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5 FUNCTIONAL TESTS (FACTORY SETTINGS)
5.5 MOB TESTING
1.
Record the pre-test values of the Protection Settings used for this test.
2.
Settings:
OS BLOCKING
(1601)
MOBZONE = 0 (Zone 2)
(1603)
BLOCKWHAT = 0 (BLKALL)
Z1DISTANCE
(101)
Z1PHASE = NO
(104)
Z1GROUND = NO
Z2DISTANCE
(201)
Z2PHASE = YES
(204)
Z2GROUND = NO
Z3DISTANCE
(301)
Z3PHASE = NO
(304)
Z3GRND = NO
Z4DISTANCE
(401)
Z4PHASE = NO
(405)
Z4GRND = NO
3.
Connect the relay as shown in Figure 5–1: PHASE-TO-PHASE TEST CONNECTIONS on page 5–6 for the appropri-
ate phase under test.
4.
Set the relay to test mode 40 (Out of Step). The LUI displays the following: OUT OF STEP ON
Set the voltage inputs as follows: VA: 75 V rms ∠0°, VB: 75 V rms ∠–120°, VC: 75 V rms ∠+120°.
5.
6.
Set the fault current, I
, to the phase-angle value listed in the Table below. Note that the leading phase angle is 180°
op
out of phase with the line to which it is shorted.
∠I DEGREES
VOLTS RMS
–85
62 to 72
–25
62 to 72
7.
Set the currents in the faulted phases to 6.3 (1.3) amps rms. Reduce the voltages of the faulted phases and check that
the A1 contact closes when the voltages are within the limits shown in the table above.
8.
Reduce the current in the faulted phase to zero.
9.
Repeat the test for phases BC and CA. Return settings to their pre-test values when finished testing.
Ensure that the relay is no longer in test mode by selecting END TEST MODE from the test mode menu. Print out or scroll
through all the settings. Compare them with the initial settings of the relay, and change to initial values. If the initial settings
were saved to a disk file with ALPS-Link before testing, download the file to the relay.
GE Power Management
ALPS Advanced Line Protection System
5.5 MOB TESTING
5.5.1 T21 – OUT-OF-STEP REACH, MOB
5.5.2 ENDING FUNCTIONAL TESTS
5
5-19
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