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Preparation and Dielectric Properties of SiC/LSR Nanocomposites for Insulation of High Voltage Direct Current Cable Accessories

Key Laboratory of Engineering Dielectric and its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150040, China
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Materials 2018, 11(3), 403; https://doi.org/10.3390/ma11030403
Received: 11 December 2017 / Revised: 1 March 2018 / Accepted: 7 March 2018 / Published: 8 March 2018
(This article belongs to the Section Advanced Nanomaterials and Nanotechnology)
The conductivity mismatch in the composite insulation of high voltage direct current (HVDC) cable accessories causes electric field distribution distortion and even insulation breakdown. Therefore, a liquid silicone rubber (LSR) filled with SiC nanoparticles is prepared for the insulation of cable accessories. The micro-morphology of the SiC/LSR nanocomposites is observed by scanning electron microscopy, and their trap parameters are characterized using thermal stimulated current (TSC) tests. Moreover, the dielectric properties of SiC/LSR nanocomposites with different SiC concentrations are tested. The results show that the 3 wt % SiC/LSR sample has the best nonlinear conductivity, more than one order of magnitude higher than that of pure LSR with improved temperature and nonlinear conductivity coefficients. The relative permittivity increased 0.2 and dielectric loss factor increased 0.003, while its breakdown strength decreased 5 kV/mm compared to those of pure LSR. Moreover, the TSC results indicate the introduction of SiC nanoparticles reduced the trap level and trap density. Furthermore, the SiC nanoparticles filling significantly increased the sensitivity of LSR to electric field stress and temperature changes, enhancing the conductivity and electric field distribution within the HVDC cable accessories, thus improving the reliability of the HVDC cable accessories. View Full-Text
Keywords: cable accessories; liquid silicone rubber; SiC/LSR nanocomposites; dielectric properties; electric field distribution; thermal stimulated current test cable accessories; liquid silicone rubber; SiC/LSR nanocomposites; dielectric properties; electric field distribution; thermal stimulated current test
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Shang, N.; Chen, Q.; Wei, X. Preparation and Dielectric Properties of SiC/LSR Nanocomposites for Insulation of High Voltage Direct Current Cable Accessories. Materials 2018, 11, 403.

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