An investigation of the temperature distribution in cast-resin transformer windings

Author

Pierce, Linden W.

Author_Institution

General Electric Co., Rome, GA, USA

Volume

7

Issue

2

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

920

Lastpage

926

Abstract

A comprehensive thermal test program was conducted on a 2000 kVA cast-resin dry type transformer with 300 embedded thermocouples to determine the hottest spot temperature allowance and to obtain data to develop mathematical models. Nineteen thermal test runs were performed at different loads, tap positions, and core excitations under natural and forced air operating conditions. The test data indicated that the hottest spot temperature allowance used in the IEC standard was too low. In the IEEE standard, the hottest spot temperature allowance appears conservative up to about 115°C average winding temperature rise. The locations of the hottest spot for the primary and secondary winding were determined. Conclusions about thermal testing and loading are presented

Keywords

power transformers; standards; temperature measurement; thermocouples; transformer testing; transformer windings; 2000 kVA; IEC standard; IEEE standard; cast-resin transformer windings; core excitations; embedded thermocouples; forced air operating conditions; spot temperature; temperature distribution; thermal loading; thermal testing; Dielectrics and electrical insulation; Europe; IEC standards; Power transformer insulation; Solids; Standards development; Temperature distribution; Testing; Thermal loading; Windings;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.127099

Filename

127099