基于电容分压的电子式电压互感器的研究

Research on Electronic Voltage Transformer Based on Capacitive Voltage Divider

设计了一种 2 2 0kV气体绝缘开关用新型电子式电压互感器 ,互感器由电容分压器和数字变换器两部分组成。电容分压器的输出信号经数字变换器处理后转换为串行数字光信号输出。为提高电压互感器的稳定性 ,采用一小阻值精密电阻与电容分压器的低压固体介质电容并联。实验表明互感器线性度好 ,在 - 15°C～ +45°C温度范围内准确度满足 0 .

A novel electronic voltage transformer used in 220 kV gas insulated switchgear is developed. The transformer consists of a capacitive voltage divider and digital converter. The serial digital signal is transmitted to local control cubicles through an optical fiber. The principle, structure and test results of the transformer are presented in this paper. Test results show that the linearity of the transformer is good, and the accuracy can reach class 0.2 at -15°C～+45°C.