Real-time thermal model for an oil-immersed forced-air cooled transformer

Journal Article · Sat Mar 31 23:00:00 EST 1990 · IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/61.53112· OSTI ID:6718983

Alegi, G L ^[1]; Black, W Z ^[2]

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1. Raytheon Co., Sudbury, MA (USA). Equipment Div.
2. Georgia Inst. of Tech., Atlanta, GA (USA). School of Mechanical Engineering

This paper presents a thermal model for predicting the real-time temperatures of an oil-immersed, forced-air cooled transformer. The thermal model consists of a set of three differential equations that are formulated into a computer program. Equations that can be solved for the average real-time temperatures of the core and coil assembly, oil and tank are developed. Expressions for the convection heat transfer coefficients at all internal oil- solid interfaces, equations for calculation of the incident solar radiation and correlations for the convective cooling rate from the external tank and cooling tubes are discussed in detail. The thermal model can predict the real-time transformer temperatures for any variation in electrical loading and for any type of ambient thermal environment.

• OSTI ID: 6718983
• Journal Information: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA), Journal Name: IEEE Transactions on Power Delivery (Institute of Electrical and Electronics Engineers); (USA) Vol. 5:2; ISSN 0885-8977; ISSN ITPDE
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
240100* -- Power Systems-- (1990-)
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CALCULATION METHODS
CONVECTION
DIFFERENTIAL EQUATIONS
ELECTRIC COILS
ELECTRICAL EQUIPMENT
ENERGY TRANSFER
EQUATIONS
EQUIPMENT
FORCED CONVECTION
HEAT TRANSFER
MASS TRANSFER
MATHEMATICAL MODELS
PARTICLE MODELS
RADIATIONS
SOLAR RADIATION
STATISTICAL MODELS
STELLAR RADIATION
THERMODYNAMIC MODEL
TRANSFORMERS