Localização de descargas parciais baseada em um método radiométrico - prova do princípio.

Abstract

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.