摘要
文中基于电阻式电压互感器的工作原理,分析了其在开关柜的工作环境下测量误差的来源。利用Ansys有限元分析软件建立了电子式电压互感器(electrical voltage transformer,EVT)三维模型,基于电场结果,分别分析了杂散电容、母排、邻近相和开关柜柜体对EVT准确度的影响程度,加入EVT屏蔽结构进行仿真;最后结合实体试验,对误差分析结果进行验证。结果表明加上该屏蔽结构的电子式电压互感器准确度达到0.2级,且所得结论对其在开关柜中的实际应用有一定的指导意义。
This paper analyzes the source of electrical voltage transformer(EVT)measurement error in the switchgears,based on the working principle of resistive voltage transformers.EVT model is established by Ansys finite element analysis software.According to those electric field results,the influence of the stray capacitance,bur bars,adjacent phases and switchgears on the EVT accuracy are analyzed,and an EVT shield is designed and simulated.Finally,the error analysis results are validated by the entity test.Solutions are meaningful for EVT shield structure designing and practical application in switchgears.
作者
张茜
肖霞
徐雁
刘琦
胡浩亮
徐子立
ZHANG Qian;XIAO Xia;XU Yan;LIU Qi;HU Haoliang;XU Zili(State Key Laboratory of Electromagnetic Engineering of Electrical and Electronic Engineering School,Huazhong University of Science and Technology,Wuhan 430074,China;China Electric Power Research Institute Wuhan Branch,Wuhan 430074,China)
出处
《高压电器》
CAS
CSCD
北大核心
2019年第6期177-183,共7页
High Voltage Apparatus
基金
国家电网公司科技项目(JE71-15-040)~~
关键词
电阻分压
电子式电压互感器
开关柜
电场
屏蔽
resistor divider
electronic voltage transformer
switchgear
electric field
shield
