开口式电流互感器耐直流性能研究

传统闭合磁路电流互感器易受直流分量影响引起磁饱和,导致测量误差非常大。定义了电流互感器耐直流性能的含义,从开口式电流互感器在考虑二次侧负载条件下的等效模型出发,分析了气隙长度对电流互感器有效磁导率和误差的影响,通过基于J-A模型从B-H磁滞回线分析了开口式电流互感器具有良好的耐直流性能。提出了基于比例直流叠加法的电流互感器耐直流性能检测方法,实验了气隙长度和直流分量对开口式电流互感器性能的影响。文中通过误差补偿使得开口式电流互感器兼顾耐直流性能和计量特性,为电流互感器在含直流分量负荷下准确计量提供理论基础。

Research on Anti-DC Performance of Air-Gap-Core Current Transformer

The traditional closed magnetic circuit current transformer is liable to be influenced by DC component, resulting in magnetic saturation. Anti-DC performance of current transformer is defined in this paper. Based on the equivalent model of air-gap-core current transformer considering secondaly side load conditions, the influence of air gap length on effective permeability and error of current transformer is analyzed. the air-gap-core current transformer has good anti-DC performance from the B-H hysteresis loop based on the J-A model. A method of anti-DC performance of current transformers based on proportional DC superposition is proposed. The influence of air gap length and DC component on the performance of air-gap-core current transformer is tested. The ari-gap-core current transformer takes into account both anti-DC performance and metering characteristics by error compensation, it provides a theoretical basis for the accurate measurement of current transformer under DC load.