ABB RED650, Technical Manual, Page: 501 / 926

Internal
Hysteresis for
equal band
Equal Band
EqualBandHigh
EqualBandLow
REF or SetValue
INEQUAL Reset / INHIGH Set INEQUAL Set / INHIGH Reset
INEQUAL Reset / INLOW Set INEQUAL Set / INLOW Reset
IEC15000261-1-en.vsdx
IEC15000261 V1 EN-US
Figure 251: Operation principle of REALCOMP
When EnaAbs is set as absolute comparison and SetValue is set less
than 0.2% of the set unit then INLOW output will never pickups.
During the above mentioned condition, due to marginal value for
avoiding oscillations of function outputs, the INLOW output will
never set.
14.16.7 Technical data
GUID-62792FCB-B436-4034-9A08-C9FF918FF547 v1
REALCOMP function can compare the values from milli value level to giga value
level and the maximum expectable accuracy level from the function is 10 µ.
GUID-3FDD7677-1D86-42AD-A545-B66081C49B47 v3
Table 340: Number of REALCOMP instances
Function Quantity with cycle time
3 ms 8 ms 100 ms
REALCOMP 10 10 10
1MRK 505 394-UEN A
Section 14
Logic
Line differential protection RED650 2.2 IEC 495
Technical manual