Littelfuse T2900 User Manual
Protection Relays & Controls
Generator & Single-Function Protection–Differential
T2900 SERIES
3-Phase Differential Relay
Simplified Circuit Diagram
1
SUPPLY
2
DEVICE UNDER
PROTECTION
U
T2900
3
(3-Phase Differential Relay)
11
I
1
12
13
I
2
14
15
I
3
16
DIFFERENTIAL
CURRENT
Description
The T2900 3-Phase Differential Relay is designed for
monitoring current leakage in generators. The T2900
measures the differential current of each of the 3 phases.
The differential currents are measured by connecting a
current transformer for each winding in parallel with inverse
polarity. The highest of the 3 currents is selected and,
if it exceeds the preset level (0.04-0.4 x I
LED will indicate this and the delay timer will be started.
), the pick-up
N
After the preset time has expired, the output relay and
the corresponding LED will be activated, provided that the
current level was exceeded for the entire delay time. The time
delay can be adjusted between 1-10 sec. This time delay can
be reduced by a factor 10 by bridging terminals 18 and 19.
Features & Benefits
FEATURES BENEFITS
19
18
Accepts high supply
voltage variation
10
9
Visual indication of power,
8
pick-up, and output trip
7
Direct line-line or line-
6
5
neutral voltage supply (up
to 690 Vac)
Built-in capacitor
back-up supply
Galvanic isolated inputs
DIN-rail or screw-mount
& adjustment by
potentiometers
Ensures correct operation in spite of voltage
supply fluctuations (fulfills marine class
requirement)
Provides quick and concise status information
Simplifies design and installation.
No need for PTs.
Ensures correct operation in spite of drop in
the supply voltage
Protects the unit against high AC voltage and
currents from the installation including spikes
Easy installation
L
1L2L3
Bridge between termi nals 5 and 6 resu lts in lat ching relay.
Bridge between termi nals 18 and 19 red uces time delay to 0.1-1 sec.
Ordering Information
ORDERING NUMBER
T2900.0010 450 V 400 V 5 A
T2900.0020 230 V 5 A
T2900.0030 480 V 415 V 5 A
T2900.0040 110 V 100 V 5 A
Standard t ypes: IN = 5 A and outp ut relay normally de-energized.
Other combinations and voltages are available on reques t.
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t2900
TERMINALS
1-3 2-3
Specifications
Trip Level 0.04-0.4 x I
Delay 1-10 sec. (0.1-1 sec. when bridging terminals 18 and 19)
Max. Voltage 660 V
Voltage Range 60-110 %
Consumption
I
N
Current 0.3 VA at I
Continuous Current 2 x I
Voltage 5 VA at UN
Frequency Range 45- 400 Hz
Output Relay Normally de-energized, latching, resetable
Contact Rating AC: 400 V, 5 A, 2000 VA
DC: 150 V, 5 A, 150 W
Overall Accuracy ±5%
Repeatability ±1%
Operating Temperature
–20°C to + 70°C
Dielectric Test 2500 V, 50 Hz
EMC CE according to EN50081-1, EN50082-1, EN50081-2,
EN50082-2
Approvals Certified by major marine classification societies
Burn-in 50 hours before final test
Enclosure Material Polycarbonate. Flame retardant
Weight 0.5 kg
Dimensions H 70 mm (2.76”); W 100 mm (3.94”); D 115 mm (4.52”)
Installation 35 mm DIN rail or 4 mm (
N
N
N
3
/16”) screws
Rev: 4-A-050213
Loading...