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Sr.: REV.: Description Drawing No. Date Remark
CLIENTE:
ELLICA MONTE REDONDO S.A.
CONTRACTOR:
DONGFANG ELECTRIC CORPOATION LTD.
PROJECT: LAJA HYDROELECTRIC PLANT PROJECT, CHILE
DRAWING TITLE
NES5100 Excitation System
Operation and Maintenance Manualfor Chile LAJA Hydroelectric Plant
DESIGNED Huang Weiping 2012-5-13 Manufacture
CHECKED Zhu Hongchao 2012-5-13NARI Technology Development Ltd.
Company
TRANSLATED
APPROVED He Qianchao 2012-5-13DEC file No: Y25 -029-0
SCALE AS SHOWN Pages 32 (Inc. this page)
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Catalogue
1 Purpose...........................................................................................................................................2
2 Applicable Position ........................................................................................................................2
3 Brief Introduction of NARI excitation system...............................................................................2
3.1 Introduction.........................................................................................................................2
3.2 Hardware.............................................................................................................................2
3.2.1 The components of NES5100 excitation system:.....................................................2
3.2.2 NES5100 excitation system includes five cabinets:.................................................2
3.3 Software ..............................................................................................................................3
4 Excitation system configuration.....................................................................................................3
4.1 NES5100 AVR configuration:..........................................................................................4
4.1.1 AVR Card .................................................................................................................4
4.1.2 Power Supply ...........................................................................................................6
4.1.3 AVR control mode....................................................................................................74.1.4 Protection .................................................................................................................8
4.2 SCR cabinet configuration ..................................................................................................9
4.2.1 SCR bridge...............................................................................................................9
4.2.2 synchronizing transformer .......................................................................................9
4.3 Deexcitation OVP cabinet configuration .......................................................................10
5 Excitation system start, stop and operation..................................................................................10
5.1 Local operation .................................................................................................................10
5.1.1 AVR button instruction...........................................................................................10
5.1.2 HMI software .........................................................................................................12
5.2 Excitation checking before starting...................................................................................16
5.3 Start excitation ..................................................................................................................16
5.3.1 AVR mode selection ...............................................................................................16
5.3.2 Main AVR controller selection ...............................................................................16
5.3.3 Start excitation .......................................................................................................16
5.4 On line operation...............................................................................................................17
5.5 Stop excitation...................................................................................................................17
5.6 Inspection and notice items during AVR operation ...........................................................17
6 Maintenance and Troubleshooting ...............................................................................................18
6.1 Maintenance......................................................................................................................186.1.1 Introduction............................................................................................................18
6.1.2 Working Condition during Operation ....................................................................18
6.1.3 Quarterly Maintenance...........................................................................................19
6.1.4 Yearly Maintenance (During Planned Shutdown)..................................................19
6.2 How to Find Failure ..........................................................................................................20
6.3 Summary of Failure Signals..............................................................................................20
6.4 Troubleshooting ................................................................................................................22
6.4.1 Principles for Troubleshooting...............................................................................22
6.4.2 Guideline for Replacement of Boards....................................................................22
6.4.3 Troubleshooting .....................................................................................................23
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NES5100 Excitation System
Operation and Maintenance Manual
1 Purpose
This Manual described the operation procedure of NES5100 regulator, introducedsafety points for attention and operation features of regulator, which can instructtechnicians for successful execution of regulator operation and maintenance.
2 Applicable PositionsOperation technicians and maintenance technicians
3 Brief Introduction of NARI excitation system
3.1 Introduction
The NES5100 excitation system from China NARI is new generation digitalexcitation system in the world. The system provides DC field current to controlgenerator voltage and keep it constant. The AC power source is from excitationtransformer. The generator voltage and current all go to AVR as signal feedback.
