Diagnostic of field aged cables and accessories by time-domain dielectric spectroscopy

Author

David, E. ; Amyot, N. ; Drapeau, J.-F.

Author_Institution

Ecole de Technologie Superieure, Montreal, Que., Canada

fYear

2003

fDate

19-22 Oct. 2003

Firstpage

165

Lastpage

170

Abstract

Dielectric Spectroscopy was used as a diagnostic tool to assess the degradation state of field-aged extruded cables retrieved from underground networks. A high voltage time-domain spectrometer was used to measure the time-domain dielectric response of unaged and field-aged cables up to 25 kV. In addition to time-domain dielectric spectroscopy (TDDS), high voltage frequency-domain dielectric spectroscopy (FDDS) was performed for the sake of comparison. Cables were characterized with respect to water content and water tree density. ACBD strength measurements were also performed on some of the cable samples in order to estimate their state of degradation. Field-aged and unaged cable accessories were also characterized with respect to their dielectric response in order to account for their effect on real line diagnostic.

Keywords

ageing; dielectric losses; dielectric measurement; frequency-domain analysis; underground cables; accessories; degradation state; field aged cables; high voltage frequency-domain dielectric spectroscopy; high voltage time-domain spectrometer; time-domain dielectric spectroscopy; underground networks; water content; water tree density; Aging; Cables; Degradation; Dielectric measurements; Electrochemical impedance spectroscopy; Performance evaluation; State estimation; Time domain analysis; Trees - insulation; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2003. Annual Report. Conference on

Print_ISBN

0-7803-7910-1

Type

conf

DOI

10.1109/CEIDP.2003.1254820

Filename

1254820