AS/NZS 2081.2:2002

1 - AS/NZS 2081.2:2002 ELECTRICAL EQUIPMENT FOR COAL AND SHALE MINES-ELECTRICAL PROTECTION DEVICES - EARTH-CONTINUITY...
4 - PREFACE
5 - CONTENTS
6 - FOREWORD
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 OBJECTIVE
7 - 1.3 RELATIONSHIP TO REGULATIONS
8 - 1.4 REFERENCED DOCUMENTS
8 - 1.5 DEFINITIONS
8 - 1.5.1 Resetting value of a protection device
9 - SECTION 2 DESIGN AND CONSTRUCTION
9 - 2.1 GENERAL
9 - 2.2 OPERATING VALUES
9 - 2.2.1 General
9 - 2.2.2 Pilot-earth loop series resistance value
9 - 2.2.3 Shunt resistance value
9 - 2.2.4 Operating time
9 - 2.3 PROTECTION AGAINST FAULTS
10 - 2.4 INDICATION
10 - 2.5 SUPPLY TRANSFORMERS
10 - 2.6 INTRINSIC SAFETY
10 - 2.7 MARKING
11 - SECTION 3 TESTS
11 - 3.1 CATEGORIES OF TESTS
11 - 3.2 ROUTINE TESTS
11 - 3.2.1 General
11 - 3.2.2 Verification of operating values
11 - 3.3 TYPE TESTS
11 - 3.3.1 General
11 - 3.3.2 List and order of tests
12 - 3.3.3 Endurance test
12 - 3.3.4 Temperature and humidity cyclic test
12 - 3.3.5 Operating value test
12 - 3.3.6 Resetting value test
12 - 3.3.7 Operating time test
12 - 3.3.8 Supply voltage variation test
13 - 3.3.9 Electromagnetic interference immunity test
14 - APPENDIX A - INSTALLATION GUIDANCE
14 - A1 GENERAL
14 - A2 AUXILIARY COMPONENTS

Specifies requirements for earth-continuity monitoring devices intended to monitor the pilot-earth loop(s) in cables supplying power to equipment and the requirement to initiate tripping to prevent closure interruption of the circuit device, and requirements for stop/start/pilot control functions in the earth-continuity monitoring device. Test methods are included.

This Standard sets out minimum performance requirements for earth-continuity monitoring devices, intended to monitor the pilot-earth loop(s) in cables supplying power to equipment used on a.c. power supply systems having an earth-fault current limitation system (IT system). The requirement to initiate tripping and prevent closure/interruption of the circuit device in the event of the earth-loop resistance exceeding a predetermined range are also covered.Requirements are specified for remote stop/start/pilot control functions when incorporated in the earth-continuity monitoring device.NOTES: 1 Whereas this Standard is based upon 50 Hz supply systems it is envisaged that equipment may be installed upon higher or low frequency supply systems.Consideration of the effects of these installations upon current limitation and effects upon the human body need to be considered. IEC 60479-1 and IEC 60479-2 should be referenced for the effects upon the human body of other supply frequencies.2 Installation recommendations are provided in Appendix A.

First published as part of AS C318-1958.
Revised and redesignated as AS 2081-1977.
AS 2081-1977 revised and redesignated in part as AS 2081.2-1988.
Jointly revised and designated AS/NZS 2081.2:2002.