Electricity: power supply or regulation systems – Remote sensing
Patent
1976-07-06
1977-05-10
Goldberg, Gerald
Electricity: power supply or regulation systems
Remote sensing
323 435R, 323 48, 323 83, 323 91, 336147, 336148, H01F 2902
Patent
active
040230902
ABSTRACT:
In an electrical three phase variable power supply fed by three phase alternating power and having a three coil adjustable autotransformer connected in wye across the power lines, the autotransformer having taps associated with each of its coils for adjustably connecting to different turns thereof, the power supply having at least one neutral joining the coils of the autotransformer, Zagreb circuit method of varying the power output of the power supply, the Zagreb circuit method comprising providing a supply transformer having a three coil primary, corresponding ends of said primary coils connected to the taps, respectively, and arranging the primary coils in relation to the autotransformer alternatively as follows:
A. connecting them in delta across the power lines for a high value of output power;
B. connecting them in wye across said power lines in parallel with the autotransformer for a low value of output power; and
C. connecting the opposite ends of the primary coils to the power lines, respectively, while adjusting the respective positions of the taps for a range of variable output power between the high and low values.
REFERENCES:
patent: 2560385 (1951-07-01), Dessarzin
patent: 3014173 (1961-12-01), Martin et al.
patent: 3374426 (1968-03-01), Bedil
patent: 3652925 (1972-03-01), Yamana
patent: 3690739 (1972-09-01), Prescott
patent: 3978395 (1976-08-01), Legnaioli
Fisher William L.
Goldberg Gerald
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