雷インパルス高電圧標準計測システムの不確かさ評価への直角波応答特性の適用

概要

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In evaluating the uncertainty of the standard measuring system for lightning-impulse high voltage, which is composed of the standard voltage divider, the digital recorder and the calibrators, step-response tests of the standard voltage divider may be useful. In this paper, convolution algorithm is employed to calculate output impulse-voltage waveforms from measured step-response waveforms. The uncertainties of the peak-value measurement due to influence of a nominal epoch, uncertainty of the peak-value measurement due to dispersion of the AC scale factor, and uncertainty of the virtual front-time measurement due to long-term stability are evaluated. Furthermore, error of the virtual front time of output waveforms is discussed. The front part of the step-response waveform, t<T30%, does not influences the error of the virtual front time. Therefore, for the standard voltage divider, step-response parameters, i.e. experimental response time, partial response time, settling time, and overshoot have almost nothing to do with the error of the virtual front time.