纳米Al_2O_3掺杂对绝缘纸的空间电荷及陷阱能级分布特征的影响
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摘要
传统纤维素纸在直流电场的作用下易于积聚空间电荷而导致介质内部电场发生畸变引发事故。为改善油浸纤维素绝缘纸在直流电场下的空间电荷特性,使空间电荷难以积聚且易于消散,利用纳米Al2O3对绝缘纸进行改性,采用脉冲电声法(PEA)测试了不同纳米含量的油浸改性纸样在直流电场下的空间电荷密度,并对陷阱参数进行了计算。结果表明:纳米Al2O3掺杂质量分数为1%时对空间电荷行为的抑制效果最佳;纳米氧化铝的掺杂激发了深陷阱的形成,增大了深陷阱的密度,改变了纤维素绝缘纸中的陷阱能级分布;陷阱能级分布的改变解释了改性绝缘纸的体积电阻率和直流击穿场强随纳米氧化铝含量变化的原因。研究结果可为进一步研究纤维素绝缘纸的改性技术和提高纤维素绝缘纸的各项性能提供参考。
Traditional cellulose paper is easy to accumulate space charge under the action of DC electric field, thus causing distortion of the electric field inside the medium. To improve the space charge characteristics of oil-impregnated cellulose insulation paper under DC electric field, and make the space charge difficult to accumulate and easy to dissipate, the cellulose insulation paper was modified with nano-Al_2O_3. The space charge density of oil-impregnated modified paper samples with different nanometer contents under DC electric field was tested by pulse electroacoustic method(PEA), and the characteristic parameters of trap were calculated. The results show that samples with 1% quality fraction nano-Al_2O_3 can improve the space charge behavior to the most degree. The doping of nano alumina can stimulate the formation of deep traps, which increases the density of deep traps and changes the trap energy distribution in cellulose insulation paper.The change of the trap characteristics explains the change of the DC breakdown field strength and volume resistivity of the insulating paper with the quality fraction various of nano-Al_2O_3. The research results can provide references for further research on the modification technology of cellulose insulation paper and the improvement of various properties of cellulose insulation paper.
Traditional cellulose paper is easy to accumulate space charge under the action of DC electric field, thus causing distortion of the electric field inside the medium. To improve the space charge characteristics of oil-impregnated cellulose insulation paper under DC electric field, and make the space charge difficult to accumulate and easy to dissipate, the cellulose insulation paper was modified with nano-Al_2O_3. The space charge density of oil-impregnated modified paper samples with different nanometer contents under DC electric field was tested by pulse electroacoustic method(PEA), and the characteristic parameters of trap were calculated. The results show that samples with 1% quality fraction nano-Al_2O_3 can improve the space charge behavior to the most degree. The doping of nano alumina can stimulate the formation of deep traps, which increases the density of deep traps and changes the trap energy distribution in cellulose insulation paper.The change of the trap characteristics explains the change of the DC breakdown field strength and volume resistivity of the insulating paper with the quality fraction various of nano-Al_2O_3. The research results can provide references for further research on the modification technology of cellulose insulation paper and the improvement of various properties of cellulose insulation paper.
引文
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[16]廖瑞金,吕程,吴伟强,等.纳米Al2O3改性变压器绝缘纸性能的研究[J].电力科学与技术学报,2014(1):3-7.LIAO Ruijin,LüCheng,WU Weiqiang,et al.Insulating properties of insulation paper modified by nano-Al2O3 for power transformer[J].Journal of Electric Power Science and Technology,2014(1):3-7.
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[20]TAKADA T,TAKASU N.Pulsed electro-acoustic method for measurement of space charge distribution in power cables under both DCand AC electric fields[J].Journal of Physics D:Applied Physics,1993,26(6):986-993.
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[2]郝建,黄博,CHEN G,等.空间电荷在多层结构油纸绝缘混合体系的积聚规律及其对电场分布的影响[J].高电压技术,2017,43(6):1973-1980.HAO Jian,HUANG Bo,CHEN G,et al.Space charge accumulation behavior of multilayer structure oil-paper insulation and its effect on electric field distribution[J].High Voltage Engineering,2017,43(6):1973-1980.
[3]NELSON J K,FOTHERGILL J C.Internal charge behaviour of nanocomposites[J].Nanotechnology,2004,15(5):586.
[4]王霞,王陈诚,朱有玉,等.高压直流塑料电缆绝缘用纳米改性交联聚乙烯中的空间电荷特性[J].高电压技术,2017,41(4):1096-1103.WANG Xia,WANG Chencheng,ZHU Youyu,et al.Space charge profiles in XLPE nano dielectrics used for HVDC plastic cable insulation[J].High Voltage Engineering,2017,41(4):1096-1103.
[5]宫斌,张冶文,郑飞虎,等.无机粉末掺杂对低密度聚乙烯中空间电荷分布及陷阱能级的影响[J].材料科学与工程学报,2006,24(1):109-113.GONG Bin,ZHANG Yewen,ZHENG Feihu,et al.Experimental research on influences of space charge distribution and trap levels in low density polyethylene doped with inorganic powders[J].Journal of Materials Science&Engineering,2006,24(1):109-113.
