ABB RER620 Technical Manual page 158

Section 4
Protection functions
152
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 clockwise sector
and the Min forward angle setting correspondingly the anti-clockwise sector, measured
from the Characteristic angle setting.
In the reverse operation area, the Max reverse angle setting gives the clockwise sector and
the Min reverse angle setting correspondingly the anti-clockwise sector, measured from
the complement of the Characteristic angle setting (180 degrees phase shift).
The relay characteristic angle (RCA) is set to positive if the operating current lags the
polarizing quantity. It is set to negative if it leads the polarizing quantity.
1MAC309294-MB F
RER620
Technical Manual