ABB Relion 670 Series Applications Manual page 474

Section 17
Logic
17.14.2 Identification
Function description
Comparator for real inputs
17.14.3 Application
The function gives the possibility to monitor the level of real values in the system relative to
each other or to a fixed value. It is a basic arithmetic function that can be used for monitoring,
supervision, interlocking and other logics.
17.14.4 Setting guidelines
Setting procedure on the IED:
EnaAbs : This setting is used to select the comparison type between signed and absolute
values.
Absolute : Comparison is performed with absolute values of input and reference.
•
Signed : Comparison is performed with signed values of input and reference.
•
RefSource : This setting is used to select the reference source between input and setting for
comparison.
Input REF : The function will take reference value from input REF
•
Set Value : The function will take reference value from setting SetValue
•
SetValue : This setting is used to set the reference value for comparison when setting
RefSource is selected as Set Value . If this setting value is less than 0.2% of the set unit then the
output INLOW will never pickup.
RefPrefix : This setting is used to set the unit of the reference value for comparison when
setting
Mega and Giga.
EqualBandHigh : This setting is used to set the equal condition high band limit in % of
reference value. This high band limit will act as reset limit for INHIGH output when INHIGH.
EqualBandLow : This setting is used to set the equal condition low band limit in % of reference
value. This low band limit will act as reset limit for INLOW output when INLOW.
17.14.5 Setting example
Let us consider a comparison is to be done between current magnitudes in the range of 90 to
110 with nominal rating is 100 and the order is kA.
For the above condition the comparator can be designed with settings as follows,
EnaAbs = Absolute
RefSource = Set Value
SetValue = 100
RefPrefix = Kilo
468
RefSource is selected as SetValue . It has 5 unit selections and they are Milli, Unity, Kilo,
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IEC 61850 IEC 60617
identification identification
REALCOMP Real<=>
1MRK 511 401-UEN Rev. K
GUID-0D68E846-5A15-4C2C-91A2-F81A74034E81 v1
ANSI/IEEE C37.2
device number
GUID-5F7B1683-9799-4D27-B333-B184F8861A5B v1
GUID-DE69FF5B-7D34-4A30-9060-214E98BFF798 v2
GUID-E7070CF6-B44B-4799-BE18-5C75B9FE2A87 v2
Bay control REC670
Application manual