Load switch for a step transformer

US5107200A · kind A · utility

Assignee

• MASCHINENFABRIK REINHAUSEN GMBH · DE

Inventors

• Dieter Dohnal · Lappersdorf, DE
• Josef Neumeyer · Waldetzenberg, DE

Key dates

• Filing date: Mar 27, 1991
• Grant date: Apr 21, 1992
• Expiry date: Mar 27, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01H9/38
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

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 i…