ABB Relion 670 Series Applications Manual page 377
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1MRK 505 370-UUS Rev. K
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Absolute: Comparison is performed with absolute values of input and reference.
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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.
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Input REF: The function will take reference value from input REF
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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.
13.14.5
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
EqualBandHigh = 5.0 % of reference value
EqualBandLow = 5.0 % of reference value
Operation
The function will set the outputs for the following conditions,
INEQUAL will set when the INPUT is between the ranges of 95 to 105 kA.
INHIGH will set when the INPUT crosses above 105 kA.
INLOW will set when the INPUT crosses below 95 kA.
If the comparison should be done between two current magnitudes then those current signals need to be
connected to function inputs, INPUT and REF. Then the settings should be adjusted as below,
EnaAbs = Absolute
Busbar protection REB670
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Section 13
Logic
GUID-E7070CF6-B44B-4799-BE18-5C75B9FE2A87 v2
371
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