Statistical Analysis and Discharge Type Identification of Partial Discharge Pulse Parameters of Oil-Paper Insulation Based on Ultra-wideband

Abstract

The effective measurement frequency band of the traditional pulse current method is up to 1MHz, which causes the loss of the main energy frequency band information of the partial discharge pulse signal. In view of this, an ultra-wideband partial discharge pulse measurement system with an effective measurement frequency band of 30kHz-50MHz is designed. The system is used to measure the discharge signals of three types of oil-paper insulation defect models built under laboratory conditions, in order to obtain statistical characteristics that can characterize different types of partial discharge pulse parameters of oil-paper insulation. The results show that: the ultra-wideband partial discharge pulse measurement system can restore the original characteristics of the partial discharge waveform to a greater extent, which is conducive to the accurate analysis of the characteristics of the partial discharge pulse; the measured parameters of different types of partial discharge pulses have different statistical characteristics. Using discharge pulse rise time, fall time, 50% pulse width and 10% pulse width as input characteristic parameters to identify partial discharge types can achieve better results.