Circulating current between two alternators operating in parallel under no-load condition is caused due to:

Option 1: Unequal frequencies

Option 2: Unequal voltages

Option 3: Unequal speeds

Option 4: Unequal loads

Correct Option: 2

Explanation

Under no-load condition, circulating current exists only due to unequal induced voltages. Unequal frequency or speed would prevent synchronization itself.

Circulating current between two alternators operating in parallel under no-load condition is caused due to:

Explanation

In 1-ϕ IM if the slip of motor is S with regard to the forward rotating flux, then its slip with regard to the backward rotating flux will be:

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