IC=IG
IA=IG
en06000553_ansi.vsd
ANSI06000553 V1 EN-US
Figure 248: The currents in the phases at a double ground fault
The function has a block input (BLOCK) to block start from the function if required in
certain conditions.
8.19.3 Setting guidelines
SEMOD167997-4 v5
The parameters for the Phase preference logic function PPLPHIZ are set via the local
HMI or PCM600.
Phase preference logic function is an intermediate logic between
Distance protection zone, quadrilateral characteristic function
ZMQPDIS (21) and Phase selection with load encroachment,
quadrilateral characteristic function FDPSPDIS
(21). Phase selection
and zones are set according to normal praxis, including
ground-fault
loops, although ground-fault loops will only be active during a cross-
country fault.
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, VBase and SBase as applicable.
OperMode: The operating mode is selected. Choices includes cyclic or acyclic phase
selection in the preferred mode. This setting must be identical for all IEDs in the same
galvanic connected network part.
Section 8 1MRK 504 163-UUS A
Impedance protection
494 Transformer protection RET670 2.2 ANSI
Application manual
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