Space Charge Modelling in HVDC Extruded Cable Insulation
Space Charge Modelling in HVDC Extruded Cable Insulation
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DOI：
10.1109/tdei.2018.007413
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发表时间：
2019-02-01
影响因子：
3.1
通讯作者：
Hao, Miao
中科院分区：
文献类型：
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作者：
Zhan, Yunpeng;Chen, George;Hao, Miao
随着高压直流电缆技术的发展，聚合物绝缘层中空间电荷积累对高压直流电缆性能的影响越来越受到人们的关注，绝缘层上的电场分布也成为研究的重点。在本文中，一些修改已被应用于电缆的几何形状的双极电荷传输模型。在大量实验观察的基础上，引入了电荷注入的阈值电场。考虑到高压直流输电电缆的实际运行情况，特别考虑了热暂态对空间电荷行为的影响。一个不断变化的电流已被应用在MV尺寸电缆的核心，为了进一步研究的电荷动力学和预期的绝缘内的场分布。模拟结果表明，热瞬态可以影响注入电荷量和电荷的运动显着。场反转只在较高温度和较大温度梯度下发生，即使温度降低，场反转仍能维持。
With the growing interest in the development of HVDC cable technologies, the impact of space charge accumulation inside the polymeric insulation has attracted more attentions and the field distribution across the insulation has become the focus point of research. In this paper, several modifications have been applied on the bipolar charge transport model developed for the cable geometry. Based on many experimental observations, a threshold electric field at which the charge injection takes place was introduced. Considering the practical operation of HVDC cables, the thermal transient effects on space charge behaviors were particularly taken into account. A changing current flow has been applied in the core of a MV size cable, in order to further study the charge dynamics and to anticipate the field distribution within the insulation. The simulation results suggest that the thermal transient can affect the amount of injected charge and the charge movement significantly. The field inversion can only take place with higher temperature and larger temperature gradient, and this can be maintained even with temperature decreasing.