电网技术2024，Vol.48Issue(7)：3084-3090,中插118-中插119,9.DOI:10.13335/j.1000-3673.pst.2023.0934
等离子体喷射触发型SF6和SF6/N2间隙开关的触发性能劣化规律
Degradation Law of Trigger Characteristics of SF6 and SF6/N2 Gap Switches Triggered by Plasma Jet
摘要
Abstract
In the Jiangsu-Baihetan 士800 kV ultra-high voltage(UHV)hybrid DC transmission project,used to bypass the controllable arresters,the gas gap switches triggered by the plasma jet bear the advantages in fast response,strong insulation recovery ability,and large flow capacity,having a broad application prospect.However,there are still a lack in their optimal selection of gas atmosphere for the trigger gap and a further study needed for the enhancement of trigger characteristics and trigger life.In this paper,by building an experimental platform of plasma jet triggering,the degradation law of the trigger characteristics of plasma jet triggering gas gap is studied.The critical circuit parameters of the gap triggering are respectively obtained in the SF6 and the SF6/N2 mixture,and the trigger life experiment and the law of the performance degradation are carried out under the determined circuit parameters.The results show that,under the same insulation strength and with l0kV gap voltage is 10 kV,the minimum trigger voltage in 0.2 MPa SF6 is 3.5 kV,while it is reduced to 2.6 kV in the condition of 0.266 MPa SF6/N2.Under the optimal trigger circuit parameters and the same insulation strength,at the beginning of the experiment,the gap conduction delay in SF6 is～270 μs,the maximum plasma injection height is 4.8 cm,and the maximum injection velocity is 1296 m/s,while in SF6/N2,the gap conduction delay decreases to～100 μs,the maximum plasma injection height increases to 7.2 cm,and the maximum injection velocity increases to 1525 m/s.With the increase of discharge times,the gap conduction delay increases,the maximum plasma injection height decreases,and the maximum injection velocity decreases until the first trigger failure occurs and the trigger life is over.The trigger life of the gap in SF6 is only 695 times,while that of the gap in SF6/N2 reaches 1540 times.This paper provides a theoretical guidance for the performance and life improvement of the gas gap trigger switches for the controllable arrester,and contributes to its popularization and application in engineering fields.关键词
气体氛围/触发特性/触发寿命/性能劣化/SF6和SF6/N2混合气体Key words
gas atmosphere/trigger characteristics/trigger life/performance degradation/SF6 and the SF6/N2 mixture分类
信息技术与安全科学引用本文复制引用
李晓昂,蒋攀,李志兵,张然,王海晖,赵科,张乔根..等离子体喷射触发型SF6和SF6/N2间隙开关的触发性能劣化规律[J].电网技术,2024,48(7):3084-3090,中插118-中插119,9.基金项目
国家电网有限公司科技项目(合同号:5500-202155107A-0-0-00):"特高压混合直流工程超高速控制和保护用SF6/N2触发间隙开关的关键技术研究及设备研制".Project Supported by Science and Technology Project of State Grid Corporation of China(Contract No.5500-202155107A-0-0-00):"Key Technology Research and Equipment Development of SF6/N2 Trigger Gap Switch for Ultra-High Speed Control and Protection of UHV Hybrid DC Project". （合同号:5500-202155107A-0-0-00）
