I.L. 40-385.5
A-10
Step 16. This completes the basic Acceptance
Test for the MDAR Pilot System. (See subse-
quent segments for optional Single Pole Trip
test.)
1.3
SINGLE POLE TRIP (OPTION)
ACCEPTANCE TESTS
Step 1.
Set relay per Table A-1. 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
Reclose (RI) Trip and Breaker Failure
(BFI) Contacts
Step 2.
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 A-3 (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.
1.3.2
62T Trip
Step 3.
XTRIPA, XTRIPB and XTRIPC Termi-
nals. MDAR’s 52a [TB5/1(+) & TB5/2(-)] is used
as XTRIPA input, SBP [TB5/13(+) & TB5/14(-)] is
used as XTRIPB and RCVR2 [TB5/11(+) & TB5/
12(-)] is used as XTRIPC.
(a) Set IM = 5 and SPTT = 6. Apply a rated dc volt-
age to XTRIPA terminals. Apply an AG fault with
Ia = 4.5 amps and Va = 30 volts as shown in Ap-
pendix Section 1.1.3, step 10. The relay should
trip in 5 seconds with a display of 62T.
(b) Repeat (a) but for XTRIPB terminals and BG
fault.
(c) Repeat (a) but for XTRIPC terminals and CG
fault.
1.3.3
SPTT Timer Test
Step 4.
Set SPTT = 4. Repeat the test of step 3 (a)
with voltage applied to XTRIPA. The relay should
trip with a target of Z1G-AG in 4 seconds. Reset
SPTT = 1.
1.4
MDAR WITH OUT-OF-STEP BLOCK
OPTION
Refer to Figure A-5. The RT setting (21BI) is for the
inner blinder. The RU setting (21BO) is for the outer
blinder. If the setting of OSB1 (for Z1P) or OSB2 (for
Z2P) or OSBP (for PLTP) 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 for Zone-1 or Zone-2 or Pilot fault, respec-
tively, until the timer (OSTM) times out.
Connect the test circuit as shown in Figure A-2.
1.4.1
Condition OSB1 = OSB2 = OSBP = NO
Step 1.
Set the relay per Table A-1, except for the
following settings:
Z1P = 10
Z1G = 10
T2P = 0.8
Z2P = 20
T2G = 0.8
Z2G = 20
IM
= 1.5
(Check: PANG = GANG = 75; RT = RU = 15; OSTM
= 500)
Step 2.
Adjust the inputs as follows:
Step 3.
Apply current I
F
of 2.35A
±
5% suddenly.
The relay should trip with a display of Z2P = ABC.
Step 4.
Apply I
F
of 4.7A
±
5% suddenly. The relay
should trip with a display of Z1P = ABC.
NOTE: The trip current (I
F
) can be obtained from
the equation in test Step 12 (1.1.4 Zone 1
Test/Three-Phase), with the parameters:
V
a
40 0
°
∠
=
I
a
I
F
45
°
–
∠
=
V
b
40
120
°
–
∠
=
I
b
I
F
165
°
–
∠
=
V
c
40 120
°
∠
=
I
c
I
F
75
°
∠
=