Improvements in the accuracy of determining standard voltage transformer errors by the utilization of specially developed amplifiers are described. Results of recently evaluated measurements in the fundamental parallel-series step-up method of the Physikalisch-Technische Bundesanstalt (PTB) are reported. The overall limit of uncertainty in the calibration of high voltage ratios has been improved by a factor of ten as compared with previous results at power frequencies.
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Braun et al. (1980) studied this question.
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