AG can accept no responsibility for the performance of the system. Contact HAEFELY TEST AG for individual recommendations of the best specification for your application.

3.4 Guideline

To achieve the optimum performance from the system and the greatest reliability and protection for the networking system, the installation of the system should be carefully planned. Early involvement and cooperation with any appropriate IT department is required to enable a trouble free configuration and operation. This chapter presents some guidelines and assistance in setting up a network to manage the detectors. The following actions should be performed to set up the system: Network Planning and Setup Configuring the DDX-9121a Detectors Installing the Software Registering detectors with the software Additional steps when using an HV regulator: Configuring the Regulator Registering a regulator with the software The remote control software communicates with one or more DDX 9121a detectors over an Ethernet network. The number of detectors that can be operated by a single PC is limited by the processing power of that PC. For most modern PC (after 2010) the limit will be in the order of 12 detectors. For older systems, the practical limit on the number of detectors can be lower. Not all the features described in this manual are available with all detectors (For example RIV measurement). The type and functionality of the detector determines the functions available. For systems without RIV some functions will be hidden. Additionally, the remote control software can communicate with an HV regulator over an Ethernet network. The software is designed so that multiple test systems can be accommodated on a single network or sub-net. Each DDX 9121a is provided with a unique identification code. This is registered with the PC that wishes to use the detector, which allows the systems to be set up so that specific DDX-9121a detectors are used by specific PC's only. In this way multiple test systems can share the same network, and still be able to successfully interact with each other.


3.5 Network planning & Setup

3.5.1 Basic requirements

The PC and the detectors (or HV regulator) can be physically separated as long as they exist on the same network and sub-net without travelling through a router or gateway system (unless that is transparent to the two systems). If the PC controlling the DDX 9121a systems is within 2M (6ft) of the detectors there should be a 1/2" (12mm) wide braided earth connection made between the PC case metalwork and to the earth stud on one of the DDX 9121a detectors. If the PC controlling the DDX 9121a system is further than 2M (6ft) from a detector then the PC should be galvanically isolated from the detectors and connected via a wireless or fibre optic network. If the detectors (and regulator) are to be connected to another network, the installation should be performed in consultation and cooperation with the appropriate IT department, to preserve the network stability.

To prevent damage to the network infrastructure in the event of a flash-over, it is essential that an isolation barrier is provided using either a fibre-optic or wireless connection. Failure to implement such isolation can result in damage to the building infrastructure and IT systems in the event of a test sample failing under test voltages.

The PC can be directly connected to the DDX 9121a detector using a straight though RJ45 CAT5E cable. When more than one DDX detector is to be used or there is a need that the system is connected to another network an Ethenet Switch or hub has to be used as show in the following figure.

Ethernet/Internet

(DHCP server)

fiber-optics

or wireless

Ethernet hub

or switch PC

One or more DDX

Figure :4 Network connection

The PC and DDX 9121a can be configured to operate in one of three ways: Fixed IP Addresses. The recommended settings are PC: 192.168.0.100, Detector A: 192.168.0.101, Detector B: 192.168.0.102, etc. A subnet mask of 255.255.255.0 is used. IP Address allocation from a DHCP server. All detectors and the PC should be on the same subnet. Automatic Private IP Address (APIPA). If the PC and detectors are set to use DHCP and there is no DHCP server available then the PC and detectors will fall back to use APIPA. Addresses will be


automatically allocated in the 169.254.xxx.yyy range (where xxx, yyy are from 0 to 255) with a subnet mask of 255.255.0.0. The PC and DDX-9121a must all be set to use the same scheme. Users of the DDX-9121a should discuss their configuration requirements prior to the systems being shipped, so the configuration can be set at the factory. Fixed IP Addresses are the preferred method, followed by DHCP server and finally APIPA. If changes to the configuration are required contact the factory for assistance. The Default configuration for DDX-9121a is to use DHCP. See DDX 9121a section “Configuring the DDX 9121a Detectors” for changing this.

3.5.2 HV regulator

The physical connection of the HV regulator should be treated in the same way as a DDX 9121a. The regulator does not use the TCP/IP protocol and IP addressing scheme, as used by the DDX 9121a. Instead it uses IPX protocol and the unique physical address (MAC) of the network interfaces. There is no network configuration for the HV Regulator. The PC requires, in addition to the TCP/IP networking protocol, IPX network protocol. This should be configured using the "Network" option of the "Control Panel".

3.5.3 Connection to a network

Where the system is to be connected to any other network system, the department responsible for the Information Technology systems must be involved in the planning and implementation of the network system. They must be made aware of the potential risks and steps agreed and undertaken to eliminate those risks.

It is recommended that any connection between the building network is made using a fibre-optic link or a wireless link. If a wireless link is to be used it should be of the "Bridge" type, designed for linking two sections of network rather than the "Infrastructure" type (used to connect individual PCs to a network). If a fibre optic link is used, the cable should be routed to prevent any possibility of "tracking" down the router of the cable. Ideally a minimum length of 2M of cable should be used for the isolation, run in non-conductive trunking or conduit, separate to any cables feeding the High Voltage sections of the system or forming part of it.

The choice of whether to use fixed IP addressing or DHCP will be determined by the IT department. If fixed addressing is to be used, addresses must be defined for each PC and each detector on the system. The addresses for any PC and its corresponding detectors must be on the same sub-net, though different systems can exist on different sub-nets.

3.6 Configuring the detectors

3.6.1 Configuring the DDX 9121a detector

DDX 9121a detectors are received from the factory ready configured for your requirements. If it is necessary to change the setup, consult the factory for advice.


3.7 Installing the remote software

The remote software is supplied on CD-ROM. To install the software, place the CD into the CD-ROM drive. The setup application should run automatically. If it does not run "Setup.exe" from the CD-ROM. This will perform the software installation process.

The installation process is largely automatic - unless specific options are required for the location of files, allow the process to run automatically. If there is a problem during installation, or you wish to customise the installation, refer to the setup notes below. For printing it is necessary to set up the margins. This has to be done from within "Internet Explorer". Start Internet Explorer and select "Page Setup". In this window select the margins and set the left and right margins to the smallest possible amount that is supported by the printer. This will ensure that the test report does not overflow the limits of the page.

3.8 Starting the remote software

After installation of the 9101 remote software an Icon will appear on the desktop. Double click on this Icon to start the software.

The Remote Control Software is designed to operate with multiple detectors. It is also designed so that multiple PCs can run the software on the same network, with different detectors. Before the


software can run tests, the detectors that it is to be used must be registered in the software. As a standard the registering of the detectors is already done in house at Haefely Test AG in Basel, however the customer may want to register separately in order to work with only 1 or 2 detectors at the same time without being bothered by the views of the other detectors.

When there are multiple PCs on a network, they must be set-up to use different detectors. If a detector is registered to two PCs and both try to access it, the last one to make the connection will have control. The other PC will be disconnected from the detector, however if it tries to automatically connect, it will be able to take control - this can result in a “tug-of-war” between the two PC’s.

To register detectors with the software, ensure that the PC and all the detectors are connected to the network. Switch on the detectors and wait for start-up to finish. Once all the detectors running, start the software in Windows and choose from the menu on the PC software "Setup" then "Select Detectors…". This will display the following dialogue box:

The top line of the information indicates how many detectors have been found on the network and which position this detector takes in the sequence. The user moves through the detectors by pressing the "Next" and "Previous" buttons to move forward and backward in the list.

System Name allows the user to enter the title, which will be displayed by the software to identify the detector on test reports, snapshots and result files. This should not be too long, but it should be a meaningful description of the detector and its location/function.

Below the System Name edit box, the System ID (Machine ID) for the detector is shown. This is the unique identification code set in the DDX-9101 configuration (See "Configuring the DDX-9101 Detectors"). Along with this is shown the current IP address of the detector. If fixed IP addressing is used, this value will only vary if it is changed on the detector. If DHCP address allocation is used, this value may change frequently.

If two detectors with the same System ID (Machine ID) are on the same network, it is a matter of chance to which machine the software will connect. Set up the IDs to be different to avoid this situation from arising.

Use This Detector indicates whether this detector is to be used with this machine. Click to set the check-box if this detector is to be used with this PC. If this detector is no longer to be used with this machine, clear the check box. Next to the check box, the system indicates whether the detector is currently connected to this PC or not.

PD Trace Colour and Voltage Trace Colour indicate the colours to be used on test reports for drawing the PD and Voltage traces for this detector on the result graphs. Clicking on the coloured rectangle shows the colour selection dialogue box:


Select the colour to be used for the trace by clicking on the appropriately coloured square. Click OK to close the box and update the colour of the trace. If a colour not shown in the squares is required, clicking on "Define Custom Colours" allows a colour to be selected from a far wider range.

Once all the detectors have been selected and set-up, the changes are saved by clicking OK.

Note: When the system is being set-up for the first time, the system may report errors when the “select detectors” dialogue box is closed. This is because the system goes through an indeterminate state. Close the application and restart it before attempting to perform any tests.

