自动重合闸期间电流互感器剩磁抑制研究
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摘要
P级电流互感器广泛用于330kV及以下电力系统,由于其暂态性能差,在铁心中留存大量剩磁。随着电网短路水平增大,电流互感器更易饱和,造成与之相连的继电保护误动。为此,该文提出一种适用于自动重合闸期间的电流互感器剩磁快速抑制方法。该方法由连接在电流互感器二次侧的剩磁抑制电路实现,通过控制开关模块输出电压的极性来逐渐减小铁心的磁通。给出剩磁抑制电路中开关模块输出电压反转次数、直流电压值以及限流电阻的选择方法。利用典型电流互感器参数及其在自动重合闸期间的动态模拟实验数据,进行不同剩磁极性、不同短路电流情况下的测试,结果显示所提出的剩磁抑制方法及其抑制电路是可行的、快速的,并且性能优越。
P-class current transformer(CT) is widely used in 330 k V and below power system, but due to the poor transient performance, a large amount of residual flux is retained in the CT core. With the increase of short-circuit level of power system, the current transformer is more saturated,resulting in maloperation of relay protection connected to it.Therefore, a fast suppression method of CT residual flux for automatic reclosing was proposed in this paper. The method was realized by a residual flux suppression circuit connected to the CT secondary side, and the magnetic flux of core was gradually reduced by controlling the polarity of switch module output voltage. Furthermore, the selection methods of reversal times of switch module output voltage, DC voltage, and current limiting resistance in residual flux suppression circuit were also given in this paper. Finally, the typical current transformer parameters and their dynamic simulation experimental data during automatic reclosing were used for simulation tests under different residual flux polarity and different short circuit current. The results show that the proposed residual flux suppression method and its suppression circuit are feasible, fast,and superior in performance.
P-class current transformer(CT) is widely used in 330 k V and below power system, but due to the poor transient performance, a large amount of residual flux is retained in the CT core. With the increase of short-circuit level of power system, the current transformer is more saturated,resulting in maloperation of relay protection connected to it.Therefore, a fast suppression method of CT residual flux for automatic reclosing was proposed in this paper. The method was realized by a residual flux suppression circuit connected to the CT secondary side, and the magnetic flux of core was gradually reduced by controlling the polarity of switch module output voltage. Furthermore, the selection methods of reversal times of switch module output voltage, DC voltage, and current limiting resistance in residual flux suppression circuit were also given in this paper. Finally, the typical current transformer parameters and their dynamic simulation experimental data during automatic reclosing were used for simulation tests under different residual flux polarity and different short circuit current. The results show that the proposed residual flux suppression method and its suppression circuit are feasible, fast,and superior in performance.
引文
[1]李长云,李庆民,李贞,等.直流偏磁条件下电流互感器的传变特性[J].中国电机工程学报,2010,30(19):127-132.Li Changyun,Li Qingmin,Li Zhen,et al.Transformer characteristics of current transformers with DC bias[J].Proceedings of the CSEE,2010,30(19):127-132(in Chinese).
[2]Stanbury M,Djekic Z.The impact of current-transformer saturation on transformer differential protection[J].IEEETransactions on Power Delivery,2015,30(3):1278-1287.
[3]毕大强,冯存亮,葛宝明.电流互感器局部暂态饱和识别的研究[J].中国电机工程学报,2012,32(31):184-190.Bi Daqiang,Feng Cunliang,Ge Baoming.Research on identification of partial transient saturation in current transformer[J].Proceedings of the CSEE,2012,32(31):184-190(in Chinese).
[4]刘益青,高伟聪,王成友,等.基于差电流半周积分特征的电流互感器饱和识别方法[J].电网技术,2016,40(9):2889-2896.Liu Yiqing,Gao Weicong,Wang Chengyou,et al.Current transformer saturation recognition method based on the differential current and a half weeks integral characteristics[J].Power System Technology,2016,40(9):2889-2896(in Chinese).
[5]Haghjoo F,Pak M H.Compensation of CT distorted secondary current waveform in online conditions[J].IEEETransactions on Power Delivery,2016,31(2):711-720.
