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A 500 M W, 21 k V, 50 H z, 3-phase, 2-pole synchronous generator having a rated p.f.= 0.9 has a moment of inertia of 27.5 × 10³ kg-m². The inertia constant (H) will be
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- 2.44 s
- 2.71 s
- 4.88 s
- 5.42 s
Correct Option: A
| Machine rating (G) = | = | = 555.56 MVA | ||
| cosφ | 0.9 |
| Synchronous speed, Ns = | = 3000 rpm | |
| 2 |
| Stored KE = | × M × |  |  | ² | ||
| 2 | 60 |
| Stored KE = | × 27.5 × 10³ | | | ² | ||
| 2 | 60 |
= 1357.07 MJ
| Inetria Constant,H = | = | = 2.44s | ||
| MVA | 555.56 |
