一种应用电压—频率转换技术构成数字式电流互感器的方法

A METHOD OF COMPOSING DIGITAL CURRENT TRANSFORMER USING VFC

本文提出一种利用电压—频率转换技术(VFC)构成数字式电流互感器的新方法。其基本思路是把模拟电流转换为电压,然后变成高电位的脉冲频率信号,并用光电设备把此脉冲由高位变成低位,就可利用数字信号处理技术而获得数字电流的量和相位角。实验结果表明这种新型数字电流互感器具有0.5级的精度。

This paper proposes a new approach of digital current transformer using voltage to frequency con- vertion technique(VFC).The primary thought is to convert analog current into voltage and then into pulse frequency signal on high potential and use photoelectric device to transmit the pulse from high to low potential.The digital current in magnitude and phase angle can be obtained from the pulse by using digital signal processing technique.The experimental results show that the new digital current trans- former has the precesion of 0.5 degree.