NDLI: Oil-Forced Versus Oil-Directed Cooling of Power Transformers

Content Provider	IEEE Xplore Digital Library
Author	Sorgic, M. Radakovic, Z.
Copyright Year	1986
Abstract	In this study, an analysis of the oil-forced (OF) and oil-directed (OD) cooling of oil power transformers was performed. The starting point was a case study of an OF transformer with a declared rated power of 360 MVA having thermal problems in operation. The effects of possible improvements of the cooling were analyzed, where the limiting factor was the geometry of the transformer (winding, core, and tank); cross sections and cooling channels of the windings and the core were also resolved. All calculations, showing an influence of varying characteristics of the cooling (the pump, the cooler, modification from OF to OD construction), were realized with software based on a detailed thermal-hydraulic model. This method gives all relevant oil flows (including oil bypass between the winding and the tank) and all temperatures for a specified configuration and specified parameters of the cooling system. Based on the results, the limits of OF cooling in general are clearly described in this paper. Finally, the effect of applying oil guiding elements inside the windings is illustrated and discussed.
Sponsorship	IEEE Power Engineering Society
Starting Page	2590
Ending Page	2598
Page Count	9
File Size	732703
File Format	PDF
ISSN	08858977
Volume Number	25
Issue Number	4
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Windings Cooling Oil insulation Temperature Power transformer insulation transformer Hot-spot temperature oil bypass oil-directed (OD) cooling oil-forced (OF) cooling thermal design
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology Electrical and Electronic Engineering

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Ratings of Oil Power Transformer in Different Cooling Modes

Decomposition of the Hot-Spot Factor

Basics of Detailed Thermal-Hydraulic Model for Thermal Design of Oil Power Transformers

Dynamic thermal modelling of power transformers

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Dynamic thermal modeling of power transformers: further Development-part I

Estimation of the hottest spot temperature (HST) in power transformers considering thermal inhomogeniety of the windings

Dynamic thermal modeling of power transformers: further Development-part II

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