接线错误对抽头式电流互感器变比影响分析

Analysis of Influence of Connection Error on Transformation Ratio of Tap Type Current Transformer

抽头式电流互感器二次绕组接线错误时有发生,其非工作抽头接入不同的负荷对工作绕组变比特性的影响规律尚未深入分析。采用理论分析和试验相结合的方式深入分析非工作抽头接入不同的负荷对抽头式电流互感器变比特性的影响规律。结果表明,一次电流与工作绕组电流的比值同非工作抽头接入的负荷呈正向线性关系,一次电流与非工作绕组电流的比值同非工作抽头接入的负荷呈反比关系。该结果可为非工作抽头接入下电流互感器的防窃电分析等提供技术参考。

The connection error of secondary winding will seriously affect the transformation ratio characteristics of tap type current transformer.The influence regulation of different loads connected to the non-working connection on the transformation ratio of tap type current transformer has not been studied in depth,which leads to the inaccurate analysis on the changes of transformation ratio of tap type current transformer when the non-working connection is connected.Theoretical analysis and test are used to analyze the influence of different loads connected to non-working connections on the transformation ratio characteristics of tap type current transformer.The results show that the ratio of primary current to working winding current has a positive linear relationship with the load connected to the non-working connection,and the ratio of primary current to non-working winding current has an inverse relationship with the load connected to the non-working connection.The results can provide a technical reference for power stealing analysis of current transformer when the non-working connection is connected.