高压退役电缆空间电荷特性

发布时间：2018-04-16 01:03

本文选题：kV + XLPE电缆　；参考：《高电压技术》2016年11期

【摘要】：由电缆老化引起的绝缘层空间电荷的积累与消散对于电缆绝缘性能有很大影响。选择2根退役及1根备用110 kV交联聚乙烯电缆,利用电声脉冲法测量了不同位置的空间电荷分布,初步分析了空间电荷特性与电缆老化之间的关系。结果表明:老化后的试样不同位置的正极性电荷和异极性电荷(不包含正极性电荷)均增加;极化阶段平均体电荷密度差异很小,无法判断电缆老化状况;去极化起始阶段,电荷脱陷使得平均体电荷密度跃变,不同电缆样品不同层的初始值差异较大;随着时间增加,电荷消散速度逐渐减小,很好的反应了绝缘层陷阱能级的变化。总的来说,电荷消散过程中平均体电荷密度的变化及陷阱能级差异更能反应电缆老化状况。
[Abstract]:The accumulation and dissipation of space charge of insulation layer caused by cable aging have great influence on the insulation performance of cable.Two retired and one standby 110kV XLPE cable were selected to measure the space charge distribution in different positions by electroacoustic pulse method. The relationship between space charge characteristics and cable aging was preliminarily analyzed.The results show that the positive charge and the heteropolar charge (excluding the positive charge) of the aged sample at different positions are increased, the difference of average bulk charge density in the polarization phase is very small, it is impossible to judge the aging condition of the cable, and the initial stage of depolarization,Charge detrapping makes the average bulk charge density jump, and the initial values of different layers of different cable samples differ greatly. With the increase of time, the velocity of charge dissipation decreases gradually, which well reflects the change of trap energy level in insulation layer.In general, the variation of average bulk charge density and the difference of trap energy levels in the process of charge dissipation can better reflect the aging of the cable.
【作者单位】：华南理工大学电力学院;
【基金】：国家高技术研究发展计划(863计划)(2015AA050201)~~
【分类号】：TM247

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