注入式定子接地保护补偿参数测定新方法

A New Measurement Method of the Compensation Parameter for Stator Grounding Protection with Low Frequency Injection

低频注入式定子接地保护补偿参数是决定其计算精度的重要因素,目前行业内通行的测试方法所得到的参数,仅在计算的接地电阻定值附近误差较小,定值附近之外误差较大。分析低频注入式定子接地保护原理,研究提出了一种优化的注入式定子接地补偿参数测量方法,该方法原理清晰、过程简单、实测结果准确,在工程应用中效果良好。

The compensation parameter for stator grounding protection with low frequency injection is a key factor which determines the calculation accuracy. However,the values obtained with the commonly adopted measurement methods are usually of big error at some distance away from the calculated grounding resistance value. Considering the working principles of the stator grounding protection with low frequency injection,an optimized measurement method of the compensation parameter is proposed,which is clear in principle,simple in procedure and accurate in measurement results,and has shown satisfactory performance in engineering practice.