双层绝缘介质空间电荷信号研究
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摘要
本研究提出了双层绝缘介质界面空间电荷信号产生的物理模型,认为界面空间电荷和两种绝缘介质介电常数的差异引起了界面空间电荷信号电流。提出了依据压力波方向与电场方向的一致性来判断界面信号电流极性的方法,通过实验进行了验证。并研究了低电场下界面空间电荷信号与外加电场的关系。结果表明:界面空间电荷信号随外加电场强度的增加而线性增大。在双层绝缘介质的测量信号中减去由界面介电常数的变化引起的信号即可得到界面真实的空间电荷信号。
A physical model of space charge generation in double-layer insulating media was proposed. It was considered that the interface space charge signal current was caused by the space charge and the permittivity difference of two insulating media. According to the consistency of pressure wave direction and electric field direction, a method for judging the polarity of interface signal current was proposed and verified by experiment. The relation between interface space charge signal and applied electric field was investigated under low electric field. The results show that with the increase of applied electric field strength, the interface space charge signal increases linearly. The real space charge signal in the interface can be obtained by subtracting the signal caused by the change of dielectric constant of the interface from the measured signal of the double-layer insulating media.
A physical model of space charge generation in double-layer insulating media was proposed. It was considered that the interface space charge signal current was caused by the space charge and the permittivity difference of two insulating media. According to the consistency of pressure wave direction and electric field direction, a method for judging the polarity of interface signal current was proposed and verified by experiment. The relation between interface space charge signal and applied electric field was investigated under low electric field. The results show that with the increase of applied electric field strength, the interface space charge signal increases linearly. The real space charge signal in the interface can be obtained by subtracting the signal caused by the change of dielectric constant of the interface from the measured signal of the double-layer insulating media.
引文
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[11]郑飞虎,张冶文,吴长顺,等.用于固体介质中空间电荷的压电压力波法与电声脉冲法[J].物理学报,2003,52(5):1137-1142.
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[2] TERASHIMA K, SUKUKI H, HARA M, et al. Research and development of±250kV DC XLPE cables[J]. IEEE Transactions on Power Delivery,1998,13(1):7-16.
[3] CHUNG Y H,KWON J B,JUNG T S,et al.New synthetic test circuit for the operational test of HVDC thyristor valve[C]//Proceedings of the 45th 2014 CIGRE Session. Paris,France:CIGRE,2014.
[4] ZHANG Y, LEWINER J, ALQUIE C, et al. Evidence of strong correlation between space-charge buildup and breakdown in cable insulation[J]. IEEE Transactions on Dielectrics and Electrical Insulation,1996,3(6):778-783.
[5] MURAKAMI Y, NEMOTO M, OKUZUMI S, et al. DC conduction and electrical breakdown of MgO/LDPE nanocomposite[J]. IEEE Transactions on Dielectrics and Electrical Insulation,2008,15(1):33-39.
[6] HAYASE Y, TANAKA Y, TAKADA T, et al. Space charge suppression effect of nano-size fillers added to polymeric materials[J]. Journal of Physics:Conference Series,2009,183(1):012004.
[7]吴振升,叶青,周远翔,等.表面修饰纳米SiO2/XLPE的电导电流和空间电荷特性[J].高电压技术,2014,40(10):3268-3275.
[8]王俏华,顾金,吴建东,等.预处理温度对高压直流电缆附件绝缘材料空间电荷的影响[J].电网技术,2011,35(1):122-126.
[9]兰莉,吴建东,王雅妮,等.低密度聚乙烯/乙丙橡胶双层介质的界面空间电荷特性[J].中国电机工程学报,2015,35(5):1266-1272.
[10]何华琴,王霞,吴超一,等.加聚酰亚胺薄膜阻挡层的聚乙烯中空间电荷分布特性的研究[J].绝缘材料,2005,38(5):35-38.
[11]郑飞虎,张冶文,吴长顺,等.用于固体介质中空间电荷的压电压力波法与电声脉冲法[J].物理学报,2003,52(5):1137-1142.
[12]张冶文,李英,陈王丽华,等.固体电介质中空间电荷分布测量方法及其比较[C]//1998年电工测试技术学术年会暨电气绝缘测试技术学术交流会.上海,1998:29-34.
[13]张冶文,夏钟福, LEWINER J.高压电力电缆中的空间电荷分布测量[J].电线电缆,1998(5):19-21.