Cutler-Hammer Digitrip 3000 Programming manual

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Effective 03/97
Cutler-Hammer
Instructions for Installation, Operation and Maintenance
of the Cutler-Hammer Digitrip 3000 Protective Relay

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Effective 03/97
TABLE OF CONTENTS
PAGE
SECTION 1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1 Preliminary Comments and Safety Precautions..................................................................................................1
1-1.1 Warranty and Liability Information..........................................................................................................1
1-1.2 Safety Precautions.................................................................................................................................1
1-2 General Information.............................................................................................................................................1
1-3 Functions/Features/Options................................................................................................................................2
1-4 Standards............................................................................................................................................................5
SECTION 2 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2-1 Protection, Testing and Communication Capabilities..........................................................................................6
2-1.1 RMS Sensing .........................................................................................................................................6
2-1.2 Pickup Setting ........................................................................................................................................6
2-1.3 Time Setting ...........................................................................................................................................6
2-1.4 Protection Curve Settings.......................................................................................................................6
2-1.5 Integral Testing.....................................................................................................................................10
2-1.6 Communications...................................................................................................................................10
2-2 Protective Relay Hardware................................................................................................................................11
2-2.1 Front Operations Panel........................................................................................................................11
2-2.2 Rear Access Panel...............................................................................................................................14
2-2.3 External Hardware................................................................................................................................16
2-3 UL Testing and Specification Summary............................................................................................................16
SECTION 3 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3-1 Introduction........................................................................................................................................................18
3-2 Power-Up and Self Testing ...............................................................................................................................18
3-3 Panel Operations...............................................................................................................................................18
3-3.1 Characteristic Curve.............................................................................................................................18
3-3.2 Program Mode......................................................................................................................................24
3-3.3 Programming Overview........................................................................................................................26
3-3.4 Test Mode ............................................................................................................................................27
3-4 Communications Function.................................................................................................................................27
SECTION 4 APPLICATION CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4-1 Zone Interlocking Capabilities...........................................................................................................................31
SECTION 5 INSTALLATION, STARTUP AND TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5-1 Introduction........................................................................................................................................................34
5-2 Panel Preparation..............................................................................................................................................34
5-2.1 Cutout...................................................................................................................................................34
5-2.2 Mounting...............................................................................................................................................34

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5-3 Replacing Digitrip MV with Digitrip 3000...........................................................................................................34
5-4 Wiring................................................................................................................................................................35
5-5 Initial Startup .....................................................................................................................................................35
5-5.1 Before Power Application.....................................................................................................................35
5-5.2 Initial Power Application.......................................................................................................................36
5-6 Miscellaneous Testing.......................................................................................................................................36
SECTION 6 MAINTENANCE AND STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6-1 General .............................................................................................................................................................37
6-1.1 Storage.................................................................................................................................................37
6-2 Troubleshooting Guide (Table 6-1) ...................................................................................................................37
6-3 Replacement.....................................................................................................................................................37
SECTION 7 TIME CURRENT CURVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7-1 Digitrip 3000 Inverse Time Overcurrent Curves................................................................................................40
7-2 Digitrip 3000 Curve Equations...........................................................................................................................60

