High Resistance Ground Unit

High Resistance Ground Unit
For Use on 480 and 600 Volt Wye and
Delta-Connected Sources
50 or 60 Hertz Systems
Sistema de resistencias
de puesta a tierra
Para su uso en sistemas de 50 ó 60 Hz
con fuentes conectadas en estrella o delta
de 480 y 600 V
Système de résistances
de mise à la terre élevées
Pour une utilisation sur des sources
de 480 et 600 V raccordées en étoile et
triangle—Systèmes de 50 ou 60 Hertz
Class / Clase / Classe 6036
Instruction Bulletin
Boletín de instrucciones
Directives d'utilisation
80298-165-01
Retain for Future Use. / Conservar para
uso futuro. / À conserver pour usage
ultérieur.

Instruction Bulletin
80298-165-01
Retain for future use.
High Resistance Ground Unit
For Use on 480 and 600 Volt Wye and
Delta-Connected Sources
50 or 60 Hertz Systems
Class 6036

ENGLISH
HAZARD CATEGORIES AND
SPECIAL SYMBOLS
Read these instructions carefully and look at the equipment to become
familiar with the device before trying to install, operate, service or maintain
it. The following special messages may appear throughout this bulletin or on
the equipment to warn of potential hazards or to call attention to information
that clarifies or simplifies a procedure.
The addition of either symbol to a “Danger” or “Warning” safety label
indicates that an electrical hazard exists which will result in personal injury if
the instructions are not followed.
This is the safety alert symbol. It is used to alert you to potential personal
injury hazards. Obey all safety messages that follow this symbol to avoid
possible injury or death.
PLEASE NOTE Electrical equipment should be installed, operated, serviced, and
maintained only by qualified personnel. No responsibility is assumed by
Schneider Electric for any consequences arising out of the use of this
material.
DANGER
DANGER indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
WARNING
WARNING indicates a potentially hazardous situation which, if not
avoided, can result in death or serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation which, if not
avoided, can result in minor or moderate injury.
CAUTION
CAUTION, used without the safety alert symbol, indicates a potentially
hazardous situation which, if not avoided, can result in property damage.
Provides additional information to clarify or simplify a procedure.

80298-165-01 High Resistance Ground Unit for Use on 480 and 600 Volt Wye and Delta-Connected Sources
06/2008 Table of Contents
© 1995–2008 Schneider Electric All Rights Reserved 3
ENGLISH
TABLE OF CONTENTS
Section 1—Introduction ............................................................................... 5
Section 2—Safety Precautions ................................................................... 7
Section 3—Receiving, Handling, Storage, and Installation ......................... 8
Receiving ............................................................................................... 8
Handling ................................................................................................ 8
Storage .................................................................................................. 8
Installation ............................................................................................. 8
Section 4—Typical High Resistance Grounding System ............................ 8
Low Voltage Systems ............................................................................ 8
Control Power Transformer (CPT) ........................................................ 8
Derived Neutral ..................................................................................... 8
Resistor and Enclosure Material ........................................................... 9
Resistor Unit.................................................................................... 9
Equipment Enclosure ...................................................................... 9
Principles of Operation ........................................................................ 10
Ungrounded Systems .................................................................... 10
High Resistance Grounding........................................................... 10
Pulse Fault Locator Circuit ............................................................ 10
Ground Detection and Alarm ......................................................... 10
Ground Current Detector ............................................................... 11
System Capacitive Charging Current .................................................. 11
Selection of Ground Resistor Value and Connections ........................ 12
Resistor Circuit Diagrams .................................................................... 12
Door Components ............................................................................... 14
Alarm Horn .................................................................................... 15
Ammeter ........................................................................................ 15
Red Light ....................................................................................... 15
Green Light.................................................................................... 15
Amber Light ................................................................................... 15
Silence Button ............................................................................... 15
Reset/Manual/Auto Switch ............................................................ 15
Normal/Pulse Switch ..................................................................... 15
Test Button .................................................................................... 15
Voltmeter Relay ............................................................................. 15
Internal Components ........................................................................... 16
Start-Up Procedures ............................................................................ 17
HRG System Diagrams ....................................................................... 18
Ground Detection System Test ........................................................... 19
Use of the System Under Actual Grounded Condition ........................ 20
Power System Revisions ..................................................................... 21
Records ............................................................................................... 21
System Initial Installation ............................................................... 21
Voltmeter Readings ....................................................................... 21
Voltmeter Relay Set Points............................................................ 21
System Faults................................................................................ 21
Section 5—Inspection and Maintenance .................................................. 22
Section 6—Nameplate Information ........................................................... 23
Section 7—Accessory Equipment ............................................................. 23
Portable Ground Current Detector ...................................................... 23
Section 8—Installation and Maintenance Logs ......................................... 24