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4.
Reclosing Initiation (RI) contacts RI-1 and RI-2 will not operate since the setting "RI type"
is "No RI". Change "RI Type" to "ØG RI" and re-apply the fault current. RI-1 and RI-2 should
pick-up for approximately 400 ms (after the trip decision has been made).
Repeat the A phase-to-ground fault test and measure the trip time, which should be
less than 2 cycles.
STEP 7
Using the test connections shown in Figures 5-5 and 5-6, repeat Step 6 above for B
phase-to-ground (BG) and C phase-to-ground (CG) faults respectively. The test voltag-
es are shown below:
For BG fault test, make connections as shown in Figure 5-5 and adjust the voltages as
follows:
Apply current to the B phase current input as shown. The current required to trip is
4.00 amps ± 5% at an angle of 75° lagging the fault voltage.
When the relay trips, remove the fault current. Zone1 and BG LED's will light. The LCD
display will indicate the fault distance. Using the RAISE and LOWER push-buttons the
complete fault record can be reviewed. See Table 4-3 for a description of the displayed
fault data quantities.
The significant quantities to review are:
For CG fault test make connections as shown in Figure 5-6 and adjust the voltages as
follows:
Apply current to the C phase current input as shown. The current required to trip is
4.00 Amps ± 5% at the angle of 75° lagging the fault voltage.
When the relay trips, remove the fault current. Zone1 and CG LED's will light. The LCD
display will indicate the fault distance. Using the RAISE and LOER push-buttons the
complete fault record can be reviewed. See Table 4-4 for a description of the displayed
fault data quantities.
The significant quantities to review are:
(10/94)
V
= 70 ang 0°
A
V
= V
= 30 ang -120°
B
F
V
= 70 ang 120°
C
Fault Type – "FLT Type" "BG"
Targets – "Zone1G" "Yes"
Fault Voltages (VA, VB, VC, 3V0) and Currents (IA, IB, IC, IP)
V
= 70 ang 0°
A
V
= 70 ang -120°
B
V
= V
= 30 ang 120°
C
F
I.L. 40-386.3
5-9
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