高磁导率比双铁芯电流互感器原理和误差性能研究

不管是太阳风暴引起的地磁电流、直流输电运行产生的地中电流,还是新型非线性负载的接入都有使电网中产生直流分量,而直流会恶化电流互感器的误差特性,最终影响到仪表测量和电能计量的准确度。文章中开展了气隙电流互感器抗直流性能和误差性能的研究,在理论分析的基础上,提出一种结合气隙电流互感器和普通电流互感器的双铁芯电流互感器,建立双铁芯电流互感器的数学模型并阐述其误差性能,最后通过实验验证了双铁芯电流互感器的有效性。

Research of Theory and Error Characters of High Magnetic Permeability Ratio Two Cores Current Transformer

No matter eomagnetically Induced Current (GIC) which is caused by the solar storms or Ground Electrode Current in HVDC Transmission,besides with the connection of the new nonlinear loads areSresultSin DC component in the grid,which leads to deterioration of error characters of current transformer,would influence the accuracy of the instrument measurement and power measuring.This paper developed the research of anti-saturation performance and error characters of the air gapped core current transformer.A two cores current transformer conbines the air gapped core current transformer and trandition current transformer is put forward on the base of Stheoretical analysis.The mathematical model of the two cores current transformer is established and the error characters are analyzed.TheSeffectiveness of the two cores current transformer are validated by experiment at last.