Completing The Test - ABB RET670 Commissioning Manual

1MRK 504 154-UUS B
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
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Figure 30: Logic diagram of the pole slip protection PSPPPAM (78)
10.4.11.2

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.
10.4.12 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
Commissioning manual
d £ TripAngle
AND
AND
AND
AND
Counter
a
b a ³ b
Counter
a
b a ³ b
Testing functionality by secondary injection
PICKUP
ZONE1
ZONE2
TRIP1
AND
TRIP
OR
TRIP2
AND
ANSI07000100_2_en.vsd
TestMode setting to Disabled .
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