Abstract
In 1953, the study committee on restriking voltage was organized by Electric Technology Research Association of Japan.The result of researches made by the committee was reported in 1956 CIGRE. The report pointed out the case of severe restriking voltage which is realized at some occasion of transmission line fault. That phenomenon was not so seriously noticed by the contemporary engineering circle, but a few years later, it was keenly discussed and recognized as “kilometric fault or “short line fault (SLF). Authors carried out intensive studies on the arc dynamics around current zero and had realized demerit of air blast circuit breakers and excellence of SF6 gas circuit breakers in case of SLF. This conclusion led to the development of original gas circuit breakers, and finally to the best and most reliable puffer type GCB, at that time.That was a big step to the age of SF6.
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