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Protection Relays & Controls
Generator & Single-Function Protection–Excitation Loss
T2100 Series
Excitation Loss Relay
Description
The T2100 Excitation Loss Relay protects against loss of
excitation in a synchronous generator. T2100 detects the
high-inductive current running into a generator in case of
low excitation. The faulty generator breaker is tripped, thus
protecting the generator, and avoiding undervoltage on the
busbar with a possible blackout of the system.
The T2100 calculates I x sin φ, representing the reactive
power. If the reactive power becomes negative and exceeds
the preset level (0.5-1.5 x IN), the pickup LED will indicate
and the delay timer will be started. After the preset time
(2-20 sec.) has expired, the output relay and LED will be
activated, provided that the negative reactive power level
was exceeded for the entire delay time.
Simplified Circuit Diagram
G
L - L SUPPLY
Features & Benefits
Features
1
2
3
13
RESET
14
Accepts high supply
voltage variation
T2100
7
8
9
10
(Excitation
Loss
Relay) 5
6
L1
C/B TRIP
L2
L3
LOAD
G
L - N SUPPLY
T2100
7
8
9
10
6
L1
C/B TRIP
L2 L3
LOAD
Ordering Information
Ordering
Number
1-3
T2100.0010
230 V
5A
L-N
T2100.0020
480 V 415 V 5 A
L-L
T2100.0030
450 V 400 V 5 A
L-L
T2100.0040
110 V 100 V 1 A
L-L
T2100.0050
110 V 100 V 5 A
L-L
T2100.0060
110 V 100 V 5 A
L-L
Current 0.2-1.2 x IN
T2100.0070
480 V 415 V 5 A
L-L
Normally energized output,
current 0.05 -0.15 x IN
T2100.0080
110 V 100 V 5 A
L-L
24 V DC aux. voltage
supply, current 0.2 1.2 x IN
2-3
IN
Galvanic isolated inputs
Provides quick and concise status information
Simplifies design and installation.
No need for PTs.
Safe operation. Maintains protection
regardless of system voltage failure
Protects the unit against high AC voltage and
currents from the installation including spikes
Easy installation
Specifications
(Excitation
Loss
Relay) 5
Terminals
Available with separate
24 Vdc supply
DIN-rail or screw-mount
& adjustment by
potentiometers
1
2
3
13
RESET
14
Visual indication of
power, pick-up, and
output trip
Direct line-line or lineneutral voltage supply
(up to 690 Vac)
BENEFITS
Ensures correct operation in spite of voltage
supply fluctuations (fulfills marine class
requirement)
supply function
Trip Level
0.5-1.5 x IN
Delay
2-20 sec.
Max. Voltage
660 V
Voltage Range
50-110%
Voltage 5 VA at UN
Consumption
Current 0.3 VA at IN
Continuous Current
2 x IN
Frequency Range
45-400 Hz
Output Relay
Normally de-energized, latching, resetable
Contact Rating
AC: 400 V, 5 A, 1250 VA
DC: 150 V, 5 A, 120 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
DimensionsH 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
www.BDTIC.com/littelfuse
Other supply voltages and combinations are available on request.
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/t2100
Rev: 4-A-050213