Phase-Controlled Closing Strategy for UHV Circuit Breakers with Arc-Chamber Insulation Deterioration Consideration

Hao Li, Qi Long, Xu Yang, Xiang Ju, Haitao Li, Zhongming Liu, Dehua Xiong, Xiongying Duan () and Minfu Liao
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Hao Li: EHV Power Transmission Company China Southern Power Grid, Kunming 650214, China
Qi Long: EHV Power Transmission Company China Southern Power Grid, Kunming 650214, China
Xu Yang: EHV Power Transmission Company China Southern Power Grid, Kunming 650214, China
Xiang Ju: EHV Power Transmission Company China Southern Power Grid, Kunming 650214, China
Haitao Li: NR Electric Co., Ltd., Nanjing 211102, China
Zhongming Liu: NR Electric Co., Ltd., Nanjing 211102, China
Dehua Xiong: School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
Xiongying Duan: School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China
Minfu Liao: School of Electrical Engineering, Dalian University of Technology, Dalian 116024, China

Energies, 2025, vol. 18, issue 13, 1-20

Abstract: To address the impact of insulation medium degradation in the arc quenching chambers of ultra-high-voltage SF 6 circuit breakers on phase-controlled switching accuracy caused by multiple operations throughout the service life, this paper proposes an adaptive switching algorithm. First, a modified formula for the breakdown voltage of mixed gases is derived based on the synergistic effect. Considering the influence of contact gap on electric field distortion, an adaptive switching strategy is designed to quantify the dynamic relationship among operation times, insulation strength degradation, and electric field distortion. Then, multi-round switching-on and switching-off tests are carried out under the condition of fixed single-arc ablation amount, and the laws of voltage–current, gas decomposition products, and pre-breakdown time are obtained. The test data are processed by the least squares method, adaptive switching algorithm, and machine learning method. The results show that the coincidence degree of the pre-breakdown time obtained by the adaptive switching algorithm and the test value reaches 90%. Compared with the least squares fitting, this algorithm achieves a reasonable balance between goodness of fit and complexity, with prediction deviations tending to be randomly distributed, no obvious systematic offset, and low dispersion degree. It can also explain the physical mechanism of the decay of insulation degradation rate with the number of operations. Compared with the machine learning method, this algorithm has stronger generalization ability, effectively overcoming the defects of difficult interpretation of physical causes and the poor engineering adaptability of the black box model.

Keywords: insulation degradation product; synergistic effect; mixed gas; phase-controlled closing; pre-breakdown (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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