一种用于电子式电流互感器的信号处理方法

提出了一种用于电子式电流互感器的信号处理方法。该方法在光强调制原理的基础上,通过将光强调制时的直流偏置信号作为参考信号,利用发光管及光电管的线性区,将高压侧模拟信号调制后的光信号直接传输至低压侧;可以根据参考信号的衰减计算交流信号的衰减,由此解决了使用模拟光信号进行测量时存在的精度较低的不足。可用于电子式电流互感器的设计以实现母线电流的测量。介绍原理及实现过程,并对系统设计的关键问题进行了分析。实验表明,该方法可用于测量及保护用电子式电流互感器的设计。

A Signal Processing Method for Electronic Current Transformer

A signal processing method used in electronic current transformer design is proposed in this paper. The method based on the principle of modulation of light intensity can transfer the analog optical signal modulated at the high voltage side to low voltage side directly, which using the DC offset signal as a reference signal and using the linear area of luminous tube and phototube; the method can calculate the attenuation of AC signal according the attenuation of DC signal, which solving the low precision problem existed in the measurement field using analog optical signal. The method can be used in the design of electronic current transformer to measure the bus current. The design principle and realization process of the method are introduced, the key techniques of the system design are analyzed. The experimental results show that the method can be used in the design of electronic current transformer for measurement and protection.