线形金属微粒对SF_6局部放电含硫分解组分的影响
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摘要
电网中以穿墙套管为代表的六氟化硫(SF_6)直流气体绝缘设备中,不可避免存在的自由线形金属微粒缺陷会使电场发生畸变,产生局部放电(PD),进而导致事故发生。为了进一步了解直流PD下,自由线形金属微粒缺陷产生的PD对SF_6绝缘气体分解特性的影响,论文在搭建的高压直流PD实验平台上,以不同直径、不同形状尺寸的线形金属微粒产生稳定的PD进行了SF_6分解试验,并利用质谱联用仪定量测定放电室内含硫特征组分体积分数,获取了PD下3种SF_6含硫特征分解组分(SO_2F_2、SOF_2和SO_2)的生成规律。结果表明:在直径的影响下,3种含硫组分气体的体积分数和总体积分数均随时间增长,但产气速率趋势大不相同;其有效产气速率大小按直径排序均为0.3 mm>0.4 mm>0.5 mm>0.6 mm;含硫分解组分总体积分数在PD时间进行到24 h后,呈现出线形微粒>薄片状微粒>球状微粒的现象。自由线形金属微粒缺陷对直流气体绝缘设备含硫特征分解组分影响显著,且与直径有着明显的相关性,这可以为完善直流气体绝缘设备的故障诊断和在线监测技术提供参考。
Free wire-type metal particles within SF_6 direct current(DC) gas-insulated equipment, represented by the wall bushing in the whole power system, greatly threaten the insulation system by distorting the electric field and inducing partial discharge(PD), and easily lead to accidents. In order to investigate the influence of free wire-type metal particles on SF_6 decomposition characteristics under HVDC, we established an HVDC experimental platform to carry out SF_6 decomposition tests under stable PD, which was generated by using a ball-bowl electrode with different diameters, shape and size of the metal particles. And the volume fractions of three SF_6 characteristic decomposition components(SO_2 F_2,SOF_2 and SO_2) were tested by gas chromatography mass spectrometer(GC/MS) to obtain the main features of these components under different diameters of free wire-type metal particles. The experimental results show that the volume fraction and total formation of the three SF_6 characteristic decomposition components increase with time, but the trend of formation rates is different. The effective formation rates of the three sulfur-containing gases are ranked by diameters as follows: 0.3 mm>0.4 mm>0.5 mm>0.6 mm. After 24 hours, and the rates of total volume fractions of the three SF_6 characteristic decomposition components are in following sequences: the wire-type particles>lamellar particles>spherical particles. The free wire-type metal particle defects have a significant impact on the sulfur-containing characteristic decomposition components of DC gas insulation equipment and are correlated with diameters. The results can provide references for improving the technology of DC gas-insulated equipment fault diagnosis and condition monitoring.
Free wire-type metal particles within SF_6 direct current(DC) gas-insulated equipment, represented by the wall bushing in the whole power system, greatly threaten the insulation system by distorting the electric field and inducing partial discharge(PD), and easily lead to accidents. In order to investigate the influence of free wire-type metal particles on SF_6 decomposition characteristics under HVDC, we established an HVDC experimental platform to carry out SF_6 decomposition tests under stable PD, which was generated by using a ball-bowl electrode with different diameters, shape and size of the metal particles. And the volume fractions of three SF_6 characteristic decomposition components(SO_2 F_2,SOF_2 and SO_2) were tested by gas chromatography mass spectrometer(GC/MS) to obtain the main features of these components under different diameters of free wire-type metal particles. The experimental results show that the volume fraction and total formation of the three SF_6 characteristic decomposition components increase with time, but the trend of formation rates is different. The effective formation rates of the three sulfur-containing gases are ranked by diameters as follows: 0.3 mm>0.4 mm>0.5 mm>0.6 mm. After 24 hours, and the rates of total volume fractions of the three SF_6 characteristic decomposition components are in following sequences: the wire-type particles>lamellar particles>spherical particles. The free wire-type metal particle defects have a significant impact on the sulfur-containing characteristic decomposition components of DC gas insulation equipment and are correlated with diameters. The results can provide references for improving the technology of DC gas-insulated equipment fault diagnosis and condition monitoring.