3.9 Upgrading the system

As part of HAEFELY TEST AG policy of continuing improvement, revisions and upgrades to the software will be released to registered users of the system whose system is under a maintenance agreement or warranty. It is recommended that the system and the detectors are running the latest version for the best performance.

3.9.1 Remote software upgrade

Refer to install the remote software section

3.9.2 Detector software upgrade

The remote control software provides the means to upgrade the DDX 9121a internal software. When a new version of DDX 9121a software is released, power up all DDX-9121a detectors and check the version number. This can be found at the top of the system configuration screen. It is also shown on the remote software on the detector control window when the controls are shown, just to the right of the “Hide Controls” button. An upgrade is only required if the version number is less than the version number of the latest release. If any do not require upgrade, switch them off.


To perform the upgrade, power up all the detectors to be upgraded and run the remote control software. Ensure that all detectors to be upgraded have been detected by the software. Select "Setup" then "Upgrade DDX-9101

Detectors"; this will display a file selection box. Select the upgrade file, this will have a title of "DDX-9101.EXE".

DO NOT SELECT ANY FILE THAT YOU ARE NOT SURE ABOUT. IF AN INVALID UPGRADE FILE IS SELECTED THE DDX-9101 DETECTORS WILL BE RENDERED INOPERATIVE AND MUST BE RETURNED TO THE FACTORY FOR REPAIR.

Once the upgrade file has been selected, the system displays a message box:

If the file is correct and an upgrade is required, click "Yes", other wise click "No" to exit the procedure. The software then displays a second confirmation message:

To perform the upgrade click "No"; to cancel the operation click "Yes". If "No" is clicked, the upgrade operation is performed. This will take a few seconds to complete. Each detector will report the status of the upgrade. If there was a problem, a message box will be displayed reporting "<detector_name> reported an error during upgrade. Please try again". The detector will still run correctly but will not have the latest version of software in it.

If the upgrade was successful, "<detector_name> has been successfully upgraded. Please wait while the detectors restartsr" is displayed. Click OK to clear the message box. When they are restarted the detector will be running the latest software.

System Operation 19

4 System Operation

4.1 Front panel indicators

1 2 3 4

Figure :5 Front panel

1 Ready LED. Once the system has initialized , 1 minute from power up, the activity LED cycles between Red, Green and Amber. During software upgrade the led will keep on the same colour until the DDX detector reboots. Once the system has powered up, if the LED does not illuminate, or sticks on one colour, there is a problem with the system. Try shutting down the system and restating it. If this does not cure the problem, contact the factory for service.

2 PD capture LED. This LED shows the status of the PD capture system. Red indicates the system is halted, green indicates it is capturing and amber indicates a data transfer is in progress.

3 Location LED. Not used in this application. Should always remain off.

4 Over range LED. If the amplifier and measurement system is operating within its normal range, the LED will glow green or may not be illuminated. If the input signal causes the amplifier or measurement system to go outside their normal operating range, the LED will illuminate red until the system has gone back into the normal operating range. The LED may glow periodically during an autorange process. When using RIV the over range LED may indicates you have to change the RIV range.

4.2 Switching the unit on and off

The unit is switched on by pressing the front panel power switch. The green led of the switch indicates the unit is powered. If not, check that the rear panel switch is in position ‘1’. After a few seconds the system should emit a single beep to indicate that it has completed the first stage of the reset process. After about one minute, the activity LED should illuminate and start cycling between red, green and yellow. This indicates the system is fully operational and ready to use. If after five minutes, the activity LED is not illuminated and cycling its colour, shut the system down and restart it; if the problem persists consult the factory for assistance. The unit is switched off using by either the front or rear switch.

20 System Operation

4.3 Remote software layout

4.3.1 Main window

The Remote Software consists of a main window which contains a Display, Control and NQP form for each detector as well as several control forms.

Toolbar

Detector windows Control windows

4.3.2 Toolbar controls

The toolbar provides simple access to the majority of system functions:

12

11 13

14

15

16 10

9 8 7 6 5 3 2 1 17 18 19 4

The controls are: Edit Test Profile. This brings up the dialogue box to edit a test setup. Load Test Profile. This loads a previously stored test profile from disk. Save Test Profile. Save the current test profile to disk for later use. Use Last Calibration. Recall last PD and RIV calibration. Run Test. This runs the current test profile. It is only enabled when there is a loaded test profile and no other test is running.

System Operation 21

Stop Test. This stops the current test running ready for the test report. It is only enabled if a test is running. Print Results. This prints the HTML test report. It is only enabled when test results are available. Export Results. This exports the test results to a text file for use with other applications. Add Measurement. This adds an extra measurement to the result when running a test. Take Snapshot. This takes a snapshot from all currently connected detectors if a test is not running or all selected detectors if one is running. Show Test Control Window. This brings the test control window to the front. Show Test Results. This brings the test results window to the front. Show Snapshots. This brings the snapshots window to the front. Show HTML Report. This brings the HTML report to the front. Start NQP Test. This starts the NQP test. Stop NQP Test. This stops the current NQP test. Show Control Window. This brings the requested Control Window to the front. Show Detector. This brings the requested detector window to the front. Arrange Windows. This arranges all the windows into a default layout. Between the Export Results button and the Add measurement button, the system displays the current status of the test system.

4.3.3 Windows select panel

In addition to controls on the Toolbar for managing windows when multiple detectors are connected the main window has a slide out Window Selector. To show the Window Selector move the cursor over the left hand edge of main window. Clicking on a listed window will restore that window and bring it to the front of other windows. The Window Select panel will automatically hide when the cursor is moved off it.

Move cursor edge to show window view panel

Click to select window

22 System Operation

4.4 Prepare a test

4.4.1 General test

The general test setup is selected by clicking on the "General" tab towards the top of the window. This displays the general test setup parameters:

Selecting And Sequencing The Detectors For A Test The first stage in setting up a test is to select the detectors to be used for the test and the sequence in which they appear in the test report. The "Available Detectors" box and the "Detectors To Use" box between them show all detectors that are registered for use with this software (See "Registering Detectors With The Software") and that are currently connected to it. If a detector to be used for a test is not shown, it may be necessary to perform a "Disconnect" and then "Reconnect" to find it. If it still is not detected, check the detector is operational and connected to the network. The "Available Detectors" box show the detectors that are not allocated to the test being set up. When a new test is being set up this will be all connected detectors. The "Detectors To Use" box shows the detector to be used for the test. For a new test, this box will be empty. If no detectors are selected for use with a test, when the 'OK' button is pressed, the system automatically selects all the detectors listed in the “Available Detectors” window. Selecting A Detector to use

System Operation 23

To select a detector to use for a test, click on the detector in the "Available Detectors" box and then click on the right arrow button at the top right of the "Available Detectors" box. This will move it to the bottom of the list in the "Detectors To Use" box. Removing A Detector from the test To remove a detector from the test, click on the detector in the "Detectors To Use" box and then click on the left arrow button at the bottom left of the "Detectors To Use Box" . This will move it to the bottom of the list in the "Available Detectors" box. The sequence of the detectors in the "Detectors To Use" window indicates the order in which the detectors will appear on the test report form. The detector at the top of the list will appear first in the report (left hand side) with second down in the list next to it and so on. Moving A Detector up the list Click on the detector to be moved up in the "Detectors To Use" box and click the "Move Up" until it is in the desired position. Moving A Detector down the list Click on the detector to be moved up in the "Detectors To Use" box and click the "Move Dn" until it is in the desired position. Setting The Test Duration The test duration is set by entering the required duration in hours, minutes and seconds into the test duration boxes. The values entered must be greater than zero. For the hours and minutes, only a whole number can be set, though fractional seconds can be set. The values entered for the minutes and seconds must be less than 60. Errors will be reported if invalid values are set. If the test is intended to run for an unlimited or undefined duration, the "User Halts Test" box must be clicked, in order to stop the test. This disables the test duration edit boxes. When the test is run, it will continue until the user stops it. If the 'OK' button is clicked when no test duration has been set, the system automatically selects "User Halts Test" Setting The Graph And Table Update Intervals The update intervals for the results table and the results graph are set in the same way as the overall test duration. Care must be taken in selecting the values, as described on the "Test Setup" page. If an update interval greater than the test duration is set, no data will be recorded during the test. If a duration of zero is set, the graph or table will be updated as soon as the processor has time available to do the update. This is not recommended, as it will very quickly begin to slow down the system Setting The Graph Units The user can decide how the graph scales the time axis. By default it uses seconds, though by clicking on one of the "Graph In:" buttons, this can be changed to hours or minutes or back to seconds.

