A method for modeling nonlinear core characteristics of transformers during transients

An EHV transformer's insulation system must be designed to withstand stresses generated during transient events. Computer models are employed for predetermination of these stresses. The lack of accurate and consistent computer models for use by both utilities and manufacturers, is felt to contr...

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Bibliographic Details
Published in:IEEE transactions on power delivery 1994-10, Vol.9 (4), p.1916-1925
Main Authors: Vakilian, M., Degeneff, R.C.
Format: Article
Language:English
Subjects:
AC SYSTEMS
Circuit faults
Computer aided manufacturing
EHV AC SYSTEMS
ELECTRICAL EQUIPMENT
ELECTRICAL TRANSIENTS
ENERGY SYSTEMS
Magnetic cores
MATHEMATICAL MODELS
NONLINEAR PROBLEMS
Power engineering computing
Power system modeling
POWER SYSTEMS
Power transformer insulation
POWER TRANSMISSION AND DISTRIBUTION
Stress
Surges
Transformer cores
TRANSFORMERS
TRANSIENTS
Virtual manufacturing
VOLTAGE DROP 240201 > Power System Networks, Transmission & Distribution-- AC Systems-- (1990-)
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Summary:An EHV transformer's insulation system must be designed to withstand stresses generated during transient events. Computer models are employed for predetermination of these stresses. The lack of accurate and consistent computer models for use by both utilities and manufacturers, is felt to contribute to the relatively high failure rate of EHV transformers. This paper develops a detailed nonlinear transformer model and a solution method that improves the accuracy with which the effect of the nonlinear characteristic of the magnetic core during transients can be predicted. This model is based on linearization of the core's saturable characteristic during solution time intervals. This paper describes a nonlinear, single phase, detailed transformer model and its verification against measured data.< >
ISSN:0885-8977
1937-4208
DOI:10.1109/61.329524