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Presentation on VLF by HVDSA

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VLF Testing of cable
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High Voltage Diagnostics Sarl 4, Rue de Lac CH 1897 Le Bouveret Switzerland
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Page 1: Presentation on VLF by HVDSA

High Voltage Diagnostics Sarl

4, Rue de Lac

CH 1897 Le Bouveret

Switzerland

Page 2: Presentation on VLF by HVDSA

Company

HV Diagnostics Sarl is a Swiss based company in

the field of high voltage test equipment for

cable testing and diagnosis.cable testing and diagnosis.

HIGH VOLTAGE DIAGNOSTICS SARL

Page 3: Presentation on VLF by HVDSA

Company

AUSTRIAFactory in A

HIGH VOLTAGE DIAGNOSTICS SARL

SWITZERLAND

Office CH

Page 4: Presentation on VLF by HVDSA

Products

• Universal High Voltage Test System HVA-Series

• Tan Delta Test System TD-Series

• Partial Discharge Detection and Location for • Partial Discharge Detection and Location for

MV Cables PD-Series

HIGH VOLTAGE DIAGNOSTICS SARL

Page 5: Presentation on VLF by HVDSA

Why VLF Cabel Testing?

► Space charges that can occur under elevated DC voltages. Water trees can result in localized stress enhancements.

► Reapplication of normal AC power: Water tree sites can ultimately lead to an electrical tree or trees.

HIGH VOLTAGE DIAGNOSTICS SARL

► Once an electrical tree has been initiated, complete cable failure is normally imminent and inevitable.

► A single water tree which converts to an electrical tree is causing a cable to fail!

Page 6: Presentation on VLF by HVDSA

Why VLF Cabel Testing?

► D.C. Testing of XLPE will only find gross defects.

► Diagnostic testing like Tan Delta or Partial Discharge is not possible with D.C.

► D.C. only tests the resistive component (R) or

HIGH VOLTAGE DIAGNOSTICS SARL

► D.C. only tests the resistive component (R) or conductance in a cable.

Page 7: Presentation on VLF by HVDSA

Why VLF Cabel Testing?

►Why nearly no 50Hz-Tests?

P = L (ω.C) U2

P = L (2.PHI.freq.C) U2 = 1 (2 * 3.14 * 50 * 0.33) 142 = 20 kVA

HIGH VOLTAGE DIAGNOSTICS SARL

VPE-Cabel 14kV Test 1000m 95mm2(C = 330nF/km typical cabel)

Result: Too Heavy, too expensive

Page 8: Presentation on VLF by HVDSA

VLF Testing

Standards

• IEEE 400 & IEEE 400:2 – Revised 2001 (USA)

• IEC 60060-3 (Europe & International)

• CENERLEC HD 620 & 621 (Europe & International)

• VDE 0276 Part 620

• SANS 10198 (South Africa)

• NEN3620/C1 ( Nederland)

HIGH VOLTAGE DIAGNOSTICS SARL

Page 9: Presentation on VLF by HVDSA

VLF Testing

VLF 0,1Hz Voltage Testing according DIN VDE 0276 (HD 620 S1)

Cable

PVC

and

Test Voltage Voltage Time

DC 5,6 – 8 U0 15 – 30 min

AC 45 - 65 Hz 2 U 30 min

HIGH VOLTAGE DIAGNOSTICS SARL

and

PILC

VPE

(XLPE/PE)

AC 45 - 65 Hz 2 U0 30 min

AC 0,1 Hz 3 U0 30 min

AC 45 - 65 Hz 2 U0 60 min

AC 0,1 Hz 3 U0 60 min

Page 10: Presentation on VLF by HVDSA

VLF Testing

Advantage Disadvantage

� Sinusoidal Waveform

� Stresses both resistivity R and impedance R, L and C

� Higher breakdown strength than 50Hz

� Tan Delta measurements – possible

Partial discharge measurements – possible

not 50Hz but

0.1Hz

HIGH VOLTAGE DIAGNOSTICS SARL

� Partial discharge measurements – possible

� Stress lines similar to 50Hz on cable, terminations &

joints.

� Sinusoidal is symmetrical under any load (electronically

generated)

Page 11: Presentation on VLF by HVDSA

HVA 30Universal High Voltage Test System

Output Voltage

• Sinusoidal: 0-33 kV peak, 23kV RMS

• DC ±: 0-30 kV (both polarities)

• Square-Wave: 0-30kV

Output Current

• 15mA

HIGH VOLTAGE DIAGNOSTICS SARL

• 15mA

Frequency

• 0,01Hz to 0,1Hz

Load

• 0,5µF @ 0,1Hz @ 23kV RMS

• 12µF Maximum Capacitance!

