电阻分压型电子式电压互感器误差分析及对电能计量的影响研究

电子式电压互感器的准确度关系着电力系统的安全稳定运行和电能的准确计量。由于技术尚不成熟,电子式电压互感器运行中出现了较多的问题,其中准确度问题占主导地位。目前对于影响电子式互感器准确度的因素的分析研究较少,针对这种问题,文中建立了电阻分压型电子式电压互感器的误差模型,分析了互感器与模拟小信号之间的阻抗匹配问题及对误差大小的影响。在此基础上,文章提出了降低互感器误差的措施,对提高电子式电压互感器的准确度具有一定的意义。

Research of the error of electronic voltage transformer based on resistance divider and its influence on electric energy metering

The accuracy of the electronic voltage transformer is the guarantee of safe and stable operation of power system and accurate measurement of power. Because the technology is not yet mature, some problems arise during the operation, among which the accuracy problem is the main problem. Currently, the study on the analysis of the factors which affect the accuracy of electronic instrument transformer is very few. For this reason, the error model of electronic voltage transformer based on resistance divider is created in this paper, and the impedance matching between the transformer and small analog signal power meter is analyzed. On this basis, the measures to reduce the transformer error are proposed, and it has a certain significance to improve the accuracy of electronic voltage transformer.