Hitachi Relion 670 Series Commissioning Manual page 134

Section 11
Testing functionality by secondary injection
Imin > 0.10 IBase
Vmax < 0.92 VBase
0.2 £ f(Ucos) £ 8Hz
d ³ PickupAngle
Z cross line ZA - ZC
Z cross line ZC - ZB
N1Limit
N2Limit
ANSI07000100 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 Disabled.
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 (78)) function in the IED can be used for both generator protection
and as well for line protection applications.
The main purpose of the OOSPPAM (78) function is to detect, evaluate, and take the required action
during pole slipping occurrences in the power system.
The OOSPPAM (78) 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.
128
d £ TripAngle
Logic diagram of the pole slip protection PSPPPAM (78)
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AND
AND
AND
AND
Counter
a
b a ³ b
Counter
a
b a ³ b
1MRK506371-UUS Rev. M
PICKUP
ZONE1
ZONE2
TRIP1
AND
TRIP
OR
TRIP2
AND
ANSI07000100_2_en.vsd
GUID-BF2F7D4C-F579-4EBD-9AFC-7C03296BD5D4 v8
Line distance protection REL670
Commissioning manual
SEMOD175096-39 v2