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I.L. 40-385.1B
quent segments for optional Single Pole Trip
test.)
1.3
SINGLE POLE TRIP (OPTION)
ACCEPTANCE TESTS
Step 1.
Set relay for Non-Pilot (per Table 6-1), or
for Pilot Systems (per Table 6-3). Check the 62T
setting; it should be 5.000. For a Pilot System,
change the setting to PLT = YES, and apply a rat-
ed dc voltage to Pilot Enable terminals TB5/9(+)
and TB5/10(-). Also apply a rated voltage to
RCVR #1 terminals TB5/7(+) and TB5/8(-) if the
STYP = POTT or PUTT; set TTYP = SPR.
Apply AG fault as shown in this Appendix Section
1.1.3, Step 10. The Trip A contacts (2FT-14/1-2
and 3-4) should be closed. Repeat BG fault (for
Trip B contact closures) and repeat CG-Fault (for
Trip C contact closures).
1.3.1
Sound Phase Fault (SPF) and 62T Trip
Step 2.
Apply a rated dc voltage to 52a terminals
TB5/1(+) and TB5/2(-) and to 52b terminals TB5/
3(+) and TB5/4(-). Connect a Westinghouse
Lockout (WL) switch to the trip circuit.
Step 3.
Apply a phase-to-phase fault (as shown in
this Appendix, segment 1.1.5, Step 13). Turn the
fault current "ON" and "OFF". The WL switch trips
with a target of SPF.
Step 4.
Set the WL switch, immediately; it will trip
again with a target of 62T. Remove the voltages
from 52a and 52b.
1.3.2
Reclose (RI) Trip and Breaker Failure
(BFI) Contacts
Step 5.
Refer to the Non-Pilot Acceptance Test
for the single-phase-to-ground faults (Steps 10
and 11), and to the three-phase fault (Step 12).
The fault current should be 20% greater than the
calculated values for the tests in these steps. The
"fault types" applied to the MDAR relay are
shown in Table 6-4 (column 2). TTYP settings
are shown in column 1, whereas the results of RI,
Trip, and BFI contacts are shown in columns 3, 4,
and 5, respectively.
1.4
MDAR WITH OUT-OF-STEP BLOCK
OPTION
Refer to Figure 6-5. The RT setting (21BI) is for the
inner blinder and it is also used for three-phase fault
6-10
load restriction. The RU setting (21BO) is for the out-
er blinder. If the setting of OSB is "YES", and the
power swing stays inside the two parallel lines (RT
and RU) for more than 50 ms, the three-phase fault
trip will be blocked until the timer (OSOT) times out.
Connect the test circuit as shown in Figure 6-2.
1.4.1
Condition OSB = NO
Step 1.
Set the relay per Table 6-1, except for the
following settings:
Z1P = 10
Z1G = 10
T2P = 0.1
Z2P = 20
T2G = 0.1
Z2G = 20
(Check: PANG = GANG = 75; RT = RU = 15; OSOT
= 4000)
Step 2.
Adjust the inputs as follows:
∠
V
=
40 0°
a
∠
V
=
40
–
120°
b
∠
V
=
40 120°
c
Step 3.
Apply current I
The relay should trip with a display of Z2P = ABC.
of 4.7A ±5% suddenly. The relay
Step 4.
Apply I
F
should trip with a display of Z1P = ABC.
Step 5.
Change the RT setting from 15 to 4. Re-
peat Steps 3 and 4 (above). The relay should not
trip because the RT restricts the 3-phase fault
current.
NOTE: The trip current (IF) can be obtained
from the equation in test Step 12 (1.1.4
Zone 1 Test/Three-Phase), with the pa-
rameters:
VLN = 40
PANG = 75
Z1P = 10 (or Z2P = 20) X = 45
1.4.2
Condition OSB = YES
Change the OSB setting from NO to YES and RT =
4, RU = 8.
Step 1.
Change the LED to metering mode with
the display of OSB = NO.
Step 2.
Apply a current I
The display should show OSB = YES for 4
∠
I
=
I
–
45°
a
F
∠
I
=
I
–
165°
b
F
∠
I
=
I
75°
c
F
of 2.35A ±5% suddenly.
F
of 2.7A ± 5% suddenly.
F
(5/92)
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