电网技术Issue(5)：1408-1413,6.DOI:10.13335/j.1000-3673.pst.2014.05.044
直流偏磁对计量用电流互感器的性能影响分析
Analysis of Influence of DC Bias on Instrument Current Transformer
摘要
Abstract
The relationship between the error of instrument current transformer (CT) and its core permeability is derived by T-shaped equivalent circuit based model of CT, and through experiments of ferromagnetic performance the variation law of the relationship between inductance and core permeability of CT under DC bias is attained. An AC/DC hybrid test method is designed to simulate actual DC bias phenomenon, and based on the test data the influence of DC bias on the error of instrument CT is analyzed. Analysis result show that DC bias does not affect the saturation characteristic of the core, and with the increase of DC offset the ratio error curve of CT overall shifts to negative direction while the phase angle error curve of CT overall shifts to positive direction, and the harmonic components at the secondary side of the CT increase, in which even harmonic components increase obviously.关键词
直流偏磁/电流互感器/磁导率/误差/谐波Key words
DC bias/current transformer/magnetic permeability/error/harmonic分类
信息技术与安全科学引用本文复制引用
谭炳源,卢继平,江波,艾兵..直流偏磁对计量用电流互感器的性能影响分析[J].电网技术,2014,(5):1408-1413,6.基金项目
国家电网公司科技项目(GY17-12-016)。Project Supported by Science and Technology Foundation of SGCC(GY17-12-016) （GY17-12-016）
