ABB REB670 - Setting Example

• 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
GUID-E7070CF6-B44B-4799-BE18-5C75B9FE2A87 v2
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.
Section 13 1MRK 505 370-UUS A
Logic
424 Busbar protection REB670 2.2 ANSI
Application manual