Relay characteristic angle (RCA) is set to positive if the operating current lags the
polarizing quantity and negative if the operating current leads the polarizing quantity.
Reverse
area
Forward
area
RCA = + 60 deg
Min forward
angle
Max forward
angle
Max reverse
angle
Min reverse
angle
Non
-
operating area
Non
-
operating area
U
A
I
A
GUID-BBCBE38C-3402-46DD-A3CC-AFFF2A73E8BA V1 EN
Figure 54: Configurable operating sectors
Table 63 and Table 64 describe conditions under which per phase fault direction and
combined fault directions values are calculated.
Table 63: Per phase fault direction indication
Criterion for per phase fault direction information
Value for fault direction FLT_A, FLT_B, FLT_C
Angle between the polarizing and operating
quantity is not in any of the defined sectors
0 = unknown
Angle between the polarizing and operating
quantity is in the forward sector
1 = forward
Angle between the polarizing and operating
quantity is in the reverse sector
2 = backward
Angle between the polarizing and operating
quantity is in both the forward and the reverse
sectors, that is, the sectors are overlapping
3 = both
1MRS757488 H Section 6
Commissioning
RIO600 95
Installation and Commissioning Manual
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