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    AS 1740-1990

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Electrical equipment for coal mines - Transformer substations for use underground

    Available format(s):  Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Superseded date:  28-03-2023

    Language(s):  English

    Published date:  01-01-1990

    Publisher:  Standards Australia

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    Table of Contents - (Show below) - (Hide below)

    1 - AS 1740-1990 ELECTRICAL EQUIPMENT FOR COAL MINES - TRANSFORMER SUBSTATIONS FOR USE UNDERGROUND
    4 - PREFACE
    5 - CONTENTS
    7 - SECTION 1 SCOPE AND GENERAL
    7 - 1.1 SCOPE.
    7 - 1.2 APPLICATION.
    7 - 1.3 REFERENCED DOCUMENTS.
    8 - 1.4 DEFINITIONS.
    9 - SECTION 2 GENERAL REQUIREMENTS FOR DESIGN AND CONSTRUCTION
    9 - 2.1 GENERAL REQUIREMENTS.
    9 - 2.2 SUPPLY SYSTEM.
    9 - 2.3 PREFERRED RATINGS.
    9 - 2.4 INSULANT.
    9 - 2.5 MAXIMUM SURFACE TEMPERATURE.
    9 - 2.6 TRANSFORMERS.
    9 - 2.6.1 General.
    9 - 2.6.2 Lifting and anchoring of core.
    9 - 2.6.3 Voltage adjustment tappings.
    10 - 2.6.4 Neutral conductor.
    10 - 2.7 SWITCHING DEVICES.
    10 - 2.7.1 General.
    10 - 2.7.2 Circuit-breakers.
    10 - 2.7.3 Switch-fuse combinations.
    10 - 2.7.4 Operation.
    10 - 2.7.5 Contactors.
    10 - 2.8 MOUNTING.
    10 - 2.9 MEASURING INSTRUMENTS.
    10 - 2.10 PREVENTION OF ARCING FAULTS.
    10 - 2.11 CABLES.
    10 - 2.12 PROTECTION AND MONITORING.
    10 - 2.12.1 General.
    10 - 2.12. 2 Arrangement of protection.
    11 - 2.12.3 Overcurrent and short-circuit protection.
    11 - 2.12.4 Overload protection.
    11 - 2.12.5 Earth-fault/ Earth-leakage protection.
    11 - 2.12.6 Earth-continuing protection.
    11 - 2.12.7 Earth-fault lockout protection.
    11 - 2.12.8 Earth-fault current limitation.
    11 - 2.12.9 Undervoltage protection.
    11 - 2.12.10 Loss of vacuum protection.
    11 - 2.12.11 Frozen contact protection.
    11 - 2.12.12 Under/over pressure protection.
    13 - 2.12.12 Under/over pressure protection.
    13 - 2.12.13 Overtemperature protection.
    13 - 2.13 TESTING AND INDICATING FACILITIES.
    13 - 2.14 SYSTEM FAULT LEVELS.
    13 - 2.15 SHORT-CIRCUIT PROTECTION AND SHORT-CIRCUIT CAPACITY.
    13 - 2.15.1 General.
    13 - 2.15.2 Current-limiting devices.
    13 - 2.16 AUXILIARY CIRCUITS.
    13 - 2.17 CABLE FITTINGS.
    13 - 2.18 TERMINALS.
    13 - 2.18.1 General.
    14 - 2.18.2 Arrangement of terminals.
    14 - 2.19 EARTHING.
    14 - 2.19.1 General.
    14 - 2.19.2 Earth terminal.
    14 - 2.19.3 Attachment of earth strap.
    14 - 2.19.4 Special earthing requirements.
    14 - 2.19.5 Doors and covers.
    14 - 2.20 CIRCUIT DIAGRAMS.
    14 - 2.21 EQUIPMENT IDENTIFICATION.
    14 - 2.22 MARKING.
    14 - 2.22.1 Method of marking.
    14 - 2.22.2 Information to be marked.
    14 - 2.23 WARNING PLATES.
    15 - SECTION 3 SPECIFIC REQUIREMENTS FOR SUBSTATIONS FOR USE IN NON-HAZARDOUS AREAS
    15 - 3.1 SWITCHGEAR ENCLOSURES.
    15 - 3.2 PRIMARY AND SECONDARY SWITCHGEAR.
    15 - 3.2.1 Primary side.
    15 - 3.2.2 Secondary side.
    15 - 3.2.3 Loss of insulating medium.
    15 - 3.3 INTERLOCKING.
    15 - 3.4 PROTECTION FROM ARCING FAULTS.
    16 - SECTION 4 SPECIFIC REQUIREMENTS FOR SUBSTATIONS FOR USE IN HAZARDOUS AREAS
    16 - 4.1 GENERAL
    16 - 4.2 APPROVAL.
    16 - 4.3 PRIMARY AND SECONDARY SWITCHGEAR.
    16 - 4.3.1 Primary side.
    16 - 4.3.2 Secondary side.
    16 - 4.3.3 Loss of insulating medium.
    16 - 4.4 CONTROL CABLING.
    16 - 4.5 INTERLOCKING.
    16 - 4.5.1 General.
    16 - 4.5.2 Methods of interlocking.
    17 - 4.5.3 Mechanical interlocking.
    17 - 4.5.4 Electrical interlocking.
    17 - 4.5.5 Electromechanical interlocking.
    17 - 4.6 TRANSFORMER UNIT- EXPLOSION-PROTECTED.
    17 - 4.6.1 Flameproof construction.
    17 - 4.6.2 Other explosion-protection construction.
    18 - 4.7 MARKING.
    19 - SECTION 5 ROUTINE TESTS
    19 - 5.1 GENERAL.
    19 - 5.2 INSULATION RESISTANCE TEST.
    19 - 5.3 HIGH VOLTAGE TEST.
    19 - 5.3.1 General.
    19 - 5.3.2 Test voltage.
    19 - 5.3.3 Test equipment.
    19 - 5.3.4 Procedure.
    19 - 5.3.5 Criteria of acceptance.
    20 - 5.4 FUNCTION TEST.
    20 - 5.5 ADDITIONAL TESTS.
    21 - SECTION 6 TYPE TESTS
    21 - 6.1 GENERAL.
    21 - 6.1.1 Verification of compliance.
    21 - 6.1.2 Nature of type tests.
    21 - 6.1.3 Certificates of type test.
    21 - 6.1.4 Exemption from re-test.
    21 - 6.2 EXPLOSION-PROTECTION TESTS.
    21 - 6.2.1 General.
    21 - 6.2.2 Pressure test.
    21 - 6.2.3 Vacuum test.
    21 - 6.3 VERIFICATION OF THE SHORT-CIRCUIT CAPACITY.
    21 - 6.3.1 Circuits which shall be verified by tests.
    21 - 6.3.2 Test sections.
    21 - 6.3.3 Primary section enclosure.
    21 - 6.3.4 Transformer section enclosure.
    22 - 6.3.5 Secondary section enclosure.
    22 - 6.3.6 Relationship between peak and r.m.s. values for short-circuit current.
    22 - 6.3.7 Test arrangement.
    22 - 6.3.8 Performance of the tests- General.
    23 - 6.3.9 Testing of the power circuits.
    24 - APPENDIX A - INFORMATION TO BE SUPPLIED BY THE PURCHASER
    24 - A1 SUPPLY SYSTEM.
    24 - A2 CONNECTED ELECTRICAL EQUIPMENT.
    24 - A3 SUBSTATION.
    24 - A5 CABLES AND CABLE ENTRIES.
    25 - APPENDIX B - RECOMMENDED PROCEDURE FOR OBTAINING APPROVAL

