纳米蒙脱土改性绝缘纸板的介电特性

发布时间：2018-03-14 14:30

本文选题：换流变压器　切入点：油纸绝缘　出处：《高电压技术》2017年09期 　论文类型：期刊论文

【摘要】：为研究陷阱参数对纳米蒙脱土(MMT)改性绝缘纸板介电特性的影响,探索出实验室制备纳米MMT改性绝缘纸板工艺。研究了其力学性能及介电特性随纳米掺杂比例的变化规律,借助热刺激电流(TSC)法测量了不同掺杂比例下改性纸板的陷阱参数,分析了纳米掺杂对改性纸板力学性能及介电特性的影响机理。试验结果表明:随着MMT纳米掺杂比例的提高,改性绝缘纸板的介电常数和机械抗张强度呈现先降低后升高的趋势。纳米MMT的掺杂使纸板电导率增加,其非线性拐点对应电场强度随纳米掺杂比例的提高逐渐降低。击穿场强随纳米掺杂比例的增加呈先增后降趋势。借助能带理论分析得出,陷阱电荷量的增加将导致改性纸板的非线性电导率上升;陷阱深度的增加将提高改性纸板击穿场强,陷阱特性是影响改性纸板介电特性变化的主要原因。
[Abstract]:In order to study the effect of trap parameters on the dielectric properties of nano-montmorillonite modified insulating paperboard, the preparation process of nano-MMT modified insulating paperboard in laboratory was explored. The variation of mechanical properties and dielectric properties with nano-doping ratio was studied. The trap parameters of modified paperboard with different doping ratios were measured by means of thermal stimulated current (TSC) method, and the influence mechanism of nano-doping on the mechanical properties and dielectric properties of modified paperboard was analyzed. The experimental results showed that: with the increase of nano-doping ratio of MMT, the effect of nano-doping on the mechanical properties and dielectric properties of modified paperboard was analyzed. The dielectric constant and mechanical tensile strength of modified insulating paperboard decreased first and then increased. The corresponding electric field intensity at the nonlinear inflection point decreases with the increase of nano-doping ratio, and the breakdown field strength increases first and then decreases with the increase of nano-doping ratio. The increase of trap charge will lead to the increase of nonlinear conductivity of modified paperboard, and the increase of trap depth will increase the breakdown field strength of modified paperboard, and the trap property is the main reason that affects the change of dielectric properties of modified paperboard.
【作者单位】：哈尔滨理工大学工程电介质及其应用教育部重点实验室;国网黑龙江省电力有限公司电力科学研究院;
【基金】：国家自然科学基金(51407051;51677046) 黑龙江省普通本科高等学校青年创新人才培养计划(编号略)~~
【分类号】：TM215.6

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