IC=IG
IA=IG
en06000553_ansi.vsd
ANSI06000553 V1 EN
Figure 246: 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
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.
PU27PN: The setting of the phase-to- ground voltage level (phase voltage) which is used
by the evaluation logic to verify that a fault exists in the phase. Normally in a high
Section 8 1MRK 506 369-UUS -
Impedance protection
480 Line distance protection REL670 2.2 ANSI
Application manual
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