@ARTICLE{Liu_Hao_An_2022,
 author={Liu, Hao and Chen, Lixue and Wang, Xue and Yao, Teng and Gu, Xiong},
 volume={vol. 29},
 number={No 2},
 journal={Metrology and Measurement Systems},
 pages={301-313},
 howpublished={online},
 year={2022},
 publisher={Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation},
 abstract={Capacitive leakage and adjacent interference are the main influence sources of the measuring error in the traditional series step-up method. To solve the two problems, a new algorithm was proposed in this study based on a three-ports network. Considering the two influences, it has been proved that response of this three-ports network still has characteristics of linear superposition with this new algorithm. In this threeport network, the auxiliary series voltage transformers use a two-stage structure that can further decrease measurement uncertainty. The measurement uncertainty of this proposed method at 500/√3 kV is 6.8 ppm for ratio error and 7 μrad for phase displacement ( k = 2). This new method has also been verified by comparing its results with measurement results of the PTB in Germany over the same 110/√3 kV standard voltage transformer. According to test results, the error between the two methods was less than 2.7 ppm for ratio error and 2.9 μrad for phase displacement.},
 type={Article},
 title={An improved algorithm for the series step-up method based on a linear three-ports network},
 URL={http://www.czasopisma.pan.pl/Content/123576/PDF/a05.pdf},
 doi={10.24425/mms.2022.140035},
 keywords={voltage transformer, traceability method, calibration, high voltage},
}