引文
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[8]吴超.直流GIL中气体间隙和绝缘子绝缘特性研究[D].成都:西南交通大学,2009.WU Chao.Study on insulation characteristics of the GAS-GAP and the insulator in DC GIL[D].Chengdu,China:Southwest Jiaotong University,2009.
[9]李庆民,刘思华,王健,等.直流气体绝缘线路中自由金属微粒的局部放电特性与影响因素[J].高电压技术,2017,43(2):367-374.LI Qingmin,LIU Sihua,WANG Jian,et al.Characteristics of partial discharges caused by free metal particle and influencing factors in DCgas insulated line[J].High Voltage Engineering,2017,43(2):367-374.
[10]张晓星,姚尧,唐炬,等.导电微粒局部放电下SF6分解组分色谱信号的曲线拟合分峰[J].电工技术学报,2010,25(7):179-185.ZHANG Xiaoxing,YAO Yao,TANG Ju,et al.Separating overlapped chromatogram signals of SF6 decomposed products under PD of conductive particles based on curve-Fitting[J].Transactions of China Electrotechnical Society,2010,25(7):179-185.
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[12]肖华,刘圣辉.一起220 kV GIS内部微粒放电引起母线跳闸的原因分析[J].电气安全,2015,34(9):76-78.XIAO Hua,LIU Shenghui.Analysis on the cause of bus trip caused by particle discharge in 220 kV GIS[J].Electric Safety,2015,34(9):76-78.
[13]唐念,杨东,周永言,等.不同气压下两种缺陷的SF6负极性直流局部放电分解特性[J].高电压技术,2018,44(9):2911-2916.TANG Nian,YANG Dong,ZHOU Yongyan,et al.Decomposition characteristics of SF6 at negative DC partial discharge by two typical defects under different pressure[J].High Voltage Engineering,2018,44(9):2911-2916.
[14]王健,李庆民,李泊涛,等.直流GIL中自由线形金属微粒的运动与放电特性[J].中国电机工程学报,2016,36(17):4793-4801.WANG Jian,LI Qingmin,LI Botao,et al.Motion and discharge behavior of the free conducting wire-type particle within DC GIL[J].Proceedings of the CSEE,2016,36(17):4793-4801.
[15]电力设备预防性实验规程:DL/T 596-2005[S],2005.Preventive test code for electric power equipment:DL/T596-2005[S],2005.
[16]Guidelines for the checking and treatment of sulfur hexafluoride(SF6)taken from electrical equipment and specification for its reuse:IEC60480-2005[S],2005.
[17]High voltage test techniques partial discharge measurements:IECInternational Standard 60270[S],2000.
[18]TANG J,ZENG F,PAN J,et al.Correlation analysis between formation process of SF6 decomposed components and partial discharge qualities[J].IEEE Transactions on Dielectrics and Electrical Insulation,2013,20(3):864-875.
[2]钟建英,柴影辉,王赛豪,等.±1 100 kV直流纯SF6气体绝缘穿墙套管关键技术研究[J].电力建设,2017,38(10):129-137.ZHONG Jianying,CHAI Yinghui,WANG Saihao,et al.Key technology of±1 100 kV DC pure SF6 insulated wall bushing[J].Electric Power Construction,2017,38(10):129-137.
[3]唐炬,黄江岸,张晓星,等.局部放电在线监测中混频周期性窄带干扰的抑制[J].中国电机工程学报,2010,30(13):121-127.TANG Ju,HUANG Jiangan,ZHANG Xiaoxing,et al.Suppression of the periodic narrow-band noise with mixed frequencies in PD on-line monitoring[J].Proceedings of the CSEE,2010,30(13):121-127.
[4]张乔根,贾江波,杨兰均,等.气体绝缘系统电极表面覆膜时金属导电微粒带电原因分析[J].西安交通大学学报,2004,38(12):1287-1291.ZHANG Qiaogen,JIA Jiangbo,YANG Lanjun,et al.Charging mechanism of metallic conducting particle on a dielectrically coated electrode in gas insulated system[J].Journal of Xi’an Jiaotong University,2004,38(12):1287-1291.
