ABB RED615 Technical Manual page 184

Section 4
Protection functions
178
GUID-C5892F3E-09D9-462E-A963-023EFC18DDE7 V3 EN
Figure 85: Functional module diagram
Directional calculation
The directional calculation compares the current phasors to the polarizing phasor.
A suitable polarization quantity can be selected from the different polarization
quantities, which are the positive sequence voltage, negative sequence voltage, self-
polarizing (faulted) voltage and cross-polarizing voltages (healthy voltages). The
polarizing method is defined with the Pol quantity setting.
Table 192: Polarizing quantities
Polarizing quantity
Pos. seq. volt
Neg. seq. volt
Self pol
Cross pol
The directional operation can be selected with the Directional mode setting. The
user can select either "Non-directional", "Forward" or "Reverse" operation. By
setting the value of Allow Non Dir to "True", the non-directional operation is
allowed when the directional information is invalid.
The Characteristic angle setting is used to turn the directional characteristic. The
value of Characteristic angle should be chosen in such a way that all the faults in
the operating direction are seen in the operating zone and all the faults in the
opposite direction are seen in the non-operating zone. The value of Characteristic
angle depends on the network configuration.
Description
Positive sequence voltage
Negative sequence voltage
Self polarization
Cross polarization
1YHT530004D05 D
615 series
Technical Manual