摘要
挤塑型交联聚乙烯(XLPE)高压直流电缆绝缘中空间电荷的积聚会造成局部场强畸变,导致材料的绝缘性能下降。电缆内导体的热效应在绝缘层产生的温度梯度会进一步影响电荷行为,纳米颗粒改性是抑制空间电荷的一种有效措施,但抑制作用具体如何实现,尤其是对于微观层面载流子输运过程的影响规律还需深入分析。试样内空间电荷的数值仿真可以探究各种微观粒子之间的相互作用和演化过程,因此文中基于载流子抽出受限的双极性电荷输运模型,对温度梯度下的电荷行为,深陷阱与浅陷阱对于载流子迁移过程的影响进行了研究。结果表明:低温侧会因抽出受限而积聚异极性电荷,深陷阱会限制载流子输运且深陷阱作用存在瓶颈,随着迁移率增大,电荷分布由同极性变为异极性分布,当迁移率足够大时,异极性电荷不再增长甚至开始降低。
The accumulation of space charge in the insulation of extruded cross-linked polyethylene(XLPE)high voltage DC cable will cause local field strength distortion and reduce the insulation performance of the material.The temperature gradient generated by the thermal effect of the conductor in the cable in the insulating layer will further affect the charge behavior.The modification of nanoparticles is an effective measure to suppress the space charge,whereas,how to realize the inhibition,especially for the carrier transport process at the micro level,needs to be deeply analyzed.The numerical simulation of space charge in the sample can explore the interaction and evolution process between various micro particles.Based on the bipolar charge transport model with limited carrier extraction,this paper studies the charge behavior under temperature gradient and the effects of deep traps and shallow traps on the carrier migration process.The results show that the low temperature side will accumulate heteropolar charges due to limited extraction,deep traps will limit carrier transport,and there is a bottleneck in the role of deep traps.With the increase of mobility,the charge distribution changes from homopolar to heteropolar.When the mobility is large enough,the heteropolar charge will not increase or even begin to decrease.
作者
陈驰
李佳兴
王霞
吴锴
王闯
王德意
CHEN Chi;LI Jiaxing;WANG Xia;WU Kai;WANG Chuang;WANG Deyi(School of Electrical Engineering,Xi’an University of Technology,Xi’an 710048,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第1期311-320,共10页
High Voltage Engineering
基金
国家自然科学基金(51707155)。