4.4.2 Test information

The test information screen is selected by clicking on the "Test Info" tab towards the top of the window. It displays the test information setup screen:

24 System Operation

Test Information Fields The user can set max. six test information fields for a test. These allow the user to enter parameters or identifiers for the test such as the test component type or the serial number of the unit under test. For each filed there is an edit box where the title of the field is entered. This title will be shown on the Test Control Window and on the Test Report generated at the end of a test. Next to each field is a box which indicates whether that information field is to be used for the report, or whether it is to be hidden. PD Failure Threshold The Failure PD Limit indicates the maximum acceptable level of discharge that can be tolerated on the device under test. This value is set in pC (pico-Coulombs). When the level recorded on a detector exceeds this threshold, the corresponding value in the test results table is shown as a negative value, while in the final test report it is shown in red. RIV Failure Threshold The Failure RIV Limit indicates the maximum acceptable level of discharge that can be tolerated on the device under test. This value is set in µV (micro-Volts). When the level recorded on a detector exceeds this threshold, the corresponding value in the test results table (txt-file) is shown as a negative value, while in the final test report it is shown in red. Nominal DUT Voltage The nominal DUT voltage is used to set the rated operating voltage of the Device Under Test (DUT). If this is set, and the "Show % of Nom. Rating" box is checked, the system displays the voltage of each measurement as a percentage of the nominal rated operating voltage of the system. Only Autorange In Test

System Operation 25

Setting this checkbox disables autoranging on all detectors when a test is not running. It can be overridden by setting the auto-range on the detector control window. Use this option for short tests where the time to auto-range the detector would be significant with respect to the test time. With this option set, the range is held while the testing is not in progress. Logarithmic PD Chart Setting this checkbox produces a test report where the PD magnitude is recorded on a logarithmic scale rather than a linear one.

4.4.3 HTML report

The HTML report screen is selected by clicking on the "HTML Report" tab towards the top of the window. It displays the HTML report setup screen:

The settings on this window determine how the test result grid is set up and how the data is displayed on the HTML test report. Show Logo When this option is checked, the logo indicated by the "Logo File" edit box will be displayed at the top of the test report. If this box is not checked no logo will be displayed. Show Table Border When this is checked, a line will be drawn around all entries in the test report to make them easier to separate. Separate Pages

26 System Operation

When this is checked, the results table, graphs and snapshots will all be printed on separate pages. Show Real Time When this is checked, the first column of the results table will show the actual time that each measurement was taken. If it is cleared only the time elapsed since the start of the test is shown. Show All Test Voltages When checked, the voltage recorded on each detector at each measurement will be shown. If it is cleared, only the voltage recorded on the detector that is at the top of the "Detectors To Use" list will be displayed on the results table. This control is dependent on the "Show % Of Nom. Rating". If the "Show % Of Nom Rating" is checked, "Show All Test Voltages" is cleared and disabled. Show % Of Nom. Rating When checked, the percentage of the nominal rating shown on the test information screen for each reading is displayed in the table. If this option is selected, it only allows the display of a single test voltages, it cannot be used with "Show All Test Voltages". When it is checked, the "Show All Test Voltages" is cleared and disabled. Signature Fields For each test, it is possible to have up to four signature fields. These are titles placed at the bottom of the test report for the test to be signed off by those responsible for performing the test and administering and issuing the results.

4.4.4 Regulator voltage profile

The regulator voltage profile test setup is selected by clicking on the "Voltage Profile" tab towards the top of the window. As per default no regulator is available for the system. This displays the voltage profile test setup parameters:

System Operation 27

Selecting The Regulator For A Test This stage of setting up a test is used when you have regulator whose voltage profile you want controlled automatically by the software, and/or whose voltage you want recorded by the software during the test. The first step is to select the regulator to be used for the test. The "Available Regulator" box and the "Regulator To Use" box between them show the regulator that is registered to be used with this software (See "Registering Regulators With The Software") and that which is to be used in the test. The voltage of the selected regulator in "Regulator To Use" will be recorded in the test results. The software can be used to manually control the regulator without recording the voltage. In which case simply do not select a "Regulator To Use". Selecting the Regulator to use To select the regulator to use for a test, click on the right arrow button. This will move it into the "Regulator To Use" box. Removing the Regulator from the test To remove the regulator from the test, click on the left arrow button . This will remove it from the "Regulator To Use" box. Manual Control If a tick is entered in "Manual Control" then the selected regulator in "Regulator To Use" will be under user control and the test duration will be controlled from the "General" test Setup. The voltage of the selected regulator will be recorded in the test results.

28 System Operation

If the tick is cleared from the "Manual Control" then the selected regulator in "Regulator To Use" will be under software control. The software will use the test voltages and dwell (duration) times setup in the "Voltage profile steps". The voltage of the selected regulator will be recorded in the test results. Voltage Profile Steps The voltages and dwell times for the test are entered in the "Voltage profile steps" grid. The software will apply the voltages for the given dwell time in the order shown in the list starting from the top. Test voltages are entered in kV. For example '40' or '15.5'. Dwell times are entered in hours, minutes and seconds. Hours can be from 0 to 10000. Minutes can be from 00 to 59. Seconds can be from 00 to 59. For example ten hours five minutes and fifteen seconds should be entered as '10:05:15'.

4.5 Run a test

Once a test procedure has been defined, it is possible to run tests on samples. If a test procedure has just been created or edited, it will be available for use. If a new test has been defined or a test has been edited, it must be saved by clicking the "Save Test"

button on the main tool bar or by selecting "File" then "Save Current Test" from the menu. This will ensure that the test is stored ready for recall at a later date.

If previously defined test is to be loaded from disk, click the "Load Test" button on the menu or select "File" then "Load Stored Test" from the menu. The test to be used can then be selected from the list of test profiles. Once the test has been loaded, it is ready to run.

Before running a test, especially if the test samples have been changed it is recommended that the discharge detectors are calibrated. Failure to perform a calibration could result in erroneous or invalid test results being obtained..

The stages of running a test are: Calibrating the detectors Running the test Printing the results

System Operation 29

4.5.1 Calibrating the detectors

Before running a test, each detector to be used for the test should be calibrated. Failure to do so may result in erroneous or invalid measurements. It is the responsibility of the user to ensure that the instruments are correctly calibrated. The calibration procedure must be performed for each instrument in turn. To calibrate a detector, bring its display/control screen to the front. This can be done using the detector select box on the toolbar.

If the detector to be calibrated is shown in the window: , double clicking on the detector name will bring the detector control window to the front and select it. If the required detector is not shown, click the arrow button on the right: this will drop down a list of all the available detectors.

Click on the one to be calibrated to bring its control window to the front and select it. If the controls for the detector are not displayed, click the "Show Controls" button. Calibrating a System with external Calibrator Calibration must be performed using an external calibrator.Two controls are shown in the calibration window:

To perform the calibration, connect an external calibrator across the sample to be measured and switch it on. Ensure that the calibration pulses are clearly visible. If not make appropriate adjustments to the system (The use of auto-ranging is recommended); especially ensure that the system is not over-range. When the reading on the discharge meter has settled (this may take a minute or so if "Slow" mode is being used), enter the value the external calibrator is switched to into the edit box in the bottom box of the screen. (Note - this value must be entered in pico-coulombs). When the value has been entered, press the "Run Calibration" button. Once this has been done, check that the reading on the magnitude meter matches that of the external calibrator - if not repeat the process until adequate agreement between the two is achieved. Calibration validity Once the PD level has been calibrated the Calibration Complete message appears.

30 System Operation

The system may be closed down and restarted with the same setup and the calibration will still be valid even if the Check Detector Calibration message appears.

Changing filter settings or the test setup will invalidate the calibration. The test configuration, the DUT, the filter settings etc. must all be considered before determining that the calibration is valid.

The external calibrator is used to set the discharge magnitude level. For each channel in turn the discharge calibrator is connected across the sample or phase being tested. The calibrator is switched on and the “Run Calibration” button is pressed after the size of the calibration pulse is entered in the edit box. This sets the magnitude meter for that detector from the calibrator. To meet IEC-60270 the reading on the magnitude meter should be within 5% of the nominal value of the reference calibrator.

Calibration to 5% is only guaranteed in a band from 25% to 400% of the nominal calibration value

Calibrating the Voltage Measurement Voltage measurement can only be performed if this function has been enabled from the System properties dialogue. If voltage calibration has not been enabled, the voltage calibration controls will be disabled.

To calibrate the voltage, it is essential that a suitably calibrated reference voltmeter is used. With the detector and the reference voltmeter connected to the HV system apply a voltage and raise it to approximately 50% of full scale on the detector. Select whether the meter is to operate using RMS or Peak measurement by clicking the appropriate button. Enter the voltage read from the reference voltmeter into the edit box and press the “Calibrate Voltage” button. The voltmeter reading should match the reference voltmeter once the calibration has been performed. Verify the calibration at 25% and 75% of full-scale.

WARNING: Due to the fact that this calibration can be accessed and changed by the user, HAEFELY TEST AG takes no responsibility for wrong indication or resulting damages in equipment or DUTs due to wrong handling or calibration of the voltage measurement. Furthermore this voltage measurement is meant to be used for the voltage information to be used in the PD charts and not to control or run the high-voltage system.

Use the calibrated divider and display of the test system as the master voltage indication.

System Operation 31

The external calibrator is used to set the discharge magnitude level. For each channel in turn the discharge calibrator is connected across the sample or phase being tested. The calibrator is switched on and the “Run Calibration” button is pressed after the size of the calibration pulse is entered in the edit box. This sets the magnitude meter for that detector from the calibrator. To meet IEC-60270 the reading on the magnitude meter should be within 5% of the nominal value of the reference calibrator.