[5]张乔根,游浩洋,马径坦,等.直流电压下SF6中自由线形导电微粒运动特性[J].高电压技术,2018,44(3):696-703.ZHANG Qiaogen,YOU Haoyang,MA Jingtan,et al.Motion behavior of free conducting wire-type particles in SF6 gas under DC voltage[J].High Voltage Engineering,2018,44(3):696-703.
[6]肖淞,张晓星,周倩,等.不同类型自由金属微粒对SF6绝缘特性的影响[J].中国电机工程学报,2018,38(5):1582-1591.XIAO Song,ZHANG Xiaoxing,ZHOU Qian,et al.Influence of different types of free metal particles on the properties of SF6insulation[J].Proceedings of the CSEE,2018,38(5):1582-1591.
[7]HATTORI T,HONDA M,AOYAGI H,et al.A study on effects of conducting particles in SF6 gas and test methods for GIS[J].IEEETransactions on Power Delivery,1988,3(1):197-204.
[8]吴超.直流GIL中气体间隙和绝缘子绝缘特性研究[D].成都:西南交通大学,2009.WU Chao.Study on insulation characteristics of the GAS-GAP and the insulator in DC GIL[D].Chengdu,China:Southwest Jiaotong University,2009.
[9]李庆民,刘思华,王健,等.直流气体绝缘线路中自由金属微粒的局部放电特性与影响因素[J].高电压技术,2017,43(2):367-374.LI Qingmin,LIU Sihua,WANG Jian,et al.Characteristics of partial discharges caused by free metal particle and influencing factors in DCgas insulated line[J].High Voltage Engineering,2017,43(2):367-374.
[10]张晓星,姚尧,唐炬,等.导电微粒局部放电下SF6分解组分色谱信号的曲线拟合分峰[J].电工技术学报,2010,25(7):179-185.ZHANG Xiaoxing,YAO Yao,TANG Ju,et al.Separating overlapped chromatogram signals of SF6 decomposed products under PD of conductive particles based on curve-Fitting[J].Transactions of China Electrotechnical Society,2010,25(7):179-185.
[11]唐炬,赵天成,姚强,等.气压对SF6局部过热分解的影响特性[J].高电压技术,2018,44(5):1520-1527.TANG Ju,ZHAO Tiancheng,YAO Qiang,et al.Influence characteristics of pressure on the partial over-thermal decomposition of SF6[J].High Voltage Engineering,2018,44(5):1520-1527.
[12]肖华,刘圣辉.一起220 kV GIS内部微粒放电引起母线跳闸的原因分析[J].电气安全,2015,34(9):76-78.XIAO Hua,LIU Shenghui.Analysis on the cause of bus trip caused by particle discharge in 220 kV GIS[J].Electric Safety,2015,34(9):76-78.
[13]唐念,杨东,周永言,等.不同气压下两种缺陷的SF6负极性直流局部放电分解特性[J].高电压技术,2018,44(9):2911-2916.TANG Nian,YANG Dong,ZHOU Yongyan,et al.Decomposition characteristics of SF6 at negative DC partial discharge by two typical defects under different pressure[J].High Voltage Engineering,2018,44(9):2911-2916.
[14]王健,李庆民,李泊涛,等.直流GIL中自由线形金属微粒的运动与放电特性[J].中国电机工程学报,2016,36(17):4793-4801.WANG Jian,LI Qingmin,LI Botao,et al.Motion and discharge behavior of the free conducting wire-type particle within DC GIL[J].Proceedings of the CSEE,2016,36(17):4793-4801.
[15]电力设备预防性实验规程:DL/T 596-2005[S],2005.Preventive test code for electric power equipment:DL/T596-2005[S],2005.
[16]Guidelines for the checking and treatment of sulfur hexafluoride(SF6)taken from electrical equipment and specification for its reuse:IEC60480-2005[S],2005.
[17]High voltage test techniques partial discharge measurements:IECInternational Standard 60270[S],2000.
[18]TANG J,ZENG F,PAN J,et al.Correlation analysis between formation process of SF6 decomposed components and partial discharge qualities[J].IEEE Transactions on Dielectrics and Electrical Insulation,2013,20(3):864-875.