6.4.8
Technical data
SEMOD175136-2 v8
Table 57:
OOSPPAM technical data
Function
Range or value
Accuracy
Impedance reach
(0.00 - 1000.00)% of Zbase
±2.0% of U
r
/(√3 ⋅ I
r
)
Rotor start angle
(90.0 - 130.0) degrees
±5.0 degrees
Rotor trip angle
(15.0 - 90.0) degrees
±5.0 degrees
Zone 1 and Zone 2 trip counters
(1 - 20)
-
6.5
Phase preference logic PPL2PHIZ
GUID-80133640-FB3E-400C-B7FF-C2BB0AD1A045 v1
6.5.1
Identification
GUID-850E4134-E912-45EC-981E-E1A2C12A91A8 v1
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase preference logic
PPL2PHIZ
-
-
6.5.2
Functionality
GUID-39785DEB-E5D7-447C-977B-9E940CA8E774 v1
The Phase preference logic function (PPL2PHIZ) is used with the high speed
distance protection, quad and mho characteristic (ZMFPDIS). It is intended to be
used in isolated or high impedance earthed networks where there is a requirement
to operate on only one of the faulty lines during a cross-country fault. It can be
used without preference to restrain operation for single earth faults with a delayed
zero-sequence current release.
For cross-country faults, the logic selects either the leading or lagging phase-earth
loop for measurement. It initiates operation on the preferred fault based on the
selected phase preference. A number of different phase preference combinations
are available for selection.
PPL2PHIZ provides an additional phase selection criteria, namely under voltage
criteria, suitable for cross-country faults. In radial networks, where there is no fault
current in the phase with the external fault, current or impedance based phase
selection methods become ineffective. Hence, only voltage can be used for phase
selection. The phase selection result will be the same for all bays on a bus since the
voltage is the same, which is an important condition for operating with phase
preference.
In meshed and stronger networks, it is difficult to find appropriate under-voltage or
phase selection settings. If PPL2PHIZ is unable to detect both faulty phases, then it
is not possible to provide preference. The distance protection will still be released
however, without preference. The final result might be that both faulty feeders are
Section 6
1MRK 506 382-UEN A
Impedance protection
148
Line distance protection REL650 2.2 IEC
Technical manual
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