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硅橡胶复合材料电气性能探究
发布时间:2019-03-22
  

  
  电气工程硕士亚博电竞官方登录链接第二篇:硅橡胶复合材料电气性能探究
  
  本篇文章目录导航:
 
  【题目】硅橡胶复合材料电气性能探究  
  【第一章】硅橡胶纳米材料电气老化情况研究绪论  
  【第二章】硅橡胶基纳米复合材料的制备与电老化实验方法  
  【第三章】电老化对硅橡胶复合材料电导率和击穿特性的影响  
  【第四章】电老化对硅橡胶基纳米复合材料空间电荷特性的影响  
  【结论-参考文献】硅橡胶合成材料电化性能探析结论与参考文献

  
  摘要
  
  在直流电缆系统中,附件稳态运行时,绝缘结构中场强分布与材料体积电导率成反比,在XLPE绝缘高压直流电缆终端中,硅橡胶增强绝缘的电导率小于电缆XLPE绝缘,以普通硅橡胶为增强绝缘的高压直流电缆终端中的高电场强度区域位于硅橡胶增强绝缘内,通常情况下高压直流电缆XLPE绝缘的击穿强度远大于硅橡胶绝缘,因而以普通硅橡胶为增强绝缘的XLPE绝缘高压直流电缆终端内的电场分布不合理,目前已有研究表明,采用具有非线性电导特性的增强绝缘材料可以很好的解决这一问题。由于电缆长期运行在高压直流电场下导致绝缘材料整体绝缘强度降低,极易引起附件绝缘被击穿,进而降低高压直流电缆运行的稳定性,危及整个输电系统的正常供电。所以,绝缘材料的耐电老化能力是决定电缆附件整体绝缘能力的一个重要因素。
  
  本文以固体硅橡胶为基体,纳米石墨和纳米炭黑为填料制成具有非线性电导特性的硅橡胶纳米复合材料,并以该材料和纯硅橡胶为对象进行电老化实验,分别测试了未老化和老化时间为720h、1440h及2160h后纯硅橡胶与硅橡胶纳米复合材料的电导特性、直流击穿特性和空间电荷特性,分析不同老化时间后纯硅橡胶和硅橡胶纳米复合材料电气性能的变化,并进行比较。
  
  研究结果表明:在电老化过程中,硅橡胶纳米复合材料与纯硅橡胶经过相同的老化时间作用后,两种材料在30℃、50℃和70℃测试温度下电导率均随老化时间的增加而呈上升的趋势,增长程度相近,并且随着测试温度的增加,硅橡胶纳米复合材料与纯硅橡胶的电导率均增大。两种材料在30℃、50℃和70℃测试温度下击穿场强随老化时间的增加均呈下降趋势,下降趋势基本相同,并且随着测试温度的增加,硅橡胶纳米复合材料与纯硅橡胶的击穿场强均减小。
  
  两种材料内部积聚的空间电荷量随着老化时间的增加均呈上升趋势,上升趋势基本相同,且在相同老化时间后,硅橡胶纳米复合材料试样内部积聚的空间电荷量小于纯硅橡胶。通过上述实验可知,纳米复合硅橡胶具有与纯硅橡胶相近的耐电老化性能。
  
  关键词 硅橡胶复合材料;电老化;电气性能。
  
  Abstract.
  
  In the DC cable system, the field intensity distribution in the insulation structureis inversely proportional to the material volume conductivity when the attachment issteady.? In? the? XLPE? insulated? high? voltage? DC? cable? terminal,? the? electricalconductivity of the silicone rubber reinforced insulation is less than the cable XLPEinsulation,? and? the? high? electric? field? strength? zone? in? the? high? pressure? DC? cableterminal? with? the? ordinary? silicone? rubber? as? the? enhanced? insulation.? The? field? islocated in the silicone rubber enhanced insulation. In general, the breakdown strengthof? the? HVDC? cable? XLPE? insulation? is? far? greater? than? that? of? the? silicone? rubberinsulation.? Therefore,? the? electric? field? distribution? in? the? XLPE? insulated? highvoltage? DC? cable? terminal? with? the? common? silicone? rubber? as? the? enhancedinsulation is not reasonable. The edge material can be a good solution to this problem.
  
