5-
6
LPS-D Line Protection System
GE Power Management
5.2 MEASURING UNIT TESTS
5 FUNCTIONAL TESTS (FACTORY SETTINGS)
5
5.2.8 T8 – GROUND TIME OVERCURRENT 51G
1.
Record the pre-test values for Protection Settings 610, 611, 612, 614, and 615.
2.
Settings:
OVERCURRNT
(610)
51G = YES
(611)
51G_DIRCNL = NO (direct ctrl off)
(612)
51GPICKUP = 1.0 (0.2) Amps
(614)
51GCURVE = V-INV
(615)
51GTIMDIAL = 5.0
3.
Connect the relay as shown in Figure 5–2: GROUND REACH TIMER TEST CONNECTIONS on page 5–8.
NOTE: Start the timer when
I
op
is applied, and stop the timer when A1 closes (the relay trips).
4.
For this test remove the relay from test mode and assign TOCTRP to A1.
(2007) A1 = index 119; TOCTRP
5.
Apply
I
op
at 3.0 (0.6) A rms and start the timer. Leave the current on until the A1 contact close and stop the
timer. The 51G should time out in 2.8 to 3.2 seconds.
6.
Reduce
I
op
to zero.
7.
Repeat steps 3 and 4 with the values for
I
op
from Table 5–1: TIME-OUT VALUES WHILE REPEATING T8
below. Verify that the 51G times out within the specified time.
8.
Restore these Protection settings
OVERCURRNT
(610)
51G =
Pretest setting
(611)
51G_DIRCNL =
Pretest setting
(612)
51GPICKUP =
Pretest setting
(615)
51GTIMDIAL=
Pretest setting
OUTPUTS
(2007) A1 =
Pretest
setting
Table 5–1: TIME-OUT VALUES WHILE REPEATING T8
I
op
, A rms
51G time out, s
3
2.8 to 3.2
6
0.9 to 1.1
10
0.6 to 0.8
Summary of Contents for LPS-D
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