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FIGURES
Figure Title Page
1-1 Digitrip 3000 Protective Relay (Front View)...............................................................................................1
1-2 Digitrip 3000 Protective Relay (Rear and Side Views) ..............................................................................2
1-3 A Digitrip 3000 Protective Relay Installed on a Metal Assembly Panel with a DP-4000 ...........................3
1-4 Digitrip 3000 Protective Relay with DIP Switches Shown in Upper Left (Rear View)................................3
1-5 Digitrip 3000 Curve Shape Possibilities.....................................................................................................4
1-6 Installed Jumpers in Place on Terminal Block TB-1 Disabling the
Zone Interlocking Feature..........................................................................................................................5
2-1 Typical Communications Wiring Diagram................................................................................................12
3-1 Digitrip 3000 Typical Wiring Diagram ......................................................................................................19
3-2 Digitrip 3000 Time-Current Characteristic Curves...................................................................................20
3-3 Sample Electronic Curves .......................................................................................................................21
3-4 Typical Inverse Time Overcurrent Pickup Horizontal Movement.............................................................21
3-5 Typical Time Multiplier Adjustment (I2T Response).................................................................................22
3-6 Short Delay Setting Adjustment...............................................................................................................22
3-7 Short Delay Time Adjustment..................................................................................................................22
3-8 Typical is Curve with I2T Slope................................................................................................................23
3-9 Instantaneous Setting Adjustment...........................................................................................................23
3-10 Programming Sequence Preview............................................................................................................26
3-11 Local Programming Sequence Flow Chart..............................................................................................28
4-1 Connection Diagram for Typical Phase Zone Selective Interlocking.......................................................32
4-2 Connection Diagram for Typical Ground Zone Selective Interlocking.....................................................33
5-1 Cutout Dimensions (Inches) ....................................................................................................................34
5-2 Digitrip 3000 Protective Relay Dimensions (Inches)................................................................................35
7-1 Inverse Time Overcurrent Phase, I4T Curves (SC-5390-92B) ................................................................41
7-2 Inverse Time Overcurrent Phase, I2T Curves (SC-5391-92B) ................................................................42
7-3 Inverse Time Overcurrent Phase, IT Curves (SC-5392-92B)..................................................................43
7-4 Inverse Time Overcurrent Phase, Flat Curves (SC-5393-92B)...............................................................44
7-5 Short Delay Phase Curves (SC-5394-92B).............................................................................................45
7-6 Inverse Time Overcurrent/Short Delay Curves (SC-5395-92B)...............................................................46
7-7 Instantaneous Curves (SC-5396-92B).....................................................................................................47
7-8 Inverse Time Overcurrent Ground, I4T Curves (SC-5399-92B)...............................................................48
7-9 Inverse Time Overcurrent Ground, I2T Curves (SC-5400-92B)...............................................................49
7-10 Inverse Time Overcurrent Ground, IT Curves (SC-5401-92B)................................................................50
7-11 Inverse Time Overcurrent Ground, Flat Curves (SC-5402-92B) .............................................................51
7-12 Short Delay Ground Curves (SC-5403-92B) ...........................................................................................52
7-13 ANSI Moderately Inverse Curves (SC-6685-96)......................................................................................53
7-14 ANSI Very Inverse Curves (SC-6686-96)................................................................................................54
7-15 ANSI Extremely Inverse Curves (SC-6687-96) .......................................................................................55
7-16 IEC-A Moderately Inverse Curves (SC-6688-96) ....................................................................................56
7-17 IEC-B Very Inverse Curves (SC-6689-96)...............................................................................................57
7-18 IEC-C Extremely Inverse Curves (SC-6690-96)......................................................................................58
7-19 IEC-D Flat Curves (SC-6691-96).............................................................................................................59

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TABLES
Table Title Page
2.1 Curve Selection .........................................................................................................................................6
2.2 Characteristic for Phase Element..............................................................................................................7
2.3 Characteristic for Ground Element ............................................................................................................8
2.4 Miscellaneous Settings..............................................................................................................................9
2.5 Factory Set Defaults................................................................................................................................10
3.1 Digitrip 3000 Curve Shapes.....................................................................................................................18
3.2 Digitrip 3000 Display Messages ..............................................................................................................30
5.1 Digitrip 3000 Dip Switch Settings.............................................................................................................36
6.1 Troubleshooting Guide ............................................................................................................................38