[6]崔迎宾,谭振宇,李庆民,等.电流互感器剩磁影响因素和发生规律的仿真分析[J].电力系统自动化,2010,34(23):87-91.Cui Yingbing,Tan Zhenyu,Li Qingmin,et al.Current transformer remanence influencing factors and occurrence regularity of simulation analysis[J].Automation of Electric Power Systems,2010,34(23):87-91(in Chinese).
[7]李长云,李庆民,李贞,等.直流偏磁和剩磁同时作用下保护用电流互感器的暂态特性研究[J].电力系统保护与控制,2010,38(23):107-111.Li Changyun,Li Qingmin,Li Zhen,et al.Research on the transient characteristics of the protective CTS with co-impacts of DC bias and remnant flux[J].Power System Protection and Control,2010,38(23):107-111(in Chinese).
[8]Ge W,Wang Y,Zhao Z,et al.Residual flux in the closed magnetic core of a power transformer[J].IEEETransactions on Applied Superconductivity,2014,24(3):1-4.
[9]IEEE.IEEE Std 57.13-1993 IEEE standard requirements for instrument transformers[S].New York:IEEE,2003.
[10]Society I P.IEEE Guide for Diagnostic Field Testing of Fluid-Filled Power Transformers,Regulators,and Reactors[S].New York:IEEE,2013.
[11]Kristensen H,Mrdic V.Comparative analysis of three-phase and single-phase dynamic resistance measurement results[C]//International Conference and Exhibition on Electricity Distribution,IET,2013:1-4.
[12]Kovan B,Leon F D,Czarkowski D,et al.Mitigation of inrush currents in network transformers by reducing the residual flux with an ultra-low-Frequency power source[J].IEEE Transactions on Power Delivery,2011,26(3):1563-1570.
[13]León F D,Farazmand A,Jazebi S,et al.Elimination of residual flux in transformers by the application of an alternating polarity DC voltage source[J].IEEETransactions on Power Delivery,2015,30(4):1727-1734.
[14]郑涛,马玉龙,黄婷,等.保护用电流互感器铁芯剩磁衰减规律分析[J].电力自动化设备,2017,37(10):126-131.Zhen Tao,Ma Yulong,Huang Ting,et al.Attenuation law analysis of core residual magnetism for protective current transformer[J].Electric Power Automation Equipment,2017,37(10):126-131(in Chinese).
[15]Hajipour E,Salehizadeh M,Vakilian M,et al.Residual flux mitigation of protective current transformers used in an autoreclosing scheme[J].IEEE Transactions on Power Delivery,2016,31(4):1636-1644.
[16]袁季修,盛和乐,吴聚业.保护用电流互感器应用指南[M].北京:中国电力出版社,2004.Yuan Jixiu,Sheng Hele,Wu Juye.The guide to application of current transformer for relay protection equipment[M].Beijing:China Electric Power Press,2004(in Chinese).
[17]张小庆,张宜阳,薛建,等.电流互感器大电流饱和测试技术研究[J].电网与清洁能源,2016,32(7):58-64.Zhang Xiaoqing,Zhang Yiyang,Xue Jian,et al.Research on saturation test under high current for current transformers[J].Power System and Clean Energy,2016,32(7):58-64(in Chinese).
[18]雷阳,段建东,张小庆,等.电流互感器J-A模型参数辨识及大通流动模试验[J].中国电机工程学报,2016,36(S1):240-245.Lei Yang,Duan Jiandong,Zhang Xiaoqing,et al.Identification of current transformer J-A model parameters with large current dynamic simulation experiments[J].Proceedings of the CSEE,2016,36(S1):240-245(in Chinese).
[2]Stanbury M,Djekic Z.The impact of current-transformer saturation on transformer differential protection[J].IEEETransactions on Power Delivery,2015,30(3):1278-1287.
[3]毕大强,冯存亮,葛宝明.电流互感器局部暂态饱和识别的研究[J].中国电机工程学报,2012,32(31):184-190.Bi Daqiang,Feng Cunliang,Ge Baoming.Research on identification of partial transient saturation in current transformer[J].Proceedings of the CSEE,2012,32(31):184-190(in Chinese).
