B Qin Gao Yuan Zeng Xiang Hui Sun Jing Yu Sun Jing Yu Zhou Xiang Zhou Xiang Second ISSUE FIRST ISSUE CHECKED BY REVIEWED BY APPROVED BY DESCRIPTION A 13.July.2013 28.May.2013 Luo Liang Luo Liang REV. DATE PREPARED BY OWNER VIETNAM ELECTRICITY THERMAL POWER PROJECT MANAGEMENT BOARD 3 CONSULTANT POWER ENGINEERING CONSULTING JOINT STOCKCOMPANY 2 CONTRACTOR DONGFANG ELECTRIC CORPORATION LIMITED SUBCONTRACTOR GUANGDONG ELECTRIC POWER DESIGN INSTITUTE EVN Ref. No.: DH1/ A3‐C2/ DE/E / 0249 DEC Ref. No.: DH1_DDBSE3_D_0101_202 PROJECT: DUYEN HAI 1 THERMAL POWER PLANT PROJECT CONTRACT NO.： DH1‐30032010 Document Status: FOR APPROVAL Document Title: Short‐Circuit Analysis Report Document No.: Rev.: F4281S‐D0101‐203 B Table of Contents 1. Summary 3 2. Single-line diagram information 4 2.1 Single‐line diagram 4 2.1.1 Reference documents 4 2.2 Model in Etap 5 2.3 Model input data of the project . 9 3. Short-circuit result 11 3.1 Case one 11 3.2 Case two 13 3.3 Case three 14 3.4 Motor Current feedback 14 Summary This report presents line-to-ground, line-to-line, line-to-line-grounding, and three-phase fault studies per IEC standards by ETAP version 11.1.1.0C For details see attached Table below, Standard Compliance in IEC Calculation Methods listed in the table STANDARD PUBLICATION YEAR TITLE IEC 62271‐100 2003 High‐voltage switchgear and controlgear – Part 100: High‐voltage alternating‐current circuit breakers IEC 62271‐200 2003 High‐voltage switchgear and controlgear – Part 200: AC metal‐enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV IEC 62271‐203 2003 High‐voltage switchgear and controlgear – Part 203: Gas‐insulated metal‐enclosed switchgear for rated voltages above 52 kV IEC 60282‐2 1997 High‐voltage fuses – Part2: Expulsion fuses IEC 61363‐1 1998 Electrical installations of ships and mobile and fixed offshore units – Part 1: Procedures for calculating short‐circuit currents in three‐phase a.c. IEC 60909‐0 2001 Short‐Circuit Currents in Three‐phase a.c. systems ‐ Part 0: Calculation of Currents (including 2002 corrigendum1) for systems up to 500kV IEC 60909‐1 2002 Short‐circuit currents in three‐phase a.c. systems ‐ Part 1: Factors for the calculation of short‐circuit currents according to IEC‐60909‐0 IEC 60909‐2 1992 Electrical equipment ‐ Data for short‐circuit current calculations in accordance with IEC 909 (1988) IEC 60909‐4 2000 Short‐circuit currents in three‐phase a.c. systems Part 4: Examples for the calculation of short‐circuit currents IEC 60947‐1 2004 Low voltage switchgear and controlgear, Part 1: General rules IEC 60947‐2 2003 Low voltage switchgear and controlgear, Part 2: Circuit breakers Considers three operational modes, the first is the normal operation, followed is putting into the standby transformer after quitted station service transformers, finally is putting into the emergency power when power blackout Later in this report these three operational modes are simplified as case one, case two and case three Single‐line diagram information 2.1 Single‐line diagram 2.1.1 Reference documents EVN Ref. No. DH1/DW710/001/002/00 DH1/DW710/001/003/00 DH1/DW710/001/004/00 DEC Ref. No. DH1_DDBSE3_D_0101_301 DH1_DDBSE3_D_0101_302 DH1_DDBSE3_D_0101_302 Date 30.NOV.2011 30.NOV.2011 30.NOV.2011 REV. 1 1 1 2.2 Model in Etap U1 12329 MVAsc 0LAC10 AP100 M01 DUYEN HAI 220kV SWITCHYAR 220 kV GEN.TRANS.#1 750 MVA 10BAT01 STANDBY TRANS #01 GEN.TRANS.