用于电子式电流互感器的压频变换积分新方法  

New Voltage-to-frequency Conversion Method for Electronic Current Transformer

作　　者：李伟[1] 尹项根[1] 张哲[1] 陈德树[1] 陈卫[1] 

机构地区：[1]华中科技大学电力安全与高效湖北省重点实验室,湖北省武汉市430074

出　　处：《电力系统自动化》2008年第8期88-92,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50507005)~~

摘　　要：针对目前电子式电流互感器的积分器难以准确反映故障电流暂态过程和传感头需要采样同步信号的问题,提出了压频变换积分新方法。传统压频变换方法可获得压频变换输入端的信号波形,而积分新方法通过压频变换电路、脉冲计数器和微处理器的配合,对计数器的计数值进行处理后可获得输入信号的积分波形,即被测电流波形,从而免去当前电子式电流互感器所用的积分器和采样同步电路。原理推导和仿真结果表明,所提出的压频变换积分新方法能同时实现理想积分和模数转换,并且模数转换方法具有传统压频变换方法难以同时获得的高分辨率和高采样率。To overcome the difficulty for Electronic Current Transformer （ECT） integrator to measure transient fault currents and to get synchronization signals for the sensor head precisely, the paper presents a new voltage-to-frequency conversion method. By using combination of a voltage-to-frequency converter （VFC） circuit, pulse counter and microprocessor, the method can obtain the integration waveform of input signals, i.e. the waveform of the current being measured, and avoid using conventional ECT integrator, sampling synchronization circuit and associated measurement errors. Simulation results show that the method can realize analog-to-digital conversion and integration simultaneously with high resolution and sampling rate in comparison with the conventional voltage-to-frequency method.

关 键 词：压频变换器 ROGOWSKI线圈 电子式电流互感器 积分器 模数转换 

分 类 号：TM452[电气工程—电器]