电力系统保护与控制2017，Vol.45Issue(3)：139-143,5.DOI:10.7667/PSPC160131
基于分段拟合算法的电流互感器误差研究
Research on the error of current transformer based on subsection fitting algorithm
周雪青 1郝晓光 1张岩坡 2赵宇皓1
作者信息
- 1. 国网河北省电力公司电力科学研究院,河北石家庄050021
- 2. 国网河北省电力公司检修分公司,河北石家庄050071
- 折叠
摘要
Abstract
Proper transform of Current Transformer (CT) is the precondition for the proper operation of protective relays.However,the field test data can not be directly used to predict the excitation current when large short circuit current,it's hard to make a quantitative evaluation or exact calculation of CT error.A comprehensive analytic expression of three spline interpolation and exponential function is proposed.It uses a subsection processing to fit Ⅰ-V character curve,which can completely describe the linear and saturation regions of Ⅰ-Ⅴ character and obtain the excitation voltage and current value of the saturated region,thus it can calculate the transmission error and the maximum allowable load of the current transformer when short circuit fault occurs.After verification with the measured data,the measured data can be well fitted and the calculated results are accurate.Results show it has a good engineering application value.关键词
电流互感器/10％误差曲线/伏安特性曲线/分段拟合Key words
current transformer/10％ error curve/V-A character curve/subsection fitting引用本文复制引用
周雪青,郝晓光,张岩坡,赵宇皓..基于分段拟合算法的电流互感器误差研究[J].电力系统保护与控制,2017,45(3):139-143,5.
