Setting Example - ABB REQ650 Applications Manual

Section 10
Logic
10.13.4
212
• 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.

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,
1MRK 505 383-UEN A
GUID-E7070CF6-B44B-4799-BE18-5C75B9FE2A87 v2
Breaker protection REQ650 2.2 IEC
Application manual