DT3000 Instruction Leaflet
I.B. 17555D Effective: Date 07/02 Page 69
For more information visit: www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
APPENDIX B
B1.0 INTRODUCTION
This appendix describes the Dual-Source Power Supply
(DSPS) addition to the Digitrip 3000 Protective Relay.
Table B-1 lists the DSPS—equipped DT3000 versions.
Table B-1 Ordering Information
New
Style
Number
Old
Style
Number
Cat. No. Description
4D13125G21 4D13125G11 DT3010 DT3000 Protective
Relay, std. Firmware
120VAC/Ct Dual
Source Power Supply
4D13125G22 4D13125G12 DT3020 DT3000 Protective
Relay, std. Firmware
120VAC/Ct Dual
Source Power Supply
B2.0 GENERAL DESCRIPTION
The Digitrip 3000 with Dual-Source Power Supply (DSPS)
is a microprocessor-based feeder overcurrent protective
relay designed for ac auxiliary power applications. The
DSPS versions, DT3010 and DT3020, include an integral
power supply module which:
• Powers the relay from nominal 120 Vac, 50/60Hz
(DT3010 model) or 240 Vac, 50/60Hz (DT3020 model)
auxiliary power, which is normally connected and
available.
• Operates solely from the main current transformers
(Ct) during a fault if the normally connected auxiliary
ac voltage is not available, like an electromechanical
relay or an electronic “self-powered” relay.
The Ct powering capability is critical for tripping if the ac
auxiliary supply or its fuses fail prior to the fault; or if the
fault itself collapses the supply voltage at the critical
moment when tripping is needed.
The DT3000 with Dual-Source Power Supply design offers
significant performance and reliability benefits over the
electromechanical or “self-powered” relays. It provides a
full-time metering display, remote communications and
self-monitoring functions. In addition, there is no calibration
required. The burden is lower than most electromechanical
and solid state self-powered relays.
The DT3000 with DSPS provides long-term, robust,
maintenance-free performance, which can’t be achieved
with an energy-storing un-interruptible power supply (UPS).
The DSPS will operate anytime there is a fault even after
an extended power outage.
Fig. B-1 Digitrip 3000 with DSPS
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