ABB REB670 Series, Applications Manual

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13.14.2 Application
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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.
13.14.3 Setting guidelines
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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 RefSource is selected as SetValue. 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 % 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.
13.14.4 Setting example
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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
EqualBandHigh = 5.0 % of reference value
EqualBandLow = 5.0 % of reference value
Operation
Section 13 1MRK 505 370-UEN D
Logic
350 Busbar protection REB670
Application manual