基于信号注入法的对地电容检测系统  

Measuring capacitive current system based on injecting signal approach

作　　者：李毅敏[1] 蔡旭[1] 

机构地区：[1]上海交通大学电气系,上海200240

出　　处：《电工技术》2007年第3期31-34,共4页Electric Engineering

摘　　要：在中性点经消弧线圈接地的中压配网里,为了使接地故障时的补偿达到最好的效果,必须准确检测配网的对地电容。而利用信号注入法测量中压配网的对地电容,具有诸多其他方法所不具备的优点,且可达到所要求的精度。本文设计了一套新型的基于DSP控制芯片和智能功率模块IPM的变频恒流信号源检测系统。试验结果表明,该测量系统工作稳定,可控性强,精度高。In the distribution network with neutral grounding via arc suppression coil, for the purpose ot getting the oest compensation result in the ground fault, the capacitive current of the network must be detected correctly, And the injecting approach on measuring the capacitive current meets this target and has much advantage related to other methods, This paper poses an innovative measuring system based on fixed-current variable-frequency signal source design with DSP and IPM. And the experiment result shows this signal source possesses the outstanding controllable ability and high accuracy.

关 键 词：对地电容检测 变频恒流源 DSP IPM 

分 类 号：TM921.51[电气工程—电力电子与电力传动]