摘要
液压弹簧操作机构作为高电压等级的主要操作机构,容易出现频繁打压等故障,严重时会导致断路器闭锁,进而扩大故障范围。通过对一起500 kV GIS断路器频繁打压问题分析,现场检查储能控制回路无异常,解体后发现工作缸内壁存在裂纹,导致高压区域与低压区域连通,打压频繁。通过宏观检查、金相检测、能谱分析、材质复核、机械性能检测等方法,深入研究裂纹原因,结合液压机构动作原理及工作缸材料对比,最终确定机构频繁打压原因为工作缸加工质量不佳,成品材料存在相对较多的微观组织缺陷,造成轴向应力集中,导致工作缸出现裂纹。给出了同类型断路器处理方案,以避免相同问题导致设备停运,保证电力系统的安全运行。
As the main operating mechanism of high voltage level,the hydraulic spring operating mechanism is prone to frequent pressure and other failures,and in severe cases,it can cause the circuit breaker to lock,thereby expanding the range of faults.Through the analysis of a 500 kV GIS circuit breaker frequent pressure problem,the on-site inspection of the energy storage control loop is not abnormal,after disassembly,it is found that there are cracks in the inner wall of the working cylinder,resulting in the high pressure area and the low pressure area are connected,and the pressure is frequent.Through macroscopic inspection,metallographic detection,energy spectrum analysis,material review,mechanical performance testing and other methods,the crack causes were deeply studied.Combined with the operation principle of the hydraulic mechanism and the comparison of the working cylinder materials,it was finally determined that the reason for the frequent pressure of the mechanism was the poor processing quality of the working cylinder,and the finished material had relatively many microscopic defects,resulting in axial stress concentration and cracks in the working cylinder.Based on this,the treatment scheme of the same type circuit breaker is given to avoid equipment outage caused by the same problem and ensure the safe operation of the power system.
作者
尚国良
陈营
刘东东
姜磊
袁计委
SHANG Guo-liang;CHEN Ying;LIU Dong-dong;JIANG Lei;YUAN Ji-wei(State Grid Shangdong Electric Ultra-High Voltage Company,Jinan 250000,China)
出处
《电工电气》
2024年第9期64-68,共5页
Electrotechnics Electric
关键词
断路器
工作缸
频繁打压
应力集中
circuit breaker
working cylinder
frequent pressure
stress concentration
