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Analysis of the insulation deterioration of high voltage cross-linked polyethylene power cables (XLPE) under switching impulses stress

N. PAMUK1,*

Affiliation

  1. Turkish Electricity Transmission Company / 54100 - Sakarya, Turkey

Abstract

Electric power systems include a large number of expensive and crucial power cable systems over many decades. Every power cable is composed of at least two components; an electrical conductor, and the conductor insulation which prevents direct contact or unsafe proximity between conductor and other objects. The need to provide adequate electrical insulation which will also permit heat to be conducted and dissipated poses technical challenges at higher voltages. The insulation systems of high-voltage power cables and their accessories are subject to different kinds of stresses during their service life and thus suffer degradation and deterioration. The insulation materials of the high voltage cross-linked polyethylene power cables (XLPE) will be placed under high electrical stress caused by switching impulse. These high voltage switching impulse have an important effect on the aging of the insulation materials. These can lead to a reduction of life which in turn can lower the reliability of electrical power systems. This paper presents deterioration of XLPE-insulation will change insulation material properties and it should be possible to detect these changes with electrical analysis. These changes can lower the voltage withstand level of XLPE cables. Methods such as measurement of partial discharge parameters, and alternative current breakdown voltages analysis were used to determine the degree of deterioration..

Keywords

Switching Impulse stress, Insulation deterioration, XLPE power cable, Reliability.

Submitted at: May 27, 2014
Accepted at: Nov. 13, 2014

Citation

N. PAMUK, Analysis of the insulation deterioration of high voltage cross-linked polyethylene power cables (XLPE) under switching impulses stress, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 11-12, pp. 1392-1399 (2014)