振动载荷条件下的交联聚乙烯绝缘老化特性试验研究  

Experimental Study on Aging Characteristics of XLPE Insulation Under Vibration Loads

作　　者：张振鹏[1,2,3] 蒙绍新[1,2,3] 夏荣[2,3] 赵健康[2,3] 舒乃秋[1] 刘骥[4] 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]中国电力科学研究院,武汉430074 [3]电网环境保护国家重点实验室,武汉430074 [4]哈尔滨理工大学,哈尔滨150080

出　　处：《高电压技术》2016年第8期2399-2405,共7页High Voltage Engineering

摘　　要：为分析振动载荷对交联聚乙烯（XLPE）绝缘电缆的绝缘状态和运行可靠性的影响,评估热老化过程中施加振动载荷后XLPE绝缘材料微观结构及性能的变化,将2组XLPE试样分别放在恒温箱和恒温-振动箱内进行老化试验,其中在恒温-振动箱内的XLPE试样同时承受温度和振动载荷的作用。将2种老化方式下的XLPE试样在不同老化时间点的微观结构、机械性能、介电性能、热过程、耐电性能等进行比对测试。研究结果表明：在相同的老化时间下,施加振动载荷作用的XLPE试样的微观结构、机械性能、介电性能、耐电性能明显区别于的未施加振动载荷作用的XLPE试样;且存在一个老化时间限值（900~1 200 h）,超过这个限制后施加振动载荷作用的XLPE试样的性能明显劣于未施加振动载荷的试样,充分证明了振动载荷对XLPE绝缘老化的加速特性。In order to analyze the insulation state and operating reliability of the XLPE cable line under vibration load, and to evaluate the changes of the microstructure and properties of the XLPE insulation material, in the process of its thermal aging after applying vibration loads, aging test were conducted on two groups of XLPE samples, which were in the constant temperature and temperature-vibration boxes respectively. In the temperature-vibration box, the XLPE sampies were endured the effect of heat and mechanical vibration. The micro structure, mechanical properties, dielectric properties, thermal process, resistance to electrical properties at different aging time point of the XLPE samples under two aging conditions were compared and tested. The results show that： the micro structure, mechanical properties, dielectric properties, resistance to electrical properties of XLPE samples in the constant temperature and temperature-vibration boxes were obvious different from that of XLPE samples in the constant temperatures under the same aging time temperature aging; and there exists a certain aging time limit, when exceeding this limit, the properties of XLPE samples applied with vibration loads were inferior to that of samples without vibration loads, which has fully proved the accelerate cha- racteristics of the vibration loads for the aging of XLPE insulation.

关 键 词：电力电缆 振动载荷 老化 XLPE绝缘 微观结构 介电性能 

分 类 号：TM75[电气工程—电力系统及自动化]