9.1.4 SignalsTable 149:CCSRDIF Input signalsName Type Default DescriptionI3P GROUPSIGNAL- Three phase group signal for current inputsIREF GROUPSIGNAL- Group signal for current referenceBLOCK BOOLEAN 0 Block of functionTable 150:CCSRDIF Output signalsName Type DescriptionFAIL BOOLEAN Detection of current circuit failureALARM BOOLEAN Alarm for current circuit failure9.1.5 SettingsTable 151:CCSRDIF Group settings (basic)Name Values (Range) Unit Step Default DescriptionOperation OffOn- - Off Operation Off / OnIMinOp 5 - 200 %IB 1 20 Minimum operate current differential levelin % of IBaseTable 152:CCSRDIF Group settings (advanced)Name Values (Range) Unit Step Default DescriptionIp>Block 5 - 500 %IB 1 150 Block of the function at high phasecurrent, in % of IBaseTable 153:CCSRDIF Non group settings (basic)Name Values (Range) Unit Step Default DescriptionGlobalBaseSel 1 - 6 - 1 1 Selection of one of the Global Base Valuegroups9.1.6 Operation principleCurrent circuit supervision CCSRDIF compares the absolute value of the vectorialsum of the three phase currents |ΣIphase| and the numerical value of the residualcurrent |Iref| from another current transformer set, see figure 87.The FAIL output will be set to a logical one when the following criteria are fulfilled:Section 9 1MRK 511 287-UEN ASecondary system supervision192Technical manual
