Research for electric energy systems -- an annual report

Abstract

v1.

Comparative high voltage impulse measurement

“…(3), ${\mathrm{normal\delta }}_{\mathrm{normalr}}^2(V)$, is associated with the voltage measurement. Through the use of a special technique known as the pulse level line (PLL) method, conventional analog storage oscilloscopes which generally have specified relative uncertainties of the order of 1 % can have relative standard uncertainties in the measured output voltage peak reduced to less than 0.1 % [11]. Variations of a basic method called the “slideback” measurement technique, which uses a voltage reference or references, are used to ensure or improve the accuracy of a peak impulse voltage measurement.…”

“…6, the relative difference in the fringe numbers calculated from the two waveforms is less than 0.02 %. The operating conditions of the photodetectors have been optimized to have nonlinearities of less than 0.1 % [11]. …”

“…To estimate these uncertainties the general relationship between the measured peak output voltage V p and the reference voltage levels for the PLL technique are used [11]: $V_{\mathrm{normalp}}=V_1+\left(V_2-V_1\right)\left(h_{\mathrm{normalp}}-h_1\right)/\left(h_2-h_1\right),$where h p is the measured height of V p , h 1 is the measured height of pulse level line 1, h 2 is the measured height of pulse level line 2, V 1 is reference voltage 1, and V 2 is reference voltage 2. The standard uncertainty δ( V p ) is found by applying the law of propagation of uncertainty to Eq.…”