The field voltage and current are target controlled values. NES5100 excitationsystem consists of signal measurement module, control module, SCR (Siliconcontrolled rectifier) module, protection loop and etc.. In the excitation system, theinput current from excitation transformer goes to three phase full-controlled SCRBridge. SCR Bridge creates and controls the output DC field current. For loadrejection and deexcitation, excitation system can provide rapid response.Excitation system control SCR Bridge by firing pulse. The firing pulse created bydigital controller in AVR. AVR has two redundant channels as channel A and
channel B. Two channels have own firing loop and auto following function,guarantee smooth switching between two channels.
3.2 Hardware
3.2.1 The components of NES5100 excitation system:
Controller and I/O module Signal measurement module HMI
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Power supply module RCR module R/C absorption module Deexcitation protection module
Electrical breakers
3.2.2 NES5100 excitation system includes five cabinets:
One AVR control (NES5100 voltage regulator) cabinet, for excitation control,monitoring and I/O communication.
Two Rectifier cabinets, consists of SCR module, electrical breakers, fan andSynchronizing transformer etc.. . SCR module consists of SCR bridges, RC
absorption loop and pulse loop.
One Deexcitation OVP cabinet, for protecting generator and excitation
system. One excitation transformer, for offering power to SCR module.
3.3 Software
NES5100 uses ARM as microprocessor to execute control code. The softwareconsists of all required system function block. The definition of function block andparameter configuration is all running in read only memory, variants are allrunning in RAM.The application software of NES5100 which is NES5100 HMI software isinstalled in HMI computer. AVRs function, parameters can be configured byNES5100 HMI software. The various function blocks have specific function, forexample, logic gate, PID controller, parameter sampling. There are five controlmode can be selected: Auto mode (voltage loop), Manual mode (current loop),Power Factor mode, Var mode and Open loop (fixed angle). There is protectionfunction block includes over excitation limit, under excitation limit, V/Hz limit andetc.. During the normal operation, the function block can be checked by NES5100HMI software, the AVR status also can be monitored by HMI.
4 Excitation system configurationsExcitation system: For Self-shunt excitation system
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Excitation system type NARI NES5100 digital AVR.
4.1 NES5100 AVR configuration:
4.1.1 AVR Card
NES5100 AVR has two independent and redundant controller as channel A andchannel B. Two channels have own firing loop and auto following function,guarantee smooth switching between two channels. Each channel has 8pluggable cards.
Figure 4-1: 8 cards in one channel
See Table 4-1 for name of boards:
Board
No.Board name
Function
EX01Pulse powerboard
EX01 pulse power board has double power source:
AC220V (or AC110V), DC220V (or DC110V)
input;
+24v output for pulse amplification board
EX02System powerboard
EX02 system power board has double power source:
AC220V (or AC110V), DC220V (or DC110V)
input;
+5V 12V and +24V output for digital board;EX03 CPU board EX03 CPU board is the central control board, with the
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Fig4-2 AVR Front View
Q1 is AC power supply switch of Channel A, Q2 is DC power switch of Channel A, Q3 is AC power supply switch of Channel B, Q4 is DC power supply switch of Channel B, Q5 is AC power supply switch of industrial computer, Q6 is DC power supply switch of DI relay, Q11 is AC power supply switch of Aux circuit, Q12 is AC power supply switch of Heater, Q21, Q22 is DC power supply switch of Control circuit, QM1, QM2, QM3, QM4 is AC power supply switch of Fan, SA1 is +24v power switch of the first rectifiers pulse,
SA2 is +24v power switch of the second rectifiers pulse.
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4.1.3 AVR control mode
There are 5 AVR control mode. Each one can be selected as required.
Auto Mode AVR Use generator voltage as target value, adjustand keep generator voltage constant.
Manual Mode FCR Use excitation current as target value, adjustand keep excitation current constant.
Power Factor Mode Use power factor as target value, adjust andkeep power factor constant.
Var Mode Use Mvar as target value, adjust and keepMvar constant
Fixed angle (Openloop)
Use firing angle as target value.This mode only for commissioning and onlycan be set in HMI.
