燃机励磁开短路试验GenShortCircuitTestrev 3_hcs062605.doc

eENERGYSERVICESEX2100 & Generator test ProcedureGE Report Ref #:Rev.4CNTIC Wangting Power Station Page :8of8Made by Myungsoo,Jang/rev 4 HC Sanderson on June 26, 2005.General Electric International; IncStartup Section Electrical test1.0.0Recorded EX2000 Equipment Data1DM# : GR0901EX21002Shop Order# : 290T575Warm-back up3Site Name :Wangting Bundle buys siteDesign1.0.0Recorded Generator Nameplate DataTYPE390HSN #:180064981MVA:468PF:0.85NO. POLES: 2NO. PHASE:3CONN:WYEHZ:50ARM VOLT:19 KVARM AMPS:14221FLD VOLT:750FLD AMPS:2019TOTAL TEMPERATURE AT RATING:103CDEG C ON ARM BY DETECTIONGUARANTEED NOT TO EXCEED:120CDEG C ON FLD BY RESISTANCEMAX COLD GAS:DEG CINLET AIR:N/ADEG FINSTR: 1.0.0Estimated Generator Field DataOK1.Generator Field Resistance 125 C, Rf75=0.3737W2.Generator Field Resistance 25 C, Rf25=0.2698W3.AFFL=2019AMPS DC4.AFNL = IFG at No Load Rated Gen Volts=684AMPS DC5.VFNL 125 C = (AFNL x Rf 125)=255.61VOLTS DC6.AFSI=1322AMPS DC7.AFAG=603.2AMPS DC8.Xdv, Saturated Synchronous Reactance=2.19PER UNIT9.Xdv, Saturated Transient Reactance=0.225PER UNIT10.Tdo Field time constant at 125c open circuit=6.6SECONDSNotes1.For Copper: Resistance T2 2.PPT Secondary Volts: 11303.PT Ratio (VPTs): 19000/100 v/v, PT Ratio (XPTs): 19000/100 (v/v)4.CT Ratio: 18000/5 (amps/amps) 5.Field Shunt Ratio: 4000/100 (amps/mV)6.Field Flashing Shunt Ratio: n/aCustomer notice :GE does not recommend to perform the short circuit test. Generator was tested in the factory & is shipped. Here is the reason why GE does not allow for these tests.The three-phase short circuit test will heat up the stator winding. If the stator current exceeds rated values excessive heating could damage the stator and bus duct. If the 3 phase shorting bar fails, high stator currents will occur that cause large mechanical forces on the stator winding and possibly loosen or damage the stator end winding and bus duct. Also, rotor surface heating would occur due to negative sequence currents.The single-phase earth fault will heat up the generator rotor surface, neutral grounding transformer and resistor due to negative sequence currents. None of these are monitored areas. If the negative sequence current exceeds rated capability excessive heating will occur and could damage these areas. If the phase to earth shorting strap fails it could result in bringing in an adjacent phase resulting in high stator currents that cause large mechanical forces on the stator winding and possibly loosen or damage the stator end winding.The open circuit voltage test is more straightforward as it does not require any special test setup. However, if the stator terminal voltage exceeds rated values, excessive core heating and damage could occur.GE will not accept responsibility for ANY damage done to the generator or other auxillary equipment (relays, etc.) that might arise from this testing. Generator No load saturation curve test The following steps must be taken in Preparation for the Generator No load saturation curve test. It is assumed that all generator protection systems are operational including V/HZ and over voltage protection, it is also assumed that the PT feedback has been measured and is known to accurately reflect the voltage on the geneator stator. prepare Switch in series with 86G input signal from GP2100 to Exciter, in case the Ex2100 trip isrequired, the testing member can stop the Ex2100 by opening the switch. The machine has to be brought up to FSNL(3000RPM +/- 5 RPM). It is assumed that the Generator should have rated cooling gas(Hydrogen) on it during the test, the generator cold gas temperature at the test starting point and at the high point(1.05Pu) of the test should be logged to be sure where it is.Step 11) All the control powers on EX2100 should be turned on, this includes AC and DC control power for the controls, AC power for the blowers and power for the 41DC breaker closing and control circuits.2) Verify that both the primary and secondary blower motors are operational.3) PT & CT input Switchs including all the the protection systems should be turned on(closed).4) M1 and M2 files should be uploaded and saved for the test.5) Select the excitation control mode to Manual from the oprator keypad.6) Check 89ND closed and 89SS(VT) are opened.7) The TBN must be at rated speed for this