Analysis of Time Domain Characteristic of Ultra-high Frequency Antenna Sensor Detecting Partial Discharge

摘要

The analysis of time domain signal is a significance method of pattern recognition and fault degree identification in partial discharge (PD) detection. Frequency domain parameters are usually used to judge the performance of ultra-high frequency (UHF) detecting antenna. However, this method is unable to judge the pulse response characteristic of UHF antenna in time domain. The time domain characteristic test system of PD UHF detecting antenna based on reciprocity theorem for antenna is built in this paper. Three time domain judgment parameters of UHF detecting antenna are proposed. The time domain characteristics of four typical ultra-wide band UHF antennas have been tested. The results show that the ridged horn antenna and the Vivaldi antenna present the excellent time domain characteristics and retain the characteristics of signal source maximally. The pulse response test results of four UHF detecting antennas are verified in simulation PD test.