Artificial Accelerated Ageing Test of 22 kVXLPE Cable for Distribution System Applications in Thailand

This paper presents the experimental results on artificial ageing test of 22 kV XLPE cable for distribution system application in Thailand. XLPE insulating material of 22 kV cable was sliced to 60-70 μm in thick and was subjected to ac high voltage at 23 Ôùª C, 60 Ôùª C and 75 Ôùª C. Testing voltage was constantly applied to the specimen until breakdown. Breakdown voltage and time to breakdown were used to evaluate life time of insulating material. Furthermore, the physical model by J. P. Crine for predicts life time of XLPE insulating material was adopted as life time model and was calculated in order to compare the experimental results. Acceptable life time results were obtained from Crine-s model comparing with the experimental result. In addition, fourier transform infrared spectroscopy (FTIR) for chemical analysis and scanning electron microscope (SEM) for physical analysis were conducted on tested specimens.

Authors:

• A. Rawangpai
• B. Maraungsri
• N. Chomnawang

Keywords:

• Artificial accelerated ageing test
• XLPE cable
• distribution system
• insulating material
• life time
• life time model

References:

[1] X. Qi and S. Boggs, "Thermal and Mechanical Properties of EPR and
XLPE Cable Compounds", IEEE Electrical Insulation Magazine, Vol.
22, No. 3, May/June 2006, pp. 19-24.
[2] V. Vahedy, "Polymer Insulated High Voltage Cables", IEEE Electrical
Insulation Magazine, Vol. 22, No. 3, May/June 2006, pp. 13-18.
[3] B. K. Hwang, "A New Water Tree Retardant XLPE", IEEE Trans. on
Power Delivery, Vol. 5, No. 3, May/June 1990, pp. 1617-1627.
[4] P. Cygan and J. R. Laghari, "Models for Insulation Aging Under
Electrical and Thermal Multi-stresses", IEEE Trans. on Electrical
Insulation, Vol. 25, No. 5, October 1990, pp. 923-934.
[5] G. C. Montanari and M. Cacciari, "A probabilistic life model for
insulating materials showing electrical thresholds", IEEE Trans. on
Electrical Insulation, Vol. 24, No. 1, February 1989, pp. 127-134.
[6] J. P. Crine, J. L. Parpal and C. Dang, "A new approach to the electric
aging of dielectrics", Int. conf. on Electrical Insulation and Dielectric
Phenomena 1989, November 1989, pp 161-167.
[7] IEC 60505, "Evaluation and Qualification of Electrical Insulation
Systems", 1999.
[8] J. P. Crine, "A Molecular Model for the Electrical Aging of XLPE", Int.
Conf. on Electrical Insulation and Dielectric Phenomena 2007,
October 2007, pp. 608-610.
[9] A. Faruk, C. Nursel, A Vilayed and K. Hulya, "Aging of 154 kV
Underground Power Cable Insulation under Combined Thermal and
Electrical Stresses", IEEE Electrical Insulation Magazine, Vol. 23, No.
5, October 2007, pp.25-33.
[10] S. V. Nikolajevic, "Accelerated Aging of XLPE and EPR Cable
Insulations in Wet Conditions," Int. Conf. on IEEE International
Symposium, Virginia, USA, Vol.1, June 1998, pp 93-96
[11] J. P. Crine, "Electrical Aging and Breakdown of XLPE Cables", IEEE
Trans. on Dielectric and Electrical Insulation, October 2002, pp. 23-
26.
[12] J. V. Gulmine and L. Akcelrud, "FTIR Characterization of Aged
XLPE", Polymer Testing, Vol. 25, 2006, pp. 932-942.