抄録
The next-generation power devices are expected to be used in high voltage applications. And development of high-voltage power module has been promoted. The key issue in high-voltage power module is the existence of partial discharge (PD). PD deteriorates insulating materials for a long time and finally causes dielectric breakdown of power module. Therefore identifying a fragile site such as PD occurring part is important to make products with high reliability. However, high accuracy PD location test for small size high voltage equipment hasn’t been established. To identify PD location in power module, we establish an algorithm of calculating the time difference of each sensor and identifying PD location. Then we investigate an influence of the sampling frequency in the oscilloscope on the identification results.
