Partial discharge signals from TR-XLPE insulated cable

Abstract

This paper reports on signal measurements from an mag& TR-XLPE-insulated cable at constant voltage stress, prior to the onset of partial discharge, as Conven~OnaUY measured in time domain technique. Although physical events relating to filtering out noise and phase resolution were thoroughly reviewed. The authors claim that such signals had never previously been detected..~I . -increases logarithmically with time, both prior to and after a.thickness iS not reported). The fast pulses appear during the electrical tree is observed. Tree retardant components in the 'first few days' (-1-1.5 fc) and the slow pulses appear after insulation do not prevent such signals from appearing. Relevant 20-25 days. Information on rise time, decay time and peak are reports have been summarked and relevance to aging all reported. Probes were employed at both the treed and nonphenomena are discussed.treed region of the polyethylene, and the regions compared.

Prediction of Incipient Faults in Underground Power Cables Utilizing S-Transform and Support Vector Regression

“…Over time, partially conducting carbonized electrical trees are formed. This places greater stress on the remaining insulation, leading to further growth of the damaged region, resistive heating along the tree, and further charring [3]. This eventually culminates in a complete dielectric failure of the cable and, typically causes an electrical explosion.…”

“…The disadvantage of this technique is related to electrical noises that could exceed the set threshold and create a record resembling fast current pulses, thus, giving a misleading result in the detection of PD. Another similar technique that involved measuring the current pulses during pre-PD conditions was developed in [3]. The measurement of these nondestructive current pulses has practical significance, in which it can detect true PD occurrence.…”