基于动态虚拟磁通分析的CT饱和识别方案研究
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摘要
阐述了CT的工作原理,分析了CT饱和时铁芯磁通的特征,提出了基于动态虚拟磁通分析的CT饱和识别方案。该方案通过二次电流与CT铁芯磁通存在的联系计算动态虚拟磁通,根据CT饱和时饱和区磁通达到最大值与电流过零时刻的相对时间变短进行CT饱和识别,根据CT饱和时线性区磁通小于饱和区的磁通进行线性区识别。该方案利用磁通特征识别饱和及线性区,不受非周期分量、高次谐波等电流特征的影响。经仿真验证,该方案能够快速判断CT是否发生饱和,准确定位线性区起止点,原理简单,实现方便,具有实际应用价值。
After analyzing the characteristic of core magnetic flux of CT during CT saturation, a new method based on dynamic virtual magnetic flux to identify CT saturation is proposed. The method calculates the dynamic virtual magnetic flux with secondary current with the relations between secondary current and magnetic flux. The method can identify CT saturation with the characteristic of core magnetic flux that the time between the starting of CT saturation when the magnetic flux reaches the maximum and zero time of secondary current is shorter, and identify linear data with that value of core magnetic flux during linear data is less than it during CT saturation. The method uses the characteristic of core magnetic flux to identify CT saturation, which will not affected by the characteristic of secondary current such as aperiodic component and high harmonics. The simulation results show that the proposed method can quickly identify CT saturation, position the start and end point of linear data accurately, which has simple principle, is easy to realize and has practical application value.
After analyzing the characteristic of core magnetic flux of CT during CT saturation, a new method based on dynamic virtual magnetic flux to identify CT saturation is proposed. The method calculates the dynamic virtual magnetic flux with secondary current with the relations between secondary current and magnetic flux. The method can identify CT saturation with the characteristic of core magnetic flux that the time between the starting of CT saturation when the magnetic flux reaches the maximum and zero time of secondary current is shorter, and identify linear data with that value of core magnetic flux during linear data is less than it during CT saturation. The method uses the characteristic of core magnetic flux to identify CT saturation, which will not affected by the characteristic of secondary current such as aperiodic component and high harmonics. The simulation results show that the proposed method can quickly identify CT saturation, position the start and end point of linear data accurately, which has simple principle, is easy to realize and has practical application value.
引文
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[12]杨恢宏,谢百煌,毕大强,等.基于虚拟制动电流采样点差动的CT饱和识别方法[J].继电器,2006,34(13):50-53.YANG Huihong,XIE Baihuang,BI Daqiang,et al.Using the sampling differential protection based on the constructed restraint current to identify CT saturation[J].Relay,2006,34(13):50-53.
[13]李旭,黄继东,倪传坤,等.不同电流互感器混用对线路差动保护的影响及对策的研究[J].电力系统保护与控制,2014,42(3):141-145.LI Xu,HUANG Jidong,NI Chuankun,et al.Influence of mixing different types of current transformers on line differential protection and the countermeasures[J].Power System Protection and Control,2014,42(3):141-145.
[14]袁季修,盛和乐.电流互感器的暂态饱和及应用计算[J].继电器,2002,30(2):1-5.YUAN Jixiu,SHENG Hele.The transient saturation of current transformer and its application calculation[J].Relay,2002,30(2):1-5.
[2]戚宣威,尹项根,李甘,等.一种电流互感器仿真分析平台构建方法[J].电力系统保护与控制,2015,43(22):69-76.QI Xuanwei,YIN Xianggen,LI Gan,et al.A construction method for the simulation platform for the analysis of the current transformer[J].Power System Protection and Control,2015,43(22):69-76.
[3]束洪春,曹璞璘,杨竞及,等.考虑互感器传变特性的输电线路暂态保护雷击干扰与线路故障识别方法[J].电工技术学报,2015,30(3):1-12.SHU Hongchun,CAO Pulin,YANG Jingji,et al.A method to distinguish between fault and lightning disturbance on transmission lines based on CTV secondary voltage and CT secondary current[J].Transactions of China Electrotechnical Society,2015,30(3):1-12.