test.8) VHZ and VHI including the OEL limit should be coordinated for this test ,the maximum operation voltage on the generator startor for this test is no more than 1.05pu.9) Change the follow settings on the software diagram10) If the Generator voltage is above 1.05 Pu, the test period should be within 30 Seconds, and then lower the voltage below 1.05Pu.Step 2 : Change the follow settings on the Ex2100 software diagram(MANREF) Manual function* whenever the test member change the settings for this test, make sure to use “Teach function” on the software so that all three cores recognize what we are doing and have the same information for this test.- a. “MAN REF OUT LOW LIM” from 129.156 Vdc to 0 vdc.- b. “MAN REF OUT UP LIM” from 829.95Vdc to 338Vdc, Explanation : the calculated current at 1.1Pu of Generator Terminal voltage is 787amps, the manual Maximum upper limit should be 787 * 1.15pu =905 amps, so the desired setting on MAN REF OUT UP LIM is 338Vdc(explanation : 0.3737 ohm(Resistance at 125 C) * 905 amps = 338 Vdc). The Reference for 290T575(Wangting Generator) from the Original Generator data (383A2026): At 0.8Pu of Generator voltage, IF(Field current ) is 530Amps, At 0.9 Pu of Generator Voltage, IF(Field current) is 602 Amps, At 1.0Pu of Generator Voltage, IF(Field current) is 684 Amps, At 1.05Pu of Generator Voltage, IF(Field current) is 732Amps, At 1.10 Pu of Generator Voltage, IF(Field current) is 787 Amps.- c. MAN REF PRECON VAL from 147.607Vdc to 10 vdc- d. MAN REF RATE from 5.83995 VDC/S to 2VDC/S,- e. check the Off-line OEL settings(OffLiOEPU: (820.8Adc=1.2pu), this setting value need to be changed to 910 amps just above the Manual Reference Upper Limit, also change the setting on “OffLiOEInf” from 855Adc to 930Adc) - f. Make a Preparation the chart recorder on the PT A-B, B-C, C-A of EX2100 PT S/W(Primary PT). Step 3 : Change the follow settings on the Ex2100 software to block the Control Mode from “ Manual mode” to “Auto mode”. - a. Go to the below section on the software(ACLE block), “E1”Advancedsettings”Functions”EX2100M1”V01.01.01A”Modules”SYS1” ”E1HBBF_ALT V02.01.01C”AUTO_MANUAL”- b. Force the signals “E1PTBADRST_FB” to “1” on “10_BENG” and “40_BENG”, Also force the signal”E1MANUAL_FB” to “1” on “120_BENG”,- c. Change Parameter “AVR OUT UPPER LIMIT” from “1” to “0” , Even If Auto mode is accidentally selected, the output will go to “0”. The signals above prevent the EX2100 control mode from being transferred to “Auto mode” from “Manual mode”.* with the connection of GSU(Generator Step-up Transformer) to Generator during the test, be aware that it will draw considerably more current than as it is going into Saturation at 1.09 Pu voltage, A few MW(Mega watts) of Power may be pulled into the GSU at 1.09Pu voltage.10) Keep the Communication cable(Ethernet S/W) from MKVI on ACLE of M1 and M2.11) With the TBN at FSNL, Start the EX2100 from the Keypad(FV:10VPreset, FI=37amps- 10V/0.269825degree C), A PT failure alarm is expected.12) Slowly increase Generator voltage using the “Raise”/”Lower” button on keypad, Keep increasing the field current monotonically. Dont allow it to be backed off slightly to reach a specific target terminal voltage level. 13) After the Generator voltage is reached up to 1.09Pu(20.71KVAC), lower the Generator Voltage to Zero14) Stop the EX2100 using Keypad.15) Turn off the Blower motor,16) Open the 52ET(PPT) breaker.17) Restore all the changed values(from Step 2 to Step 3) to the originals .* The expected data based on the curve/graph(DWG # 383A2026 Sheet 5)DataGen Volts (KV)If increasingVf increasingIf decreasingVf decreasing0(0 %)Cold FieldCold Field 1.9(10%)70183.8(20%)100267.6(40%)2506711.4(60%)39010513.3(70%)45012115.2(80%)53014217.1(90%)60216218.05(95%)65017519.00(100%)68418419.95(105%)73219720.52(108%)755203 20.71(109%)790213* Actual test recordDataGen Volts (KV)If increasingVf increasingIf decreasingVf decreasing0(0 %)1.9(10%)3.8(20%)7.6(40%)11.4(60%)13.3(70%)15.2(80%)17.1(90%)18.05(95%)19.00(100%)19.95(105%)20.52(108%) 20.71(109%)* Compare test data to calculated values to make sure if the test data is reasonable.