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Transformer Differential

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KBCH 120, 130, 140 Transformer Dirrerential Relay Service Manual duonza
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  MiCOM 30 SeriesTransformer Differential Protection Application Guide Issue F , June 2003  Px3x TransformerDifferential ApplicationGuide EN f.doc – 2 – Contents 1Introduction.........................................................................................................42Mode of Operation and Basic Setting Instructions...............................................5 2.1Amplitude Matching............................................................................................52.2Vector Group Matching and Zero-Sequence Current Filtering.................................82.3Tripping Characteristic......................................................................................122.3.1Definition of I d  and I R  ........................................................................................122.3.2First Section of the Tripping Characteristic..........................................................132.3.3Second Section of the Tripping Characteristic.....................................................142.3.4Third Section of the Tripping Characteristic.........................................................152.3.5Algorithmic Treatment of I d  and I R  ......................................................................17 3Setting Instructions for Special Applications......................................................18 3.1Unfavorable Primary Nominal Transformer Current.............................................183.2In-Zone Grounding Transformer........................................................................193.3Tap-Changing Transformers..............................................................................203.4Autotransformers..............................................................................................233.4.1Delta Tertiary Winding without Feeders..............................................................253.4.2Neutral Grounding with Phase-Segregated CTs..................................................253.4.3CTs in Series with Delta Tertiary Winding...........................................................263.4.4CTs outside Delta Tertiary Winding....................................................................283.5Generators and Motors.....................................................................................283.6CT Delta Connection........................................................................................29 4Instructions for Commissioning and Testing......................................................33 4.1Checking the Phase Angle of the Phase Currents.................................................334.2Checking the Basic Threshold Value of the Tripping Characteristic........................344.2.1Single-End, Three-Phase Symmetrical Infeed......................................................344.2.2Single-End, Single-Phase Infeed........................................................................34  Appendix   AVector Groups and Transformer Configurations  – 3 – Px3x TransformerDifferential ApplicationGuide EN f.doc Symbols and Subscripts Symbols ICurrent phasoraOperator for phase rotation of +120° VVoltage ϕ  AngleSPowerkMatching factor Subscripts primPrimary quantity secSecondary quantity relVariable within relay nomNominal quantity refReference quantity maxMaximum valuemax-1Second largest valuemidMean valueminMinimum valueCTMain current transformer (set) A, B, CPhase A, B, or CxDummy variable for phase A, B, or Cx+1Dummy variable for the lagging phase in the cycle with respect to phase A, B, orCx-1Dummy variable for the leading phase in the cycle with respect to phase A, B, orCampAmplitude-matchedvecAmplitude-matched and vector-group-matched (including zero-sequence currentfiltering)zeroZero-sequence componentposPositive-sequence componentnegNegative-sequence component1, 2, 3Measuring system 1, 2, or 3yDummy variable for measuring system 1, 2, or 3a, b, c, dEnd or winding a, b, c, or d of the protected objectzDummy variable for end or winding a, b, c, or d of the protected objectdDifferential variableRRestraining variable  Px3x TransformerDifferential ApplicationGuide EN f.doc – 4 – 1   Introduction Protection devices in the MiCOM 30 series are described in detail in the respective operatingmanuals as regards technical properties, functional characteristics, and proper handlingduring installation, connection, commissioning, and operation. However, the operatingmanuals do not provide any information regarding the philosophy behind each specificproduct or the way in which the functional possibilities of a particular protection device can beused to handle special applications.The present application guide is intended to close this gap. For the transformer differentialprotection function group of MiCOM P63x devices, the purpose is to give the reader a betterunderstanding of the design of the individual function blocks and then to provide relatedinstructions for settings, commissioning, and testing.
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