第38卷第16期电力系统保护与控制Vol.38No.162010年8月16日PowerSystemProtectionandControlAug.16,2010基于Yn/Δ接线变压器零序纵差保护原理研究索南加乐，张军民，许立强，谈树峰，焦在滨，杜斌，赵选宗（西安交通大学电气工程学院，陕西西安710049）摘要：变压器传统电流差动保护在反映接地故障及匝间故障时灵敏度存在着不足，由此提出了在变压器区内弱故障时仍能可靠动作的基于零序电流的纵差保护方案，不同于目前所说的零序电流差动只是针对变压器Y侧绕组应用，利用Y以及∆侧绕组中的零序电流构成差动保护。按照典型的电流互感器配置方案，∆侧绕组电流未知，采用零序等值电路计算∆侧绕组中的零序环流，PSCAD仿真以及动模数据均验证了该方法的正确性。通过变压器各种故障情况下零序纵差保护和传统保护性能的比较表明：零序电流纵差保护在反映单相接地和小匝间短路时灵敏度更高，且受励磁涌流影响更小。关键词：变压器；零序等值电路；Y-Delta绕组；零序电流纵差保护Studyofzero-sequencedifferentialprotectionfortransformerwithYn/ΔconnectionSUONANJia-le，ZHANGJun-min，XULi-qiang，TANShu-feng，JIAOZai-bin，DUBin，ZHAOXuan-zong（SchoolofElectricalEngineering,Xi’anJiaotongUniversity，Xi’an710049，China）Abstract：Becauseconventionaldifferentialprotectionisnotsensitiveenoughtoearthingfaultandinter-turnfault，adifferentialprotectionmethodbasedonzero-sequencecurrentisproposedwhichcanstillreliablyoperatewhentransformerinternalweakfaultoccurs．Differentfrompresentscheme,thenewprotectionschemeisconstructedbyusingthezero-sequencecurrentofeachside.Thezero-sequenceloopcurrentinthedeltasidecanbecalculatedbythezero-sequenceequivalentcircuitaccordingtotypicalCTconfigurationschemeandunknowncurrentindeltaside.SimulationwithPSCADanddynamicmodeldatashowthattheproposedprincipleiscorrect．Thecomparisonsbetweentheperformanceofzero-sequencedifferentialprotectionandconventionaldifferentialprotectionsuggestthatthezero-sequencedifferentialprotectionhashighersensitivitytoearthingfaultandsmallinter-turnfault,andsufferslessinfluencefrominrush．ThisprojectissupportedbyNationalNaturalScienceFoundationofChina（No.50677051andNo.50877061）andtheMajorStateBasicResearchDevelopmentProgramofChina（973program）(No.2009CB219704)．Keywords：transformer；zero-sequenceequivalentcircuit；Y-Deltaconnection；zero-sequencecurrentdifferentialprotection中图分类号：TM771；TM773文献标识码：A文章编号：1674-3415(2010)16-0054-08电流的特征，纵差保护应该动作，但是当短路匝数0引言较少时虽然短路绕组的环流很大，而反映到变压器变压器在系统中占据着重要的地位，由于电流各侧的故障电流并不大，甚至比负荷电流还小。变纵差保护不但能够正确区分区内外故障，而且不需压器在额定负荷