1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
131
Technical Manual
Figure 54:
Functional module diagram
Directional calculation
The directional calculation compares the current phasors to the polarizing phasor. The user
can select the suitable one from 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 117: Polarizing quantities
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.
Polarizing quantity
Description
Pos. seq. volt
Positive sequence voltage
Neg. seq. volt
Negative sequence voltage
Self pol
Self polarization
Cross pol
Cross polarization
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