Calibration to 5% is only guaranteed in a band from 25% to 400% of the nominal calibration value

32 System Operation

4.5.2 Start the test

Once the detectors have been calibrated, the test can be run. This can be done by pressing the "Run

Test" button on the menu bar. This button will not be enabled until the system has a test procedure loaded, or until the user has edited a test procedure. Alternatively the "Start Test" button on the test control window can be used:

The test control window can be brought to the front of the display by pressing the button on the main toolbar. If there is no test defined the user information fields on the test control window will be blank, and the test status window will show "No Test Loaded". The fields will be displayed according to the setup defined in the test procedure (See Test Information Setup). The contents of these fields can be set up at any time during a test, though a warning will be generated if any are left blank when the test is started. Below the user information fields is a box where the user can enter any comments on the test. These are included at the bottom of the test report when it is generated. Once the test procedure is running, the start buttons are disabled and the stop buttons are enabled. Pressing the stop button will stop the test, and cause the system to request whether it is to generate a test report. The stop buttons are next to the start buttons on both the tool bar and the test control window.

Toolbar Stop Button: Control Window Stop Button:

System Operation 33

During the test, it is possible to take snapshots of the activity on each detector by bringing the appropriate detector window to the front using the selection box on the toolbar and then clicking the “Take Snapshot” button. If a snapshot of the activity on all the detectors being used for the test is to

be taken, click the button on the toolbar. It is also possible to add an additional line onto the results table and additional points onto the graph

using the button.

4.5.3 Running an NQP test

From the General tab of the Setup Test Profile windows select the detectors to be used for the NQP test. Settings on the other tabs are not applicable to NQP tests.

When generating reports the data in the test information fields on the test control form are used. These can be edited at any time and the information will be included on any subsequent NQP report.

34 System Operation

NQP tests are started by pressing the "Start the Analysis" button on the menu bar. As the test is

run charts on the NQP form are updated with live data. Press the “Stop Analysis” button on the toolbar. After the NQP data has been captured it may be filtered for reporting and printing.

4.5.4 Print results

Once the test procedure has completed, a message box is displayed requesting whether a test report is to be generated:

System Operation 35

If the test is to be re-run or the results are to be discarded, click "No". If the results are to be kept, click "Yes", this will generate a test report in the HTML report window, which can be printed out. This can be done by clicking the button on the toolbar, or by selecting the "File" then "Print HTML Report" options from the menu. The user can then select the printer to be used for the report. (If there are problems with the printout, refer to page 13 of this manual :”Installing The Software”). It is also possible to export the results to a comma separated variable file with a .TXT file extension that can be imported into a database or spreadsheet for custom reporting. To do this, select "File" then "Export

Results Table" or click the button on the toolbar.

36 System Control and Settings


5.1 Detector display window

5.1.1 Window Size

The Detector Display window can be shown as a large window or a small window. The small window being useful on multi-phase systems where several Detector Display windows are open at the same time.

The size of the window can be changed by either right clicking on the window or by means of the Small Display tick box that can be found on the Preferences tab of the Display Control window.

5.1.2 Hiding Unused Measurement

The Detector Display window can be set to show both PD and RIV measurements or just PD measurements or just RIV measurements. The Preferences tab of the Display Control window is used to set the visibility of the PD and RIV measurements.

System Control and Settings 37

PD and RIV

PD only

RIV only

5.1.3 Controls

The Detector Display window for each detector shows the partial discharge magnitude, the measured voltage and the RIV level as recorded by that detector. It also shows a copy of the pulse display that is produced by the detector showing the phase resolved discharge activity.


The caption at the top of the window shows the detector name and the connection state of the corresponding detector. For normal operation this will be connected. If the software is trying to establish a connection to a detector, it will indicate “Connecting to <detector name>”. In the event of connection being lost, the caption will read “No DDX-9101/9121 Connected”. If no detector is connected, the voltmeter will read “Use Ext. V/M” to indicate that it is unable to show the current output voltage reading. The PD reading and voltmeter reading are given as both digital and bar-graph readouts. The bar-graph readout is scaled according to the maximum range. For the PD reading this will change according to the amplifier range. The closer the bar is to the maximum, the closer the meter reading is to the limit. If the bar is against the right hand side, the meter is over ranged. The bar is normally coloured blue. When an Over Range condition occurs the bar is coloured red and the red PD Over Range indicator is lit/activated. The RIV reading is given as a digital readout. When an Over Range condition occurs the red RIV Over Range indicator is lit/activated. The yellow Over Limit indicator is visible for PD or RIV readings above the set “failure” threshold.

5.1.4 Setting The Display Shape

The button at the bottom left of the display indicates the currently selected shape for the discharge display. Pressing the button cycles through the available display shape settings. The available settings are: Ellipse - Conventional elliptical display ½ Cycle - The display is shown as a line whose length corresponds to a ½ cycle Full Cycle - The display is shown as a line whose length corresponds to a cycle Divided - As ½ cycle by the positive and negative half cycles are separated Sine - The pulses are displayed on a representation of the mains cycle.

+Ve Zero Crossing

-Ve Zero Crossing

+Ve Zero Crossing

-Ve Zero Crossing

+Ve Zero Crossing

-Ve Zero Crossing

+Ve Zero Crossing

+Ve Zero Crossing

-Ve Zero Crossing

+Ve Zero Crossing

-Ve Zero Crossing

+Ve Zero Crossing

-Ve Zero Crossing

+Ve Zero Crossing


5.1.5 Taking A Snapshot

Left clicking “PD discharge display” stores the current discharge activity display to the snapshots window where it can be incorporated into a test report or transferred to another application. If snapshots of all windows are to be taken, the control on the main toolbar should be used.

5.1.6 Showing and Hiding the Display Controls

Pressing the "Show Controls" button causes the Detector Control window to be restored and become the active window. Pressing the "Hide Controls" button causes the Display Control window to be minimised.

5.1.7 Setting the Synchronisation Source

When the detector is running software version V1.25 or greater, the remote control software can control the synchronisation source used by the detector. It is possible to select either HV synchronisation or Line synchronisation. HV synchronisation is the normal mode of operation of the detector. In this mode, if a valid frequency reference is detected on the voltmeter input, the detector synchronises to that. If there is not a valid frequency reference, it synchronises to the local mains. If line synchronisation is selected, the unit always synchronises to the local mains - that is to the mains supply powering the unit. The current synchronisation mode is shown on the legend of the voltmeter display thus: Voltage (HV Sync) - the unit will synchronise to the HV signal, if present. Voltage (Line Sync) - the unit will synchronise to the mains line only. The synchronisation source is selected by clicking on the voltmeter legend or the voltmeter readout. The cursor changes to a hand symbol to indicate the correct place to click to change the synchronisation source. If the detector is running a version of software that does not support changing synchronisation, the voltmeter legend reads “Applied Voltage”. If the detector is running a version of software that supports synchronisation switching, but the hardware modifications have not been installed, the system will always operate in HV synchronisation mode, irrespective of the displayed selection.

5.2 Detector control window

5.2.1 Available Controls

The format of the display depends on the features available in the detector. Calibrator and RIV controls will be hidden or unavailable if these features are not fitted in the detector. Available controls are grouped together as PD Controls, RIV Controls and Preferences.


5.2.2 Communications Status Indication

At the lower right of the Detector Control window is the communications status indicator. This should be flickering between a green ‘T’ on a red background and a red ‘R’ on a green background showing when the remote control software is transmitting data to the detector and receiving data from it. If this stops flickering between the two states, there has been an interruption of communications. If the communications between the remote control software and the detector become disrupted and the connection is lost, the software will automatically try to reconnect to the detector. Communication messages and the version of detector firmware are shown at the bottom of the Display Control window.

5.3 Detector PD control window

5.3.1 Controlling the PD Amplifier

The PD amplifier controls are shown above. Amplifier gains are automatically set by the detector. The low pass and high pass filter settings of the detector are selected by clicking the “Low Pass Filter” and “High Pass Filter” buttons. The caption on the button indicates the currently selected filter setting.


Some systems are built-in with predefined hardware filters and for such systems, the software screen may look like the one shown below.

If the test system is subject to short bursts of transients, setting the PD meter to “Slow mode” can help to alleviate the problems. If the box is checked, slow mode is enabled and the system is less responsive to changes in the PD level.

5.3.2 Controlling the Gates

The controls for the gating system are shown above. The width (i.e. the proportion of the cycle that is not measured for PD magnitude) of the gate is set in degrees using the “Gate width” slider. If a single gate is selected, the width can be between 0 and 359 degrees. If dual gate is selected, the width is between 0 and 179 degrees. The position of the gate on the HV cycle is likewise set using the Gate Position slider. Again the limits depend on whether single gate or dual gate is selected. For single gate the range is 0 to 359 degrees, for dual gate the range is 0 to 179 degrees. The gate mode is selected using the radio button on the right. Clicking the appropriate button sets the gates to off, single or dual. When gates are activated, the gated out section of the HV cycle is shown on the pulse display in red. Please take note that IEC standard on PD measurement (600270) doesn’t allow signal gating more than 10% of each test voltage period (i.e. roughly 36°).

