电压传感器结构设计及误差特性研究

Studies on error characteristic and structure of new voltage sensor

电力系统对电压的测量主要采用电磁式电压互感器,需进行二次变压,才能将电网上的信号变为电子测量装置可用的信号。本文中的电压传感器采用电阻分压,可将初级电压直接转化为10V以内的微信号,以供测量保护用,装置具有体积小、传输频带宽、不存在饱和问题、无谐振点等优点。从路的角度分析了该分压器的误差特性,从场的角度比较了几种传感器结构方案,分析了各方案的幅值误差、相角误差及最大场强,从而得到一种最佳方案,并分析了该方案的幅值误差的频率特性。

The voltage transformer used in power system usually adopts electromagnetic configuration whose output signal can't be directly used by electronic apparatus without further transformation.By adopting resistance divider,the voltage sensor designed in this paper can transform primary voltage into micro-signal less than 10V, which can be used in measurement system directly. By contrast to traditional voltage transformer, it has advantages of smaller volume, wider range of frequency, no saturation and no resonance. In this paper, its error characteristic in electric circuit is analyzed and several designed structures according to calculation of electromagnetic field are compared, the error of peak value, phase and the max. of electric intensity are discussed.