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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Oyegoke, B.S. Birtwhistle, D. Lyall, J. Saha, T.K. |
| Copyright Year | 2006 |
| Description | Author affiliation: Queensland Univ. of Technol., Brisbane, Qld. (Oyegoke, B.S.; Birtwhistle, D.; Lyall, J.) |
| Abstract | During dielectric response measurements on samples of XLPE 22 kV cable that were known to have been severely-degraded in service by water trees, it was observed that the insulation of the cable appeared to degrade considerably after water-immersed cable sample were connected to the rated voltage AC supply. This paper describes results of systematic experiments made to investigate this factor further using polarisation and depolarisation current (PDC) equipment to measure the condition of cable samples. It is found that the cable condition appears to improve from poor to good condition within a few days after short circuiting of the previously-energised cable commenced. Conversely it is found that the condition of the cable appears to degenerate over time following re-application of the rated voltage to the cable samples. It is hypothesised that electrostatic forces maintain moisture in the trees during energisation and that the moisture retreats from the trees when the supply voltage is removed. The implication of this phenomenon on dielectric response measurements is discussed in the paper. |
| Starting Page | 704 |
| Ending Page | 707 |
| File Size | 842598 |
| Page Count | 4 |
| File Format | |
| ISBN | 1424405467 |
| DOI | 10.1109/CEIDP.2006.312029 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-10-15 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Degradation Voltage Dielectric measurements Moisture Trees - insulation Cable insulation Dielectrics and electrical insulation Polarization Current measurement Circuits |
| Content Type | Text |
| Resource Type | Article |
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