Research on Digital Output Verification Technology of Electronic DC Current Transformer

2017 2nd Asia Conference on Power and Electrical Engineering

能源学;电工学

Chen, Yuanjie^1 ; Wang, Bin^1 ; Hu, Haoliang^2 ; Xiong, Qianzhu^2 ; Yang, Chunyan^2

College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan

430081, China^1

China Electric Power Research Institute, Wuhan

430074, China^2

关键词: Calibration system;    Converter station;    Digital calibrations;    Digital synchronizations;    Field calibration;    Protocol conversion;    Synchronous clocks;    Virtual instrument;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/199/1/012077/pdf
DOI  :  10.1088/1757-899X/199/1/012077

来源: IOP

【 摘 要 】

Aiming at the error of calibration system when conducting field calibration by electronic DC current transformer's digital calibration system, an electronic DC current transformer's digital calibration system based on protocol conversion is proposed and researched. Data frames outputted from merging unit are collected and converted by the system, the digital synchronization is realized by using the synchronous clock device to trigger the second pulse, and it is verified by the virtual instrument design software. The field calibration is conducted to some converter station digital dc current transformer under the rated current of 500A by using the calibration system. By calibrating and analyzing errors, the error is less than 0.075% when tested current is more than 40% of the rated current. According the standard in literature[1], performance of the calibration system is perfect, measured results perfectly meet the requirements of design, and the calibration system has great practical application value.