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In induction motor, the short circuit test is a ___________ test.
1. Blocked rotor
2. Stator resistance
3. Open circuit
4. No-load

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Correct Answer - Option 1 : Blocked rotor

Blocked rotor or short circuit test:

  • The blocked rotor test of an induction motor is similar to the short circuit test of a transformer
  • The shaft of the motor is locked so that it cannot move and the rotor winding is short-circuited.
  • It is used to find out series branch parameters (R01­ and X01) of equivalent circuit parameters when referred to the primary side (stator) and the full load copper losses (I2R).
  • By applying rated voltage under a blocked rotor test, the motor will take a very high short circuit current which is equivalent to 5 to 8 times the full load current.
  • We need to apply reduced voltage initially and increase the voltage up to the current drawn by the motor reaches the rated current.

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