A multifactor framework linking insulation ageing and power network environments

The development of a multifactor framework which links ageing of insulation systems to power network performance is described. The framework provides a platform on which to develop models of plant reliability, identifying direct relationships between the working environment of the equipment and the ageing and failure processes of the insulation system. The evolution of the working environment is far from trivial and requires a stochastic modeling approach. The framework establishes links between the physics and chemistry of insulation degradation, the management of power quality and load flows in the network, thus linking plant reliability to asset management. In this paper, as an example of its use, the framework is used to provide a qualitative analysis and contrast of ageing and failure of insulation systems in high and low voltage networks. Finally, it is also shown to provide a platform for future research in the area.

[1]  J. Densley,et al.  Ageing and diagnostics in extruded insulations for power cables , 1995, Proceedings of 1995 IEEE 5th International Conference on Conduction and Breakdown in Solid Dielectrics.

[2]  H. W. Ng,et al.  Effects of voltage impulses on extruded dielectric cable life , 1989 .

[3]  J. Densley,et al.  Ageing mechanisms and diagnostics for power cables - an overview , 2001 .

[4]  Weijun Yin,et al.  Failure mechanism of winding insulations in inverter-fed motors , 1997 .

[5]  S. Cherukupalli,et al.  Condition assessment of distribution PILC cables from electrical, chemical, and dielectric measurements , 2004, IEEE Electrical Insulation Magazine.

[6]  R. Bartnikas,et al.  Electrical aging and electroluminescence in epoxy under repetitive voltage surges , 1992 .

[7]  Luo Li,et al.  Electrical tree inception characteristics of XLPE insulation under power-frequency voltage and superimposed impulse voltage , 1999 .

[8]  Davide Fabiani,et al.  The effect of nonsinusoidal voltage on intrinsic aging of cable and capacitor insulating materials , 1999 .

[9]  G. C. Montanari,et al.  Investigation of aging rate in polymer films subjected to surface discharges under distorted voltage , 1997, IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena.

[10]  Gian Carlo Montanari,et al.  An approach to life estimation of electrical plant components in the presence of harmonic distortion , 2000, Ninth International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.00EX441).

[11]  Thomas W. Dakin,et al.  Electrical Insulation Deterioration Treated as a Chemical Rate Phenomenon , 1948, Transactions of the American Institute of Electrical Engineers.

[12]  C. M. Walton.  Incipient fault detection and management of underground LV networks , 2001 .

[13]  Graham Williams,et al.  Conference on Electrical Insulation and Dielectric Phenomena , 1982, IEEE Transactions on Electrical Insulation.

[14]  Davide Fabiani,et al.  The effect of voltage distortion on ageing acceleration of insulation systems under partial discharge activity , 2001 .

[15]  F. Guastavino,et al.  An experimental study about the treeing phenomena in XLPE subjected to distorted voltages , 2003, 2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena.