直流电压作用下极不均匀电场中SF<sub>6</sub>/N<sub>2</sub>混合气体局部放电起始特性研究

庞培川; 孙泽明; 张芊; 侯志强; 张轩瑞; 孙善源; 李军浩

doi:10.7652/xjtuxb201904007

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直流电压作用下极不均匀电场中SF₆/N₂混合气体局部放电起始特性研究

更新时间：2025-07-09

- 直流电压作用下极不均匀电场中SF₆/N₂混合气体局部放电起始特性研究
- Partial Discharge Initial Characteristics of SF₆/N₂ Mixture in Extremely Inhomogeneous Electric Field under DC High Voltage
- 西安交通大学学报 2019年53卷第4期页码：44-50
- 作者机构：
  
  西安交通大学电气工程工程学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2018-08-03。作者简介: 庞培川(1993—),男,硕士生;李军浩(通信作者),男,副教授。基金项目: 国家自然科学基金资助项目(51877169)
- DOI：10.7652/xjtuxb201904007
  中图分类号： TM85
- 网络首发：2019-04-10，
  
  纸质出版：2019
- 稿件说明：
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庞培川, 孙泽明, 张芊, 等. 直流电压作用下极不均匀电场中SF₆/N₂混合气体局部放电起始特性研究[J]. 西安交通大学学报, 2019,53(4):44-50. DOI: 10.7652/xjtuxb201904007.

Partial Discharge Initial Characteristics of SF₆/N₂ Mixture in Extremely Inhomogeneous Electric Field under DC High Voltage[J]. 2019, 53(4): 44-50. DOI: 10.7652/xjtuxb201904007.
庞培川, 孙泽明, 张芊, 等. 直流电压作用下极不均匀电场中SF₆/N₂混合气体局部放电起始特性研究[J]. 西安交通大学学报, 2019,53(4):44-50. DOI: 10.7652/xjtuxb201904007. DOI：

Partial Discharge Initial Characteristics of SF₆/N₂ Mixture in Extremely Inhomogeneous Electric Field under DC High Voltage[J]. 2019, 53(4): 44-50. DOI: 10.7652/xjtuxb201904007. DOI：

摘要

为了解决直流气体绝缘输电线路(GIL)中绝缘气体SF

高温室效应、价格昂贵等问题

采用SF

与N

混合绝缘的解决方案。针对直流GIL中极不均匀电场的情形

搭建直流高压试验平台

研究了SF

混合气体在不同SF

体积分数、不同电压极性和不同气压条件下的局部放电起始特性。结果表明:气压为0.3 MPa电场畸变特别严重时

混合气体的起始放电电压(U

)会高于纯SF

气体的起始放电电压

且电场畸变越严重

混合气体U

高于纯SF

气体所需的SF

含量越低; 曲率半径(r)为20、50 μm的尖端气体相对绝缘强度(k)随SF

含量变化的趋势一致

呈现双峰形状

r为100、120和160 μm的尖端k随SF

变化呈现单峰形状

且负极性电压下的k高于正极性电压下的k; r为20 μm的尖端在SF

浓度为20%时

0.1～0.3 MPa气压范围内混合气体U

高于纯SF

气体

气压为0.4 MPa时

混合气体U

为纯SF

气体的95%

已基本达到纯SF

气体的绝缘强度。

Abstract

To solve the problems of high greenhouse effect and high price of SF

in DC gas insulated line(GIL)

a solution scheme of mixing SF

and N

is proposed. Aiming at the extremely inhomogeneous electric field

a DC high voltage test platform is constructed to analyze the initial discharge characteristics of different SF

ratios under different voltage polarities and gas pressures. The results show that in the case of 0.3 MPa

the partial discharge initial voltage(U

)of SF

mixture is higher than that of SF

when electric distortion is really serious

and the more serious the electric field distortion is

the less the SF

is needed. For 20 μm and 50 μm electrode tip

the gas relative dielectric strength k trends towards φ(SF

)

and its curve shape is doublet; for 100 μm

120 μm and 160 μm tip

the shape is singlet

and k value under negative voltage is larger than that under positive voltage. For 20 μm tip in 20% SF

when pressure is between 0.1 MPa and 0.3 MPa

the U

of SF

is larger than that of SF

and when pressure is 0.4 MPa

the U

of SF

is 95% of that of SF

关键词

Keywords

references

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直流电压作用下极不均匀电场中SF6/N2混合气体局部放电起始特性研究

Partial Discharge Initial Characteristics of SF6/N2 Mixture in Extremely Inhomogeneous Electric Field under DC High Voltage

DOI：10.7652/xjtuxb201904007

摘要

Abstract

关键词

Keywords

references

直流电压作用下极不均匀电场中SF₆/N₂混合气体局部放电起始特性研究

Partial Discharge Initial Characteristics of SF₆/N₂ Mixture in Extremely Inhomogeneous Electric Field under DC High Voltage