等温松弛法在三元乙丙橡胶绝缘电缆连接器的老化评估中的应用研究  

Application of isothermal relaxation to aging assessment of EPDM rubber insulated cable connectors

作　　者：高树国[1] 朱永华[2] 吴长顺[2] 吴建东[3] 尹毅[3] 

机构地区：[1]国网河北省电力公司电力科学研究院,河北石家庄050021 [2]上海电缆研究所中试室,上海200093 [3]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《电工电能新技术》2015年第5期76-80,共5页Advanced Technology of Electrical Engineering and Energy

摘　　要：本文采用等温松弛电流法测量了不同老化程度的电缆连接器绝缘的等温松弛电流,建立了基于界面极化理论的等温松弛电流模型,分析了老化引起的缺陷对总体的松弛电流的影响,定义了表征电缆连接器绝缘老化程度的参数——老化因子A,并且计算了不同老化程度的电缆连接器绝缘的老化因子。结果表明随着老化时间的增加,老化因子值也在增加。另外,基于ASTM E698标准测量了活化能,结果表明随着老化时间的增加,活化能减小,这与老化因子之间存在良好的对应关系,表明等温松弛电流法可对电缆连接器的绝缘老化程度进行有效评估。Isothermal relaxation current of cable connector insulation is measured with a method of isothermal relaxation current（ IRC）. The aging status of the connector insulation is described with a model based on the interface polarization theory. It is pointed out that the aging degree of the connector insulation can be quantified with a parameter of aging factor. It is shown that the aging factor of the connectors increases with aging time. To confirm the accuracy in connector aging accessing,activation energy of the connectors is investigated with thermogravimetry（ TG） according to the standard of ASTM E698. It is shown that the activation energy decreases with aging time.Therefore,there is a good consistence between the aging factor and the activation energy. Also it is a good evidence to the accuracy of aging status assessment in cable connector.

关 键 词：等温松弛电流法 电缆连接器 老化评估 老化因子 热失重 活化能 

分 类 号：TM85[电气工程—高电压与绝缘技术]