Abstract
Monitoring and diagnosis of power transformers in
power systems have been investigated and discussed for the past
decades. Earlier detect power transformer winding failures is
recommended for both manufacturing process and also for
power system operators. One of the most powerful and accurate
tool for sufficient winding deformation detection is considered
Frequency Response Analysis (FRA) among other diagnostic
methods. In this paper a review of diagnostic methods of FRA
for power transformer winding are presented. Different
methods of transformer winding diagnosis, with their benefits
and drawbacks where investigated. Moreover, possible windings
failures, diagnostic methods of FRA in Off-line and On-line
power transformers, detailed advantages and disadvantages of
two major types of FRA are presented. The paper was able to
show that some uncertainties have not been eliminated
completely.