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Controlling Factors of Degassing in Crosslinked Polyethylene Insulated Cables

1
King Abdullah University of Science and Technology, Thuwal 26955, Saudi Arabia
2
Dow Middle East Innovation Center, Dow Material Science, Thuwal 26955, Saudi Arabia
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Dow Chemical (China) Investment Co., Ltd., Shanghai 201203, China
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Authors to whom correspondence should be addressed.
Polymers 2019, 11(9), 1439; https://doi.org/10.3390/polym11091439
Received: 20 July 2019 / Revised: 26 August 2019 / Accepted: 30 August 2019 / Published: 2 September 2019
Here, we analyze the degassing process of a byproduct (methane) formed during the peroxide-induced crosslinking of polyethylene. A diffusion model based on Fick’s law is used to obtain the controlling factors of degassing in a crosslinked polyethylene (XLPE) insulated power cable (132 kV with 18 mm of insulation). We quantitatively analyze different scenarios of the diffusion of methane through the XLPE insulation and two semiconductor layers under various in situ degassing conditions. The analyzed degassing conditions include heat transfer and its effect on the diffusion properties, the different transport and boundary conditions due to the free spaces within the cable conductor, and the nonuniform distribution of methane concentrations within the insulation layers. Our simulation results clearly demonstrate that the free spaces between the copper strands in the cable conductor significantly affect the degassing efficiency. However, the temperature-diffusion coupling has a relatively minor effect on the overall degassing efficiency due to the rapid temperature increase of the polymer layers during the initial stages of degassing. Moreover, we find that the nonuniform distribution of methane in the initial stages also plays an important role in degassing in the cable, but this effect varies significantly during the degassing process. View Full-Text
Keywords: crosslinked polyethylene (XLPE) insulation; methane degassing; Fick’s law of diffusion; temperature-dependent diffusion; cable conductor; nonuniform concentration crosslinked polyethylene (XLPE) insulation; methane degassing; Fick’s law of diffusion; temperature-dependent diffusion; cable conductor; nonuniform concentration
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MDPI and ACS Style

Youn, D.J.; Li, J.; Livazovic, S.; Sun, Y.; Sun, S. Controlling Factors of Degassing in Crosslinked Polyethylene Insulated Cables. Polymers 2019, 11, 1439.

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