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AS
AS 1740-1990

AS 1740-1990

Superseded

Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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Superseded date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

Superseded by

AS/NZS 4871.3:2002
AS/NZS 4871.1:2002

Language(s)

English

Published date

01-01-1990

Publisher

Standards Australia

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Hardcopy - English
PDF 1 User - English
PDF 3 Users - English
PDF 5 Users - English
PDF 9 Users - English
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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

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.

Committee
EL-023
DocumentType
Standard
ISBN
0 7262 6204 8
Pages
19
PublisherName
Standards Australia
Status
Superseded
SupersededBy
Supersedes

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.

Under Revision see DR 99403

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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