Motor winding short-circuits faults usually have two cases: phase-to-phase short circuit and turn-to-turn short circuit.
1. 1. The phase-to-phase short circuit of the three-phase top of the motor is short-circuited between the two-phase windings in the three-phase winding, which can be measured by telemetry insulation;
2. The turn-to-turn short circuit is a short circuit between the windings of the same phase winding, which cannot be measured by telemetry insulation.
The turn-to-turn short circuit includes a short circuit between the coils of each pole phase group, a short circuit between the coils in one pole phase group, and a short circuit between the turns in one coil. Phase-to-phase short-circuits faults typically have a short-circuit between the winding ends and between the upper and lower coils in the slot. The reason for the phase-to-phase short circuit is that the phase-to-phase insulation size does not conform to the regulations, the insulation pad itself is defective, the interlayer gasket is biased, or the wire is damaged. In addition, insulation damage to the winding or lead-out bushings can also cause phase-to-phase shorts. Motor overload, overvoltage, single-phase operation, poor wire insulation materials, etc., will cause a short circuit between winding turns. In particular, the thermal-mechanical strength of the polyester enameled wire is poor. When the immersion lacquer is poor and the sturdy integral is not formed between the crepe, a large amount of external dust will accumulate in the gap of the wire. As a result, the wire will vibrate with each other under the action of electromagnetic force. The dust stuck in the gap acts as an "abrasive." After a long time, the wire is insulated and broken to form a short day.
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