Partial discharge inception voltage change in low voltage electric motors Case study: high dc current excitation effect

The paper is about partial discharge inception voltage on low voltage electrical motors. In industry partial discharge inception voltage (PDIV) tests are commonly used in quality control of insulation systems and to guarantee the reliable working condition of serial production goods. The main study area on paper is high DC current excitation effect on motor windings. Firstly, PDIV values are obtained by using PDIV testers which use in industry and then high DC current is applied to one of the motor windings. After these steps, PDIV of motor windings are measured again. Results which are obtained before the DC current excitation and after the DC current excitation are compared to each other. According to the results radical change in partial discharge inception voltage are seen on one of the motor winding which subjected to the high DC current excitation.