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Title: Flow directing means for air-cooled transformers

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.

Inventors:
 [1]
  1. Oak Ridge, TN
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
862877
Patent Number(s):
4032873
Assignee:
United States of America as represented by United States Energy (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
flow; directing; means; air-cooled; transformers; relates; improvements; systems; force-cooling; outer; helical; winding; insulation; barrier; nested; therein; form; axially; extending; annular; passage; cooling-fluid; tubular; shroud; positioned; define; chamber; width; range; 25; times; baffles; extend; inward; channels; hydraulic; diameters; inlet; designed; diameter; approximating; coolant-entrance; above-mentioned; modified; described; operated; significantly; load; levels; exceeding; safe; operating; temperatures; instances; permits; continuous; operation; 200; nameplate; rating; annular passage; annular chamber; continuous operation; flow channels; flow channel; fluid flow; operating temperature; operating temperatures; annular flow; axially extending; tubular shroud; directing means; helical winding; therein form; insulation barrier; /336/

Citation Formats

Jallouk, Philip A. Flow directing means for air-cooled transformers. United States: N. p., 1977. Web.
Jallouk, Philip A. Flow directing means for air-cooled transformers. United States.
Jallouk, Philip A. Sat . "Flow directing means for air-cooled transformers". United States. https://www.osti.gov/servlets/purl/862877.
@article{osti_862877,
title = {Flow directing means for air-cooled transformers},
author = {Jallouk, Philip A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1977},
month = {1}
}

Patent:

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