电流互感器铁心剩磁测量方法研究

Research on the Method of Measuring Residual Flux in the Core of Current Transformer

剩磁是影响电流互感器传变特性的重要因素,剩磁测量对于电流互感器的应用有着重要的意义。为了有效地测量电流互感器铁心剩磁及相关系数,提出了一种利用交流电压源进行剩磁测量的方法。剩磁测量过程使用交流对电流互感器进行充磁,使其达到深度饱和状态。记录电流互感器感应电压,绘制铁心磁通变化曲线,计算电流互感器剩磁及剩磁系数。试验结果表明测得电流互感器剩磁及剩磁系数与理论分析一致,该方法可以准确地测量电流互感器剩磁。

The residual flux is an important factor which affects the transfer characteristic of current transformer. The measuringresidual flux is of important significance to the application of current transformer. In order to effectively measure residual fluxand its coefficient,a new method to measure residual flux with alternating current voltage source is proposed. In the process ofmeasuring residual flux,the current transformer is deeply magnetized by applying alternating current. By recording the inductionvoltage of current transformer and drawing the curve of core flux,the residual flux and its coefficient are calculated. Theexperimental results show that the measured residual flux and its coefficient is consistent with theoretical analysis. Besides,theproposed method can accurately measure residual flux of current transformer.