孙庆峰,屠晔炜,付军,王鑫,刘学广,周进
SUN Qingfeng,TU Yewei,FU Jun,WANG Xin,LIU Xueguang,ZHOU Jin

• 1:浙江省电力锅炉压力容器检验所有限公司
• 2:嘉兴市恒光电力建设有限责任公司
• 3:武汉理工大学
• 4:国网浙江省电力有限公司检修分公司

摘要(Abstract)：

某型1 100 kV断路器合闸电阻触头发生故障，其中两颗短螺栓呈脱落状态，两颗长螺栓断裂分离。通过宏观检查、尺寸测量、金相分析等技术手段，从材料、连接和运行工况等方面进行分析。建立高精度有限元分析模型，考虑长、短螺栓的螺孔高度差异和运行荷载作用，分析其故障成因。结果表明：长、短螺栓材质均完好，但长螺栓呈现明显疲劳断裂形貌。进一步分析发现，当合闸电阻和主动弧触头压气缸完全紧固后，长、短螺栓的螺孔高度差异形成张力，使得长螺栓发生松动，连接板部位产生缝隙，长螺栓在长期分、合闸作用下发生疲劳断裂。螺孔高度差可认定为合闸电阻紧固螺栓断裂的主因。
The contact of the closing resistance of a certain 1 100 kV circuit breaker is faulty. Two short bolts are falling off and two long bolts are broken and separated. By technical means of macro inspection, dimensional measurement, metallographic analysis and so on, the material, connection and operation conditions are discussed, the finite element analytical model with high precision is developed, and the fault cause is analyzed by considering the height difference of bolt hole between long bolt and short bolt and the impact of operation load. The results show that both long bolts and short bolts are intact, but the long bolts show obvious fatigue fracture morphology. Further analysis shows that when the closing resistance and the active arc contact press cylinder are fully fastened, the height difference of bolt hole between the long bolt and short bolt forms the tension, which loosens the long bolt and produces cracks at the connecting plate, thus the long bolts are broken under the action of long-term opening and closing. The height difference of the blot hole can be identified as the main cause of breaking of closing resistance fastening bolts.

关键词(KeyWords)： 特高压;断路器;合闸电阻;螺孔高度差;疲劳断裂;有限元分析
ultra-high voltage;circuit breaker;closing resistor;height difference of blot hole;fatigue fracture;finite element analysis

Abstract:

Keywords:

基金项目(Foundation): 国网浙江省电力有限公司科技项目（5211DS17002B）

作者(Author): 孙庆峰,屠晔炜,付军,王鑫,刘学广,周进
SUN Qingfeng,TU Yewei,FU Jun,WANG Xin,LIU Xueguang,ZHOU Jin

DOI: 10.19585/j.zjdl.202308009

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