孙仲民,张晓宇,林金娇,顾乔根,李鹏,莫品豪,郑超
SUN Zhongmin,ZHANG Xiaoyu,LIN Jinjiao,GU Qiaogen,LI Peng,MO Pinhao,ZHENG Chao

• 1:南京南瑞继保电气有限公司
• 2:国网江苏省电力有限公司电力科学研究院

摘要(Abstract)：

当Yd接线变压器的角侧绕组未配置电流互感器时，差动保护需利用角侧环外电流进行差动电流计算。针对此工况下变压器发生单相故障时差动保护灵敏度降低的问题，提出一种基于零序差流特征的变压器差动保护优化方法。首先，采用星侧不减零序分量的方法计算各侧校正电流，进而得到三相差动电流。其次，根据单相故障时差动电流的特征，得出真实零序差流的估计值，以消除零序分量的影响，获得校正后的差动电流。随后，结合校正后的差动电流与比率差动特性判断保护是否动作，并依据动作相别实现故障选相。最后，通过仿真与实际波形验证了所提方法的有效性，该方法在单相故障时能够增大故障相差动电流，消除零序分量对非故障相的影响，提高了差动保护的灵敏度与故障选相准确率。
When current transformers are not installed on the delta winding of a wye-delta transformer, the differential protection must utilize currents measured outside the delta winding to calculate the differential current. To address the issue of reduced differential protection sensitivity during single-phase faults under this configuration, this paper proposes an optimal transformer differential protection method based on zero-sequence differential current characteristics. Firstly, the corrected currents on each side are calculated using a method that does not subtract the zero-sequence component from the delta side currents, from which the three-phase differential currents are derived. Secondly, based on the characteristics of the differential current during single-phase faults, an estimated value of the zero-sequence differential current is obtained. This is used to eliminate the influence of the zero-sequence component, yielding a corrected differential current. Subsequently, the protection operation decision is made by combining this corrected differential current with the percentage differential characteristic, and fault phase selection is achieved based on the operated phase. Finally, simulations and actual waveform tests verify the effectiveness of the proposed method. The results demonstrate that the method increases the differential current in the faulted phase during single-phase faults while eliminating the impact of the zero-sequence component on the healthy phases, thereby improving both the sensitivity of the differential protection and the accuracy of fault phase selection.

关键词(KeyWords)： 变压器;继电保护;差动保护;零序差流;故障选相
transformer;relay protection;differential protection;zero-sequence differential current;fault phase selection

Abstract:

Keywords:

基金项目(Foundation): 国家电网公司总部科技项目（5500-202318115A-1-1-ZN）

作者(Author): 孙仲民,张晓宇,林金娇,顾乔根,李鹏,莫品豪,郑超
SUN Zhongmin,ZHANG Xiaoyu,LIN Jinjiao,GU Qiaogen,LI Peng,MO Pinhao,ZHENG Chao