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SECTION 1: INTRODUCTION
1-1 PRELIMINARY COMMENTS AND SAFETY PRE-
CAUTIONS
This technical document is intended to cover most
aspects associated with the installation, application,
operation and maintenance of the Cutler-Hammer
Digitrip 3000 Protective Relay. This document is provid-
ed as a guide for authorized and qualified personnel
only in the selection and application of the Digitrip 3000
Protective Relay. Please refer to the specific WARNING
and CAUTION in Section 1-1.2 before proceeding. If fur-
ther information is required by the purchaser regarding a
particular installation, application or maintenance activi-
ty, a Cutler-Hammer representative should be contact-
ed.
1-1.1 WARRANTY AND LIABILITY INFORMATION
NO WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING WARRANTIES OF FITNESS FOR A PAR-
TICULAR PURPOSE OF MERCHANTABILITY, OR
WARRANTIES ARISING FROM COURSE OF DEAL-
ING OR USAGE OF TRADE, ARE MADE REGARDING
THE INFORMATION, RECOMMENDATIONS AND
DESCRIPTIONS CONTAINED HEREIN. In no event will
Cutler-Hammer be responsible to the purchaser or user
in contract, in tort (including negligence), strict liability or
otherwise for any special, indirect, incidental or conse-
quential damage or loss whatsoever, including but not
limited to damage or loss of use of equipment, plant or
power system, cost of capital, loss of power, additional
expenses in the use of existing power facilities, or
claims against the purchaser or user by its customers
resulting from the use of the information and descrip-
tions contained herein.
1-1.2 SAFETY PRECAUTIONS
All safety codes, safety standards and/or regulations
must be strictly observed in the installation, operation
and maintenance of this device.
THE WARNINGS AND CAUTIONS INCLUDED AS
PART OF THE PROCEDURAL STEPS IN THIS DOCU-
MENT ARE FOR PERSONNEL SAFETY AND PRO-
TECTION OF EQUIPMENT FROM DAMAGE. AN
EXAMPLE OF A TYPICAL WARNING LABEL HEAD-
ING IS SHOWN ABOVE TO FAMILIARIZE PERSON-
NEL WITH THE STYLE OF PRESENTATION. THIS
WILL HELP TO INSURE THAT PERSONNEL ARE
ALERT TO WARNINGS, WHICH MAY APPEAR
THROUGHOUT THE DOCUMENT. IN ADDITION,
CAUTIONS ARE ALL UPPER CASE AND BOLDFACE.
COMPLETELY READ AND UNDERSTAND THE
MATERIAL PRESENTED IN THIS DOCUMENT
BEFORE ATTEMPTING INSTALLATION, OPERATION
OR APPLICATION OF THE EQUIPMENT. IN ADDI-
TION, ONLY QUALIFIED PERSONS SHOULD BE
PERMITTED TO PERFORM ANY WORK ASSOCIAT-
ED WITH THE EQUIPMENT. ANY WIRING INSTRUC-
TIONS PRESENTED IN THIS DOCUMENT MUST BE
FOLLOWED PRECISELY. FAILURE TO DO SO
COULD CAUSE PERMANENT EQUIPMENT DAMAGE.
1-2 GENERAL INFORMATION
The Digitrip 3000 Protective Relay is a panel mounted
multi-function, microprocessor based overcurrent relay,
designed for both ANSI and IEC applications (Figures 1-
1and 1-2). It is a self-contained device which operates
!
CAUTION
!
WARNING
Figure 1-1 Digitrip 3000 Protective Relay (Front View)

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from either AC or DC control power, and provides true
RMS sensing of each phase and ground current. Only
one relay is required per three-phase circuit. Current
monitoring and operator selectable protective functions
are integral to each device.
THE LOSS OF CONTROL VOLTAGE WILL CAUSE
THE DIGITRIP 3000 TO BE INOPERATIVE. IF AC
CONTROL VOLTAGE IS USED, AN APPROPRIATE
RELIABLE POWER SOURCE/SCHEME SHOULD BE
SELECTED (POSSIBLY A UPS SYSTEM) TO SUPPLY
POWER TO THE RELAY.
The Digitrip 3000 Protective Relay provides protection
for most types of medium voltage electrical power distri-
bution systems. It was designed for use with Cutler-
Hammer Type VCP-W vacuum circuit breakers, as well
as other manufacturers’ medium and high voltage circuit
breakers (Figure 1-3). Digitrip 3000 Protective Relays
are compatible for use with all circuit breakers utilizing a
shunt trip coil. Thermal curves, plus ANSI and IEC
inverse time overcurrent curves provide close coordina-
tion with both downstream and upstream protective
devices. One Digitrip 3000 Protective Relay replaces
the normal complement of three or four conventional
electro-mechanical overcurrent relays, an ammeter, a
demand ammeter, an ammeter switch, and, in some sit-
uations, a lockout relay switch (device 86). All Digitrip
3000 Protective Relays include a built-in INCOM com-
munication capability compatible with the Cutler-
Hammer IMPACC system.
1-3 FUNCTIONS/FEATURES/OPTIONS
The primary function of the Digitrip 3000 Protective
Relay is overcurrent protection. This is achieved by ana-
lyzing the secondary current signals received from the
switch-gear current transformers. When predetermined
current levels and time delay settings are exceeded, the
closing of trip contact(s) is used to initiate breaker trip-
ping.
The Digitrip 3000 Protective Relay operates from the
secondary output of standard switchgear current trans-
formers rated at In= 5 amperes. It is operator configured
Figure 1-2 Digitrip 3000 Protective Relay (Rear and Side Views)
!
CAUTION

