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I.B. 17555C
Effective November 1999
Page 4
The Digitrip 3000 Protective Relay provides five protec-
tive functions for both phase and ground protection. The
ground element is capable of a residual, an external
source ground or a zero sequence connection. If ground
protection is not desired, the ground element does not
have to be connected.
The five protective settings are:
• Inverse Time Overcurrent Pickup
• Inverse Time Overcurrent Time Multiplier
• Short Delay Pickup
• Short Delay Time
• Instantaneous Pickup
Each of the protective functions are independently pro-
grammed for various combinations to fit specific system
requirements. For protective functions not required, the
relay will allow all of the protective functions on ground
and all but the inverse time overcurrent function on phase
to be disabled. When the Digitrip 3000 is not set for an
instantaneous trip function, a true making current release
(discriminator) is available. If not desired, the discrimina-
tor can be disabled.
Fig. 1-3
Digitrip 3000 Protective Relay with DIP
Switches Shown in Upper Left (Rear View)
Digitrip 3000 Protective Relays provide greater selective
coordination potential by providing 11 different curve
shapes (Figure 1-4).
• Thermal Curves (4 shapes)
- It
- I
2
t
- I
4
t
- Flat
• ANSI Curves (3 shapes per ANSI C37.112)
- Moderately Inverse
- Very Inverse
- Extremely Inverse
• lEC Curves (4 shapes per IEC 255-3)
- IEC-A (Moderately Inverse)
- IEC-B (Very Inverse)
- IEC-C (Extremely Inverse)
- IEC-D (Definite Time)
The ground element of Digitrip 3000 can have a curve
shape independent of the phase element, providing for a
more versatile ground protection.
With this vast selection of Curve Shapes, Digitrip 3000
provides protection capable of coordinating with most any
existing electro-mechanical overcurrent relay or power
fuse.
A pictorial representation of characteristic curve shapes
is provided on the face of the relay for reference pur-
poses (Figure 1-1).
All Digitrip 3000 Protective Relays have zone selective
interlocking capabilities for phase and ground fault pro-
tection. Zone selective interlocking is a means by which
two or more coordinated trip devices can communicate to
alter their pre-set tripping modes to provide a faster
response for certain upstream fault conditions. The relay
is shipped with the zone selective interlocking feature dis-
abled by the use of the two jumpers on the rear mounted
terminal strip TB1 (Figure 1-5).
Digitrip 3000 Protective Relays operating parameters and
troubleshooting information are displayed on the front of
the relay, via the two display windows. This is considered
“ON DEVICE” information. In addition, all relay informa-
tion can be transmitted to a remote location via the built-
in INCOM communication system. This type of informa-
tion is referred to as “COMMUNICATED INFORMATION.”
Summary of Contents for Cutler-Hammer Digitrip 3000
Page 18: ...I B 17555C Effective November 1999 Page 12 Fig 2 1 Typical Communications Wiring Diagram...
Page 27: ...I B 17555C Effective November 1999 Page 21 Fig 3 1 Digitrip 3000 Typical Wiring Diagram...
Page 36: ...I B 17555C Effective November 1999 Page 30 Fig 3 11 Local Programming Sequence Flow Chart...
Page 37: ...I B 17555C Effective November 1999 Page 31...
Page 52: ...I B 17555C Effective November 1999 Page 46 Fig 7 5 Short Delay Phase Curves SC 5394 92B...
Page 54: ...I B 17555C Effective November 1999 Page 48 Fig 7 7 Instantaneous Curves SC 5396 92B...
Page 59: ...I B 17555C Effective November 1999 Page 53 Fig 7 12 Short Delay Ground Curves SC 5403 92B...
Page 60: ...I B 17555C Effective November 1999 Page 54 Fig 7 13 ANSI Moderately Inverse Curves SC 6685 96...
Page 61: ...I B 17555C Effective November 1999 Page 55 Fig 7 14 ANSI Very Inverse Curves SC 6686 96...
Page 62: ...I B 17555C Effective November 1999 Page 56 Fig 7 15 ANSI Extremely Inverse Curves SC 6687 96...
Page 63: ...I B 17555C Effective November 1999 Page 57 Fig 7 16 IEC A Moderately Inverse Curves SC 6688 96...
Page 64: ...I B 17555C Effective November 1999 Page 58 Fig 7 17 IEC B Very Inverse Curves SC 6689 96...
Page 65: ...I B 17555C Effective November 1999 Page 59 Fig 7 18 IEC C Extremely Inverse Curves SC 6690 96...
Page 66: ...I B 17555C Effective November 1999 Page 60 Fig 7 19 IEC D Flat Curves SC 6691 96...
Page 68: ...I B 17555C Effective November 1999 Page 62...
Page 73: ...I B 17555C Effective November 1999 Page A5 Fig A 7 DT3001 Typical Wiring Diagram...
Page 76: ...I B 17555C Effective November 1999 Page A8...
Page 81: ...I B 17555C Effective November 1999 Page B5 Fig B 2 Digitrip 3010 3020 Dimensions Inches...
Page 83: ...I B 17555C Effective November 1999 Page B7 Fig B 3 Digitrip 3010 3020 Typical Wiring Diagram...
Page 89: ...I B 17555C Effective November 1999 Page B13...
Page 90: ...I B 17555C Effective November 1999 Page B14...