ABB RES670 Technical Manual page 243

1MRK 511 408-UUS A
Phasor measurement unit RES670 2.2 ANSI
Technical manual
ANSI06000650 V3 EN-US
Figure 73: 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 74:
 0
RCADir
3I
0
Trip area

3  
I cos
0
ROADir
ANSI06000650-3-en.vsd
Section 8
Current protection
 
3 V V
0 ref
237