电缆绕组变压器外半导电层中的电流特性  

Property of Current in Outer Semiconducting Layer of Cable Winding Transformer

作　　者：吕亮[1] 雷琅[2] 张晋[2] 郭磊[1] 李彦明[2] 

机构地区：[1]陕西电力科学研究院,西安710054 [2]西安交通大学电气工程学院,西安710049

出　　处：《电工技术学报》2009年第5期40-45,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50277028)

摘　　要：电缆绕组变压器的线圈所用的电缆为去掉外金属护套的电缆,当绕组芯线上存在高频电压时,在其外半导电层上会产生相同频率电压与电流。为了研究外半导电层内的电流大小与芯线内电压、电流等参量之间的关系,首先利用有限元法对外半导电层中的涡流电流进行计算,然后对绕组外半导电层的等效电路进行了研究,最后通过与实验相比较的方法,分析了电缆绕组变压器外半导电层中电流产生的原因,并研究了半导电层材料的电阻率对其内部电流幅值的影响。When voltage with high frequency is applied to the core of winding, voltage and current with same frequency will occur in the outer semiconducting layer, as there is no copper outer shield in the XLPE cable of the winding. To study the relations between current in the outer semiconducting layer and voltage and current in the core, finite element method is used to calculate the eddy current in the outer semiconducting layer firstly, and then a circuit model of it is studied. By comparing with measurements, it is found that the current flowing in it is from coupling between core and semiconducting layer. And in this paper, the effect of resistivity of semiconducting layer on the amplitude of current in it is studied.

关 键 词：电力变压器 交联聚乙烯电缆 绕组 暂态 半导电层 电容耦合 

分 类 号：TM41[电气工程—电器]