摘要
某500 kV变电站断路器在复役启动过程中发生SF_(6)气体泄漏,检查发现该断路器操动机构拐臂支撑座断裂破损,采用宏观检查、成分分析、电镜扫描等技术对操动机构失效部件进行检测,分析结果表明,操动机构拐臂支撑座化学成分偏析,铸造工艺存在缺陷,长期分合闸动作使拐臂支撑座在动力作用下开裂失效,在合闸过程中发生断裂破损,引起拐臂轴承发生轴向偏移,导致操动机构传动系统自平衡失效,连杆随合闸指令继续动作,在机构传动系统力平衡失效基础上产生剪切力,受其影响,传动部件间发生机械卡涩,最终使分合闸指示牌击破机构外壳,引发气室内部SF_(6)气体泄漏。
A 500 kV substation circuit breaker experiences an SF_(6)gas leakage fault during its re-energization startup process.The inspection finds that the swing arm support seat of the circuit breaker operating mechanism is broken.It detectes the failure parts of the operating mechanism by macroscopic inspection,component analysis and electron microscope scanning.The results of analysis indicate that the arm support bracket of the operating mechanism has a chemical composition segregation,and the casting process had defects.Long-term opening and closing action causes the support seat of the lever arm to crack and fail under dynamic action.During the current closing process,the arm support bracket fractures and breaks,causing the arm bearing to shift axially,which leads to the failure of the operation mechanism transmission system's self-balance.The linkage continues to move under the instruction of closing,the shearing force generated by the failure of the force balance system.Affected by this,the mechanical jamming occurres between the transmission parts,ultimately causing the impact of the trip indicator on the enclosure and the escape of SF_(6)gas from the gas chamber.
作者
孙庆峰
朱海貌
杨勇
鲁旷达
陈宜斌
SUN Qingfeng;ZHU Haimao;YANG Yong;LU Kuangda;CHEN Yibin(Zhejiang Electric Power Boiler&Pressure Vessel Supervision and Inspection Institute Co.,Ltd.,Hangzhou,Zhejiang 310014,China;Wenzhou Power Supply Company of State Grid Zhejiang Electric Power Co.,Ltd.,Wenzhou,Zhejiang 325088,China;Huaneng Tongxiang Gas Turbine Thermal Power Co.,Ltd.,Tongxiang,Zhejiang 314513,China;Electric Power Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou,Zhejiang 310014,China)
出处
《东北电力技术》
2025年第8期55-59,共5页
Northeast Electric Power Technology
基金
浙江省电力锅炉压力容器检验所有限公司科技资助项目(GJRD2022-01)。
关键词
断路器
操动机构
化学成分偏析
铸造缺陷
SF_(6)泄漏
circuit breaker
operating mechanism
chemical composition segregation
casting defects
SF_(6)leakage
