Thermal Overshoot Analysis for Hot-spot Temperature Rise of Transformer

Author

Zhou, L.J. ; Wu, G.N. ; Yu, J.F. ; Zhang, X.H.

Author_Institution

Southwest Jiaotong Univ., Chengdu

Volume

14

Issue

5

fYear

2007

fDate

10/1/2007 12:00:00 AM

Firstpage

1316

Lastpage

1322

Abstract

The objective of this paper is to introduce a general model of hot-spot temperature rise calculation for the non-directed flow windings in order to explain the thermal overshoot phenomenon. The model employs heat transfer principles and hydrodynamics, in which the duct oil flow velocity is taken into account, and is validated using experimental results obtained for step changing load current on a oil natural-air natural (ONAN) cooling mode, 40 MVA transformer. The thermal overshoot phenomenon is analyzed by simulation for a 20-MVA-ONAN-cooled unit and a 40-MVA-ONAN-cooled unit.

Keywords

cooling; hydrodynamics; power transformers; duct oil flow velocity; heat transfer principles; hot-spot temperature rise; hydrodynamics; nondirected flow windings; oil natural-air natural cooling mode; power transformer; thermal overshoot analysis; Ducts; Heat transfer; Hydrodynamics; Oil insulation; Petroleum; Power transformer insulation; Power transformers; Temperature; Thermal engineering; Thermal loading;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2007.4339495

Filename

4339495