Bilateral comparison of voltage transformer measuring systems of NCHVM and PTB

Xue Wang, Enrico Mohns, Chun Yang Jang, Peter Raether, Hong Yang

Abstract

An intercomparison of voltage transformer calibration systems was performed between National Center For High Voltage Measurement (NCHVM) and Physikalisch-Technische Bundesanstalt (PTB) in order to confirm their measurement capabilities. Two voltage transformers were used as travelling standards with transformer ratios of 10 kV / 100 V and (110 kV / √3) / 100 V at a frequency of 50 Hz and at ambient temperatures of 23 °C ± 3 °C. The measurements has been performed at test points varying from 20% to 120% of the rated voltage. For the ratio of 10 kV / 100 V the test results differ by no more than 4 parts in 10⁶ for the voltage ratio and 4 µrad for the phase displacement. For the ratio of (110 kV / √3) / 100 V the results agree within 2 parts in 10⁶ for the voltage ratio and 9 µrad for the phase displacement.

Keywords

voltage transformers, travelling standard, bilateral comparison, uncertainty

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DOI

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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