ABB REL650 series Technical Manual page 245

1MRK 506 335-UUS A
Technical manual
ANSI06000650 V2 EN
Figure 108: Characteristic with ROADir restriction
The function indicates forward/reverse direction to the fault. Reverse direction is defined
as 3I ·cos (φ + 180°) ≥ the set value.
0
It is also possible to tilt the characteristic to compensate for current transformer angle error
with a setting RCAComp as shown in the figure 109:
3I Operate area
0
-3V
3I cos
0
ROA
Section 7
Current protection
=-
=V RCA = 0°
V 3V
ref o
0 ref
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