Generator Control
© 2013 Littelfuse Protection Relays & Controls
www.littelfuse.com/t2600
Basic Generator Protection
T2600 SERIES
Dual-Current Relay
Description
The T2600 Dual-Current Relay combines two current relays.
The function of the unit is to start or stop the standby diesel
generator according to the load situation. Current is measured
as a single phase measurement in each of the generators. Both
relays will respond to the highest of the currents, independent
of phase angle.
Starting signal: The starting output relay is controlled by the
high level start current relay (0.3-1.2 x I
N
) with a time delay
of 3-30 seconds. If one of the 3 input currents exceeds the
current setting for a longer period than the time setting, the
output relay will become deactivated.
Stopping signal: The low level current relay (0.2-0.8 x I
N
)
controls a time delay (1-10 minutes) which again controls the
stop output relay. If all input currents are lower than the current
setting for a longer period than the time delay setting of
1-10 minutes, the output relay will be activated.
Specifications
Start Level 30-120%
Delay 3-30 sec.
Stop Level 20-80%
Delay 1-10 min.
Max. Voltage 660 V
Voltage Range 60-110%
Consumption 5 VA at U
N
Frequency Range 40-65 Hz
Contact Rating AC: 400 V, 8 A, 2000 VA; DC: 35 V, 8 A, 150 W
Overall Accuracy ±3% of highest value
Repeatability ±1%
Operating Temp. –20°C to +70°C
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
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 (
3
/16”) screws
ORDERING
NUMBER
TERMINALS
I
N
FUNCTION
1-3 2-3
T2600.0010 230 V 5 A 30 sec. or 1 sec.*
T2600.0020 450 V 400 V 5 A 30 sec. or 1 sec.*
T2600.0030 480 V 415 V 5 A 30 sec. or 1 sec.*
T2600.0040 450 V 400 V 5 A
30 sec.*, bridge 17-18 = stop current
increased 34%
T2600.0050 480 V 5 A
30 sec.*, bridge 17-18 = stop current
increased 34%
T2600.0060 110 V 100 V 5 A 30 sec. or 1 sec.*
T2600.0070 110 V 100 V 5 A
30 sec. or 1 sec.*,
start current delay 1.0-10 secs
T2600.0080 230 V 5 A
30 sec. or 1 sec.*,
normally de-energized start relay
T2600.0090 Extension Unit
Ordering Information
Simplified Circuit Diagram
Features & Benefits
*Pulse duration time for stop signal, bridge 17-18 = 1 sec.
CONTROL POWER
STA RT
CIRCUIT
STOP
CIRCUIT
}
STOP
}
STA RT
I
1
U
I
2
I
3
2
3
11
12
13
14
15
16
17
18
2019
2019
1
10
9
8
7
6
5
4
G3
G1
Manual
Manual
G1
G3
G1
G1
G3
G1 G2
L
1
L
2
L
3
I
1
I
2
I
3
11
12
13
14
15
16
G6G4 G5
T2600
(Dual Current Relay)
FEATURES BENEFITS
Accepts high supply voltage
variation
Ensures correct operation in spite of voltage
supply fluctuations (fulfills marine class
requirement)
Visual indication of power,
pick-up, and output trip
Provides quick and concise status information
Direct line-line or line-neutral
voltage supply (up to 690 Vac)
Simplifies design and installation.
No need for PTs.
Simultaneous monitoring
of load level on
3 synchronous generators
Economic solution for load depending start/
stop of generators in parallel operation
Combining 2 trip outputs in
same enclosure
Providing both start signal to stand-by
generator and stop signal of running
generator from same unit
Extension module available
for monitoring of additional
3 generators
Economic and easy to install system
enhancement
Galvanic isolated inputs
Protects the unit against high AC voltage and
currents from the installation including spikes
DIN-rail or screw-mount
& adjustment by
potentiometers
Easy installation
To check relay operation, check that the “POWER” LED is on, ensuring that the supply is
present. Measure the supply voltage which must be compatible with information label on
top of enclosure. Measure the current circulating in terminals 11 -12, 13-14 and 15-16 and
observe that at least one of the currents are above setting. 0.5 x I
N
= 2.5A; 2 x I
N
= 10A.
Rev: 4-A-050313
(4 pages)
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