An improved algorithm for the series step-up method based on a linear three-ports network

Authors

  • Hao Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road Hongshan District, Wuhan, China
  • Lixue Chen State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, No. 1037 Luoyu Road Hongshan District, Wuhan, China
  • Xue Wang China Electric Power Research Institute, Wuhan, China
  • Teng Yao China Electric Power Research Institute, Wuhan, China
  • Xiong Gu China Electric Power Research Institute, Wuhan, China

DOI:

https://doi.org/10.24425/mms.2022.140035

Keywords

voltage transformer, traceability method, calibration, high voltage

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.

References

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Published

2022-06-30

How to Cite

Liu, Hao, et al. “An Improved Algorithm for the Series Step-up Method Based on a Linear Three-Ports Network”. Metrology and Measurement Systems, vol. 29, no. 2, June 2022, pp. 301-13, doi:10.24425/mms.2022.140035.

Issue

Vol. 29 No. 2 (2022)

Section

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