AC Breakdown Initiated by Thermally Induced Bubble of Nonflammable Fluorocarbon and Its Application Prospect in GIL

NIU Wenhao; ZHANG Guoqiang; LIN Tao; LI Kang; Adrian Traian Plesca

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AC Breakdown Initiated by Thermally Induced Bubble of Nonflammable Fluorocarbon and Its Application Prospect in GIL

更新时间：2025-12-08

- AC Breakdown Initiated by Thermally Induced Bubble of Nonflammable Fluorocarbon and Its Application Prospect in GIL
- Vol. 43, Issue 3, Pages: 743-753(2017)
- 作者机构：
  
  1. 中国科学院电工研究所
  2. 2. 乔戈艾萨奇理工大学
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 March 2017，
  
  Published：2017
- 稿件说明：
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NIU Wenhao, ZHANG Guoqiang, LIN Tao, et al. AC Breakdown Initiated by Thermally Induced Bubble of Nonflammable Fluorocarbon and Its Application Prospect in GIL[J]. 2017, 43(3): 743-753.
DOI：

NIU Wenhao, ZHANG Guoqiang, LIN Tao, et al. AC Breakdown Initiated by Thermally Induced Bubble of Nonflammable Fluorocarbon and Its Application Prospect in GIL[J]. 2017, 43(3): 743-753. DOI：

摘要

目前已有一些环保型氟碳介质可替代SF

气体应用于变压器、GIS甚至GIL中

其在工作中以液态或气液两相态的形式存在。但是

液态绝缘介质在受热状态下的气液两相流的绝缘特性和放电机理尚未明晰。文中采用自发热电极进行了氟碳介质热致气液两相流随热流密度、工作压力等热力学参数的工频击穿电压测量实验

结果表明:其击穿电压随热流密度呈"Z"字型的曲线规律变化;击穿电压突变点与表面过热度的极值点高度相符

以此提出了表征击穿电压突变的特征值和特征向量。最后

通过仿真分析和计算初步证明

环保型氟碳介质在绝缘和冷却两个方面完全具有替代SF

气体应用于环保介质绝缘管道电缆的可行性。

Abstract

Some environmental friendly fluorocarbons could be used as substitute for SF

in power transformers

GIL or even GIS

where they exist as liquid or two-phase flow condition.However

the insulating properties and discharge mechanism of liquid dielectrics under the heated two-phase flow state are not clearly understood yet.We experimentally studied and measured the AC breakdown voltage（BDV） of thermal bubble induced two-phase flow condition of fluorocarbon by self-heating electrodes with different thermodynamic parameters as heat flux

working pressure

and gap distance.According to the results

the BDV changes with heat density like an elongated "Z" shaped curve.And the BDV converting point is highly consistent with the apex value of surface superheat

the eigenvalues and eigenvectors representing the BDV c

onverting point have been proposed accordingly.Finally

a simulation analysis and calculation of insulating and cooling characteristics of a GIL model has been accomplished

which proves the feasibility of the environmental friendly fluorocarbon dielectrics as SF

substitute used in the new designed GIL.

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