
•
If the fault has caused tripping, the trip endures.
•
If the fault was detected in the reverse direction, the measuring element in the
reverse direction remains in operation.
•
If the current decreases below the minimum operating value, the memory resets and
no directional indications will be given until the positive sequence voltage exceeds
10% of its rated value.
6.6
Phase preference logic PPLPHIZ
6.6.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase preference logic
PPLPHIZ
-
-
6.6.2
Functionality
Phase preference logic function PPLPHIZ is intended to be used in isolated or high
impedance grounded networks where there is a requirement to trip only one of the faulty
lines at cross-country fault.
Phase preference logic inhibits tripping for single phase-to-ground faults in isolated and
high impedance grounded networks, where such faults are not to be cleared by distance
protection. For cross-country faults, the logic selects either the leading or the lagging
phase-ground loop for measurement and initiates tripping of the preferred fault based on
the selected phase preference. A number of different phase preference combinations are
available for selection.
6.6.3
Function block
ANSI09000060-1-en.vsd
PPLPHIZ
I3P*
V3P
BLOCK
RELAG
RELBG
RELCG
PHSEL
PICKUP
ZREL
ANSI09000060 V1 EN
Figure 80:
PPLPHIZ function block
Section 6
1MRK 506 335-UUS A
Impedance protection
170
Technical manual
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