Eaton DT3000 User Manual

I.B. 17555C
Effective November 1999
Page B1
Appendix B
Table of Contents Page
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . B1
2.0 General Description. . . . . . . . . . . . . . . . . . . . . . B1
3.0 Functional Description . . . . . . . . . . . . . . . . . . . . B4
4.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B4
5.0 Wiring and Setup . . . . . . . . . . . . . . . . . . . . . . . . B6
6.0 Application Considerations . . . . . . . . . . . . . . . . B6
7.0 Testing the Dual-Source Power Supply . . . . . . B11
8.0 Warranty and Liability . . . . . . . . . . . . . . . . . . . B13
9.0 Technical Assistance . . . . . . . . . . . . . . . . . . . . B13
1.0 INTRODUCTION
This appendix describes the Dual-Source Power Supply
(DSPS) addition to the Digitrip 3000 Protective Relay.
Table 1 lists the DSPS–equipped DT3000 versions.
2.0 GENERAL DESCRIPTION
The Digitrip 3000 with Dual-Source Power Supply
(DSPS) is a microprocessor-based feeder overcurrent
protective relay designed for ac auxiliary power applica-
tions. 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 avail-
able.
• Operates solely from the main current transformers
(cts) 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 pro-
vides a full-time metering display, remote communica-
tions, 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 uninterruptible power supply
(UPS). The DSPS will operate anytime there is a fault
even after an extended power outage.
CAUTION
TO BE EFFECTIVE, THE DIGITRIP 3000 WITH DSPS
MUST BE USED WITH A BREAKER HAVING CAPACI-
TOR TRIP OR OTHER STORED-ENERGY TRIP
MECHANISM THAT CAN OPERATE WHEN THE AC
SUPPLY HAS FAILED.
TABLE B-1 ORDERING INFORMATION
Description Cat. No. Style No.
Digitrip 3000 with 120Vac Dual-
Source Power Supply
DT3010 4D13125G11
Digitrip 3000 with 240Vac Dual-
Source Power Supply
DT3020 4D13125G12

Eaton DT3000 Specifications

General

Brand	Eaton
Model	DT3000
Category	Relays
Language	English