By Topic  Dielectric recovery of copper chromium vacuum
interrupter contacts after short-circuit interruption  Sign In
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subscriptions  3 Author(s)  The recovery of a vacuum interrupter
gap after short-circuit interruption was measured by application
of an overshooting transient recovery voltage (TRV) several tens
of microseconds after current zero. Copper chromium contact
materials were employed varying in composition (25 and 50%
chromium content), gas content, and production method. The gap
failure was either pure dielectric or it was dominated by a
significant postarc current. Therefore, postarc current
phenomena were experimentally investigated focused on the
relationship among the postarc current, the power frequency
current amplitude, and the gap length. It was found that two
postarc current maxima exist: the first strongl