气压和湿度对复合电压下换流阀高压电极起晕电压影响试验
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摘要
柔性直流换流阀在运行时,其内部尖端以及钳制电位差较大的相邻屏蔽罩可能由于承受过高的交直流复合电压和局部场强过大而产生电晕放电现象。而气压和湿度因素对起晕电压具有一定的影响。因此根据换流阀内部电极电场的特点设计了换流阀高压电极(棒–板电极和屏蔽罩缩比电极)。采用串联加压的复合加压方式和紫外成像技术,在实验室内搭建了气压和湿度可调的交直流复合电压电晕试验平台。之后基于试验平台研究了气压和湿度对复合电压下换流阀高压电极起晕电压的影响。试验结果表明:随着气压的下降,复合电压下和单一电压下棒–板电极的起晕电压均线性下降;复合电压下屏蔽罩缩比电极起晕电压逐渐下降;单一电压下屏蔽罩缩比电极的起晕电压线性下降。随着相对湿度的增大,正直流–交流复合电压下棒–板电极的起晕电压基本不变;负直流–交流复合电压下棒–板电极的起晕电压逐渐减小;单一电压下棒–板电极的起晕电压均逐渐线性减小。随着相对湿度的增大,正直流–交流复合电压下屏蔽罩缩比电极的起晕电压先减小后增大;负直流–交流复合电压下屏蔽罩缩比电极的起晕电压则逐渐减小;纯正直流电压下,屏蔽罩缩比电极的起晕电压先增大后减小;纯交流和纯负直流电压下,屏蔽罩缩比电极的起晕电压逐渐减小。
Inside a converter vale, the inner tip and the adjacent shield with larger clamping potential difference may cause corona discharge due to withstanding the excessive AC and DC composite voltage and exorbitant local field strength in the operation of the flexible DC converter valve. The air pressure and humidity have some influences on the corona inception voltage. Therefore, we designed a high voltage electrode of converter valve(rod-plate and shield shrink electrode) according to the characteristics of electrode electric field in converter valve. Moreover, we built an AC and DC composite voltage corona experimental platform with adjustable air pressure and humidity in the laboratory, which used the method of applying voltage in series and UV imaging technology. Then,we experimentally researched the effects of air pressure and humidity on the corona inception voltage of high voltage electrode in converter valve under the combined voltage based on experimental platform. The results show that the corona inception voltage of the rod-plane electrode decreases linearly under combined voltage and single voltage with the decrease of the pressure. The corona inception voltage of the scaled shield electrode decreases gradually under the combined voltage, when the air pressure drops. The corona onset voltage of the scaled shield electrode decreases linearly under single voltage. With the increase of relative humidity, the corona onset voltage of rod-plane remains unchanged under positive DC and AC composite voltage. The corona voltage of rod-plane electrode decreases under negative DC and AC composite voltage. The corona inception voltage of rod-plane electrode gradually decreases linearly under single voltage. The corona inception voltage of scaled shield electrode decreases first and then increases under positive DC and AC composite voltage. The corona inception voltage of scaled shield electrode decreases under negative DC and AC composite voltage. The corona inception voltage of scaled shield electrode increases first and then decreases under pure positive DC voltage. The corona inception voltage of scaled shield electrode decreases gradually under pure negative DC and pure AC voltage.
Inside a converter vale, the inner tip and the adjacent shield with larger clamping potential difference may cause corona discharge due to withstanding the excessive AC and DC composite voltage and exorbitant local field strength in the operation of the flexible DC converter valve. The air pressure and humidity have some influences on the corona inception voltage. Therefore, we designed a high voltage electrode of converter valve(rod-plate and shield shrink electrode) according to the characteristics of electrode electric field in converter valve. Moreover, we built an AC and DC composite voltage corona experimental platform with adjustable air pressure and humidity in the laboratory, which used the method of applying voltage in series and UV imaging technology. Then,we experimentally researched the effects of air pressure and humidity on the corona inception voltage of high voltage electrode in converter valve under the combined voltage based on experimental platform. The results show that the corona inception voltage of the rod-plane electrode decreases linearly under combined voltage and single voltage with the decrease of the pressure. The corona inception voltage of the scaled shield electrode decreases gradually under the combined voltage, when the air pressure drops. The corona onset voltage of the scaled shield electrode decreases linearly under single voltage. With the increase of relative humidity, the corona onset voltage of rod-plane remains unchanged under positive DC and AC composite voltage. The corona voltage of rod-plane electrode decreases under negative DC and AC composite voltage. The corona inception voltage of rod-plane electrode gradually decreases linearly under single voltage. The corona inception voltage of scaled shield electrode decreases first and then increases under positive DC and AC composite voltage. The corona inception voltage of scaled shield electrode decreases under negative DC and AC composite voltage. The corona inception voltage of scaled shield electrode increases first and then decreases under pure positive DC voltage. The corona inception voltage of scaled shield electrode decreases gradually under pure negative DC and pure AC voltage.
