ABB RELION REX640 - Page 1289

-U
2
I
2
RCA=+45 deg
Max
forward
angle
Min
forward
angle
Max
reverse
angle
Min
reverse
angle
Backward
area
Forward
area
Min operate
voltage
Min operate
current
Characteristic
Angle/
Max torque line
Zero torque line
Figure 730: Configurable directional setting when "Neg. seq. volt." selection is made
using the Pol quantity setting
When Zero seq. volt. voltage selection is made using Pol quantity setting, the
directional detector module compares the angle of the residual current to the
residual voltage. Using the residual voltage as reference, the residual current angle
is compared to the Characteristic angle setting. If the angle difference is within the
operating sector selected by the Directional mode setting, the Enable signal is sent
to Timer.
The polarizing quantity (residual voltage) is inverted because of switched
voltage measurement cables, the correction can be done by setting the
Pol reversal setting to "True", which rotates the polarizing quantity by 180
degrees.
The directional characteristic for the measured or calculated residual
power is same.
1MRS759142 F Protection related functions
REX640
Technical Manual
1289