Adaptive transformer thermal overload protection

Author

Swift, G.W. ; Zocholl, S.E. ; Bajpai, M. ; Burger, J.F. ; Castro, C.H. ; Chano, S.R. ; Cobelo, F. ; De Sá, P. ; Fennell, E.C. ; Gilbert, J.G. ; Grier, S.E. ; Haas, R.W. ; Hartmann, W.G. ; Hedding, R.A. ; Kerrigan, P. ; Mazumdar, S. ; Miller, D.H. ; Mysore

Volume

16

Issue

4

fYear

2001

fDate

10/1/2001 12:00:00 AM

Firstpage

516

Lastpage

521

Abstract

This paper is based on a report of the same title, prepared by Working Group K3 of the Substation Protection Subcommittee of the Power System Relaying Committee of the Power Engineering Society of the IEEE. The paper begins with background information on the causes, measurement techniques, and consequences of overheating in mineral-oil-immersed power transformers. Then techniques for adaptive transformer thermal overload protection based on the real-time solution of the transient heating equations are presented. An adaptive overcurrent protection implementation, and the related functional requirements, are discussed. The equations of Clause 7 of the 1995 IEEE Guide for Loading Mineral-Oil-Immersed Transformers are used in the analysis, with a slight modification to allow for continuously varying ambient temperature

Keywords

overcurrent protection; power transformer insulation; power transformer protection; thermal analysis; transformer oil; IEEE Guide; IEEE Substation Protection Subcommittee; adaptive overcurrent protection; adaptive transformer thermal overload protection; measurement techniques; mineral-oil-immersed power transformers; overheating; thermal overload protection; transient heating equations; Equations; Heating; Measurement techniques; Power & Energy Society; Power system protection; Power system relaying; Power system transients; Power transformers; Substation protection; Temperature;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.956730

Filename

956730