CHAPTER 5: SETPOINTS
5.4 PROTECTION ELEMENTS
GEK-106310-AF
F650 DIGITAL BAY CONTROLLER
5-63
Figure 5-8: Overcurrent elements block configuration by the directional element
Directional elements can also be blocked with signals coming from other relays, PLCs, or through signals configured in the
relay PLC Editor (Logic configuration tool). The signal used in that case is PHASE DIR BLK INP. Figure 5-9: Directional
element blosk configuration by input shows an example of the default block configuration of directional elements by
digital input. There is one block signal per input for each setting group.
Figure 5-9: Directional element blosk configuration by input
The main component of the phase directional element is the angle comparator with two inputs: the operation magnitude
(phase current) and the polarization magnitude (phase-to-phase voltage rotated the angle set in MTA setting), which is the
torque angle.
The Polarization type used in the directional element is crossed, this means that in case of a fault in phase A, the Operation
magnitude is Ia, and the polarization magnitude is Vbc, rotated by the torque angle. In case of a fault in phase B, the
operation magnitude is Ib, and the polarization magnitude is Vca rotated by the torque angle. Finally, in case of a fault in
phase C, the operation magnitudes is Ic, and Vab.
Table 5-34: Operation and polarization magnitudes for directional units
POLARIZING SIGNAL VPOL
PHASE
OPERATING SIGNAL
ABC PHASE SEQUENCE
ACB PHASE SEQUENCE
A
IA angle
VBC angle x 1 MTA
VCB angle x 1 MTA
B
IB angle
VCA angle x 1 MTA
VAC angle x 1 MTA
C
IC angle
VAB angle x 1 MTA
VBA angle x 1 MTA
Summary of Contents for F650
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