ABB RER620 Technical Manual page 273

1MAC309294-MB F
RER620
Technical Manual
The directional characteristic for measured or calculated residual power is
same.
Min forward
angle
Non-operating area
Min operate voltage
Max reverse
angle
Min operate current
Figure 132: Configurable directional setting for "Measured V
(residual voltage) using Pol signal Sel setting
The Characteristic angle setting is done based on method of grounding employed in the
network. For example in case of isolated network the Characteristic angle is set equal to
-90˚, in case of compensated network the Characteristic angle is set equal to 0˚ and 60˚
for solidly grounded systems. In general Characteristic angle is selected so that it matches
close to the expected fault angle value, which results into maximum sensitivity. The
Characteristic angle can be set anywhere between -179˚ to +180˚. Figure 133 and Figure
134 show examples of the operating area with RCA set to +60˚ and -90˚, respectively.
Characteristic angle/
Max torque line
-VG ( polarizing quantity)
Forward
area
IG ( operating quantity)
Max forward
Backward
area
Section 4
Protection functions
RCA = 0 deg
angle
Zero torque line
Non-operating area
Min reverse
angle
" or "Calculated V
G
"
N
267