5.3.3 Voltage Calibration Controls

The voltage calibration controls allow the user to change the voltage calibration of the detectors if required. For instance if the system is being used to measure transformers where the PD signal is taken from a bushing tap, the divider capacitance may vary from transformer to transformer. In this case it is necessary to re-calibrate the voltage against a reference voltmeter before each test. The voltage calibration controls are only enabled when the Allow Voltage Calibration option is set. This is normally not the case and these controls are disabled by default. If the voltage calibration


controls are disabled, they can be enable by selecting the option System Properties from Setup System Properties, check the box gain the label – “Allow Voltage Cal” and type-in this password 35421 and click Ok to the box that pops-up.

Calibration is performed by selecting whether to use RMS or Peak measurement, entering the value of the applied voltage into the edit box and clicking the “Calibrate (RMS)” button to calibrate and use RMS measurement or “Calibrate (Peak Mode)” to calibrate and use Peak measurement.

5.3.4 Capture Controls

The capture controls allow the user to adjust the effective update rate of the display. Increasing the number of cycles to display increases the effective persistence of the display, but reduces the update rate. A value between 1 and 10 gives the best results, though the actual value used will depend on personal preference to some extent. The capture rate is set by adjusting the required number of cycles using the up and down buttons and then clicking the “Set” button. This will set the new update rate. If the number of cycles is being increased, there may be some disruption of the display as the memory on the capture board is reallocated and re-filled with data, but this only lasts for one capture cycle.


5.4 Detector RIV control window

Depending on the type of RIV calibration choosen in the <System Properties>, the RIV control window will have one of the two forms below. The one on the left is when the hand-held 9220A is chosen and the one on the right is when KAL 9530 is chosen.

5.4.1 RIV Controls

The measurement frequency is the center frequency of the RIV measurement, it must be set at the same frequency as the RIV calibration frequency. When using the default frequency for RIV measurement (1000kHz), RIV calibrator and RIV measurement frequency must be set to 1MHz. The RIV bandwidth can be set to 4.5 kHz or 9 kHz. RIV measurements are mostly required for the US market, in that case select 4.5 kHz which will give the same reading as commonly used old RIV meters (Stoddart). The RIV attenuator (0-35dB) should be set to 0dB using the up down arrows. In case of RIV input staturation as shown in the detector display window attenuation should be increased (in 5dB steps) until the over range saturation message disappears.


5.4.2 RIV Frequency Scan

The Scan button starts a frequency scan in the selected range to check that the RIV selected frequency is not perturbated by AM radio emitter. Once you have selected the RIV measurement frequency we recommend to scan in the +/-20kHz range. The RIV frequency should be at leat 10kHz (4.5kHz filter) or 20kHz (9 kHz) away from any emitter or noise, as shown in the following examples:


5.4.3 RIV calibration

5.4.4 Using hand-held calibrator 9220A

If you are using a hand-held calibrator like that of Tettex 9220a, enter the RIV level injected in micro-volts into the <Injected Level> edit box and press the button <Calibrate>The current RIV level is then rescaled to the entered value.

5.4.5 Using KAL 9530.

This procedure is as per the calibration and measurement procedure described in the NEMA publication 107-1987, which is the defacto standard in the industry for RIV measurements on high voltage apparatus. This method requires establishing a <Circuit RIV Factor> by measuring the ratio of the voltage at the input of the RIV meter to the signal generator voltage. In the case of transformer testing, this would be the ratio of the signal measured at the bushing test tap (low-voltage end of the coupling capacitor) to the signal injected (from the signal generator) to the HV terminal of the bushing. First chose a noise free frequency to use for RIV measurement, by using the method outlined in 5.4.2. For power transformer testing it should be between 0.85 and 1.15 MHz. The general industry practice is to use 1MHz, unless there is a strong-interference signal at this frequency (for example, a local radio station).

5.4.6 Calibration of the reference Channel

If you have a single-channel system, then it serves as both the reference and measurement channel. If you have a multi-channel system, then you define one has the reference and the rest as the measurement channel (see section 5.4.5.3) This step is required to be performed only during commissioning of the system and when the test environment temperature is significantly different to the one during the commissioning. RIV board calibration accuracy falls due to temperature drift by 0.04 dB /°C. To calibrate the reference channel, follow these steps in sequence. Set the switch on the KAL 9530 (front panel) to - <Adjust reference> On the remote software (SW), select the device control window RIV Controls check the box - <Enable Recalibration of Reference Channel>. Connect 60dB at the output of generator (see figure 6 below) Set generator (Agilent 33210A) to Sinewave / 1MHz/100mVrms (frequency can be chosen from 850kHz to 1150kHz) Disconnect the cable labeled <reference> from the <RIV calibration Set> and connect it to the open end of the 60dB attenuator (the other end of this cable is connected to the output of the Agilent generator) Calibrate Reference channel to 100uV


DDX9121a

PD/RIV

Voltage

Generator Adjust Ref.

PD/RIV

Voltage Meas.

60dB

100uV 20dB

Reference

Refere

Reference

Twin coax cable

Figure 6: Schematic for Calibrating the Reference Channel.

5.4.7 Calibration of the measurement Channel

This procedure has to be done before every test or essentially when there is a change in the test object / test arrangement. This procedure is explained assuming that the test object is a power transformer with bushing test-tap. If you use an external coupling capacitor, like for distribution transformer testing, then substiture the term - <bushing test-tap> by the term -<low voltage output of


the coupling capacitor>. Please ensure that the checkbox against the label - <Enable recalibration of Reference Channel> is unchecked, before you begin with the steps below.

5.4.7.1.1 Calibration of the measurement channel – Step 1 of 2.

With reference to the figure 7 below. Adjust calibration voltage injected at the bushing terminal to 100uVrms Connect <RIV cal set> to the bushing Set the switch on the calibrator KAL 9530 to <Adjust Reference> On the remote SW select - <Adjust Reference> Set the generator (Agilent 33210A) to Sinewave / 1MHz and press the soft key - <Output>. Change the generator voltage starting from 100mVrms to get 100uV reading on the reference channel. An attenuator in the <RIV cal set> drops down the voltage from mV to uV. If you cannot get exactly 100uV, try to get a value as close as possible to 100uV and software will record the displayed value. Press the button labeled <Adjust> to complete this step.

Sample

Under Test

AQS9110a

PD

Voltage

DDX9121a

PD/RIV

Voltage

Ck

Generator Ref

PD/RIV

Voltage

Meas

100uV

~100mV

RIV calibration set

Ca Ck

AQS

20dB 40dB

OR

20dB Voltage

Generator

Referenc e

Generator

Twin coax cable

Twin coax cable

PD /RIV

PD/RIV

Voltage

Figure 7: Connection Diagram for calibrating the measuring channel – Step 1 of 2.


5.4.7.1.2 Calibration of the measurement channel – Step 2 of 2.

With reference to the figure 8 below. Set the switch on the KAL 9530 (front panel) to <Measurement>. On the remote SW select <Measurement>. Press the button labeled <Calibrate> to complete this step. You should now see the RIV value displayed by the DDX display, equal to the set reference RIV level.


Sample

Under Test

AQS9110a

PD

Voltage

DDX9121a

PD/RIV

Voltage

Ck

Generator Ref

PD/RIV

Voltage Meas

100uV

~100mV

RIV calibration set

20dB 40dB

20dB

Figure 8: Connection Diagram for calibrating the measuring channel – Step 2 of 2.


Remove the RIV calibration set (see figure 9 below), before you start the HV Tests.


Sample

Under Test

AQS9110a

PD

Voltage

DDX9121a

PD/RIV

Voltage

Ck

Generator Ref

PD/RIV

Voltage Meas

RIV calibration set

Fig. 9: Connection diagram of the system prepared for RIV measurements.


5.4.8 Calibration of a multiple channel system.

For multiple channel system, chose one of the multiple system as the reference (see section 5.5) and follow the procedure outlined in section 5.4.5.1. Once the reference channel is calibrated just move the <calibration set> to the other channel as shown in the figure 10 below. The switch on the KAL 9530 should remain fixed at <Adjust Reference> throughout the calibration procedure.

Sample

Under Test

AQS9110a

PD

Voltage

DDX9121a Channel 1

PD/RIV

Voltage

Ck

Generator Ref

PD/RIV

Voltage Meas

100uV

~100mV

RIV calibration set

20dB 40dB

20dB

DDX9121a Channel 2

PD/RIV

Voltage

AQS9110a

PD

Voltage Ck

DDX9121a Channel N

PD/RIV

Voltage

Remove the RIV calibration set (see figure 9 below), before you start the HV Tests.


