US 4,978,815 AGranted

Load selector for step transformers

AssigneeMaschinenfabrik Reinhausen GmbH

InventorsSiegbert Berger, Karl Kurz, Alfred Mayer

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Abstract

A load selector for switching over from one tap of a step transformer to the next includes fixed step contacts disposed on a circle and connected to taps of a step transformer. At least two switch contacts per phase are disposed in common on a pivotable contact carrier and are simultaneously pivotable on the circle. Two vacuum switches per phase are electrically built into the contact carrier and connected in series with the switch contacts. A cam race is disposed along the circle. Rollers run along the cam race for actuating the vacuum switches. The cam race and the rollers are current free. A slip ring is coaxial with the cam race and the circle. The cam race is disposed axially between and spaced apart from the fixed step contacts and the slip ring. Slip contacts slide on the slip ring. Each of the vacuum switches are eletrically connected between a respective one of the switch contacts and a respective one of the slip contacts.

Claims14

Dependent claims

Load selector for switching over from one tap of a step transformer to the next, comprising:

a switch shaft, a pivotable contact carrier on said switch shaft,
an insulator disposed along a circle, fixed step contacts disposed on said insulator along said circle and connected to taps of a step transformer;
at least two switch contacts per phase being disposed in common on said contact carrier and simultaneously pivotable on said circle;
two vacuum switches per phase electrically built into said contact carrier and connected in series with said switch contacts;
a cam race disposed on said insulator along said circle, rollers being supported by said contact carrier and running along said cam race for actuating said vacuum switches;
a slip ring being supported on said insulator and being coaxial with said cam race and said circle, said cam race being disposed axially between and spaced apart from said fixed step contacts and said slip ring;
and
slip contacts being supported by said contact carrier for sliding on said slip ring, each of said vacuum switches being electrically connected between a respective one of said switch contacts and a respective one of said slip contacts.

5 more elements

Dependencies are inferred from the claim text.