Effect of nonlinear conductivity on dynamic process of space charge in HVDC cable insulation

被引：0
|
作者：
Sun Y.-L. [1 ]
Li Z.-H. [1 ]
Suo C.-Y. [1 ]
机构：
[1] Key Laboratory of Engineering Dielectrics and Its Application, College of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin
来源：
Dianji yu Kongzhi Xuebao/Electric Machines and Control | 2019年 / 23卷 / 07期
关键词：
Dynamic process; HVDC cable; Non-linear conductivity; Polarization; Space charge;
D O I：
10.15938/j.emc.2019.07.004
中图分类号：
学科分类号：
摘要：
In order to research the space charge problems caused by nonlinear conductivity in HVDC cable insulation, the finite elements method was adopted to study the effect of non-linear conductivity attributes on dynamic process of space charge polarization and depolarization in HVDC cable insulation. The space charge density patterns during polarization and depolarization over time were attained while changing the conductivity activation energy and the field-dependent coefficient. The results show that reducing the conductivity activation energy or increasing the field-dependent coefficient diminishes the space charge amount and the "overshoot" during polarization and depolarization which are all induced by nonlinear conductivity and also makes the polarization and depolarization reach the steady more quickly. But meanwhile that increases the current density in cable insulation. © 2019, Harbin University of Science and Technology Publication. All right reserved.
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页码：27 / 37
页数：10
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