基于坡莫合金磁芯的电流互感器宽量程实现

摘要

This article introduces the standard current transformer over current problems of magnetic saturation margin direct measuring method based on JJG 1021‐2007“power transformer verification procedures .” By analyzing the parameters of the current transformer error ,the method of an appropriate increase in the secondary winding wire cross‐sectional area and the core cross‐sectional area with using permalloy cores is determined to achieve standard current transformer wide range . The accuracy rating improves one level compared with the original design and the precision of the measuring is 0 .02 level .The over current problem is solved for the current transformer magnetic saturation margin measurement .%针对JJG1021‐2007《电力互感器检定规程》规定的磁饱和裕度的直接测量方法存在标准电流互感器过电流问题，通过对影响电流互感器误差的参数进行分析，确定了用坡莫合金磁芯以及适当增加电流互感器二次绕组的导线截面积、磁芯截面积来实现标准电流互感器宽量程，测量准确度等级较原设计提高了一个等级，测量精度达到0．02级，解决了电流互感器磁饱和裕度的直接测量中标准电流互感器过电流的问题。