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The rotor reactance in the equivalent circuit is drawn as its standstill value because

  • A.the circuit is referred to supply frequency
  • B.the reactance does not vary with slip in any case
  • C.the rotor current is direct rather than alternating
  • D.the leakage flux is independent of the rotor current

Answer: A

The actual rotor reactance at slip frequency is \( sX_2 \), and referring the circuit to supply frequency is what turns that into the standstill value with the resistance divided by slip. The two adjustments go together.

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