Dual voltage distribution transformer with internal varistor sur

Details Dual voltage distribution transformer with internal varistor sur Dual voltage distribution transformer with internal varistor sur

1988-07-06

1989-08-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

361 40, 361111, 361118, H02H 704

Patent

active

048623075

ABSTRACT:
This dual voltage transformer comprises a primary winding having a tap at a location intermediate its length, a first termination for connection to line voltage, and a second termination for connection to ground. When the transformer is to be operated at a relatively high voltage, the first termination is connected through a dual voltage switch to line voltage; and when the transformer is to be operated at a relatively low voltage, the tap is connected through said switch to line voltage. First varistor means is connected across the primary winding between said first and second terminations both when the transformer is operated at high voltage and at low voltage; and second varistor means having a lower breakover voltage than the first varistor means is connected between said tap and ground when the transformer is operated at low voltage.

REFERENCES:
patent: 3211956 (1965-10-01), Dornbush
patent: 3440586 (1969-04-01), Goodman et al.
patent: 3855521 (1974-12-01), Kiuchi
patent: 4604673 (1986-08-01), Schoedube
patent: 4621298 (1986-11-01), McMillen

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