#2 750 MVA 56/38/38 MVA A0BCT01 20BAT01 Bus53 22 kV ISOLATED PHASE BUS I Bus54 6.9 kV 6.9 kV ISOLATED PHASE BUS II 22 kV UNIT #1A TRANS 56/38/38 MVA GENERATOR #1 10BBT01 622.5 MW UNIT #1B TRANS 28 MVA 6.6KV UNIT2 BUSBAR 2B 10BBT02 6.6KV UNIT2 BUSBAR 2A 10MKA01 6.6KV UNIT1 BUSBAR 1A 6.6KV UNIT2 BUSBAR 2C UNIT #2A TRANS 6.6KV UNIT1 BUSBAR 1C 56/38/38 MVA GENERATOR #2 6.6KV UNIT1 BUSBAR 1B 20BBT01 622.5 MW UNIT #2B TRANS 28 MVA 20BBT02 20MKA01 Network of UNIT #1A TRANS Bus53 Bus54 Network of UNIT #2A TRANS Bus53 Bus54 Bus53 Bus54 Network of UNIT BUS C Figure Model of Main Network Bus53 UNIT #1A TRANS UNIT #1A TRANS 10BBA 6.6 kV 6.6KV UNIT1 BUSBAR 1B Bus54 10BBB 6.6KV UNIT1 BUSBAR 1A 6.6 kV #2 Coal Mill 2300 kW #4 Coal Mill 2300 kW X0HFB20 AF001 #1 S.A.C 250 kW #1 Coal Mill 2300 kW A 0QFA11 AN001 X0HFB10 AF001 X0HFB40 AF001 #1 Ash air compressor 350 kW #1 Draft Fan 5400 kW 6.6 kV 6.6 kV 10BBD X0HFB30 AF001 10BBE #2 Draft Fan 5400 kW Desulfurization Busbar 1B Desulfurization Busbar 1A X0HNC10 AN001 A 0ETP10 AN014 #2 S.F.P.B.P 580 kW X 0LAC20 AP100 M01 X0HLB20 AN001 #1 C.C.W.P 630 kW X0HFE10 AN001 A 0QFA12 AN001 Open #2 Secondary Air Fan 2000 kW X 0LAC10 AP100 M01 X0HLB10 AN001 #1 Primary Air Fan 1600 kW #2 Ash air compressor 350 kW X0HNC20 AN001 #1 S.F.P.B.P 580 kW #1 Secondary Air Fan 2000 kW Open #2 S.A.C 250 kW #3 Coal Mill 2300 kW Open A 0ETP10 AN011 #2 C.C.W.P 630 kW #2 Primary Air Fan 1600 kW X 0PGA00 AP001 M01 X0HFE20 AN001 #1 Seawater booster pump #1 Condensate Pump 2100 kW X 0LCB10 AP100 M01 10A0HTJ10AP001 X 0LCB20 AP100 M01 #1 Areation Fan #1 Circulating Water Pump #3 Areation Fan 1400 kW 3500 kW #2 Circulating Water Pump 3500 kW 1400 kW A0HTG11AN011 #1 Desulfurization Trans #1 Boost Up Fan 0PAC11 AP001 X 0PGA00 AP002 M01 #2 Condensate Pump 2100 kW 1300 kW A0HTG13AN011 1600 kVA 6000 kW 0PAC12 AP001 #2 Areation Fan 1400 kW 10HTJ10AN001 A0HTG12AN011 #1A Boiler Trans #1A Turbine Trans #1B Boiler Trans FGD Systerm PC #1 Unit GGH-HP Water Pump 90 kW 0.42 kV 10BFA #1 Turbine PC B 10BFT60 10BFT20 Lump47 1100 kVA Open #1 Turbine PC A 2500 kVA 1600 kVA 10BFT10 0.42 kV #1B Turbine Trans 10BFT40 10BFT50 10BFT30 #1B Precipitator Trans 2000 kVA 2500 kVA 2000 kVA 1600 kVA 0.42 kV #1A Precipitator Trans 0.42 kV 10BFB #1 Boiler PC A 0.42 kV 10BFC #1 Boiler PC B Precipitator PC 1A 0.42 kV 10BFD Precipitator PC 1B 0.42 kV Open Lump9 260 kVA Lump8 141 kVA C.M.W.Pump 90 kW Open #1 S.V Pump Open #2 S.V Pump 160 kW #1 Slurry Pump 110 kW 0.42 kV 160 kW #1 Turbine MCC1 0.42 kV coal bunker bay MCC 0.42 kV A0BLA 10BJA 0.42 kV #1 Turbine MCC3 Open #1 Sealing Fan 185 kW #1 Boiler MCC1 Turbine T.D.P 0.42 kV 90 kW 10BJF 10BJC #1 Motor Of oil pump 10BFE 10BFF Open Open Open #1 Boiler T.D.P #1 Boiler Open MCC3 #2 Motor Of oil pump 90 kW 0.42 kV Lump58 1100 kVA Lump59 1100 kVA 10BJH 0.42 kV Lump19 Load18 178 kVA 91.5 kVA Lump17 54.8 kVA #1 Turbine MCC2 0.42 kV Lump18 75.8 kVA Load19 40 kVA 10BJB Lump12 88.5 kVA APS Power 0.42 kV Lump20 53.8 kVA Lump16 188 kVA #1 Boiler MCC2 Lump10 Lump11 48 kVA 391 kVA 0.42 kV Lump13 235 kVA Load17 40 kVA #2 Slurry Pump 110 kW Load15 120 kVA #2 Sealing Fan 185 kW Lump14 48.5 kVA Open Open 10BMA 0.42 kV #1 Emergency PC A 0.42 kV 10BMC #1 Emergency PC C Open 10BJG 0.42 kV 10BMB #1 Emergency PC B Open Lump52 729 kVA #1 DIESEL ENGINE GENE 1800 kW Lump53 736 kVA Figure Model of UNIT #1A TRANS UNIT #2A TRANS UNIT #2A TRANS Bus54 6.6 kV 6.6KV UNIT2 BUSBAR 2A 6.6 kV 20BBA 6.6KV UNIT2 BUSBAR 2B Bus53 20BBB Open 6.6 kV 6.6 kV 20BBE Desulfurization Busbar 2B 20BBD Desulfurization Busbar 2A #6 Coal Mill 2300 kW #8 Coal Mill 2300 kW 20HFB20 AF001 #3 S.A.C 250 