Space Charge Accumulation Characteristics in HVDC Cable under Temperature Gradient

Yifan Zhou, Wei Wang and Tailong Guo
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Yifan Zhou: Beijing Key Laboratory of High Voltage & Electromagnetic Compatibility, North China Electric Power University, Beijing 102206, China
Wei Wang: Beijing Key Laboratory of High Voltage & Electromagnetic Compatibility, North China Electric Power University, Beijing 102206, China
Tailong Guo: Beijing Key Laboratory of High Voltage & Electromagnetic Compatibility, North China Electric Power University, Beijing 102206, China

Energies, 2020, vol. 13, issue 21, 1-17

Abstract: One of the main issues that affect the development of high-voltage direct-current (HVDC) cable insulation is the accumulation of space charge. The load operation of an HVDC cable leads to the formation of a radially distributed temperature gradient (TG) across the insulation. In this study, the space charge accumulation in a cross-linked polyethylene (XLPE) cable is measured under a DC electric field and TG using the pulsed electro-acoustic (PEA) method, and the effect of the TG on the space charge behavior is investigated. In addition, the bipolar charge transport (BCT) model and the conductivity model based on an improved cylindrical geometry are used to simulate the charge behavior in the HVDC XLPE cable under TG, and the experimental and simulated results are compared. The results show that the higher temperature of the cable conductor promotes the accumulation of homocharge near the side of high temperature. Additionally, with the increase of the TG, not only does more heterocharge accumulates adjacent to the side of low temperature, but more space charge also extends into the bulk of the cable insulation. More attention should be paid to the conductor shield layer and the insulation shield layer in HVDC cables. Moreover, the BCT model can more accurately describe the experimental results than the conductivity model.

Keywords: HVDC cable; space charge; pulsed electro-acoustic (PEA); temperature gradient (TG); cross-linked polyethylene (XLPE); conductivity model; bipolar charge transport (BCT) model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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