Setting Example - ABB REG670 Applications Manual

Section 16
Logic
16.15.4
620
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,
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.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
1MRK 502 071-UEN -
Application manual