Volume B Operation Procedure of Plant Electrical Systems (HTOM-E-02).doc

Revision:Language:Page:

0En 1/176HTOM-E-02

Dept:

HEPEHarbin Huitong Electric Power Engineering Co., Ltd.File no.:

Project: Plant section:

747MW GUDDU Combined Cycle Power Project O&M Manual

Prepared Checked:

Approved:

Form No.:

HTF-0Operation & Maintenance Manual

Date:

2014.3Operation Manual

Revision:Language:Page:

OEn 2/52HTOM-B-07

Dept:

HEPEHarbin Huitong Electric Power Engineering Co., Ltd.File no.:

Project: Plant section:

560MW Bin Qasim Combined Cycle Power Project O&M Manual

Prepared Checked:

Approved:Zhang Yunhai Tie Sijia Li Xianchun

Form No.:

HTF-0Operation & Maintenance Manual

Date:

2011.2Operation Manual

747MW (Gross) Combined Cycle Power Plant Project At GUDDUOperation & Maintenance Manual

Volume BOperation Procedure of Plant Electrical Systems

4SECTION I Main Unit Specification and Characteristic

41.System Overview

42. Main Equipment Parameters

42.1 GT

52.2 ST

123. generator running specification

123.1 GT generator unit

153.2 the generator cooling system

714 generator system test

714.1 test principle

714.2 generator water-break protect test

724.3 generator tightness test

734.4 sealing oil system test

734.5 stator cooling water pump test

744.6 generator test

755. Generator auxiliary device and motor operating specification

755.1 motor general rule

765.2 motor operating mode

775.3 operation and monitoring of the motor

795.4 motor abnormal and trouble shooting

815.5 generator hydrogen cooling system put into, running and stop

885.6 Generator sealing oil system put into, operation and stop

915.7 Generator stator cooling system put into, operation and stop

97Section II Electric system and power distribution device

971 Electric system and device operation principle

971.1 Electric operation precautions

1002 transformer

1173 auxiliary power system

1264 DC system operation

1385. UPS system

1486 power distribution device

1637 diesel generator unit

171Section III unit trouble shooting

1711 unit trouble shooting general tule

1711.1 unit trouble shooting principle

1741unit integrity trouble shooting

1742.1 unit fire hazard

1752.2 unit auxiliary power break off

1763 generator abnormal operation and trouble shooting

1763.1 generator overload operation

1773.2 generator three-phase current unbalance and stator grounding

1783.3 genrator voltage circuit line break-off

1803.4 excitation system fault

1833.5 electric system oscillation and generator step-out

1853.6 generator reverse-power operation

1863.7 generator transformer unit asynchronous parallel

SECTION I Main Unit Specification and Characteristic

1.System Overview

This installation for 1 set of type 747 mw class S209FA multi-shaft gas - steam combined cycle generating units, including two GT and one ST. Gas turbine parts provided by the American GE company, turbine generator parts provided by Harbin electric. 500 kv 3/2 connection mode is adopted in the system, is composed of three complete list. Unit adopts the generator transformer unit wiring, each by a 340 mva three-phase double-winding step-up transformer connected to the 500 kv system, generator export set circuit breaker (GCB), auxilairy use branch meet in # 1, # 2 gas turbine generator transformer group of main transformer low voltage side, high voltage auxiliary transformer adopts the on-load voltage regulating method and normal unit start-stop by main transformer delivers the factory power supply, synchronization by the GCB, do not need to do auxiliary power switching operation, to adapt to the requirements of various kinds of operation mode. Three 500 kv outgoing lines from west to east, GUDDU, MULTAN, MUZAFFAR.

500 kv for direct grounding system, three main transformer neutral point grounding directly. Auxiliary power system is composed of two levels of 6.6 kV and 400 v voltage, 6.6 kV high-voltage Auxiliary system adopt transformer neutral point grounding resistance, 400 v low voltage auxiliary power system with neutral directly grounded.

Gas turbine system generator transformer group adopt production of the series microcomputer type complete protection device by GE, including generator protection G60, circuit breaker protection C60, generator transformer group T60 -u, main transformer protection T60-T, HV transformer protection MIF, main transformer protection RET670, HV auxiliary protection RET650, excitation transformer protection REC650, and the transformer non electrical protection C30, protection of main and backup protection, double completely, its current circuit, dc power supply, fully independent form 100% redundant export relays and cables, make protection device to further improve the safety and reliability of operation.

# 3 generator transformer group protection G60, REG670, generator transformer group T60, MIB, RET670, excitation transformer protection F35, transformer non-electricity protection C30.2. Main Equipment Parameters

2.1 GT

2.1.1 generator

typeGE-324 rated capacity323MVA

rated V15kV rated power274.55MW

rated C12432A rated power factor0.85lagging

rated F50Hz rated rotating speed3000rpm

connecting modeY subtransient reactance0.20

insulation gradeF cooling mode full H2

excitation modeExcitation generatorexcitation performanceHigh start response system

manufacturerAmerican GE company

GCB max.voltage 18KVrated C/rated breaking C13000A/100KV

2. 1.2 main generator#1#2 main generator

typeSFPZ-340000/500TH Rated capacity340000kVA

Rated V 525101.0%/15kV Rated C373.9/13087A

Phase number3connecting groupYN d11

Short circuit resistance MAX H.V.-L.V. 16.67% Cooling mode ONAN66%

RAT H.V.-L.V. 15.88%ONAF85%

MIN H.V.-L.V. 15.92%OFAF100%

manufacturerBaoding Tianwei baobian electric Co.,ltd

500KV breaker

Type SF6 breaker Rated V 550KV

Rated C 3150Arated short circuit breaking C 40KA

1s stable C 40kArated short close/open C 100kA

500KV isolator

typeHorizontal flexible single broken isolating switch 1 s stable C 40KA

Rated V 550KVRated C 3150A

Dynamic stable C 100KA

2.1.3 HV auxiliary transformer #1#2

typeSZ10-35000/15 Rated capacity35000kVA

Rated V 1581.25%/6.9kV Rated C1347/2929A

Phase number 3Connecting groupD yn11

Short circuit resistance MAX H.V.-L.V. 12.450%

RAT H.V.-L.V. 11.705%

MIN H.V.-L.V. 11.683%Cooling modeONAN

manufacturer Fuzhou Tianyu electric Co.,ltd

2.1.4 excitation transformer #1#2

typeZLSCB-2500/15 Rated capacity 2500kVA

Rated V 15/0.92kV Rated C 96.2/1568.9A

Phase number3Connecting group Y d1

Short circuit resistance5.82% Cooling mode AN

manufacturerHainan Jinpan electric Co.,ltd

2.1.5 LCI isotate transformer#1#2

typeZQSC-7000/6.6 Rated capacity 7000kVA

Rated V 6600/2080/2080V Rated C 612.3/971.5/971.5A

Phase number3Connecting group D d0y1

Short circuit resistanceMV TO LV1 6.33%

MV TO LV1 6.05%

MV TO LV2 6.14%

LV1TOLV2 11.72 %Cooling mode AN

manufacturer : Hainan Jinpan electric Co.,ltd

2.2 ST

2. 2.1generator

typeQFSN--300-2Rotating speed3000r/minphase 3

stator connecting mode YYstator outgoing 6leading phase running capabilty0.95 leadingrated power continuous