5.4.9 Calibration of a single channel system with MUX option.

In a single channel system with MUX option, there is only a single DDX 9121a channel with a multiplexed input. Multiplexer is essentially a switch (in our case, manual operation) that as multiple input, but only one single output. For example, PD/RIV signals can be tapped from multiple bushing test-taps and the multiplexer (manual switch) decides which input signal is used in DDX 9121a for measurements. RIV calibration is comprised of two steps. The first step is to perform the steps outlined in section 5.4.5.1, which is about calibrating the reference channel. For a single-channel system with MUX option, the one available channel serves as both the reference and measurement channel. The second step is calibration of the measurement channel (let’s say the input corresponding to the manual switch position 1) as outlined in section 5.4.5.2. Once this is completed, switch the multiplexer to next position (Let say, 2 ) and ove the RIV calibration set to the bushing terminal, whose output is connected to this multiplexer position(say, 2).

Sample

Under Test

AQS9110a

PD

Voltage

DDX9121a

PD/RIV

Voltage

Ck

KAL9530 Generator Ref

PD/RIV

Voltage Meas

100uV

~100mV

RIV calibration set

20dB 40dB

20dB

DDX9106a MUX

AQS9110a

PD

Voltage Ck

PD/RIV

Voltage

1 2 3


Once this is completed, switch the multiplexer to next position (Let say, 3 ) and ove the RIV calibration set to the bushing terminal, whose output is connected to this multiplexer position(say, 3). Cycle through this procedure for all the remaining multiplexer positions.

5.5 Detector control window preferences

5.5.1 Display Measurement Type

The Display Measurement Type options are used for setting the visibility of the PD and RIV measurements shown on the Detector Display window. See the section Detector Display Window -> Hiding Unused Measurement

5.5.2 Display Size

The Display Size option can be used for setting the size of the Detector Display Window. See the section Detector Display Window -> Hiding Unused Measurement

5.5.3 Save And Restore settings

The Save and Restore Settings allow the detectors current settings, including calibration values, to be saved or for previously saved settings to be restored. When restoring settings care must be taken that the


calibration and configuration is valid. The saved and restored settings are for the detector associated with the active Detector Control window and not for all of the system. The Settings dialogue is shown when the Settings button is pressed. At the top of the dialogue a list of saved settings is shown. The date column shows when the settings were saved. A description of the highlighted settings is shown below the list in the description window.

To save the current configuration press the “Save As...” button. The Save Settings dialogue is shown below.

Enter a Name and Description for the settings. Press Save to save the settings. Enter the same name as an existing set of settings to overwrite them. To delete a set of settings highlight the entry in the list and press the Delete button. To restore a set of settings highlight the entry in the list an press the Restore button.


5.6 NQP Analysis Module

The NQP Analysis module provides a plot of N-Q-P (frequency of occurrence against magnitude and phase). The data can be shown on a 2D or 3D chart. Data is captured in blocks. The captured data can be saved to a file. The saved data can be viewed later. Additionally a comparison can be made between the saved data and current captured data.

5.6.1 Tool bars

The main menu tool bar provide access to the commands available from the NQP analysis window. Frequently used commands are also available via other tool bars buttons.

5.6.2 Data Properties Panel

The data properties panels show information about the parameters used to capture the data.

5.6.3 File Commands

Command Description

Open Analysis Result Opens for viewing a saved set of captured NQP data

Save Analysis Result Saves the current captured set of NQP data

Copy Chart to Clipboard Copies the current chart to the clipboard as an image

Print NQP Chart Prints the current chart.

Generate/View Report Generate and show an analysis report in a separate window. .

5.6.4 Display Commands

Command Description

Display DDX Displays the data captured from the detector.

Display File Displays data loaded from a file.

Display Difference Displays the difference between the data captured from the DDX9121a and the

data loaded from the file. Note. It is recommended to keep the number of data

blocks captured by the detector and those in the file compared the same.

2D plot Display 2D plot

3D plot Display 3D plot.


5.6.5 View Commands

Command Description

Zoom In Zoom in on the chart

Zoom Out Zoom out on the chart

Zoom All Show all the chart

Zoom Window Drag a window to zoom in or out. Dragging a window from right to left zooms in.

Dragging a window from left to right operates the same as Zoom All.

Scroll Enables the scrolling of the chart. Position the cursor over the chart. Click and

hold to drag the chart.

Rotate Enables the rotation of the 3D chart. Position the cursor over the chart. Click

and hold to rotate the view of the chart. Moving the cursor up and down rotates

the chart about a horizontal axis. Moving the cursor left and right rotates the

chart about a vertical axis.

Reset Rotate Reset the rotation to the default orientation.

Display Default Orientation Reset the rotation to the default orientation and zoom-out any zoomed-in data.

Hide Info Panel Hides the information panel on the right side of the NQP chart.

5.6.6 Procedure for doing an analysis

Make sure at least one detector is connected and selected for use. To select or deselect a detector, go to the main window File Edit Test select / deselect the detector to use. Do the calibration, using Run Calibration button on the “PD Controls” tab. Start the analysis using the start button on the main window. Wait for the required blocks to be captured. Stop the analysis using the start button. An example of the NQP display alongside the classical display is shown below.


5.6.7 Detector Panel

The detector panel shows information about the captured data.

5.6.8 File Panel

The File panel shows information about the data loaded from file. The data properties show the setting used when the data was captured.


5.6.9 Filter Controls

After data has been captured filters can be applied to view data sliced over several time intervals. The filter threshold bar can be adjusted to suppress display of signals below the set threshold level.

Fig 1. Data display with no filter threshold set (default Fig 2 Data display with filter threshold set to 1pC. threshold is 0 pC). (All pulses below 1pC are suppressed).

5.6.10 Time Spliced Data Displays

The data recorded can be split into several time frames and pattern in each time frame can be either displayed or subjected to further analysis. Use the Display Control spin edit to select a time frame, which is defined in terms of data blocks. Figures 2 to 4 graphically illustrates how time filters can be used as a tool to identify PD (Fig. 3) and noise pattern (Fig 4) from a fixed duration data-acquisition (Fig. 2). Fig. 3: Time sliced view. (first 5s of data recorded) Fig 4: Time sliced view (next 2s of recorded data) Simulated PD signals (approx. 2pC) Intermittent noise interference with dominant amplitude at 20pC.


5.6.11 Other Displays

NQP module allows real-time display of difference of data being captured against previously recorded or file data. In the example below, it is graphically illustrated how such a display in certain cases can help in separating out the PD and noise patterns of approximately the same amplitude. This works best if the PD pattern is more or less stable between the two time frames compared. Figure 5a, displays the data being captured by the hardware and for this case, the PD capture is corrupted by a noise interference of approximately the same amplitude. Figure 5b, is a file record and for this case, the PD capture was free from noise interference. Figure 5c, is a real time display of data in figures 5a and 5b and essentially allows the user to view the complete data (Fig 5a) and noise pattern (Fig. 5c) simultaneously.

Fig 5a. Simulation of PD and noise level of approximately same level (here, 2pC).

Fig 5b. File display of a previous PD alone

File Display

Display of data in the hardware

Fig 5c. Difference of Hardware and File data. Noise signal is clearly seen separated out.

Difference


5.7 Set system properties

The system properties are set up using the System Properties dialogue box. This is selected from the menu by selecting "Setup" then "Set System Properties".

Any changes made to the settings are stored by clicking "OK" and will be used next time the system is run. To make the changes current, close the system dialogue properties box with "OK" then close the application. The new settings will be applied when the application is restarted.

5.7.1 Allow Voltage Cal

The “Allow Voltage Cal” checkbox enables or disables the voltage calibration controls in the detector control window. If the box is checked it is possible to recalibrate the voltage. If the box is unchecked, recalibration of the voltage is not possible. The check box is normally disabled. To enable it, the password has to be entered into the password edit box. The fixed password is 35421. As soon as the password has been correctly entered, the check box is enabled and can be changed. It will be disabled as soon as the text in the password entry box is changed, or when the dialogue box is exited.

5.7.2 Snapshot Image Size

The snapshot image size determines the dimensions of the image used for snapshots. The required size in pixels for the width and height are entered into the edit boxes. The larger the size entered, the more memory it will consume.

5.7.3 File Paths

The File Paths set the default locations for the storage of test profiles and results. These must point to valid and accessible paths, though they can be on network drives or an external server if required. The paths should be set so the application can write to them as well as read from them. This is particularly important for the Report Files, which are generated automatically with no option to relocate them within the program.


5.7.4 Enable Detector Settings Save

The Enable Detector Settings Save checkbox shows/hides the Save and restore settings controls on the Preferences tab of the Detector Control window.

Report 63

6 Report

The software produces data that can be used to generate test reports or export the data to other applications for more detailed analysis or to build a measurement database. The system produces three types of data report: HTML report of discharge activity. This is a test report for the sample under test detailing the test performed and the results. It is intended for printing to provide a permanent record of test Tabular Results. The tabular results table is used as part of the HTML report. It can also be exported to a spreadsheet or database for analysis by an external system. Snapshots. A snapshot gives an instantaneous picture of the discharge activity on a particular detector. It shows the activity on the display as well as the PD and voltage. The snap shot of the activity can be copied to the clipboard for transfer into a document or report.

