用电磁波速诊断XLPE电缆绝缘  

Diagnosis of XLPE Cable Insulation Using Velocity of Electromagnetic Wave

作　　者：王黎明[1,2] 侯经洲[1,2] 陈昌龙[2] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084 [2]清华大学深圳研究生院,深圳518055

出　　处：《高电压技术》2011年第12期2984-2989,共6页High Voltage Engineering

摘　　要：XLPE电缆绝缘诊断的研究对于掌握电缆的绝缘老化状态,保证电力传输系统的安全可靠运行有着十分重要的意义。针对工程实际中大规模应用的诊断方法不多见的现状,提出了一种XLPE电缆状态检测的新方法,即用电磁波在一段XLPE电缆中的传播速度作为诊断这段电缆是否发生老化的依据。在阐明了该方法的原理和理论依据后介绍了所搭建的实验平台,按照提出的方法对两条不同绝缘老化状态的XLPE电缆进行了诊断测量并在测量数据的处理中确定了标定电磁波往返时间的有效方法。结果表明,用电磁波速进行XLPE电缆绝缘诊断可以很好的表征出两条XLPE电缆是否已发生了老化。最后,对测得的波形进行了说明,并通过将电磁波速的测量值与理论值进行对比,表明这一方法具有较高的准确性和可靠性,从而为XLPE电缆绝缘诊断提供新的思路。The research on diagnosis of XLPE power cable insulation is of a great importance for realizing the cable insulation aging status and ensuring the power transmission system in safe and reliable operation.Therefore,we put forward a new method,using electromagnetic wave propagation velocity in an XLPE cable as the criterion of whether the aging happens in the cable,set out the principles of the method and theoretical basis,and built a test platform.In accordance with the method proposed,we measured two different levels of water tree aged XLPE cables.During the measurement data processing,we also researched how to get the round-trip time effectively.The result indicates that using electromagnetic wave speed for diagnosis of XLPE cable insulation can reflect the insulation status of the two XLPE cables primly.Comparison of the different results suggests that this method is accurate and reliable,so as to provide new ideas for diagnosis of XLPE cable insulation.

关 键 词：XLPE电缆 绝缘诊断 信号检测 介电常数 水树枝 折反射 

分 类 号：TM247[一般工业技术—材料科学与工程]