kW #5 Coal Mill 2300 kW 20HFB10 AF001 A 0QFA13 AN001 #3 Draft Fan 5400 kW X0HFB40 AF001 #3 Ash air compressor 350 kW #4 Draft Fan 5400 kW #2 Seawater Booster pump #3 S.F.P.B.P 580 kW #3 Secondary Air Fan 2000 kW X0HNC20 AN001 1600 kW X0HLB20 AN001 #3 C.C.W.P 630 kW #3 Primary Air Fan 1600 kW 0LCB10 AP100 M01 #4 S.F.P.B.P 580 kW #4 Secondary Air Fan 2000 kW 20A0HTJ10AP001 0LAC10 AP100 M01 20HLB10 AN001 #4 Areation Fan 0PGA00 AP001 M01 1600 kVA A0HTG14AN011 0LCB10 AP100 M01 #4 C.C.W.P 630 kW X0HFE20 AN001 A0HTG16AN011 X 0PGA00 AP002 M01 #4 Condensate Pump 2100 kW #2 Boost Up Fan #3 Circulating Water Pump 3500 kW X 0LAC20 AP100 M01 #4 Primary Air Fan 1600 kW #6 Areation Fan 1400 kW #2 Desulfurization Trans 1400 kW #3 Condensate Pump 2100 kW #4 Ash air compressor 350 kW A 0QFA14 AN001 A 0ETP10 AN018 X0HFB30 AF001 20HNC10 AN001 Open #4 S.A.C 250 kW #7 Coal Mill 2300 kW A 0ETP10 AN017 X 0LCB20 AP100 M01 6000 kW 0.42 kV FGD Systerm PC #4 Circulating Water Pump 3500 kW #5 Areation Fan 20HTJ10AN001 1400 kW 0PAC11 AP001 0PAC12 AP001 A0HTG15AN011 Lump48 1100 kVA #2 Unit GGH HP Water Pump #2A Boiler Trans 2000 kVA 1600 kVA #2B Precipitator Trans 2000 kVA 90 kW 2500 kVA 20BFT30 20BFT10 #2B Boiler Trans #2A Precipitator Trans #2A Turbine Trans 2500 kVA 20BFT40 #2B Turbine Trans 20BFT50 20BFT60 1600 kVA 20BFT20 0.42 kV #2 Turbine PC A 0.42 kV 20BFA #2 Turbine PC B 0.42 kV 20BFB #2 Boiler PC A 20BFC 0.42 kV #2 Boiler PC B 20BFD Precipitator PC 2B Precipitator PC 2A 0.42 kV 0.42 kV 20BFE 20BFF Lump26 260 kVA Lump27 141 kVA Open #3 S.V Pump Open #2 C.M.W.Pump 90 kW #2 Turbine MCC3 160 kW 0.42 kV 20BJC #2 Turbine MCC1 0.42 kV #2 Turbine T.D.P Lump22 54.8 kVA #2 Turbine MCC2 Load23 40 kVA Lump28 48 kVA 0.42 kV 0.42 kV 10BJB coal bunker bay MCC3 0.42 kV 0.42 kV #4 Motor Of oil pump 90 kW Lump29 391 kVA 0.42 kV 20BJG Lump60 1100 kVA Lump63 1100 kVA #4 Slurry Pump 110 kW #4 Sealing Fan 185 kW Lump25 53.8 kVA Lump30 48.6 kVA Load27 50 kVA Open 0.42 kV #2 EMERGENCY PC C 0.42 kV Open Open Open #2 Boiler T.D.P Load26 #2 Boiler MCC2 120 kVA Load24 40 kVA APS Power1 Open Lump21 188 kVA H.P.F.W.P Open 55 kW #3 Motor Of oil pump Open 90 kW 0.42 kV #2 Boiler MCC3 #2 Boiler MCC1 #3 Slurry Pump 20BJH 110 kW 20BJF 0.42 kV 185 kW #4 S.V Pump 160 kW 0.42 kV 20BJA Lump23 Lump24 75.8 kVA Load22 91.5 kVA 188 kVA #3 Sealing Fan 0.42 kV Open #2 EMERGENCY PC B Open #2 EMERGENCY PC A Load21 736 kVA Load20 729 kVA #2 DIESEL ENGINE GENE 1000 kW Figure Model of UNIT #2A TRANS Bus53 UNIT #1B TRANS UNIT #2B TRANS 6.6KV UNIT1 BUSBAR 1C 6.6 kV 10BBC 6.6 kV Open 20BBC Fire Pump 315 kW #10 Coal Mill A 0SGA12 AP001 2300 kW #1 S.H.G 1000 kW A0QCL99 AP101 6.6KV UNIT2 BUSBAR 2C Bus54 Off-site Ash Yard Trans AP001X0HFB60 AF001 #1 Feed pump 630 kVA 6700 kW #9 Coal Mill 2300 kW #1 Office Trans Off-site Ash Yard Bus 0.42 kV AP001X0HFB50 AF001 #2 S.H.G 1000 kW 800 kVA A0BHT60 A0QCL99 AP102 X 0LAC30 AP100 M01 #5 Ash air compressor 350 kW A0BCB A 0ETP10 AN015 6.6 kV Office PC 0.42 kV Lump50 600 kVA 6.6 kV #12 Coal Mill1 2300 kW 6.6kV Coal Busbar B A0BCA 6.6kV Coal Busbar A T1 A0BHT70 630 kVA 20HFB60 AF001 #11 Coal Mill 2300 kW 20HFB50 AF001 A0BHK #2 Feed Pump 6700 kW Off-site Ash yard PC 0.42 kV 0LAC30 AP100 M01 Lump51 400 kVA #1 Ash Trans #2 Coal Trans 800 kVA #1 Coal Trans A0BHT21 1250 kVA Water-cooled Screw chille 161 kW #2 Ash Trans 1250 kVA 800 kVA A0BHT12 A0BHT22 A0BHT11 #2 Coal Crusher 400 kW 0EAC11 AF005 0.42 kV #1 Wasted Water Trans A0BHT41 800 kVA #3 Aerating Fan 55 kW #2 Aerating Fan Lump66 55 kW 540 