User`s guide

Volume 3—Power Distribution and Control Assemblies CA08100004E—November 2013 www.eaton.com V3-T9-207
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9.4
Metering Devices, Protective Relays, Software and Connectivity
Protective Relays
DT-3000
Contents
Description Page
Product Selection Guide . . . . . . . . . . . . . . . . . . . . . V3-T9-158
FP-6000 Feeder Protection. . . . . . . . . . . . . . . . . . . V3-T9-162
FP-5000 Feeder Protection. . . . . . . . . . . . . . . . . . . V3-T9-172
FP-4000 Feeder Protection. . . . . . . . . . . . . . . . . . . V3-T9-180
MP-3000 Motor Protection. . . . . . . . . . . . . . . . . . . V3-T9-188
MP-4000 Motor Protection. . . . . . . . . . . . . . . . . . . V3-T9-198
MD-3000 Motor/Generator Differential Relay. . . . . V3-T9-204
Digitrip 3000
Features, Benefits and Functions . . . . . . . . . . . V3-T9-209
Standards and Certifications . . . . . . . . . . . . . . . V3-T9-209
Product Selection . . . . . . . . . . . . . . . . . . . . . . . V3-T9-210
Options and Accessories. . . . . . . . . . . . . . . . . . V3-T9-210
Technical Data and Specifications . . . . . . . . . . . V3-T9-211
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . V3-T9-214
VR-300 Multifunctional Voltage Relay . . . . . . . . . . V3-T9-217
DP-300 Current Differential Protection Relay . . . . . V3-T9-221
EDR-3000 Feeder Protection . . . . . . . . . . . . . . . . . V3-T9-226
ETR-4000 Transformer Protection Relay. . . . . . . . . V3-T9-237
Ground Fault Relay . . . . . . . . . . . . . . . . . . . . . . . . . V3-T9-250
Universal RTD Module . . . . . . . . . . . . . . . . . . . . . . V3-T9-254
IQ 125 Volt DC Power Supply . . . . . . . . . . . . . . . . . V3-T9-258
Digitrip 3000
Product Description
●
Microprocessor-based,
three-phase and ground
overcurrent relay
●
Independent phase and
ground measuring circuits
and operation
●
Inverse time (51), short
delay (50, 2) and
instantaneous (50)
protection
●
Eleven time overcurrent
characters including ANSI,
IEC and thermal protection
curves
●
Phase and ground
ampmeter and peak
demand functions
●
INCOM communication
port
●
Fixed mount or optional
quick release drawout
case design
●
Dual-source power supply
option for AC control
power applications
Application Description
Eaton’s Digitrip 3000
microprocessor-based relay
provides reliable three-phase
and ground overcurrent
protection for all voltage
levels. It can be used for
any application where
instantaneous and/or time
overcurrent protection
is required. It is most
commonly used as primary
feeder circuit protection,
see figure below.
Primary Feeder
Circuit Protection
The Digitrip 3000 may be
applied as the transformer
primary protection or as
backup to the differential
protection, see figure below.
Transformer Overcurrent
Protection
The Digitrip 3000 may be
connected to the secondary
side of a delta-wye grounded
transformer with the ground
element connected to a
separate CT in the neutral
connection of the
transformer. With this
connection, a lower CT ratio
and a pickup setting can
be used to provide more
sensitive ground fault
protection especially for
resistance grounded
systems, see figure below.
Transformer Secondary
Protection with Neutral
CT Connection
The Digitrip 3000 ground
overcurrent element can be
connected in the residual
circuit of the phase CTs as
shown in the top figure or
to a separate ground CT as
shown in last figure.
Residual Ground
Connection
Separate Zero Sequence
Ground CT Connection
50 51
50G 51G
CB
52
Digitrip
3000
Load
50 51
50G 51G
CB
Digitrip
3000
5
0
G
5
1
G
5
0
5
1
Di
g
itrip
3
000
R
esist
or
C
B
a
b
c
GND
Digitrip
3000
CB-52
A1 A2
B1 B2
C1 C2
G1 G2
50N/51N
CB-52
a
b
c
GND
Digitrip
3000
A1 A2
B1 B2
C1
C2
G1 G2
50/51
50G/51G