6.1 HTML report

At the end of a test the system produces a test report whose format is determined by the test setup (See Test Setup - HTML Report) is generated. This report is stored automatically into the directory set for data storage. This is set on installation of the program or it can be reset using the Set System Properties dialogue box. If tabular data is shown on the test report, any discharge reading that was over the threshold set for that detector are displayed in red to warn the user that they were over threshold. All other readings are displayed in black. The test report consists of a number of files, all sharing a common root filename of the form "Test_hh-mm-ss_yyyy-mm-dd" where "hh-mm-dd" indicates the time at which the test report was generated (the end time of the test" and "yyyy-mm-dd" indicates the date on which the test report was generated. So for example a root filename of "Test_10-05-11_2002-01-06" indicates a test report generated at five past ten (plus 11 seconds) on the sixth of January 2002. The main report file will have a name of the form: Test_hh-mm-ss_yyyy-mm-dd.HTML This can be displayed by opening the file using any web browser compatible with HTML 4.0. If the test profile calls for the report to display graphs, the graphs shown on the results window are stored as JPEG files with the names: Test_hh-mm-ss_yyyy-mm-ddPD.JPG for the discharge graph Test_hh-mm-ss_yyyy-mm-ddV.JPG for the voltage graph If any snapshots were taken during the course of the test, these are also stored as JPEG files with the names Test_hh-mm-ss_yyyy-mm-ddSnapshot0.JPG Test_hh-mm-ss_yyyy-mm-ddSnapshot1.JPG Test_hh-mm-ss_yyyy-mm-ddSnapshot2.JPG. There will be as many snapshot JPEG files as there were snapshots taken during the test. If the test report is to be moved to another location, all the files with the same root filename must be copied to the same directory, otherwise it will not be possible to reproduce the test report correctly.

64 Report

6.2 Tabular results

When a test has finished, the tabular results on the test report form can be exported as a text file that can be imported into a spreadsheet, database or other external package. The data is stored as ASCII test in a tab delimited format.

To generate a tabular result file click the export button on the toolbar or select "File" then "Export Results Table" from the menu. This displays a dialogue box that allows the name and location of the file to be set. Once the dialogue box has closed, the file is written and can be accessed from other packages. The format of the test report is determined by the test setup used to gather the data. The data in the results table is exported along with the user information fields defined for the test and the date and time of the test. Note: when the system is recording partial discharge levels, any results that exceed the failure threshold set for that detector will be recorded with a prefix – “+”, so they can be picked out from the test record without having to know exactly what failure threshold was set.

6.3 Snapshot

The system allows the user to take snapshots of the discharge activity as displayed on the detector screen. This can be done whether a test is running or not. Any snapshots taken while a test is not running will be deleted as soon as a test is started. There are two ways of taking a snapshot. A snapshot can be taken for an individual detector by clicking

the "Take Snapshot" button. Alternatively, clicking the button on the toolbar will take a snapshot of all the detectors connected to the system, or selected for the current test (which depends on whether the test is running or not). The snapshots that have been taken can be viewed by bringing the Snapshot

display window to the front. This is done by clicking the "Show Snapshots" button , which brings the snapshot window to the front:

Report 65

This shows all the snapshots that have been gathered. Below the snapshot image, the number of snapshots gathered and the details of this snapshot are shown. To view the different snapshots, press the "Next" and "Prev." buttons to move through the list. "Next" is disabled when the end of the list is reached. "Prev." is disabled when the start of the list is reached. Both buttons will be disabled if there is only one snapshot in the list. If a snapshot is not required in the list, it can be removed using the "Delete" button. This removes the currently displayed snapshot from the list. To export the currently displayed snapshot, double click on the PD display image; this will transfer it to the Windows clipboard. It can then be transferred to another application as a bitmap. The size of the snapshots taken can be adjusted using the System Properties dialogue. If the snapshot size is changed, the new size will not be used until the next time the software is run.

66 DDX with MUX option


7.1 Structure of a Multiplexer

A schematic representation of DDX 9121a with 3 MUX position is shown below-

7.2 Configuring the detectors

7.2.1 Configuring the DDX 9121a detector

DDX 9121a detectors with a MUX option is factory configured depending on the number of channels to multiplex and no action is required by the user and ready for use by the user. In the case, where the user uses is own PC to set up the DDX 9121a, the option to select the MUX option and as well to define the number of MUX inputs is defined in the System Properties window.

DDX 9106a [Multiplexer]

DDX 9121a

[PD Detector]

AKVAKV

AKV

MUX=1 MUX=2 MUX=3

PD, Voltage Signal

DDX with MUX option 67

7.3 Installing the remote software

The installation procedure is similar to the one described in section 3.7 with some minor differences. For the sake of completeness, the entire process is described below. To install the software, place the CD into the CD-ROM drive. The setup application should run automatically. If it does not run "Setup.exe" from the CD-ROM, click on the file – Setup.exe to start the software installation process.

The installation process is largely automatic - unless specific options are required for the location of files, allow the process to run automatically. If there is a problem during installation, or you wish to customise the installation, refer to the setup notes below. For printing it is necessary to set up the margins. This has to be done from within "Internet Explorer". Start Internet Explorer and select "Page Setup". In this window select the margins and set the left and right margins to the smallest possible amount that is supported by the printer. This will ensure that the test report does not overflow the limits of the page.

7.4 Starting the remote software

After installation of the 9101 remote software an Icon will appear on the desktop. Double click on this Icon to start the software.


Before the software can run tests, the detectors that it is to be used must be registered in the software.

To register detectors with the software, ensure that the PC and the detector is connected to the network. Switch on the detectors and wait for the start-up to finish. Once the the detector is running, start the software in Windows and choose from the menu on the PC software "Setup" then "Select Detectors…". This will display the following dialogue box (for 3 channel MUX option).

Use This Detector indicates whether this detector is to be used with this machine. The check-box should always be set for the DDX 9121a with MUX option.

System ID (Machine ID) is the unique identification code set in the DDX-9101 configuration (See "Configuring the DDX-9101 Detectors").

Current IP displays the current IP address of the detector. If fixed IP addressing is used, this value will only vary if it is changed on the detector. If DHCP address allocation is used, this value may change frequently.

Current State displays if the detector is connected to the PC or not.

System Name allows the user to enter the title, which will be displayed by the software to identify the detector on test reports, snapshots and result files. This should not be too long, but it should be a meaningful description of the detector and its location/function.

Graph Trace Colours

Use this option to define the colours to be used for drawing the PD and voltage traces on the test result and report graphs. To change the colour, clicking on the coloured rectangle shows the colour selection dialogue box.


Select the colour to be used for the trace by clicking on the appropriately coloured square. Click OK to close the box and update the colour of the trace. If a colour not shown in the squares is required, clicking on "Define Custom Colours" allows a colour to be selected from a far wider range.

An example is shown below.

Once all the MUX positions have been selected and set-up, the changes are saved by clicking OK.


Note: When the system is being set-up for the first time, the system may report errors when the “select detectors” dialogue box is closed. This is because the system goes through an indeterminate state. Close the application and restart it before attempting to perform any tests.

7.5 Display Control

To flip between different multiplexed channels, use the Test Control window. Test Control window display can be brought to the foreground by choosing the “Test Control” window option on the tool var (section 4.3.1). An example case with 3 channel MUX is shown below. In this example, the multiplexer position 1 has been selected.

The switch position on DDX 9106a should also be set to position 1 (see below).

9106a with 3 switch positions

7.6 Calibration

Before the multiplexed inputs can be used, they should be calibrated for both PD, RIV and voltage. First select the switch position to 1 on the DDX 9106a and in the test control window of the software set the MUX position to 1. The procedure for PD and voltage calibration is same as the one described in section 4.5.1 and RIV calibration is same as the one described in section 5.4.

When PD, RIV and voltage calibration of MUX position 1 is completed, select the next multiplexer position (switch position 2 on DDX 9106a and MUX=2 in the test control window of the software) and perform the PD, voltage and RIV calibration as before. Repeat the above procedure for the remaining multiplexer positions.


7.7 Running a Test

Once all the multiplexed inputs have been calibrated, the test can be run. This can be done by pressing

the "Run Test" button on the menu bar. This button will not be enabled until the system has a test procedure loaded, or until the user has edited a test procedure. Alternatively the "Start Test" button on the test control window can be used.

The user can choose to record a different MUX position input by selecting the appropriate switch on the DDX 9106a and the “MUX Channel Position” setting in the test control window of the software.

For example, to record data from MUX position 2, set the switch on the DDX 9106a unit to position 2 and in the Test control window, set the MUX Channel Position to 2.

72 DC PD Testing

8 DC PD Testing

8.1 Unlocking the DC PD Test Module

To unlock the DC PD test module, you need an unlock code. If you purchased a notebook or PCI PC with DDX 9121a, then the unlock code is preset in the software and you don’t have to do anything.