kVA #1 Aerating Fan 55 kW 0EAC12 AF006 0.42 kV Coal PC B A0BHA 0EBE11 AJ001 1600 kVA C6AB Tape converyer 250 kW Coal PC A 500 kVA #1Chemical Water Trans #6 Ash air compressor 350 kW A 0ETP10 AN101 C5AB Tape converyer 220 kW #1 Coal Crusher 400 kW #1 Lighting Trans 10BFT51 0EBE12 AJ001 A0BHB #2Chemical Water Trans A0BHB #2 Wasted Water Trans 1600 kVA 800 kVA A0BHT42 #1 Common Trans 1000 kVA #1 Maintenance Trans 800 kVA A0BHT51 10BFT52 A0BHT32 A0BHT31 Open Open #2 Coal reclaimer 430 kW #1 Coal reclaimer 430 kW Coal MCC 0.42 kV 0EAF10 AE201 #2 Spray Pump C2 Belt Conveyor 185 kW Waste Water PC A Lump39 188 kVA 0.42 kV Waste Water PC B A0BHE 0.42 kV Water Treatment PC B Open #1Site Transfer Oil Pump 75 kW A0BHH Open Open 0.42 kV 132 kW #2 Service Water Pump Open 132 kW Lump41 82.7 kVA 0.42 kV A0BLR #1 Dimineralized Pump 0.42 kV 10BFG #1 Lighting PC A 0.42 kV 20BFG #2 Lighting PC B #1 Maintenance PC A 0.42 kV #2 Maintenance PC B 10BFH 20BFH #1 Flush Water Pump 110 kW #2 Site Transfer Oil Pump 75 kW Load6 199 kVA Open Lump32 68 kVA Ash MCC 0.42 kV Open Load7 197 kVA Load8 420 kVA Open Load9 420 kVA #2 Flush Water Pump 110 kW Lump49 300 kVA Diesel Tank MCC 0.42 kV 75 kW #2 Secondary RO Pump 75 kW #1 Primary RO Pump 132 kW Open Open #2 Dimineralized Pump C.W.T MCC 75 kW #1 Secondary RO Pump 75 kW Lump38 661 kVA Common System MCC 0.42 kV 0.42 kV Ash PC B A0BHD A0BHC Lump31 68 kVA Waste Water Treatment MCC Open #1 Screen Wash Pump 132 kW 20BFT52 0.42 kV Ash PC A A0BLO Lump35 170 kVA Open Open #1 Service Water Pump Lump37 661 kVA 800 kVA 20BFT51 0.42 kV A0BHF Lump36 170 kVA Open #2 Maintenance Trans 500 kVA 0EAC11 AF003 C4 Belt Conveyor 185 kW Open 0.42 kV A0BHJ Common System PC B Open #2 Lighting Trans Open A0BHG Water Treatment PC A 0.42 kV A0BHI Common System PC A 1000 kVA A0BHT52 0EAF20 AE201 75 kW 0EAC12 AF003 0.42 kV #2 Common Trans C3A Tape converyer 440 kW C3B Tape converyer #1 Spray Pump 440 kW 75 kW 0.42 kV A0BHL Open Lump40 355 kVA A0BKA #2 Primary RO Pump 132 kW Lump42 65.9 kVA Lump46 133 kVA 0.42 kV 0.42 kV Fresh Water Treatment MCC A0BLQ Plant Oil Pump House MCC A0BLS Lump43 40 kVA Lump45 179 kVA 0.42 kV A0BKB Coal-bearing Waste Water Lump44 126 kVA Figure Model of UNIT BUS C 2.3 Model input data of the project For this study, we will use the data presented below: Power Grid Input Data Power Grid Connected Bus U1 DUYEN HAI 220kV SWITCHYAR Rating MVASC kV R 12329 220 0.13339 % Impedance 100 MVA Base X’’ R/X’’ 0.80200 0.17 Grounding Type Wye‐ Solid Total Connected Power Grids ( = 1 ): 12329MVA Synchronous Generator Input Data Power Grid GENER‐ATOR #1 GENER‐ATOR #2 Connected Bus 10MKA01 Turbo 20MKA01 Turbo KKS MVASC 732.353 732.353 Rating kV 22.0 22.0 %PF 85.0 85.0 Total Connected Synchronous Generators ( = 2.00 ) : 1,464.706 MVA % Impedance in Machine Base R Xd’’ R/X’’ Xd 0.987 18.75 0.05 155.0 0.987 18.75 0.05 155.0 Grounding Conn Type Amp Wye 27.99 Wye 27.99 Excitation Type Turbine 130% Turbine 130% 3‐Winding Transformer Input Data Rating Winding MVA Primary 56 UNIT #1A TRANS. 10BBT01 Secondary 38 Tertiary 38 Primary 56 UNIT #2A TRANS. 20BBT01 Secondary 38 Tertiary 38 Primary 56 STANDBY TRANS. 