Stabilization is included for inrush and overexcitation currents respectively, cross-blocking is also available. Adaptive stabilization is also included for system recoveryinrush and CT saturation during external faults. A high set unrestrained differentialcurrent protection element is included for a very high speed tripping at a high internalfault currents.Included is an innovative sensitive differential protection element based on the theoryof symmetrical components. This element offers the best possible coverage of powertransformer windings turn to turn faults.6.1.2 Transformer differential protection, two winding T2WPDIF6.1.2.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberTransformer differential protection, two-windingT2WPDIF3Id/ISYMBOL-BB V1 EN87T6.1.2.2 Function blockT2WPDIFI3PW1CT1*I3PW2CT1*BLOCKTRIPTRIPRESTRIPUNRETRNSUNRTRNSSENSSTARTSTL1STL2STL3BLK2HBLK5HBLKWAVIDALARMIDL1MAGIDL2MAGIDL3MAGIBIASIDNSMAGIEC09000274_1_en.vsdIEC09000274 V1 ENFigure 30: T2WPDIF function block6.1.2.3 SignalsTable 24:T2WPDIF Input signalsName Type Default DescriptionI3PW1CT1 GROUPSIGNAL- Three phase current connection winding 1 (W1)CT1I3PW2CT1 GROUPSIGNAL- Three phase current connection winding 2 (W2)CT1BLOCK BOOLEAN 0 Block of functionSection 6 1MRK 504 135-UEN ADifferential protection80Technical manual
