电压互感器二次回路压降影响电能计量的原因分析及应对策略

Analysis of the Causes of Secondary Circuit Voltage Drop of Voltage Transformer Affecting Energy Metering and Countermeasures

分析电压互感器二次回路压降影响电能计量的原因,并提出应对策略。实验采用直接测量法和微分测量法等,检测隔离电压互感器的电压等参数,得出电压互感器二次回路的压降测试结果。电压互感器的熔断器管道两段簧片表面氧化是导致压降的原因之一,部分元件老化也是导致压降的原因,对此采用专用电缆、更换老化涂层和熔断器的应对对策,并且220 kV合闸装置使用特殊电缆线,可以避免电压降低。

The reasons of secondary circuit voltage drop of voltage transformer affecting electric energy metering are analyzed,and countermeasures are put forward.Direct measurement method and differential measurement method are used in the experiment to measure the isolated voltage transformer voltage and other parameters,and the voltage drop test results of the secondary circuit of the voltage transformer are obtained.The surface oxidation of the two sections of the spring of the fuse pipe of the voltage transformer is one of the reasons for the pressure drop,and the aging of some components is also the reason for the pressure drop.For this,the use of special cables,the replacement of aging coatings and fuses are countermeasures,and the use of special cables for the 220 kV closing device can avoid voltage reduction.