Rated P280MWRated V 20KVRated C9509A

GCB max. V 23KVRated C 10000ARated breaking C 80KV

cooling medium parameters

Hydrogen P0.3MPaHydrogen purity 98%Oxygen content 85%

power factor >0.7

charger output V 198V~260V

charger output C 0~500A

charger stable voltage precision 1%

charger stable flow precision 2%

charger wave factor 1%

battery rated capacity 2500AH

battery number 103

battery nominal V 2V

battery end V 1.75V

battery discharge C 300A

battery 10h discharge capacity2500AH

DC busbar V 220V~240V

DC busbar C 2000A

noise 55dB

insulation action resistance 1K~99K

busbar V monitoring 0~150

insulation resistance 10M

medium strength AC 2KV 1min

T rise 80K

protection grade IP42

2.2.6 unit diesel generator

TypeAMG 0450BB04Rated power1364KW

Rated V420VRated C2344A

Rated rotating speed1500r/minRated F50HZ

Rated power factor0.8laggingExcitation modeNo-brush,permanent magnet

Connecting modeStar connectingneutral point grouding modedirect grouding

phase3Effiency95.44%

Insulation gradeHProtection gradeIP 23

manufacturerABBProducing china

2.2.7 500KVstep -up diesel generator

TypeAMG 0355AA04Rated P400KW

RatedV420VRated C687A

Rated rotating speed1500r/minRated F50HZ

Rated power factor0.8laggingexcitation modeNo-brush,permanent magnet

Connecting modeStar connectingneutral point grouding modedirect grouding

phase3Effiency94.35%

Insulation gradeHProtection gradeIP 23

manufacturerABBProducing china

2.3 main motor parameter fo turbine boiler

2.3.1 condensate pump motor

TypeYLKK710-4/900Current 75AInsulation grade F

voltage6.6KV power factor0.85Work modeS1

Power supply A6KV Isection B 6KV II section

C6KV Isection/IIsectionmotor rotating speed1488r/min

2.3.2 close circuilating booster pump motor

Type YKK450-6Power 450KW

Voltage 6600KVCurrent 48.2A

Insulation grade FPower factor 0.865

Running mode S1Protection gradey7 IC616

A location 6KV Isection B position 6kv IIsection

Motor rotating speed

2.3.3 auxiliay cooling water pump motor

TypeYKK500-6Power630KW

Voltage 6600VCurrent68A

Power factor 0.81Insulation grade F

Motor rotating speed 993r/minRunning mode VVVS1

Protection grade IP 54

2.3.4 fault shutdown low pressure auxiliary cooling water pump motor

Type Y3-355M1-4Power220KW

Voltage 400VCurrent 371A

Power factor 0.90Rotating speed 1485r/min

2.3.5 water chamber vacuum pump motor

TypeY3 250M-6Power 37KW

Voltage 400VCurrent 67.2A


Effiency92.45%Motor connectionAngle

Protection grade IP 54Rotating speed980r/min

2.3.6 stator water pump motor

TypeY2-180M-2THPower22KW

Voltage400VCurrent 39.0A


Effiency 90.5%Motor connection Angle

Protection grade IP 55Rotating speed 2940r/min

2.3.7 turbine lube oil pump motor

TypeYB2-22.5M-2Power 45KW



Effiency 92%Motor connection Angle

Protection grade IP 55Rotating speed 2970r/mon

2.3.8 turbine jacking oil pump motor

TypeYB2-200L-4Power 30KW



Effiency 92%Motor connection Angle


2.3.9 turbine high pressure seal pump motor

Type YB2-160L-2Power18.5KW



Effiency90.0%Rotating speed2928r/min

2.3.10 turbine EH oil pump motor

TypeM2QA225M4APower45KW


Rotating speed 1480r/minInsulation grade F

Protection grade IP 55Power factor 0.845

2.3.11 generator air side oil pump motor

Type Y180L-6THB3Power 15KW

Voltage 400VRated Current 29.1A


2.3.12generator air side DC oil pump motor

Type Z2-72THPower 13KW

Voltage 220VCurrent 70.7

Insulation grade B Rotating speed 1000r/min

2.3.13 generator hydrogen side DC oil pump motor

Type Z2-41THPower 5.5KW


Insulation grade B Rotating speed 3000r/min

2.3.14 generator hydrogen side oil pump motor

2.3.15 medium pressure feedwater pump

TypeY3 315S-2WTHPower 110KW


Insulation gradeFRotating speed 2975r/min

Power factor0.91Effiency 94%

F50HZProtection grade IP54

2.3.16 condensate re-circuilating pump

TypeY3 315M-4WTHPower 132KW


Insulation grade FRotating speed1486r/min

Power factor 0.87Effiency94%

F50HZProtection grade IP55

2.3.17 high pressure feedwater pump

TypeYKS560-2W-THPower1150KW

Voltage6600Current118A

Insulation gradeFRotating speed2984r/min

Power factor0.89 Cooling modeIC81W

F50HZ Protection gradeIP54

2.3.18 seal fan

TypeM2QA180M2APower 22KW


Insulation grade FRotating speed 2950r/min

Power factor 0.88Running mode S1

2.3.19 instrument air compressor motor

Type Y355-4Power 315 KW

effiency 93.6%Rated Current 34.2A

Voltage 6600Rotating speed 1480r/min

3. generator running specification

3.1 GT generator unit

3.1.1 GT generator unit startup device

By static starter (LCI) and excitation system (EX2100) turn the generator to synchronous motor, start for S9151FA generating set, can save to start the motor and the torque converter and other related accessories, but also save the space around the turbine foundation. LCI control system, control system and Mark VI EX2100 control system is a complete control system. Gas turbine Mark VI control system to provide operation, torque and the speed setting signal to LCI control system, LCI control system according to these signals through the closed loop control mode to provide a change frequency energy generator stator. During startup, EX2100 LCI control to adjust the excitation current, through the control of excitation current and stator current increase and decrease of generator acceleration and deceleration. A set of LCI can be used in many units start, this section is only to start the # 1 # 1 LCI unit as an example to introduce the control process of LCI.

LCI control during unit startup

3.1.1.1 LCI control during unit startup .1.2.1 startup condition check

As HMI choose the starting unit # 1, # 1 LCI L3SS_SEL 1, LCI control system will be sent to Mark VI l3ss_rs control system, used to launch condition check. If the following conditions are met, LCI is in before the start of state:

(1) microcomputer digital signal processor UCVE DSPC and controller communication is normal;

(2) no LCI start-up failure. If appear start-up failure, can be RESET by LCI controller copy;

(3) no 6 kv switch switch failure. If after sending the closing command 3 s LCI, switch is still not closed, send the report to the police and keep, since can RESET on the LCI controller copy;

(4) no LCI export isolation knife switch failure. If, after sending the closing command 16 s LCI, knife is still not closed, hair

This alarm and maintain, and can RESET on the LCI controller copy;

(5) no DSPC to LCI tripping signals. Including the coolant fluid level is low, the coolant fluid level is high, the cooling fluid low resistivity, low cooling liquid circulating pump outlet pressure and ac impedance, dc resistance high temperature, isolation variable temperature higher protection;

(6) no LCI running from DSPC signal;

(7) no gas turbine Mark VI to LCI operation signal L4SSRUN and electrical signals LSS_PWR;

(8) LCI has stopped running more than 20 s;

(9) no on a gas turbine to # 1 lci electrical command;

(10) Ethernet connection is normal.

.1.2.2 startup processing control

after the start condition is met, once started issued instructions, L4SS 1, LCI L4SS master logic 1, at the same time a EX2100 startup command, after a delay time of 19.78 s, generator field has been established, after completing the linker, LCI has current output:

(1) when L4SS 1, Mark VI command lss_pwr LCI on electricity control system, LCI connection program. If within 20 s LCI on electrical unfinished, issued "on the LCI electric fault alarm, make the LCI linker closure, a boot device tripping commands, tripping, and banned generator connected to the LCI;

(2) when the LCI connection procedure, after the completion of a generator is connected to the LCI command. Check the generator no voltage and generator, the switch is off, after disconnect the generator neutral point grounding knife, and then close the generator static boot knife. LCI connection program finish thus, L3SS_CON buy 1. If a generator is connected to the LCI command of connector can not be completed within 30 s, emit boot device tripping command, make L4T 1, tripping unit. The reasons for this situation are mostly neutral grounding knives or static start generator motor fault;

(3) when the generator is connected to the LCI program is finished, Mark VI control system run LCI l4ssrun = 1, torque command l4sstorq = 1 and LCI speed set point ss_ref_out = 23.3% to LCI, make LCI purging work (L83SS_PURGE = 1);

(4) when 11 min after the purging procedure, Mark VI control system run LCI l4ssrun = 1, LCI speed value to LCI ss_ref_out = 14.5%, but the torque command l4sstorq = 0, the purpose is to make the unit speed decreased, when the unit 13.5%, the rotational speed down to the ignition of torque command l4sstorq = 1, when the unit speed increased to 14%, Mark VI issue ignition command control system, make LCI ignition warming-up works (L83SS_FIRE = 1);

(5) when 1 min after the warm-up program, Mark VI control system run LCI l4ssrun = 1, torque command l4sstorq = 1 and LCI speed set point ss_ref_out = 100% to LCI, make the LCI works at full speed (L83SS_FULSPD = 1).

Figure 1 said LCI in purging work, ignition warm machine works, works at full speed when Mark VI control system of LCI run command control logic diagram;

Figure 2 shows the LCI in purging work, ignition warm machine works, works at full speed when Mark VI control system of LCI torque command control logic diagram;

(6) when the unit speed reached 85.5%, Mark VI control system run LCI l4ssrun = 0, torque command l4sstorq = 0 and LCI speed set point ss_ref_out = 0% to LCI, LCI at zero speed works (L83SS_ZERO = 1). Execute when the LCI operation logic l4ssrun = 0, LCI disconnect procedures, disconnect the isolation switch and LCI export knife;

(7) in the LCI disconnect after the program execution, a generator disconnect program command, disconnect the generator static start knife, then close the generator neutral grounding knife. If within 30 s of the isolating switch can't disconnect or neutral grounding knife cannot be closed within the 30 s, were issued a report to the police. If in the process of start unit trip, delay 0.5 s disconnect isolation switch, Close the neutral grounding breaker;

(8) static start knife disconnect, neutral point grounding of the generator breaker closed, EX2100 stop running after, generators disconnect procedures complete, L3SS_DISCON = 1, unit start-up process is complete.

