ABB Relion 650 Series Technical Manual page 193

1MRK 506 326-UUS B
There is a possibility to increase the operate level for currents where the angle φ is larger than a
set value as shown in figure 98. This is equivalent to blocking of the function if φ >
option is used to handle angle error for the instrument transformers.
ANSI06000650 V1 EN-US
Figure 98: 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
Line distance protection REL650
Technical manual
3I
ROA
RCAComp as shown in the figure 99:
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3I Operate area
0
-3V =V
0
cos
0
RCA = 0°
ref
en06000650_ansi.vsd
Section 6
Current protection
ROADir . This
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