1 - HB 242-2007 HIGH VOLTAGE MINING EQUIPMENT FOR USE UNDERGROUND
4 - PREFACE
5 - CONTENTS
7 - SECTION 1 SCOPE AND GENERAL
7 - 1.1 PURPOSE
7 - 1.2 SCOPE
7 - 1.3 REFERENCED STANDARDS
8 - 1.4 DEFINITIONS
8 - 1.4.1 Active (or active conductor)
8 - 1.4.2 Area, hazardous
8 - 1.4.3 Area, non-hazardous (safe)
8 - 1.4.4 Authorised person
8 - 1.4.5 Barrier (screen)
8 - 1.4.6 Circuit-breaker
9 - 1.4.7 Circuit interrupting device
9 - 1.4.8 Clearance
9 - 1.4.9 Competent person
9 - 1.4.10 Continuous rating
9 - 1.4.11 Creepage distance
9 - 1.4.12 Current, overload
9 - 1.4.13 Current, short-circuit
9 - 1.4.14 Direct contact
9 - 1.4.15 Disconnect switch
9 - 1.4.16 Earth continuity protection system
9 - 1.4.17 Earth/static discharging stick
9 - 1.4.18 Earth fault current
9 - 1.4.19 Earth-fault current limitation
10 - 1.4.20 Earth-fault protection
10 - 1.4.21 Earthable point
10 - 1.4.22 Earthed
10 - 1.4.23 Electrical equipment
10 - 1.4.24 Electrical installation
10 - 1.4.25 Enclosure
10 - 1.4.26 Equipotential bonding
10 - 1.4.27 Examination
10 - 1.4.28 Fault current
10 - 1.4.29 Feeder cable
10 - 1.4.30 High voltage
10 - 1.4.31 Indirect contact
10 - 1.4.32 Instructed persons
11 - 1.4.33 Insulated
11 - 1.4.34 International protection (IP) classification
11 - 1.4.35 Leakage current (in an installation)
11 - 1.4.36 Lockout earth-fault protection
11 - 1.4.37 Maintenance
11 - 1.4.38 Mobile machine
11 - 1.4.39 Neutral conductor (symbol N)
11 - 1.4.40 Ordinary persons
11 - 1.4.41 Plant
11 - 1.4.42 Portable equipment
11 - 1.4.43 Prospective touch voltage
12 - 1.4.44 Protection device
12 - 1.4.45 Protective earthing conductor
12 - 1.4.46 Reeling and trailing cable
12 - 1.4.47 Restrained plug and receptacle
12 - 1.4.48 Safe work method statement
12 - 1.4.49 Shunt release
12 - 1.4.50 Skilled persons
12 - 1.4.51 Substation
12 - 1.4.52 Switchgear
12 - 1.4.53 Transportable equipment
12 - 1.4.54 Undervoltage release
13 - 1.4.55 Working earths
13 - 1.5 APPLICABLE LEGISLATION
14 - SECTION 2 HAZARD IDENTIFICATION AND RISK ASSESSMENT
14 - 2.1 HAZARD ASSESSMENT
14 - 2.2 CONSULTATION
15 - SECTION 3 HV SAFETY MANAGEMENT PLAN
15 - 3.1 GENERAL
15 - 3.2 ELEMENTS
16 - SECTION 4 ELECTRICAL PROTECTION
16 - 4.1 STRATEGY
16 - 4.2 SECTIONALISING THE DISTRIBUTION SYSTEM
17 - 4.3 EARTH-CONTINUITY PROTECTION
17 - 4.4 EARTH-FAULT LIMITATION
21 - 4.5 EARTH-LEAKAGE PROTECTION
21 - 4.6 SHORT CIRCUIT
21 - 4.7 OVERCURRENT/OVERLOAD PROTECTION
21 - 4.7.1 Overcurrent protection
21 - 4.7.2 Overload protection
22 - 4.7.3 Current transformer (CT) considerations
22 - 4.8 EARTH-FAULT LOCKOUT
22 - 4.9 RESETS
22 - 4.10 MAINTENANCE AND TESTING OF PROTECTION DEVICES
23 - SECTION 5 HIGH VOLTAGE ISOLATION
23 - 5.1 ISOLATION AND SWITCHING DEVICES
23 - 5.1.1 General recommendations
23 - 5.1.2 Isolation devices for electrical work
24 - 5.1.3 Isolation for mechanical maintenance of equipment
25 - 5.1.4 Devices for emergency stopping
26 - 5.1.5 Devices for functional (control) switching
26 - 5.2 ISOLATION PRACTICES FOR ELECTRICAL WORK
26 - 5.2.1 Training and competency
26 - 5.2.2 HV access procedures-lockout and tagging