Page 12: Presentation on VLF by HVDSA

HVA 30Universal High Voltage Test System

Auto Frequency Selection

AC (VLF) Symmetrical and load independent across full range

Fast Trip Out and Fault Conditioning Burn Modes

HIGH VOLTAGE DIAGNOSTICS SARL

Less than 20kg

Modes

Programmable Fully Automatic Test Sequences

Page 13: Presentation on VLF by HVDSA

HVA 30Universal High Voltage Test System

Battery (optional)

Build-in 12kV Feedback Protection!

PC Software „HVA Control Center“

HIGH VOLTAGE DIAGNOSTICS SARL

Less maintainance – no oil used

No thermal limitation for operating time

Page 14: Presentation on VLF by HVDSA

HVA 30-5 Ultra High Power

Universal High Voltage Test System

Output Voltage

• Sinusoidal: 0-33 kV peak, 23kV RMS

• DC ±: 0-30 kV (both polarities)

• Square-Wave: 0-30kV

Output Current

• 85mA

HIGH VOLTAGE DIAGNOSTICS SARL

• 85mA

Frequency

• 0,01Hz to 0,1Hz

Load

• 5µF @ 0,1Hz @ 19kV RMS

• 15µF Maximum Capacitance

Page 15: Presentation on VLF by HVDSA

HVA 60Universal High Voltage Test System

Output Voltage

• Sinusoidal: 0-62 kV peak, 44kV RMS

• DC ±: 0-60 kV (both polarities)

• Square-Wave: 0-60kV

Output Current

• 37mA

HIGH VOLTAGE DIAGNOSTICS SARL

• 37mA

Frequency

• 0,01Hz to 0,1Hz

Load

• 1µF @ 0,1Hz @ 44kV RMS

• 5µF @ 0,02Hz @ 44kV RMS

• 15µF Maximum Capacitance

Page 16: Presentation on VLF by HVDSA

HVA 90Universal High Voltage Test System

Output Voltage

• Sinusoidal: 0-90 kV peak, 64kV RMS

• DC ±: 0-90 kV (both polarities)

• Square-Wave: 0-90kV

Output Current

• 40mA

HIGH VOLTAGE DIAGNOSTICS SARL

• 40mA

Frequency

• 0,01Hz to 0,1Hz

Load

• 1µF @ 0,1Hz @ 64kV RMS

• 10µF @ 0,01Hz @ 64kV RMS

• 11µF Maximum Capacitance

Page 17: Presentation on VLF by HVDSA

HVA Series

• The load independent, symmetrical output waveform avoids the

potentially destructive space charge effects caused by DC

polarization that occurs in aged extruded cables such as XLPE / PE /

EPR.

• The instrument automatically calculates the optimum frequency to • The instrument automatically calculates the optimum frequency to

energize larger loads (longer cables).

• The instrument is easily programmable allowing the operator to

setup or select test sequences in either automatic or manual mode.

HIGH VOLTAGE DIAGNOSTICS SARL

Page 18: Presentation on VLF by HVDSA

HVA Series

The HVA measures the real time output wave and digitize the

V (applied)

ITOTAL

IR

I Capacitive

IC

HIGH VOLTAGE DIAGNOSTICS SARL

The HVA measures the real time output wave and digitize the

information (Digital Signal Processor). Therefore it is possible to

measure not only the RMS leakage current but also the Capacitive

current (capacitance is displayed) AND the resistive current

(Megohm reading).

Page 19: Presentation on VLF by HVDSA

HVA SeriesExample:

HVA60 Output Load

1.0 µF @ 0.1 Hz @ 44kV RMS (Approx 3 km of cable)

2.0 µF @ 0.05 Hz @ 44kV RMS (Approx 6 km of cable)

5.0 µF @ 0.02 Hz @ 44kV RMS (Approx 15 km of cable)

Maximum Capacitance 10µF

HIGH VOLTAGE DIAGNOSTICS SARL

Based on a typical cable: 330nF/km

P 2 π F (Hz) C (µF/km) V2

(kV)

L (km)= 1216,34 2 3,1416 0,1 0,33 44 3,030085 km

Length (km) = P / (2. π . F . C(µF/km) . V2)

Page 20: Presentation on VLF by HVDSA

HVA SeriesApplications

• Cables: XLPE, PE, EPR, PILC etc.

such as IEEE 400.2, VDE 0276, CENELEC HD 620 S1, the

present draft of IEC 60060-3, etc.

• Capacitors

• Switchgear

HIGH VOLTAGE DIAGNOSTICS SARL

• Switchgear

• Transformers

• Rotating Machines (IEEE 433)

• Insulators

• Bushings

Page 21: Presentation on VLF by HVDSA

DIAGNOSTICSTAN DELTA Test System

• Easy method to diagnose the condition of the cable

isolation

• Non destructive method

• A method to diagnose “Water Trees”

HIGH VOLTAGE DIAGNOSTICS SARL

• A method to diagnose “Water Trees”

• Preventive maintenance – scheduling of repair and

replacement

Preventive maintenance

Page 22: Presentation on VLF by HVDSA

DIAGNOSTICSTAN DELTA Test System

A cable is a large capacitor.

