电力系统自动化2017，Vol.41Issue(9)：188-193,6.DOI:10.7500/AEPS20160729016
变压器空投时电子式电流互感器输出励磁涌流波形异常分析
Analysis on Abnormal Magnetizing Inrush Current Output from Electronic Current Transformer When No-load Transformer Operates
郑玉平 1潘书燕 2夏雨 3王中浪 2马玉龙 3龙锋2
作者信息
- 1. 南瑞集团公司(国网电力科学研究院), 江苏省南京市 211106
- 2. 智能电网保护和运行控制国家重点实验室, 江苏省南京市 211106
- 3. 国电南瑞科技股份有限公司, 江苏省南京市 211106
- 折叠
摘要
Abstract
For the no-load transformer operating in a 110 kV substation, the abnormal characteristics of magnetizing inrush current waveform output from the electronic current transformer (ECT) are analyzed.According to the transfer characteristic of lossy integrator in the protection current acquisition system of ECT based on Rogowski coil, the analytical expression of the relation between the time constant and the transmission error is derived.Thus an appropriate integration time constant is selected to achieve 5TPE level accuracy of ECT.A simulation model is developed based on the theoretical analysis.After waveform fitting, it is proved that the main reason of abnormal magnetizing inrush current waveform is the improper integrator time constant of ECT.Meanwhile, the simulation also shows that the ECT with a proper integrator time constant has better transient transfer characteristics.关键词
Rogowski线圈/电子式电流互感器/有损积分器/励磁涌流/时间常数Key words
Rogowski coil/electronic current transformer/lossy integrator/magnetizing inrush current/time constant引用本文复制引用
郑玉平,潘书燕,夏雨,王中浪,马玉龙,龙锋..变压器空投时电子式电流互感器输出励磁涌流波形异常分析[J].电力系统自动化,2017,41(9):188-193,6.
