Date of Award

Spring 1970

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Electrical and Computer Engineering

First Advisor

Linehan, J. L.

Abstract

Today ' s fluorocarbon liquids represent an attractive medium for transformer vapor phase cooling . Five basic alternative schemes for incorporating vapor phase cooling into transformer design have been analyzed to determine their technical and economic feasibility. A preliminary cost evaluation revealed that several systems are within a few percent of conventional transformer manufacturing cost while possessing other desirable features, such as : (1) reduced flamability, (2) reduced size and weight, (3) hot spot minimization and (4) greater over- load capability. The most attractive schemes were selected for laboratory evaluation. A series of eight tests were run to validate the technical feasibility of vapor phase cooling of pole type transformers. Two of the schemes tested resulted in significantly lower coil temperatures: a) core/coil totally immersed in Freon 113 and b) a small quantity of Freon 113 with a gravity distribution system. Very good agreement existed between predicted temperature distribution and the actual test data.

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