磁传感器阵列测量大电流实验系统

电力系统中现有的大电流测量设备往往存在体积大、测量范围窄、绝缘困难等缺陷，故提出了使用磁传感器阵列测量交直流大电流的思路，该测量方法具有体积小、成本低、非接触测量、交直流通用、可数字化输出等优点。为了分析在实际系统中影响该方法测量精度的若干因素，利用基于离散傅里叶变换（DFT）的多相大电流测量算法，设计了大电流实验测量装置，并使用该装置进行了一系列不同母排形状的测量实验，并对各测量环节产生的误差来源进行了理论分析。实验结果验证了本测量方法的有效性。

A High Current Measurement Experimental System Using Magnetic Sensor Arrays

Currently available methods for high current measurement often have shortcomings of large volume,limited measurement range and difficulty in insulation in power systems.Hence the demand of many electrical applications for novel technologies to overcome these problems.To this end,a promising solution is the utilization of magnetic sensor arrays to measure both the AC and DC large current in a power system.Compared with transformers,this approach has such advantages as a smaller size,lower cost,digital output and non-contact measurement.In order to analyze several aspects affecting the measuring accuracy,the poly-phase current measurement algorithm based on the DFT is employed,and the hardware and software frameworks of the experimental measurement system are designed.A series of experiments on different bus-bar cross sections are completed with the experimental system,and the current errors introduced in each step are also analyzed.The experimental results have confirmed the validity of the approach proposed.