3.1.1.3 LCI offline washing process control

Chose offline washing unit, to meet the offline after washing and LCI start condition, operation personnel in CRANK mode unit instruction, the Mark VI control system puts LCI offline water works. LCI offline washing mode control logic L4SS_W_WASH 1, issued on the LCI electrical command, in 6 kv switch and LCI export after completion of the isolation knife switch, implement the generator connectors, disconnect the generator neutral point grounding knife, closed static generator breaker. After LCI complete offline washing process connection program, according to the offline when water temperature difference between wheel, LCI is divided into two ways.

1.3.1 round between the temperature meet the requirements of offline washing, LCI in normal water works (L83SS_WW_RUN = 1) unit after the issue of the instruction L83SS_WW_RUN 1, Mark VI control system run LCI l4ssrun = 1, torque command l4sstorq = 1 and LCI speed set-point KSSREFWB = 18% to LCI, after completing the prewash and detergent spray after the first time, choose the LCI speed set-point for KSSREFWA = 14.5%, on the second cleaner spray, spray the LCI stop delay after the 120 s output, unit speed drops, began to soak process, in order to achieve better cleaning effect

Fruit. For 20 min, by performing a rinse procedures rinse of the unit. In the offline after the washing process, by offline washing command, stop the implementation of LCI disconnect procedures and generators disconnected, complete an offline washing process.Unit after the issue of the instruction L83SS_WW_RUN buy 1, if after this round of room temperature did not meet the requirements of offline washed again, then MarkVI control system run LCI l4ssrun = 1, torque command l4sstorq = 1 and LCI speed set-point for LCI KSSREF1 = 9%, higher speed in the direction of the 9% of the unit, after rising speed to the set value K14SS_WW_CD = 8%, LCI torque command l4sstorq = 0, when the rotation speed decreased to 7% LCI torque output again, speed stability of generating unit at about 8% for cold procrastinate, until after the temperature meet the requirements between wheel to perform normal offline washing process.

3.1.2 LCI fault protection

3.1.2.1LCI no output

Mark VI control system run LCI l4ssrun = 1, torque command after the 45 s l4sstorq = 1, unit speed is still less than 1%, is a static starter without output tripping command L60SSBOGTRIP = 1, the tripping of generating unit.

3.1.2.2 without acceleration protection

After the completion of the unit in the warm-up, LCI at the stage works at full speed, if the unit actual acceleration value is 0.05% less than the minimum acceleration/s, emit the unit automatically stop command L60PSNA_SD = 1.

3.1.2.4 permission levels unit occurred in the process of start the trip

Unit trip occurs L4 0, LCI switch to zero speed, l4ssrun = 0, LCI stop running, disconnect 52 ss, then disconnect 89 md, l4sstorq = 0, LCI stop output torque, disconnect the static start knife, close the generator neutral grounding knife, make the LCI in the start state.

LCI on startup process trip

LCI occurred in the process of start trip, make L4SST = 1, L4 = 0, LCI according to 3.3 LCI disconnect procedures.

3.1.2.5 normal boot up difficulties in the process of protection

During the process of normal boot up stage (except purging time L2TV = 1 to send end of ignition command phase L14HMZ = 1) difficulty in acc, namely the current speed is less than the unit start-up process has been to 5% of the maximum speed of more than 1 s, emit tripping command unit.

3.1.2.6 fault generator linker

When the unit normal boot and water appeared in the process of connecting to the application of neutral grounding knife can't disconnect or static start knife cannot close fault, will make the trip, and perform the LCI disconnect procedures and generators disconnected, back to the start state.

3.2 the generator cooling system

This generator is GE production hydrogen cooled generator, with hydrogen on the rotor and stator cooling, at the same time with the foreign water through the heat exchanger of airtight hydrogen cooled generator rotor coaxial installed on both ends of the fan blade with the rotor high-speed rotation, airtight hydrogen forced circulation within the generator. Generator on each side to decorate the two vertical heat exchanger for cooling hydrogen.

3.2.1 the generator hydrogen system of mechanical structure

The generator hydrogen seal USES a double sealing ring structure. Sealing ring and the clearance between shaft only 0. 076 ~ 0.381 mm. Seal oil from the middle into two layers of sealing ring, from both ends of high-pressure hydrogen contact with generator at one end of the tube, the oil return clearance is small, plus an oil baffle can also reduce the oil flow. And seal oil pressure and differential pressure of the hydrogen pressure basic constant (usually in 38. 5 ~ 49. 0 kPa), thus to keep the stable flow field, also keep the stability of the seal. The other end of the contact with outside air, oil return gap is bigger, so a large number of the seal oil from the oil return air side. Basic constant due to the atmospheric pressure at the same time, the seal oil pressure with adjusted within the generator hydrogen pressure, so the generator within the higher the gas pressure, the greater the pressure difference of oil return air side, also means that the amount of oil return air side, which resulted in increased seal oil flow.

3.2.2 generator hydrogen seal oil supply and oil return

Gas turbine generator seal oil and lubrication oil for the same, so share a tank. Gas turbine with two ac lubricating oil pump, 1 dc lubricating oil pump, 1 ac seal oil pump and 1 dc oil pump seal. Because the sealing oil system of a lubricating oil pump outlet pressure is higher than demand pressures (49 to 490 kPa), so as long as a normal runtime communication lubricating oil pump can ensure that the lubricating oil and seal oil supply. From the mother lubricating oil pipe can supply all the way through the pressure regulating valve sealing oil system. When the lubricating oil system has low oil pressure signal will start the communication standby lubricating oil pump, if the low oil pressure signal to the dc lubricating oil pump. Lubricating oil of low oil pressure signal is still higher than seal oil demand pressures, so generally low oil pressure signal will only start the standby lubricating oil pump. But if decreasing oil pressure to the sealing oil low pressure signal, ac seal oil pump will start. If still cannot meet the demand of seal oil pressure will start the dc oil pump seal. In ac/dc oil pump logically under multi-level protection, gas turbine generator seal oil supply will get maximum guarantee. And seal oil supply comes from the lubricating oil, oil seal oil is also associated with the oil of lubricating oil. Oil return air side of the seal oil directly to the lube oil foam box, while the hydrogen side of the sealing oil oil return to pass a special seal oil float oil return valve (float t rap) back to lubricant oil foam boxes

3.2.3 generator sealing oil auxiliary equipment

(1) the sealing oil pressure regulating valve module

Hydrogen cooled generator in normal operation, the internal temperature and pressure with hydrogen generator load changes, and because the hydrogen must keep certain metabolic rate rather than the 100% of the seal loop, so the gas pressure inside the generator is relatively stable. In the generator internal gas displacement, the nature of the internal gas and pressure there will be a significant change. As a result, the dynamic variation of the pressure to the security and stability of hydrogen to seal in the generator, we must make the seal oil pressure changes over the hydrogen pressure, maintain a constant pressure difference. GE gas turbine generator seal oil pressure is accomplished by the diaphragm type pressure regulating module, by purely mechanical differential adjustment to achieve purpose. Seal oil pressure through the generator seal oil pressure and oil seal oil pressure regulating valve after pressure to the pressure regulating valve diaphragm to comprehensive regulation. Oil seal oil pressure and the gas pressure inside the generator is the same, the pressure regulating valve after pressure is the oil inlet pressure sealing ring, both through the pressure regulating valve to adjust and maintain a stable pressure difference, also means that the sealing ring of the generator also remain stable pressure difference. The pressure difference of the set value by adjusting the diaphragm pressure regulating valve spring fastening bolt to fix. Multiple gas displacement, and the long time running experience shows that pressure regulating valve regulating performance of the rapid and accurate.

(2) the sealing oil float oil return valve

Oil seal oil, there are two way, oil return air side of the seal oil directly to the combustion engine lubricating oil return pipe, and the hydrogen side of the sealing oil will be on a float oil return oil return valve. When the generator gas pressure rises, the sealing oil without differential pressure regulating valve will increase oil supply pressure and flow rate immediately. Floating ball valve back due to the internal gas pressure in the air pressure is equal to the generator, and after float oil return valve, the return pipe pressure to atmospheric pressure, so the generator pressure rise within said back to the oil pressure difference, in the same back to the throttle opening next oil flow quantity is big. And under the condition of the oil return ability is insufficient, floating ball valve oil level rise to make the back to the throttle opening, increasing oil amount back. In general, float oil return valve of the oil level is normal, said for the sealing oil system of a normal oil return system; Abnormal oil level increases, the said gas pressure is low in the generator, this usually occurs within the generator below 14 kPa pressure, at this time back to the oil pressure difference is not enough to overcome frictional head loss and height; The cause of the oil level is low are often not because of high gas pressure in the air generator, but the interior of the float oil return valve mechanical problems, needs to break up.

(3) foam box (Enlargement)

On the whole system consists of two foam box, a collector side, another on the turbine side. When after generator sealing ring, sealing oil in the tubing will be after defoaming box. Foam box is actually a flash tank, by increasing surface area to make hydrogen bubble left seal oil.