4.1.4 Protection
NES5100 have a lot of protection function, main protection functions are listed asfollows:
Under excitation limit(UEL)
If the MVar exceed the UEL limit line in PQdiagram, The UEL will be active in 0.06s,generator voltage will be raise until MVarreturn to normal scope.The UEL set point is set according togenerator PQ character.
Over excitation limit(OEL)
If the MVar exceed the OEL limit line in PQdiagram, The OEL will be active in 5s,generator voltage will be lower until MVarreturn to normal scope.The OEL setpoint is set according togenerator PQ character.
V/Hz limit(VEL)
If the V/Hz ratio exceeds the limit line, TheVEL will be active in 0.06s, AVR will controlV/Hz within 1.06.
PT disconnectIf main channel report PT disconnect, mainchannel will switch to following channel, Automode will switch to Manual mode in main
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channel.
Forced Excitation limit(FEL)
Forced excitation limit allow AVR keepworking in short time when excitation currentis twice as much as rating. The more
excitation current the less time keepexcitation.
No-load Over Voltageprotection
In no-load operation, the generator voltagemore than 130% rating, protection will beactive in 0.06s. Excitation will be stopimmediately.
Low frequency andloss excitationprotection
AVR detect generator voltage and frequency.If frequency is too low to exceed limit, Lowfrequency and loss excitation protection willbe active.
4.2 Rectifier cabinet configuration
4.2.1 Thyristor bridge
Circuit breaker:3-pole separate AC circuit breaker and 2-pole separate DCcircuit breaker.
Power source: excitation transformer , 420VAC 50Hz three phases output: 210V DC voltage,710A DC current
2*100% Thyristor bridge Two redundant bridge (cabinet) with RC absorption
module. If one bridge fault, the other one can keep AVR normal working. Pulse transformers: used for transforming spring pulse.
4.2.2 Synchronizing transformer
Power source: excitation transformer , 420VAC 50Hz three phases
Transformer model: 200VA,50Hz,650V/150V,Y/D-1.output rating: 97VAC,three phases.
Transformers: Two redundant transformers, one is used for channel A, andthe other one for channel B. If one with fault, it will not influence the othernormal channel.
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4.3 Deexcitation OVP cabinet configuration
Circuit breaker (4 pole): disconnect the rectifier and rotor. Non-linear resistor: the deexcitation fleetly equipment.
Initial excitation option an initial excitation is necessary which is activated for
around 410 seconds when the normal excitation is activated. The initial
excitation can be fed from the power station battery or from the 3AC
400V station service switchgear. Control circuit: this circuit is major used for controlling Breaker.
5 Excitation system start, stop and operation
5.1 Local operation
5.1.1 AVR button instruction
The basic local control of AVR by buttons in front of AVR panel:
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Fig 5-1 AVR front view
Table5-1 AVR buttons :
Button Function Note
S1 Excitation Raise
To raise generator voltage in Auto mode;To raise rotor current in Manual mode;To raise PF in PF mode;To raise MVar in Var mode.
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5.1.2 HMI software
NES5100 HMI software is developed by NARI company. The software installed inHMI computer.We can do following thing through AVR HMI:
Reading electrical values of generator, field and bus line Reading status of excitation system Reading Error log and locate fault and do diagnosis.
AVR commissioning Setting AVR parameters
Fig5-2 AVR HMI display
S2: Excitation Lower
To lower generator voltage in Auto mode;To lower rotor current in Manual mode;To lower PF in PF mode;To lower MVar in Var mode.
S3:
Excitation On To start excitation to build generator voltage to
100%.
S4: Excitation OffTo stop excitation to lower generator voltageto 0.
QK1: PSS Enable Enable PSS function (Optional)
QK2: A/B ActiveSwitch main channel between channel A andB.
QK3: HMI Enable Power switch of HMI computer
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In the top of the window shows state indication and parameter readings. Left ofthe window is optional tag. Center of the window is topology of excitation system.
