利用SF_6气体分解物对断路器运行状况进行诊断的方法探讨  

Operational Status Evaluation of Circuit Breaker by Detecting SF_6 Decomposition Products

作　　者：李晓峰[1] 霍凤鸣[1] 甄利[2] 

机构地区：[1]河北省电力研究院,石家庄050021 [2]河北省电力公司,石家庄050021

出　　处：《高压电器》2011年第1期103-105,共3页High Voltage Apparatus

摘　　要：个别SF6柱式断路器在运行中曾发出断续的声响,解体后发现声响原因为绝缘拉杆金属接头的轴销与轴孔产生悬浮电位,产生间歇放电并发出声响,导致轴销和轴孔腐蚀严重,甚至被腐蚀断裂。针对该类缺陷,曾利用特高频、声波、人工耳听等方法对在运设备进行诊断,但收效甚微,人工耳听还容易误判或漏判。笔者通过对一起SF6断路器拉杆轴销断裂故障原因及后续治理方法的分析,提出通过对SF6气体分解物进行检测分析来判断断路器运行状态的方法,早期发现断路器内部轴销及轴孔腐蚀隐患,同时通过实际案例验证了该方法的有效性和实际意义。Discontinuous sound had been heard in some SF6 pillar circuit breakers during operation. By disassembling these breakers, this sound was found to be caused by the intermittent discharge due to the suspension potential between the axle pin and hole of the metal joint on an insulated draw rod. The discharge eroded or even broke the axle pin and hole. UHF, ultrasonic and hearing detection methods have been used to diagnose this fault, however the results were not satisfactory, and the hearing method might bring about misjudgement. Through the analysis of an axle pin fracture fault of draw rod on an SF6 pillar circuit breaker and the treatment method, this study presented a method for evaluating operational status of the breakers by detecting the SF6 decomposition products in order to detect and eliminate early internal-discharge in the breakers. This method was validated by a real case.

关 键 词：断路器 运行状态 SF6分解物 检测方法 

分 类 号：TM561[电气工程—电器]