(4) hydrogen metabolism

Although within the generator hydrogen on sealing oil system and the atmosphere, but the long run will continue to reduce the purity. To keep within the generator hydrogen purity, you need to keep certain metabolic rate, hydrogen by some low purity hydrogen vent, add new high purity hydrogen to maintain the generator of high purity hydrogen. The purity of hydrogen in the system of the lowest places on the two side of hydrogen seal oil oil foam box, so both defoaming box with metabolism of trachea. During normal operation, if the purity is reduced, will automatically open the electromagnetic valve will defoaming in low purity hydrogen vent, operation personnel, of course, can also open the manual bypass to manually emptying.

(5) liquid level monitor

GE hydrogen generator has two with floating ball connecting rod trigger signals of liquid level monitor, a set of monitoring of generator electrical side back to oil defoaming tanks level, if the seal oil pressure is too high, the foam level in the rise, more than liquid level monitor sampling mouth will flow in the low liquid level monitor through a pipe. When the liquid level monitor is triggered when the transmitter level rose to a certain height, the MK VI will send alarm signal. Another liquid level monitor to monitor the oil level inside the generators, opening at the bottom of the sealing ring of the hydrogen side of the generator, if the seal oil pressure is too high, have the sealing oil leakage into the generator, is through the pipe into the liquid level monitor, when the liquid level monitor level rose to a certain value, the trigger transmitter, sending high liquid level alarm or liquid level alarm. The first liquid level monitor was installed on the collector end only foam box, because two foam box by return pipe connected, is a liquid level, etc.

3.2.4Hydrogen cooled turbo generator vertical cooler

The project adopts continuous hydrogen surface cooler, cooling water circulate in two or more channels in the pipe, flow mode is determined by the water tank layout. The cool gas flows through the above pipe bundles according to gas flow in the water. Hydrogen cooling generator is composed of four parts, the airflow in the airtight generator shell body should be placed symmetrically. The four part pipe connected in parallel.

3.2.5 generator excitation device

1bush holder device

The brush holder device is using the constant voltage type brush holder, disc springs pressure increase with brush wear, always maintain a uniform pressure on the top of the brush. Disc spring permanently installed on the supporting plate, . On the supporting plate it is also provided with a separating clamp, and contact brush lead terminals. Each provide a separate insulated handle, used for assembling and dismantling brush supporting plate and spring assembly.

Replace of bush.

(1) The insulated handle is used for disassembly and replacement brush; press the handle to release the brush holder. Ensure that the handle of replaced bush and other device is clean and dry .if do like this, there will be a risk of severe shock.

2

In the maintenance of brush and collector ring, something fall into the brush device or rotating collector ring and fan parts of any metal objects (watches, chains, etc.) or other objects. In addition, in dealing with a brush, prevent hand contact with brush device with no intention, suggestion wear specially designed rubber gloves for working in electrical equipment. At runtime, according to the design and working for brush device, the voltage could be changed within 200 to 750 VDC. if possible, when working in electric collector ring parts, use a hand. If brush component need to be further installed, use your other hand on insulating rod or flat steel.

(3) Only be used with special provided brush holder and spring. Don't put the constant voltage type brush and other types of brush.

(4) Brush should be placed vertically on the surface of the collector ring, there is 0.12/0.18 "[3.1/4.6mm] gap central in the brush holder middle measurement. Firmly brush is fixed on the holder.

5) Before Brush installation, brush holder is vertical placed on the surface of the collector ring. Any bush holder adjustment would affect the brush and collector ring contact.

(6) the number of installed brush within 24 hours is not more than one collector ring and brush to 25% of the total, so that the brush and slip ring surface grind well.

2 abnormal phenomenon during operation of brush

A. the most serious problem is the ring fire in the collector. The ring of fire can seriously damage the slip ring and brush holding device. Good measures can avoid the ring fire by using the correct maintenance. The ring fire condition is gradually developing. the arc jumping gap increases to the arc breakage and opening magnetic field circuit, the serious arc jumping sometimes last a few hours, or even days. The reasons lead to the ring of fire accident, such as the brush wear, spring installed improperly (or damage), and severe vibration or slip ring contamination.

B The brush holder device inspection and expected brush wear is a function of many variables, such as brush material, collector ring material, spring pressure, the field current load, cooling air temperature, collector air channel cleanliness, the number and types of pollution in the air cooling, slip ring surface, the slip ring, brush the vibration amplitude and polarity frequency, running speed etc..

C. The excessive vibration of collector will cause vibration, brush arc jumping and ring of fire. Therefore, it is very important for some special brush monitoring vibration amplitude and frequency. In general, the collector ring slowly wears a series of peaks and valleys among different brush slide. If the brush vibration increase excessively, if not corrected, result in the ring of fire.

3 Inspection during generator running or shutdown.

1 daily inspection

Go to daily inspection by the window of housing or housing door.

a. Check the bush spark. If only a brush spark, sometimes can remove the bush through the additional pressure to the brush . If this is not successful, remove the support plate and the spring assembly of the electric brush, carefully check whether all parts is damage, wear or foreign bodies or not.

b. Replace the reached wear limit brush. When the brush top edge gap (located in the brush side)is in 0.12 to 0.25 inches, the brush should be replaced. Under normal circumstances, positive brush wear speed is more than negative brush .

C. Check on dust or oil accumulation.

D. checks brushes and spring on vibration

E. check the brush plait,on abrasions,on blue or on burn.

F. checks the hardware without fracture or loosening.

G. check the collector ring surface states no remarkable variation.

H. compared with the previous inspection noise, no obvious increase or change.

I. monitor the generator field temperature , voltage or current collector from the control room, under similar loading conditions , check no change in temperature rise. Magnetic temperature readings instability may indicate that the collector ring has jump arcs signs.

(2)check weekly

Combined with the typical daily check, at least once a week, open the cover shell doors, sufficiently complete the following check.

notice:

If the conditions is permitted, often open the cover to check , such poor visibility or quick bush wear.

a. Records the vibration level for each collector ring. Draw the long-term vibration graph to identify trends and change. Check the brush holder component vibration level .If vibration is more than the recommended limit, it should be corrected.

b Check the brush no pit, shipping, grooves or thread on the detached bush from a collector ring. After that, reinstall the bush and examination the axial position on the collector ring.

C. check the bush in the bush holder by seeing, make sure that the bush not hang in the bush holder , if not sure the bush position , disconnect the bush one by one , check the bush is good, then reinstall the bush.

D. check clean air filter pipe is clean, also check the air filte not blocked.

4 EX2100 excitation control system

1system brief introduction

In #1#2 gas turbine, the excitation power is from the excitation transformer which is installed after generator outlet CB. In #3 steam turbine, the excitation power is from the excitation transformer which is installed before generator outlet CB. Stator current and output voltage is the main feedback to excitation device, the DC voltage and current output to the controlled variable of generator winding.

Control of excitation system is composed of SCR (semiconductor controlled rectifier) and phase control rectifier circuit. The trigger signal SCR is generated by the controller of digital regulator. In the redundant control options , M1 or M2 can be as the main controller and C can be in monitoring the two main controller, decide that one should be the main controller work, and the other is backup. Two independent trigger circuit and automatic tracking using ensure the smooth switching between main and backup controller

EX20100 hardward contain the following three cabinets:

Control cabinet is used for control, communication and I/O board.

The auxiliary cabinet is used for start excitation , protection circuit (field suppression and shaft voltage restrain )

Power rectifier cabinet is used for SCR element , cooling fan, DC contactor and AC isolator.

Power converter excitation device is composed of a bridge rectifier, a resistance capacitance filter and the control loop. The element and a rectifier bridge size change with the different excitation system and required different output power.

The following picture is the single line diagram of simplified excitation device, it show that the power, voltage and current measurement, control module, power module (PCM), and the protection circuit. In the power system, PPT (power rectifier transformer) secordary side received a three-phase full wave inverse thyristor rectifier bridge. Reversible rectifier can provide forward and reverse force voltage in order to obtain the optimum performance. For load shedding and demagnetization, reverse force voltage provides fast response.

2 technical characteristic

EX2100 characteristic explain

power setting module(PCM)

single rated value

parallel rated value

force excitation requestDC 8000A , AC 1500V.at most 6 rectifying bridge.

Force excitation 30 sec under 40 and 150% design.

Power rectifying module (PCM)power supply

Power rectifying power frequency

start excitation power supply

Control powergenerator terminal

recombination power

600 or 1000V

3251KVA 3251KVA(1000V)

Three phase 50/60Hz

DC 220 current, the max 200A,continue 10sec

AC 240 or 480V ,auxiliary power

Two AC, or one AC and the other DC

15% rated AC, DC 220V, the max DC current 10.6A

3Excitation device hardware

EX2100 excitation device is composed of the following basic components

power rectifier module (PCM) and cooling fan

power rectifier transformer (PPT) ( the excitation device installment is sperate )

line voltage filter

shaft voltage suppressor

demagnetization module

diagnosis interface (Keypad)

controller and I/O plate

control power supply

Power rectifying cabinet

Power rectifier cabinet comprises a power rectifier module (PCM), the trigger pulse amplifier board (EGPA), three-phase power(PCM) from the excitation device external PPT. AC power supply is through three phase voltage filter in the cabinet.

manual AC switch

Manual AC switch device is installed between PPT secondary side and static excitation device. It is a casting box, three-phase, non automatic switch. It is a kind of isolation device with no load operation.

