Özet:
Transformers are in more critical applications in
the renewable energy world and having a transformer fail in
such a cyclical power station can be disastrous. Over voltage or
voltage strike is the most important phenomena for the
transformers. Thus, the evaluating and estimating the effects and
stresses of these sudden high voltages is important during the
transformers life time operation and design stage. Accordingly in
this paper the electromagnetic field analyses of the lightning
impulse on Photovoltaic (PV) transformer are investigated using
ANSYS Maxwell software. The 3D and 2D model simulation of
the PV transformer is carried out to determine the electric field
and voltage distribution on critical regions which can cause
breakdown on insulation material and damage transformer
windings and affects transformer working. Afterwards according
to the simulation result, the subjected transformer was designed
considering the relative critical regions and performs the full
wave lightning impulse test in factory area to verify the dielectric
strength of the transformer. This study provides better
understanding of the lightning impulse voltage effects with
localization of the critical regions on the PV transformer and
helps to improve the withstand capability of the transformer
against the lightning impulse voltages during the design and
production stage.