Original scientific paper
CALCULATION OF VOLTAGE DISTRIBUTION ALONG THE TRANSFORMER WINDING USING THE WIDE BAND TRANSFORMER MODEL
BRUNO JURIŠIĆ
orcid.org/0000-0002-9950-5724
; Faculty of Electrical Engineering and Computing, University of Zagreb Unska 3, 10000 Zagreb, Croatia
LUKA BUČAR
IVO UGLEŠIĆ
Abstract
Electrical devices in transmission and distribution networks are submitted to
fast front transients. These transients are often a cause of a failure in the power
system. To simulate these phenomena, it is necessary to detailly model all the
components of the power system. This paper concentrates on studding transformer
internal failures due to voltage stress that can occur when fast front
electromagnetic wave travels through the transformer. To prevent a failure, an
internal insulation of the transformer has to be dimensioned to sustain these
transient phenomena. Therefore, it is necessary to use advanced wideband
transformer models for its dimensioning.
In this paper, a wide band transformer model based on limited transformer
geometry is used to simulate evaluate the stresses on internal transformer
insulation in the case of fast front transients. The model is validated for calculation
of internal overvoltages with the test case from CIGRE brochure.
Keywords
Fast front transients; transformer; Grey Box; internal insulation; voltage distribution
Hrčak ID:
199739
URI
Publication date:
15.12.2017.
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