Resumo:
Nowadays, in power systems, the concept of reliability is getting more and more
importance. Therefore, it is a tough task to take any equipment out of operation to carry
out some tests in order to know its behavior under some phenomena that can occur in
the power system (short-circuit, energization, transferred surges, etc.).
The improvement of the computer systems allowed that even the most complex
calculations could be ready quickly. Thus, the evaluation of the behavior of the power
system equipments can be done almost in a real-time way.
The development of models of these equipments that presents a good
attachment with their actual behavior avoids them to be taken out of operation and
then, the power system reliability is maintained.
This work aims at getting a model to carry out high frequency studies
(Transformer Transfer Function and Transferred Voltage). This work also aims getting
at a transformer winding model in order to make it easier the evaluation of some
signals that appear in the current wave shape obtained during the lightning impulse
tests. Simulations are carried out and comparisons between their results and testing
one are presented.