负极性直流局部放电下SF_6分解特性
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摘要
为了获取和掌握不同类型负极性直流局部放电(PD)下SF_6气体绝缘介质的分解特性,利用SF_6直流PD分解实验平台,对自制的4种典型绝缘缺陷模型(金属突出物、自由导电微粒、绝缘子表面污秽和绝缘子气隙)进行PD实验。结果表明:4种绝缘缺陷引起的负极性直流PD均会使SF_6分解生成CF_4、CO_2、SO_2F_2、SOF_2和SO_2等5种稳定组分,SF_6分解组分的含量、有效产气速率和含量比值与PD类型之间均存在一定关联;在4种缺陷下,以c(SOF_2+SO_2)/c(SO_2F_2)、ln(c(CO_2)/c(CF_4))和c(SOF_2+SO_2F_2+SO_2)/c(CF_4+CO_2)作为特征量,区别较为明显,且特征比值曲线没有出现任何交叉,因此适合识别不同类型的绝缘缺陷。
In order to obtain and master the decomposition characteristics of SF_6 insulating gas under different types of negative DC partial discharge(PD), four typical types of artificial insulation defect models(metal protrusion, free conductive particles, surface pollution on insulator, and air gap in insulator)were conducted PD experiments on DC PD decomposition experiment platform of SF_6. The results show that all the negative DC PD caused by the four insulation defects can make SF_6 decompose to five stable components including CF_4, CO_2, SO_2F_2, SOF_2, and SO_2. There are some relevance among the content of SF_6 decomposition components, effective gas production rate, concentration ratio, and PD types. The four defects have obvious distinction using c(SOF_2+ SO_2)/c(SO_2F_2), ln(c(CO_2)/c(CF_4)), and c(SOF_2+ SO_2F_2+SO_2)/c(CF_4+CO_2) as characteristic variables, and there is any crossover on the characteristic ratio curves.Therefore, the three characteristic variables are suitable to identify different types of insulation defects.
In order to obtain and master the decomposition characteristics of SF_6 insulating gas under different types of negative DC partial discharge(PD), four typical types of artificial insulation defect models(metal protrusion, free conductive particles, surface pollution on insulator, and air gap in insulator)were conducted PD experiments on DC PD decomposition experiment platform of SF_6. The results show that all the negative DC PD caused by the four insulation defects can make SF_6 decompose to five stable components including CF_4, CO_2, SO_2F_2, SOF_2, and SO_2. There are some relevance among the content of SF_6 decomposition components, effective gas production rate, concentration ratio, and PD types. The four defects have obvious distinction using c(SOF_2+ SO_2)/c(SO_2F_2), ln(c(CO_2)/c(CF_4)), and c(SOF_2+ SO_2F_2+SO_2)/c(CF_4+CO_2) as characteristic variables, and there is any crossover on the characteristic ratio curves.Therefore, the three characteristic variables are suitable to identify different types of insulation defects.
引文
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[2]王继宗.与六氟化硫电孤分解生成物有关的若干问题[J].绝缘材料,1979,12(4):39-55,81.
[3]梁方建,王钰,王志龙,等.六氟化硫气体在电力设备中的应用现状及问题[J].绝缘材料,2010,43(3):43-46.
[4]CASANOVAS A M,CASANOVAS J,LAGARDE F.Study of the decomposition of SF6under DC negative polarity corona discharges(point-to-plane geometry):Influence of the metal constituting the plane electrode[J].Journal of Applied Physics,1992,72(8):3344-3354.
[5]BELMADANI B,CASANOVAS J,CASANOVAS A M.SF6decomposition under power arcs.II.Chemical aspects[J].IEEE Transactions on Electrical Insulation,1991,26(6):1177-1182.
[6]SAUERS I,ELLIS H W,CHRISTOPHOROU L G.Neutral decomposition products in spark breakdown of SF6[J].IEEETransactions on Electrical Insulation,1986,EI-21(2):111-120.
[7]唐炬,李涛,胡忠,等.两种常见局部放电缺陷模型的SF6气体分解组份对比分析[J].高电压技术,2009,35(3):487-492.
[8]TANG J,LIU F,ZHANG X X,et al.Partial discharge recognition through an analysis of SF6decomposition products part 1:Decomposition characteristics of SF6under four different partial discharges[J].IEEE Transactions on Dielectrics and Electrical Insulation,2012,19(1):29-36.
[9]TANG J,LIU F,MENG Q H,et al.Partial discharge recognition through an analysis of SF6decomposition products part 2:Feature extraction and decision tree-based pattern recognition[J].IEEE Transactions on Dielectrics and Electrical Insulation,2012,19(1):37-44.
[10]BOGGS S A,STONE C.Fundamental limitations in the measurement of corona and partial discharge[J].IEEETransactions on Electrical Insulation,1982,EI-17(2):143-150.
[11]AUGER P,POGGIALE J C.Emergence of population growth models:Fast migration and slow growth[J].Journal of Theoretical Biology,1996,182(2):99-108.
[12]SIBLY R M,BARKER D,DENHAM M C,et al.On the stability of populations of mammals,birds,fish and insects[J].Ecology Letters,2007,10(10):970-976.