引文
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[21]陈澜,卞星明,陈枫林,等.电晕笼内导线交流电晕起始电压判断方法[J].高电压技术,2011,37(1):85-90.CHEN Lan,BIAN Xingming,CHEN Fenglin,et al.Method to judge corona inception voltage of AC transmission lines using corona cage[J].High Voltage Engineering,2011,37(1):85-90.
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[23]万树伟,卞星明,王晓川,等.极不均匀场中正直流电晕放电紫外特性的研究[J].高压电器,2015,51(2):8-17.WAN Shuwei,BIAN Xingming,WANG Xiaochuan,et al.UV characteristics of positive DC corona discharge in extremely non-uniform field[J].High Voltage Apparatus,2015,51(2):8-17.
[24]黄文武,贺振华,蔡炜,等.基于紫外成像技术的棒-板间隙放电环境因素研究[J].高电压技术,2015,41(8):2788-2794.HUANG Wenwu,HE Zhenhua,CAI Wei,et al.Study on environmental factors of rod-plane discharge based on UV imaging[J].High Voltage Engineering,2015,41(8):2788-2794.
[25]马斌,周文俊,汪涛,等.基于紫外成像技术的极不均匀电场电晕放电[J].高电压技术,2006,32(7):13-16.MA Bin,ZHOU Wenjun,WANG Tao,et al.Corona discharge of the severe non uniform electric field based on the UV light imaging technology[J].High Voltage Engineering,2006,32(7):13-16.
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[30]齐波,高春嘉,赵林杰,等.交/直流电压下气体绝缘变电站盆式绝缘子表面电荷对闪络电压的影响[J].高电压技术,2017,43(3):915-922.QI Bo,GAO Chunjia,ZHAO Linjie,et al.Influence of surface charge on flashover voltage of gas insulated substation basin insulator under AC and DC voltage[J].High Voltage Engineering,2017,43(3):915-922.
[2]刘振亚.特高压电网[M].北京:中国经济出版社,2005:136-139.LIU Zhenya.Ultra-high voltage grid[M].Beijing,China:China Economic Press,2005:136-139.
[3]张文亮,于永清,李光范,等.特高压直流输电技术研究[J].中国电机工程学报,2007,27(22):1-7.ZHANG Wenliang,YU Yongqing,LI Guangfan,et al.Researches on UHVDC technology[J].Proceedings of the CSEE,2007,27(22):1-7.
[4]梁旭明,张平,常勇.高压直流输电技术现状及发展前景[J].电网技术,2012,36(4):1-9.LIANG Xuming,ZHANG Ping,CHANG Yong.Recent advances in high-voltage direct-current power transmission and its developing potential[J].Power System Technology,2012,36(4):1-9.
[5]齐磊,李超,王星星,等.柔性高压直流输电系统换流阀塔交流电场仿真计算[J].高电压技术,2014,40(11):3537-3543.QI Lei,LI Chao,WANG Xingxing,et al.Simulation calculation of ACelectric field for valve tower of flexible HVDC transmission system[J].High Voltage Engineering,2014,40(11):3537-3543.
[6]卞星明,惠建峰,黄海鲲,等.负直流电晕流注脉冲特性随气压和湿度变化的规律[J].中国电机工程学报,2010,30(10):134-142.BIAN Xingming,HUI Jianfeng,HUANG Haikun,et al.Variation ofthe characteristics of negative DC corona streamer pulse with air pressure and humidity[J].Proceedings of the CSEE,2010,30(10):134-142.
[7]BIAN X M,MENG X B,WANG L M,et al.Negative corona inception voltages in rod-plane gaps at various air pressures and humidities[J].IEEE Transactions on Dielectrics and Electrical Insulation,2011,18(2):613-619.
[8]卞星明,惠建峰,黄海鲲,等.气压和湿度对正直流电晕流注脉冲特性的影响[J].高电压技术,2009,35(10):2371-2382.BIAN Xingming,HUI Jianfeng,HUANG Haikun,et al.Influence of air pressure and humidity on positive DC corona streamer pulse characteristics[J].High Voltage Engineering,2009,35(10):2371-2382.
[9]惠建峰,关志成,王黎明,等.正直流电晕特性随气压和湿度变化的研究[J].中国电机工程学报,2007,27(33):53-58.HUI Jianfeng,GUAN Zhicheng,WANG Liming,et al.Research on variation of positive DC corona characteristics with air pressure and humidity[J].Proceedings of the CSEE,2007,27(33):53-58.
[10]BIAN X M,HUI J F,CHEN Y,et al.Positive corona inception voltages and corona currents for air at various pressures and humidities[J].IEEE Transactions on Dielectrics and Electrical Insulation,2010,17(1):63-70.
[11]孟晓波,惠剑锋,卞星明,等.交流电晕脉冲特性随气压和湿度变化的规律[J].中国电机工程学报,2011,31(28):128-135.MENG Xiaobo,HUI Jianfeng,BIAN Xingming,et al.Variation of ACcorona discharge pulse characteristics with air pressure and humidity[J].Proceedings of the CSEE,2011,31(28):128-135.
