Littelfuse SE-145 Series - Manual

Protection Relays & Controls
© 2013 Littelfuse Protection Relays & Controls
Littelfuse.com/se-145
SE-145 SERIES
Ground-Fault Ground-Check Monitor
Description
The SE-145 is a three-channel, microprocessor-based,
combination ground-wire monitor and ground-fault relay for
resistance-grounded or solidly grounded systems. It continuously
monitors the integrity of the ground wire to protect portable
equipment from hazardous voltages caused by ground faults. The
SE-145 is designed for use on three-way splitter box applications.
Specifications
IEEE Device Numbers Checking or Interlocking Relay (3GC),
Ground fault (50G/N, 51G/N)
Input Voltage 60-265 Vac, 60VA; 82-275 Vdc, 45W;
18-30Vdc, 45W
Dimensions H 213 mm (8.4"); W 192 mm (7.6"); D 176 mm (7.0")
Trip Level Settings 0.5-12.5 A or 2.0-50.0 A
Trip Time Settings 0.1-2.5 s
Contact Operating Mode Selectable fail-safe or non-fail-safe
Harmonic Filtering Standard feature
Test Button Standard feature
Reset Button Standard feature
Communications Ethernet Optional
Output Contacts Isolated Form A and Form B
Conformally Coated Standard feature
Warranty 5 years
Mounting Panel, Surface
ORDERING NUMBER CONTROL POWER COMM
SE-145-00-00 120/240 Vac; 110-250 Vdc –
SE-145-03-00 120/240 Vac; 110-250 Vdc Modbus ® TCP
SE-145-30-00 24 Vdc Battery Back-up –
SE-145-33-00 24 Vdc Battery Back-up Modbus ® TCP
Ordering Information
See Current Transformer Selection Guide and Accessory Information.
SE-CS10 Series Ground-Fault Current
Transformer
Zero-sequence current transformer detects
ground-fault current. Provides 0.5 to 12.5 A
trip range.
SE-TA12A Series Termination Assembly
Required termination assembly; temperature
compensated.
Accessories
A
B
FEATURES BENEFITS
Adjustable pickup
(0.5 - 12.5 A)
Unit can be used on a wide variety of trailing cable
applications
Adjustable time delay
(1 - 2.5 s)
Adjustable trip delay for quick protection and system
coordination
Output contacts
Separate annunciation of ground-fault and ground-
check faults
Ground-check
LED indication
Indication of open or short ground-check wire
makes it easier to find faults
CT-Loop monitoring Alarms when CT is not connected
High-induced-ac
rejection
Makes unit suitable for applications with high
voltages and long cables
DFT (harmonic) filter Prevents false operation
Zener-characteristic
termination assembly
Provides reliable ground-check loop verification
Fail-safe circuits
Ensures ground-check and ground-fault circuits
remain safe even in the event of equipment failure
Conformal coating
Additional coating protects circuit boards against
harsh environment
Features & Benefits
ACCESSORIES REQUIREMENT
SE-CS10 or SE-CS40 Series Required
SE-TA12A Series Required
RK-132 Optional
Trailing Cable Protection–Ground-Fault Ground-Check Monitoring
SE-CS40 Series Ground-Fault Current
Transformer
Zero-sequence current transformer detects
ground-fault current. Provides 2.0 to 50 A
trip range.
C
TRAILING
CABLE
CHANNEL A
CHANNEL B
CHANNEL C
TRIP A
CT
L2
L1
TERMINATION
DEVICE
A
G
GC
C
B GROUNDED
SUPPLY M
SE-145
SERIES
(Ground-Fault
Ground-Check
Monitor)
B A
Rev: 4-C-121013
Simplified Circuit Diagram
Application Diagram
L2
SE-135
L1
LOAD C
GC
G
SUBSTATION
GC
G
SE-145
GC A G A
GC B
G B
GC C
G C
GC
G
SPLITTER
BOX
SE-TA12A
LOAD B
GC
G
SE-TA12A
LOAD A
GC
G
SE-TA12A
SE-TA12A
MODEM COMM
TRIP A
TRIP B
TRIP C
C
C
C
C