[4]戈文祺,汪友华,陈学广,等.电力变压器铁心剩磁的测量与削弱方法[J].电工技术学报,2015,30(16):10-16.GE Wenqi,WANG Youhua,CHEN Xueguang,et al.Method to measure and weaken the residual flux of the power transformer core[J].Transactions of China Electrotechnical Society,2015,30(16):10-16.
[5]张建功,赵军,谢鹏康,等.VFTO作用下电子式电流互感器二次端口电磁特性仿真分析[J].电工技术学报,2015,30(2):88-94.ZHANG Jiangong,ZHAO Jun,XIE Pengkang,et al.Simulation and analysis of electromagnetic properties at the secondary port of electronic current transformers under very fast transient overvoltage[J].Transactions of China Electrotechnical Society,2015,30(2):88-94.
[6]李笑,段建东,王倩,等.基于等效瞬时电感频域特性的配电网励磁涌流识别方法研究[J].陕西电力,2015,43(6):34-38.LI Xiao,DUAN Jiandong,WANG Qian,et al.Identification of distribution network inrush current based on equivalent magnetizing inductance frequency characteristics[J].Shaanxi Electric Power,2015,43(6):34-38.
[7]邓旭阳,索南加乐,李广,等.基于参数识别的电流互感器饱和识别原理研究[J].电力系统保护与控制,2011,39(18):38-43.DENG Xuyang,SUONAN Jiale,LI Guang,et al.A novel current transformer saturation detecting method based on parameter identification[J].Power System Protection and Control,2011,39(18):38-43.
[8]陈丽艳,何奔腾.一种基于负荷电流检测的电流互感器饱和识别辅助判据[J].电力系统保护与控制,2010,38(18):69-73.CHEN Liyan,HE Benteng.An assistant criterion for distinguishing current transformer saturation based on the load current detection[J].Power System Protection and Control,2010,38(18):69-73.
[9]罗慧,周卿松,苗洪雷,等.基于LMD母线差动保护CT饱和检测方法研究[J].电力系统保护与控制,2015,43(12):49-54.LUO Hui,ZHOU Qingsong,MIAO Honglei,et al.A method for CT saturation detection based on LMD in busbar differential protection[J].Power System Protection and Control,2015,43(12):49-54.
[10]沈全荣,严伟,梁乾兵,等.异步法电流互感器饱和判别新原理及其应用[J].电力系统自动化,2005,29(16):84-86.SHEN Quanrong,YAN Wei,LIANG Qianbing,et al.Asynchronous method for the recognition of current transformer saturation and its application[J].Automation of Electric Power Systems,2005,29(16):84-86.
[11]李岩,陈德树,张哲,等.鉴别TA饱和的改进时差法研究[J].继电器,2001,29(11):1-4,8.LI Yan,CHEN Deshu,ZHANG Zhe,et al.Research of the improved time difference method to distinguish TA's saturation[J].Relay,2001,29(11):1-4,8.
[12]杨恢宏,谢百煌,毕大强,等.基于虚拟制动电流采样点差动的CT饱和识别方法[J].继电器,2006,34(13):50-53.YANG Huihong,XIE Baihuang,BI Daqiang,et al.Using the sampling differential protection based on the constructed restraint current to identify CT saturation[J].Relay,2006,34(13):50-53.
[13]李旭,黄继东,倪传坤,等.不同电流互感器混用对线路差动保护的影响及对策的研究[J].电力系统保护与控制,2014,42(3):141-145.LI Xu,HUANG Jidong,NI Chuankun,et al.Influence of mixing different types of current transformers on line differential protection and the countermeasures[J].Power System Protection and Control,2014,42(3):141-145.
[14]袁季修,盛和乐.电流互感器的暂态饱和及应用计算[J].继电器,2002,30(2):1-5.YUAN Jixiu,SHENG Hele.The transient saturation of current transformer and its application calculation[J].Relay,2002,30(2):1-5.