Effects of Pre-Crosslinking on Space Charge and Breakdown Characteristics of XLPE Cable Insulation

Zhenpeng Zhang, You Wu, Chao Fu, Shaoxin Meng, Chao Peng, Zhonglei Li and Boxue Du
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Zhenpeng Zhang: State Key Laboratory of Power Grid Environmental Protection, Wuhan 430073, China
You Wu: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Chao Fu: China Electric Power Research Institute, Wuhan 430073, China
Shaoxin Meng: State Key Laboratory of Power Grid Environmental Protection, Wuhan 430073, China
Chao Peng: China Electric Power Research Institute, Wuhan 430073, China
Zhonglei Li: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
Boxue Du: Key Laboratory of Smart Grid of Education Ministry, School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China

Energies, 2022, vol. 15, issue 7, 1-13

Abstract: This study focused on the effect of pre-crosslinking on the electrical properties of XLPE insulation for HVDC cables. The XLPE samples were pre-crosslinked at 140, 150 and 160 °C. The space charge and DC breakdown characteristics of the XLPE samples with and without pre-crosslinking were investigated. The results show that the pre-crosslinked XLPE samples have an obvious space charge injection and transportation, resulting in more severe electric field distortion. Under the electric field of 100 kV/mm, the electric field distortion rates of the XLPE samples pre-crosslinked at 150 and 160 °C reached 51% and 72% respectively, which were much higher than that of the XLPE sample without pre-crosslinking (14%.) Compared with the XLPE without pre-crosslinking, the breakdown strengths of XLPE pre-crosslinked at 140, 150 and 160 °C were reduced by 11%, 6% and 7% respectively, at the temperature of 50 °C. It is concluded that the pre-crosslinking leads to imperfect crystallization and micro-defects in the amorphous region of XLPE, thereby leading to more space charge accumulation and reduced DC breakdown. The pre-crosslinking of XLPE insulation therefore should be prevented during HVDC cable manufacturing.

Keywords: HVDC cable; XLPE insulation; space charge; breakdown strength (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: 2022
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