Analytical model for the spatiotemporal permittivity of uncured-composite devices in an AC electric field

Shen Zikui; Wang Xilin; Xin Zhenyu; Zhang Tianfeng; Xu Chi; Jia Zhidong

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Analytical model for the spatiotemporal permittivity of uncured-composite devices in an AC electric field

机译：交流电场上未固化复合装置时空介电常数的分析模型

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Electric-field grading by dielectric permittivity gradient devices is an effective way of enhancing the insulation performance. In situ electric-field-driven assembly is an advanced method for the fabrication of insulating devices with adaptive permittivity gradients; however, there is no theoretical guidance for its use in design. We develop an analytical model for the spatiotemporal permittivity of an uncured-composite device in an AC electric field and investigate the coupling effects between the in situ assisted electric field and rod-like filler self-assembly in three devices: a pin-flat insulator, a basin insulator, and a silicone-gel-insulated gate bipolar transistor. Our model is based on optical images and dielectric permittivity monitoring, thus avoiding complicated electrodynamic calculations. The electric-field uniformity follows a U-shaped curve with assisted-voltage application time. We also find a combination of experimental parameters that constitutes an optimal tradeoff between internal and surface electric-field uniformities. This work establishes a theoretical design framework to optimize the performance (e.g. flashover voltage and breakdown strength) of a composite device.

机译：利用介电常数梯度器件进行电场分级是提高绝缘性能的有效途径。现场电场驱动组装是一种先进的具有自适应介电常数梯度的绝缘器件制作方法；然而，在设计中使用它并没有理论指导。我们建立了交流电场中未固化复合器件时空介电常数的分析模型，并在三种器件中研究了原位辅助电场和棒状填料自组装之间的耦合效应：针形扁平绝缘体、盆形绝缘体和硅胶绝缘栅双极晶体管。我们的模型基于光学图像和介电常数监测，从而避免了复杂的电动力学计算。电场均匀性随辅助电压施加时间呈U形曲线。我们还发现，实验参数的组合构成了内部和表面电场均匀性之间的最佳折衷。这项工作建立了一个理论设计框架，以优化复合器件的性能（如闪络电压和击穿强度）。

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来源
《Journal of Physics, D. Applied Physics: A Europhysics Journal》 |2021年第15期|共10页
作者
Shen Zikui; Wang Xilin; Xin Zhenyu; Zhang Tianfeng; Xu Chi; Jia Zhidong;
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作者单位

Tsinghua Univ Shenzhen Int Grad Sch Engn Lab Power Equipment Reliabil Complicated Coa Shenzhen 518055 Peoples R China;

Tsinghua Univ Shenzhen Int Grad Sch Engn Lab Power Equipment Reliabil Complicated Coa Shenzhen 518055 Peoples R China;

Tsinghua Univ Shenzhen Int Grad Sch Engn Lab Power Equipment Reliabil Complicated Coa Shenzhen 518055 Peoples R China;

Tsinghua Univ Shenzhen Int Grad Sch Engn Lab Power Equipment Reliabil Complicated Coa Shenzhen 518055 Peoples R China;

Tsinghua Univ Shenzhen Int Grad Sch Engn Lab Power Equipment Reliabil Complicated Coa Shenzhen 518055 Peoples R China;

Tsinghua Univ Shenzhen Int Grad Sch Engn Lab Power Equipment Reliabil Complicated Coa Shenzhen 518055 Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类应用物理学;
关键词
spatiotemporal permittivity; permittivity gradient device; electric-field grading; self-assembly;

机译：时空介电常数;介质梯度装置;电场分级;自组装;

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Analytical model for the spatiotemporal permittivity of uncured-composite devices in an AC electric field

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