文档名：特高压混合直流工程快速旁路保护用兆伏级SF6间隙等离子体喷射触发特性及工程设计
摘要：在江苏白鹤滩±800kV特高压混合直流工程中,受端交流侧三相接地故障穿越失败时,会在±400kV柔直母线上产生高幅值过电压,严重威胁柔直阀组安全,而基于等离子体喷射的超快速旁路开关1ms内将柔直母线快速接地保护柔直阀组是一种全新的解决方案.DC400kV触发间隙需满足高耐压(>1.2MV)、低工作系数(<5%)、短延时(1250kV,临界可触发电压<50kV,导通时延<0.5ms.该研究结果为特高压混合直流输电系统中柔直阀组快速保护用兆伏级SF6触发间隙工程应用提供了理论支持和工程初步设计方案.
Abstract：IntheJiangsuBaihetan±800kVUHVhybridDCproject,whenthethree-phasegroundfaulttraversalfailureontheACsideofthereceivingendoccurs,ahighamplitudeovervoltagewillbegeneratedonthe±400kVflexbus,whichseriouslythreatensthesafetyoftheflexmanifolds,thustheultra-fastbypassswitchbasedontheplasmainjectionquicklygroundingtheflexbuswithin1mstoprotecttheflexmanifoldsisabrand-newsolution.TheDC400kVtriggergapneedstomeetthestringentrequirementsofhighwithstandvoltage(>1.2MV),lowoperatingcoefficient(<10%),triggerdelay(<1ms),andlargethrough-flow.Thekeytoproblemsishowtorealizethereliabletriggerconductionwithhighairpressureandlonggapandtoputforwardtheengineereddesignscheme.Inthispaper,aresearchplatformofthetriggergapbasedonplasmainjectionwasbuilttoresearchtheinfluenceofkeyfactorssuchastriggervoltage,airpressure,gaplength,andoperatingcoefficientontheconductioncharacteristicsoftheSF6triggergaptriggeredbyenhancedplas-majet.Theresultsshowthatincreasingthetriggervoltagecansignificantlyimprovetheconductionprobabilityandreducethetriggerdelay,butthereisacertainsaturationphenomenon.Atafixedoperatingvoltage,withtheincreaseofairpressureorgaplength,theworkingcoefficientdecreasessignificantly,resultinginasuddenincreaseinthetriggerdelayanddramaticdecreaseintheconductionprobability.Atthesameworkingcoefficient,theconductioncharacteristicsoftheshortgapwithhighairpressureisstronger.Accordingly,itisproposedtomeettheextra-high-voltagehybridDCproject400kVflexiblebusrapidgroundingwithDC400kVgapswitch,toadoptthegapwithacompositejacketsingle-gapstructure,andtoadoptarotatingtriggercavitydesigntoachievemultipletriggering.Atriggergaptestprototype(gapdis-tance10cm,0.5MPaSF6)isdesigned,ofwhichthelightningwithstandvoltageisgreaterthan1250kV,thecriticaltriggervoltageislowerthan50kV,andthetriggerdelayisshorterthan0.5ms.TheresearchresultsprovideatheoreticalsupportandpreliminaryengineeringdesignschemefortheengineeringapplicationofmegavoltSF6triggergapforfastprotectionofflexibleDCvalvegroupinUHVhybridDCtransmissionsystem.
作者：李晓昂 邵奕凯 李志兵 张然 蒋攀 张乔根 Author：LIXiaoang SHAOYikai LIZhibing ZHANGRan JIANGPan ZHANGQiaogen
作者单位：西安交通大学电工材料电气绝缘全国重点实验室,西安710049中国电力科学研究院有限公司,北京100192
刊名：高电压技术 ISTICEIPKU
Journal：HighVoltageEngineering
年，卷(期)：2024, 50(6)
分类号：
关键词：SF6触发间隙 等离子体喷射 快速旁路开关 触发 工作系数
Keywords：SF6triggergap plasmainjection bypassswitch trigger workingcoefficient
机标分类号：TM773TB21TM561
在线出版日期：2024年7月19日
基金项目：特高压混合直流工程快速旁路保护用兆伏级SF6间隙等离子体喷射触发特性及工程设计[
期刊论文] 高电压技术--2024, 50(6)李晓昂 邵奕凯 李志兵 张然 蒋攀 张乔根在江苏白鹤滩±800kV特高压混合直流工程中,受端交流侧三相接地故障穿越失败时,会在±400kV柔直母线上产生高幅值过电压,严重威胁柔直阀组安全,而基于等离子体喷射的超快速旁路开关1ms内将柔直母线快速接地保护柔直阀组...参考文献和引证文献
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特高压混合直流工程快速旁路保护用兆伏级SF6间隙等离子体喷射触发特性及工程设计 Triggering Characteristics and Engineering Design of Megavoltage-grade SF6 Gap Plasma Injection for Fast Bypass Protection in Ultra-high Voltage Hybrid DC Projects
特高压混合直流工程快速旁路保护用兆伏级SF6间隙等离子体喷射触发特性及工程设计.pdf
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