DOI: 10.19585/j.zjdl.202604008

参考文献(References)：

• [1]郑涛，胡鑫.特高压换流变故障性涌流产生机理及其对差动保护的影响[J].电力自动化设备，2019,39(5):109-115.ZHENG Tao,HU Xin.Fault inrush current mechanism of UHV converter transformer and its impacts on differential protection[J]. Electric Power Automation Equipment,2019,39(5):109-115.
• [2]卢应强，胡忠忠，尚虎军，等.变压器绕组典型缺陷下漏磁特性及辨识方法研究[J].浙江电力，2025,44(2):110-123.LU Yingqiang,HU Zhongzhong,SHANG Hujun,et al.Research on magnetic flux leakage characteristics and identification methods under typical transformer winding defects[J].Zhejiang Electric Power,2025,44(2):110-123.
• [3]宗琳，周晓华，罗文广，等.蜣螂算法优化概率神经网络的变压器故障诊断[J].智慧电力，2024,52(5):98-104.ZONG Lin,ZHOU Xiaohua,LUO Wenguang,et al.Transformer fault diagnosis based on probabilistic neural network optimized by dung beetle optimizer[J]. Smart Power,2024,52(5):98-104.
• [4]孙仲民，顾乔根，张晓宇，等.分接开关可控移相变压器保护配置及故障特征分析[J].电力系统保护与控制，2024,52(14):121-131.SUN Zhongmin,GU Qiaogen,ZHANG Xiaoyu,et al.Protection configuration and fault characteristics analysis of a tap-changer controllable phase-shifting transformer[J].Power System Protection and Control,2024,52(14):121-131.
• [5]陈松林，李海英，乔勇，等.RCS—978变压器成套保护装置[J].电力系统自动化，2000,24(22):52-56.CHEN Songlin,LI Haiying,QIAO Yong,et al. Rcs-978digital transformer protection set[J].Automation of Electric Power Systems,2000,24(22):52-56.
• [6]韩霄，陈浩天，周佳，等.变压器分闸对铁心剩磁的影响研究[J].浙江电力，2025,44(2):103-109.HAN Xiao,CHEN Haotian,ZHOU Jia,et al.Research on the impact of transformer switching-off on core residual magnetism[J].Zhejiang Electric Power,2025,44(2):103-109.
• [7]翁汉琍，梅瀚予，郭祎达，等.基于差流符号序列特征的变压器励磁涌流识别判据[J].电力自动化设备，2022,42(6):206-211.WENG Hanli,MEI Hanyu,GUO Yida,et al. Identification criterion of transformer magnetizing inrush current based on symbol sequence characteristic of differential current[J].Electric Power Automation Equipment,2022,42(6):206-211.
• [8]郑涛，国兴超，胡鑫，等.逆变侧换流变压器故障性涌流产生机理及其对差动保护的影响[J].电力自动化设备，2019,39(9):39-45.ZHENG Tao,GUO Xingchao,HU Xin,et al.Fault inrush current generation mechanism of inverter-side converter transformer and its influence on differential protection[J].Electric Power Automation Equipment,2019,39(9):39-45.
• [9]郑涛，何瑞，杨鑫慧，等.故障性涌流影响下换流变差动保护的可靠性风险评估[J].电网技术，2021,45(11):4490-4497.ZHENG Tao,HE Rui,YANG Xinhui,et al. Reliability risk assessment of differential protection of converter transformer under influence of fault-induced inrush current[J].Power System Technology,2021,45(11):4490-4497.
• [10]翁汉琍，贾永波，李振兴，等.二维空间重构电流特征轨迹的变压器差动保护判据[J].电力系统自动化，2020,44(9):144-150.WENG Hanli,JIA Yongbo,LI Zhenxing,et al. Transformer differential protection criterion based on reconstructed trajectory of current characteristics in twodimensional space[J].Automation of Electric Power Systems,2020,44(9):144-150.
• [11]冯兴隆，孔锋峰，霍凯龙，等.基于5G无线通信的配电网电流差动保护系统设计[J].电测与仪表，2025,62(1):116-123.FENG Xinglong,KONG Fengfeng,HUO Kailong,et al.Design of current differential protection system for distribution network based on 5G wireless communication[J].Electrical Measurement&Instrumentation,2025,62(1):116-123.
• [12]史艳刚，朱海勇，陆立文，等.低频输电系统控制对差动保护影响及优化策略[J].电力工程技术，2025,44(3):160-169.SHI Yangang,ZHU Haiyong,LU Liwen,et al.Influence of low-frequency transmission system control on differential protection and optimization strategy[J].Electric Power Engineering Technology,2025,44(3):160-169.
• [13]郝韩兵，王同文，朱思杰，等.基于5G和粒子群算法的配电网差动保护[J].电测与仪表，2025,62(7):148-155.HAO Hanbing,WANG Tongwen,ZHU Sijie,et al.Differential protection of distribution network based on 5G and particle swarm algorithm[J].Electrical Measurement&Instrumentation,2025,62(7):148-155.
• [14]张心怡，盖午阳，孙巧玉，等.基于电流变异特性的直流配电系统单极接地差动保护方法[J].智慧电力，2025,53(6):93-100.ZHANG Xinyi,GAI Wuyang,SUN Qiaoyu,et al.Singlepole grounding differential protection method for DC distribution systems based on current variation characteristics[J].Smart Power,2025,53(6):93-100.
