THREE PHASE TRANSFORMERS AS HARMONIC SOURCES IN POWER SYSTEMS.
Date
1983
Authors
Holtzhausen J.P.
Zingel R.G.W.
Journal Title
Journal ISSN
Volume Title
Publisher
South African Inst of Electrical Engineers, Marshalltown, S Afr
Abstract
The generation of harmonic voltages and currents in three phase transformers is analysed and an equivalent third harmonic source is developed. A bank of three phase connected single phase transformers, shell type or five limbed as well as core type three phase transformers are considered. An equivalent circuit which allows for different winding connections is also developed. The parameters of this equivalent circuit are obtained either from measurements with the aid of a harmonic analyser or by calculation. It is shown that although these harmonic sources are generally speaking small in the case of core type transformers, enhancement of these voltages is possible when near resonance occurs with system capacitances. The developed models are supported by measurements.
Description
Keywords
ELECTRIC NETWORKS - Equivalent Circuits, ELECTRIC POWER SYSTEMS, HARMONIC GENERATION, THIRD HARMONICS, ELECTRIC TRANSFORMERS
Citation
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