Load selector for step transformers

Details Load selector for step transformers Load selector for step transformers

1989-09-29

1990-12-18

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Pivoted contact

200144B, H01H 1954, H01H 3366

Patent

active

049788159

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.

REFERENCES:
patent: 3467800 (1969-09-01), Barr
patent: 3739111 (1973-06-01), Wittenzellner et al.
patent: 4546222 (1985-10-01), Watanabe et al.

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