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A.1.2.8 REVERSE UNBALANCES (THREE-PHASE CONNECTION – OVER ONE SECOND)
These are calculated from the filtered RMS vector values (over one second) VFrms[i] and AFrms[i] for distribution systems
with neutral and UFrms[i] and AFrms[i] for distribution systems without neutral (ideally the fundamental vectors of the
signals).
NOTE: The operations are vector operations in complex notation with:
Forward phase-to-neutral voltage (vector) in a distribution system with neutral:
Reverse phase-to-neutral voltage (vector) in a distribution system with neutral:
Phase-to-neutral voltage unbalance in a distribution system with neutral:
Forward phase-to-phase voltage (vector) in a distribution system without neutral:
Reverse phase-to-phase voltage (vector) in a distribution system with neutral:
Phase-to-phase voltage unbalance in a distribution system with neutral:
Forward current (vector):
Reverse current (vector):
Current unbalance (vector):
112
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