GE LPS-O Instruction Manual page 134

5.1 MEASURING UNIT TESTS
1. Protection Settings:
OVERCURRNT
(610) 51G = YES
(611) 51G_DIRCNL = NO
(612) 51GPICKUP = 1.0 (0.2) Amps
(614) 51GCURVE = V-INV
(615) 51GTIMDIAL = 5.0 sec.
(617) 51G_RESET = FAST
2. Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–16.
NOTE: Start the timer when I
3. For this test remove the relay from test mode and assign TOCTRP to A1.
(1607) A1 = index 119; TOCTRP
4. Apply I at 3.0 (0.6) A rms (this is 3 times the multiple of pickup) and start the timer. Leave the current on
op
until the A1 contact closes and stops the timer. The 51G should time out in 2.8 to 3.2 seconds.
5
>
I
51GPICKUP
op
See Chapter 6 for I
5. Reduce I to zero.
op
6. Repeat steps 3 and 4 with the values for I
below. Verify that the 51G times out within the specified time.
Table 5–1: TIME-OUT VALUES WHILE REPEATING T8
I
, A rms
op
3
6
10
5-
6
is applied, and stop the timer when A1 closes (the relay trips).
op
description.
op
op
51G time out, s
2.8 to 3.2
0.9 to 1.1
0.6 to 0.8
LPS-O Line Protection System
5 FUNCTIONAL TESTS (FACTORY SETTINGS)
5.1.9 T8 – GROUND TIME OVERCURRENT TEST
from Table 5–1: TIME-OUT VALUES WHILE REPEATING T8
GE Power Management