XAVIER, G. V. R.; XAVIER, GEORGE V. R.; XAVIER, GEORGE.; http://lattes.cnpq.br/8784190947367548; XAVIER, George Victor Rocha.
Résumé:
This work presents the development of a circular microstrip antenna for the detection of
partial discharges in power transformers. For this purpose, the truncated ground plane
and slotted plane bandwidth enhancement techniques were used. In addition, aiming the
achivement of an optmized structure in performance and size, computational simulations
with several combinations of the studied antennas dimensional parameters were perfor-
med. In order to verify if the developed antenna reach the prerequisites (bandwidth and
gain) for the practical application in the detection of partial discharges, the optimized
antena was built and subjected to preliminary tests in the anechoic chamber available
on the Laboratory of Metrology of the Federal University of Campina Grande (UFCG),
in Paraíba. Lastly, the antenna sensitivity of detection was verified by means of com-
parative tests with the standard IEC 60270 method established for the measurement of
partial discharges. For this purpose, the antenna and the IEC 60270 method were ap-
plied simultaneously in a partial discharge generator arrangement, composed by an oil cell
with tip–plane and plane–plane electrodes configurations, mounted in the High Voltage
Laboratory of UFCG. The developed antenna presented good sensitivity results in the
detection of partial discharges, detecting apparent charge values higher than 30 pC and
presenting an average gain greater than 2 dB for the range of operation reached. The
results obtained from this work attested the developed antenna potential, and can be
used as base technology for the development of an UHF sensor for the detection of partial
discharges in power transformers.
