Abstract
This paper presents a case study on fault location, characterization and diagnosis in a length of shielded 11 kV medium voltage ethylene-propylene rubber (EPR) power cable. The defect was identified on-site as a low resistance fault occurring between the sheath and the core. A 43 m section was removed for further analysis. The fault resistance was characterized and the location of the defect pinpointed to within a few cm using a combination of time-difference-of-arrival location and infra-red imaging. A combination of X-ray computed tomography, scanning electron microscopy and energy dispersive X-ray spectroscopy were then applied to characterize any abnormalities in the dielectric surrounding the breakdown region.
Original language | English |
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Pages (from-to) | 10-18 |
Number of pages | 9 |
Journal | IEEE Transactions on Dielectrics and Electrical Insulation |
Volume | 20 |
Issue number | 1 |
DOIs | |
Publication status | Published - Feb 2012 |
Keywords
- condition monitoring
- power system faults
- dielectric breakdown
- power cable insulation
- X-ray imaging