Question

Viva Questions:
1) Define XI.
2) What are the effects of negative currents on the rotor (field) winding?​

Answer 1

Answer:

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Explanation:

1. the 14th letter of the Greek alphabet is called XI

2. negative-sequence quantities have a rotation opposite that of the power system. This reversed rotating stator current induces double frequency currents in rotor structures. The resulting heating can damage the rotor very quickly