Table 5-2 HMI
Function Icon Indication Note
Channel
Normal (Green)
Communication is normal
COMUNICATION
STATE Channel Fault
(Red)
Communication with fault
Waiting Excitation is offEXCITATION
STATE No-load/On-line Excitation is on
Voltage-loop Auto Mode (AVR)
Current-loop Manual Mode FCR
PF Power Factor Mode
Var Var Mode
1
State
Indication
CONTROL
MODE
Fixed-angle Open-loop Mode
TRIGGER
ANGLE
Degree Normal range 20 -150 .
POWER
FACTOR
Displays the power factor
of generator.
GENERATOR
FREQUENCY
Hz Displays the measured
value of terminal
frequency of generator.
STATOR
VOLTAGE
% Displays the measured
value of generator unit
stator voltage (PT).
VOLTAGE
SETTING
% Displays the given value
of generator unit stator
voltage.
2
ParametersReading
ACTIVE POWER
MW Displays the measured
value of the active power
of generator.
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ROTOR
CURRENT
A Displays the measured
value of generator rotor
current.
CURRENT
SETTING
A Displays the given value
of generator rotor current.
REACTIVE
POWER
MVar Indicates the measured
value of the reactive
power of generator.
In system topology, there
are the schematic
diagram of system
connection, and visual
graphic marks. If a graphic
clicked is highlighted or
brightened, it shows that
the internal related data of
this graphic may be
observed.
What displayed in the
parameter window on theinterface is the parameter
run at the present section.
Here, the parameter is
only displayed, but not to
be revised.
We can set all parameters
in setting window.
Check the fault history in
Err Log. Any date can be
checked in history.
The list shows limit, alarm
and fault.
3
Function
Block
MONITER UNIT
Exit the HMI software.
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5.2 Excitation checking before starting
1. Verify insulation breaker of PT and CT, check the PT and CT terminal is wellconnected.
2. Turn all AVR power breakers on, check the voltage is OK.3. Verify AVR cards with no fault, HMI display is normal, communication
between DCS and AVR is OK.4. Open and close field breaker once time to verify field breaker is normal
5.3 Start excitation
NES5100 can be started from local or remote. Normally AVR should be startedfrom remote, while local operation mode is usually used for test .
5.3.1 AVR mode selection
1) Auto mode (Voltage-loop). AVR normal running all use Auto mode.2) Manual mode (Current-loop). Not recommend to use this mode in normalrunning. If AVR PT failure is detected, will switch from Auto mode to Manual mode
3 Var mode (VAR control). If adjustment is over, may cause over excitation and
under excitation. So not recommend to use this mode in normal running
4 Power Factor mode. Normally dont use this mode, if use this mode, voltage of
generator and bus line should be monitored to avoid over or under voltage.Operator also can change AVR mode manually from DCS AVR control window.
5.3.2 Main AVR controller selection
When AVR is running, Channel A and B are redundant. When channel A work asmaster, channel B will be following as backup. If Channel A is down, mainchannel will switch to channel B smoothly. Operator also can change mainchannel manually at site. See Fig 5-1
5.3.3 Start excitation
1. Close circuit breaker QS1, QS2, QS3, QS4, and field circuit breaker FMK.2. After the generator achieves the rating speed, operate excitation on button
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at site or DCS, the generator voltage will be raised to the reference value.3. Operator can adjust generator voltage and MVar by Raise and Lower button
manually at site or DCS as required.
5.4 On l ine operation
Operator can adjust MVar though Raise and Lower button at site or DCS
5.5 Stop excitation
Whatever AVR work in Auto mode or Manual mode, AVR can be stopped asnormal by following step:1. Press excitation off button from Local (AVR) or Remote (DCS).2. The generator voltage will drop down in a short time.3. After generator voltage achieves zero, operator can open field circuit breaker
FMK.
Emergency stop:Operator can open field circuit breaker FMK directly when emergency, AVR start
de-excitation, lower generator voltage to zero immediately.
