宁夏电力Issue(1)：8-14,34,8.DOI:10.3969/j.issn.1672-3643.2025.01.002
直流偏磁下电磁式电流互感器传变误差的计算方法
The calculation method for transmission error of electromagnetic current transformer caused by DC bias
摘要
Abstract
This paper addresses the issue of current distortion and increased transmission errors of current transformer caused by DC bias.It proposes a quantitative method for calculating the secondary-side current and transmission error of current transformer affected by DC bias.This method resolves the problem of reduced accuracy in existing calculation techniques when the current transformer experiences significant saturation due to DC bias.The nonlinear magnetization characteristics are divided into unsaturated and saturated regions.By using the relationship between the initial and final values of the TA current curve in both regions,an analytical expression for the secondary-side current of the TA under DC bias is derived.The fundamental component is then solved,enabling the quantitative calculation of the current transformer's angle and ratio differences under DC bias.The accuracy of the theoretical formulas is validated through Simulink simulations.The results also show that as the DC bias current increases,both the ratio difference and angle difference remain stable initially and then increase linearly.关键词
直流偏磁/电磁式电流互感器/饱和现象/传变特性/比差/角差Key words
DC bias/electromagnetic current transformer/saturation phenomenon/transmission characteristics/angle difference/ratio difference分类
动力与电气工程引用本文复制引用
刘亮,刘志远,于晓军,刘思源,李博通..直流偏磁下电磁式电流互感器传变误差的计算方法[J].宁夏电力,2025,(1):8-14,34,8.基金项目
国网宁夏电力有限公司科技项目(5229CG230001) （5229CG230001）
