摘要
为研究不同测试温度对水树老化电缆的极化去极化电流法(PDC)检测结果的影响,采用水针电极法对10 kV XLPE短电缆进行90天加速老化,并在恒温恒湿下对老化前后电缆进行了PDC测试。通过分析电缆样本的极化去极化电流,获取并考察了电缆样本的电导率及低频介质损耗谱。结果表明:在实验选取的测试温度下,电缆老化前后的电导率随温度变化的规律相同,均在40℃略微下降后随温度逐步上升;介质损耗谱中,未老化样本的极化强度低,极化损耗随温度变化较小,介损主要受电导率影响,故测试结果明显分为两个区域。水树老化样本的极化强度较大,受温度影响明显,其低频介损随温度上升呈现先上升后下降的趋势,并在60℃出现最大值。
In order to study the influence of temperature on the test result of water tree ageing cable by polarization and depolarization current method（PDC）, 10 kV XLPE short cables were accelerated aged for 90 days by water needle electrode method, and PDC tests were conducted on the cables before and after ageing under constant temperature and humidity. The polarization and depolarization current of the cable samples were analyzed, and the conductivity and low frequency dielectric loss spectra were obtained and investigated. The results show that under the test temperature, the conductivity of the cables before and after ageing decreases slightly at 40 ℃ and then increases with temperature. According to the dielectric loss spectra, the polarization intensity of the unaged samples is low and their polarization loss changes little with temperature. The dielectric loss is mainly affected by the conductivity, so the test result is divided into two regions obviously. The polarization intensity of the water tree aged samples is high and affected by temperature obviously, so their low frequency dielectric loss increases at first and then decreases with the increase of temperature, and reaches the maximum value at 60 ℃.
作者
郭金明
覃秀君
李婧
GUO Jinming, QIN Xiujun, LI Jing(Electric Power Science Research Institute of Guangxi Power Grid Co., Ltd., Nanning 530023, China)
出处
《绝缘材料》
CAS
北大核心
2018年第10期57-61,66,共6页
Insulating Materials
关键词
XLPE电缆
水树
温度
极化去极化
电导率
低频介质损耗谱
XLPE cable
water tree
temperature
polarization and depolarization
conductivity
low-fre-quency dielectric loss spectrum
