磁场环境下室温硫化硅橡胶电树枝生长特性

发布时间：2018-02-16 07:52

本文关键词： 硅橡胶电树枝磁场脉冲电压交流电压分形维数电力电缆　出处：《高电压技术》2017年08期 　论文类型：期刊论文

【摘要】：大电流产生强磁场,从而使电树枝生长过程中承受较大的电磁力。随着电力电缆载流量的不断增加,研究磁场环境下室温硫化(RTV)硅橡胶电树枝生长特性具有重要的理论意义和实用价值。为此,选用自制RTV硅橡胶试样,采用脉冲电源和交流电源对试样加压,分别模拟了试样在脉冲电场、交流电场与磁场的耦合场下的电树枝生长状况,研究了不同电压和磁场条件下的电树枝生长特性。结果表明:随着磁通密度的升高,在脉冲电压和交流电压下电树枝的起始电压会降低;脉冲电压下,电树枝长度会由于外界高磁场的存在而明显增加;交流电压下,磁通密度的升高会使电树枝类型发生变化,当磁通密度为400 m T时,所有电树枝呈丛林状,电树枝生长速度明显降低,400 m T时电树枝分形维数明显高于0 m T时的对应值。该研究结果为进一步研究磁场条件下硅橡胶中电树枝生长机理提供了参考。
[Abstract]:High current produces a strong magnetic field, which makes the electric tree bear a large electromagnetic force during the growth process. With the increasing of the power cable load, It is of great theoretical significance and practical value to study the electric dendritic growth characteristics of room temperature vulcanized silicone rubber in magnetic field. Therefore, the self-made RTV silicone rubber sample is selected, and the sample is pressurized by pulse power supply and AC power supply. The electric dendritic growth of samples under the coupling field of pulsed electric field, alternating current field and magnetic field is simulated, and the characteristics of electric tree growth under different voltages and magnetic fields are studied. The results show that with the increase of magnetic flux density, At the pulse voltage and AC voltage, the initial voltage of the electric tree will decrease; the length of the electric tree will increase obviously because of the existence of the external high magnetic field; at the AC voltage, the type of electric tree will change with the increase of magnetic flux density. When the flux density is 400m T, all electric branches are in the form of jungle. The fractal dimension of electric tree is obviously higher than the corresponding value of 0 Mt when the growth rate of electric tree is reduced obviously. The results provide a reference for further study on the growth mechanism of electric tree in silicone rubber under magnetic field.
【作者单位】：天津大学电气与自动化工程学院;国网天津市电力公司电力科学研究院;国网天津市电力公司检修公司;
【基金】：国家重点基础研究发展计划(973计划)(2014CB239506)~~
【分类号】：TM215.2

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