Sistema de Baixo Custo para o monitoramento de descargas parciais em transformadores de potencia por sensores pieelétricos (A low cost system for acoustic monitoring of partial discharge in power transformer by piezeletic sensor)

Bruno Albuquerque Castro (bruno.castro@feb.unesp.br)1, Guilherme Augusto Marabezzi Clerice (marabezzi@feb.unesp.br)1, André Luiz Andreoli (andreoli@feb.unesp.br)1, Fernando de Souza Campos (fcampo@feb.unesp.br)1, José Alfredo Covolan Ulson (ulson@feb.unesp.br)1


1UNESP - Univ Estadual Paulista, Brazil

This paper appears in: Revista IEEE América Latina

Publication Date: July 2016
Volume: 14,   Issue: 7 
ISSN: 1548-0992


Abstract:
Partial discharge damages in power transformers require high cost monitoring procedures based on corrective maintenance or even interruptions of the power system. The development of online non-invasive monitoring systems to detect partial discharges in power transformers has great relevance since it can reduce significant maintenance costs. Some critical factors in the operation of transformers such as overload, nonlinear loads, transient voltage surges by atmospheric origin and switching, can make the insulation system of transformers to lose their physical and chemical properties. Therefore, these operating conditions can cause early deterioration of the insulation, causing internal partial discharges that may develop into major defects and thus shorten the useful life of electrical equipment. This research aimed to apply a low cost piezoelectric sensors (PZTs) for partial discharge identification in power transformers and a study was conducted on the obtained a good results for identification with PZTs.

Index Terms:
Partial Discharge, Acoustic Emission, Piezoelectric Sensors, Mitigation.   


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