Application Considerations - Eaton Cutler-Hammer Digitrip 3000 Instructions For Installation, Operation And Maintenance

Page A6
5.0

APPLICATION CONSIDERATIONS

NOTE: The following material replaces Figure 4-1 and
4-2 on pages 32 and 33.
Zone selective interlocking is available on the Digitrip
3001 Protective Relays for the inverse time and short
time functions on the phase and ground elements. Refer
to Figure A-8 for a typical phase zone selection interlock-
ing wiring diagram or Figure A-9 for a typical ground zone
interlocking wiring diagram. The terminal numbering is
different from that of the standard DT3001 Protective
Relay.
DT3000
Typical Main
Digitrip 3000
Phase
Zone Com.
ZONE 1
DT3000
F1
Typical
Feeder
15
DT3000
16
18
ZONE 2
DT3000
B1
Typical
15
Downstream
Breaker
16
DT3000
18
ZONE 3
Fig. A-8 Typical Phase Zone Selective Interlocking
Connection Diagram
M
15
Out
16
In
18
DT3000
F2
DT3000 DT3000
B2 B3
15
16
18
Typical Main
Digitrip 3000
ZONE 1
Typical
Feeder
DT3000
ZONE 2
Typical
Downstream
Breaker
DT3000
ZONE 3
15
Fig. A-9 Typical Ground Zone Selective Interlocking
16
Connection Diagram
18
NOTES:
1. Maximum distance between first and last phase or
ground zone interconnection cable should be 250
feet. Route separate from power conductors.
15
2. Jumper on devices in last zone used to provide time
16
delay per inverse time overcurrent or short delay time
18
setting. If jumper is not used the Digitrip 3001 will ini-
tiate trip without time delay (nominally 0.1 seconds).
3. Up to 10 Digitrip devices may be wired in parallel to
provide a single upstream restraint signal.
4. Only one zone common used for both phase and
ground.
5. DO NOT CONNECT ZONE COMMON TO EARTH
GROUND.
DT3000
M
13
Out
Ground
14
In
15
16
18
Zone Com.
DT3000
F1
13
14
15
16
18
DT3000 DT3000
B1 B2
13 13
14 14
15 15
16 16
18 18
I.B. 17555C
DT3000
F2
13
14
15
16
18
DT3000
B3
13
14
15
16
18
Effective November 1999