High voltage direct current (HVDC) power transmission cable is critical for realising sustainability through renewable energy revolution. Eco-friendly thermoplastic polypropylene (PP)-based polymers/nanocomposites are regarded as promising candidates for replacing current thermoset crosslinked polyethylene (XLPE) cables. As an essential component of the extruded HVDC cable for improving conductor/insulation interface and suppressing charge injection to insulation at high DC electrical stresses, developing semiconducting (SC) screens that are compatible with PP-based insulation is of similar importance but has not been well studied yet. This work aims at designing PP-based semiconducting screens and investigating space charge behaviours of SC/PP/SC sandwich specimen to unfold the effect of semiconducting materials, bonding methods, applied DC electric field, and temperature on charge injection, accumulation, transportation, and dissipation in PP-based insulation. Although conventional thermal, mechanical, and low field electrical characterisations demonstrated that all of the developed semiconducting materials meet the performance criteria of commercial semiconducting materials, their space charge and local electric field distribution varied significantly at high DC fields. Compared with the traditional non-bonded configuration used at lab-scale, charge injection was enhanced in hot-pressed SC/PP/SC samples with tightly bonded interfaces, which better reflects the real situation in extruded cables. High temperature further intensified charge injections. Besides, our results also revealed that high temperature and electric field strongly influence charge mobilities and consequently their distribution and local electric field in PP-based insulations.

中文翻译：

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半导体屏蔽对高压直流电缆聚丙烯基聚合物空间电荷行为影响的研究

高压直流 (HVDC) 输电电缆对于通过可再生能源革命实现可持续性至关重要。基于环保热塑性聚丙烯 (PP) 的聚合物/纳米复合材料被认为是替代当前热固性交联聚乙烯 (XLPE) 电缆的有希望的候选者。作为挤出 HVDC 电缆的重要组成部分，用于改善导体/绝缘界面并在高直流电应力下抑制电荷注入绝缘，开发与 PP 绝缘兼容的半导体 (SC) 屏幕具有类似的重要性，但效果不佳学习了。本工作旨在设计基于 PP 的半导体屏幕并研究 SC/PP/SC 夹层样品的空间电荷行为，以展示半导体材料、键合方法、施加直流电场和温度对 PP 绝缘中电荷注入、积累、传输和耗散的影响。尽管传统的热、机械和低场电特性表明所有开发的半导体材料都符合商业半导体材料的性能标准，但它们的空间电荷和局部电场分布在高直流场下变化很大。与实验室规模使用的传统非粘合配置相比，具有紧密粘合界面的热压 SC/PP/SC 样品增强了电荷注入，更好地反映了挤出电缆的真实情况。高温进一步加强了电荷注入。除了，