fault calculation

FROM GENERATOR INFEED

genarator ratingsmva Xd" kv

168.75 13.50% 13.80.135

Z generator 0.152352transformer(GT)

mva X kv at fault side180 12.50% 220

0.125 value at 180 mva base=

GT reactance= 33.61111111111SHORT CKT CURRENT 1.756101672823

fault current Isc AT 220 KV BUS= 1.756101672823

669.1449814126

if 3 generators in II fault mva at 220 kv bus 2007.434944238fault current Isc at 220 kv bus 5.26830501847

120 MVA trafo(33 kv bus)Z 120 mva AT 34.5 KV BASE 1.23984375Z equivalent at 33kv bus 2.86729375

6.64498284590127379.800639540333

6.6 kv bus31.5 MVA trafoZ 31.5 MVA 0.165942857142857Zequivalent up to 6.6 kv bus 0.280634607142857

13.5785945838183155.219630406544

0.415 kv bus2 MVA trafoZ 2 MVA 0.00516675Z equivalent up to .415 kv bus 0.00627630682312164

38.220628758916

fault mva at 220kv side bus

fault current Isc at 33 kv busfault MVA at 33 kv bus

fault current Isc at 6.6 kv busfault MVA at 6.6 kv bus

fault current Isc at .415 kv bus KA

27.4722235393337fault MVA at .415 kv bus


CONSTANT1.732

at 220 kv base= 38.72 1000

value at 180 mva base= 0.125

tota Z up to 220 kv bus= 72.33111111

by impedance method

0.062727270.00393471

z genrator 220 kv base 38.72

268.888889Z GT at 220 kv base 33.6111111

z 220 bus( Z gen+ Z gt) 72.3311111I sc 1.75610167

fault MVA 669.144344

if 3 generators in IIz 220 bus 24.1103704FAULT Isc 5.26830502

fault Mva 2007.43494

FROM GRID INFEED

N1/N2=Kmeramundali network 400ict 400 220 1.818181818120 mva power trafo 220 33 6.666666667

IMPEDANCE OF MERAMUNDALI line 12.16IMPEDANCE OF MERAMUNDALI line 6.08IMPEDANCE OF MERAMUNDALI line AT 220 KV BASE Z1 1.8392

IMPEDANCE OF MERAMUNDALI NETWORK Z2 11.428571429

isc at 400 kv bus 13.190504043

fault MVA at 400 kv bus 9138.381201

impedanse of 230 MVA 0.646875

Z total 0.7660427143

isc at 33 KV bus at 230 MVA trafo 24.872134971

fault mva at 33 KV bus at 230 MVA trafo 1421.5917464

Z equivalent at 220 kv base =z1+z2 5.2963428571SC CKT IMPEDANCE OF ICT 22.279365079if 2 ICT 's are parallel= 11.13968254z equivalent at 220 kv base= 16.436025397sc ckt CURRENT AT 220 KV BUS 7.7281935354sc ckt CURRENT AT 220 KV BUS 2944.7508647z equivalent at 33kv base= 0.3698105714

SC CKT IMPEDANCE OF 120MVA =Z3 1.23984375

TOTAL SC CKT IMPEDANCE Z at 33 kv base 1.6096543214

SC CKT CURRENT Isc 11.836776089

sc ckt MVA 676.54277412

SC CKT IMPEDANCE OF 31.5 MVA 33 6.6 5

primery voltage=N1

secondry volt=N2

at 220 kv base=Z2=

SC CKT IMPEDANCE OF 31.5MVA =Z4 0.1728571429TOTAL SC CKT IMPEDANCE Z at 6.6 kv base 0.2372433157Z EQIUVALENT AT 6.6 0.2372433157sc ckt CURRENT AT 6.6 KV BUS 16.062090285sc ckt MVA AT 6.6 KV BUS 183.60896647

impedance of 2 mva trafo at 415 V base 0.00516675

TOTAL SC CKT IMPEDANCE Z at .415 kv base 0.0061047489

sc ckt CURRENT AT .415 KV BUS 39.249344413sc ckt MVA AT .415 KV BUS 28.211643778

FROM GRID INFEED

K2 actual mva %z 100 1.73214000

3.30578512396694 315 14.544.4444444444445 120 12.5

3.457143 17.50857

0

25 31.5 12.5 0.125

at 220 kv base=Z2=

FROM GRID INFEED

N1/N2=Kmeramundali network 400ict 400 220 1.8181818182120 mva power trafo 220 33 6.6666666667

IMPEDANCE OF MERAMUNDALI line 12.16IMPEDANCE OF MERAMUNDALI lines in parallel 6.08IMPEDANCE OF MERAMUNDALI line AT 220 KV BASE Z1 1.8392IMPEDANCE OF MERAMUNDALI NETWORK Z2 11.428571429Z equivalent at 220 kv base =z1+z2 5.2963428571SC CKT IMPEDANCE OF ICT 22.279365079if 2 ICT 's are parallel= 11.13968254z equivalent at 220 kv base= 16.436025397sc ckt CURRENT AT 220 KV BUS 7.7281935354sc ckt CURRENT AT 220 KV BUS 2944.7508647

primery voltage=N1

secondry volt=N2

at 220 kv base=Z2=

FROM GRID INFEED

K2 %z 10014000

3.305785124 315 14.544.444444444 120 12.5

3.4571428571

actual mva

at 220 kv base=Z2=


genarator ratingsmva Xd" kv

168.75 13.50% 13.80.135

Z generator 0.152352transformer(GT)

mva X kv at fault side180 12.50% 220

0.125 value at 180 mva base=



669.1449814126

if 3 generators in II fault mva at 220 kv bus 2007.434944238fault current Isc at 220 kv bus 5.26830501847impedance 24.11037037037

