Evaluation of a Low-cost Capacitive Non-intrusive Sensor for the Detection, Localization and Identification of Defects in MVAC Cables
Résumé
artial discharges (PDs) monitoring is a common
tool for diagnosing electrical systems. An innovative, low-cost
sensor for distance detection and positioning of partial PDs has
been developed. An ambitious challenge for this PD monitoring
system is to predict dielectric breakdowns on a grid and
particularly in MVAC cables. The first part of the article
demonstrates the proper functioning of this sensor on a test
bench. In a second part, monitoring measurements of PD
activity issued from artificial defects are presented. PD initiated
in submillimetric cavities were collected. Parameters and PD
patterns have been interpreted with the aim to correlate with
the electrical treeing propagation until breakdown. The final
section is dedicated to a concise review of electrical treeing
monitoring. Analysis of existing approaches are presented, as
well as the interesting opportunities offered by the sensor.