Zero-sequence filtering for the transformer ends a, b, c or d is enabled using the
setting parameters:
●
DIFF: 0-seq. filt.a en.PSx
●
DIFF: 0-seq. filt.b en.PSx
●
DIFF: 0-seq. filt.c en.PSx
●
DIFF: 0-seq. filt.d en.PSx
Table 3-2, (p. 3-130) lists the required operations for all vector groups that may
occur. The indices in the equations have the following meanings:
am: amplitude-matched
s: amplitude- and vector group-matched
x: phase A, B or C
y: measuring system 1, 2 or 3
z: end a, b, c or d
x+1: cyclically trailing phase
x-1: cyclically leading phase
3 Operation P634
P634/EN M/R-42-A // P634‑311‑653 3-129
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