Q19. A 33 KV line has a resistance of 4 ohm and reactance of 16 ohm respectively. The line is connected to a generating station bus bars through a 6000 KVA step up transformer which has a reactance of 6%. The station has two generators rated 10,000 KVA with 10% reactance and 5000 KVA with 5% reactance. Calculate (i)the fault current and(ii) short circuit MVA when a 3-phase fault occurs at the h.v. terminals of the transformers and at the load end of the line. (Neglect the voltages) 10,000 KVA 10% 60,000 KVA 33 KV 4+j 16 5% 5.000 KVA O 0.399 p.u., 43.43 MVA O None of the above 0.299 p.u. 33.43 MVA 0.499 p.u. 53.43 MVA FL20, AY2020-2021 Page 4

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189.3L 15.65°KV, 425 L-35.77° A,0.75 lag
lag
Q19. A 33 KV line has a resistance of 4 ohm and reactance of 16 ohm respectively. The line is connected
to a generating station bus bars through a 6000 KVA step up transformer which has a reactance of 6%.
The station has two generators rated 10,000 KVA with 10% reactance and 5000 KVA with 5% reactance.
Calculate (i)the fault current and(ii) short circuit MVA when a 3-phase fault occurs at the h.v. terminals of
the transformers and at the load end of the line. (Neglect the voltages)
10,000 KVA
10%
60,000 KVA
33 KV
4+j 16
5%
5.000 KVA
O| 0.399 p.u., 43.43 MVA
O None of the above
0.299 p.u. 33.43 MVA
口
0.499 p.u. 53.43 MVA
FL20, AY2020-2021
Page 4
h (U.S.)
Transcribed Image Text:189.3L 15.65°KV, 425 L-35.77° A,0.75 lag lag Q19. A 33 KV line has a resistance of 4 ohm and reactance of 16 ohm respectively. The line is connected to a generating station bus bars through a 6000 KVA step up transformer which has a reactance of 6%. The station has two generators rated 10,000 KVA with 10% reactance and 5000 KVA with 5% reactance. Calculate (i)the fault current and(ii) short circuit MVA when a 3-phase fault occurs at the h.v. terminals of the transformers and at the load end of the line. (Neglect the voltages) 10,000 KVA 10% 60,000 KVA 33 KV 4+j 16 5% 5.000 KVA O| 0.399 p.u., 43.43 MVA O None of the above 0.299 p.u. 33.43 MVA 口 0.499 p.u. 53.43 MVA FL20, AY2020-2021 Page 4 h (U.S.)
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