500kV瓷柱式断路器开关传动机构拐臂断裂原因分析  

Analysis on the Breaking Reason of Crank Arm of Switching Transmission Mechanism of 500kV Porcelain Circuit Breaker

作　　者：张鸿武 冯楠楠 刘蕊 陈阳 ZHANG Hongwu;FENG Nannan;LIU Rui;CHEN Yang(Shandong Electric Power Industry Boiler and Pressure Vessel Inspection Center Co.,Ltd.,Jinan 250003,China;Jinan Jingwei Electric Power Engineering Consulting Co.,Ltd.,Jinan 250021,China)

机构地区：[1]山东电力工业锅炉压力容器检验中心有限公司,山东济南250003 [2]济南经纬电力工程咨询有限公司,山东济南250021

出　　处：《铸造技术》2020年第10期969-973,共5页Foundry Technology

摘　　要：某换流站交流滤波器场500kV瓷柱式断路器开关传动机构拐臂发生了断裂。通过对拐臂断裂部位进行宏观和微观形貌及能谱分析、并对拐臂进行了拉伸力学性能和布氏硬度检测,分析了断裂原因。结果表明,断裂原因是原生铁纯度低,杂质元素含量高,铸造工艺不良,存在大量铸造缺陷,且力学性能较差,不能满足长期运行的要求。为避免同类事故,建议加强监督,严把设备质量关。The arm of the switching mechanism of 500 kV porcelain column circuit breaker in the AC filter field of a converter station was broken.The fracture reasons were analyzed by the macroscopic and microscopic morphology and energy spectrum analysis and the tensile mechanical properties and Brinell hardness test of the arm.The results show that the fracture is caused by low purity of raw pig iron,high content of impurity elements,poor casting process,large number of casting defects,and poor mechanical properties,which could not meet the requirements of long-term operation.In order to avoid similar accidents,it is suggested to strengthen supervision and strictly control the quality of equipment.

关 键 词：换流站 传动机构拐臂 杂质元素含量高 铸造工艺不良 断裂 金属监督 

分 类 号：TG111.91[金属学及工艺—物理冶金]