0.2
£
f(Ucos)
£
8Hz
AND
AND
START
Z cross line ZA - ZC
Z cross line ZC - ZB
AND
AND
ZONE1
ZONE2
Counter
a
b a
³
b
AND
TRIP1
Counter
a
b a
³
b
AND
TRIP2
OR
TRIP
IEC07000100_2_en.vsd
Imin > 0.10
IBase
Umax < 0.92 UBase
d
³
StartAngle
N1Limit
d
£
TripAngle
N2Limit
IEC07000100 V2 EN-US
Figure 49: Logic diagram of the pole slip protection PSPPPAM
12.4.10.2
Completing the test
SEMOD175096-39 v2
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.4.11
Out-of-step protection OOSPPAM
GUID-BF2F7D4C-F579-4EBD-9AFC-7C03296BD5D4 v7
The out-of-step protection OOSPPAM function in the IED can be used for both generator
protection and as well for line protection applications.
The main purpose of the OOSPPAM function is to detect, evaluate, and take the required
action during pole slipping occurrences in the power system.
The OOSPPAM function detects pole slip conditions and trips the generator as fast as
possible, after the first pole-slip if the center of oscillation is found to be in zone 1, which
normally includes the generator and its step-up power transformer. If the center of oscillation
is found to be further out in the power system, in zone 2, more than one pole-slip is usually
allowed before the generator-transformer unit is disconnected. A parameter setting is
available to take into account the circuit breaker opening time. If there are several out-of-step
relays in the power system, then the one which finds the center of oscillation in its zone 1
should operate first.
Two current channels I3P1 and I3P2 are available in OOSPPAM function to allow the direct
connection of two groups of three-phase currents; that may be needed for very powerful
generators, with stator windings split into two groups per phase, when each group is
equipped with current transformers. The protection function performs a simple summation of
the currents of the two channels I3P1 and I3P2.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
131
Commissioning manual
