Flow directing means for air-cooled transformers

Details Flow directing means for air-cooled transformers Flow directing means for air-cooled transformers

1976-05-21

1977-06-28

Kozma, Thomas J.

Inductor devices

With temperature modifier

With inductor insulating fluid circulating means

336 59, 336 60, H01F 2708

Patent

active

040328732

ABSTRACT:
This invention relates to improvements in systems for force-cooling transformers of the kind in which an outer helical winding and an insulation barrier nested therein form an axially extending annular passage for cooling-fluid flow. In one form of the invention a tubular shroud is positioned about the helical winding to define an axially extending annular chamber for cooling-fluid flow. The chamber has a width in the range of from about 4 to 25 times that of the axially extending passage. Two baffles extend inward from the shroud to define with the helical winding two annular flow channels having hydraulic diameters smaller than that of the chamber. The inlet to the chamber is designed with a hydraulic diameter approximating that of the coolant-entrance end of the above-mentioned annular passage. As so modified, transformers of the kind described can be operated at significantly higher load levels without exceeding safe operating temperatures. In some instances the invention permits continuous operation at 200% of the nameplate rating.

REFERENCES:
patent: 2388566 (1945-11-01), Paluev
patent: 2459322 (1949-01-01), Johnston
patent: 2632041 (1953-03-01), Bilodeau
patent: 2751562 (1956-06-01), Camilli et al.
patent: 2942213 (1960-06-01), Camilli et al.
patent: 3548354 (1970-12-01), Schwab
patent: 3902146 (1975-08-01), Muralidharan

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