GE LPS-O - T14: Zone 4 Phase Reach Test

GE Power Management LPS-O Line Protection System 5-
13
5 FUNCTIONAL TESTS (FACTORY SETTINGS) 5.3 PHASE-TO-PHASE ZONE REACH TESTING
5
5. Set the fault current to 5.0 (1.0) Amps rms. Simultaneously reduce the voltages of the faulted phases and
check that the A1 contact closes when the voltages are within the limits shown in Table 5–4: FAULT CUR-
RENT PHASE SETTINGS FOR T13.
6. Reduce the fault current to zero. Note that the trip target indication concurs with the fault. For example, an
AB fault is displayed as:
TRIP: AB Z3 "DIST"
where “DIST” is the displayed target.
7. Repeat the test for phase BC and CA faults.
5.3.4 T14 – ZONE 4 PHASE REACH
1. Setting:
Z1DISTANCE
(101)
Z1PHASE
= NO
Z2DISTANCE
(201)
Z2PHASE
= NO
Z3DISTANCE
(301)
Z3PHASE
= NO
Z4DISTANCE
(401)
Z4PHASE
= YES
(405)
Z4_TIMERS
= YES
(406)
Z4P_TIME
= 0.05 sec.
LINEINFO
(1204)
TRSFMRTYPE
= NONE
2. 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
3. Set the voltage inputs to the following values:
VA: 67 volts rms
∠
0°,
VB: 67 volts rms
∠
–120°,
VC: 67 volts rms
∠
+120°.
4. Set the fault current,
I
op
, to the phase-angle value listed in Table 5–5: FAULT CURRENT PHASE SET-
TINGS FOR TEST T14. Note that the leading phase angle is 180° out of phase with the line to which it is
shorted. (increase VA, VB, and VC to 75 V when
∠
I
op
= –55°)