ROADir is Relay Operating Angle. ROADir is identifying a window around the
reference direction in order to detect directionality. Figure 106 shows the
restrictions made by the ROADir.
Operate area
ROADir
IEC06000650_2_en.vsd
IEC06000650 V2 EN-US
Figure 106: Characteristic with ROADir restriction
The function indicates forward/reverse direction to the fault. Reverse direction is
defined as 3I
0
·cos (φ + 180°) ≥ the set value.
It is also possible to tilt the characteristic to compensate for current transformer
angle error with a setting RCAComp as shown in the Figure 107:
1MRK 506 382-UEN A Section 7
Current protection
Line distance protection REL650 2.2 IEC 225
Technical manual
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