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Power angle characteristic of a salient - pole synchronous machine working with a constant field excitation on an infinite bus system is shown in the given figure. If load on the machine is suddenly changed from P1 to P2 (P2 > P1), then machine will fail to maintain stability if
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- shaded area A1 is greater than shade area A2
- shaded area A1 is equal to shaded area A2
- shaded area A1 is less than shaded area A2
- δm > δ0
- shaded area A1 is greater than shade area A2
Correct Option: A
The answer is based on 'equal area criterion' of stability. If area A1 is greater than the area A2, then machine will fail to maintain stability.
