摘要
电极位移法是一种关注内电极位移量的高压标准电容器电压系数测量方法。该方法认为内电极顶面在水平方向上的位移量与电容量存在函数关系,却未考虑引起内电极形变的作用力类型。由于不同作用力下内电极挠度分布并不相同,故不同力产生相同的内电极顶面位移量时,实际电容量却存在差异,这就有可能影响电压系数测量的准确度。为研究这种差异,文章对一台悬臂梁式400 kV高压标准电容器进行了仿真和实验。结果表明,在20 kV~350 kV电压变化范围内,电容器内电极顶面最大位移量为52μm,电压系数最大为13.8×10^(-6)。其中,不同力作用下,内电极挠度分布存在差异,但导致的电压系数不确定度仅为0.098×10^(-6)。因此在考虑高压标准电容器的电压系数最大允许误差为10-6量级时,内电极形变差异对电压系数测量实验的影响可以忽略,从而验证了电极位移法的可靠性。
Electrode displacement method is a voltage coefficient measurement method of high voltage standard capacitor concerning internal electrode displacement.This methods assumes that the displacement and capacitance on top of electrode along the horizontal direction exist function relation,but the type of action force causing the deformation of the internal electrode is not considered.Since the deflection distri-bution of internal electrode is different under different action forces,the actual capacitance is different when the same internal electrode top surface displacement is generated by different forces,which may affect the accuracy of voltage coefficient measurement.For studying this difference,a set of cantilever beam type 400 kV high voltage standard capacitor is simulated and tested.The results show that the maximum displacement on top surface of the capacitor is 52μm and the maximum voltage coefficient is 13.8×10^(-6) when the voltage varies from 20 kV to 350 kV.Under the action of different forces,the deflection distribution of the internal electrode is different,but the resulting voltage coefficient uncertainty is only 0.098×10^(-6).Therefore,in case of considering the maximum allowable error of voltage coefficient of high voltage standard capacitor at 10-6 magnitude,the influence of internal electrode deformation difference on voltage coeffi-cient measurement experiment can be ignored,thus verifying reliability of electrode displacement method.
作者
黄河
王家福
许素安
张煌辉
李国宾
HUANG He;WANG Jiafu;XU Suan;ZHANG Huanghui;LI Guobin(College of Mechanical and Electrical Engineering,China Jiliang University,Hangzhou 310018,China;National institute of Metrology,Beijing 100029,China;Fujian Metrology Institute,Fuzhou 350001,China;Shandong Taikai Testing Co.,Ltd.,Shangdong Taian 271000,China)
出处
《电力电容器与无功补偿》
2024年第3期57-62,共6页
Power Capacitor & Reactive Power Compensation
基金
云南省科技揭榜制项目(YNKJXM20210075)
中国南方电网公司重点项目(202104BN050011)。
关键词
高电压计量
高压标准电容器
电压系数
电极位移法
不确定度
high voltage measurement
high voltage standard capacitor
voltage coefficient
electrode displacement method
uncertainty