5.6 Inspection and notice items during AVR operation
1. Check temperature in excitation system room, the temperature should be
under 40 , air conditioner is normal.
2. Check AVR status, no alarm, no abnormal displayed on AVR cards.
3. Operator should monitor generator voltage and MVar very carefully. Adjustgenerator voltage and MVar in time to avoid over voltage or under voltage.
4. If AVR report alarm, the problem should be solved in time. If cause is not clear,check in local, or contact technical department.
5. AVR can reset alarm itself if problem is cleared away. Error history is saved inErr Log. The curve can be saved automatically for analysis.
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6.1.3 Quarterly Maintenance
Quarterly maintenance is primarily visual check.
Comparison between measured value (under working condition ): Observe
measured value of two channels and compare the measured value with displayvalue indicated by control room; engineer should compare measured value ofvoltage and reactive power with their display value. If no reference value isavailable for comparison with measured value, engineer must use previouslymeasured value to estimate accuracy of measured value .
Detect redundant regulator circuit (under working condition or )
Engineer can change set value of regulator by increasing or reducing excitation;standby channel should automatically track operating channel; engineer mayobserve tracking results through monitoring interface.
Switch between operating mode or operating channel (under working
condition )
Engineer should perform switch between operating modes or operating channels;field current and generator stator voltage should not obviously change. This alsoverifies whether pulse trigger circuit is normal.If switch is performed stably, then all standby circuits can be considered normal.On the contrary, if switch between channels cause significant change in workingcondition, then engineer should find the reason for failure by referring to FailureFinder.
After test is completed, operator should switch manual mode
into automatic mode.
6.1.4 Yearly Maintenance During Planned Shutdown)
After removing dust, tightening terminal screw and detecting insulation, performthe following check:
Calibrate external control signals (under working condition ): find input
signal source and simulate contact action according to drawings; see if circuit isnormal by observing indicator lamp on digital board, relevant interface in
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Synchronous frequency B-phase
failure
Synchronous frequency C-phase
failureSynchronous phase A-phase failure
Synchronous phase B-phase failure Synchronous phase
failureSynchronous phase C-phase failure
Synchronous phase
sequence failureSynchronous phase sequence failure
+A-phase pulse alarm
-C-phase pulse alarm
+B-phase pulse alarm
-A-phase pulse alarm
+C-phase pulse alarm
-B-phase pulse alarm
Pulse read-back failure
Pulse failure
Pulse count failure
Ethernet communication failure
485 communication failure
UART communication failure
CAN1 communication failure
Communication failure
CAN2 communication failure
A/D failure
FPGA failure
SPI failure
TC2 interrupt failure
TC3 interrupt failure
TC4 interrupt failure
Main task failure
EX03 board hardware
and software failure
TC4 task failure
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UART task failure
Update task failure
USB task failure
Power source detection failure
Field flashing failure
PT line broken failure
No-load load switch close failure
Loaded load switch open failure
Electrical circuit failure
and functional failure
Power cabinet failure
Table 6-1: Failure Signals Note: indicates that this channel can be detected.
6.4 Troubleshooting
Repair engineers must follow safety instruction contained in
Chapter 1.
6.4.1 Principles for Troubleshooting
Under most circumstances, user can locate failure and perform timelytroubleshooting by reading failure information recorded in failure log module inmonitoring software.If failure in hardware or software of excitation regulator is not caused by anexternal reason, operator can attempt to restart excitation regulator. If operatorcan remove failure by restarting excitation regulator, then system will work again.If operator can not remove failure by doing so and failure signal keeps appearing,then operator may attempt to replace board.
6.4.2 Guideline for Replacement of Boards
If you intend to replace board, you must be aware that the board is printed circuit
board, and that electrostatic discharge from CMOS components may causepersonal injury.
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Rubbing synthetic fibre may result in electrostatic discharge.
