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DT3000
Instruction Leaflet
I.B. 17555D
Effective: Date 07/02
Page 3
For more information visit:
www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
1-1.1 WARRANTY AND LIABILITY INFORMATION
NO WARRANTIES, EXPRESSED OR IMPLIED,
INCLUDING WARRANTIES OF FITNESS FOR A
PARTICULAR PURPOSE OF MERCHANTABILITY, OR
WARRANTIES ARISING FROM COURSE OF DEALING 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 consequential 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 descriptions 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
DOCUMENTARE ARE FOR PERSONNEL SAFETY
AND PROTECTION OF EQUIPMENT FROM
DAMAGE. THIS IS AN EXAMPLE OF A TYPICAL
WARNING LABEL. THIS WILL HELP TO ENSURE
THAT PERSONNEL ARE ALERTED TO CAUTIONS
THAT APPEAR THROUGHOUT THE DOCUMENT.
COMPLETELY READ AND UNDERSTAND THE
MATERIAL PRESENTED IN THIS DOCUMENT
BEFORE ATTEMPTING INSTALLATION,
OPERATION OR APPLICATION OF THE
EQUIPMENT. ONLY QUALIFIED PERSONS
SHOULD BE PERMITTED TO PERFORM ANY
WORK ASSOCIATED WITH THE EQUIPMENT. ANY
WIRING INSTRUCTIONS PRESENTED IN THIS
DOCUMENT MUST BE FOLLOWED PRECISELY.
FAILURE TO DO SO COULD CAUSE PERMANENT
EQUIPMENT DAMAGE, BODILY INJURY OR
DEATH.
1-2 GENERAL INFORMATION
The Digitrip 3000 Protective Relay is a panel mounted
multifunction, microprocessor based overcurrent relay,
designed for both ANSI and IEC applications (Figures 1-1
and 1-2). It is a self-contained device that operates from
either ac or dc control power (the DT3030 & DT3031 operate
from dc power only) and provides true rms sensing of each
phase and ground current. Only one relay is required per
three-phase circuit. An integral part of each device is the
current
monitoring and the ability to select protective
functions.
Fig. 1-1 Digitrip 3000 Protective Relay (Front View)
THE LOSS OF CONTROL VOLTAGE WILL CAUSE
THE DIGITRIP 3000 TO BE INOPERABLE. IF AC
CONTROL VOLTAGE IS USED, IF AC CONTROL
VOLTAGE IS USED AN APPROPRIATE RELIABLE
POWER SOURCE/SCHEME SHOULD BE
SELECTED (POSSIBLY AN UPS SYSTEM) TO
SUPPLY POWER TO THE RELAY.
The Digitrip 3000 Protective Relay provides protection for
most types of medium voltage electrical power distribution
systems. It was designed for use with Cutler-Hammer Type
VCP-W vacuum circuit breakers, as well as other medium
and high voltage circuit breakers. 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 coordination with both downstream and
upstream protective devices. One Digitrip 3000 Protective
Relay replaces the following conventional electromechanical
overcurrent relays: 1) an ammeter, 2) a demand ammeter, 3)
an ammeter switch, 4) in some situations, a lockout relay
switch (device 86).
All Digitrip 3000 Protective Relays include a built-in INCOM
communication capability that is compatible with the Cutler-
Hammer PowerNet and IMPACC Systems.
WARNING