Distribution transformers

Details Distribution transformers Distribution transformers

1994-10-12

1995-10-03

Picard, Leo P.

Inductor devices

Three or more windings

336225, 336 5, 336213, H01F 2725

Patent

active

054555531

ABSTRACT:
A distribution transformer has a wound magnetic core (50) of overall circular shape and rectangular cross-section with between two and four overall rectangular shape electric coils (20,30) extending through the core window. The coils (20,30) are pre-formed and assembled so that their parts (20A,30A) which meet form a circular section solid cylinder. A mandrel (40) is then located around this cylinder (20A,30A) and continuous non-amorphous steel strip is wound thereon to form an unannealed, uncut wound magnetic core of axial length in the range 250 mm to 1 m. In a modification, amorphous steel strip is first wound on to another mandrel, annealed, and then transferred from the other mandrel on to the mandrel around the coils.

REFERENCES:
patent: 2314912 (1943-03-01), Troy
patent: 2359173 (1944-09-01), Troy
patent: 3128443 (1964-04-01), Herman et al.
patent: 3395373 (1968-07-01), Stephens
patent: 4646048 (1987-02-01), Hunt et al.
patent: 4651412 (1987-03-01), Beisser
patent: 4906960 (1990-03-01), Alexandrov
patent: 5168255 (1992-12-01), Poulson
patent: 5202664 (1993-04-01), Poulson

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