When we test the insulation between turns of three-phase asynchronous motor products, we should pay attention to the test in the no-load state, and the following is a simple understanding of the method of insulation test between turns with Senli Motor Xiaobian.

       For dry-wound motor, we should open the rotor winding and test when the rotor is stationary. At this time, the voltage induced by the rotor winding will also be higher than its rated voltage30%This simultaneously tests the interturn insulation of the rotor winding.

       For some multi-speed motors, we should test each rated speed winding separately during the test, if it is a single winding, only the maximum speed connection mode can be tested.

       For motors requiring overspeed tests, the interturn insulation test must be carried out after the overspeed test. The test voltage can be supplied by a transformer or voltage regulator. Under testThree-phase asynchronous motorThe turn is broken down, the damage will be hot, and sometimes there is burnt smell and smoke. The three-phase current imbalance phenomenon can be used to judge the insulation between turns.

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