During the operation of 10 kV asynchronous motor

bar-to-bar discharge will be generated because of transverse tear of end-winding

which can generally reduce the insulating properties. In order to solve this problem

a real bar-to-bar discharge model is designed by abrading the junction region between the low resistance layer and the high resistance layer of a real stator winding. The experiment is performed in the electromagnetic shielding room and the distribution patterns of bar-to-bar discharge under different voltages are analyzed. Hot pot distribution in the discharge region is observed and recorded through infrared camera. The research will provide a judging basis for the on-line monitoring and fault diagnosis of the 10 kV three phase asynchronous motors.