Power rectifying module (PCM)

The excitation device PCM comprises a bridge rectifier, the DC arm fuse, thyristor protection circuit (for example: buffer, filter and fuse) and arm inductance coil. In accordance with the requirements of the output power, rectifier bridge rating is different; the components are also different.

bridge rectifier

Each bridge rectifier is three-phase full wave thyristor, the bridge has 6 SCR (thyristor), as shown in Figure 3-2, and SCR is controlled by the trigger pulse amplifier board of excitation device (EGPA). The heat is cooled by the large aluminum cooler, discharge by the top of strong fan

bridge inductance coil and element buffer

The commutation inductance coil is mounted in the AC input SCR bridge arm, line- line buffers and line inductance coil together accomplish the following functions, prevent the misoperation of SCR.

Limit the current through the change rate of SCR, buffer conducting current.

Limit voltage change rate of SCR, in the element commutation process, limiting reverse voltage appears in the component.

SCR buffer includes a PRV resistor, limit the peak reverse voltage. If necessary, these resistors can be removed.

The three-phase input power is from the secondary side of the PPT, can directly be connected to SCR by an AC circuit breaker or contactor and a group of line voltage filter. Due to the reversible bridge design, bridge rectifier can provide reverse force voltage, which provides fast response for load shedding and deexcitation. DC current output of rectifier bridge is through a divider, in some designs through a contactor (41A or 41A and 41B both), connect the generator field winding. Fuse is used for protect SCR for overcurrent harm.

Shunt DC shunt provides feedback signal of bridge rectifier output current, the mV output signal is input to a differential amplifier EDCF board. The amplifier output voltage controlled oscillator frequency, it produces a signal to the control module through the optical fiber. The feedback signal of rectifier bridge output voltage is produced by the same method.

3-2 Trigger amplifier (EGPA)

EGPA board relate with the power rectifier bridge. EGPA from the ESEL board controller get the breakover command, on 6 SCR (silicon controlled rectifier) trigger pulse. It is also feedback of the conduction current ,it is also interface of rectifier bridge ventilation and temperature monitoring signal.

In the new excitation device, use RTD instead of Klixon switch for monitoring temperature. When the temoerature reach the alarm level in temperature (170F or 76 ), a temperature switch open, when the temperature reaches a trip level (1900F or 87 ), another opens. The two switches are connected to the EGPA board, when a switch is opened, a bridge over temperature alarm. If the two switches, a failure and tripping signal is coming.

Cooling fanSCR bridge rectifier adopts forced air cooling. According to the rectifier bridge ratings and redundancy requirements, use two to six fan. These fans are single-phase 115V AC power supply provided by the user. In a redundant applications, replace the running fan in the excitation device operation.Axiliary cabinet The auxiliary cabinet arranged beside the power rectifier, it contains generator protection module and provides a DC power supply. AC power supply filter, demagnetization, shaft voltage suppression, excitation module are installed in the cabinet.

EDEXfield suppression module

In the shutdown process, stored energy of in the generator field must be dissipated. In the normal shutdown, shutdown is operated by the operating personnel. Bridge rectifier is triggered in the delay limit conditions, before excitation contactor is open, there is enough time for the excitation current decay. In the abnormal shutdown (trip) process, excitation contactor is disconnected immediately. Stored in the magnetic field energy must be dissipated through other means

SCR field suppreesion module(EDEX)

In order to meet the fast demagnetization requirements, the device provides a SCR demagnetization module. In the EDEX module, provide a pathway triggered by SCR, let the excitation current by magnetic field discharge resistor (or inductive magnetic energy) consumption.

The magnetic module has two independent trigger control circuit, each control loop is activated by the parallel of bridge rectifier auxiliary contact and auxiliary contact of excitation contactor running state. These loops in any one can trigger the demagnetization of SCR .For the excitation system of large exciting current, magnetic modules can be connected in parallel.

shaft voltage suppressor

The AC voltage is changed into DC voltage by the static rectifier excitation system of, produce ripple and peak voltage in the excitation device. Due to the rapid rise and their fast decay, the voltage from the excitation winding is coupled to the rotor, this form a voltage between the axis and the earth. If not effectively control in shaft voltage, cause damage to the shaft and bearing. Shaft voltage suppressor is a filter, which the high-frequency voltage conducts into the ground.

Start excitation module

The excitation system has a start excitation module. It provides the initial excitation current and the establishment of the generator voltage. In the generator starting the program, if the DC starting system, provide the no-load excitation current about 10%-15%. If the AC starting excitation, the AC power supply is through a isolated transformer.

EXAMEGDMexcitation circuit earth detector

Generator excitation winding is insulation to ground. One point grounding in general will not damage the rotor. However two or more point grounding will cause magnetic and thermal imbalance and local overheating. This will damage the rotor forgings or other metal parts.

Excitation loop grounding detector is the function of detect grounding point in the excitation system.4Excitation device software

The excitation device software download and configurate from the toolbox (Toolbox), and exists in the controller. Software in the screen of the toolbox connects function block signal flow represented. The current and voltage of generator excitation and stator are measured, and input to the control system. In normal operation, is the choice of AC regulator..

From the PT (voltage transformer) and CT (current transformer) , the generator voltage and current is connected to the EPCT board, EPCT board's task is to isolate and specifications of the signal. The adjusted signal is sent to the controller. Software transform algorithm using these signals to calculate the system variables, for the use of regulator, limiter and protecting function. The output of this software includes the following.

Voltage amplitude and frequce from generator PT

Current amplitude from generator CT

Generator power

Generator reative (VARs), Q

Calculate the rotor speed changes from the acceleration power, it is used as a power system stabilizer (PSS) optional input.

Generator active and inactive current

Generator flux (V/HZ) value.

The voltage from the line PT.

The frequecny from the line frequency

the phase relationship between generator and transmission line PT the generator and line.

The output of the control software is triggering command, which is sent to the bridge rectifier to produce the excitation current. Each function block function will be presented in the following.

According to the parameters and conditions, The AUTO REF function block automatic voltage regulator (AVR) generate an automated (or automatic control AC) setting value. The input to the AUTO REF Raise/Lower (up / down) and other equipment from high speed data online, such as steam turbine control. The rate of change of the integrator will generate the setting value of output in a predetermined limits. The setting value and other auxiliary WXASP function in the stability and protection signals are combined, the formation of AVR function block reference value.

AVR setting EXASP

EXASP is a comprehensive function block, generatr AVR setting (reference input) and tracking value.,and then go to AVR function block, EXASP input is as following.

Stable signal from PSS function block

Output from AUTO REF function block

External testing signal

Protection signal from UEL function block

Reactive current input(feederback)

Frequency input(feeder((feederback))

Automatic voltage regulation-AVR

AVR function block keep generator teminal voltage stable, its setting is from EXASP, its feedback is generator teminal voltage, its difference send proportion integral regulator, then regulator generate a output signal. When AVR put into service , AVR output is to FVR directly .

Manual referenceMANUAL REF

According to parameter and site conditions, MANUAL REF block generate manual setting for FVR or FCR and input raising ro reducing message into MANUAL REF. which come from the other controller, such aa turbine control.Excitation voltage and excitation current regulation FVRFCR

Excitation voltage regulator (FVR) is a typical manual regulator and uses the generator excitation voltage as a feedback input. Although FVR does allow the excitation current as a function of excitation winding resistance varies, but the FVR is completely independent of over excitation limiter. FVR adopts the generator excitation voltage as a feedback; the setting value is from the MANUAL REF function block. Integral terminal restricted PI (proportional plus integral) controller generates the output. , In AVR mode, the output of the AVR without any conditions directly goes to the output of the FVR. In the generator operation the internal excitation voltage regulator loop, such as compound and some high ceiling voltage excitation, FVR get the setting value either from the AVR or from the MANUAL RER. .

Excitation current regulator (FCR) is a special manual adjustment, and uses the generator excitation current as a feedback input. Excpt for stable operation within the generator capacity, FCR generally supply instantaneous strong excitation ability between the high and low limit switch. Under normal circumstances the setting value is larger than expected excitation current , and the integral predetermined value is optional. The output of the FCR is maintained at the top value until enable (possible values) into true (actual value), which makes the output following the P+I (proportional integral) controller. The trigger command bridge rectifier is a small eithor FVR or FCR output. When the field winding temperature changes, to maintain a constant excitation current , manual regulator FCR is not standard.

low excitation limiterUEL

The UEL function block is a kind of auxiliary control, to limit the automatic voltage regulator at low excitation to reduce the reactive current (or reactive power). UEL prevents stability limit which is reduced to more than a small signal or stator core temninal heating limit level the excitation current of the generator. UEL is composed of the given value part and the adjusting part, two key input is the generator terminal voltage and active power.

