SOUZA NETO, J. M. R.; http://lattes.cnpq.br/6354668326581094; SOUZA NETO, José Maurício Ramos de.
Resumen:
The thesis reported here is the result of a PhD research related to the proof of principle
of a new type of radiometric system applied to detection and location estimation
of partial discharges sources. Partial Discharge (PD) measurement is an established
high voltage insulation monitoring technique used to facilitate the detection of incipient
faults in high voltage apparatus. Based on the great importance of the power
system, is constant the research about the nature and characteristics of PD sources. A
low-cost (compared to the monitored item), free-standing, radiometric, partial discharge
monitoring system is described for application to real-time condition monitoring, asset
management and operations optimization in the future smart grid. The proposed PD
monitoring system is based on a novel approach to PD location which uses power ratios
to obviates the need for synchronization between sensors thereby improving scalability.
The high sampling rate requirement is also avoided by the use of an envelope detector.
For the proposed evaluation of PD signals, several measurements were performed using
a diskcone antenna and a commercial system based on the IEC 60270 standard. These
measurements reported here suggests successfully that partial discharge sources might
be detected and located using power-only free-space radiometric measurements. The
measurements were made in two locations with similar measurement protocols by three
collaborating research groups. One measurement set is more encouraging than the other
but a likely explanation for the disparate nature of the results is offered. It is suggested
that a system based on amplitude only measurements might form the basis of a low-cost
wireless sensor network for monitoring partial discharge in electricity substation.
