GE LPS-O, Инструкция по эксплуатации

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GE Power Management LPS-O Line Protection System 6-
5
6 FUNCTIONAL TESTS (USER SETTINGS) 6.2 MEASURING UNIT TESTS
6
3. Set the relay into test mode 27 (Phase Overcurrent). The LUI should display
INST PHS OVRC ON
4. Set I
op
to 0.55 x 50PICKUP = [________] A rms and apply to the relay. The A1 contact should close.
Lower I
op
to 0.45 x 50PICKUP = [________] A rms, at which point the A1 contact should open.
5. Reduce I
op
to 0 A.
6.2.7 T7 – GROUND INSTANTANEOUS OVERCURRENT TEST
1. Protection settings:
OVERCURRNT
(605) 50G = YES
(606) 50G_DIRCNL = NO
(607) 50GPICKUP = [________] Amps
(610) 51G = NO
LINEPICKUP
(801) LINEPICKUP = NO
The 50G function is given by:
50G = 3 I
0
+ 0.9 I
1
(eq. 6–1)
where I
0
is the zero-sequence current and I
1
is the positive-sequence current. Since the test current I
op
is
single phase, I
0
and I
1
are given by:
Substituting Equations 6–2 and 6–3 into Equation 6–1 yields:
50G = I
op
– 0.3 I
op
= 0.7 I
op
(eq. 6–4)
Therefore, I
PT
will pick up when:
2. Connect the relay as shown in Figure 4–3: PHASE TO GROUND TEST CONNECTIONS on page 4–16.
3. Set the relay into test mode 28 (Ground Overcurrent). The LUI displays
INST GND OVRC ON
4. Set I
op
to (50GPICKUP / 0.7) + 0.5 = [________] A rms and apply to the relay. The A1 contact should
close. Lower I
op
to (50GPICKUP / 0.7) – 0.5 = [________] A rms, at which point the A1 contact should
open.
5. Reduce I
op
to 0 A.
I
0
I
op
3
------- = (eq. 6–2) and I
1
I
op
3
------- (eq. 6–3) =
I
PT
50GPICKUP
0.7
---------------------------------
≥