高压内置型变压器空投导致零序电流保护误动分析及对策
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摘要
对高压内置型变压器励磁涌流及其零序分量特性进行深入分析。结合该类型变压器结构特点,指出与常规变压器相比,高压内置型变压器涌流零序分量更大且衰减更为缓慢,造成相关零序电流保护更容易发生误动。在PSCAD/EMTDC中搭建仿真模型,分析了合闸角、剩磁和运行方式对高压内置型变压器空投时的励磁涌流零序分量的影响,并给出了零序电流保护误动概率。建议通过优化零序电流保护定值、增加空载合闸运行及间隔时间、采用涌流抑制措施来保证变压器正常投运。
The characteristics of excitation inrush current and its zero sequence component of high voltage built in transformer are studied and analyzed in this paper. Compared with the conventional transformer, the high-voltage built-in transformer inrush current zero sequence component is larger and decays more slowly under its structural characteristics, because the zero sequence current protection are more prone to misoperation. Based on EMTDC/PSCAD, the effect of residual magnetism, closing angle and operation mode on the zero sequence component of no-load transformer is analyzed. Besides, the misoperation probability of zero sequence current protection is given. It is recommended to ensure the normal operation of the transformer by optimizing the zero sequence current protection setting value, increasing no-load closing operation and interval time, and adopting inrush current suppression measures.
The characteristics of excitation inrush current and its zero sequence component of high voltage built in transformer are studied and analyzed in this paper. Compared with the conventional transformer, the high-voltage built-in transformer inrush current zero sequence component is larger and decays more slowly under its structural characteristics, because the zero sequence current protection are more prone to misoperation. Based on EMTDC/PSCAD, the effect of residual magnetism, closing angle and operation mode on the zero sequence component of no-load transformer is analyzed. Besides, the misoperation probability of zero sequence current protection is given. It is recommended to ensure the normal operation of the transformer by optimizing the zero sequence current protection setting value, increasing no-load closing operation and interval time, and adopting inrush current suppression measures.
引文
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[17]张雪松,何奔腾.变压器和应涌流对继电保护影响的分析[J].中国电机工程学报,2006,26(14):12-17.ZHANG Xuesong,HE Benteng.Influence of sympathetic interaction between transformers on relay protection[J].Proceedings of the CSEE,2006,26(14):12-17.
[18]李晓华,罗龙波,谢金泉,等.高压内置型高阻抗变压器涌流特性对保护的影响[J].电力系统自动化,2016,40(11):108-114.LI Xiaohua,LUO Longbo,XIE Jinquan,et al.Impact of inrush current characteristics of high-voltage built-in high-impedance transformer on relay[J].Automation of Electric Power Systems,2016,40(11):108-114.
[19]方愉冬,徐习东,朱炳铨.变压器涌流对零序电流保护的影响分析[J].电力自动化设备,2008,28(9):115-118.FANG Yudong,XU Xidong,ZHU Bingquan.Influence of transformer inrush on zero-sequence current protection[J].Electric Power Automation Equipment,2008,28(9):115-118.
[20]沃建栋,郑涛,万磊,等.基于合闸控制策略的变压器励磁涌流抑制措施研究[J].电力系统保护与控制,2010,38(22):32-36.WO Jiandong,ZHENG Tao,WAN Lei,et al.Study on inrush current suppression method based on the breaker control strategy[J].Power System Protection and Control,2010,38(22):32-36.
[2]李勇,苏钟焕,王然丰,等.高压内置型高阻抗变压器励磁涌流计算分析[J].变压器,2017,54(8):1-5.LI Yong,SU Zhonghuan,WANG Ranfeng,et al.Calculation and analysis of magnetizing inrush current of high impedance transformer with built-in high voltage winding[J].Transformer,2017,54(8):1-5.
[3]傅伟,赵莉华,梁勇,等.多台变压器空载合闸励磁涌流及其抑制方案的研究[J].电力系统保护与控制,2015,43(1):28-33.FU Wei,ZHAO Lihua,LIANG Yong,et al.Study on no-load closing inrush current of transformer group and suppression measures[J].Power System Protection and Control,2015,43(1):28-33.
[4]WU Y H,DONG X Z,MIRSAEIDI S.Modeling and simulation of air-gapped current transformer based on Preisach theory[J].Protection and Control of Modern Power Systems,2017,2(2):111-121.DOI:10.1186/s41601-017-0046-0.
[5]宗洪良,金华烽,朱振飞,等.基于励磁阻抗变化的变压器励磁涌流判别方法[J].中国电机工程学报,2001,21(7):91-94.ZONG Hongliang,JIN Huafeng,ZHU Zhenfei,et al.Transformer inrush detected by the variation of magnetizing impedance[J].Proceedings of the CSEE,2001,21(7):91-94.
[6]史泽兵,郝后堂,江卫良.一种新型的励磁涌流制动方案[J].电力系统保护与控制,2012,40(8):147-150.SHI Zebing,HAO Houtang,JIANG Weiliang.A new restraint scheme for inrush current[J].Power System Protection and Control,2012,40(8):147-150.