Power system stabilizerPSS

The PSS function block provides an additional input for automatic regulator, improve power system dynamic performance. There are many different quantities that can be used as PSS inputs, such as the generator shaft speed, frequency, power, synchronous motor acceleration power, or above some combination . PSS is the use of multiple input, it adopts synchronous motor electric power and the internal frequency (which is similar to the generator rotor speed), in order to get a proportional to rotor speed signal generator. It is composed of acceleration power of the signal, and the torsional vibration attenuating. The input signal is measured by generator teminal signal , does not need the generator shaft rotational speed transducer. It does not need any external additional hardware.

5control cablinetThe control cabinet comprises a keyboard control frame, control power distribution module, the control cabinet and power supply, I/O terminal board.

In situ keyboard: start / stop command, regulator switching commands and regulator to activate commands can be issued from the keyboard, the keyboard also comprises a meter display, indicating the state of the system (such as MW and MVAR ), excitation current and excitation voltage regulator, and the balance. Diagnostic is displayed, such as maintentance and troubleshooting information system.

control modulThe control module is a VME frame, which can be connected to board I/O terminal board for cable. Compared with M1, M2 and C three controller, the frame is divided into three independent power supply area. Each controller is composed of the control and the I/O processing board. If the frame only consists of a M1 controller, it is a simple control system; if the frame including M1, M2, C all three controllers, it is redundant control system.

the control board and I/O processor board

Application Control Layer Module based on microprocessor, ACLA (application control level module) controller has a LAN Ethernet port.

Digital Signal Processor based on microprocessor, is called DSPX controller (digital signal processor).

Excitation device IS bus board (EISB) is used for optical fiber communication between the bridge rectifier feedback board for

The excitation device main plate I/O (EMIO) controls the control relay, and triggers the command to the ESEL board.

Exciter Selector Board (excitation device selection board) ESEL, distribution trigger from the main controller to the EGPA board.

button usage

The keyboard comprises a touch type button,that is used for numerical and control excitation device , menu Navigation (menu navigation) and Exciter Control (excitation device control) button.

Table 3-1 Navigationbuttonfunction

Display default status screen, it use digtal or bar graph to display 8 parameter,health cion provide excitation device statas message.

If press on menu screen(Menu selection), display main menu. If press on displaying status screen, display the latest menu. If press it on screen contiuouly , use up, down arrow to ajust screen s contrast.

Menu Navigation : use choicing menu one item.

If pres Menu contiuouly , ajust screen contast.

Input digital parameter : when edit one parameter, refer to 09etc.

Input optional parameter: refer to 1-n item choice.

Menu Navigation: press right button to display the next menu., press left buttion to display the old menu.

Input parameter: if edit one parameter, use to choice digital.

Input optional parameter or executive command: no function .

Menu Navigation : display the old menu on the menu.

Input parameter : display parameter.

Menu Navigation : display the next menu on the menu

Input parameter: accept editing parameter.

button fuction

reset fault

rapidly access comon comand

Choice auto mode (FAR ro AVR)

Choice manual mode( FAR or FVR)

Increase voltage : VAR and PF

Decrease voltage :VAR and PF

running

stop

Table 3-1 Exciter Control button

display screen reading

Status

Text and graphics display information by key board. It has two kinds of forms of the screen contents, by pressing the corresponding navigation button , statuts and menu to select.

Status screen (Figure 3-5) is the default screen after the excitation device power on. It adopts analog meter and the corresponding text to display the running parameters of the excitation device. access other status screen . (see Status screen)

Table 3-5 Stautus panel

Menu screen (Figure 3-6) provide based menu, the adjustment parameters, operation guide, and viewing the fault (see menu and select) access list.

Table 3-6 Menu panel

Excitation device Health and State icon continuously display on the display screen on the right side. They show that the excitation device function and its running state is normal or not. These icons are shown below, are displayed in 5 functional groups.

If need, change the display unit and display contrast.

Table 3-2 excitation device Health andStateicon

function groupiconindicationexplaining

Heart beat

COM normalActivities of the line (the center of it is up and down) indicates the existence of a communication between the keyboard and the excitation device.

COM abnormalIcon indicates the keyboard is trying to establish communication with the excitation device, but not yet established.

Control

auto modeajust generator terminal voltage

Manual modeajust exictation

test modeExcitation device is a diagnostic test

Fault State

Excitation device OKWhen no display mark, Excitatioin device is normal.

abnormal When the parameter be exceeded, icon display

Alarm When alarm is coming , icon display.

tripWhen fault is coming ,icon dispaly

Status

stopexcitation device can be stopped to run.

runuing excitation device is running

limitExicitation voltage is more than excitation current or V/HZ limiter and UEL limiter action.

off-lineExcitation device off-line

on-lineExcitation device on-line.

change displaying unit

The unit of measurement is to change the display type

1, from the main menu, select General Setup

2, select the Display Units (display unit)

3, select the display unit parameters and edit (see below)

4, highlight, and then select the display unit applicable

adjustment display contrast

adjustment display contrast

1, from the main menu, select General Setup

2, then select

A, Keypad

B, Keypad Function

C, Adjust Screen Contrast

The following screen display

3, press the Escape button, save the contrast values, and return to the previous menu.

Screen panel Status screen display up to 8 variables (parameters). The first two parameters is based on display the text and analog meter . Table 3-3 provides bar graph properties of these parameters.

meter reading

When a variable is greater than +100% or less than -100%, the bar chart expressed as Over Range . Over range mark use bar charts line representing in +100% and -100% .

table 3-3 The status screen analog meter characteristics (default)

bar chart variabledigital dispalyunit of bar chart

DC bus VOL

AC current DC bus VOL amplitude(FVR feeder)

AC current amplitudeI-Mag-FilDC VOL pu value percentageV DC-PUAC Max current percentage

Screen stauts switch I/O displayThe keyboard has a Alternate status screen, it is used to display the general input and output state. To switch between the main status screen and I/O screen, press any of the arrow button.

every grade of circle indicates the corresponding I/O point state, as shown below:

menu usage Enter from the keyboard to the main menu screen to the other menu screen, on the menu screen, examine and modify data.

You can access the main menu from any screen, its operation is as follows

in the menu screen, press the Menu button (menu)

In status screen , press the Meun button one time ro two times

notice :different product has different menu choice.

Using the Navigation (guide) button, select the item in a menu, move and adjust the value:

Press UP or DOWN arrow button ,light and move between meum

Press Enter button, select a light item.

Return to previous meum, press Escape button, left arrow button or operation guidance

a meum content is more than a screen.

Light at the end of screen, press DOWN arrow, return to the next page.

If reach the end of meum, press DOWN arrow, return to the first page.

review fault and reset

When the screen indicating a trip or an alarm event (see screen reading), you can access information and reset (remove) the current fault, its operation is as follows:

a

Select Fault List from the main menu (fault list), then select Display Active Faults (display an existing fault). The following screen will be displayed.

Refer to a specific detail, select the fault (listed in the Active Fault Display screen).

displaying is as follows.

b Use below two mothods to reset fault signal.

Choice Reset Fault now Press Reset Fault button

Fault history is to consult the excitation device (a previously cleared fault and fault reset records)

Choice Fault List from the main menu (fault list), then select Display Fault History (display fault history)

6Exictation system operation provision

A. microcomputer excitation regulator (AVR) has the following functions:

A.terminal voltage regulator is usd for PID controller in automatic mode.

b. excitation current is used for PI controller in manual mode.

c. inactive / active current phase compensation;

d. maximum current limiter;

e. maximum excitation stator current limit;

f. minimum excitation current limit;

g.V/HZ limits;

h. automatic manual tracking control;

i. constant power factor cos or constant power free (Q) regulator;

j. excitation time monitoring function;

k. loss of excitation protection;

l. rectifier temperature monitoring and protection;

m.thyristor breakover condition monitoring;

n. main power supply voltage monitor;

0. auxiliary power supply voltage monitor;

p.PT breaking;

q. power on self test;

r. program watchdog;

s. fault recoB.UNITROL-F series microcomputer AVR shall meet the following technical indicators

a. I/O interface provides 16 digital input channels and 18 road, also provides 2 analog input, output channel.

b. pressure range is 1% ~ 130%.

c. voltage regulation accuracy is less than 0.5%.

d. the response time of AVR 20ms.

E.communication use RS485, baud rate is 9600bps in the local control panel

operation instructions

For EX2100 series microcomputer AVR device, many commands is using the local control and remote control. Operating instructions and return signal

control order(button or contact)Sigal indication

Excitation ON excitation light on

Excitation OFF excitation light off

AUTO ON auto mode light on

MAN ON manual mode light on

RAISE setting max light on

LOWER setting min light on

IMPACT ON Constant Q/costant Var mode light on

(IMPACT OFF) Constant Q/costant Var mode light off

a. excitation on /off

Press excitation on button to start excitation equipment, and then increase the excitation to make the generator voltage up to the rated value.

