On-line time domain reflectometry measurements of temperature variations of an XLPE power cable

In this paper an on-line time domain reflectometry system and a four-days measurements sequence are presented. Detected pulse velocity variations are attributed to temperature variations of the cable caused by a load cycling. The changes in the pulse velocity are verified by propagation constant measurements of a power cable at different temperatures in 300 kHz-500 MHz frequency range. Also an influence of temperature dependent semiconducting screens and XLPE insulation to the changes in the cable's capacitance is investigated.

[1]  R. Eriksson,et al.  Measurement technique for high frequency characterization of semiconducting materials in extruded cables , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[2]  J. Fourmigue,et al.  Multiple dielectric relaxation mechanisms in XLPE cable insulation , 1992, [Proceedings] 1992 Annual Report: Conference on Electrical Insulation and Dielectric Phenomena.

[3]  Ruslan Papazyan.  Techniques for Localization of Insulation Degradation along Medium-Voltage Power Cables , 2005 .

[4]  Gavita Mugala.  Influence of the semi-conducting screens on the wave propagation characteristics of medium voltage extruded cables , 2003 .

[5]  R. N. Hampton,et al.  The effect of hydrostatic pressure and temperature on the permittivity of crosslinked polyethylene , 1996 .

[6]  Arthur Hartog,et al.  Distributed fibre-optic temperature sensors: Technology and applications in the power industry , 1995 .

[7]  J.-P. Crine,et al.  Electrical, chemical and mechanical processes in water treeing , 1998 .

[8]  H. Edin,et al.  Couplers for on-line time domain reflectometry diagnostics of power cables , 2004, The 17th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2004. LEOS 2004..

[9]  H. Edin,et al.  Extraction of high frequency power cable characteristics from S-parameter measurements , 2004, IEEE Transactions on Dielectrics and Electrical Insulation.

[10]  T. Tanaka,et al.  Aging of polymeric and composite insulating materials. Aspects of interfacial performance in aging , 2002 .

[11]  E. F. Steennis,et al.  Water treeing in polyethylene cables , 1990 .