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Figure 1-3 A Digitrip 3000 Protective Relay (right)
Installed on a Metal Assembly Panel with a DP-4000 (left) Figure 1-4 Digitrip 3000 Protective Relay with DIP Switches Shown in Upper Left (Rear View)
to fit specific distribution system requirements. The cur-
rent transformer ratio information is programmed into
Digitrip 3000 by setting pushbuttons located on the face-
plate of the relay. The phase and ground CT ratios can
be independently programmed over a range of 5:5 to
5000:5. Refer to Table 2.4 for all available CT ratio set-
tings.
Protective functions are also configured by using the
pushbuttons on the faceplate of the relay. These protec-
tive functions can be programmed with the circuit break-
er in the open or closed position. DIP Switch S2, located
on the rear of the relay, is used to control closed breaker
setting ability (Figure 1-4). Refer to paragraph 2-2.2 and
Table 5.1 for additional information. Inverse time over-
current protection for the phase element cannot be dis-
abled. This insures that all phase protection cannot be
disabled. The relay also automatically exits the program
mode, if there is no programming activity for 2-1/2 min-
utes. Programming and test mode security is provided by
a sealable, hinged access cover on the front of the relay.
Direct reading displays indicate the value currently being
considered, while multi-colored LEDs indicate opera-
tional conditions and specific functions (Figure 1-1).
In addition to performing a continuous self-testing of
internal circuitry as a part of normal operation, all
Digitrip 3000 Protective Relays include a front accessi-
ble, integral field testing capability. In the integral test
mode, a test current simulates an overload or short cir-
cuit condition, to check that all tripping features are
functioning properly. The test function is user selectable
to trip or not trip the breaker. Refer to Paragraph 2-1.5
for additional information.
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

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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
discriminator can be disabled.
Digitrip 3000 Protective Relays provide greater selective
coordination potential by providing 11 different curve
shapes (Figure 1-5).
• Thermal Curves (4 shapes )
- It
- I2t
- I4t
- Flat
• ANSI Curves (3 shapes per ANSI C37.112)
- Moderately Inverse
- Very Inverse
- Extremely Inverse
• IEC 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 purpos-
es (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
disabled by the use of the two jumpers on the rear
mounted terminal strip TB1(Figure 1-6).
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 information can be transmitted to a remote location
via the built-in INCOM communication system. This type
of information is referred to as “COMMUNICATED
INFORMATION.” In addition to being able to provide a
circuit breaker “OPEN” or “CLOSED” status to the
remote location, the Digitrip 3000 displays and remotely
transmits parameters, such as:
Figure 1-5 Digitrip 3000 Curve Shape Possibilities
TIME
CURRENT
I4t
I2t
It
FLAT
(Curve Shape)
(Short Delay)
(Instantaneous)
TIME
CURRENT
(Curve Shape)
(Short Delay)
(Instantaneous)
XTRM
VERY
MOD
TIME
CURRENT
IEC-C IEC-B
IEC-A
(Curve Shape)
(Short Delay)
(Instantaneous)
IEC-D
Thermal Curves ANSI Curves➀IEC Curves➁
➀
ANSI Curve shapes defined by ANSI C37.112.
➁ IEC Curve shapes defined by IEC 255-3.

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• Individual phase currents
• Ground current
• Maximum current for each phase and ground since
last reset (Amp. Demand)
• Magnitude and phase of current causing trip
• Cause of trip
• Current transformer ratio
• Existing setpoint settings
The remote communications capability is made possible
by the Cutler-Hammer Integrated Communications
(INCOM) Chip and Protocol compatible with the
IMPACC Monitor and Control System. The protocol per-
mits a remote master computer to perform:
(1) Interrogation of relay data
(2) Execution of circuit breaker
“Close” and“Trip” commands
(3) “Reset” of the relay after a trip
(4) Downloading of settings
Reliable two-way communications can be provided over
a twisted pair communications network. The Digitrip
3000 Protective Relay is supplied with a built-in commu-
nications capability compatible with the Cutler-Hammer
IMPACC system.
1-4 STANDARDS
Digitrip 3000 Protective Relays are “Component
Recognized” by the Underwriters Laboratory, Inc.®
under UL File E154862. Refer to Section 2-3 UL Testing
and Specification Summary for more information.
Figure 1-6 Installed Jumpers in Place on Terminal
Block TB-1 Disabling the Zone Interlocking Feature