Press excitation off button to stop excitation equipment,normal operation procedure : Excitation system is entering SCR inverter mode, make generator field suppression. After delay 60S ,close thyristor trigger pulse, if the parameter RELEASE FCB OFF is set to YES (1), at the same time FCB are opened automatically.

b. auto mode and manual mode

The automatic mode is the regulation of the generator terminal voltage constant, while the manual mode is to maintain a constant excitation current. The two kinds of operation mode can be switched by the automatic mode and manual mode button button.

when the automatic mode of operation fail, automatically switch to manual mode of operation, only switch back to the automatic mode operation after fault elimination . In order to ensure no impact switch, AVR is equipped with automatic tracking function, when allowed light (READY FOR CHANNEL SELECTION) is on, ensure switching operation is no impact.

The manual mode is used as a standby operation mode; it is used mainly in the equipment debugging, maintenance and fault, so required by the training of operating personnel to manage. In the manual operation mode, low excitation limit and V/HZ limit still play a role.C. constant COS /Var input / quit

When the excitation system is in automatic mode and generator is connected to power grid, choice putin or quit the constant power factor / constant reactive power mode, which change the parameter settings by maintenance personnel.

D. increas excitation / decrease excitation button in the automatic mode, the manual mode, constant power factor mode and constant reactive mode can be used to change the set value.A) In automatic mode

Increasing excitation / decreasing excitation command is used to regulate the generator voltage setting value, change the terminal voltage on no-load operation and change reactive power on load operation. The various limiters will play a role in the protection of generator. When adjusting the settings to upper and lower limit, adjustment operation is invalid; the corresponding limit indicator light is on.

b) in munnal mode

Increasing excitation / decreasing excitation command also change voltage generator on no-load operation and change reactive power on load operation, but the operating personnel must ensure the adjustment operation shall not exceed rated values of generator, because the available limiter may be invalid in the manual mode . When adjusting the setting value is up to upper and lower limit, limit is no longer invaild, the corresponding indicating lamp light. When the generator main CB is open, start the excitation regulator to automatically set the excitation current for no-load exciting current If0.

e) Trip command: when an internal fault occurs (such as generator protection), automatic cut off excitation system, at the same time trip demagnetisation CB.

state and alarm message

FLELD BREAKER ON

FIELD BREAKER OFF

LOCAL

LIMITER ACTIVE ,OVEREXCITED

LIMITER ACTIVE, UNDEREXITED

ALARM MESSAGTE

READY FOR CHANNEL SELECTION

E . Safety operaton consideration matters

A) After debugging work is complete;

B) According to the maintenance plan for equipment maintenance regularly;

C) If any faults ocurrs, contact the maintenance personnel to deal;

D) All adjusted parameters must be checked and tested by the maintenance personnel, then be put into operation.

E) AVR is in the automatic mode normally.

F) Normally each bridge rectifier has a group of fan operation, if the wind pressure is low, switch to another group , at the same time alarm is sent.

G) during normal operation, the environment temperature should not exceed 42 . when the bridge rectifier temperature reach 52 , alarm is sent and limit the excitation current;when the temperature is up to 76 , trip the rectifier bridge .

H) during normal operation, in order to prevent the bridge rectifier temperature too high , the maintenance personnel regularly clean fan filter monthly not less than two times, if in the poor environmental conditions, clean fan filter once a week.

I) especially during the overhaul, prevent AVR loss the program because of long time power failure.

J) When terminal voltage is rated voltage, force excitation peak voltage and current reach up to 2 times of the rating, namely 604V, 5020A; force excitation allows for 20 seconds.

K) Normally use residual voltage excitation. In the proecess of the excitation, the silicon controlled rectifier input voltage as 10V-20V can work normally. if the voltage is lower than 10V-20V, silicon controlled rectifier will be constantly triggered (diode operation mode), after the specified value is reached, switch to the normal way. If in a few seconds residual voltage excitations fail, you should start standby excitation loop. On the generator terminal voltage reaches 30% of the rating, when the standby excitiation circuit automatically exits, the soft excitation will be started to build voltage to a predetermined voltage level; the excitation voltage and sequence control is realized by AVR software.

L) Excitation regulator has the function of automatic tracking, switching is without disturbance between automatic and manual switch, check reactive power no fluctuation.

F. Excitation system inspecton and maintenance. a. inspection before input

* All maintenance ticket of excitation system has been terminated, equipment acceptance inspection has been comleted, then transfer to the operation and put into operation;

* Temporary safety measures on excitation system has been dismantled and recover

* Control power of demagnetisation switch and regulator is normal

* Excitation system on alarm and fault signals

* Excitation system switch to automatic mode

* Under generator no-load condition, all input and output parameters of the excitation device is normal

* Check excitation systme be put into operation after the control cabinet door shut.

* Excitation system equipment isclean and in good condition, the connection is firm, no short circuit and grounding phenomenon.

* the slip ring sealing cover, the sealing door and peep hole are intact

* The brush holder, brush brush and slip ring of grounding detection device is intact, contact should be good; carbon brush is not too short and jam phenomenon, consistent with the operating conditions

* After generator constant speed, checking the no-load output voltage is normal

* each parts of excitation transformer is intact, in accordance with the running conditions

The generator slip ring and the brush braid is intact and good contact, copper braid is arranged neatly

b. Inspections check

* Limiter is without action signal;

* Excitation current, voltage and reactive power is stable,

Excitation cabinet inspection is normal:

* Excitation device is no any alarm signal and no abnormal noise, the meter display normal;

* Excitation device in the automatic mode

* check the regulator cabinet, rectifier, arc lamps, cabinet indicating switch, switch , the running state of device and the switching channel indication is no fault, no alarm and other phenomena;

* fuse temperature of regulating cabinet is less than 80 , the cooling fan is operating normally, the control panel is no alarm.

* During the operation of excitation device , it is strictly prohibited to open the doors,when the excitation is put into standy, check excitation device door close.

* Ventilation was no abnormal noise and smell;

* Air conditioning in excitation chamber is normal;

C. excitation transformer and slip bush inspenction

* Excitation transformer operation is normal, no abnormal sound;

* check the excitation transformer temperature detector in normal operation, temperature display normally;

* check whether the operation of the cooling fan is normal or not, put control into automatic condition (100 start, 80 stop);

* check the excitation transformer temperature is not higher than 100 , when reaching 110 , temperature high alarm is coming.

* check the temperature of the slip ring, brush the intact, slip ring and brush is normal, no overheating and other abnormal phenomenon, copper braid is arranged in neat rows, joint is without overheating.

G generator operation regulation

G.1 the regulation about generator rated operation .

G.1.1 In accordance with the provisions of generator manufacturer nameplate data , called the rated operating mode, in this mode, generator can be long-term continuous operation.

G.1.2 generator is not allowed to run with air cooling.

G.1.3 generator neutral grounding switch must be closed and locked.

G.1.4 generator does not allow running without excitation.

G.1.5 after a new installation or maintenance for generator , the insulation, protection and automatic device must pass the test, then generator can be put into operation.

G.1.6 after a new installation or maintenance for generator, if the protection test and air tightness test is unqualified , it is strictly prohibited to put generators into operation.

G.1.7 after generator connect to power grid , taking the load or increase or decrease the load can be adjusted according to shift-operator command , on the base of the dispatcher issued load curves, shift-operator adjust power load.

G.1.8 After generator connect to power grid, stator current can take 50% of rated current. The speed of up to the rated current should be uniform, the time is not less than 1 hours. When the unit is in standby state or fault condition, stator and rotor current increasing rate is not restricted. The generator take load speed rate depends on the gas turbine running state.

G.1.10 in the process of increasing load, strengthen the generator, the exciter coil, iron core, coil, excitation transformer, iron core ,the generator inlet or outlet air temperature, the slip ring and brush monitoring.

G.1.11 the vibration (bidirectional amplitude) of generator vertical and the level direction is not more than 0.03 mm, the axial is not more than 0.038 mm, the bearing vibration should not exceed 0.1 mm, if exceed the above value, promptly report shift-operator, notify the professional engineer and maintenance personnel, check the vibration reasons and eliminate it.

Adjust reactive power according to shift-operator command, according to reactive power curve, which the dispatch issue. Because the power grid has idle reactive to make voltage high, adjusting reactive power of generator phase lag operation is invalid, report shift-operator and the dispatcher , according to shift-operator command ,generator reactive power is from phase lag operation to phase lead operation, adjust the voltage curve within the prescribed scope, the specific implementation according to "the generator phase advance operation regulations" implementation.

G.2 Temperature and pressure provision of generator rated operation mode.

G.2.1 Provisions of the generator and excitation temperature

1), generator inlet air rated temperature 46 , inlet air minimum temperature 40 , inlet air maximum at 48 , relative hydrogen humidity is not more than 0.2g /m3. the generator inlet air temperature minimum is not less than 40 degrees to prevent condensation, when the inlet air temperature over 46 , generator load should be reduced accordingly.

Unit parameter value is shown in the table below.

