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A small generating station has a busbar divided into three sections each section is connected to a tie bar with reactor each rated at 5 mVA, 0.1 p.u. reactance. A generator of 8mVA, rating and 0.15 p.u. reactance is connected to each section of the busbar. The short circuit capacit y of the breaker, if a 3 – φ fault takes place on one of the sections of the busbar, will be _________ mVA
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- 7.873 MVA
- 78.73 MVA
- 787.3 MVA
- 7873 MVA
Correct Option: B
Let the base MVA be 8MVA,
Per unit reactance of the generator is 0.15 p.u., and per unit resistance of the reactor
| = 0.1 × | = 0.16 p.u. | |
| 5 |
Equivalent impedance,
| Zeq = | = j0.10161 | |
| j0.465 |
Short circuit capacity
| = | = | = 78.73 MVA | ||
| j0.10161 |
