As industrial motors or EV motors are used for long hours and under varying environmental conditions suchas temperature and humidity, features like high durability andreliability are mostcritical.Temperature is also one of the key factors to influence insulation. If corona discharge occurs in turn-to-turn and turn-to-ground, it would cause the insulation to deteriorate due to the increase in heat andmaterial qualitative change. Adding Corona Discharge Detection in hipot testing exceeds the quality requirements for insulation by detecting units with poor insulation early thus reducing the defect rate caused by long-term usage. The image shows Corona Discharge in a motor.

Corona discharge in motor