Setting Guidelines - ABB REL650 Applications Manual

Section 6
Impedance protection
6.5.3
156
The function has a block input (BLOCK) to block start from the function if required in
certain conditions.

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 Five zone distance
protection, quadrilateral characteristic (ZQDPDIS, 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).
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
impedance grounded system, the voltage drop is big and the setting can typically be set to
70% of base voltage (VBase)
PU27PP: 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, B-C for a A-B
fault, picks-up and gives an incorrect release of all loops. The setting can typically be 70%
of base voltage (VBase) divided by √3, that is 40%.
3V0PU: The setting of the residual voltage level (neutral voltage) which is used by the
evaluation logic to verify that an ground-fault exists. The setting can typically be 20% of
base voltage (VBase).
Pickup_N: 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 grounding. Note that the systems are high impedance grounded which
means that the ground-fault currents at ground-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
1MRK 506 334-UUS A
Application manual