Resumo

CASALS-TORRENS, P.; GONZALEZ-PARADA, A.  e  BOSCH-TOUS, R.. Online Monitoring of Accessories for Underground Electrical Installations through Acoustics Emissions. Ing. invest. y tecnol. [online]. 2012, vol.13, n.2, pp.249-256. ISSN 2594-0732.

The acoustic waves caused by Partial Discharges inside the dielectric materials, can be detected by acoustic emission (AE) sensors and analyzed in the time domain. The experimental results presented, show the online detection capability of these sensors in the environment near a cable accessory, such as a splice or terminal. The AE sensors are immune to electromagnetic interference and constitute a detection method non-intrusive and non-destructive, which ensures a galvanic decoupling with respect to electric networks, this technique of partial discharge detection can be applied as a test method for preventive or predictive maintenance (condition-based maintenance) to equipments or facilities of medium and high voltage in service and represents an alternative method to electrical detection systems, conventional or not, that continue to rely on the detection of current pulses. This paper presents characterization tests of the sensors AE through comparative tests of partial discharge on accessories for underground power cables.

Palavras-chave : power cables; underground installation; partial discharges; failure detection; online detection; acoustic detection.

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