GE LPS-O - T13: Zone 3 Phase Reach Test

5-
12
LPS-O Line Protection System GE Power Management
5.3 PHASE-TO-PHASE ZONE REACH TESTING 5 FUNCTIONAL TESTS (FACTORY SETTINGS)
5
6. Reduce I
op
of the faulted phase to zero. Note that the trip target indication concurs with the fault. For
example, an AB fault is displayed as follows:
TRIP AB Z2 "DIST"
where “DIST” is the displayed target.
7. Repeat the test for phase BC and CA faults.
5.3.3 T13 – ZONE 3 PHASE REACH TEST
1. Setting:
Z1DISTANCE
(101)
Z1PHASE
= NO
Z2DISTANCE
(201)
Z2PHASE
= NO
Z3DISTANCE
(301)
Z3PHASE
= YES
(304)
Z3P_TIME
= 2.0 sec.
Z4DISTANCE
(401)
Z4PHASE
= NO
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 16 (Any Zone 3 Phase). The LUI displays:
ANY Z3 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 5–4: FAULT CURRENT PHASE SET-
TINGS FOR T13. 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°)
Table 5–4: FAULT CURRENT PHASE SETTINGS FOR T13
I Degrees Volts rms
Displayed Target
†
–25 56 to 63 –
–55 65 to 73 195 to 205
–85 56 to 63 –
†
Reference only