Partial Discharge Detection and Defect Location Method in GIS Cable Terminal

Songyuan Li, Pengxian Song, Zhanpeng Wei, Xu Li, Qinghua Tang, Zhengzheng Meng, Ji Li, Songtao Liu, Yuhuai Wang and Jin Li ()
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Songyuan Li: State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
Pengxian Song: State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
Zhanpeng Wei: Power Cable Company, Tianjin 300300, China
Xu Li: State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
Qinghua Tang: State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
Zhengzheng Meng: State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
Ji Li: State Grid Tianjin Electric Power Company, Tianjin 300100, China
Songtao Liu: State Grid Tianjin Electric Power Research Institute, Tianjin 300384, China
Yuhuai Wang: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Jin Li: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

Energies, 2022, vol. 16, issue 1, 1-10

Abstract: The complex structure of gas-insulated switchgear (GIS) cable terminals leads to serious electric field concentration, which is a frequent fault position of a high-voltage cable system. At present, due to the differences in the frequency bands of sensors, various partial discharge detection technologies have certain differences in their scope of application and anti-interference performance, resulting in a low defect detection rate in GIS cable terminals. In this paper, a comprehensive diagnosis scheme is proposed, which integrates transient earth voltage (TEV), ultra-high frequency (UHF), high frequency (HF), and ultrasonic methods. Two abnormal discharge defects of GIS terminals in two 220 kV substations in Tianjin were tracked and monitored, and the joint diagnosis was carried out using the proposed scheme; the type of discharge defect and the phase sequence of the defect were determined, and the UHV was employed to precisely locate and analyze the defect source. Finally, through the disassembly analysis and electric field simulation of the GIS cable terminal, the accuracy and effectiveness of the discharge detection and location method were verified, providing a typical detection demonstration for the defect diagnosis of a GIS cable terminal.

Keywords: GIS cable termination; UHF; joint diagnoses; dissection analysis; electric field distribution (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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