ROADir is Relay Operating Angle. ROADir is identifying a window around the
reference direction in order to detect directionality. Figure 178 shows the restrictions
made by the ROADir.
Operate area
ROADir
IEC06000650_2_en.vsd
IEC06000650 V2 EN
Figure 178: 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 179:
1MRK502052-UEN B Section 8
Current protection
395
Technical manual
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