The generator inlet air temperature and load current comparison table

inlet air temperature4046485053

A load current1305812432120591156110815

Increase and decrease ratio +5.0403.07.013.0

2), The range of generators inlet air temperature is 46 48 , when increase 1 , stator current permissible value is less than 1.5% of the rating., when increase 1 in 48 ~ 50 , stator current permissible value is less than 2% of the rating. In 50 ~ 53 , when increase is 1 , stator current permissible value is less than 3% of the rating. When the generator inlet air temperature was 40 , stator current can be increased to 13058A, if the inlet air temperature continue to decreases, the current value will not increase. When the temperature exceeds 46 , monitor the temperature of each part of generator shall not exceed the specified value.

3) Generator hydrogen cooling rated temperature is 46 , the minimum temperature is 40 .When local hydrogen cooler outages, cold hydrogen allowed the maximum temperature is 48 , cold hydrogen temperature alarm temperature is 50 . The outlet temperature between hydrogen cooler interaction should be balanced in the run, in any case air temperature difference should not exceed 2 .

G.2.2 On generator full load operation, the temperature on the CRT monitors does not exceed the following values:

1)inlet air temperature of the generator stator windings is not higher than 46 , monitoring temperature rise is not more than 84 , the maximum allowable temperature does not exceed 130 .

2), the generator stator core inlet temperature is not more than 46 , monitoring temperature rise is not more than74 , the maximum allowable temperature does not exceed 120 .

3), the generator rotor inlet temperature is not more than 46 , monitoring temperature rise is not more than 64 , the maximum allowable temperature does not exceed 110 .

4), the hydrogen cooler inlet temperature should be maintained at 15 35 ,ensure cooled hydrogen temperature 46 . Hydrogen dryer should always put into operation.

5) Hydrogen cooler water pressure shall not exceed 0.8Mpa. Hydrogen cooler water temperatures generally does not allow more than 35 . If more than 35 , the generator hydrogen cold temperature and the core temperature does not exceed the specified value, allow to take full load. At this time, strengthen the generator hydrogen cold temperature and the core temperature monitoring.

6) The hydrogen pressure is 0.31Mpa, the power factor is 0.85, the unit is under the rated conditions, if 1/4 hydrogen cooler exit operation (not at the same corner), allow to take 80% load, if exit operation ( at the same corner), allow to take 60% load.

7) Rated air inlet temperature of excitation slip is 45 , the minimum inlet temperature is 40 , the max inlet air temperature is less than 50 . The slip cover temperature is higher than the ambient temperature of 5.5 11 so as to prevent cover condensation, maintain the relative humidity is less than 30%, bearing temperature is less than 90 3)The surface of generator slip is not more than 100 G.2.3 operation regulations for the generator voltage, current, frequency and power factor :1) Generator stator voltage allowed value changes range is 5%. The power factor is rated and its rated capacity is unchanged, when the generator voltage is lower than 95% of the rated value, the stator current long-term permissible value shall not exceed 105% of the rated value.

2) Generator stator highest voltage may not exceed 110% of the rated voltage, the lowest voltage should generally not be less than 90% of the rated voltage, meet the voltage requirements of power plant.

3) Generator normal operating frequency should be maintained at 50HZ, the permissible value is in the range of 0.2HZ, at that time generator continue to run at rated capacity. Frequency changes, stator current, excitation current and temperature in each part shall not exceed the limit value.

4) At rated load, generator power factor is 0.85; the AVR device is in automatic mode, power factor is allowed to run in the phase lag 0.95 for a long time.

5) When generator is under overload operation, generator power factor shall be not less than 0.9, stator current and rotor current does not exceed the rated value, the excitation voltage is more 16 V than the rated voltage .

6) On generator normal operation, three phase stator current should be equal. When the three-phase current is unbalance, each phase current difference should not exceed 10% of the rated value, and the current of each phase shall not be greater than the rated value

G.3 generation special operation mode

G.3.1 The generation leading phase operation provision:

1) Generator leading phase operation should be based on reactive power curve or command by dispatcher .

2) On Generator leading phase operation, especially closely monitor the generator stator winding and core terminal, teeth, yoke structure temperature and other parts of changes in temperature, the temperature must not exceed the prescribed value.

3) On generator leading phase operation, monitor 6.6KV voltage change, ensure safe and reliable operation of the system in 6KV plant system. bus voltage has been reduced to 6.0KV in the 6KV plant , but has not reached the depth limit of generator leading phase operation conditions, the unit improve 6.6KV bus voltage by transformer OLTC, enhance generator leading phase operation depth, so as to meet the needs of the grid voltage adjustment; at the same time, maintain 6.6KV, 400V busbar voltage in the normal range; the unit no longer deepened generator leading phase depth operation, maintain this operation, timely report to the relevant leaders shift-operator, and dispatcher .

4) On generator leading phase operation, when switching over in 6.6KV service power , monitor the 6.6KV standby power supply voltage be consistent with working power supply , ensure 6.6KV service power switch over safety.

5) In the process of generator leading phase operation, abnormal phenomenon should be stopped immediately and report the relevant departments, inform maintenance personnel to check and eliminate it.

6) Record the leading phase operation start time, end time, the temperature changes, 6.6KV service voltage changes.

7) Microcomputer excitation regulator is set for low excitation limit curve and the corresponding low excitation protection line. Power factor, temperature in each department of generation shall meet the conditions according to the actual ability of generator leading phase voltage .

8) under normal circumstances ,the depth limits of generator leading phase operation is set in the scope of low excitation limit curve and low excitation operation line; when active load reach rated value, generator leading phase operation depth is keeping in the scope of -40MVar , the stator current should not exceed the rated current, power factor COS > 0.98 (lead). When the generator taking active load < rated load, can enhance the leading phase operation of depth, but must meet 1.2.19

generator leading phase operation depth adjustment should meet the following four conditions:

(1) Meet the low excitation limit curve setting range;

(2) Meet 6.6KV service power is not less than 95% of rated voltage (6.6KV) limits;

(3) Meet power factor range is between 100% and 95%;

(4) Satisfy the generator each point temperature does not exceed the specified value.

10) changing the established low excitation limit operation curve, must be approved by the chief engineer , then low excitation limit curve setting changes can be adjusted, the work required a detailed log ,then hand over to operator .

G.3.2 Generator peak load regulation operation mode:

1) Unit has peak load regulation ability, normal operation can be implemented according to the needs of power grid peak operation load adjustment.

2) On unit peak load operation, operators can perform the active load curve, which is received from the dispatcher.

3) On unit peak load operation, closely monitor the generator stator winding and core end, teeth, yoke structure temperature and other parts of the temperature change, timely adjust the generator air temperature according to the load change, seal oil temperature is with the specified value.

3) Unit peak load rising, reducing the load should be carried out slowly, ascending and descending load shall be not more than 3MW/min.

4) Each peaking load operation should be recorded.

G.3.3 The provisions of primary frequency control operation mode:

1) The dispatcher is in charge of unit primary frequency regulation function, shift-operator should strictly perform the command in accordance with the requirements of the grid

2) shift-operator completes unit primary frequency regulation command, timely report the relevant leader and the dispatcher, and then make a record.

3) Before primary frequency regulation function is in service, shift-operator should contact C&I engineer to check the relevant parameters that meet the grid on primary frequency regulation technology requirements, before it can be put into. Technical parameter requirements are as follows:

1) dead area: controlled in 0.033Hz ( 2r/min), namely: 50.033 Hz 49.967 Hz.

(2) speed diversity factor: 4% 5%

(3) the maximum load adjustment limit: according to the rated output of 6% limiter.

(4) speed regulating system delay rate: less than 0.06%.

(5) use scope: units output range , when the unit output reach the upper or lower, unit should no longer perform primary frequency regulation function .

the response behavior

1) When the grid frequency variation reach primary frequency operate value, the unit load change time is required for an load response lag time, less than 3 seconds.

2) When the grid frequency variation exceed the primary frequency dead time , the unit should response the target output in 15 seconds .

3) when the grid frequency variation exceed the primary frequency dead time , unit output and unit response target deviation of the mean value should be rated output power of + 3% in 45 seconds

5) After the unit start-up and take the load about 220MW, check each parameters is stable (it is important for system frequency), report the dispatcher to put into the primary frequency regulation function.

6) The load is reduced to 180MW because of sliding parameter, the shift-operator inform C&I to quit primary frequency modulation function by the approval of the dispatcher.

7) After the primary frequency regulation function is put into service, operation personnel must strengthen the surveillance system frequency, and make the power frequency disturbance contingency foreseeing , do advance control, timely adjustment.

8) After the primary frequency regulation function is put into service, unit moment load fluctuate above 15MW,this is a threat to the safe operation of unit, shift-operator apply the dispatcher for quitting the primary frequency regulation function, when the grid frequency is stable, report the dispatcher .

Volume B Operation Procedure of Plant Electrical Systems (HTOM-E-02).doc

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Transcript of Volume B Operation Procedure of Plant Electrical Systems (HTOM-E-02).doc