Isc at 220 kv base 12.99933272506794953.26574155989


13.0527743579478746.044371202865


16.9866263041792194.177522608334

0.415 kv bus2 MVA trafoZ 2 MVA 0.00516675




Z equivalent up to .415 kv bus 0.0060536961186163539.626104178881828.4824511616967

fault current Isc at .415 kv bus KAfault MVA at .415 kv bus


CONSTANT1.732

at 220 kv base= 38.72 1000


tota Z up to 220 kv bus= 72.33111111

40.54037037396.1333852

9.771331183

Z equivalent consider grid n genrator both

by impedance method

0.062727270.00393471

z genrator 220 kv base 38.72

268.888889Z GT at 220 kv base 33.6111111

z 220 bus( Z gen+ Z gt) 72.3311111I sc 1.75610167





genarator ratingsmva Xd"

168.75 13.50%0.135

Z generatortransformer(GT)

mva X180 12.50%

0.125



669.1449814126

if 3 generators in II fault mva at 220 kv busfault current Isc at 220 kv busimpedance 24.11037037037

Isc at 220 kv base 12.99933272506794953.26574155989


13.0527743579478746.044371202865


16.9866263041792194.177522608334

0.415 kv bus2 MVA trafoZ 2 MVA 0.00516675Z equivalent up to .415 kv bus 0.00605369611861635

39.626104178881828.4824511616967




fault current Isc at .415 kv bus KAfault MVA at .415 kv bus


kv13.8

0.152352 at 220 kv base= 38.72

kv at fault side220


tota Z up to 220 kv bus= 72.33111111

40.54037037396.1333852

9.771331183

2007.4349442385.26830501847

ict impedance 73.65079365ict's in II 36.82539683at 33 kv base 0.250642857

generators impedance at 400kv base 79.7037037generators impedance at 33kv base 0.542483333total at 400 kv base 116.5291005total at 33 kv base 0.79312619contribution in fault 24.02280748

11884.12717impedance at this fault MVA 13.46333624at 33 kv base 0.091634832total fault current at 33 kv bus 207.9244028

11884.12717

trafo at 33 kv base 0.591847826total Z 0.683482658

27.87651969

Z equivalent consider grid n genrator both

total fault MVA at 400 kv bus consider grid n generator

total fault MVA at 33 kv bus at 230 mva trafo 1593.310359

CONSTANT by impedance method1.7321000 0.06272727

0.00393471z genrator 220 kv base 38.72

268.888889Z GT at 220 kv base 33.6111111

z 220 bus( Z gen+ Z gt) 72.3311111I sc 1.75610167




22.2793650793651 46.3897354497355

at 400 kv base 153.354497354497

fault contribution 1.50596745580424 total Z fault mva

fault contribution 1.98188161728251total contribution 17.153763234565

fault current 17.15376323456512.1212121212121207.924402843212

voltage mva Xdgenerator 13.8 168.5 13.5

GT V1 V2 MVA %Z K(V1/V2) K213.8 220 180 12.5 0.062727 0.003935

GEN Z(OHM) 0.152578GT Z(OHM) 0.13225

Ztotal(gen+gt) 0.284828if all the 3 gen are in II 0.094943 (AT 13.8 KV BASE)

AT 220KV BASE 24.12952 Z1

38 KM LINE Z 12.16 ohmLINES IN II 6.08 Z5

GRID IMPEDANCE 11.42857 Z8

AT 400 KV BUS IN S/YZ5+Z8 17.50857 Z11Z11 II Z7 11.78182

Isc AT 400 KV 19.60196 kAShort circuit MVA 13580.24 MVA

AT 33 KV AT230MVAZ4 II Z11 13.62834 Z13Z13 + Z6 100.5849 AT 400KV BASEAT33 KV BASE 0.684606

Isc AT 33 KV AT230MVA 27.83079MVA 1590.697

MVA V1 V2 K K2 Z%ST 40 6.9 220 0.031364 0.000984 12.5

Z(OHM) 151.252 ST in II 75.625 (AT 220KV BASE)

120 MVA 120 33 220 0.15 0.0225 12.5

Z(OHM) 50.416674 NO 120 in II 12.60417

ICT 315 220 400 0.55 0.3025 14.5

Z(OHM) 22.279372 ICT IN II 11.13968 Z3

Z eq(ST II 120)= 10.8035714297.462408315 Z2

Z2 + Z3 18.602090855AT 400 KV BASE 61.494515222 Z4

230 MVA 230 400 33 12.12121 146.9238

Z(OHM) 86.95652 Z6Z4 II Z6 36.020961923 Z7

Z7 AND Z5 IN SERIES 42.100961923 Z9

Z8 II Z9 8.9885680002 Z10

FAULT AT MERAMUNDALI BUS 25.6934 KA

FAULT MVA 17800.388226

Z eq(ST II120 II Z1 )=

fault calculation

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