退运中压XLPE和EPR电缆老化特性分析

doi:10.19595/j.cnki.1000-6753.tces.191405

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Abstract Through the insulation and dielectric performance tests, the aging characteristics and interfacial polarization effects of service-aged ethylene-propylene rubber (EPR) and cross-linked polyethylene (XLPE) cables were studied. Broadband dielectric spectrum test and infrared spectrum analysis of cables insulation were carried out. It is shown that there are significant differences in the dielectric parameters and the absorption peak value of the inner and outer sides. The component of interfacial polarization current was extracted from polarization and depolarization current (PDC) test for the new cables and retired cables at different voltages. The results show that inhomogeneous aging phenomenon exists in retired cables insulation, and the aging degree of the inside insulation is more serious than that of the outside insulation. There is interfacial polarization current during the PDC test because of the interfacial effect. The more serious of the insulation inhomogeneous degree, the higher the PDC test voltage is, and the larger the interfacial polarization current is. Infrared relative absorption ratio R_n and interfacial polarization charge Q can be used to represent the inhomogeneous aging degree and interfacial polarization intensity of insulation, and the insulation characteristics of service-aged cables can be analyzed.

Key words： XLPE cables EPR cables polarization and depolarization current inhomogeneous aging interfacial polarization

Received: 24 October 2019

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TM247

	Service

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	Zhou Kai
	Li Shiyu
	Yin You
	Lin Siyan
	Yun Hao

Cite this article:

Zhou Kai,Li Shiyu,Yin You等. Analysis of Aging Characteristics of Medium Voltage XLPE and EPR Retired Cables[J]. Transactions of China Electrotechnical Society, 2020, 35(24): 5197-5206.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191405 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I24/5197

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