Title :
Co-ordination of Dry-Type Transformer Models with Transformer Geometry [includes discussion]
Author_Institution :
MEMBER AIEE, General Electric Company, Pittsfield, Mass.
Abstract :
The present practice of using different temperature classes of insulation in a single unit as indicated feasible by functional test codes1 and evaluation of component insulations2 make the knowledge of temperature gradients throughout the dry-type transformer of prime importance. A number of thermal effects of presently used dry-type transformer geometries are evaluated and data presented showing their interrelation. Some representative ratios of hot-spot temperature rises are given allowing a closer co-ordination between a dry-type transformer aging model and its prototype. Since winding height is a major factor, some corrections factoring this item with the general ratios are proposed.
Keywords :
Aging; Coils; Ducts; Geometry; Insulation testing; Power transformer insulation; Prototypes; Solid modeling; Temperature; Voltage;
Journal_Title :
Power Apparatus and Systems, Part III. Transactions of the American Institute of Electrical Engineers
DOI :
10.1109/AIEEPAS.1956.4499309