Load switch for a step transformer

Details Load switch for a step transformer Load switch for a step transformer

1991-03-27

1992-04-21

Beha, Jr., William H.

Electricity: power supply or regulation systems

External or operator controlled

Using a transformer or inductor as the final control device

200 11TC, 323341, 336150, H01F 2904

Patent

active

051072009

ABSTRACT:
A switching system for a step transformer having at least two adjacent taps and a pair of terminals shiftable between the taps has a pair of fixed contacts normally connected to the terminals, a vacuum interrupter connected between the terminals and displaceable between an open-circuit position and a closed-circuit position, a pair of movable contacts each engageable with a respective one of the fixed contacts and forming therewith a respective bypass switch, and a cam rotatable about a cam axis and having a contact face and an axially oppositely facing interrupter face each formed with a respective operating formation. A drive rotates the cam about its axis through steps of a half revolution. A respective cam follower engaged between each of the movable contacts and the contact-face formation opens and closes one of the bypass switches on rotation of the cam through a half revolution and thereafter opens and closes the other of the bypass switches on rotation of the cam through a succeeding half revolution. Another cam follower and a force storer engaged between the interrupter and the interrupter-face formation snap the interrupter open and then snap it closed each time the cam is rotated through a half revolution.

REFERENCES:
patent: 3421073 (1969-01-01), Perkins
patent: 3622867 (1971-11-01), Topper et al.
patent: 3720867 (1973-03-01), Rathbun
patent: 3813503 (1974-05-01), Breuer

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