用于电流型电子式电压互感器的积分电路

摘要

积分电路是电流型电子式电压互感器（EVT）中实现信号还原的关键环节，其性能直接影响互感器的稳态和暂态特性。提出了一种应用于电流型EVT的带隔直控制的积分电路，可以有效隔离输入信号中的直流成分，改善互感器的暂态性能；而且其带宽可满足40次以下谐波电压测量的要求。并提出利用热敏电阻对积分电路进行温度补偿的方法，提高了电流型EVT的工作稳定性。基于本文设计的积分电路研制了电流型EVT样机，并进行了试验。仿真和试验结果验证了该积分电路的实用性和有效性。%Integral circuit is the key element to restore the signal in the current-based electronic voltage transformer(EVT) , and its performance directly affects the steady and the transient characteristics of the EVT .An integral circuit with DC-isolating con-trol used in the current-based EVT was proposed .It can effectively block the DC component of the input signal ,resulting in the im-provement of the transient performance of the EVT .And its frequency width can assure below 40th harmonic voltage measurement . The method of using the thermal resistor to compensate the temperature characteristic of the integral circuit was also proposed ,which can improve the stability of the EVT .An EVT prototype based on the designed integral circuit was developed and then tested .The analysis and then experimental results demonstrated the practicability and the validity of the proposed integral circuit .