ABB RED615 Technical Manual page 208

Section 4
Protection functions
202
GUID-347973B8-AB04-40ED-B985-3F36A6305066 V1 EN
Figure 100: 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 212: 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. Either
"Non-directional", "Forward" or "Reverse" operation can be selected. By setting
the value of Allow Non Dir to "True", the non-directional operation is allowed
when the directional information is invalid.
Description
Positive-sequence voltage
Negative-sequence voltage
Self-polarization
Cross-polarization
1YHT530004D05 D
615 series
Technical Manual