[7]刘小宝,吴崇昊,宋艳,等.基于二次谐波的自适应制动涌流方案[J].电力系统保护与控制,2010,38(18):131-134.LIU Xiaobao,WU Chonghao,SONG Yan,et al.Adaptive secondary harmonic restraint method for inrush current[J].Power System Protection and Control 2010,38(18):131-134.
[8]邵文权,乔妮,王建波.基于波形互相关系数的变压器励磁涌流识别方法[J].电力系统保护与控制,2015,43(23):14-20.SHAO Wenquan,QIAN Ni,WANG Jianbo.A novel algorithm of identify inrush current based on waveform cross-correlation coefficient[J].Power System Protection and Control,2015,43(23):14-20.
[9]周建平,罗建.变压器铁心剩磁的一种估算方法[J].热力发电,2010,39(3):61-64.ZHOU Jianping,LUO Jian.A method of estimating residual magnetism in iron core of transformers[J].Thermal Power Generation,2010,39(3):61-64.
[10]姚东晓,邓茂军,倪传坤,等.变压器多侧励磁涌流产生机理及对差动快速动作区影响研究[J].电力系统保护与控制,2016,44(5):36-41.YAO Dongxiao,DENG Maojun,NI Chuankun,et al.Transformer's multi-side inrush current generation mechanism and its influence on the differential protection's fast action zone[J].Power System Protection and Control,2016,44(5):36-41.
[11]张召峰,孙庆森,张海峰,等.变压器励磁涌流中的信息熵识别[J].电力系统保护与控制,2017,45(12):107-111.ZHANG Shaofeng,SUN Qingsen,ZHANG Haifeng,et al.Identification of information entropy in transformer inrush current[J].Power System Protection and Control,2017,45(15):107-111.
[12]孙庆森,张海峰,王猛,等.小波算法在变压器励磁涌流中的应用研究[J].电力系统保护与控制,2017,45(8):121-125.SUN Qingsen,ZHANG Haifeng,WANG Meng,et al.Application of wavelet algorithm in the transformer inrush current[J].Power System Protection and Control,2017,45(8):121-125.
[13]陈继瑞,张营伟,刘洁,等.一种变压器保护采样可靠性及涌流识别方案的研究[J].电力系统保护与控制,2016,44(14):166-170.CHEN Jirui,ZHANG Yingwei,LIU Jie,et al.A research of transformer protection about sampling reliability and inrush current identification[J].Power System Protection and Control,2016,44(14):166-170.
[14]王业,陆于平,蔡超,等.采用自适应数据窗电流的励磁涌流鉴别方法[J].中国电机工程学报,2014,34(4):702-711.WANG Ye,LU Yuping,CAI Chao,et al.A magnetizing inrush identification method applying adaptive data-window currents[J].Proceedings of the CSEE,2014,34(4):702-711.
[15]王雪,王增平.基于波形时域分布特征的变压器励磁涌流识别[J].电工技术学报,2012,27(1):148-154.WANG Xue,WANG Zengping.Identification of transformer inrush currents based on waveform distribution characteristics[J].Transactions of China Electrotechnical Society,2012,27(1):148-154.
[16]张炳达,黄杰.基于差分双正交小波熵的变压器励磁涌流识别算法[J].电力系统保护与控制,2014,42(18):9-13.ZHANG Bingda,HUANG Jie.Identification of transformer inrush current based on difference biorthogonal wavelet entropy[J].Power System Protection and Control,2014,42(18):9-13.
[17]张雪松,何奔腾.变压器和应涌流对继电保护影响的分析[J].中国电机工程学报,2006,26(14):12-17.ZHANG Xuesong,HE Benteng.Influence of sympathetic interaction between transformers on relay protection[J].Proceedings of the CSEE,2006,26(14):12-17.
[18]李晓华,罗龙波,谢金泉,等.高压内置型高阻抗变压器涌流特性对保护的影响[J].电力系统自动化,2016,40(11):108-114.LI Xiaohua,LUO Longbo,XIE Jinquan,et al.Impact of inrush current characteristics of high-voltage built-in high-impedance transformer on relay[J].Automation of Electric Power Systems,2016,40(11):108-114.
[19]方愉冬,徐习东,朱炳铨.变压器涌流对零序电流保护的影响分析[J].电力自动化设备,2008,28(9):115-118.FANG Yudong,XU Xidong,ZHU Bingquan.Influence of transformer inrush on zero-sequence current protection[J].Electric Power Automation Equipment,2008,28(9):115-118.
[20]沃建栋,郑涛,万磊,等.基于合闸控制策略的变压器励磁涌流抑制措施研究[J].电力系统保护与控制,2010,38(22):32-36.WO Jiandong,ZHENG Tao,WAN Lei,et al.Study on inrush current suppression method based on the breaker control strategy[J].Power System Protection and Control,2010,38(22):32-36.