1000kV GIS中TA误差试验分析

Test and Analysis of Error Calibration of 1000kV GIS Current Transformer

为研究适合特高压封闭式气体绝缘开关组合电器(GIS)中电流互感器(TA)误差现场试验方案,在借鉴500kV以及750kVGIS变电站中的TA误差试验方法的基础上,同时考虑到特高压GIS站的独特结构以及TA的特性,在特高压TA的误差现场试验中采用了两种不同的接线和无功补偿方式。为了寻求最合理的方式搭配,结合晋东南、南阳、荆门3个站的具体特征对于上述几种情况进行了计算和对比分析,发现不同的接线方式和无功补偿方式对于试验设备的选择产生一定的差异。计算和对比分析结果表明,在1000kV GIS中TA准确度试验中,采用两相串联施加电流组成试验回路加上并联补偿的组合方式在现场检测GIS中TA误差试验中可行。

The purpose of field error calibration test of current transformer is to testify phenomenon of error variability by transporting,installing and using. Because GIS/HGIS are mostly adopted in structure of UHV substations and current transformer in GIS/HGIS is not facility to remove, traditional methods full of current or equal ampereturn are not suitable for error calibration. In order to discuss a compatible test program of UHV TA in field error calibration test , considering special structure of current transformer in GIS/HGIS, there are two connection and two reactive compensation models. To select the optimum suitable program, errors in different connection and reactive eompensateion models are focused after calculating and contrasting in according to structure of Jindongnan, Nanyang, Jingmen substation. The result shows that adopting series connection in nextly phase and parallel compensateion is feasible in field error calibration test of UHV current transformer.