DC Surface Flashover Characteristics of Polyimide in Vacuum at Different Temperatures

doi:10.7652/xjtuxb201404009

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DC Surface Flashover Characteristics of Polyimide in Vacuum at Different Temperatures

更新时间：2025-04-29

- DC Surface Flashover Characteristics of Polyimide in Vacuum at Different Temperatures
- Vol. 48, Issue 4, Pages: 47-51(2014)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201404009
  CLC： TM85
- Online First：10 April 2014，
  
  Published：2014
- 稿件说明：
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DC Surface Flashover Characteristics of Polyimide in Vacuum at Different Temperatures[J]. 2014, 48(4): 47-51.
DOI：

DC Surface Flashover Characteristics of Polyimide in Vacuum at Different Temperatures[J]. 2014, 48(4): 47-51. DOI： 10.7652/xjtuxb201404009.

摘要

为了提高固体绝缘介质应用于复杂工程环境下的可靠性

以自制备的聚酰亚胺(PI)平板试样为研究对象

实验研究了PI在不同温度(193～373 K)范围内的真空直流沿面闪络特性

并分析其闪络机理。结果发现:随着温度的升高

闪络电压呈现先降低、后升高、再降低的变化规律

且分别在273 K与313 K时达到最小、最大值; 高温区域(313～373 K)的闪络电压较低温区域(193～273 K)的闪络电压有明显提高。对实验结果进行分析

认为高场强下阴极附近电子发射、固体绝缘介质体内的电荷输运以及气体解吸附都是影响固体绝缘介质真空直流沿面闪络特性的重要原因

其中的气体解吸附更是影响真空直流沿面闪络特性的最关键因素。

Abstract

To enhance the reliability of solid dielectric insulation in complex engineering environments

the self-made polyimide(PI)sample in vacuum is taken as the object

and the DC surface flashover characteristics at different temperatures(193-353 K)are experimentally researched. It is found that the DC surface flashover voltage firstly decreases then increases and finally decreased again with the increasing of temperature. The DC flashover voltage reaches the maximum at 313 K and minimum at 273 K. the flashover voltages are significantly heightened in high temperature region(313-373 K)compared with that in lower temperature region(193-273 K). The experiments suggest that the electron emission near the cathode

charge transport of dielectric insulators and gas desorption are important to affect DC flashover voltage of PI in vacuum

and the gas desorption plays the key factor.

关键词

Keywords

references

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