Load switch for a step transformer

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

H - Electricity

01

H

306/300

H01H 3/42 (2006.01) H01F 29/04 (2006.01) H01H 9/00 (2006.01) H01H 3/60 (2006.01) H01H 9/38 (2006.01)

Patent

CA 2039819

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 interrupt- er open and then snap it closed each time the cam is rotated through a half revolution.

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