宽频电容式分压器的研制

Development of Broadband Capacitive Voltage Divider

为解决电磁式电压互感器和电容式电压互感器(CVT)在谐波条件下,频率响应差的问题,研制了一台宽频电容式分压器。将2种常用的压缩气体标准电容器形式设计集成于一体。采用电磁场仿真软件完成主绝缘及电容量的设计,并对分压器主体分压比的温度系数进行了理论计算;为提高分压器后级带载能力,设计了具有两级缓冲电路的电压信号处理单元。试验结果表明:分压器满足绝缘设计,并在50~2 500 Hz满足0.1级互感器的误差要求,可用于电力系统内谐波计量。

In order to solve the problem of the frequency response of the electromagnetic voltage transformer and the capacitive voltage transformer （CVT） under harmonic, a broadband capacitive voltage divider has been de- veloped. The two common forms of compressed gas standard capacitor are designed into one close shell. The design of the main insulation and capacity are completed using electromagnetic field simulation software, and theoretical calculation of the temperature coefficient of the voltage ratio is finished. Two-stage buffer circuit is designed to improve the load capability of the voltage divider. The test results indicate that the insulation of the voltage divider can meet the requirement of insulation design, and the accuracy of divider reaches up to the re- quirement of the 0.5 class of the voltage transformer under 2 500 Hz. The divider could be used for the harmonic measurement.