GE LPS-O Instruction Manual page 164

6.4 BACKUP PROTECTION TESTS
6.4 BACKUP PROTECTION TESTS
1. Protection Settings:
Z1DISTANCE
(101) Z1PHASE = NO
Z2DISTANCE
(201) Z2PHASE = NO
Z3DISTANCE
(301) Z3PHASE = NO
Z4DISTANCE
(401) Z4PHASE = YES
Z4PHREACH = [________] Ω
(402)
(405) Z4_TIMERS = YES
(406) Z4P_TIME = 0.05 sec.
LINEINFO
(1204) TRSFMRTYPE = NONE
2. Record the following values:
V = [________] V
NOM 4
I = [________] A
T
∠ I
= [________]°
4
6
3. Connect the relay as shown in Figure 5–1: PHASE-TO-PHASE TEST CONNECTIONS on page 5–7 for
the appropriate phase under test. Set the relay to test mode 17 (Any Zone 4 Phase). The LUI displays:
ANY Z4 PHASE ON
4. Set the voltage inputs to the following values:
VA: 67 volts rms ∠0°,
VB: 67 volts rms ∠–120°,
VC: 67 volts rms ∠+120°.
5. Set the fault current, I
180° out of phase with the line to which it is shorted.
6. Set the fault current to I
and check that the A1 contact closes when the voltages are within 7% of V
7. Reduce the fault current to zero. Note that the trip target indication concurs with the fault. For example, an
AB fault is displayed as follows:
TRIP AB Z4 "DIST"
where "DIST" is the displayed target.
8. Repeat the test for phase BC and CA faults.
6-
14
, phase angle to ∠ I
= [________]° lagging. Note that the leading phase angle is
op 4
= [________] A rms. Simultaneously reduce the voltages of the faulted phases
T
LPS-O Line Protection System
6 FUNCTIONAL TESTS (USER SETTINGS)
6.4.1 T14 – ZONE 4 PHASE REACH TEST
.
NOM 4
GE Power Management