IC is very large

IR is very small

HIGH VOLTAGE DIAGNOSTICS SARL

TD = Tan Delta ( δδδδ ) = True Power

Capacitive Reactive Power

= U2/R

U2 C

= 1

CRXLPE = 1.2 x 10-3

PILC = 50 X 10-3

Page 23: Presentation on VLF by HVDSA

DIAGNOSTICSTAN DELTA Test System

Conventional System:

HIGH VOLTAGE DIAGNOSTICS SARL

Page 24: Presentation on VLF by HVDSA

DIAGNOSTICSTAN DELTA Test System

HIGH VOLTAGE DIAGNOSTICS SARL

Page 25: Presentation on VLF by HVDSA

DIAGNOSTICSTAN DELTA Test System

HIGH VOLTAGE DIAGNOSTICS SARL

Page 26: Presentation on VLF by HVDSA

TD30/TD60TAN DELTA Test System

Input Voltage

• TD30 1– 23 kV RMS TD60 1-44kV RMS

• 2 „C“Type Batteries (10hours)

Tan Delta

• Resolution: 1 x 10-5

HIGH VOLTAGE DIAGNOSTICS SARL

• Accuracy: ± 1 x 10-4 (load > 15nF)

Frequency

• 0,1Hz

Load

• Standard 15nF to 5µF (minimum 1µA RMS)

Page 27: Presentation on VLF by HVDSA

TD30/TD60 TAN DELTA Test System

3kg only! (TD60 5kg)

Comprehensive Computer software

„TD Control Center“

BluetoothTM Dongle

HIGH VOLTAGE DIAGNOSTICS SARL

No complicated wiring, easy set-up!

Bluetooth Dongle

Visual indication of TD Levels

Page 28: Presentation on VLF by HVDSA

HIGH VOLTAGE DIAGNOSTICS SARL

Page 29: Presentation on VLF by HVDSA

TD30/TD60 TAN DELTA Test System

• HVA TD Systems fits directly into the HVA Series of Generators

• TD Measurement and Pressure Testing at the same time

• No need for separate fibre optics for data transmission

• Ultra small size and light weight TD system (3kg for TD30 and 5kg for

HIGH VOLTAGE DIAGNOSTICS SARL

• Ultra small size and light weight TD system (3kg for TD30 and 5kg for TD60)

• Standard Bluetooth built in for easy setup on computers running Microsoft Windows

• Complete PC based Reporting and Storage Software included

Page 30: Presentation on VLF by HVDSA

TD30/TD60 TD Control Center

HIGH VOLTAGE DIAGNOSTICS SARL

Page 31: Presentation on VLF by HVDSA

TD30/TD60 TD Control Center

HIGH VOLTAGE DIAGNOSTICS SARL

Page 32: Presentation on VLF by HVDSA

HIGH VOLTAGE DIAGNOSTICS SARL

Page 33: Presentation on VLF by HVDSA

SMART VLFwith Tan Delta

► Diagnose your existing network quick and easy

HIGH VOLTAGE DIAGNOSTICS SARL

► Make a fingerprint of your new installations or maintenance work as a future reference

Page 34: Presentation on VLF by HVDSA

PD30/60/90Partial Discharge

High Voltage Filter &

Coupling Capacitor High Voltage VLF 0.1

Hz source

HVA series

HVA 30 / 60 / 90

HIGH VOLTAGE DIAGNOSTICS SARL

Partial Discharge

Detector

PC laptop & Software for

P.D. diagnostics and P.D.

location

Page 35: Presentation on VLF by HVDSA

PD30/60/90Partial Discharge

• A TDR snapshot is done for calibrating the PD magnitude.

• This can also provide information on the length of the cable, locations of

joints, condition of the neutral wire.

HIGH VOLTAGE DIAGNOSTICS SARL

Page 36: Presentation on VLF by HVDSA

PD30/60/90Partial Discharge

Once the cable length has been specified and the joints are located, the

cable can be energized.

Distance Fault Location

HIGH VOLTAGE DIAGNOSTICS SARL

Page 37: Presentation on VLF by HVDSA

PD30/60/90DSO graph LOC graph

Cable

lengt

h

Propagation

velocity

PD Amplitude &

Location

TDR signature

HIGH VOLTAGE DIAGNOSTICS SARL

PD discharge meter Test Voltage Meter

Coupling

Capacitor

Page 38: Presentation on VLF by HVDSA

High Voltage Diagnostics Sarl

4, Rue de Lac

CH 1897 Le Bouveret

Switzerland

Page 39: Presentation on VLF by HVDSA
Page 40: Presentation on VLF by HVDSA

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