EE 423
Symmetrical Components
Define a:
Sequence Matrix
phase A reference
phase B reference
phase C reference
Define a balanced three phase current
signals
If we used B phase reference sequence matrix and recompute the sequence components
Notice the magnitude in the positive sequence is identical and the phase shift of -120 is reflected when we used the B phase reference sequence matrix.
Let us examine the sequence components if the magnitudes of phase A and B are
changed to zero (Currents at the fault location for a phase C to ground fault).
Redefining the phase matrix:
Unless otherwise mentioned use phase A reference sequence components:
Notice the sequence magnitudes are identical to each other. This relationship holds good for any single phase to ground fault.