Influence of Partial Arc on Electric Field Distribution of Insulator Strings for Electrified Railway Catenary

Shanpeng Zhao, Chenrui Zhang, Youpeng Zhang and Sihua Wang
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Shanpeng Zhao: School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Anning District, Lanzhou 730070, China
Chenrui Zhang: School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Anning District, Lanzhou 730070, China
Youpeng Zhang: School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Anning District, Lanzhou 730070, China
Sihua Wang: School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Anning District, Lanzhou 730070, China

Energies, 2019, vol. 12, issue 17, 1-16

Abstract: The occurrence of a partial arc can affect insulation properties of the insulator by different types of flashover. In order to investigate the influence of a partial arc on electric field distribution along the catenary insulator string, a three-dimensional model of the cap-pin insulator string with partial arc was established in this paper. The electric field distribution along the insulator string when the arc extended on the insulator surface and bridged sheds was investigated based on the electric field analysis using the finite element method. The results showed that the occurrence of a partial arc caused obvious distortion of the electric field, which was a two-dimensional axis symmetrical field before arcing to a three-dimensional field. In the case of arc extension, the sudden rise of field intensity was mostly at the rib and the shed edge, which had the local maximum field intensity. The rib and the shed edge played a certain hindrance role in the extension of the arc. The main reason for promoting the development of the arc can be attributed to thermal ionization. In the case of arc bridge sheds, the highest field intensity appeared at the edge of the last bridged shed. As the number of sheds arc-bridged increased, the maximum field intensity also increased. As the arc length increased, the electric field intensity of the arc head also increased, which resulted in an accelerated arc development. The main factor to promote the development of the arc can be attributed to electrical breakdown. The measures to hinder the rapid development of partial arcs were proposed.

Keywords: finite element method; electric field distribution; partial arc; insulator string; electrified railway catenary (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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