Open Access

ARTICLE

External UHF Sensor for GIS PD Insulation Defect from Resin Hole

by Li Xiao^1,2, Xu Yang^1,2,*, Guozhi Zhang^1,2, Lin Cheng^1,2, Yi Jiang^1,2, Chuanxian Luo^1,2, Jing Zhang^1,2

1 Nanrui Group (State Grid Electric Power Research Institute) Co., Ltd., Nanjing, 211006, China
2 Wuhan Nari Limited Liability Company of State Grid Electric Power Research Institute, Wuhan, 430074, China

* Corresponding Author: Xu Yang. Email:

Energy Engineering 2023, 120(5), 1239-1252. https://doi.org/10.32604/ee.2023.025530

Received 18 July 2022; Accepted 09 October 2022; Issue published 20 February 2023

Abstract

In view of the effective perception demand of PD (Partial Discharge) insulation defect of in-service GIS (Gas Insulated Switchgear), the external UHF (Ultra High Frequency, 0.3−3 GHz) sensing technology for GIS PD insulation defect from resin hole is studied in this paper. Firstly, rectangular waveguide theory is used to analyze the electromagnetic wave propagation characteristics from rectangular resin hole in GIS disc insulator. It is found that the energy of leaked electromagnetic wave mainly concentrates in the frequency band above 1 GHz. Then based on this frequency band characteristics, a cavity-backed bowtie sensor for GIS PD external detection is designed optimized by HFSS finite element software, in band of 1–3 GHz, its maximum VSWR is 7, the minimum is 1.1, the average is 2.9, and in band of 0.3–1 GHz, the maximum and minimum VSWR is 42.8 and 7, the average is 20.6. Finally, a sensor prototype is made, its sensitivity experiment is carried out on 220 kV GIS, experimental results show that the designed sensor can stably detect the PD electromagnetic wave signal leaked from the resin hole, and the signal energy in frequency band range is consistent with the theoretical analysis results.

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Keywords

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