500 kV HGIS断路器异响原因分析与处理

Analysis and Treatment of Abnormal Noise in a 500 kV HGIS Circuit Breaker

概述500 kV中枢变电站发生500 kV复合式气体绝缘组合电器(HGIS)断路器在热备用状态下出现短时异响事件的过程。对该断路器于检修现场进行常规检查,机械特性试验,SF6气体组分分析,特高频、超声波局放检测,X射线成像,发现其内部传动拐臂结构异常且有零部件脱落。返厂解体以及对传动结构、均压电容器、弧触头等诊断性检修试验表明,传动转轴卡簧挡圈未装配到位是异响形成的根本原因。最后,对产生异响的原因以及处理过程进行分析总结,提出了针对性的建议与举措。

The short-term abnormal noise process of a 500 kV hybrid gas insulated switchgear(HGIS)circuit breaker in centre 500 kV substation during hot standby state was outlined.Routine inspections,mechanical characteristic tests,SF 6 gas composition analysis,ultra-high frequency and ultrasonic partial discharge testing,X-ray imaging were conducted on the maintenance site of the circuit breaker.It Is found that the internal transmission arm structure Is abnormal and some components Are detached.The disassembly upon returning to the factory and diagnostic maintenance tests on the transmission structure,voltage balancing capacitor,arc contact,has shown that the failure to assemble the circlip retaining ring of the transmission shaft in place is the fundamental reason for the formation of abnormal noise.Finally,an analysis and summary of the causes and handling processes of the abnormal noise are analyzed and summarized,and targeted suggestions and measures are proposed.