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 

机构地区：[1]School of Electrical Engineering,Wuhan University,School of Electrical Engineering,Wuhan 430072,People's Republic of China [2]China Electric Power Research Institute,Wuhan 430074,People's Republic of China

出　　处：《High Voltage》2020年第2期202-208,共7页高电压（英文）

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

摘　　要：Determining the voltage ratio change is one of the core issues in the traceability of the DC voltage divider.Basing 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 divider.The 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 separated.Research 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 process.The 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 achieved.Research results can provide technical guarantee for the accurate measurement of HVDC magnitude.

关 键 词：DIVIDER RATIO METHOD 

分 类 号：TM86[电气工程—高电压与绝缘技术]