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A three-phase, 4-pole, self excited induction generator is feeding power to a load at a frequency f 1. If the load is partially removed, the frequency becomes f 2. If the speed of the generator is maintained at 1500 rpm in both the cases, then
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- f1 , f2 > 50 Hz and f1 > f2
- f 1 < 50 Hz and f2 > 50 Hz
- f 1 , f2 < 50 Hz and f2 > f1
- f1 > 50 Hz and f2 < 50 Hz
Correct Option: C
Initially self excited generator supply power to a load at f 1. If load is partially removed then slightly speed increase, also frequency f 2
∴ f 2 > f 1
But both cases f 1 f 2 < 50Hz
