Completing The Test; Out-Of-Step Protection Oosppam - Hitachi RED670 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 40:
11.4.11.2

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if 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.
134
Imin > 0.10 IBase
d ³ StartAngle
d £ TripAngle
Logic diagram of the pole slip protection PSPPPAM
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AND
AND
AND
AND
Counter
a
b a ³ b
Counter
a
b a ³ b
1MRK 505 378-UEN Rev. K
START
ZONE1
ZONE2
TRIP1
AND
TRIP
OR
TRIP2
AND
IEC07000100_2_en.vsd
GUID-BF2F7D4C-F579-4EBD-9AFC-7C03296BD5D4 v8
Line differential protection RED670
Commissioning manual
SEMOD175096-39 v2