AS 2989-1992

1 - AS 2989-1992 ELECTRICAL EQUIPMENT FOR COAL MINES - SPECIFIC REQUIREMENTS FOR HIGH VOLTAGE CIRCUIT-BREAKERS AND DISCONNECTORS
4 - PREFACE
5 - CONTENTS
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 SCOPE
7 - 1.2 REFERENCED DOCUMENTS
7 - 1.3 DEFINITIONS
7 - 1.3.1 Disconnector
8 - SECTION 2 GENERAL REQUIREMENTS FOR DESIGN AND CONSTRUCTION
8 - 2.1 GENERAL
8 - 2.2 APPROVAL
8 - 2.3 CIRCUIT-BREAKER- GENERAL
8 - 2.3.1 Rating
8 - 2.3.2 Loss of insulating medium
8 - 2.3.3 Loss of supply
8 - 2.3.4 Operating mechanism
8 - 2.3.5 Operation counters
8 - 2.4 CIRCUIT-BREAKER- FIXED
8 - 2.4.1 General
8 - 2.4.2 Operating positions
8 - 2.4.3 Interlocking
8 - 2.5 CIRCUIT-BREAKER- WITHDRAWABLE
8 - 2.5.1 General
8 - 2.5.2 Operating positions
9 - 2.5.3 Isolation
9 - 2.5.4 Interlocking
9 - 2.6 DISCONNECTOR
9 - 2.6.1 Compliance
9 - 2.6.2 Rating
9 - 2.6.3 Operating positions
9 - 2.6.4 Visibility
9 - 2.6.5 Interlocking
9 - 2.7 RATED SHORT-TIME WITHSTAND CURRENT
9 - 2.8 ENCLOSURE
9 - 2.8.1 General
9 - 2.8.2 Mounting
9 - 2.8.3 Enclosure design
9 - 2.9 INSULATION, CABLES AND TERMINATIONS
9 - 2.10 AUXILIARY POWER SUPPLY ARRANGEMENTS
9 - 2.10.1 General
10 - 2.10.2 Regulatory authority insulation tests
10 - 2.11 EARTHING
10 - 2.11.1 General
10 - 2.11.2 Terminals
10 - 2.11.3 Doors and covers
10 - 2.12 SAFETY EARTHING OF OUTGOING HIGH VOLTAGE CIRCUIT
10 - 2.13 INTERLOCKING
10 - 2.14 OVERCURRENT AND SHORT-CIRCUIT PROTECTION
10 - 2.15 EARTH-FAULT PROTECTION
10 - 2.16 CIRCUIT-BREAKER TRIPPING DEVICE
11 - 2.17 MEASURING INSTRUMENTS
11 - 2.18 INDICATING DEVICES
11 - 2.19 REMOTE CONTROL
11 - 2.20 INTERNAL SEGREGATION
11 - 2.21 CABLE COUPLING DEVICES
11 - 2.22 TESTING FACILITIES
11 - 2.23 MARKING
11 - 2.24 WARNING LABELS
12 - SECTION 3 SPECIFIC REQUIREMENTS FOR ENCLOSURES FOR USE IN HAZARDOUS AREAS
12 - 3.1 GENERAL
12 - 3.2 FASTENERS
12 - 3.3 SEALING
12 - 3.4 INSULATED STUDS
12 - 3.5 OPERATING SPINDLE BUSHES
12 - 3.6 VIEWING WINDOW
12 - 3.7 APPROVAL
12 - 3.7.1 General
12 - 3.7.2 Tests for flame resistance of cables
12 - 3.7.3 Flammability of insulating materials
12 - 3.7.4 Test of windows and lenses
12 - 3.7.5 Pressure tests
12 - 3.7.6 Tests for intrinsically-safe circuits
12 - 3.7.7 Tests to determine explosion-protection characteristics
12 - 3.8 MAINTENANCE
13 - SECTION 4 SPECIFIC REQUIREMENTS FOR ENCLOSURES FOR USE IN NON-HAZARDOUS AREAS
13 - 4.1 GENERAL
13 - 4.2 ACCESS
13 - 4.3 SERVICE CONDITIONS
13 - 4.4 PRESSURE RELIEF
13 - 4.5 VISIBILITY OF EQUIPMENT
13 - 4.6 MAINTENANCE
14 - SECTION 5 TESTS
14 - 5.1 GENERAL
14 - 5.2 INSULATION RESISTANCE TEST
14 - 5.3 HIGH VOLTAGE TEST
14 - 5.3.1 General
14 - 5.3.2 Test voltage
14 - 5.3.3 Test equipment
14 - 5.3.4 Procedure
14 - 5.3.5 Criteria of acceptance
15 - 5.4 FUNCTION TEST
15 - 5.5 RATED SHORT-TIME WITHSTAND CURRENT
16 - APPENDIX A - TYPICAL CONNECTION DIAGRAMS

Specifies the requirements for an assembly which incorporates a high voltage circuit-breaker and an isolating device. It is limited to systems below ground at voltages up to and including 12 000 V a.c. The necessary provisions for isolation, safety earthing and regulatory inspection and testing procedures are also included.

This Standard specifies requirements for high voltage circuit-breakers and disconnectors, connected to three-phase, high voltage, power reticulation systems in underground coal mines, and controlling single outlet or multiple outlet circuits at voltages up to and including 12 200 V a.c. This Standard also includes the necessary provisions for isolation, safety earthing and, where applicable, facilities for regulatory authority inspection and testing requirements.NOTE: High voltage circuit-breakers and disconnectors are generally used on three-phase systems with nominal voltages of 6600 V and 11 000 V and may require approval by the relevant regulatory authority. Enquiries concerning approval may be made to the following: Department of Minerals and Energy, N.S.W.Department of Resource Industries, Qld Department of Mines, Tas.Department of Mines, W.A.Department of Mines and Energy, S.A.Department of Industry, Technology and Resources, Vic.

First published as AS 2989-1987.
Second edition 1992.