Application Status and Research Prospects of HVDC Extruded Cables

doi:10.11930/j.issn.1004-9649.202006273

Abstract

Abstract: HVDC extruded cable is one of the key facilities for long-distance and large-capacity power transmission lines. The currently widely used DC extruded cable is mostly insulated with crosslinked polyethylene (XLPE). An investigation is conducted on the HVDC XLPE insulated cable in terms of space charge and byproducts degassing. It is concluded that the ultra-pure XLPE material is currently the most feasible way to mitigate the space charge problem and manufacture extruded HVDC cable for large batches. The research on byproducts degassing problem should be based on the testing results of mini-samples to guide the degassing process for long distance and batch production of cables. Based on the extruded HVDC cable projects which have been put into operation or are under design both in China and abroad, it is proposed that future development of DC extruded cables should focus on improving the electrical insulation level of the insulation materials with a higher the operating voltage. Meanwhile, the allowable operation temperature of cables should be elevated to realize a larger transmission capacity. Besides, from the perspective of improving productive efficiency and recycling, it is suggested that the research on application of thermoplasticity insulation material in extruded HVDC cables should be enhanced.

Key words: HVDC extruded cable, space charge, byproduct degassing, allowable operation temperature, thermoplasticity insulation material

HU Ming, LIU Shujun, YANG Jianjun, XIE Shuhong, ZHANG Hongliang, YAN Zhiyu. Application Status and Research Prospects of HVDC Extruded Cables[J]. Electric Power, 2021, 54(4): 42-55.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202006273

https://www.electricpower.com.cn/EN/Y2021/V54/I4/42

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