李胜芳,刘钢,赵福平,付志红.非周期分量下电流互感器的相位特性研究[J].电测与仪表,2012,49(1):8-12. LI Sheng-fang , LIU Gang , ZHAO Fu-ping , FU Zhi-hong.Research on TA Phase Characteristics under Non-periodic Component situation[J].Electrical Measurement & Instrumentation,2012,49(1):8-12.
非周期分量下电流互感器的相位特性研究
Research on TA Phase Characteristics under Non-periodic Component situation
The non-periodic components of current signal in actual power grid can affect the phase transform characteristic of TA.According to the phase characteristic of TA under non-periodic components,the paper analyzes the TA’s phase characteristic on the basis of the nonlinear time domain equivalent circuit model;at the same time,it builds the model of TA’s phase characteristic model,and also makes use of the software of PSCAD/EMTDC to simulate the characteristic and get the TA’s phase characteristic.The simulation result reveals that if there is large non-periodic component in grid,the TA will be transient saturated and the output current will be distortion,the transform phase error increases,which will affect the result of relay protection and electric energy measurement.