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FAULT CALCULATION
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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
FROM GENERATOR INFEED
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=
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 5.26830501847impedance 24.11037037037
Isc at 220 kv base 12.99933272506794953.26574155989
120 MVA trafo(33 kv bus)Z 120 mva AT 34.5 KV BASE 1.23984375Z equivalent at 33kv bus 1.45969870162572
13.0527743579478746.044371202865
6.6 kv bus31.5 MVA trafoZ 31.5 MVA 0.165942857142857Zequivalent up to 6.6 kv bus 0.224330805207886
16.9866263041792194.177522608334
0.415 kv bus2 MVA trafoZ 2 MVA 0.00516675
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
Z equivalent up to .415 kv bus 0.0060536961186163539.626104178881828.4824511616967
fault current Isc at .415 kv bus KAfault MVA at .415 kv bus
FROM GENERATOR INFEED
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
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
fault MVA 669.144344
if 3 generators in IIz 220 bus 24.1103704FAULT Isc 5.26830502
fault Mva 2007.43494
FROM GENERATOR INFEED
genarator ratingsmva Xd"
168.75 13.50%0.135
Z generatortransformer(GT)
mva X180 12.50%
0.125
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 busfault current Isc at 220 kv busimpedance 24.11037037037
Isc at 220 kv base 12.99933272506794953.26574155989
120 MVA trafo(33 kv bus)Z 120 mva AT 34.5 KV BASE 1.23984375Z equivalent at 33kv bus 1.45969870162572
13.0527743579478746.044371202865
6.6 kv bus31.5 MVA trafoZ 31.5 MVA 0.165942857142857Zequivalent up to 6.6 kv bus 0.224330805207886
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 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 KAfault MVA at .415 kv bus
FROM GENERATOR INFEED
kv13.8
0.152352 at 220 kv base= 38.72
kv at fault side220
value at 180 mva base= 0.125
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
fault MVA 669.144344
if 3 generators in IIz 220 bus 24.1103704FAULT Isc 5.26830502
fault Mva 2007.43494
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 )=