14.14 Comparator for real inputs - REALCOMP14.14.1 Identification GUID-0D68E846-5A15-4C2C-91A2-F81A74034E81 v1Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberComparator for real inputs REALCOMP Real<=>14.14.2 Application GUID-5F7B1683-9799-4D27-B333-B184F8861A5B v1The function gives the possibility to monitor the level of real values in the system relative toeach other or to a fixed value. It is a basic arithmetic function that can be used for monitoring,supervision, interlocking and other logics.14.14.3 Setting guidelines GUID-DE69FF5B-7D34-4A30-9060-214E98BFF798 v1Setting procedure on the IED:EnaAbs: This setting is used to select the comparison type between signed and absolutevalues.•Absolute: The function will do absolute comparison between input and reference value.•Signed: The function will do signed comparison between input and reference value.RefSource: This setting is used to select the reference source between input and setting forcomparison.•REF: The function will take reference value from input REF•SetValue: The function will take reference value from settingSetValueSetValue: This setting is used to set the reference value for comparison when settingRefSource is selected asSetValue. If this setting value is less than 0.2% of the set unit then theoutput INLOW will never pickups.RefPrefix: This setting is used to set the unit of the reference value for comparison whensettingRefSource is selected asSetValue. It has 5 unit selections and they are Milli, Unity, Kilo,Mega and Giga.EqualBandHigh: This setting is used to set the equal condition high band limit in % ofreference value. This high band limit will act as reset limit for INHIGH output when INHIGH ishigh in last execution.EqualBandLow: This setting is used to set the equal condition low band limit in % of referencevalue. This low band limit will act as reset limit for INLOW output when INLOW is high in lastexecution.14.14.4 Setting example GUID-E7070CF6-B44B-4799-BE18-5C75B9FE2A87 v1Let us consider a comparison is to be done between current magnitudes in the range of 90 to110 with nominal rating is 100 and the order is kA.For the above condition the comparator can be designed with settings as follows,Section 14 1MRK 505 363-UEN ALogic280Application manual