  Due to the long-term operation of the cable in the HVDC electric field, the insulationstrength of the insulating material is reduced and the attachment insulation is easilypenetrated, and the stability of the HVDC cable operation is reduced, and the normalpower? supply? of? the? whole? transmission? system? is? endangered.? Therefore,? theelectrical aging resistance of? insulation? materials? is? an? important? factor? determiningthe overall insulation capacity of cable accessories.
  
  In? this? dissertation,? silicon? rubber? nanocomposites? with? nonlinear? conductivityare made from solid silicon rubber as matrix, nano graphite and nano carbon black asfiller.? The? material? and? pure? silicone? rubber? are? used? for? electrical? aging? test.? Thepure? silicone? rubber? and? silicone? rubber? nanocomposite? after? the? aging? and? agingtime of 720h, 1440h and 2160h are tested. The electrical properties, DC breakdowncharacteristics and space charge characteristics of the composite materials are used toanalyze? the? electrical? properties? of? pure? silicon? rubber? and? silicone? rubbernanocomposites after different aging time, and compare them.
  
  The? results? show? that? in? the? process? of? electrical? aging,? after? the? same? agingtime, the conductivity of the two materials at 30, 50 and 70 centigrade increases withthe increase of the aging time, and the growth degree is similar, and with the increaseof? the? test? temperature,? silicon? is? increased.? The? electrical? conductivity? of? rubbernanocomposites and pure silicone rubber increases. At the temperature of 30, 50 and70, the breakdown field strength of the two materials decreased with the increase ofaging time, and the decrease trend was basically the same, and the breakdown fieldstrength? of? the? silicon? rubber? nanocomposites? and? pure? silicone? rubber? decreasedwith the increase of the test temperature. The amount of space charge accumulated inthe two kinds of materials increases with the increase of aging time, and the increasetrend? is? basically? the? same,? and? after? the? same? aging? time,? the? amount? of? spacecharge in the internal accumulation of the silicon rubber nanocomposites is less thanthat? of? the? pure? silicon? rubber.? The? above? experiments? show? that? nano? compositesilicone rubber has the same electrical resistance property as pure silicone rubber.
  
  Keywords:silicone rubber nanocomposites,electrical aging,electrical properties.
  
  目录
  
  摘? 要  
  第 1 章绪论  
  1.1? 课题背景及研究目的和意义  
  1.2? 国内外研究现状  
  1.2.1? 聚合物基非线性复合材料研究进展  
  1.2.2? 聚合物材料老化研究进展  
  1.3? 亚博电竞官方登录链接主要研究内容  
  第 2 章硅橡胶基纳米复合材料的制备与电老化实验方法  
  2.1? 实验材料与设备  
  2.2? 试样的制备  
  2.3? 电老化实验方法  
  2.4? 本章小结  
  第 3 章电老化对硅橡胶基纳米复合材料电导率和击穿特性的影响  
  3.1? 电老化后硅橡胶基纳米复合材料的电导率特性  
  3.1.1? 实验方法  
  3.1.2? 实验结果  
  3.2? 电老化后硅橡胶基纳米复合材料的直流击穿特性  
  3.2.1? 实验方法  
  3.2.2? 实验结果  
  3.3? 本章小结  
  第 4 章电老化对硅橡胶基纳米复合材料空间电荷特性的影响  
  4.1? 实验方法  
  4.1.1? 空间电荷实验系统  
  4.1.2? 空间电荷测试方法  
  4.2? 实验结果  
  4.3? 本章小结  
  结? 论 
  参考文献  
  攻读硕士学位期间发表的学术亚博电竞官方登录链接及获得成果  
  致? 谢
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