In the short-circuit test, we need to control the rotor with brakable equipment, so that the rotor of the three-phase asynchronous motor is fixed, and then the output voltage of the three-phase voltage regulator is gradually increased from zero. When the current reaches the rated current of the motor, the boost voltage is stopped, and the voltage is called the short-circuit voltage.

       For example, the rated voltage is380VWhen the motor is short circuited, the voltage display is generally in75-90Between volts, if the short circuit voltage is too high, it means that the leakage reactance is too large, which isThree-phase asynchronous motorThe stator winding is caused by too many turns; The short circuit voltage is too low, indicating that the leakage reactance is too small, which is caused by too few turns of the stator winding.

       If the three-phase current is not balanced, you can slowly turn the rotor; If the size of the three-phase current changes in turn, the rotor may be broken, and the rotor should be checked.

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