Partial Discharge Diagnosis of Medium Voltage Power Cables
Abstract
In this paper, the basic principles of partial discharges (PD) are described, including off- line and on-line methods and the basic concepts for understanding and using aforementioned approaches are clarified. Considering the large number of cables in the distribution network, it is unrealistic to expect all cables to be analyzed in detail. For this purpose it is useful to use a hand-held PD detector to make online pre-selection of cables for a more detailed off-line diagnostic analysis. Selected sections of the distribution grid are disconnected and analyzed in detail using off- line method. PD in the cable can be located by analyzing the measured data. Other diagnostic methods provide general insight into the state of insulation while PD enables localization of the malfunction section. In this way a badly made junction or cable termination can be located and preventively replaced.
Tonko Garma
Full Professor | Department of Electrical Measurements
Goran Petrović
Full Professor | Department of Electrical Measurements
Prof. dr. sc. Goran Petrović is a full professor at the Faculty of Electrical Engineering, Mechanical Engineering and Architecture in Split. His research interests include measurement of electrical and process quantities, analysis of geoelectrical and geothermal features of the soil, instrumentation for smart grids, measurement and application of synchrophasors. He is the author of numerous papers published in top-tier scientific journals and contributed to valuable international and national scientific projects.
Tomislav Kilić
Full Professor | Department of Electrical Measurements
Full professor at the at the Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture in Split, with professional reserch focus on power quality, signal analysis in electrical power systems, and measurement of process variables, alongside a significant role in the academic and administrative life of the University of Split.