互感器校验仪差流回路负荷对电流互感器检定结果影响的分析与计算  

The Study of Current Transformer Verification Result Influenced by the Difference Current Loop Burden of Transformer Test Set

作　　者：潘洋[1] 林艳[1] 朱力[1] 糜坚平[1] 周力任[1] 来磊[1] 石雷兵[1] 

机构地区：[1]上海市计量测试技术研究院,上海201203

出　　处：《电测与仪表》2011年第6期32-35,53,共5页Electrical Measurement & Instrumentation

摘　　要：不同原理的互感器校验仪其差流回路在结构上存在较大差异,在检定电流互感器时如果不正确地配备互感器校验仪可能会给检定结果引入附加误差。文中分析了数字式互感器校验仪和比较仪式互感器校验仪的原理以及相应的差流回路附加负荷的计算过程。结果表明比较仪式互感器校验仪由于采用线圈检测差流信号,从理论上不会给测量结果带来任何附加误差;而数字式互感器校验仪通过差流电阻采样差流信号,差流电阻上的压降在标准和被测互感器二次侧导纳分流是差流回路负荷给检定结果引入误差的根本原因。The difference current loop burden of transformer test set designed with different principle exist great variety.It will introduce additional error when equipped with improper transformer test set in the process of verification.In this paper,the principles of the digital transformer test set and the comparator transformer test set are analyzed;the methods on how to calculate the correspondent difference current loop additional burden are presented.The result showed that the comparator transformer test set is an ideal measurement instrument which impact nothing additional effect on the standard current transformer and the transformer under test.It is only because the comparator transformer test set utilizes coil to test current signal while the digital transformer test set uses resistance to sample.The admittance current shunt in the secondary of transformer due to voltage drop on the resistance is the main cause to the verification error.

关 键 词：电流互感器 互感器校验仪 差流回路负荷 二次侧导纳 检定 

分 类 号：TM38[电气工程—电机]