When operator operates circuit board, operator must follow the followinginstruction in order to avoid electrostatic discharge:
Mount antistatic rubber on test bed beside the cabinet, and connect ground
wire to the framework of the cabinet.
Touch a paint-free space in the cabinet before touching circuit board so that
you can perform electrostatic discharge.
Store the standby board in their original package.
Please carefully read the abovementioned instructions before replacing boards.Procedure for replacement is as follows:1. Disconnect the electrical power to regulator;2. Pull out board that needs replacing with special tools;3. Disassemble circuit board;4. Make sure that model of new circuit board is the same as faulted circuit boardor make sure that new circuit board is compatible with faulted circuit board;5. Compare identification code of jumper, components (variable resistance,built-in program or data chip with that of faulted board and make sure that theyare the same; otherwise you can not ensure that new circuit board worksnormally.
Our spare parts have been tested in our factory; jumper has been
set and program has been downloaded; operator can directly
replace worn parts with our spare parts.
6.4.3 Troubleshooting
This section tells user how to remove failure listed in Table 7-1. User can performtroubleshooting by using the methods described in Troubleshooting or completeFailure Description Form and send it to Electrical Control Branch, NARI GroupCorporation so that technicians can analyze the location of failure.
6.4.3.1 Stator Frequency Failure
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Failure inquiry
During the commissioning or operation of excitation regulator, if alarm signalappears or alarm indicator lamp on EX03 board flashes, operator can make an
inquiry of the type of failure by reading Failure Log in monitoring software.If a record of Stator frequency failure is available, check to see if it is Statorfrequency * phase failure and determine whether the alarm is given by aregulator or not.
Troubleshooting procedure is as follows:
Check to see if voltage source meets requirements in the process of
commissioning, and if voltage signal is correct by using test device to test voltageat terminal or other locations;
If voltage source signal is correct, then operator must check EX04 board and
EX03 board; If a set of regulator fails, operator may replace EX04 board andEX03 board of both regulators so as to determine which board fails;
6.4.3.2 Stator Phase Failure
Failure inquiry
During the commissioning or operation of excitation regulator, if alarm signalappears or alarm indicator lamp on EX03 board flashes, operator can make aninquiry of the type of failure by reading Failure Log in monitoring software.If a record of Stator phase failure is available, check to see if it is Stator phase *phase failure and determine whether the alarm is given by a regulator or not.
Procedure for troubleshooting is as follows:
Open oscilloscope in monitoring software, and check to see if waveform of
Stator voltage signal is correct and if Stator voltage phase is normal;
If waveform of Stator voltage signal is incorrect, check voltage signal at
voltage terminal 1001 according to drawings, and check to see if wiring is corrector terminal is loosened;
If wiring is correct, check to see if voltage source meets requirements in the
process of commissioning; Check to see if voltage signal is correct by using testdevice to test voltage at terminal or other locations in the process of operation;
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If voltage source signal is correct, then operator must check EX04 board and
EX03 board; If a set of regulator fails, operator may replace EX04 board andEX03 board of both regulators so as to check to see which board fails;
If oscilloscope module indicates that waveform of Stator voltage is correct,
operator should check to see which board fails by step ;
6.4.3.3 Synchronous Frequency Failure
Failure inquiry
During the commissioning or operation of excitation regulator, if alarm signalappears or alarm indicator lamp on EX03 board flashes, operator can make an
inquiry of the type of failure by reading Failure Log in monitoring software.If a record of synchronous frequency failure is available, check to see if it issynchronous frequency * phase failure and determine whether the alarm isgiven by a regulator or not.
