GE Power Management
LPS-D Line Protection System
5-
15
5 FUNCTIONAL TESTS (FACTORY SETTINGS)
5.3 ZONE REACH AND TIMER TESTS
5
5.3.6 T15 – GROUND (ZONE BACKUP) TIMER TESTS
1.
For this test, remove the relay from test mode. Record the pre-test values for all Protection Settings used
in the test.
2.
Protection settings:
LINEPICKUP
(901)
LINEPICKUP = NO
Z1DISTANCE
(101)
Z1PHASE = NO
(104)
Z1GROUND = NO
Z2DISTANCE
(201)
Z2PHASE = NO
(204)
Z2GROUND = YES
(209)
Z2P_TIME = 1.0
(210)
Z2G_TIME = 1.0
Z3DISTANCE
(301)
Z3PHASE = NO
(304)
Z3GRND = YES
(307)
Z3P_TIME = 3.0
(308)
Z3G_TIME = 3.0
Z4DISTANCE
(401)
Z4PHASE = NO
(405)
Z4GRND = YES
(410)
Z4P_TIME = 5.0
(411)
Z4G_TIME = 5.0
OUTPUTS
(2007) A1 = Z2GTMR; Index 129
a) ZONE 2 TIMER
3.
Connect the relay as shown in Figure 5–2: GROUND REACH TIMER TEST CONNECTIONS on page 5–8
for the appropriate phase under test.
4.
Set the voltage inputs to the following values:
VA: 55 volts rms
∠
0°,
VB: 67 volts rms
∠
–120°,
VC: 67 volts rms
∠
+120°.
5.
Set the phase angle of the fault current
I
op
to –55°.
6.
Apply the fault current at 8.2 (1.6) amps rms to the relay and start the Precision Timer (the fault current
should not be ramped, but should be applied at the required level). This is an AG fault that is within pickup
of all four zones.
7.
Stop the timer when the A1 contact closes, and reduce the fault current to zero. Verify that the trip target
indication shows a ZONE2 trip, such as: AG Z2. This verifies that the second zone tripped. The time for the
trip should be in the range 0.9 to 1.1 seconds.
8.
Leave the voltages at the values of step 4.
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