TY - JOUR N2 - 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. L1 - http://journals.pan.pl/Content/123576/PDF/a05.pdf L2 - http://journals.pan.pl/Content/123576 PY - 2022 IS - No 2 EP - 313 DO - 10.24425/mms.2022.140035 KW - voltage transformer KW - traceability method KW - calibration KW - high voltage A1 - Liu, Hao A1 - Chen, Lixue A1 - Wang, Xue A1 - Yao, Teng A1 - Gu, Xiong PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation VL - vol. 29 DA - 2022.06.29 T1 - An improved algorithm for the series step-up method based on a linear three-ports network SP - 301 UR - http://journals.pan.pl/dlibra/publication/edition/123576 T2 - Metrology and Measurement Systems ER -