Miniaturized Multi-band Compound Antenna for Detecting Partial Discharge in GIS

doi:10.11930/j.issn.1004-9649.202103071

Abstract

Abstract: In order to detect the UHF signal of partial discharge (PD) in gas insulated switchgear (GIS), a multi-frequency point broadband compound antenna was designed for detecting PD in GIS. Firstly, the principle of miniaturization and broadbandization of the compound antenna was analyzed to realize the miniaturization of the antenna. Then the voltage standing wave ratio (VSWR) of the antenna was tested by vector network analyzer. Finally, a GIS partial discharge test system was built in the laboratory to conduct the actual measurement study on the antenna. The test results show that the compound antenna has the characteristics of multi-band, miniaturization and high gain; it has a VSWR of less than 2 with a wide frequency range and can record most of the partial discharge information in the frequency range of 0.75 GHz to 0.90 GHz, 1.23 GHz to 1.48 GHz, 1.78 GHz to 2.12 GHz and 2.42 GHz to 2.79 GHz. with the increase of frequency, the antenna’s gain gradually increases with a maximum gain reaching up to 6.5 dB, which can effectively receive weak UHF signals. It is concluded that the designed antenna has a good performance and is quite promising for PD on-line detection applications.

Key words: UHF, GIS, partial discharge, multi-frequency point, composite antenna, miniaturize

FENG Yang, ZHOU Lei, MA Quanfu, YIN Song, WANG Shuo. Miniaturized Multi-band Compound Antenna for Detecting Partial Discharge in GIS[J]. Electric Power, 2023, 56(4): 167-174.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202103071

https://www.electricpower.com.cn/EN/Y2023/V56/I4/167

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