Settings; Operation Principle - Hitachi Relion 650 Series Technical Manual

1MRK 511 557-UEN Rev. A
Table 160: REALCOMP Output signals
Name
INEQUAL
INHIGH
INLOW
11.10.5

Settings

Table 161: REALCOMP Group settings (basic)
Name Values (Range)
EnaAbs
RefSource
SetValue
SetValPrefix
EqualBandHigh
EqualBandLow
11.10.6

Operation principle

The comparison can be done in two ways,
1. Between 2 inputs, INPUT and REF
2. Between INPUT and the SetValue setting
The selection of reference value for comparison is done through setting RefSource. If RefSource is
selected as "Input REF" then the reference value for comparison is taken from second input signal
(REF). If RefSource is selected as "Set Value" then the reference value for comparison is taken from
setting (SetValue).
Generally the inputs to the function are in units, but when the comparison is to be done with respect
to set level, then the user can scale the reference value in steps of 1000, as per the setting RefPrefix.
Internally the function handles the reference value for comparator as SetValue*RefPrefix.
Additionally the comparison can be done either between absolute values or signed values, which is
determined by the setting EnaAbs. If EnaAbs is selected as "Absolute" then both input and reference
values are converted into absolute values and then comparison is done. If EnaAbs is selected as
"Signed" then the comparison is done without absolute conversion.
This function has two settings EqualBandHigh and EqualBandLow to provide margins from reference
value for equal to condition. When the INPUT value is within high and low band around the reference
value, output INEQUAL will get set.
In order to avoid oscillations at boundary conditions of equal band low limit and high limit, hysteresis
has been provided. If the INPUT is above the equal high level margin including hysteresis, then
INHIGH will set. Similarly if the INPUT is below the equal low level margin including hysteresis, then
INLOW will set.
Technical Manual
Type
BOOLEAN
BOOLEAN
BOOLEAN
Unit
Signed -
Absolute
Set Value -
Input REF
-999.999 - 999.999 -
milli -
unit
kilo
Mega
Giga
0.10 - 50.00 %
0.10 - 50.00 %
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Description
Input value is equal to the reference value
Input value is higher than the reference value
Input value is lower than the reference value
Step Default
- Signed
- Set Value
0.001 0.001
- unit
0.01 0.50
0.01 0.50
PID-7248-OUTPUTSIGNALS v1
Description
Selection for absolute or signed
comparison
Selection for reference value either input
or setting
Set value for reference
Multiplication factor for SetValue
Equal band high limit in % of reference
value
Equal band low limit in % of reference
value
GUID-3FA699A8-D076-4E5E-BCB8-C6B7907573D1 v3
Section 11
Logic
PID-7248-SETTINGS v1
151