-
A 2400/240 V, 200 kVA single-phase transformer has a core loss of 1.8 kW at rated voltage. Its equivalent resistance is 1.1 percent. Then, the transformer efficiency at 0.9 pf and on full-load is
-
- 97.57%
- 98.05%
- 97.82%
- 96.56%
Correct Option: C
| = re(p.u.) | |
| kVA rated |
⇒ Pcu-loss = 0.011 × 200 kVA = 2.2 kW
| ∴ η = | |
| 200 × 0.9 + 2.2 + 1.8 |
| = | = 97.2 % | |
| 184 |
