Effect of Frequency and Boost on the Breakdown of XLPE Cable with Inserted Needle Defects

Wei Wei Li; Qiang Shi

doi:10.4028/www.scientific.net/AMR.986-987.1817

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 986-987Effect of Frequency and Boost on the Breakdown of...

Effect of Frequency and Boost on the Breakdown of XLPE Cable with Inserted Needle Defects

Abstract:

Cross-linked polyethylene cables are widely used in power transmission system. In this work the effect of frequency and boost on the breakdown performance of XLPE cable with inserted needle defects was investigated by the frequency-tund resonant system with frequency ranging from 20Hz to 300Hz. The breakdown paths were observed by an optical microscope, and the fractal dimensions of the paths were estimated according to box-counting method. It was found that, with the increase of frequency, the variation of path fractal dimension as a function of frequency corresponded to that of breakdown voltage. Compared with the continuous boost method, the frequency, at which the fractal dimension of breakdown paths approached saturation and the breakdown voltage peaked, became lower under step test method. The increase of breakdown voltage is due to the increase of electrical power used for the initiation and development of dense discharge paths.

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Periodical:

Advanced Materials Research (Volumes 986-987)

Pages:

1817-1820

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.986-987.1817

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Online since:

July 2014

Authors:

Wei Wei Li*, Qiang Shi

Keywords:

Boost, Breakdown, Cross-Linked Polyethylene, Frequency

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