Comparator For Real Inputs - Realcomp; Identification; Application; Setting Guidelines - ABB RELION 650 Series Applications Manual

Section 12
Logic
12.14

Comparator for real inputs - REALCOMP

12.14.1

Identification

Function description
Comparator for real inputs
12.14.2

Application

The function gives the possibility to monitor the level of real values in the system relative to
each other or to a fixed value. It is a basic arithmetic function that can be used for monitoring,
supervision, interlocking and other logics.
12.14.3

Setting guidelines

Setting procedure on the IED:
EnaAbs : This setting is used to select the comparison type between signed and absolute
values.
• Absolute : The function will do absolute comparison between input and reference value.
Signed : The function will do signed comparison between input and reference value.
•
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.
12.14.4

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,
196
RefSource is selected as SetValue . It has 5 unit selections and they are Milli, Unity, Kilo,
IEC 61850 IEC 60617
identification identification
REALCOMP Real<=>
1MRK 504 158-UEN A
GUID-0D68E846-5A15-4C2C-91A2-F81A74034E81 v1
ANSI/IEEE C37.2
device number
GUID-5F7B1683-9799-4D27-B333-B184F8861A5B v1
GUID-DE69FF5B-7D34-4A30-9060-214E98BFF798 v1
GUID-E7070CF6-B44B-4799-BE18-5C75B9FE2A87 v1
Application manual