Inductor devices – Winding formed of plural coils
Patent
1993-04-27
1994-12-06
Picard, Leo P.
Inductor devices
Winding formed of plural coils
336170, H01F 2728
Patent
active
053714857
ABSTRACT:
An improved phase angle regulator with about 70% of the total impedance in the series unit and 30% in the excitor unit. In order to balance the physical size of both units, the excitor unit includes an interleaved winding arrangement. On large phase angle regulators, the higher impedance in the series unit allows for the use of a three-leg core design, and the low impedance interleaved excitor unit can also be designed on a three-leg core. The higher impedance series unit reduces the zero sequence current in the unit by about 40% during a single line to ground fault. Also the interleaved winding arrangement in the excitor unit improves its short circuit withstand capability.
REFERENCES:
patent: 2418643 (1947-04-01), Huge
patent: 4403205 (1983-09-01), Leibinger et al.
patent: 5239288 (1993-08-01), Tsals
ABB Power T&D Company Inc.
Picard Leo P.
Thomas L.
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