LTC compensating winding for parallel operation of transformers

Details LTC compensating winding for parallel operation of transformers LTC compensating winding for parallel operation of transformers

1993-04-27

1994-11-29

Picard, Leo P.

Inductor devices

With means to change coil length or connections

Plural coils

336150, 336170, H01F 2100

Patent

active

053693884

ABSTRACT:
A winding configuration for a transformer equipped with a load tap changer which maintains an impedance balance when the transformer is connected in parallel with another transformer in the field. The winding configuration, from the core outward, consists of a first compensating winding, a low voltage (LV) winding, a load tap changer (LTC) winding, a high voltage (HV) winding, and a second compensating winding. If the impedance of the transformer has to be lowered to match the impedance of the existing unit in the field, the second compensating winding is coupled in series with the LV winding. If the impedance of the transformer has to be increased to match the impedance of the existing unit in the field, the first compensating winding is coupled in series with the LV winding.

REFERENCES:
patent: 3452311 (1969-06-01), Beck et al.
patent: 3611224 (1971-08-01), Becker
patent: 3611228 (1971-08-01), Walling
patent: 3621428 (1971-11-01), Johnson
patent: 3691495 (1972-09-01), Conway
patent: 4255734 (1981-03-01), Owen

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