金属微粒和臭氧处理对GIS用盆式绝缘子闪络电压的影响
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摘要
在SF6气氛中研究金属微粒和臭氧处理对110 kV气体绝缘金属封闭开关(GIS)盆式绝缘子闪络电压的影响。结果表明:绝缘子沿着附着在其表面上的金属微粒发生闪络,闪络痕迹明显。绝缘子未经处理时,闪络电压随金属微粒长度的增加而迅速下降。金属微粒长度增加到8 mm时,闪络电压下降趋势变缓。金属微粒靠近中心导体时,其对绝缘子闪络电压的影响较大。距中心导体0 mm时,闪络电压最小。臭氧处理后的绝缘子与未处理的绝缘子呈现出相似的闪络特性,但处理后的绝缘子闪络电压提高了约18.5%。臭氧处理可以改善绝缘子表面的陷阱特性,加快绝缘子表面电荷消散速率,提高绝缘子的闪络电压。550 k V正极性雷电冲击波无法检测出微小金属微粒的存在,也无法检测出靠近中心导体或稍远区域金属微粒的存在。
The effects of metallic particle and ozone treatment on the flashover voltage of basin insulator for 110 kV gas insulated metal-enclosed switchgear(GIS) were studied in the atmosphere of SF_6. The results show that flashover occurs along the metallic particles which are attached on basin insulator surface, and there is obvious burning trace. Before ozone treatment, the flashover voltage of insulator decreases rapidly with the increase of metallic particle length. When the metallic particle length increases to 8 mm, the flashover voltage decreases slowly. When the metallic particle is close to the center conductor of insulator, it has great influence on the flashover voltage, and the flashover voltage is low when the metallic particle is 0 mm away from the center conductor. The flashover characteristic of the insulator after ozone treatment is similar to the untreated insulator, while the flashover voltage increases by 18.5%after treatment. The ozone treatment can improve the surface trap characteristics of insulator and accelerate the dissipation of surface charge, so the flashover voltage of insulator increases. Tiny metallic particles and metallic particles close to or far away from the center conductor are undetectable under 550 k V standard lightning impulse(SLI).
The effects of metallic particle and ozone treatment on the flashover voltage of basin insulator for 110 kV gas insulated metal-enclosed switchgear(GIS) were studied in the atmosphere of SF_6. The results show that flashover occurs along the metallic particles which are attached on basin insulator surface, and there is obvious burning trace. Before ozone treatment, the flashover voltage of insulator decreases rapidly with the increase of metallic particle length. When the metallic particle length increases to 8 mm, the flashover voltage decreases slowly. When the metallic particle is close to the center conductor of insulator, it has great influence on the flashover voltage, and the flashover voltage is low when the metallic particle is 0 mm away from the center conductor. The flashover characteristic of the insulator after ozone treatment is similar to the untreated insulator, while the flashover voltage increases by 18.5%after treatment. The ozone treatment can improve the surface trap characteristics of insulator and accelerate the dissipation of surface charge, so the flashover voltage of insulator increases. Tiny metallic particles and metallic particles close to or far away from the center conductor are undetectable under 550 k V standard lightning impulse(SLI).
引文
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[15]于开坤,张冠军,穆海宝,等.表面层处理对可加工陶瓷真空沿面闪络特性的影响[J].电工技术学报,2012,27(5):115-121.
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[19]李昂.基于高压直流GIS盆式绝缘子基材的环氧树脂表面电荷积累与抑制方法研究[D].天津:天津大学,2017.
[20]周天春,CHEN G,廖瑞金.高压聚合物材料电荷陷阱模型及参数[C]//中国电机工程学会第十一届青年学术会议.北京,2010:225-230.
[2]HASEGAWA T,YAMAJI K,HATANO M,et al.Development of insulation structure and enhancement of insulation reliability of 500kV DC GIS[J].IEEE Transactions on Power Delivery,1997,12(1):194-202.
[3]李超,陶蓉.一起126kV GIS设备故障后的检测实例分析[J].高压电器,2013,51(1):145-149.
[4]朱时阳,邓雨荣,兰国良.一起GIS盆式绝缘子闪络事故的分析[J].电气应用,2009,28(13):38-39.
[5]耿弼博.220kV GIS盆式绝缘子表面电荷累积与消散特性的研究[D].北京:华北电力大学,2012.
[6]齐波,李成榕,郝震.GIS绝缘子表面固定金属颗粒沿面局部放电发展的现象及其特征[J].中国电机工程学报,2011,31(1):101-108.
[7]LI Yan,QU Shiliang.The effects of heat treatment on microfluidic devices fabricated in silica glass by femtosecond lasers[J].Chinese Physics B,2012,21(3):034208.
[8]FUJII G,OHKUBO M,UKIBE M.Characteristics of Nb/Al superconducting tunnel junctions fabricated using ozone gas[J].Chinese Physics B,2015,24(9):093301.
[9]李昂,杜伯学,徐航,等.表层氟化环氧纳米复合材料表面的电荷动态特性[J].高电压技术,2015,41(2):410-416.
[10]MOHAMAD A,CHEN G,ZHANG Y,et al.Surface fluorinated epoxy resin for high voltage DC application[J].IEEE Transactions on Dielectrics and Electrical Insulation,2015,22(1):101-108.
[11]林生军,黄印,闵道敏,等.电子束辐照对环氧微米复合介质表面陷阱特性和表面电导的影响[J].绝缘材料,2016,49(12):55-61.
[12]GANGA S,NAGESHWAR R B,DWARKANATH K.Studies on electric field enhancement due to presence of conducting particle on an insulating spacer as related to GIS[C]//2000 IEEE International Symposium on Electrical Insulation.Anaheim,USA:IEEE,2000:300-303.
[13]陈济.导电微粒对绝缘子表面电场和电荷积聚影响的研究[D].北京:华北电力大学,2006.
[14]吕金壮,李成榕,丁立健,等.陷阱分布对Al2O3陶瓷介质在真空中沿面闪络特性的而影响[J].中国电机工程学报,2003,23(2):77-81.
[15]于开坤,张冠军,穆海宝,等.表面层处理对可加工陶瓷真空沿面闪络特性的影响[J].电工技术学报,2012,27(5):115-121.
[16]Miller H C,EDWARD J F.The effect of Mn/Ti surface treatment on voltage-hold off performance of alumina insulators in vacuum[J].Journal of Applied Physics,1978,49(11):5416-5420.
[17]SIMMONS J G,TAM M C.Theory of isothermal currents and the direct determination of trap parameters in semiconductors and insulators containing arbitrary trap distributions[J].Physical Review B,1973,7(8):3706-3713.
[18]SIMMONS J G,TAYLOR G W,TAM M C.Thermally stimulated currents in semiconductors and insulators having arbitrary trap distributions[J].Physical Review B,1973,7(8):3714-3719.
[19]李昂.基于高压直流GIS盆式绝缘子基材的环氧树脂表面电荷积累与抑制方法研究[D].天津:天津大学,2017.
[20]周天春,CHEN G,廖瑞金.高压聚合物材料电荷陷阱模型及参数[C]//中国电机工程学会第十一届青年学术会议.北京,2010:225-230.