EasyManua.ls Logo

Littelfuse Startco SE-325 User Manual

Littelfuse Startco SE-325
20 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Page #1 background imageLoading...
Page #1 background image
SE-325 MANUAL
NEUTRAL-GROUNDING-RESISTOR MONITOR
MAY 6, 2008
REVISION 10
F1
RESET
POWER
GROUND
FAULT
GF TRIP
TIME (s)
RESIST
OR
FAULT
RES TRIP
LEVEL (VAC)
CT1
CT2
AB
RIGISW
L1
R
L2
G
STARTCO
ENGINEERING LTD.
NGR MONITOR
SE-325
MODE
RESGF
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.
Question and Answer IconNeed help?

Do you have a question about the Littelfuse Startco SE-325 and is the answer not in the manual?

Littelfuse Startco SE-325 Specifications

General IconGeneral
Voltage120/240 VAC
Frequency50/60 Hz
ResetManual or Automatic
Current Rating5 A
Enclosure RatingNEMA 1
Contact ConfigurationSPDT
Contact MaterialSilver Alloy
Alarm ContactSPDT
Trip ContactSPDT
Operating Temperature-40°C to +60°C
MountingPanel

Summary

GENERAL

Modern Resistance-Grounded Systems Explained

Explains high-resistance grounding benefits and system types.

SE-325 Neutral-Grounding-Resistor Monitor Overview

Describes the SE-325's functions and measurement capabilities.

OPERATION

SE-325 Operational Settings

Details adjustable parameters like trip time and trip levels.

Ground-Fault Trip Time Adjustment

Explains adjustment range for ground-fault trip time.

Ground-Fault Trip Level Configuration

Defines ground-fault trip levels and their relation to resistor ratings.

Operating Mode Selection: Shunt-Trip vs. Undervoltage

Differentiates between shunt-trip (SH) and undervoltage (UV) modes.

Sensing Resistor and Trip Level Settings

Explains setting resistor type (20k or 100k) and neutral-to-ground trip voltage.

Device Indication and Reset Functions

Describes front panel LEDs and reset functionality.

Output Relay Fusing

Specifies the fuse protection for the output contact.

INSTALLATION

SE-325 Unit Mounting and Connections

Provides outline, mounting, and connection details for the SE-325 unit.

Ground-Fault Current Transformer Installation

Details outline, mounting, and connection of the ground-fault current transformer.

Sensing Resistor Installation Details

Provides outline, mounting, and connection details for sensing resistors.

Special Installation Considerations

Covers isolated grounds, overhead lines, and remote operation setup.

Ground-Fault Circuit Testing Procedures

Outlines procedures for testing the ground-fault circuit.

TECHNICAL SPECIFICATIONS

SE-325 Technical Specifications

Lists detailed electrical and physical specifications for the SE-325.

Sensing Resistor Specifications

Lists specifications for various sensing resistor models.

Current Transformer Specifications

Lists specifications for the CT200 current transformer.

ORDERING INFORMATION

WARRANTY

TEST PROCEDURES

Ground-Fault Performance Test Procedure

Step-by-step guide for testing ground-fault protection performance.

Resistor-Fault Detection Tests

Outlines tests to verify resistor-fault detection functionality.

Sensing Resistor Integrity Test

Describes how to test the sensing resistor's continuity and resistance.