[4]刘益青,高伟聪,王成友,等.基于差电流半周积分特征的电流互感器饱和识别方法[J].电网技术,2016,40(9):2889-2896.Liu Yiqing,Gao Weicong,Wang Chengyou,et al.Current transformer saturation recognition method based on the differential current and a half weeks integral characteristics[J].Power System Technology,2016,40(9):2889-2896(in Chinese).
[5]Haghjoo F,Pak M H.Compensation of CT distorted secondary current waveform in online conditions[J].IEEETransactions on Power Delivery,2016,31(2):711-720.
[6]崔迎宾,谭振宇,李庆民,等.电流互感器剩磁影响因素和发生规律的仿真分析[J].电力系统自动化,2010,34(23):87-91.Cui Yingbing,Tan Zhenyu,Li Qingmin,et al.Current transformer remanence influencing factors and occurrence regularity of simulation analysis[J].Automation of Electric Power Systems,2010,34(23):87-91(in Chinese).
[7]李长云,李庆民,李贞,等.直流偏磁和剩磁同时作用下保护用电流互感器的暂态特性研究[J].电力系统保护与控制,2010,38(23):107-111.Li Changyun,Li Qingmin,Li Zhen,et al.Research on the transient characteristics of the protective CTS with co-impacts of DC bias and remnant flux[J].Power System Protection and Control,2010,38(23):107-111(in Chinese).
[8]Ge W,Wang Y,Zhao Z,et al.Residual flux in the closed magnetic core of a power transformer[J].IEEETransactions on Applied Superconductivity,2014,24(3):1-4.
[9]IEEE.IEEE Std 57.13-1993 IEEE standard requirements for instrument transformers[S].New York:IEEE,2003.
[10]Society I P.IEEE Guide for Diagnostic Field Testing of Fluid-Filled Power Transformers,Regulators,and Reactors[S].New York:IEEE,2013.
[11]Kristensen H,Mrdic V.Comparative analysis of three-phase and single-phase dynamic resistance measurement results[C]//International Conference and Exhibition on Electricity Distribution,IET,2013:1-4.
[12]Kovan B,Leon F D,Czarkowski D,et al.Mitigation of inrush currents in network transformers by reducing the residual flux with an ultra-low-Frequency power source[J].IEEE Transactions on Power Delivery,2011,26(3):1563-1570.
[13]León F D,Farazmand A,Jazebi S,et al.Elimination of residual flux in transformers by the application of an alternating polarity DC voltage source[J].IEEETransactions on Power Delivery,2015,30(4):1727-1734.
[14]郑涛,马玉龙,黄婷,等.保护用电流互感器铁芯剩磁衰减规律分析[J].电力自动化设备,2017,37(10):126-131.Zhen Tao,Ma Yulong,Huang Ting,et al.Attenuation law analysis of core residual magnetism for protective current transformer[J].Electric Power Automation Equipment,2017,37(10):126-131(in Chinese).
[15]Hajipour E,Salehizadeh M,Vakilian M,et al.Residual flux mitigation of protective current transformers used in an autoreclosing scheme[J].IEEE Transactions on Power Delivery,2016,31(4):1636-1644.
[16]袁季修,盛和乐,吴聚业.保护用电流互感器应用指南[M].北京:中国电力出版社,2004.Yuan Jixiu,Sheng Hele,Wu Juye.The guide to application of current transformer for relay protection equipment[M].Beijing:China Electric Power Press,2004(in Chinese).
[17]张小庆,张宜阳,薛建,等.电流互感器大电流饱和测试技术研究[J].电网与清洁能源,2016,32(7):58-64.Zhang Xiaoqing,Zhang Yiyang,Xue Jian,et al.Research on saturation test under high current for current transformers[J].Power System and Clean Energy,2016,32(7):58-64(in Chinese).
[18]雷阳,段建东,张小庆,等.电流互感器J-A模型参数辨识及大通流动模试验[J].中国电机工程学报,2016,36(S1):240-245.Lei Yang,Duan Jiandong,Zhang Xiaoqing,et al.Identification of current transformer J-A model parameters with large current dynamic simulation experiments[J].Proceedings of the CSEE,2016,36(S1):240-245(in Chinese).