电缆运行老化过程对其空间电荷行为的影响
发布时间：2019-03-07 22:10
【摘要】：高压电缆长期运行会使得绝缘层逐渐老化,在外加电场下内部空间电荷的行为也会发生很大变化。为研究此变化,基于脉冲电声(PEA)法测试了不同运行年限电缆绝缘层的空间电荷分布,探究了电缆运行老化对绝缘层空间电荷特性变化的影响。结果表明:在极化阶段,老化试样的电荷注入饱和所需时间更长,阳极内侧和试样内部均会积累负极性电荷;不同试样的电荷积累曲线差异较小,电荷注入饱和后的电荷量几乎无差异;在去极化阶段,老化试样的正极性电荷消散变慢,负极性电荷消散变快;老化越严重则初始电荷量越大,与极化阶段末端时刻电荷的比率也越大,电荷消散曲线反映出的陷阱能级也加深。分析可知,异极性电荷积累,去极化阶段初始时刻电荷跃变及陷阱最大能级深度,都很好地反映了不同运行年限电缆绝缘层空间电荷的差异。
[Abstract]:Long-term operation of high-voltage cable will make insulation layer aging, and the behavior of internal space charge will change greatly under applied electric field. In order to study this change, the space charge distribution of cable insulation layer was measured by pulse electro-acoustic (PEA) method, and the influence of cable aging on the change of space charge characteristic of insulation layer was investigated. The results show that in the polarization stage, the time required for the charge injection saturation of the aging sample is longer, and the negative polar charge will be accumulated both inside the anode and inside the sample. There is little difference in charge accumulation curve among different samples, and there is almost no difference in charge amount after saturation of charge injection, and in the stage of depolarization, the positive and negative charge dissipation of aging sample becomes slow and negative charge dissipates quickly. The more serious the aging, the larger the initial charge amount and the ratio of the charge at the end of the polarization stage to the time charge, and the trap level reflected by the charge dissipation curve is also deepened. The analysis shows that the heteropolar charge accumulation, charge jump at the initial time of depolarization and the maximum energy level depth of the trap well reflect the difference of space charge in cable insulation layer with different operating years.
【作者单位】： 华南理工大学电力学院;中国南方电网有限责任公司广州供电局有限公司输电管理所;
【基金】：国家高技术研究发展计划(863计划)(2015AA050201)~~
【分类号】：TM247;TM75
，
本文编号：2436498
[Abstract]:Long-term operation of high-voltage cable will make insulation layer aging, and the behavior of internal space charge will change greatly under applied electric field. In order to study this change, the space charge distribution of cable insulation layer was measured by pulse electro-acoustic (PEA) method, and the influence of cable aging on the change of space charge characteristic of insulation layer was investigated. The results show that in the polarization stage, the time required for the charge injection saturation of the aging sample is longer, and the negative polar charge will be accumulated both inside the anode and inside the sample. There is little difference in charge accumulation curve among different samples, and there is almost no difference in charge amount after saturation of charge injection, and in the stage of depolarization, the positive and negative charge dissipation of aging sample becomes slow and negative charge dissipates quickly. The more serious the aging, the larger the initial charge amount and the ratio of the charge at the end of the polarization stage to the time charge, and the trap level reflected by the charge dissipation curve is also deepened. The analysis shows that the heteropolar charge accumulation, charge jump at the initial time of depolarization and the maximum energy level depth of the trap well reflect the difference of space charge in cable insulation layer with different operating years.
【作者单位】： 华南理工大学电力学院;中国南方电网有限责任公司广州供电局有限公司输电管理所;
【基金】：国家高技术研究发展计划(863计划)(2015AA050201)~~
【分类号】：TM247;TM75
，
本文编号：2436498
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