Study on the ratio change measurement of 1000 kV HVDC divider based on improved DC voltage summation method

作     者：Dengyun Li Kaipei Liu Min Lei Feng Zhou Changxi Yue Jicheng Yu 

作者机构：School of Electrical EngineeringWuhan UniversitySchool of Electrical EngineeringWuhan 430072People's Republic of China China Electric Power Research InstituteWuhan 430074People's Republic of China 

出 版 物：《High Voltage》 (高电压（英文）)

年 卷 期：2020年第5卷第2期

页      面：202-208页

核心收录：

学科分类：0808[工学-电气工程] 080803[工学-高电压与绝缘技术] 08[工学] 

基　　金：the National Key Research and Development Programme(2017YFB0903705) 

主　　题：divider ratio method 

摘      要：Determining the voltage ratio change is one of the core issues in the traceability of the DC voltage *** on the previous research results,this study proposes an improved DC voltage summation method to evaluate the voltage division ratio error of 1000 kV DC resistance *** principle of the method is to calibrate the voltage divider with rated voltage 2U by using two auxiliary voltage dividers which are with rated voltage U,wherein the high-voltage(HV)arm and the low-voltage arm of the auxiliary voltage divider can be *** results show that compared with the conventional method,the method can reduce one measurement variable when determining the divider s ratio change,thus simplifying the calibration *** voltage ratio of 100 kV measured by the method of this study was well-verified by the calibration results from the National Institute of Metrology(NIM,China)and Physikalisch-Technische Bundesanstalt(PTB,Germany).Using the proposed method,the ratio change of DC voltage divider at an applied voltage of 1000 kV was effectively obtained and the uncertainty of 2.5μV/V was *** results can provide technical guarantee for the accurate measurement of HVDC magnitude.