CJEE

Chinese Journal of Electrical Engineering ›› 2024, Vol. 10 ›› Issue (1): 12-20.doi: 10.23919/CJEE.2023.000047

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Characterization of Electrical Tree Degradation of Epoxy Resin under Thermal and Temperature Stresses by Photoelastic Effect*

Hein Htet Aung1#, Yuhuai Wang1#, Jin Li1,*, Ying Zhang2,*, Tatsuo Takada3   

  1. 1. School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China;
    2. Department of Power Generation and Transformation Engineering, Baoding Technical College of Electric Power, Baoding 071051, China;
    3. Measurement and Electric Machine Control Laboratory, Tokyo City University, Tokyo 158-8557, Japan
  • Received:2023-10-10 Revised:2023-11-12 Accepted:2023-11-20 Online:2024-03-25 Published:2024-04-10
  • Contact: * E-mail: lijin@tju.edu.cn, zhangying2019@tju.edu.cn
  • About author:# These authors contributed to this work equally.
    Hein Htet Aung received his B.E. degree in Electrical Engineering from China Three Gorges University, Yichang, China. He is currently working towards his M.E. at the Key Laboratory of Smart Grid of the Education Ministry, School of Electrical and Information Engineering, Tianjin University, China. His research interests include high-voltage insulation, epoxy resin and residual stresses.
    Yuhuai Wang was born in Inner Mongolia, China in 1997. He received the B.S. degree in Electrical Engineering from Inner Mongolia University of Technology in 2018. He has been pursuing a Master's degree at the School of Electrical and Information Engineering at Tianjin University since 2020. His main research interests include insulation and mechanical failures of GIS/GIL.
    Jin Li (M'17) was born in Tangshan, China, in 1988. He received the B.S. and Ph.D. degrees in Electrical Engineering from Tianjin University, Tianjin, China, in 2012 and 2017, respectively.
    From 2017 to 2019, he worked as a Postdoctoral Researcher at Tianjin University. From 2018 to 2019, he was a Visiting Researcher with Tokyo City University, Tokyo, Japan. He is currently an Associate Professor with the School of Electrical and Information Engineering, Tianjin University. His research interests include functionally graded materials, dielectric properties, and the failure mechanisms of epoxy insulation.
    Ying Zhang was born in Baoding, China, in 1996. She received the B.S. degree in Electrical Engineering from Tianjin University, Tianjin, China, in 2022. She is currently an Assistant at the Baoding Technical College of Electric Power Skills Training Center of State Grid Jibei Electric Power Co., Ltd. Her research interests include the mechanism and performance improvement of epoxy resin insulation degradation.
    Tatsuo Takada was born in Yamanashi, Japan, in 1939. He received the B.E. degree in Electrical Engineering from the Musashi Institute of Technology, Japan, in 1963 and M.E. and Ph.D. degrees from Tohoku University, Japan, in 1966 and 1975, respectively. He became a Lecturer, an Associate Professor, and a Professor at Musashi Institute of Technology in 1967, 1974, and 1987, respectively. He was a Visiting Scientist at MIT (USA) from 1981 to 1983 and a Consulting Professor at Xi'an Jiaotong University, China in 1995. He has undertaken several research projects on the development of advanced acoustic and optical methods for measuring the electric charge distribution in dielectrics. For example, investigating the space charge effect in solid dielectric materials, the dynamic surface charge distribution on solid dielectrics, and the electric field vector distribution in liquid insulating materials. He received a Progress Award from the IEE of Japan in 1996. He also received the Whitehead Memorial Award in 1999 for his pioneering work on PEA and gave an Award Lecture at the IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). He received the Chen Jidan Award for his contributions in charge measurement and quantum chemical calculations and gave a plenary speech at the International Conference on Electrical Materials and Power Equipment (IEEE ICEMPE). He is a Life Fellow of IEEE.
  • Supported by:
    * National Natural Science Foundation of China (52377153) and Science and Technology Project of Hebei Education Department (QN2023073).

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Abstract: Epoxy resin is widely used in the support, insulation, and packaging components of electrical equipment owing to their excellent insulation, thermal, and mechanical properties. However, epoxy-resin insulation often suffers from thermal and mechanical stresses under extreme environmental conditions and a compact design, which can induce electrical tree degradation and insulation failure in electrical equipment. In this study, the photoelastic method is employed to investigate the thermal-mechanical coupling stress dependence of the electrical treeing behavior of epoxy resin. Typical electrical tree growth morphology and stress distribution were observed using the photoelastic method. The correlation between the tree length and overall accumulated damage with an increase in mechanical stress is determined. The results show that compressive stress retards the growth of electrical trees along the electric field, while tensile stress has accelerating effects. This proves that the presence of thermal stress can induce more severe accumulated damage.

Key words: Epoxy resin, electrical tree degradation, thermal stress, mechanical stress, photoelastic effects