38 A0BCT01 Secondary #01 Tertiary 38 Transformer KKS kV 22 6.9 6.9 22 6.9 6.9 220 6.9 6.9 Impedance %Z X/R’ MVA 20 30 56 20 30 56 37.34 30 56 20 30 56 20 30 56 37.30 30 56 20 30 56 20 30 56 37.00 30 56 Phase Shift Type Angle Std Pos. Seq ‐30 Std Pos. Seq ‐30 Std Pos. Seq ‐30 Std Pos. Seq ‐30 Std Pos. Seq 0 Std Pos. Seq 0 Conn Type Delta Wye Wye Delta Wye Wye Wye Wye Wye Type Resistor Resistor Resistor Resistor Resistor Resistor Grounding kV Amp 1138.2 1138.2 1138.2 1138.2 1138.2 1138.2 Ohm 3.500 3.500 3.500 3.500 3.500 3.500 2‐Winding Transformer Input Data Transformer GEN TRANS. #1 GEN TRANS. #2 UNIT #1B TRANS. UNIT #2B TRANS. KKS 10BAT01 20BAT01 10BBT02 20BBT02 MVA 750 750 28 28 Rating Prim. kV Sec. kV 22 225 22 225 22 6.9 22 6.9 %Z 18 18 12 12 X/R 45 45 45 45 Phase Shift Type Angle Ynd ‐30 Ynd ‐30 Dyn 30 Dyn 30 Conn. Type D/Y D/Y D/Y D/Y Grounding Primary Type Secondary Type Solid Solid Resistor Resistor Short‐circuit result Phase faults are considered on base IEC 60909 Standard giving values in initial symmetrical r.m.s, peak values and asymmetrical breaking r.m.s short circuit currents The software ETAP is used for the calculation of maximum short-circuit current For maximum short-circuit currents, three phase faults are considered, excepted if the single phase fault is higher than the phase faults values The following symbol is used in this document and also as per IEC 60909 Standard: Ik’’: Initial Symmetrical Short-circuit Current (kA) Ip : Peak Current (kA), Method C Ib : Breaking Current (kA, rms, symm) Ik : Steady State Current (kA, rms) 3.1 Case one Operational mode：Normal The table below present the short-circuit currents for all the major buses of this plant Short‐Circuit Summary Report Fault at bus ID DUYEN HAI 220kV SWITCHYAR ISOLATED PHASE BUS I 6.6KV UNIT1 BUSBAR 1A 6.6KV UNIT1 BUSBAR 1B 6.6KV UNIT1 BUSBAR 1C #1 Lighting PC A #1 Maintenance PC A #2 Boiler MCC1 #2 Boiler MCC3 #2 Boiler PC A #2 Boiler T.D.P. #2 EMERGENCY PC A #2 EMERGENCY PC B #2 Turbine MCC1 #2 Turbine MCC3 #2 Turbine PC B #2 Turbine T.D.P APS Power1 Ash MCC Ash PC A Coal‐bearing Waste Water coal bunker bay MCC3 Common System MCC Common System PC A Desulfurization MCC Diesel Tank MCC Chemical Water Treatment MCC Office PC Off‐site Ash Yard Bus Plant Oil Pump House MCC Precipitator PC 2A Waste Water PC B Waste Water Treatment MCC Water Treatment PC A kV KKS 220 22 6.6 10BBA 6.6 10BBB 6.6 10BBC 0.42 10BFG 0.42 10BFH 0.42 20BJF 0.42 20BJH 0.42 20BFC 0.42 0.42 20BMA 0.42 20BMB 0.42 20BJA 0.42 20BJC 0.42 20BFB 0.42 0.42 0.42 0.42 A0BHC 0.42 A0BKB 0.42 0.42 0.42 A0BHI 0.42 A0BKC 0.42 A0BKA 0.42 A0BLR 0.42 A0BHK 0.42 A0BHL 0.42 A0BLQ 0.42 20BFE 0.42 0.42 A0BLO 0.42 A0BHE ’’ Ik 44.120 219.034 44.432 45.927 35.090 18.301 19.767 33.149 33.149 33.149 30.517 35.337 33.149 32.444 35.337 35.337 35.337 33.149 22.690 22.690 23.631 32.444 30.327 30.327 37.323 23.631 39.436 23.898 24.702 23.631 40.731 23.631 23.631 39.436 3‐Phase Fault ip Ib 105.238 / 574.381 / 113.774 / 117.208 / 89.283 / 29.901 / 40.219 / 74.629 / 74.629 / 74.629 / 69.633 / 78.602 / 74.629 / 73.164 / 78.602 / 78.602 / 78.602 / 74.629 / 46.045 / 46.045 / 47.368 / 73.164 / 61.283 / 61.283 / 82.307 / 47.368 / 78.690 / 47.860 / 49.501 / 47.368 / 92.633 / 47.368 / 47.368 / 78.690 / Ik 43.640 210.036 25.221 26.598 24.739 18.203 19.634 29.872 29.872 29.872 29.872 29.547 29.872 29.547 29.547 29.547 29.547 29.872 18.744 18.744 19.634 29.547 23.122 23.122 28.020 19.634 30.398 19.634 20.430 19.634 37.104 19.634 19.634 30.398 ’’ Ik 49.621 0.031 1.195 1.195 1.194 18.350 19.831 32.274 32.274 32.274 30.561 33.489 32.274 31.700 33.489 33.489 33.489 32.274 21.633 21.633 22.267 31.700 28.217 28.217 34.067 22.267 36.243 22.425 23.242 22.267 39.708 22.267 22.267 36.243 Line‐to‐Ground Fault ip Ib 118.360 49.621 0.081 0.031 3.059 1.195 3.049 1.195 3.037 1.194 29.981 18.350 40.349 19.831 72.657 