220kV电压互感器故障分析及处理

Fault Analysis and Treatment of 220kV Voltage Transformer

电压互感器在电网中的作用是把高电压变为低电压,提供给继电保护和电能计量,它的运行状态的好坏关系继电保护装置能否可靠动作和电能计量的准确度。然而在实际运行中,电压互感器常会发生一些故障,如二次电压出现异常,势必会影响所在电力系统的可靠运行。本文以2个二次电压异常的电容式电压互感器分析及处理为例,对互感器故障检测、分析及解体进行了总结,对其原因做了简要分析,并提出相应对策。

The function of voltage transformer in power grid is to change high voltage into low voltage and provide it to relay protection and electric energy measurement.Its operation state is related to reliable operation of the relay protection device and the accuracy of electric energy measurement.However,in actual operation,voltage transformer often has some faults,such as abnormal secondary voltage,which will inevitably affect the reliable operation of the power system.Taking the analysis and treatment of two capacitor voltage transformers with abnormal secondary voltage as an example,this paper summarizes the detection,analysis and disassembly of the transformers,makes a brief analysis of the causes,and puts forward the corresponding countermeasures.