Positioning control means for motor driven rotary tap changer

Details Positioning control means for motor driven rotary tap changer Positioning control means for motor driven rotary tap changer

1975-09-08

1978-03-14

Schaefer, Robert K.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318265, 318467, G05B 1114

Patent

active

040792994

ABSTRACT:
A rotary tap changer or switch is rotated by a motor to a plurality of contactor positions by a control system having a cam that rotates to activate limit switches respectively corresponding to contactor positions. The activation of the limit switches causes operation of a relay which, after a selected time delay, operates to discharge a capacitor across the motor to apply dynamic braking and stop the motor. When starting the motor to rotate the tap changer, energization is applied through the limit switches to select rotation in a forward or reverse direction determined with some modification by the shortest distance of rotation to the new selected position.

REFERENCES:
patent: 2669680 (1954-02-01), Wrenn
patent: 2869061 (1959-01-01), Pinney
patent: 3617837 (1971-11-01), Beck
patent: 3914676 (1975-10-01), Madonian et al.
patent: 3965404 (1976-06-01), Petersen

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