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6 FUNCTIONAL TESTS (USER SETTINGS)
3. Set the relay into test mode 27 (Phase Overcurrent). The LUI should display
INST PHS OVRC ON
4. Set I
to 0.55 x 50PICKUP = [________] A rms and apply to the relay. The A1 contact should close.
op
Lower I
to 0.45 x 50PICKUP = [________] A rms, at which point the A1 contact should open.
op
5. Reduce I
to 0 A.
op
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
+ 0.9 I
0
1
where I
is the zero-sequence current and I
0
single phase, I
and I
0
1
I
op
I
=
------ -
(eq. 6–2)
0
3
Substituting Equations 6–2 and 6–3 into Equation 6–1 yields:
50G = I
– 0.3 I
op
op
Therefore, I
will pick up when:
PT
50GPICKUP
≥
I
-------------------------------- -
PT
0.7
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
to (50GPICKUP / 0.7) + 0.5 = [________] A rms and apply to the relay. The A1 contact should
op
close. Lower I
to (50GPICKUP / 0.7) – 0.5 = [________] A rms, at which point the A1 contact should
op
open.
5. Reduce I
to 0 A.
op
GE Power Management
6.2.7 T7 – GROUND INSTANTANEOUS OVERCURRENT TEST
(eq. 6–1)
is the positive-sequence current. Since the test current I
1
are given by:
I
op
I
and
=
------ - (eq. 6–3)
1
3
= 0.7 I
(eq. 6–4)
op
LPS-O Line Protection System
6.2 MEASURING UNIT TESTS
is
op
6
6-
5
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