ABB RELION REX640, Техническое руководство, Страница: 351 / 1960

4.1.2.7 Directional overcurrent characteristics
The forward and reverse sectors are defined separately. The forward operation area
is limited with the Min forward angle and Max forward angle settings. The reverse
operation area is limited with the Min reverse angle and Max reverse angle settings.
The sector limits are always given as positive degree values.
In the forward operation area, the Max forward angle setting gives the
counterclockwise sector and the Min forward angle setting gives the corresponding
clockwise sector, measured from the Characteristic angle setting.
In the backward operation area, the Max reverse angle setting gives the
counterclockwise sector and the Min reverse angle setting gives the corresponding
clockwise sector, a measurement from the Characteristic angle setting that has
been rotated 180 degrees.
Figure 209: Configurable operating sectors
Table 393: Momentary per phase direction value for monitored data view
Criterion for per phase direction information The value for DIR_A/_B/_C
The ANGLE_X is not in any of the defined sectors, or the direc-
tion cannot be defined due too low amplitude
0 = unknown
The ANGLE_X is in the forward sector 1 = forward
Table continues on the next page
1MRS759142 F Protection functions
REX640
Technical Manual
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