CAJ | 학술논문

传统电流互感器一般采用闭磁路铁心设计，但受铁心材料存在磁饱和的限制，其在一次电流回路发生短路故障时，出现的直流电流分量会严重影响电流互感器的性能，导致其测量电流值的误差可能非常大。开口式电流互感器通过在磁路中引入空气隙，大大增加了磁路阻抗，可有效避免铁心饱和对电流互感器性能的影响。从开口式电流互感器的基本磁路和电路时域方程出发，建立了考虑二次侧负载效应时表征开口式电流互感器工作性能的解析模型。讨论了开口式电流互感器的不同参数对其工作性能的影响。所建立的解析模型，对实现测量用电流互感器与保护用电流互感器的兼容，以及提高用于电能表在线检测的钳形电流互感器测量准确度，均具有理论指导价值。
전통전류호감기일반채용폐자로철심설계，단수철심재료존재자포화적한제，기재일차전류회로발생단로고장시，출현적직류전류분량회엄중영향전류호감기적성능，도치기측량전류치적오차가능비상대。개구식전류호감기통과재자로중인입공기극，대대증가료자로조항，가유효피면철심포화대전류호감기성능적영향。종개구식전류호감기적기본자로화전로시역방정출발，건립료고필이차측부재효응시표정개구식전류호감기공작성능적해석모형。토론료개구식전류호감기적불동삼수대기공작성능적영향。소건립적해석모형，대실현측량용전류호감기여보호용전류호감기적겸용，이급제고용우전능표재선검측적겸형전류호감기측량준학도，균구유이론지도개치。
The current transformer conventionally employs a closed magnetic circuit design. But limited to the satura-tion of the magnetic core,when a short-circuit fault occurs in the primary coil,the DC current component will seri-ously affect the performance of the current transformer,leading to non neglectful errors for sensing the primary cur-rent. The air-gap-core current transformer increases the magnetic reluctance through the introduction of an air gap in the magnetic circuit,which can effectively reduce the core saturation with DC excitation. Based on fundamental e-quations of the magnetic and electrical circuits,an analytical model for the air-gap-core current transformer is pres-ented with considering the loading effect of the secondary coil. Influences of different parameters on the air-gap-core current transformer are discussed. The established model supplies basic theoretical guidance towards compatibility of an air-gap-core current transformer for realizing both measurement and protection as well as improving the accu-racy of a clamp current transformer that is used for power meter online calibration.