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Materials 2019, 12(8), 1234; https://doi.org/10.3390/ma12081234

Enhanced High-Temperature DC Dielectric Performance of Crosslinked Polyethylene with a Polystyrene Pinning Structure

1
State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
2
School of Electronics and Computer Science, University of Southampton, Southampton SO16 1BJ, UK
*
Authors to whom correspondence should be addressed.
Received: 4 March 2019 / Revised: 5 April 2019 / Accepted: 12 April 2019 / Published: 15 April 2019
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Abstract

In this paper, we propose a method on improving direct current (DC) dielectric performance by designing a polystyrene (PS) pinning crosslinked polyethylene (XLPE) for the application of insulation materials on high voltage direct current (HVDC) extruded cable. Electrical experimental results show that the addition of PS (1–5 phr, parts per hundreds of resin) can significantly reduce DC conductivity and increase DC breakdown strength of XLPE in the test temperature range of 30–90 °C. Microstructure investigation shows PS distributed as particles could participate in the formation of a crosslinking network with the help of a crosslinking agent, thus forming a polymer pinning structure at the interface between XLPE and PS. It is believed that such a special design strengthens the structure of XLPE, which leads to the improved DC dielectric performance at elevated temperatures. Our findings may contribute a new solution for developing HVDC cable insulation materials. View Full-Text
Keywords: DC dielectric performance; crosslinked polyethylene; polystyrene; pinning structure DC dielectric performance; crosslinked polyethylene; polystyrene; pinning structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cao, L.; Zhong, L.; Li, Y.; Zhang, K.; Gao, J.; Chen, G. Enhanced High-Temperature DC Dielectric Performance of Crosslinked Polyethylene with a Polystyrene Pinning Structure. Materials 2019, 12, 1234.

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