Completing The Test; Out-Of-Step Protection Oosppam - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
Umax < 0.92 UBase
0.2 £ f(Ucos) £ 8Hz
Z cross line ZA - ZC
Z cross line ZC - ZB
N1Limit
N2Limit
IEC07000100 V2 EN-US
Figure 42: Logic diagram of the pole slip protection PSPPPAM
11.4.11.2

Completing the test

continue to test another function or end the test by changing the
Restore connections and settings to their original values, if they were changed for testing
purposes.
11.4.12

Out-of-step protection OOSPPAM

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.
140
Imin > 0.10 IBase
d ³ StartAngle
d £ TripAngle
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AND
AND
AND
AND
Counter
a
b a ³ b
Counter
a
b a ³ b
1MRK 504 165-UEN E
START
ZONE1
ZONE2
TRIP1
AND
TRIP
OR
TRIP2
AND
IEC07000100_2_en.vsd
TESTMODE setting to Off .
GUID-BF2F7D4C-F579-4EBD-9AFC-7C03296BD5D4 v8
Transformer protection RET670
Commissioning manual
SEMOD175096-39 v2