Tap changing system having discrete cycle modulation and fault r

Details Tap changing system having discrete cycle modulation and fault r Tap changing system having discrete cycle modulation and fault r

1995-04-06

1997-02-18

Sterrett, Jeffrey L.

Electricity: power supply or regulation systems

Output level responsive

Using a transformer or inductor as the final control device

323343, G05F 116

Patent

active

056044232

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.

REFERENCES:
patent: 3195038 (1965-07-01), Fry
patent: 3319153 (1967-05-01), Livingston
patent: 3461378 (1969-08-01), King
patent: 3600664 (1971-08-01), Goldberg et al.
patent: 3684949 (1972-08-01), Yamachi et al.
patent: 3700925 (1972-10-01), Wood
patent: 3786337 (1974-01-01), Kugler
patent: 3909697 (1975-09-01), Depenbrock
patent: 4135126 (1979-01-01), Rubashev et al.
patent: 4220911 (1980-09-01), Rosa
patent: 5408171 (1995-04-01), Eitzmann et al.

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