IC=IG
IA=IG
en06000553_ansi.vsd
ANSI06000553 V1 EN
Figure 178: 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.
3.6.14.2 Setting guidelines
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.
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.
VBase: Base voltage level in kV. The base voltage is used as reference for the voltage
setting factors. Normally it is set to the system voltage level (phase to phase).
1MRK504116-UUS C Section 3
IED application
393
Application manual
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