7.19.3
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 and Phase
selection with load encroachment, quadrilateral characteristic function
FDPSPDIS. Phase selection and zones are set according to normal praxis,
including earth-fault loops, although earth-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),
(
UBase) and (SBase).
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.
UPN<: The setting of the phase-to- earth voltage level (phase voltage) which is used by the
evaluation logic to verify that a fault exists in the phase. Normally in a high impedance earthed
system, the voltage drop is big and the setting can typically be set to 70% of base voltage
(
UBase)
UPP<: The setting of the phase-to-phase voltage level (line voltage) which is used by the
evaluation logic to verify that a fault exists in two or more phases. The voltage must be set to
avoid that a partly healthy phase-to-phase voltage, for example, L2-L3 for a L1-L2 fault, picks-
up and gives an incorrect release of all loops. The setting can typically be 40 to 50% of rated
voltage (
UBase) divided by √3, that is 40%.
3U0>: The setting of the residual voltage level (neutral voltage) which is used by the evaluation
logic to verify that an earth-fault exists. The setting can typically be 20% of base voltage
(
UBase).
IN>: The setting of the residual current level (neutral current) which is used by the evaluation
logic to verify that a cross-country fault exists. The setting can typically be 20% of base
current (
IBase) but the setting shall be above the maximum current generated by the system
earthing. Note that the systems are high impedance earthed which means that the earth-fault
currents at earth-faults are limited and the occurring IN above this level shows that there
exists a two-phase fault on this line and a parallel line where the IN is the fault current level in
the faulty phase. A high sensitivity need not to be achieved as the two-phase fault level
normally is well above base current.
tIN: The time delay for detecting that the fault is cross-country. Normal time setting is 0.1 -
0.15 s.
tUN: The time delay for a secure UN detecting that the fault is an earth-fault or double earth-
fault with residual voltage. Normal time setting is 0.1 - 0.15 s.
tOffUN: The UN voltage has a reset drop-off to ensure correct function without timing
problems. Normal time setting is 0.1 s
1MRK 505 343-UEN B
Section 7
Impedance protection
399
Application manual
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