Effect of test voltage function on a front-time of lightning impulse voltage measured by a long measuring cable

Summary

The test voltage function or k-factor was newly introduced in IEC 60060-1:2010. With the k-factor combined with base curve technique, lightning impulse parameters have been evaluated much easily and stably than with the old method defined in IEC 60060- 1:1989. Now there has been a report in IEC TC 42 committee that front time evaluated from recorded curve of a smooth waveform at the end of a long measuring cable becomes much larger by IEC 60060-1:2010 definition than with IEC 60060-1:1989 description. Authors could not only confirm this phenomenon and find reasons to cause but also propose a technique to circumvent this difficulty. In the paper, details of the counter measure and arrangement of the measuring system, which eliminates erroneous front time evaluation, are introduced.

Additional informations

Authors

S. NISHIMURA, H. SHIMIZU

Keywords

IEC 60060-1 2010, test voltage function, measuring cable, base curve, lightning impulse voltage