32.274 72.657 32.274 72.657 32.274 69.763 30.561 74.493 33.489 72.657 32.274 71.487 31.700 74.493 33.489 74.493 33.489 74.493 33.489 72.657 32.274 43.9 21.633 43.9 21.633 44.634 22.267 71.487 31.700 57.019 28.217 57.019 28.217 76.317 34.607 44.634 22.267 72.319 36.243 44.909 22.425 46.575 23.242 44.634 22.267 90.306 39.708 44.634 22.267 44.634 22.267 72.319 36.243 Ik 49.621 0.031 1.195 1.195 1.194 18.350 19.831 32.274 32.274 32.274 30.561 33.489 32.274 31.700 33.489 33.489 33.489 32.274 21.633 21.633 22.267 31.700 28.217 28.217 34.607 22.267 36.243 22.425 23.242 22.267 39.708 22.267 22.267 36.243 ’’ Ik 38.310 191.439 39.20 39.626 30.267 15.849 17.118 28.707 28.707 28.707 26.427 30.601 28.707 28.096 30.601 30.601 30.601 28.707 19.533 19.533 20.465 28.096 26.147 26.147 32.244 20.465 34.151 20.696 21.392 20.465 35.024 20.465 20.465 34.151 Line‐to‐Line Fault ip Ib Ik 91.380 38.310 38.310 502.018 191.439 191.439 100.378 39.20 39.20 101.626 39.626 39.626 77.011 30.267 30.267 25.894 15.849 15.849 34.830 17.118 17.118 64.627 28.707 28.707 64.627 28.707 28.707 64.627 28.707 28.707 60.327 26.427 26.427 68.068 30.601 30.601 64.627 28.707 28.707 63.359 28.096 28.096 68.068 30.601 30.601 68.068 30.601 30.601 68.068 30.601 30.601 64.627 28.707 28.707 39.680 19.533 19.533 39.680 19.533 19.533 41.021 20.465 20.465 63.359 28.096 28.096 52.837 26.147 26.147 52.837 26.147 26.147 71.106 32.244 32.244 41.021 20.465 20.465 68.145 34.151 34.151 41.447 20.696 20.696 42.868 21.392 21.392 41.021 20.465 20.465 79.654 35.024 35.024 41.021 20.465 20.465 41.021 20.465 20.465 68.145 34.151 34.151 ’’ Ik 48.077 191.447 39.492 39.925 30.565 18.350 19.811 32.917 32.917 32.917 30.549 34.839 32.917 32.248 34.839 34.839 34.839 32.917 22.202 22.202 23.131 32.248 29.441 29.441 36.568 23.131 38.303 23.361 24.167 23.131 40.227 23.131 23.131 38.303 Line‐to‐Line‐to‐Ground ip Ib Ik 114.678 48.077 48.077 502.038 191.447 191.447 101.126 39.492 39.492 101.891 39.925 39.925 77.770 30.565 30.565 29.980 18.350 18.350 40.309 19.811 19.811 74.105 32.917 32.917 74.105 32.917 32.917 74.105 32.917 32.917 69.736 30.549 30.549 77.495 34.839 34.839 74.105 32.917 32.917 72.723 32.248 32.248 77.495 34.839 34.839 77.495 34.839 34.839 77.495 34.839 34.839 74.105 32.917 32.917 45.055 22.202 22.202 45.055 22.202 22.202 46.364 23.131 23.131 72.723 32.248 32.248 59.491 29.441 29.441 59.491 29.441 29.441 80.642 36.568 36.568 46.364 23.131 23.131 76.428 38.303 38.303 46.784 23.361 23.361 48.429 24.167 24.167 46.364 23.131 23.131 91.488 40.227 40.227 46.364 23.131 23.131 46.364 23.131 23.131 76.428 38.303 38.303 3.2 Case two Operational mode：Put into the standby transformer after quitted station service transformers The table below present the short-circuit currents for all the major buses of this plant Short‐Circuit Summary Report Fault at bus ID DUYEN HAI 220kV SWITCHYAR ISOLATED PHASE BUS I 6.6KV UNIT1 BUSBAR 1A 6.6KV UNIT1 BUSBAR 1B 6.6KV UNIT1 BUSBAR 1C #1 Lighting PC A #1 Maintenance PC A #2 Boiler MCC1 #2 Boiler MCC3 #2 Boiler PC A #2 Boiler T.D.P. #2 EMERGENCY PC A #2 EMERGENCY PC B #2 Turbine MCC1 #2 Turbine MCC3 #2 Turbine PC B #2 Turbine T.D.P APS Power1 Ash MCC Ash PC A Coal‐bearing Waste Water coal bunker bay MCC3 Common System MCC Common System PC A Desulfurization MCC Diesel Tank MCC Chemical Water Treatment MCC Office PC Off‐site Ash Yard Bus kV KKS 220 22 6.6 10BBA 6.6 10BBB 6.6 10BBC 0.42 10BFG 0.42 10BFH 0.42 20BJF 0.42 20BJH 0.42 20BFC 0.42 0.42 20BMA 0.42 20BMB 0.42 20BJA 0.42 20BJC 0.42 20BFB 