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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摘要通过对退运交联聚乙烯（XLPE）和乙丙橡胶（EPR）电缆进行理化性能测试和介电性能测试,研究退运电缆老化特性及界面极化效应。对电缆绝缘进行宽频介电谱测试和红外光谱分析,发现退运电缆绝缘内外侧的介电参数和各特征基团吸收峰强存在明显差异。通过对新电缆与退运电缆进行不同电压下的极化去极化电流（PDC）测试,提取了界面极化电流成分。结果表明：退运电缆存在非均匀老化现象,绝缘内侧老化程度较外侧更严重,绝缘内部存在“界面效应”,在PDC测试过程中存在界面极化电流,且绝缘非均匀老化程度越严重、PDC测试电压越高,界面极化电流越大。可以采用红外基团相对吸收比R_n表征绝缘非均匀老化程度,采用界面极化电荷量Q表征绝缘界面极化强度,以对运行老化电缆的老化特性进行分析。

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关键词 ：交联聚乙烯电缆, 乙丙橡胶电缆, 极化去极化电流, 非均匀老化, 界面极化

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

收稿日期: 2019-10-24

PACS:

TM247

通讯作者: 尹游男,1995年生,硕士研究生,研究方向为电缆的绝缘老化与状态监测。E-mail: scu_yinyou@163.com

作者简介: 周凯男,1975年生,教授,博士生导师,研究方向为电缆状态监测及固体电介质。E-mail: zhoukai_scu@163.com

引用本文:

周凯, 李诗雨, 尹游, 林思衍, 云浩. 退运中压XLPE和EPR电缆老化特性分析[J]. 电工技术学报, 2020, 35(24): 5197-5206. Zhou Kai, Li Shiyu, Yin You, Lin Siyan, Yun Hao. Analysis of Aging Characteristics of Medium Voltage XLPE and EPR Retired Cables. Transactions of China Electrotechnical Society, 2020, 35(24): 5197-5206.

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