Derating of Anisotropic Transformers under Nonsinusoidal Operating Conditions

An iterative algorithm is developed for the computation of transformer derating factors (functions) under (non)sinusoidal excitation and linear ( R, RL, RC) loads. The proposed nonlinear model is a combination of frequency domain (to incorporate harmonics) and time domain (to account for saturation)...

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Bibliographic Details
Published in:International journal of electrical power & energy systems 2003, Vol.25 (1), p.1-12
Main Authors: Masoum, M.A.S, Fuchs, E.F
Format: Article
Language:English
Subjects:
Applied sciences
Derating
Electrical engineering. Electrical power engineering
Exact sciences and technology
Harmonics
Power electronics, power supplies
Power quality
Transformers
Transformers and inductors
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Summary:An iterative algorithm is developed for the computation of transformer derating factors (functions) under (non)sinusoidal excitation and linear ( R, RL, RC) loads. The proposed nonlinear model is a combination of frequency domain (to incorporate harmonics) and time domain (to account for saturation) techniques and only requires transformer parameters and λ– i characteristics. The derating factors are generated using the computed transformer apparent powers under ‘rated losses’ and ‘rated fundamental output voltage’ conditions. Computed voltage and current waveforms and total losses are compared with measurements and show good agreements.
ISSN:0142-0615
1879-3517
DOI:10.1016/S0142-0615(01)00091-6