Flow directing means for air-cooled transformers

Patent · 31 December 1976

OSTI ID:862877

Jallouk, Philip A ^[1]

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1. Oak Ridge, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States Energy (Washington, DC)
• Patent Number(s): US 4032873
• OSTI ID: 862877
• Country of Publication: United States
• Language: English

Related Subjects

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200
25
above-mentioned
air-cooled
annular
annular chamber
annular flow
annular passage
approximating
axially
axially extending
baffles
barrier
chamber
channels
continuous
continuous operation
coolant-entrance
cooling-fluid
define
described
designed
diameter
diameters
directing
directing means
exceeding
extend
extending
flow
flow channel
flow channels
fluid flow
force-cooling
form
helical
helical winding
hydraulic
improvements
inlet
instances
insulation
insulation barrier
inward
levels
load
means
modified
nameplate
nested
operated
operating
operating temperature
operating temperatures
operation
outer
passage
permits
positioned
range
rating
relates
safe
shroud
significantly
systems
temperatures
therein
therein form
times
transformers
tubular
tubular shroud
width
winding