Setting Example - ABB Relion REC670 Applications Manual

1MRK 511 358-UEN A
RefSource : This setting is used to select the reference source between input and setting for
comparison.
REF : The function will take reference value from input REF
•
SetValue : 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 SetValue . If this setting value is less than 0.2% of the set unit then the
output INLOW will never pickups.
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 is
high in last execution.
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 is high in last
execution.
15.14.4

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 = SetValue
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
RefSource = REF
Application manual
RefSource is selected as SetValue . It has 5 unit selections and they are Milli, Unity, Kilo,
Section 15
Logic
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