Insulation Characteristics of c-C4F8/N2 with Less c-C4F8 Applied to HVDC-GIL

ZHANG Ran; WANG Jue; YAN Ping

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Insulation Characteristics of c-C₄F₈/N₂ with Less c-C₄F₈ Applied to HVDC-GIL

更新时间：2025-12-08

- Insulation Characteristics of c-C₄F₈/N₂ with Less c-C₄F₈ Applied to HVDC-GIL
- Vol. 44, Issue 8, Pages: 2672-2678(2018)
- 作者机构：
  
  1. 中国科学院电工研究所
  2. 中国科学院电力电子与电气驱动重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 August 2018，
  
  Published：2018
- 稿件说明：
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ZHANG Ran, WANG Jue, YAN Ping. Insulation Characteristics of c-C₄F₈/N₂ with Less c-C₄F₈ Applied to HVDC-GIL[J]. 2018, 44(8): 2672-2678.
DOI：

ZHANG Ran, WANG Jue, YAN Ping. Insulation Characteristics of c-C₄F₈/N₂ with Less c-C₄F₈ Applied to HVDC-GIL[J]. 2018, 44(8): 2672-2678. DOI：

摘要

目前GIL中使用的气体绝缘介质均为SF6气体。SF6气体虽然具有优异的电气性能

但是全球变暖潜能值（GWP）极高

因此迫切需要找到能够替代SF6的绝缘气体。文中以混合比k（c-C

在混合气体中的体积分数）低于20%的c-C

混合气体为主要研究对象

通过调节气压（0.1

.65 MPa）和气隙间距（1

mm）测量了不同混合比k下混合气体的击穿电压和闪络电压

并与纯SF6气体的击穿电压和闪络电压进行了对比分析。试验结果表明:c-C

与N2呈协同效应关系;k=20%时

混合气体绝缘击穿强度约为纯SF6气体的0.6倍

绝缘闪络强度约为纯SF6气体的0.7倍

2 h耐受电压比短时闪络电压降低了5%

0%;通过提高c-C

混合气体的气体压强或增大绝缘距离可以实现替代SF6的目的。考虑到c-C

在放电中的碳析出问题

应避免混合气体用于频繁放电的设备中。

Abstract

Insulating gas SF6 has been used in gas insulated line（GIL） due to its excellent electrical capabilities. However

it is urgently required to find a gas to substitute SF6 due to its high global warming potential（GWP）. Consequently

we studied c-C

mixture gas with gas ratio lower than 20% as the main object. The DC breakdown voltage and flashover voltage of c-C

mixture gas with different gas ratio k were measured in different gas pressur

es（0.1

.65 MPa） and gap distance（1

mm） and then compared with that of pure SF6. The results show that the c-C

mixture gas presents a synergistic effect. The breakdown strength of mixture gas with 20% c-C

is about 0.6 times that of pure SF6 and the flashover strength is about 0.7 times. The two-hour withstand voltage is 5%

0% lower than the flashover voltage. There is a possibility that the c-C

mixed gas can be used for substituting SF6

with increasing the gas pressure or insulation dimension. Because the carbon granule is one components of decomposition products for discharged c-C

gas

the application of the c-C

mixture gas in frequent discharge devices should be avoided.

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