Procedure for troubleshooting is as follows:
Check to see if synchronous voltage source meets requirements in the
process of commissioning; Check to see if voltage signal is correct by using testdevice to test voltage at terminal or other locations in the process of operation;
If voltage source signal is correct, then operator must check EX05 board and
EX03 board; If a set of regulator fails, operator may replace EX05 board andEX03 board of both regulators so as to check to see which board fails;
6.4.3.4 Synchronous Frequency Phase Failure
Failure inquiryDuring the commissioning or operation of excitation regulator, if alarm signalappears or alarm indicator lamp on EX03 board flashes, operator can make aninquiry of the type of failure by reading Failure Log in monitoring software.If a record of synchronous phase failure is available, check to see if it issynchronous phase * phase failure and determine whether the alarm is given bya regulator or not.
Procedure for troubleshooting is as follows:
Open oscilloscope in monitoring software, and check to see if waveform of
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synchronous voltage signal is correct and if synchronous voltage phase iscorrect;
If waveform of synchronous voltage signal is incorrect, check voltage signal at
synchronous voltage terminal 1005 according to drawings, and check to see ifwiring is correct or terminal is loosened; And then check to see if signal terminalof synchronous transformer is loosened;
If wiring is correct, check to see if synchronous voltage source meets
requirements in the process of commissioning; Check to see if voltage signal iscorrect by using test device to test voltage at terminal or other locations in theprocess of operation;
If synchronous voltage source signal is correct, then operator must check
EX05 board and EX03 board; If a set of regulator fails, operator may replaceEX05 board and EX03 board of both regulators so as to check to see which boardfails;
If oscilloscope module indicates that waveform of synchronous voltage is
correct, operator should check to see which board fails by step ;
6.4.3.5 Synchronous Phase Sequence Failure
Failure inquiry
During the commissioning or operation of excitation regulator, if alarm signalappears or alarm indicator lamp on EX03 board flashes, operator can make aninquiry of the type of failure by reading Failure Log in monitoring software.Correct value of synchronous phase sequence should be 635H.
If a record of synchronous phase sequence failure is available, check to see if aset of regulator fails or both sets of regulators fail.
Procedure for troubleshooting is as follows:
Open oscilloscope in monitoring software, and check to see if waveform of
synchronous voltage signal is correct and if synchronous voltage phase iscorrect.
If waveform of synchronous voltage signal is incorrect, check voltage signal atsynchronous voltage terminal 1005 according to drawings, and check to see if
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wiring is correct; And then check to see if signal terminal of synchronoustransformer inside power cabinet is loosened;
If wiring is correct, check to see if synchronous voltage source meets
requirements in the process of commissioning; Check to see if voltage signal iscorrect by using test device to test voltage at terminal or other locations in theprocess of operation;
If synchronous voltage source signal is correct, then operator must check
EX05 board and EX03 board; If a set of regulator fails, operator may replaceEX05 board and EX03 board of both regulators so as to check to see which boardfails;
If oscilloscope module indicates that waveform of synchronous voltage is
correct, operator should check to see which board fails by step ;
6.4.3.6 Pulse Signal Alarm
Failure inquiry
During the commissioning or operation of excitation regulator, if alarm signal
appears or alarm indicator lamp on EX03 board flashes, operator can make aninquiry of the type of failure by reading Failure Log in monitoring software.If a record of pulse signal alarm is available, check to see if a set of regulator failsor both sets of regulators fail.
Procedure for troubleshooting is as follows:
Measure value of small pulse by opening square waveform and pulse
detection in monitoring software; correct pulse value of various kinds ofphase is following:
+A -A +B -B +C -C
130 40 96 06 192 12
If value of phase pulse is incorrect, engineer should check to see if signal
wiring is correct or loosened;
If wiring circuit is correct, engineer should check to see if EX03 board or EX08
board fails and determine the source of failure by replacing board one by one.
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6.4.3.7 Pulse Read-back Failure
Failure inquiry
During the commissioning or operation of excitation regulator, if alarm signal
appears or alarm indicator lamp on EX03 board flashes, operator can make aninquiry of the type of failure by reading Failure Log in monitoring software.If a record of pulse read-back failure is available, check to see if a set of regulatorfails or both sets of regulators fail.The principle for pulse read-back detection is as follows: pulse from EX08 boardflows through pulse read-back circuit and is sent to FPGA after level translation;FPGA checks to see if pulse read-back is correct by judging whether pulsereturned is identical with pulse sent.
