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SE-325
Littelfuse Startco SE-325 User Manual
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SE-325 MANUAL
NEUTRAL-GROUNDING-RESISTOR MONITOR
MAY 6, 2008
REVISION 10
F1
RESET
POWER
GROUND
FAULT
GF
TRIP
TIME
(s)
RESI
S
T
OR
FAULT
RES
TRIP
LEVEL
(VAC)
CT1
CT2
AB
RI
GI
SW
L1
R
L2
G
STARTCO
ENGINEERING
LTD.
NGR
MONITOR
SE-325
MODE
RES
GF
20
400
200
0.1
2.0
1.0
4.0
A
2.0
A
0.5
A
SH
UV
20K
Copyright
©
2008 by Startco Engineering Ltd.
All rights reserved.
Publication: SE-325-M
Document:
S95-C325-00000
Printed in Canada.
2
Table of Contents
Default Chapter
3
Table of Contents
3
SE-325 Neutral-Grounding-Resistor Monitor Rev
4
General
5
Modern Resistance-Grounded Systems
5
SE-325 NGR Monitoring
5
Operation
5
Settings
5
GF Trip Time
5
Mode
6
2.1.4 Res
6
RES Trip Level
6
Indication and Reset
6
Fusing
6
Settings for Typical Systems
6
Installation
7
Se-325
7
Typical Application
7
SE-325 Outline and Mounting Details
8
Ground-Fault CT
9
Current Transformers
9
Sensing Resistor
10
ER-600VC Sensing Resistor
10
ER-5KV Sensing Resistor
11
ER-15KV Sensing Resistor
12
ER-25KV Sensing Resistor
13
RK-302 Remote Indication and Reset
14
RK-325 Remote Indication-And-Reset Assembly
14
RK-325I Remote Indication Assembly
15
Relay Interface Module
15
Isolated-Ground Connection
16
Overhead Lines
16
Remote Operation
16
Ground-Fault Testing
16
Technical Specifications
16
Se-325
16
Sensing Resistors
17
Current Transformer
17
Ordering Information
18
Warranty
18
Test Procedures
19
Ground-Fault Performance Test
19
Ground-Fault-Test Circuits
19
Ground-Fault-Test Record
19
Resistor-Fault Tests
20
Open Test
20
Voltage Test
20
Sensing-Resistor Test
20
4
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Littelfuse Startco SE-325 Specifications
General
Brand
Littelfuse Startco
Model
SE-325
Category
Monitor
Language
English
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