Tap changing system having discrete cycle modulation and fault rotation for coupling to an inductive device
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United States of America Patent
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Feb 18, 1997
Issued Date -
N/A
app pub date -
Apr 6, 1995
filing date -
Oct 26, 1992
priority date (Note) -
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Abstract
A tap changing system for operation with a transformer and featuring a special group of gate-controlled electronic devices that operate as a circuit breaker and recloser such that, after half-cycle of short-circuit current, said special group is transferred to the OFF-state, whereby the tap changer winding is open circuited; the advantage being that only the special group of devices need be rated to sustain short-circuit conditions; a further feature is the concept of Discrete-Cycle Modulation (DCM) whereby tap voltage magnitudes are obtainable in increments intermediate the physical tap winding voltage magnitudes.
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