Investigation of the electrical properties of XLPE/SiC nanocomposites |
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| Affiliation: | 1. Faculty of Polymer Engineering and Color Technology, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran;2. Loghman Fundamental/Technological Research Group, P.O. Box 15875-4413, Tehran, Iran;1. Institute of Thermal Power Engineering, Cracow University of Technology, al. Jana Pawła II 37, 31-864 Kraków, Poland;2. Department of Agricultural Sciences, University of Bologna, VialeFanin 44, 40125 Bologna, Italy;3. Division of Soil Hydrology, Georg August University of Göttingen, Büsgenweg 2, 37077 Göttingen, Germany;4. Institute of Thermal Engineering and Air Protection, Cracow University of Technology, ul. Warszawska 24, 31-155 Kraków, Poland;5. SardarVallabhbhai National Institute of Technology (SV NIT) Ichchanath, Surat 395 007, Gujarat State, India;6. Dept. of Astronautical, Electrical and Energetic Engineering, Sapienza University of Rome, Via Eudossiana, 18 00184 Rome, Italy;1. School of Civil Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China;2. Anhui International Joint Research Centre on Hydrogen Safety, Hefei, 230009, China;3. State Grid Anhui Electric Power Research Institute, Hefei, 230601, China |
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| Abstract: | The interface between nanoparticles and the polymer matrix, which dominates the electrical properties of nanocomposites, can effectively improve the DC breakdown and suppress space charge accumulation in nanocomposites. To research the interface characteristics, XLPE/SiC nanocomposites with concentrations of 1 wt%, 3 wt% and 5 wt% were prepared. The DC breakdown, dielectric properties and space charge behavior were examined using pulsed electro-acoustic (PEA) equipment and a dielectric analyzer. The test results show that the nanocomposites with concentrations of 1 wt% and 3 wt% have higher DC breakdown field strength than neat XLPE. In contrast, there is a lower DC breakdown strength at a concentration of 5 wt%, possibly due to the agglomeration of nanoparticles. Nanoparticle doping increases the real and imaginary permittivities over those of neat XLPE. Furthermore, with increasing concentration, a larger increase in the permittivity amplitude was observed. Based on the space charge behavior, all nanocomposites could suppress space charge accumulation, but the nanocomposite with a concentration of 1 wt% exhibited the best effect. Meanwhile, heterocharge accumulation near electrodes was observed in neat XLPE and the nanocomposite with a concentration of 5 wt%. In contrast, homocharge accumulation near electrodes was observed in the nanocomposite with a concentration of 3 wt%. This phenomenon may be due to different amounts of shallow traps in nanocomposites with different concentrations, which might lead to differing electron or hole mobility. |
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| Keywords: | XLPE/SiC nanocomposites Electrical properties Interface Mobility |
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