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Investigation on Crystalline Morphology and Tree Discharge Characteristic of PE/MMT Nanocomposites

Author: ZhangJinMei
Tutor: ZhangXiaoHong
School: Harbin University of Science and Technology
Course: High Voltage and Insulation Technology
Keywords: Polyethylene / Montmorillonite Nanocomposites Dendronized Partial discharge Thermally Stimulated Current
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 113
Quote: 3
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Abstract


Polyethylene molecular structure symmetrical, having no polar group , and has good electrical insulation performance , is one of the most widely used plastic in the field of application of the electrically insulating , but long term at a high electric field under the action of electrical trees prone to cause insulation aging . In order to improve the performance of polyethylene resistant electrical treeing , scholars from various countries to study a variety of polyethylene modified method , this article uses 2:1 lamellar structure of montmorillonite modified polyethylene . In this paper, the melt intercalation method take polyethylene / montmorillonite composites . Polyethylene crystal morphology observed by polarized light microscopy , atomic force microscope polyethylene / montmorillonite composite microstructure characterization results showed that the materials prepared for the nanocomposites . Joint measuring device changes for the comparative study of polyethylene and polyethylene / Montmorillonite Nanocomposites treeing resistance performance and electrical tree growth process of partial discharge signal using a digital camera and partial discharge detection . Experimental results show that under the same conditions , compared with polyethylene , polyethylene / montmorillonite nano composites initiator electrical trees dispersibility ; the electrical tree shape plexiform ; voltage application when 360min branches short length ; electrical tree the fractal dimension in the growth process ; small amount of partial discharge , discharge sparse , and discharge extinguished the phenomenon exists . These results indicate that Polyethylene / Montmorillonite Nanocomposites effectively inhibit electrical tree growth , improved polyethylene resistant to electrical tree performance . Also studied the voltage grade of polyethylene and polyethylene / montmorillonite nanocomposites triggered electrical tree , results showed impose higher the voltage level of electrical tree growth in the two materials faster , but the shape of the electrical tree the different changes . In order to further investigate the mechanism of resistance dendronized Polyethylene / Montmorillonite Nanocomposites , polyethylene and polyethylene / montmorillonite nanocomposite materials Thermally Stimulated Current Spectrum and energy level of measurement . The results show : compared with polyethylene , polyethylene / montmorillonite nanocomposites deep trap levels in the shallow trap level to the level density and smaller level density , and therefore can be modulated carrier concentration and migration rate, reduce the formation of the hot electrons , so as to effectively inhibit the growth of electrical trees .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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