0.42 0.42 0.42 0.42 A0BHC 0.42 A0BKB 0.42 0.42 0.42 A0BHI 0.42 A0BKC 0.42 A0BKA 0.42 A0BLR 0.42 A0BHK 0.42 A0BHL ’’ Ik 44.679 217.045 46.927 43.983 30.328 18.245 19.696 32.978 32.978 32.978 30.351 35.173 32.978 32.276 35.173 35.173 35.173 32.978 22.690 22.690 23.558 32.276 25.166 25.166 37.323 23.558 39.264 23.827 24.623 3‐Phase Fault ip Ib 106.275 / 568.418 / 120.577 / 112.902 / 79.228 / 29.833 / 40.095 / 74.251 / 74.251 / 74.251 / 69.295 / 78.241 / 74.251 / 72.796 / 78.241 / 78.241 / 78.241 / 74.251 / 46.045 / 46.045 / 47.241 / 72.796 / 50.209 / 50.209 / 82.307 / 47.241 / 78.388 / 47.736 / 49.363 / Ik 38.673 214.433 25.122 25.122 20.415 17.911 19.252 28.978 28.978 28.978 28.978 28.672 28.978 28.672 28.672 28.672 28.672 28.978 18.744 18.744 19.252 28.672 19.252 19.252 28.020 19.252 29.490 19.252 20.016 ’’ Ik 43.478 0.031 1.195 1.195 1.194 18.312 19.783 32.164 32.164 32.164 30.448 33.390 32.164 31.592 33.390 33.390 33.390 32.164 21.633 21.633 22.223 31.592 23.154 23.154 34.067 22.223 36.145 22.382 23.195 Line‐to‐Ground Fault ip Ib 103.708 43.478 0.081 0.031 3.070 1.195 3.067 1.195 3.119 1.194 29.942 18.312 40.271 19.783 72.418 32.164 72.418 32.164 72.418 32.164 69.518 30.448 74.275 33.390 72.418 32.164 71.252 31.592 74.275 33.390 74.275 33.390 74.275 33.390 72.418 32.164 43.9 21.633 43.9 21.633 44.564 22.223 71.252 31.592 46.195 23.154 46.195 23.154 76.317 34.607 44.564 22.223 72.162 36.145 44.841 22.382 46.500 23.195 Ik 43.478 0.031 1.195 1.195 1.194 18.312 19.783 32.164 32.164 32.164 30.448 33.390 32.164 31.592 33.390 33.390 33.390 32.164 21.633 21.633 22.223 31.592 23.154 23.154 34.607 22.223 36.145 22.382 23.195 ’’ Ik 38.805 189.745 40.479 37.933 26.219 15.800 17.056 28.557 28.557 28.557 26.281 30.457 28.557 27.949 30.457 30.457 30.457 28.557 19.533 19.533 20.401 27.949 21.793 21.793 32.244 20.401 34.000 20.663 21.322 Line‐to‐Line Fault ip Ib 92.561 38.805 496.923 189.745 104.009 40.479 97.371 37.933 68.496 26.219 25.834 15.800 34.721 17.056 64.297 28.557 64.297 28.557 64.297 28.557 60.004 26.281 67.752 30.457 64.297 28.557 63.036 27.949 67.752 30.457 67.752 30.457 67.752 30.457 64.297 28.557 39.680 19.533 39.680 19.533 40.909 20.401 63.036 27.949 43.479 21.793 43.479 21.793 71.106 32.244 40.909 20.401 67.880 34.000 41.338 20.633 42.747 21.322 Ik 38.805 189.745 40.479 37.933 26.219 15.800 17.056 28.557 28.557 28.557 26.281 30.457 28.557 27.949 30.457 30.457 30.457 28.557 19.533 19.533 20.401 27.949 21.793 21.793 32.244 20.401 34.000 20.633 21.322 ’’ Ik 45.386 189.745 40.778 38.232 26.518 18.311 19.754 32.772 32.772 32.772 30.408 34.701 32.772 32.106 34.701 34.701 34.701 32.772 22.202 22.202 23.067 32.106 24.453 24.453 36.568 23.067 38.152 23.299 24.098 Line‐to‐Line‐to‐Ground ip Ib Ik 108.275 45.386 45.386 496.923 189.745 189.745 104.77 40.788 40.788 98.138 38.232 38.232 69.275 26.518 26.518 29.940 18.311 18.311 40.214 19.754 19.754 73.788 32.772 32.772 73.788 32.772 32.772 73.788 32.772 32.772 69.427 30.408 30.408 77.192 34.701 34.701 73.788 32.772 32.772 72.413 32.106 32.106 77.192 34.701 34.701 77.192 34.701 34.701 77.192 34.701 34.701 73.788 32.772 32.772 45.055 22.202 22.202 45.055 22.202 22.202 46.255 23.067 23.067 72.413 32.106 32.106 48.785 24.453 24.453 48.785 24.453 24.453 80.642 36.568 36.568 46.255 23.067 23.067 76.169 38.152 38.152 46.677 23.299 23.299 48.310 24.098 24.098 Plant Oil Pump House MCC Precipitator PC 2A Waste Water PC B Waste Water Treatment MCC Water Treatment PC A 3.3 0.42 0.42 0.42 0.42 0.42 A0BLQ 20BFE A0BLO A0BHE 23.558 