电阻式电压传感器的结构设计及误差特性

电磁式电压互感器是电力系统测量电压的主要装置。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。采用电阻分压器来替代电磁式电压互感器, 可将初级电压直接转化为10 V 以内的微信号, 具有体积小、传输频带宽、不存在饱和问题、无谐振点等优点。文中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, 从而得到了一种最佳方案, 并分析了该方案的幅值误差的频率特性。
关键词: 电压传感器; 高电压; 测量
Adopting the resistance divider to substitute the magnetic type PT , the primary voltage can be directly transformed to micro2signal within 10V. It possesses the advantages such as small volume , wide transmission belt of frequency , no saturation problem and without harmonic vibration point etc. The error character of the divider is analysed from the point of circuit , several sensor structure schemes are compared from the point of field ; the error of amplitude , the error of phase angle and the maximum field intensity of individual scheme are analysed , and a optimum scheme is thus obtained. And the frequency chracter of amplitudes of this scheme is analysed.
Keywords : Potential transformer ; High voltage ; Measurement