Electrical changeover switching
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United States of America Patent
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-
Feb 18, 1997
Grant Date -
N/A
app pub date -
May 4, 1994
filing date -
Sep 21, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A changeover switch for a tap changer including a pair of load switches. A diverter switch allows load to be diverted along a second path when its associated main switch is opened or closed. An auxiliary circuit has an auxiliary switch and a varistor connected in parallel across the secondary of a transformer. When the auxiliary switch is opened the varistor impedance is reflected onto the primary of the transformer which causes the current in the main switch to divert through the diverter switch so that the main switch can be opened or closed with substantially no load on it.
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