[6]兰莉,吴建东,纪哲强,等.纳米Si O2/低密度聚乙烯复合介质的击穿特性[J].中国电机工程学报,2012,32(13):138-143.LAN Li,WU Jiandong,JI Zheqiang,et al.Breakdown properties of nano-SiO2/LDPE composite[J].Proceedings of the CSEE,2012,32(13):138-143.
[7]CAO Y,IRWIN P C,YOUNSI K.The future of nanodielectrics in the electrical power industry[J].IEEE Transactions on Dielectrics and Electrical Insulation,2004,11(5):797-807.
[8]TANAKA T,KOZAKO M,FUSE N,et al.Proposal of a multi-core model for polymer nanocomposite dielectrics[J].IEEE Transactions on Dielectrics and Electrical Insulation,2005,12(4):669-681.
[9]LEWIS T J.Nannometric dielectrics[J].IEEE Transactions on Dielectric and Electrical Insulation,1994,1(5):812-825
[10]LEWIS T J.Interfaces:nanometric dielectrics[J].Journal of Physics D:Applied Physics,2005,38(2):202-212.
[11]柏舸,廖瑞金,刘娜,等.纳米氮化铝改性对芳纶1313绝缘纸介电特性的影响[J].高电压技术,2015,41(2):461-467.BAI Ge,LIAO Ruijin,LIU Na,et al.Influence of nano-AlN modification on the dielectric properties of meta-aramid paper[J].High Voltage Engineering,2015,41(2):461-467.
[12]TANG C,CHEN G,FU M,et al.Space charge behavior in multi-layer oil-paper insulation under different DC voltages and temperatures[J].IEEE Transactions on Dielectrics and Electrical Insulation,2010,17(3):775-784.
[13]夏旭.聚酰亚胺/三氧化二铝复合薄膜耐电晕性能及机理[D].哈尔滨:哈尔滨理工大学,2014.XIA Xu.Corona resistant property and mechanism of polyimide/Al2O3composite films[D].Harbin,China:Harbin University of Science and Technology,2014.
[14]李鸿岩,郭磊,刘斌,等.聚酰亚胺/纳米Al2O3复合薄膜的介电性能[J].中国电机工程学报,2006,26(20):166-170.LI Hongyan,GUO Lei,LIU Bin,et al.The dielectic properties of polyimide/nano-Al2O3 composites films[J].Proceedings of the CSEE,2006,26(20):166-170.
[15]杜岳凡,吕玉珍,李成榕,等.半导体纳米粒子改性变压器油的绝缘性能及机制研究[J].中国电机工程学报,2012,32(10):177-182.DU Yuefan,LüYuzhen,LI Chengrong,et al.Insulating property and mechanism of semiconducting nano-particles modified transformer oils[J].Proceedings of the CSEE,2012,32(10):177-182.
[16]廖瑞金,吕程,吴伟强,等.纳米Al2O3改性变压器绝缘纸性能的研究[J].电力科学与技术学报,2014(1):3-7.LIAO Ruijin,LüCheng,WU Weiqiang,et al.Insulating properties of insulation paper modified by nano-Al2O3 for power transformer[J].Journal of Electric Power Science and Technology,2014(1):3-7.
[17]GAO W,XIANG Z,CHEN K,et al.Effect of depth beating on the fiber properties and enzymatic saccharification efficiency of softwood kraft pulp[J].Carbohydrate Polymers,2015,127:400-406.
[18]单芙蓉,于志明,罗丽丝,等.硅烷偶联剂KH550表面改性纳米Al2O3的研究[J].化工新型材料,2013(5):169-170,185.SHAN Furong,YU Zhiming,LUO Lisi,et al.Study on surface modification of nano-alumina by silane coupling agent KH550[J].New Chemical Materials,2013(5):169-170,185.
[19]CAO Y,IRWIN P C,YOUNSI K.The future of nanodielectrics in the electrical power industry[J].IEEE Transactions on Dielectrics and Electrical Insulation,2004,11(5):797-807.
[20]TAKADA T,TAKASU N.Pulsed electro-acoustic method for measurement of space charge distribution in power cables under both DCand AC electric fields[J].Journal of Physics D:Applied Physics,1993,26(6):986-993.
[21]MORSHUIS P,JEROENSE M.Space charge measurements on impregnated paper:a review of the PEA method and a discussion of results[J].IEEE Electrical Insulation Magazine,1997,13(3):26-35.
[22]ZHANG Y,YANG B,TU D,et al.Measuring distribution of carrier trap energy state density at interface of dielectric with step pressure wave method[C]∥Conference on Electrical Insulation and Dielectric Phenomena.Cancun,Mexico:IEEE,2002:303-308.
[23]WU K,DISSADO L A,OKAMOTO T.Percolation model for electrical breakdown in insulating polymers[J].Applied Physics Letters,2004,85(19):4454-4456.
[24]WU K,WANG Y,CHENG Y,et al.Statistical behavior of electrical breakdown in insulating polymers[J].Journal of Applied Physics,2010,107(6):327.