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Transformer Differential Application Notes.pdf

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MiCOM 30 Series Transformer Differential Protection Application Guide Issue B, February 2001 TransformerDifferential ApplicationGuide EN b.doc – 2 – Contents 1 Introduction ............................................................................................. 4 2 Mode of Operation and Basic Setting Instructions ........................................ 5 2.1 Amplitude Matching ..................................................................................................... 5 2.2 Vecto
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  MiCOM 30 SeriesTransformer Differential Protection Application Guide Issue B, February 2001  TransformerDifferential ApplicationGuide EN b.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......................................................................................20 4Instructions for Commissioning and Testing...............................................23 4.1Checking the Phase Angle of the Phase Currents......................................................234.2Checking the Basic Threshold Value of the Tripping Characteristic.........................244.2.1Single-End, Three-Phase Symmetrical Infeed...........................................................244.2.2Single-End, Single-Phase Infeed...............................................................................24  Appendix   AVector Groups and Transformer Configurations  – 3 – TransformerDifferential ApplicationGuide EN b.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-sequencecurrent filtering)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  TransformerDifferential ApplicationGuide EN b.doc – 4 – 1   Introduction Protection devices in the MiCOM 30 series are described in detail in the respectiveoperating manuals as regards technical properties, functional characteristics, and properhandling during installation, connection, commissioning, and operation. However, theoperating manuals do not provide any information regarding the philosophy behind eachspecific product or the way in which the functional possibilities of a particular protectiondevice can be used 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 abetter understanding of the design of the individual function blocks and then to providerelated instructions for settings, commissioning, and testing.

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Jul 23, 2017
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