基于V-A法的光纤式电流测量仪研究

Study on a New V-A Measurement Based on Electric Current Instrument

提出了一种适用于超高压输电系统的基于V-A法的电流测量方法,并设计了基于该方法的电流测量仪.该仪器的取样元件为输电导线,采用硅钢片作为高压电源的材料,利用光纤隔离高电位和传递测量信息,能观测系统短路电流的波形,测量误差利用最小二乘法进行补偿,其精度高于0.5级.运行结果表明:该仪器的动态性能优于电流互感器,达到了设计要求.

After analyzing the defects of the existing current measurements for transmission line, this paper presented a new method for extra high voltage system current measurement. The new method was based on V- A measurement, and the instrument based on the proposed method was implemented. The transmission line was used as the sampling element, and the silicon steel was used as the material of the high voltage power source in the instrument. The optical fiber was used for the isolation and signal transmission element. The waveform of short circuit current can be observed by the newly developed instrument. The measurement error was compen-sated by recursive least-squares. The accuracy is higher than 0.5 class. The result of field test shows that the instrument has better dynamic performance than current transformers.