表征开口式电流互感器工作原理的解析模型

发布时间：2019-06-24 22:07

【摘要】：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。
[Abstract]:The traditional current transformer is generally designed with closed magnetic circuit core, but due to the limitation of magnetic saturation of core material, the DC current component will seriously affect the performance of current transformer when a short circuit fault occurs in the primary current circuit, and the error of measuring current value may be very large. By introducing air gap into the magnetic circuit, the magnetic circuit impedance is greatly increased, and the influence of core saturation on the performance of the current transformer can be effectively avoided. Based on the basic magnetic circuit and circuit time domain equation of open current transformer, an analytical model is established to characterize the working performance of open current transformer considering the secondary side load effect. The influence of different parameters of open current transformer on its working performance is discussed. The analytical model has theoretical guiding value for realizing the compatibility between current transformer for measurement and current transformer for protection, and for improving the measurement accuracy of clamp current transformer for on-line detection of watt-hour meter.
【作者单位】：国网天津市电力公司电力科学研究院;清华大学电机系;
【分类号】：TM452

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