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I.L. 41-496.52D
Phase A
Use test connection No. 5. Pickup Current I
be .190 -.218 amps, current lagging voltage V
75°.
Phase B
Use test connection No. 6. Set V
V
= 70 volts. Pickup current I
CN
.218 amps, current lagging voltage V
Phase C
Use test connection No. 7. Set V
V
= 70 volts. Pickup current I
CN
.218 amps, current lagging voltage V
Remove jumper from overcurrent unit and return all
"S" connections to S = 1.
7.2.
.2 – 4.25 Ohm Relay
7.2.1. SDG-1T, SDG-2T, SDG-4T Relays
Using previous relay tap settings, apply rated dc volt-
age and proceed as follows.
Part A: 2.5 VOLT TEST
Phase A
Use test connection No. 5. Set V
V
= 70 volts. Disable overcurrent unit by jumping
CN
terminals 1 & 17 on magnitude comparator module.
Adjust R18 for proper pickup level. Pickup current I
should be 1.00 - 1.10 amps, current lagging voltage
V
by 75˚.
AN
Phase B
Use test connection No. 6. Set V
V
= 70 volts. Pickup current I
BN
1.10 amps, current lagging voltage 75°.
Phase C
Use test connection No. 7. Set V
V
= 70 volts. Pickup current should be 1.00 - 1.10
BN
amps, current lagging voltage V
jumper from overcurrent unit and return all "S" con-
nections to S = 1.
If limits above are not met, see special note under
"Impedance Test."
22
should
A
by
AN
= 10 volts. V
=
BN
AN
should be .190 -
B
by 75˚.
BN
= 10 volts. V
=
CN
AN
should be .190 -
C
by 75˚.
CN
- 2.5 volts. V
=
AN
BN
A
= 2.5 volts, V
=
BN
AN
should be 1.00 -
B
= 2.5 volts, V
=
CN
AN
by 75°. Remove
CN
Part B: 20 VOLT TEST
Phase A
Use test connection No. 5. Set V
V
= 70 volts. Set phase-shifter for 75° current lag-
CN
ging voltage. Pickup current I
amps, current lagging V
Phase B
Set V
= 20 volts, V
BN
AN
connection No. 6. Pickup current I
8.55 amp, current lagging V
Phase C
Set V
= 20 volts, V
CN
AN
connection No. 6. Pickup current I
8.55 amps, current lagging V
Part C: S = 3 TEST
Set S
= S
= S
= 3. Set V
A
B
C
= 70 volts.
Phase A
Use test connection No. 5. Pickup current I
be 1.35 - 1.43 amps, current lagging voltage V
75˚.
Phase B
Use test connection No. 6. Set V
V
= 70 volts. Pickup current I
CN
1.43 amps, current lagging voltage V
Phase C
Use test connection No. 7. Set V
V
= 70 volts. Pickup current I
CN
1.43 amps, current lagging voltage V
Remove jumper from overcurrent unit and return all
"S" connections to S = 1.
7.3. push-button Test
Use test connection No. 1. No current is required.
Apply dc to the relay. Open circuit voltage connection
to relay terminal No. 7. Set V
Depress white push-button and it should light.
7.3.1. Indicating Contactor Switch
With the relay tripped, pass sufficient dc current
through the trip circuit to close the contacts of ICS.
This value of current should be not less than 1.0
= 20 volts. V
AN
should be 8.05 - 8.55
A
voltage by 75°.
AN
= V
= 70 volts. Use test
CN
should be 8.05 -
B
voltage by 75°.
BN
= V
= 70 volts. Use test
BN
should be 8.05 -
C
voltage by 75°.
CN
= 10 volts. V
AN
BN
should
A
= 10 volts, V
BN
should be 1.35 -
B
by 75˚.
BN
= 10 volts, V
CN
should be 1.35 -
C
by 75˚.
CN
= V
= 70 volts.
BN
CN
=
BN
= V
CN
by
AN
=
AN
=
AN
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