| dc.description.abstract | This paper presents the
investigation of the variation of core loss
due to the effect of pin holes in the
transformer core which are used to stack
the core sheets in a step lap pattern. A
three-phase distribution transformer with
a rating of 160 kVA, 11 kV/ 415 V has been
selected for the investigation. The
transformer model was developed using
SolidWorks software and examined for the
no-load loss using finite element analysis
software ANSYS Maxwell. Simulation
results were obtained for different pin hole
sizes and positions. The flux variations in
the core, with and without pin holes are
analyzed. Based on the core loss, the
optimum pin hole diameter and positions
are determined. Analysis shows that the
hysteresis loss is not significantly affected
by the pin holes while the eddy current loss
has an effect from pin hole diameters.
Analyzing the results, the optimum pin hole
diameter is determined as 6 mm
corresponding to an increased loss of
under 1% of the loss. Results further show
that placing the pin holes where the flux
distribution is a minimum, reduces the core
loss. The results of the analysis are planned
to be implemented in an actual distribution
transformer. | en_US |
