Electrical Tree and Partial Discharge Characteristics of Silicone Rubber Under Mechanical Pressure

Jingang Su (), Peng Zhang, Zhen Liu, Xingwang Huang, Xianhai Pang, Zeping Zheng () and Tao Han
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Jingang Su: State Grid Hebei Electric Power Co., Ltd., Electric Power Science Research Institute, Shijiazhuang 050022, China
Peng Zhang: State Grid Hebei Electric Power Co., Ltd., Electric Power Science Research Institute, Shijiazhuang 050022, China
Zhen Liu: State Grid Hebei Electric Power Co., Ltd., Electric Power Science Research Institute, Shijiazhuang 050022, China
Xingwang Huang: State Grid Hebei Electric Power Co., Ltd., Electric Power Science Research Institute, Shijiazhuang 050022, China
Xianhai Pang: State Grid Hebei Electric Power Co., Ltd., Electric Power Science Research Institute, Shijiazhuang 050022, China
Zeping Zheng: School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Tao Han: School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

Energies, 2024, vol. 17, issue 22, 1-13

Abstract: Silicone rubber (SIR) is a crucial insulating material in cable accessories, but it is also susceptible to faults. In practical applications, mechanical pressure from bending or shrinking can impact the degradation of SIR, necessitating the study of its electrical tree and partial discharge (PD) characteristics under such pressure. This work presents the construction of a test platform for electrical trees under varying pressures to observe their growth process. A high-frequency current transformer is used to measure PD patterns during tree growth, enabling analysis of the effect of PD on tree initiation and propagation under pressure. The experimental results demonstrate a significant decrease in tree inception probability and increase in PD inception voltage under pressure. The pressure also influences the tree structure and PD during the treeing process, where the longest tree with a branch-like structure appears under 800 kPa. The effect of pressure on electrical tree and PD characteristics can be attributed to changes in free volume, alterations in air pressure within the tree channels, and the affected charge accumulation.

Keywords: silicone rubber; electrical tree; partial discharge; mechanical pressure; cable (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: 2024
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