Numerical Simulation of Interface Charge Behaviors Between LDPE/EPDM for HVDC Cable Accessory Insulation Based on the Bipolar Charge Transport Model

被引：0
|
作者：
Li J. [1 ]
Liang H. [1 ]
Du B. [1 ]
Song P. [2 ]
Kong X. [1 ]
Li Z. [1 ]
机构：
[1] Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin
[2] Electric Power Research Institute, State Grid Tianjin Electric Power Company, Tianjin
来源：
Du, Boxue (duboxue@tju.edu.cn) | 2018年 / Science Press卷 / 44期
基金：
中国国家自然科学基金;
关键词：
Bipolar charge transport model; Carrier mobility; Electrical field distribution; HVDC cable accessory; Interface barrier; Interface charge; Surface state;
D O I：
10.13336/j.1003-6520.hve.20180430007
中图分类号：
学科分类号：
摘要：
HVDC extruded cable is the key equipment of flexible DC transmission technology. However, the interface charge between different dielectrics is easy to accumulate in the HVDC cable accessories due to the discontinuity of conductivity and permittivity, which will threaten the safety of the HVDC cable system. So, the injection and transportation behaviors of space charge in ethylene propylene diene monomer (EPDM)/low-density polyethylene (LDPE) bi-layer dielectrics were simulated by using a bipolar charge transport model with different interface characteristics including the surface states, interface barrier and carrier mobility. Furthermore, the influence of interface charge accumulation on the electrical field distribution in HVDC cable accessory was analyzed. The simulation and test results show that the interface charge density in HVDC cable accessory is increased by the deep surface trap energy level, high interface barrier and large carrier mobility difference. The accumulation of interface charge makes the electrical field distribution more distorted. Therefore, interface charge accumulation in the HVDC cable accessory can be suppressed by improving the surface state distribution and matching degree of carrier mobilities and decreasing the interface barrier. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：1443 / 1449
页数：6
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