A multi frequency point broadband compound antenna for partial discharge detection in gas insulated switchgear

Abstract

In order to meet the requirements of the miniaturized and wide-band antennas for ultra-high frequency (UHF) detection method, a multi frequency point broadband compound antenna for detecting partial discharges (PD) of gas insulated substations (GIS) was designed. Firstly, through the analysis of the principle of miniaturization and broadbandization of the compound antenna, the meander technology was used to realize the miniaturization of the antenna, the multiple radiation unit technology was used to broaden the detection frequency band of the antenna, and the HFSS simulation software was used to simulate the design of the compound antenna. Then we made the antenna object according to the optimized simulation results, and the voltage standing wave ratio (VSWR) of this antenna was tested by vector network analyzer. Finally, the GIS PD test system was built in the laboratory to conduct the actual measurement research on the antenna. The test results show that: The compound antenna has the characteristics of miniaturization, high gain and multi-band. In the frequency range of 1.0 GHz to 3.0 GHz, its VSWR is less than 2, has a wide frequency range, can record most of the PD information. With the increase of frequency, the compound antenna gain is gradually increasing, and the maximum gain of the antenna can reach 6.5 dB, which can effectively receive weak UHF signals. The proposed antenna is quite promising for PD on-line detection applications.