Location of Repository

Dielectric spectroscopy study of thermally-aged extruded model power cables

By Tong Liu, John C. Fothergill, Stephen J. Dodd, Len A. Dissado, Ulf H. Nilsson, Mingli Fu and Fabrice Perrot

Abstract

“Model” extruded power cables, having a much reduced geometry but using the same extrusion techniques and materials as full-sized cables, have been examined using dielectric spectroscopy techniques to study their thermal ageing effects. Cables insulated with homo-polymer XLPE and co-polymer of XLPE with micron-sized ethylene-butyl-acrylate (EBA) islands were studied by both frequency-domain and time-domain dielectric spectroscopy techniques after accelerated thermal ageing under 135°C for 60 days. In the frequency domain, a frequency response analyzer (FRA) was used to measure the frequency range from 10-4Hz to 1Hz at temperatures from 20°C to 80°C. In the time domain, a special charging/discharging current measurement system was developed to measure the frequencies from 10-1Hz to 102Hz. These techniques were chosen to cope with the extremely low dielectric losses of the model cables. The results are compared with those from new model power cables that were degassed at 80°C for 5 days. Thermal ageing was found to increase the low-frequency conductivity, permittivity and the discharging current. Both homo- and co-polymer cables have substantial increase of dielectric loss after ageing.Peer-reviewedPost-print10th IEEE International Conference on Solid Dielectrics (ICSD), Postdam, German

Topics: dielectric spectroscopy, model power cables, XLPE, thermal ageing
Publisher: IEEE
Year: 2010
DOI identifier: 10.1109/ICSD.2010.5568077
OAI identifier: oai:lra.le.ac.uk:2381/10002

Suggested articles

Preview

Citations

  1. (2003). Applications of Dielectric Spectroscopy in Time and Frequency Domain for HV Power Equipment”, doi
  2. (2001). Dielectric spectroscopy for diagnosis of water tree deterioration in XLPE cables”, doi
  3. (2003). Dielectric spectroscopy in time and frequency domain for HV power equipment. I. Theoretical considerations”, doi
  4. (2009). Dielectric Spectroscopy of XLPE Cables using Discharging Current Measurement”, Cables insulation session, doi
  5. (2005). Electrical Properties of Polymers,
  6. (2005). Sub-Hertz” Dielectric Spectroscopy”, doi
  7. (2009). Ulf Nilsson, “Dielectric Spectroscopy Measurement on Very Low Loss Crosslinked Polyethylene Power Cables”, doi
  8. (1993). Water treeing and dielectric loss of WTRXLPE cable insulation”, doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.