If you either use your own PC to run the DDX remote software or desire to enable the DC option on an existing DDX system, then you need a unlock code. Please contact Tettex after-sales for the unlock code with the <PC Code>. To find out the PC code applicable to your system, go to Main Menu Setup System Properties. A dialog box with <System Properties> header pops-up. The <PC Code> can be found under the header - <DC Testing>. For the case presented below, the <PC Code> is 2483-1676-9812-BCEF-AD78-29A8-F982-336A.

Once you have the Unlock code, type it in the blank field against the label - <Unlock Code>. For this

example, the <Unlock Code> is 4192-C2CE-04A6-77DE-D78A-A6A0-05F3-A8CD-ADCE.

DC PD Testing 73

START the DC

To SETUP the Detectors for DC Testing

STOP the DC Test

Once the correct <Unlock code> is given, the DC PD testing module is unlocked and this is figuratively indicated by an <Unlocked Icon>. Change the Test Mode to DC Testing as shown above.

8.2 DC Tool Box

The DC PD testing tool box and the functions of the individual menu is figuratively indicated below.

74 DC PD Testing

8.3 Performing the DC Test

8.3.1 Defining the parameters for the DC Test

The first step is to define the detectors to use for the DC PD testing. To do this, click on the icon - A dialog box with the header - < Setup DC Test> pops-up.

In the example shown, only one detector was available and moved to the white field under the header - <Detectors to use>. The detector in this example uses its own PD address as its identification tag; For your case, it can have a different identification convention or tag name. If you have a multi-channel system, move the desired set of detectors to the white field under the header <Detectors to Use> by using the arrow keys. To automatically stop the test after a preset time interval is elapsed, type in a value against the field labeled -<Test Duration>. If the user desires a manual control, check the box against the header - <User halts test>. This allows to manually halt the test, once the test has been started. The field <Threshold>, allows to reject using all PD pulse amplitudes below the set value. For transformer DC PD testing as per IEC 600076, PD pulses above 2nC are counted. Refer to the relevant standard for more information. Once the parameters for the DC testing has been defined, press the <OK> button to complete this process.

8.3.2 Starting and stopping the test

To start and stop the test, use the following icons respectively

To start the test

To stop the test.

8.4 Overview of the PD acceptance limits specified in the IEC Standards

The Tables 1 and 2 below gives an overview of the PD acceptance limits specified in the relevant IEC standards for DC PD testing of HV bushings, converter transformers, smoothing-reactors, thyristor valves and voltage-sourced converters. The information presented herein is only to indicate the general testing trends and shouldn’t be used as an absolute reference.

DC PD Testing 75

Table 1: DC PD Test Acceptance Limits

Table 2: DC PD Test Acceptance Limits for Thyristor Valves and Voltage-sourced Converters

8.5 Display and Analysis of the Results.

The software offers several displays of the acquired data, which are explained below. The views can be used to evaluate the test results as per the PD acceptance limits defined in the standards (also see Table 1 and Table 2).

76 DC PD Testing

8.5.1 Q versus T Scatter Plot

This is the base plot, showing the base or raw data.

DC PD Testing 77

8.5.2 Accumulate Charge versus Time

The pulse count at any time instant (Ti) is the cumulative sum of all the pulses before that time instant (T1+T2+T3 …+ Ti-1) plus the pulse count at Ti. Take note that all pulses above or equal to the defined threshold is alone used. For the data presented in 9.5.1, the graph of accumulated charge versus time is shown below. The setting used to generate data is also shown.

78 DC PD Testing

8.5.3 Count > Charge

This graph counts all the pulses greater than (“>”) or greater than or equal to (“>”) the values set under the field - <Lower Limit>. The lower limits shown below are only for illustrative purposes and the user is encouraged to define his own limits, based on his or her test requirements (See also Table 1 and Table 2) For the data presented in 9.5.1, the graph of Count > Charge is shown below. The setting used to generate data is also shown.

DC PD Testing 79

8.5.4 Count in Band

This graph counts all the pulses within the <Lower Limit> and <Upper Limit> bands. The limits shown below are only for illustrative purposes and the user is encouraged to define his own limits, based on his or her test requirements ((See also Table 1 and Table 2) For the data presented in 9.5.1, the graph of Count in band is shown below. The setting used to generate data is also shown.

80 DC PD Testing

8.5.5 Pulse rate vs Time

This graph uses the pulse count acquired during the time-interval (in the case below, 2min) to generate the pulse rate. The time-interval is positioned at 1 minute steps. Take note that all pulses above or equal to the defined threshold is alone used. For the data presented in 9.5.1, the graph of pulse rate vs time is shown below. The setting used to generate data is also shown.

DC PD Testing 81

8.5.6 Pulse rate in Band

This graph uses the pulse count acquired during the time-interval (in the case below, 2min) to generate the pulse rate in band. If the pulse count is within the defined limits, they are shown as blue rectangular bars and if found outside the defined limits, they are shown as red rectangular bars. The defined limits are shown as green rectangular bars. For the data presented in 9.5.1, the graph of pulse rate in band vs time is shown below. The setting used to generate data is also shown.

82 DC PD Testing

Report Generator

8.6 Data Export, Printing and Reporting

8.7 The tools for data export, printing and reporting is available in all the graph displays and these tools are identified by the following icons.

8.8

8.8.1 Report Generator

To generate a report, double click on the <Report Generator> icon and in the dialog box that pops-up choose the plots to include and if you desire, give a different name to the report or remain with the default name (generated automatically) and press the button - <Create Report>.

An example of the generated report, with the chosen field is show below.

Copy to Clipboard

Print Graph

DC PD Testing 83

Date : 15.10.2012

Type Number : TE-Messgerät

Batch Number : 021-235

Serial Number : 4841988

Works Order : Demo

Customer : ABC Company

Operator : R. Kuppuswamy

Comments

Tested By : R. Kuppuswamy

Shift Manager :

Engineer :

Inspector :

Detector Settings : 192.168.0.106: PD Low pass filter = 500kHz PD High pass filter = 30kHz

84 DC PD Testing

8.8.2 Copy to Clipboard

To copy an image to the windows clipboard, double-click on the icon - <Copy to Clipboard>. The image is then transferred to the clipboard and is available for use in any other application that is capable of accessing windows clipboard (For example, Microsoft Word document).

8.8.3 Print Graph

If a printer is connected to the DDX 9121a unit and appropriate driver files installed, then the selected graph is printed, upon double-clicking on the icon - <Print Graph>.

Miscellaneous 85

9 Miscellaneous

9.1 Miscellaneous

9.2 Care and Maintenance

The DDX 9121a instrument is basically service free, as long as the specified environmental conditions are adhered to. As a result, service and maintenance is restricted to cleaning of the equipment and calibration at intervals stipulated by the application for which the instrument is used.

The insulation of all cables should be periodically checked for damage. If any damage to the insulation is detected then a new measuring cable should be ordered from HAEFELY TEST AG.

9.3 Instrument Calibration

When delivered new from the factory, the instrument is calibrated in accordance with the calibration report provided. A periodical calibration of the instrument every two years is recommended.

As the calibration process is fairly extensive, the instrument can only be calibrated and, if necessary, adjusted at HAEFELY TEST AG’s factory. An updated calibration report will then be issued.

9.4 Changing Fuses

Before changing the mains fuse, remove the mains power cord. Fuses should only be replaced with the same type and value.

9.5 Instrument Storage

If the instrument is to remain unused for any length of time, it is recommended to unplug the mains lead. In addition, it is advisable to protect this high precision instrument from moisture and accumulation of dust and dirt with a suitable covering.

9.6 Packing and Transport

The packing of the DDX 9121a instrument provides satisfactory protection for normal transport conditions. Nevertheless, care should be taken when transporting the instrument. If return of the instrument is necessary, and the original packing crate is no longer available, then packing of an equivalent standard or better should be used.

Whenever possible protect the instrument from mechanical damage during transport with padding. Mark the container with the pictogram symbols „Fragile“ and „Protect from moisture“.

Figure :6

Figure :7

Figure :8

Figure :9

86 Miscellaneous

9.7 Recycling

When the instrument reaches the end of its working life it can, if required, be disassembled and recycled. No special instructions are necessary for dismantling.

The instrument is constructed of metal parts (mostly aluminum) and synthetic materials. The various component parts can be separated and recycled, or disposed of in accordance with the associated local rules and regulations.

9.8 Customer Support

All error messages appear in the remote software of the DDX 9121a instrument. If persistent problems or faulty operation should occur then please contact the Customer Support Department of HAEFELY TEST AG or your local agent.

The Customer Support Department can be reached at the following address:

HAEFELY TEST AG

Customer Service - Tettex

Birsstrasse 300

CH-4052 Basel

Switzerland

Tel: +41 61 373 4422

Fax: +41 61 373 4914

e-mail: [email protected]

We prefer contact via email. Then the case is documented and traceable. Also the time zone problems and occupied telephones do not occur.

Remember: Complete information describing the problem clearly (Debug Report, printouts, firmware version, DUT type, etc.) helps us to help you.

Declaration of Conformity 87

10 Declaration of Conformity

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