Andersson Mattias G, Hynynen Jonna, Andersson Mats R, Englund Villgot, Hagstrand Per-Ola, Gkourmpis Thomas, Müller Christian
Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296, Göteborg, Sweden.
Future Industries Institute, University of South Australia, Mawson Lakes, South Australia 5095, Australia.
ACS Macro Lett. 2017 Feb 21;6(2):78-82. doi: 10.1021/acsmacrolett.6b00941. Epub 2017 Jan 11.
The insulation of state-of-the-art extruded high-voltage direct-current (HVDC) power cables is composed of cross-linked low-density polyethylene. Driven by the search for sustainable energy solutions, concepts that improve the ability to withstand high electrical fields and, ultimately, the power transmission efficiency are in high demand. The performance of a HVDC insulation material is limited by its residual electrical conductivity. Here, we demonstrate that the addition of small amounts of high-density polyethylene (HDPE) to a low-density polyethylene (LDPE) resin results in a drastic reduction in DC conductivity. An HDPE content as low as 1 wt % is found to introduce a small population of thicker crystalline lamellae, which are finely distributed throughout the material. The change in nanostructure correlates with a decrease in DC conductivity by approximately 1 order of magnitude to about 10 S m at high electric fields of 30 and 40 kV mm and elevated temperature of 70 °C. This work opens up an alternative design concept for the insulation of HVDC power cables.
最先进的挤出式高压直流（HVDC）电力电缆的绝缘层由交联低密度聚乙烯组成。在寻求可持续能源解决方案的推动下，提高承受高电场能力并最终提高输电效率的概念备受需求。高压直流绝缘材料的性能受其残余电导率的限制。在此，我们证明向低密度聚乙烯（LDPE）树脂中添加少量高密度聚乙烯（HDPE）会导致直流电导率大幅降低。发现低至1 wt%的HDPE含量会引入少量较厚的结晶片层，这些片层在整个材料中精细分布。纳米结构的变化与在30和40 kV/mm的高电场以及70°C的高温下直流电导率降低约1个数量级至约10 S/m相关。这项工作为高压直流电力电缆的绝缘开辟了一种替代设计概念。
