三相组合互感器误差校验中的影响量分析

Analysis of Influence Quantity in Error Detection of Three-Phase Combined Transformer

用三相检定法对三相组合互感器进行误差校验试验,研究高电压和大电流对电压互感器部分误差校验的影响.结果表明:三相检定法能够成功检测出三相三元件组合互感器中电压互感器与电流互感器彼此干扰造成的误差;电压互感器与电流互感器误差校验时,相互之间均会产生一定的影响,且大电流对电压互感器的影响更大.最后,指出采用的标准电流互感器及升流变压器均应按高电压配备绝缘,产品设计时应注意将电压互感器置于正确位置,使其铁心柱轴向与经过其顶部的载流导体方向平行.

Three-phase method was used to detect the error of three-phase transformer,and the effect of high voltage and large current on part of the error detection of current transformer and voltage transformer is discussed.The result shows that the three-phase method can test the error caused by voltage transformer and current transformer in three-phase combined transformer successfully.While using voltage transformer and current transformer for error detection,there will occur some error due to the interruption.And it must be pointed out that the effect of large current on voltage transformer is more obvious than that of the high voltage on current transformer.At last,the standard current transformer and enlarge-current transformer used in experiments must be equipped with high voltage insulation unit.And the voltage sensor must be placed in accurate position during the product design process,furthermore the axis of iron stick is parallel with the conductor on the top.