ACOUSTIC
EMISSION & NDT SCIENTIFIC PUBLICATIONS
Acoustic
Emission
Based Detection and Location of Partial Discharge in
Transformers
4th National Conference of H.S.N.T. and 2nd
Balkan Conference of
BSNDT Athens,
November 2, 2002
Dimitrios A. Kouroussis, Athanasios A. Anastasopoulos, Apostolos
N. Tsimogiannis
Partial Discharge (PD) is an
electrical phenomenon that occurs within a transformer whenever
the voltage load is sufficient to produce ionization, partially
bridging the insulation between the conductors. In an operating
transformer, any PD is a cause for concern, as it is one of the
major reasons that can damage and shorten the life of a
transformer. Partial discharge detection using Acoustic Emission
helps to identify faulty transformers at early stages.
Additionally, it is the only method available for locating the
source of PD in-service and in real-time. Delays in
manufacturing and repairs can be avoided, either at the factory
or in the field, by applying Acoustic Emission techniques that
can identify and locate partial discharge sources as well as
loose parts in the transformer. The present work outlines the
use of Acoustic Emission for the detection and 3-dimensional
location of PD occurrences in transformers. Comparison with
other techniques and characteristic case studies are, also,
presented.