更换500 kV电流互感器二次应注意的问题

对500 kV电流互感器（TA）更换中二次方面可能出现的保护误动、设备损坏的风险等问题进行总结,为同类工作提供经验.从基本概念和原理出发,结合现场经验和实际案例,阐述了可能出现的问题及造成的后果.介绍了更换TA过程中涉及极性、准确级、保护范围、一次绕组等电位点等方面的正确做法,对作业过程中的风险提出了控制措施.运行维护单位继电保护人员应注意前述各方面问题并做好作业风险控制,才能保证更换TA工作的安全和质量.

Problem Noticed at the Secondary Side during the Replacement of 500 kV Current Transformer

problems on the secondary side such as protection misoperation and device damage risks and so on during the replacement of 500 kV current transformer （TA） are summarized,which can provide experiences for similar work. Possible problems and their consequences are described based on the basic conception and principle and combining with field experiences and actual cases. Correct methods relating to polarity,accuracy class,protection range,isopotential point of primary winding during the replacement of TA are introduced, and risk control measures during the work are proposed. Relay protection operators of the operation and maintenance company should notice problems described above and do the work risk control well to guarantee the safety and quality of the TA replacement work.