ABB RELION 620 Series Technical Manual page 352

Section 4
Protection functions
346
RCA=+45 deg
forward
Min
forward
angle
Min trip current
GUID-4C549313-56D5-4D7A-8E3C-37885AF1BF82-ANSI V1 EN
Figure 156: Configurable directional setting when "Neg. seq. volt." selection is made
using Pol signal Sel.
When "Measured VG" or "Calculated VN" voltage selection is made using Pol signal Sel
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.
"Measured IG" or "Calculated IN" (residual current) can be selected with
the Io signal Sel setting.
The "Measured VG", "Calculated VN" (residual voltage) can be selected
with the Pol signal Sel setting.
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 operating sector is defined by the settings Max forward angle, Max reverse angle, Min
forward angle and Min reverse angle. The options that can be selected for the Directional
mode settings are "Forward" and "Reverse".
The directional characteristic for the measured or calculated residual
power is same.
2
Max
angle
2
Min
reverse
angle
Min trip voltage
Max
reverse
angle
1MAC504801-IB E
620 series ANSI
Technical Manual