Fatigue Life Estimation of Critical Components in a Motor-Energized Spring Operating Mechanism Based on Theory of Reliability

Hongming Ma, Guochao Qian, Jie Zhang, Jiali Chen, Fusheng Zhou, Pengfeng Qiu, Aohua Zhang, Ting Wang, Xiaofei Yao and Zhiyuan Liu ()
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Hongming Ma: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650032, China
Guochao Qian: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650032, China
Jie Zhang: China Southern Power Grid Research Institute, Guangzhou 510663, China
Jiali Chen: China Southern Power Grid Research Institute, Guangzhou 510663, China
Fusheng Zhou: China Southern Power Grid Research Institute, Guangzhou 510663, China
Pengfeng Qiu: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650032, China
Aohua Zhang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Ting Wang: Xi’an High Voltage Appararus Research Institute Co., Ltd., Xi’an 710077, China
Xiaofei Yao: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Zhiyuan Liu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2024, vol. 17, issue 7, 1-16

Abstract: High-voltage switchgear is a key control and protection unit in power systems. The reliable operation of the operating mechanism is essential for the reliable opening and closing of the switchgear. This is a vital guarantee for the safety and stability of the power systems. The spring operating mechanism is a commonly used actuator for circuit breakers at 12–252 kV. However, a reliability estimation method that is convenient, practical and accurate is still lacking. The aim of this paper is to explore a reliability estimation method based on a stress–strength interference reliability theory and a fatigue life theory. The changing rules of the reliability of the main axis, and the closing pawl and opening pawl in the spring operating mechanism during operations, are achieved. The accuracy of the calculated reliability based on theories of stress–strength interference and fatigue life is verified by adopting a test data statistical reliability model based on Weibull distribution. The results show that the reliability estimation method based on stress–strength interference and fatigue life theories has a high degree of confidence. The maximum tolerance is 0.024. The study would help in providing a useful reference for the optimization and durability estimation of a spring operating mechanism and its key components in high-voltage circuit breakers.

Keywords: high-voltage circuit breaker; motor-energized spring operating mechanism; fatigue life; mechanical reliability (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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