标准电流互感器变比切换装置的设计与实现

Design and realization of ratio switching on standard current transformer

计量用电流互感器是电能计量装置的重要组成部分之一,而比差和角差是实时评估电流互感器检定准确度的重要指标。一旦比差和角差的数值过大,则会导致电能计量误差增大。我国的电力系统对计量用电流互感器的维护和检测工作大部分是由电力计量部门进行的。随着自动检定水平的提升,通过自动拆接线和检测仪器对电流互感器进行检定就成为了亟待解决的问题。目前,接线完毕后切换方式会对检定结果的影响尚没有相关定论。文中通过理论和试验探索了通过磁保持继电器进行电流互感器变比切换的方式对检定准确度的影响,并通过数据分析得出了标准电流互感器的最佳切换方式。

Metering current transformeris an important part in electric energy metering device,the ratio error and phase error are both important index on real-time accuracy evaluation of current transformer.The electric metering error will increase if the ratio error and phase error increase.The maintain and measurement on current transformer are mostly hold by metering department in power system.As the increase of automatic verification level,how to verify the current transformer by auto connection and disconnection wire and detection instrument is a problem to be solved.Currently,whether the switching mode after connection would effect the verification result remain uncertain.This paper explores the influence on verification result of the switching mode using magnetic latching relay by theory and experiment,and figure out the best switching mode of standard current transformer by data analysis.