    Abstract - (Show below) - (Hide below)

    Specifies requirements for transformer substations for use in non-hazardous areas and hazardous areas and intended primarily for supplying power to machinery below ground in coal mines.

    Scope - (Show below) - (Hide below)

    This Standard specifies the minimum requirements for transformer substations (hereinafter referred to as a substation(s)) for use in non-hazardous areas and hazardous areas and intended primarily for supplying power to machinery below ground in coal mines.NOTE: Substations may require approval by the relevant Regulatory Authority.

    General Product Information - (Show below) - (Hide below)

    Committee EL-023
    Document Type Standard
    Publisher Standards Australia
    Status Superseded
    Superseded By
    Supersedes

    History - (Show below) - (Hide below)

    Under Revision see DR 99403

    Standards Referencing This Book - (Show below) - (Hide below)

    AS 2290.2-1993 Electrical equipment for coal mines - Maintenance and overhaul - Overhaul and repair of electrical equipment for hazardous areas
    AS/NZS 3800:2005 Electrical equipment for explosive atmospheres - Repair and overhaul
    AS/NZS 3800:1997 Electrical equipment for explosive atmospheres - Overhaul and repair
    HB 13-2000 Electrical equipment for hazardous areas
    SAA HB37.2-1993 Handbook of Australian fire Standards Electrical equipment (Reconfirmed 2016)
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