Research on Verification Technology of Ultra High Frequency Partial Discharge Detecting Sensors

Abstract

More and more substation introduces Ultra-High Frequency (UHF) Partial Discharge (PD) on-line monitoring system and live detection instrument. However the sensors with low gain or SNR (Signal to Noise Ratio) can’t capture the PD signals from the complex background noise. So an objective and comprehensive performance evaluation method for UHF sensor is necessary. Taking advantage of the even electric-field distribution characters in GTEM cell, responsiveness of UHF sensor can be easily achieved. The calibrated steep pulse generator was injected into the GTEM cell, then the output signal of the sensor is connected to the oscilloscope for analysis, the ratio of the output to the input signal can reflect the response of the sensor. In this way the equivalent height was obtained. The evaluation method in this paper is simple, easy to operate, high degree of accuracy and with good repeatability.