[12]BOUTLENDJ M,ALLEN N L,LIGHTFOOT H A,et al.Positive dc corona and sparkover in short and long rod-plane gaps under variable humidity conditions[J].IEE Proceedings-A,1991,138(1):31-36.
[13]ABDEL-SALAM M.Influence of humidity on charge density and electric field in electrostatic precipitators[J].Journal of Physics D:Applied Physics,1992,25(5):760-766.
[14]张静岚,符瑜科,卢铁兵,等.交直流复合电压下棒-板电极起晕电压实验分析[J].电工技术学报,2017,32(4):180-188.ZHANG Jinglan,FU Yuke,LU Tiebing,et al.Experimental analysis on corona inception voltage of rod-plane air gaps under DC and ACcomposite voltage[J].Transactions of China Electrotechnical Society,2017,32(4):180-188.
[15]朱正一,李锐海,王国利,等.交直流复合电压下电晕放电实验研究[J].高电压技术,2012,38(8):2001-2007.ZHU Zhengyi,LI Ruihai,WANG Guoli,et al.Experiments on corona discharge under AC and DC composite voltage[J].High Voltage Engineering,2012,38(8):2001-2007.
[16]齐磊,张静岚,符瑜科,等.交直流复合电压下的稍不均匀场高压电极起晕特性[J].高电压技术,2017,43(9):2991-2997.QI Lei,ZHANG Jinglan,FU Yuke,et al.Experimental study on corona onset characteristics for electrodes of slightly non-uniform electric field under composite AC-DC voltage[J].High Voltage Engineering,2017,43(9):2991-2997.
[17]齐波,魏振,高怡,等.不同比例交直流复合电场作用下油纸绝缘内部气隙放电的特征[J].中国电机工程学报,2015,35(12):3161-3169.QI Bo,WEI Zhen,GAO Yi,et al.Discharge characteristics of internal gas-gap defect in oil-paper insulation under different proportion of ACand DC combined voltages[J].Proceedings of the CSEE,2015,35(12):3161-3169.
[18]齐波,魏振,李成榕,等.交直流叠加电压作用下油纸绝缘内部气隙放电发展过程[J].中国电机工程学报,2014,34(36):6554-6561.QI Bo,WEI Zhen,LI Chengrong,et al.Development of discharge of internal gas-gap defect in oil-paper insulation under AC and DC combined voltage[J].Proceedings of the CSEE,2014,34(36):6554-6561.
[19]齐波,魏振,李成榕,等.交流与直流电压比例对油纸绝缘内部气隙放电特性影响分析[J].中国电机工程学报,2015,35(1):247-254.QI Bo,WEI Zhen,LI Chengrong,et al.Influences of ratios of AC and DC voltages on partial discharge characteristics of gas cavity in oil-pressboard insulation[J].Proceedings of the CSEE,2015,35(1):247-254.
[20]金福宝,周远翔,黄建文,等.温度对交直流复合电场下油纸绝缘沿面放电特性的影响[J].高电压技术,2017,43(3):931-939.JIN Fubao,ZHOU Yuanxiang,HUANG Jianwen,et al.Effects of temperature on creepage discharge characteristics of paper-oil insulation under combined AC-DC voltage[J].High Voltage Engineering,2017,43(3):931-939.
[21]陈澜,卞星明,陈枫林,等.电晕笼内导线交流电晕起始电压判断方法[J].高电压技术,2011,37(1):85-90.CHEN Lan,BIAN Xingming,CHEN Fenglin,et al.Method to judge corona inception voltage of AC transmission lines using corona cage[J].High Voltage Engineering,2011,37(1):85-90.
[22]王黎明,万树伟,卞星明,等.极不均匀电场中负直流电晕放电紫外特性[J].高电压技术,2014,40(6):1614-1622.WANG Liming,WAN Shuwei,BIAN Xingming,et al.Ultraviolet characteristics of negative DC corona discharge in extremely non-uniform electric field[J].High Voltage Engineering,2014,40(6):1614-1622.
[23]万树伟,卞星明,王晓川,等.极不均匀场中正直流电晕放电紫外特性的研究[J].高压电器,2015,51(2):8-17.WAN Shuwei,BIAN Xingming,WANG Xiaochuan,et al.UV characteristics of positive DC corona discharge in extremely non-uniform field[J].High Voltage Apparatus,2015,51(2):8-17.
[24]黄文武,贺振华,蔡炜,等.基于紫外成像技术的棒-板间隙放电环境因素研究[J].高电压技术,2015,41(8):2788-2794.HUANG Wenwu,HE Zhenhua,CAI Wei,et al.Study on environmental factors of rod-plane discharge based on UV imaging[J].High Voltage Engineering,2015,41(8):2788-2794.
[25]马斌,周文俊,汪涛,等.基于紫外成像技术的极不均匀电场电晕放电[J].高电压技术,2006,32(7):13-16.MA Bin,ZHOU Wenjun,WANG Tao,et al.Corona discharge of the severe non uniform electric field based on the UV light imaging technology[J].High Voltage Engineering,2006,32(7):13-16.
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