弧触头烧蚀程度对灭弧室内短路开断过程多物理场的影响

孙尚鹏; 相中华; 吴强; 王羽; 倪辉; 牛勃; 刘北阳; 黄河

孙尚鹏,相中华,吴强,王羽,倪辉,牛勃,刘北阳,黄河.弧触头烧蚀程度对灭弧室内短路开断过程多物理场的影响[J].电测与仪表,2024,61(6):103-110.
SUN Shangpeng,XIANG Zhonghua,WU Qiang,WANG Yu,NI Hui,NIU Bo,LIU Beiyang,HUANG He.Influence of arc contact ablation degree on multi-physical field of short-circuit breaking process in arc extinguishing chamber[J].Electrical Measurement & Instrumentation,2024,61(6):103-110.

弧触头烧蚀程度对灭弧室内短路开断过程多物理场的影响

Influence of arc contact ablation degree on multi-physical field of short-circuit breaking process in arc extinguishing chamber

DOI：10.19753/j.issn1001-1390.2024.06.014

中文关键词: SF6断路器触头烧损多物理场耦合仿真电弧复燃

英文关键词:SF6 circuit breaker, contact ablation, multi-physics coupling simulation, arc reignition

基金项目:国家电网有限公司总部科技项目(750kV滤波器组断路器电寿命评估及状态检修策略研究,5500-202135125A-0-0-00)

作者中文名	作者英文名	单位
孙尚鹏	SUN Shangpeng	国网宁夏电力有限公司电力科学研究院
相中华	XIANG Zhonghua	国网宁夏电力有限公司
吴强	WU Qiang	武汉大学电气与自动化学院
王羽	WANG Yu	武汉大学电气与自动化学院
倪辉	NI Hui	国网宁夏电力有限公司电力科学研究院
牛勃	NIU Bo	国网宁夏电力有限公司电力科学研究院
刘北阳	LIU Beiyang	中国电力科学研究院有限公司
黄河	HUANG He	中国电力科学研究院有限公司

摘要点击次数: 734

中文摘要:

为研究SF6断路器开断过程中弧触头烧蚀程度对灭弧室内多物理场变化的影响，建立了弧触头接触行程分别减小0、5 mm、10 mm和15 mm下灭弧室内开断过程的多物理场耦合仿真模型，获得了短路电流开断过程中灭弧室内温度、气流和电场分布特性。计算结果表明：开断过程中，弧道最高温度出现在弧根处，其值随弧触头烧蚀程度变化不大；随着弧触头烧蚀程度的加剧，SF6气体最高速度不断减小，吹弧效果减弱；最大场强集中在静弧触头端部或动弧触头弧角处，且随弧触头烧蚀程度加剧而畸变更严重。基于此，根据流注理论的气体击穿判据计算了不同弧触头烧蚀程度下SF6介质恢复特性，发现当弧触头接触行程减小15 mm时，临界击穿电压低于瞬态恢复电压，触头间隙可能再次击穿造成电弧重燃。研究结果可为SF6断路器电寿命退化机理提供理论支撑。

英文摘要:

In order to study the influence of the arc contact ablation degree on the multi-physical field changes in the arc extinguishing chamber during the breaking process of the SF6 circuit breaker, it is established multi- physical field coupling simulation models of breaking process in arc extinguishing chamber that the arc contact stroke is reduced by 0, 5 mm, 10 mm and 15 mm. The multi-physics coupling simulation model of the process obtains the temperature, airflow and electric field distribution characteristics in the arc extinguishing chamber during the short-circuit current interruption process. The calculation results show that, during the breaking process, the highest temperature of the arc appears at the arc root, and its value changes little with the degree of ablation of the arc contact; with the increase of arc contact ablation, the maximum velocity of SF6 gas decreases and the arc blowing effect decreases; the maximum field strength is concentrated at the end of the static arc contact or the arc corner of the moving arc contact, and the distortion becomes serious with the ablation of the arc contact. On this basis, according to the gas breakdown criterion of the streamer theory, the recovery characteristics of the SF6 medium under different arc contact ablation levels are calculated, and it is found that when the arc contact stroke is reduced by 15 mm, the critical breakdown voltage is lower than the transient recovery voltage, the contact gap may break down again and cause the arc to reignite. The research results can provide theoretical support for the degradation mechanism of the electrical life of SF6 circuit breakers.

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