* Customer reference *The customer should understand that during this test, the main unit step up transformer is connected to the generator output. This will cause the generator to require somewhat more field current than the published saturation curves due to the magnetizing current of the transformer, as a rough estimate, approximately 1.38Pu amps, field, Air Gap(AFAG) is required (At 3% stator current at 1.10Pu, the calculated current is about 833Amps, this is ablut 1.38Pu AG) .Generator short circuit test. Before beginning this test, all connections for applying the short circuit to the generator output must be completed, provisions must be made to ensure that the short circuit can not be disconnected for the generator during the test. It is also assumed that generator CT feedback are verified as accurate and that the stator current on the generator can be monitored accurately. The generator must be at FSNL to conduct this test, all changes to the software must be made after bringing the unit up to speed. For Wangting Short cuicuit test, the short circuit will be connected on the GSU(Generator Step-up Transformer), the impedance based on rating is 16.65%, the tap setting of GSU is 19KV(Low voltage of Main Tr) : 220KV(High voltage of Main Tr) , so at 1pu rated stator current, the field current is expected as below.(Xd + 0.1665)*AFAG =(2.19 + 0.1665)*603.2(AFAG) = 2.356*603.2 =1421.4 Amps. If the GSU is not in the short circuit, the fild current will be estimated by % AFSI, So at 80% stator current, the expected field current is 0.8*1322(synchronous impedance field current) = 1058AMPS with GSU reactance as Zero, So during the test of Generator short circuit by itself, at 1.0Pu stator current, the field current is 1322amps. 1) Change the follow settings on the software diagram(MANREF) * whenever the test member change the setting for this test, make sure to use “Teach function” on the software so that all three cores recognize what we are doing and have the same information for this test.A. Step 1. Manual function( MANREF) - a. MAN REF OUT LOW LIM from 129.156 Vdc to 0 vdc, - b. MAN REF OUT UP LIM (This is needed to be changed on the software) the expected field current with the connection of GSU for short circuit test is “1421 Amps” so (AFAG 603.2amps) * (Xd 2.19 + 0.1665) * 0.3737 125 temp so the expected field voltage =1421 amps * 0.3737 ohm = 531 Vdc, so change the upper limit to 587 or 590(1.1pu) - c. MAN REF PRECON VAL from 147.607Vdc to 10 vdc - d. MAN REF RATE from 5.83995 VDC/S to 2VDC/SB. Step 2. Change the follow settings on the Ex2100 software to block the Control Mode from “ Manual mode” to “Auto mode”. - a. Go to the below section on the software(EX2100 software “PVZ528” E1 file), “E1”Advancedsettings”Functions”EX2100M1”V01.01.01A”Modules”SYS1” ”E1HBBF_ALT V02.01.01C”AUTO_MANUAL” - b. Force the signals “E1PTBADRST_FB” to “1” on “10_BENG” and “40_BENG”, Also force the signal”E1MANUAL_FB” to “1” on “120_BENG”, - c. Change Parameter “AVR OUT UPPER LIMIT” from “1” to “0” , Even If Auto mode is accidentally selected, the output will go to “0”. The signals above prevent the EX2100 control mode from being transferred to “Auto mode” from “Manual mode”. 2) Change Parameter “VhiTripLev” from 1.2Pu to 0.6Pu, “VhiTripSec” from 2 Sec to 0.1 Sec.3). Change Parameter “OETripLev” from 2261.28Adc(1.12pu, AFFL: 2019 Adc) to the value(expected field current 1421 * 1.12), 1592 Adc. 4) Change Parameter “OETripSec” from 120Sec to 1Sec5) Change Parameter “OE_Pu” from 2059 Adc to 1449 Adc.6) On GP2100, disable the follow protections, - Loss of Excitation, Gen protection (40)- Undervoltage, Gen protection (27)- Voltage Transformer Fuse Failure, Gen protection (VTFF)- Out of Step Relays- Breaker failure relays should be coordinated to prevent the plant power from being Black-out. 7. prepare Switch in series with 86G input signal from GP2100 to Exciter, in case the Ex2100 trip is required, the testing member can stop the Ex2100 with this Switch in open position also Make a Preparation the chart recorder on the Shunt and Generator output8. Keep the Communication cable(Ethernet S/W) from MKVI to ACLE of M1 and M2 of EX2100.9. Verify that Manual mode is selected on Keypad.10. Close 41DC control power on.11. Turn on the Blower motor power.12. Start EX2100 from the Keypad(FV:10VPreset, FI=27amps-10V/0.3737125degree C), See PT failure is expected.13. Simulate the generator on-line with jumper on Terminal 45 46 on ECTB card.14. Verify the On-line condition on Keypad or Relay on ECTB card.15. Increase Generator Am