Abstract :
In 1983 IEC Technical Committee 42 requested that CIGRE should prepare the technical basis for the draft of a revised standard to be prepared by IEC Working Group 42-08. An experimental study based on simultaneous measurements with two impulse measuring systems was proposed by WG 33-03. Fourteen laboratories participated in the work and comparative measurements were made using 95 systems based on 53 dividers. The results of this study showed that for 44% of these measurements at least one of the two systems was outside the criteria set for good measurements. Because no transfer measurments were made between laboratories there was no way to detect similar errors in both the system under test and the reference system. Hence the conclusions might be worse than indicated here. The results of the CIGRE study, confirmed subsequently by other programmes of intercomparison measurements using transfer systems, led to the recommendation that comparative measurments should be the preferred method for qualifying industrial measuring systems in the revised international standards
