Abstract
This paper summarizes the comparison measurements carried out by the authors with the two PTB dividers, A and B, that have been used in International Comparisons at many laboratories in the world, and with a 2m, 10k Ω resistor divider. For full lightning impulse, the difference of peak values measured by the two dividers was less than 0.2% in all cases. The peak value difference increases with a decrease of the time to chopping. In order to evaluate those results, simulations of those comparison measurements were carried out by using a convolution algorithm with measured unit step responses of the measuring systems mentioned above and input impulse waveforms calculated by using EMTP. As a result, the simulated values agree well with the measured ones. Furthermore, similar simulations for several input waveforms were carried out. The simulated results of comparison measurements were influenced by the input waveforms; nevertheless, those waveforms were used to approximate the chopped lightning impulse on previous works.
