深阱密度和注入势垒高度对介电体内部空间电荷积累的影响

Imran Daniel Salim, N. H. Nik Ali, A. M. Ariffin, Atip Doolgindachbaporn, T. M. Kuan, Mohd Abdul Talib Mat Yusoh
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引用次数: 0

摘要

十多年来,绝缘技术经历了许多发展,为高压直流(HVDC)设备提供更好的保护。高压直流输电系统一直被电力行业视为高压交流电(HVAC)上远距离大容量输电的介质。各种类型的材料已被用于绝缘高压直流设备。然而,对影响高压直流系统性能的主要问题之一——空间电荷积累性质的认识不足,给行业带来了挑战。对于工业来说,制造出完美的绝缘材料是不切实际的,这种绝缘材料可以承受任何因化学性能差而导致的故障。绝缘龄期或绝缘形态内存在的杂质会影响空间电荷的积累,从而导致绝缘材料中的电场畸变。恒定的电场畸变会加速绝缘材料本身的老化过程。为了提高绝缘性能,研究不同深阱密度和注入势垒高度参数对空间电荷行为的影响十分重要。本文将通过使用低密度聚乙烯(LDPE)和交联聚乙烯(XLPE)的双极电荷传输(BCT)模型对空间电荷行为进行研究,这两种材料都是高压直流电缆常用的聚合物绝缘材料。本文在电荷密度和电场的基础上,研究了深阱密度和注入势垒高度的不同参数对空间电荷行为的影响。在LDPE和XLPE中,深阱密度和注入势垒高度影响空间电荷的积累。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of Deep Trap Density and Injection Barrier Height towards Accumulation of Space Charge within Dielectrics
Over a decade, insulation technologies have undergone numerous developments to provide better protection for high-voltage direct current (HVDC) equipment. HVDC system has been regarded by the power industry as a medium for long-distance bulk transmission over high voltage alternating current (HVAC). Various types of materials have been used to insulate the HVDC equipment. However, the lack of knowledge about the nature of space charge accumulation which is one of the major problems with HVDC system performance has brought challenges to the industry. It is impractical for the industry to manufacture perfect insulation that could sustain any cause of breakdown due to poor chemical properties. The insulation age or impurities existing within the insulation morphology can influence the accumulation of space charge, thus leading to distortion of an electric field in the insulation material. The constant electric field distortion can accelerate the ageing process of the insulation material itself. To improve the insulation performance, it is important to study the influence of different deep trap densities and the injection barrier height parameters on the behaviour of space charge. This paper will focus on the investigation of space charge behaviour by using a bipolar charge transport (BCT) model on low-density polyethylene (LDPE) and cross-linked polyethylene (XLPE), which both are common polymeric insulations for HVDC cable. In this paper, the effect of different parameters of both deep trap density and injection barrier height on space charge behaviour will be studied based on the charge density and electric field. It has been observed that the deep trap density and injection barrier height affect the accumulation of space charge in the LDPE and XLPE.
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