Procedure for troubleshooting is as follows:
Engineer should check to see if EX03 board or EX08 board fails, and if the failurecan be removed by resetting EX03 board.If engineer fails to remove the failure, he may determine the source of failure byreplacing board one by one.
6.4.3.8 Pulse Count Failure
Failure inquiry
During the commissioning or operation of excitation regulator, if alarm signalappears or alarm indicator lamp on EX03 board flashes, operator can make aninquiry of the type of failure by reading Failure Log in monitoring software.If a record of pulse count failure is available, check to see if a set of regulator failsor both sets of regulators fail.The principle for pulse count is as follows: pulse from EX08 board flows through
pulse read-back circuit and is sent to FPGA after level translation. FPGA checksto see if pulse count is correct by judging whether pulse returned is identical withpulse sent.
Procedure for troubleshooting is as follows:
Engineer should check to see if EX03 board or EX08 board fails, and if the failurecan be removed by resetting EX03 board.If the failure can not be removed, then determine the source of failure by
replacing board one by one.
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A/D failure
FPGA failure
SPI failure
TC2 interrupt failure
TC3 interrupt failure
TC4 interrupt failure
Main task failure
TC4 task failure
UART task failure
Update task failureUSB task failure E
X 0 3 b o a r d
h a r
d w a r e a n
d s o
f t w a r e
f a i l u r e
Power source detection failure
Table 6-3: EX03 Board Hardware and Software Failure List
Procedure for troubleshooting is as follows:
Engineer should check EX03 and check to see if the failure can be removed byresetting EX03 board.If the failure can not be removed, engineer should determine the source of failureby replacing board one by one.
6.4.3.12 PT Disconnected Failure
Failure inquiry
During the commissioning or operation of excitation regulator, if PTDisconnected Failure alarm signal appears or alarm indicator lamp on EX03board flashes, operator can make an inquiry of the type of failure by readingFailure Log in monitoring software.
PT Disconnected signal means that PT1 used by A channel or PT2 used by Bchannel fails.If failure in current operating channel happens, the regulator will automaticallyactivate standby channel.
Procedure for troubleshooting is as follows:
PT failure is usually caused by PT three-phase imbalance. If PT failure
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happens to A channel, engineer should check to see if PT1 three-phase voltageat terminal block is balanced;
If PT1 three-phase voltage at terminal block is unbalanced, then PT
Disconnected failure may be caused by external reason; Engineer should checkto see PT1 high side fuse is working normally or terminal connection is loosened;
If PT three-phase voltage is balanced, then PT Disconnected failure may be
caused by internal reason. Engineer should check to see if internal connection ofPT1 signal is loosened or check EX04 board and EX03 board.
Engineer should check EX04 board and EX03 board; if a set of regulator fails,
then engineer can determine which board fails by replacing EX04 board andEX03 board of both sets of regulators one by one;If PT failure happens to B channel, remove the failure by following theabovementioned steps.6.4.3.13 Power Cabinet Failure
Failure inquiry
During the commissioning or operation of excitation regulator, if power cabinetfailure alarm signal appears or alarm indicator lamp on EX03 board flashes,operator can inquire about which power cabinet fails by reading Failure Log inmonitoring software.
Procedure for troubleshooting is as follows:
Power cabinet failure comprises power cabinet blower failure, power maincircuit fuse break, power cabinet resistance-capacitance absorption fuse break.Specific form of power cabinet failure depends on failure signal setting of powercabinet.Check to see if failure indicator lamp on power cabinet flashes, and checkrelevant circuit. If power cabinet failure does happen, check relevant digital boardaccording to the design of drawings; if digital board is failure-free, operator shouldcheck EX03 board.
If engineer fails to remove the failure or there is a lack of spare
parts, please call us at our hot line!