• [15]许瑞，於岳祥，李骁，等.基于5G的配电网线路纵联电流差动保护零序补偿方法[J].电测与仪表，2025,62(4):105-112.XU Rui,YU Yuexiang,LI Xiao,et al.Zero-sequence compensation method of line longitudinal current differentialprotection based on 5G distribution network[J].Electrical Measurement&Instrumentation,2025,62(4):105-112.
• [16]陈晓龙，朱雨葭，张浩，等.光伏电站主变压器比率差动保护对单相接地短路故障的适应性分析[J].电力自动化设备，2023,43(10):217-224.CHEN Xiaolong,ZHU Yujia,ZHANG Hao,et al.Adaptability analysis of photovoltaic power station main transformer ratio differential protection to single-phase grounding short circuit fault[J]. Electric Power Automation Equipment,2023,43(10):217-224.
• [17]吴建云，国兴超，罗美玲，等.逆变侧换流变压器网侧接地故障对差动保护影响分析[J].电力系统保护与控制，2020,48(17):170-178.WU Jianyun,GUO Xingchao,LUO Meiling,et al.Analysis of influence of grounding fault of the network side of an inverter-side converter transformer on differential protection[J]. Power System Protection and Control,2020,48(17):170-178.
• [18]郑玉平，龚心怡，潘书燕，等.变压器匝间短路故障工况下的漏磁特性分析[J].电力系统自动化，2022,46(15):121-127.ZHENG Yuping,GONG Xinyi,PAN Shuyan,et al.Analysis on leakage flux characteristics of turn-to-turn shortcircuit fault for power transformer[J].Automation of Electric Power Systems,2022,46(15):121-127.
• [19]中国电力企业联合会.2017年全国电力可靠性年度报告[EB/OL].(2018-06-07)[2025-06-11]. https：//cec. org.cn/detail/index.html 3-258004.
• [20]郑玉平，刘小宝，俞波，等.基于有功损耗的自适应变压器匝间保护[J].电力系统自动化，2013,37(10):104-107.ZHENG Yuping,LIU Xiaobao,YU Bo,et al.A method of adaptive transformer turn-turn fault protection based on power loss[J]. Automation of Electric Power Systems,2013,37(10):104-107.
• [21]郑玉平，郝治国，薛众鑫，等.大型电力变压器安全运行与主动保护技术探索[J].电力系统自动化，2023,47(20):1-12.ZHENG Yuping,HAO Zhiguo,XUE Zhongxin,et al.Exploration of safe operation and active protection technology for large-capacity power transformers[J].Automation of Electric Power Systems,2023,47(20):1-12.
• [22]顾乔根，张晓宇，吕航，等.基于故障负序分量的低频变压器快速差动保护[J].电力系统自动化，2023,47(7):184-192.GU Qiaogen,ZHANG Xiaoyu,LYU Hang,et al.Fast differential protection of low-frequency transformer based on fault negative sequence component[J]. Automation of Electric Power Systems,2023,47(7):184-192.
• [23]杜丁香，杨国生，曹虹，等.基于相序差动电流特征差异的换流变压器匝间保护优化研究[J].中国电机工程学报，2023,43(17):6576-6589.DU Dingxiang,YANG Guosheng,CAO Hong,et al.Research on the optimization of inter-turn protection of converter transformers based on the difference of phase sequence differential current characteristics[J]. Proceedings of the CSEE,2023,43(17):6576-6589.
• [24]曹虹，王兴国，周泽昕，等.UPFC串联变压器匝间保护新原理研究[J].电网技术，2020,44(4):1568-1575.CAO Hong,WANG Xingguo,ZHOU Zexin,et al. A novel protection principle for turn-to-turn fault of UPFC series transformer[J]. Power System Technology,2020,44(4):1568-1575.
• [25]ZHENG T,YANG X H,GUO X C,et al.Zero-sequence differential current protection scheme for converter transformer based on waveform correlation analysis[J]. Energies,2020,13(7):1814.
• [26]翁汉琍，王胜，饶丹青，等.后续换相失败引发的换流变零序差动保护误动场景分析及策略[J].电力自动化设备，2021,41(3):64-70.WENG Hanli,WANG Sheng,RAO Danqing,et al.Analysis of mal-operation scenarios of zero-sequence differential protection of converter transformer caused by subsequent commutation failure and corresponding strategy[J]. Electric Power Automation Equipment,2021,41(3):64-70.
• [27]游力，熊平，李震宇，等.500 kV变压器零序差动保护极性校验方法研究及现场试验[J].湖北电力，2020,44(2):67-73.YOU Li,XIONG Ping,LI Zhenyu,et al. Research and field test of zero sequence differential protection polarity checking method for 500 kV transformer[J].Hubei Electric Power,2020,44(2):67-73.
• [28]丁苏阳，林湘宁，翁汉琍，等.换流变零差保护在故障切除恢复性涌流期间的误动风险分析[J].中国电机工程学报，2017,37（增刊1）:12-20.DING Suyang,LIN Xiangning,WENG Hanli,et al.Maloperation risk analysis on zero-sequence differential protection of converter substation during existence of recovery inrush due to fault removal[J]. Proceedings of the CSEE,2017,37(S1):12-20.
• [29]翁汉琍，李昊威，万毅，等.特殊工况下换流变零序差动保护误动机理分析及对策研究[J].电力系统保护与控制，2020,48(5):56-64.WENG Hanli,LI Haowei,WAN Yi,et al.Mechanism and countermeasures of mal-operation of converter transformer zero-sequence differential protection under special conditions[J].Power System Protection and Control,2020,48(5):56-64.