SE-325ES - SE-325 Series

Series: SE-325
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The SE-325 Neutral-Grounding-Resistor Monitor is used on resistance-grounded systems up to 25 kV to monitor the integrity of the neutral-to-ground path and to detect ground faults. It measures current and voltage in a transformer or generator neutral-to-ground connection and continuity of the neutral-grounding resistor (NGR). The SE-325 coordinates these three measurements to detect a loose connection, corrosion, ground fault, or NGR failure, and provides one alarm or trip output contact.

Product Literature

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NGR Set-Point Assistant

NGR-Thumb Click here to use the
NGR Set-Point Assistant

Weather-Protected Sensing Resistor

Littelfuse ER-5WP

Property (Mouseover for details) Value
Relay Contacts Config 1 Form A (N.O.)
Supply Voltage ac 240
IEEE Device Numbers 50G - 50N - 51G - 51N - 59N - 86
Relay Contacts Operation Fail-safe / Non Fail-safe
Weight (lbs/g) 0 Kg
Conformally coated Standard
Frequency 50; 60; ASD
GF Trip Level A 0.5 - 4.0
GF Trip Time s 0.1 - 2.0
Harmonic Filtering Standard
Reset Type Front-panel switch/Remote Kit
RF Trip Level V 20 - 400 (systems up to 5 kV); 100 - 2000 (systems over 5 kV)
RF Trip Time s 20
System type Resistance Grounded AC

pdf icon SE-325 Manual

A high-resistance-grounded system uses a neutralgrounding resistor (NGR) with a low let-through current to limit ground-fault current. This is an improvement over low-resistance- or solidly grounded systems because, in those systems, a ground-fault flash hazard exists and a ground fault can result in substantial point-of-fault damage.
pdf icon SE-325 Manual Russian

pdf icon SE-325 Cross Reference Russian

pdf icon SE-325 Manual Chinese

dwg SE-325 CAD Drawing

dwg ER-600VC CAD Drawing

dwg ER-25kv CAD Drawing

dwg Littelfuse Protection Relays RK-302 CAD Drawing

dwg Littelfuse Protection Relays RK-325 CAD Drawing

pdf icon TN GF-10 Pulsing Ground-Fault Systems

pdf icon TN RG-01 NGR Monitoring Isolated Ground Beds

pdf icon TN RG-02 SE-325 on Alarm Only Systems

pdf icon TN RG-03 SE-325 Settings

pdf icon TN RG-04 SE-325 Guideform Specification

pdf icon TN RG-06 SE-VS1002K Voltage Scaler

pdf icon TN RG-07 SE-VS50010K Voltage Scaler

pdf icon TN RG-09 Single NGR for Multiple Sources

pdf icon TN-RG11 Voltage Metering on RG Systems

pdf icon TN RG-12 Convert Ungrounded to Resistance Grounded

pdf icon TN RG-14 NGR Package Checklist

pdf icon TN RG-15 Implementing Resistance Grounding on Solidly Grounded Systems

SE-325 STP 3D Model

pdf icon TN 11-1 Ground-Fault CT Selection Guide

11-1AU Earth-Fault CT Selection Flowchart Australia

EARTH-FAULT-CT SELECTION FLOWCHART...
pdf icon 11-2 Locating Phase Conductors in a Zero-Sequence-CT Window

An ideal window-type current transformer responds only to the sum of the currents flowing through its window...
pdf icon 11-4 Trailing Cable Types

pdf icon 11-5 Polycast 200 5 CT Test

POLYCAST 200:5 CT TEST TECHNICAL INFORMATION...
pdf icon 11-7 Locating Phase Conductors in a Zero-Sequence CT Window

pdf icon Protection Relays and Controls Catalog - Mandarin

pdf icon SE-325 Datasheet

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