Inhibition of Rejuvenation Liquid on Trees in XLPE Cables under Switching Impulse Voltages

Guangya Zhu, Kai Zhou, Wei Gong, Min He, Jiaming Kong and Kangle Li
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Guangya Zhu: School of Electrical Engineering and Information, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Kai Zhou: School of Electrical Engineering and Information, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Wei Gong: School of Electrical Engineering and Information, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Min He: School of Electrical Engineering and Information, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Jiaming Kong: School of Electrical Engineering and Information, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China
Kangle Li: School of Electrical Engineering and Information, Sichuan University, No. 24 Yihuan Road, Chengdu 610065, China

Energies, 2019, vol. 12, issue 11, 1-14

Abstract: In this paper, the inhibitory effect of preinjected rejuvenation liquid on trees in cross-linked polyethylene (XLPE) cables was investigated. Experimental samples were prepared by inserting needles into XLPE samples, and many equally-spaced holes existed in the outer semiconductive layer. All cable samples were divided into two groups. One sample group was treated with rejuvenation liquid, while the other group was the control group. A tree accelerated aging system was used to obtain trees in the XLPE cable samples. During the aging experiment, an impulse voltage was applied to the samples repeatedly. The micromorphologies of the two groups were observed. Based on the micromorphologies, two parameters were determined: the initiation rate of electrical trees and the average length of trees. Furthermore, the electric field distribution was simulated to analyze the initiation of electrical trees. The results indicate that an electrical tree is much harder to initiate in the pretreated XLPE cables than in the untreated cables. This phenomenon is likely attributed to the dielectrophoretic forces in the pretreated cables. Moreover, rejuvenation liquid deposited in XLPE causes a substantial reduction in the Maxwell stress of molecular chains. Rejuvenation liquid inhibits electrical tree initiation and water tree growth to a great extent.

Keywords: cross-linked polyethylene (XLPE); pre-injected rejuvenation liquid; inhibition effect; water trees; electrical trees (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 complete reference list from CitEc
Citations: View citations in EconPapers (1)

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