不拆线测试500kV CVT介损的附加误差分析

Additional Error Analysis of 500kV CVT Dielectric Loss testing in Non-Open Wire case

通过对不拆线测试CVT介损的具体分析,得出由于线路接地刀闸接触不良而产生一附加电阻Rd,由于Rd的影响使测量结果偏大。建议在进行CVT介质损耗不拆线测试时,应检查接线是否接触良好,特别是线路接地刀闸接触是否良好,以免影响测量结果。

In this paper, through specific analysis of CVT dielectric loss testing in non-open wire case, the cause of larger measurement results is obtained, because of the additional resistance Rd generated by the imperfect contact of line earthing switch. It is suggested that during dielectric loss measurement in CVT non-open wire case, the wiring shall be checked good or not, especially the contact of line earthing switch, so as not to affect the measurement results.