Evaluation on the Long-Term Operational Reliability of Closing Springs in High-Voltage Circuit Breakers

Mingkun Yang, Liangliang Wei, Pengfeng Qiu, Guangfu Hu, Kun Yang, Xiaohui He, Zhaoyu Peng, Fangrong Zhou, Yun Zhang, Jie Luo and Xuetong Zhao ()
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Mingkun Yang: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650200, China
Liangliang Wei: State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Pengfeng Qiu: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650200, China
Guangfu Hu: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650200, China
Kun Yang: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650200, China
Xiaohui He: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650200, China
Zhaoyu Peng: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650200, China
Fangrong Zhou: Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650200, China
Yun Zhang: Yuxi Power Supply Bureau of Yunnan Power Grid, Yuxi 653100, China
Jie Luo: Yuxi Power Supply Bureau of Yunnan Power Grid, Yuxi 653100, China
Xuetong Zhao: State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China

Energies, 2025, vol. 18, issue 7, 1-12

Abstract: As a key energy storage component in high-voltage circuit breakers, closing springs are susceptible to stress relaxation, resulting in a decline in closing performance due to high operational loads, prolonged usage, and environmental factors. In this work, the 60Si2CrVA alloy steel springs used in 110 kV high-voltage circuit breakers were utilized to study their mechanical behaviors under various temperatures, salt spray corrosion, and repeated closing operations. It is found that the conditions of salt spray corrosion, and repeated closing operations demonstrate a slight impact on its stress loss, while the operation temperature above 70 °C will result in an apparent increase in the stress loss rate. A threshold for closing failure related to the spring’s stress loss rate was established, and a life prediction method based on an improved Arrhenius acceleration model was proposed. The results indicate that the calculated service life of the spring is approximately 27.09 years based on the stress loss rate threshold of 4.5%. This work provides a novel method to evaluate the long-term operational state and service life of closing springs in high-voltage circuit breakers.

Keywords: springs; high-voltage circuit breaker; stress loss; Arrhenius acceleration model (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: 2025
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