Abstract
In practice, cross-linked polyethylene (XLPE) power cables can be subjected to alternating voltage with superimposed impulse transients. Such impulse transients may initiate partial discharges (PD) in insulation defects even below AC inception voltage. An initiated PD may persist under AC, which will cause insulation degradation. This paper investigates the PD behavior in MV XLPE cable accessories under impulse transients. Different scenarios of PD behavior are measured, described and analyzed. Based on the results, the effects of impulse transients on PD are summarized.
Highlights
With their excellent technical properties, cross-linked polyethylene (XLPE) underground cables for all voltage levels of AC are increasingly dominating newly installed cable populations
This paper investigates the partial discharges (PD) behavior in MV XLPE cable accessories under impulse transients
In order to better understand the PD behaviour in a cable, this paper investigates the characteristics of PD for artificial defects in a MV XLPE cable joint under superimposed impulse transients
Summary
With their excellent technical properties, cross-linked polyethylene (XLPE) underground cables for all voltage levels of AC are increasingly dominating newly installed cable populations. More than half of the failures are caused by internal defects in the cable insulation system, in particular in the cable accessories. This is due to the insulation interfacial defects, which were introduced during installation [2,3]. Even PDs are not initiated by operating AC voltage, they might be ignited by impulse transients and keep sustained afterwards. - Cathode defect site there is an enhancement in the electric field which drives the PD occurring. The first one Ec is an enhancement of the background field E0 inside the insulation, which is caused by the lower permittivity in the defect and the defect shape.
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