LOAD TAP CHANGER

摘要

A tap changing system (10') for operation with a transformer (T) and featuring a special group of gate controlled electronic devices (X) that operate as a circuit breaker and recloser such that, after half cycle of short-circuit current, said special group (X) is transferred to the OFF-state, whereby the tap changer (10') winding is open circuited; the advantage being that only the special group of devices (X) 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.