40.465 23.558 23.558 39.264 47.241 92.049 47.241 47.241 78.388 / / / / / 19.252 35.735 19.252 19.252 29.490 22.223 39.535 22.223 22.223 36.145 44.564 89.932 44.564 44.564 72.162 22.223 39.535 22.223 22.223 36.145 22.223 39.535 22.223 22.223 36.145 20.401 34.791 20.401 20.401 34.000 40.909 79.142 40.909 40.909 67.880 20.401 34.791 20.401 20.401 34.000 20.401 34.791 20.401 20.401 34.000 23.067 40.004 23.067 23.067 38.152 46.255 90.999 46.255 46.255 76.169 23.067 40.004 23.067 23.067 38.152 23.067 40.004 23.067 23.067 38.152 Case three Operational mode：Put into putting into the emergency power when power blackout The table below present the short-circuit currents for all the emergency PC Short‐Circuit Summary Report Fault at bus ID kV #1 EMERGENCY PC C 0.42 KKS 10BMC 3‐Phase Fault ip Ib Ik 39.726 83.342 / ’’ Ik 0.000 ’’ Ik 43.497 Line‐to‐Ground Fault ip Ib 91.253 43.497 ’’ Ik 43.497 Ik 34.890 Line‐to‐Line Fault ip Ib 73.197 34.890 Ik 34.890 ’’ Ik 43.136 Line‐to‐Line‐to‐Ground ip Ib 90.496 43.136 Ik 43.136 According to the calculated results above, the maximum short-circuit currents in all cases are well within the limit of breaking current and circuit rating of 220kV, 22kV, 6.6kV and 0.42kV distribution system respectively 3.4 Motor Current feedback In order to analyses the short circuit current, we calculate the current feedback of motors which are bigger than 50kW, and we show the results as below: Operational mode：Normal Motor Feedback Report Fault at bus ID kV 6.6KV UNIT1 BUSBAR 1A 6.6 KKS 10BBA Current(kA) 6.6KV UNIT1 BUSBAR 1B 6.6 10BBB Motor #1 Circulating Water Pump 2.3 Motor #1 Primary Air Fan 1.06 Motor #1 Secondary Air Fan 1.32 #2 Circulating Water Pump #2 Condensate Pump #2 Primary Air Fan Motor #1 Draft Fan 3.54 #2 Secondary Air Fan Motor &Feedback Current Motor Motor Motor #1 Coal #2 Coal Closed Cooling Mill Mill Water Pump 1.52 1.52 0.442 #2 Draft Fan #3 Coal Mill #4 Coal Mill Motor Steam feed pump booster Pump 0.388 #2 Steam feed pump booster Pump Motor Spiral air compressor 0.169 Motor Ash air compreesor 0.236 #2 Spiral air compressor #2 Ash air compressor Current(kA) 6.6KV UNIT1 BUSBAR 1C 6.6 10BBC Current(kA) 6.6kV Coal Bus bar A 6.6 A0BCA Current(kA) Desulfurization Bus bar 1A 6.6 10BBD Current(kA) Office PC 0.42 A0BHK Current(kA) #2 Boiler PC A 0.42 20BFC Current(kA) Common System PC A 0.42 A0BHI Current(kA) FGD SYSTEM PC 2 0.42 A0BHN Current(kA) #2 Turbine PC B 0.42 Current(kA) COAL HANDLING PC A 0.42 Current(kA) Ash PC A 0.42 20BFB A0BHA A0BHC Current(kA) Off‐site Ash Yard Bus 0.42 A0BHL Current(kA) Waste Water PC A 0.42 A0BHE Current(kA) Water Treatment PC A 0.42 Current(kA) A0BHG 2.3 #1Solidum hypochlorite 0.619 1.39 #5 Ash air compressor 0.233 1.06 1.32 3.83 Fire Pump 0.21 1.52 1.52 0.388 0.169 0.236 #9 Coal Mill #10 Coal Mill 1.51 C5AB Tape conveyer 0.147 0.929 1.51 C3B Tape conveyer 0.293 #1 Seawater booster pump 0.863 #1 Coal reclaimer #1 Coal Crusher 0.286 0.266 #1 Boost Up Fan #1 Aeration Fan 3.93 Water‐cooled Screw chiller 1.64 #3 Sealing Fan #3 Slurry Pump #3 Motor Of oil pump 1.88 #1 Screen Wash Pump 1.35 #2 Unit GGH HP Water Pump 0.921 #2 Condense make up water pump 0.921 #1 Spray Pump 0.769 #1 Flush Water Pump 1.12 1.12 0.921 #2 High Pressure Flush Water Pump 0.564 #4 Steam‐side vacuum pump 1.63 C2 Belt Conveyor 1.88 #1 Primary RO Pump 1.35 #1 Aeration Fan #1 Aeration Fan 0.564 #1Site Transfer Oil Pump 0.769 #1 Service Water Pump 1.35 0.564 #1 Aeration Fan 0.564 #1 Dimineralized #1 Secondary Pump RO Pump 0.769 0.769