26 - 5.2.3 Operator protection
27 - 5.2.4 Environment for operating HV switch gear
27 - 5.2.5 Work crew protection
28 - SECTION 6 ENCLOSURES
28 - 6.1 ARC FAULT CONTAINMENT
28 - 6.1.1 Flameproof equipment
29 - 6.1.2 IP enclosures
29 - 6.2 CREEPAGE AND CLEARANCE
30 - 6.3 MINIMUM FREE DISTANCE
30 - 6.4 PERMITTED TECHNIQUES
30 - 6.5 IP CONSIDERATIONS
31 - SECTION 7 DISTRIBUTION AND CONTROL ARRANGEMENTS
31 - 7.1 GENERAL
31 - 7.2 MAIN DISCONNECTING SWITCH
31 - 7.3 TRAILING CABLE DISCONNECTING SWITCHES
31 - 7.4 DISCONNECTING SWITCHES
31 - 7.4.1 Rating
32 - 7.4.2 Visible break
32 - 7.4.3 Working earths
33 - 7.4.4 Provision for locking
33 - 7.4.5 Labelling
33 - 7.5 BARRIERS AND COVERS
33 - 7.6 COVER INTERLOCKS
33 - 7.7 EMERGENCY°STOP SWITCH
33 - 7.8 CAUTION LABELS
34 - SECTION 8 RETICULATION
34 - 8.1 INSTALLATION AND SAFEGUARDING OF CABLES
34 - 8.1.1 General
34 - 8.1.2 Feeder cables
35 - 8.1.3 Ring mains and parallel feeds
35 - 8.1.4 Multiple feeds
35 - 8.1.5 Trailing cables
37 - 8.1.6 Temporary storage of trailing cables
37 - 8.1.7 Safeguarding of cables
37 - 8.2 TRAILING CABLE HANDLING AND PULLING
37 - 8.2.1 Handling
37 - 8.2.2 Pulling
38 - 8.2.3 HV testing
40 - 8.2.4 Repair of cables
41 - SECTION 9 MOBILE MACHINES AND MOTORS
41 - 9.1 GENERAL
41 - 9.2 ELECTRICAL ENCLOSURES
41 - 9.3 MACHINE SWITCHING DEVICES
41 - 9.4 BARRIERS
41 - 9.5 ELECTRICAL INTERLOCKING
41 - 9.6 EMERGENCY SWITCHING
42 - 9.7 HV MACHINE CABLES
42 - 9.8 CABLE ANCHOR POINT
42 - 9.9 EARTHING
42 - 9.10 VARIABLE SPEED DRIVES (VSD)
42 - 9.10.1 General
42 - 9.10.2 Problems
43 - 9.10.3 Issues
43 - 9.10.4 Other considerations
44 - SECTION 10 TRANSPORTING HIGH VOLTAGE EQUIPMENT
44 - 10.1 GENERAL
44 - 10.2 CABLES
44 - 10.2.1 General
44 - 10.2.2 Paper insulated lead sheathed steel wire armoured (PILSSWA) cables
44 - 10.2.3 XLPE
44 - 10.2.4 Rubber cables to AS/NZS 1802
44 - 10.2.5 Installations, recovery and storage
48 - 10.3 OTHER HIGH VOLTAGE EQUIPMENT
49 - SECTION 11 COMMISSIONING PROCEDURES
49 - 11.1 GENERAL
49 - 11.2 FIRST TIME COMMISSIONING
49 - 11.3 RECOMMISSION/DECOMMISSION
51 - SECTION 12 OPERATING PROCEDURES SWITCHGEAR/EQUIPMENT
51 - 12.1 OPERATING PROCEDURES FOR OPERATORS OF HV MACHINES
52 - 12.2 OPERATING PROCEDURES FOR ELECTRICAL MAINTENANCE AND/OR REPAIR OF HV EQUIPMENT
54 - SECTION 13 INSPECTION AND MAINTENANCE
54 - 13.1 TROUBLESHOOTING AND TESTING
54 - 13.1.1 General
54 - 13.1.2 Trailing cable and mining machine electrical work procedures
55 - 13.1.3 Trailing cable troubleshooting and testing
55 - 13.1.4 DCB electrical work procedures
56 - 13.1.5 HV access procedures - lockout and tagging
56 - 13.2 MAINTENANCE OF HV SYSTEMS
56 - 13.2.1 General
56 - 13.2.2 Safety
57 - 13.2.3 Items to be considered
57 - 13.2.4 Trailing cable inspections
57 - 13.2.5 Maintenance on HV switchgear
57 - 13.2.6 Special considerations for SF6 switchgear
59 - APPENDIX A - TOUCH POTENTIAL CALCULATIONS FOR A HIGH VOLTAGE AFC
59 - A1 FACTORS AFFECTING TOUCH POTENTIAL
59 - A2 EXAMPLE
59 - A3 CALCULATION
61 - A4 CALCULATION FOR A BROADER RANGE OF VALUES
65 - APPENDIX B - PLANT STANDARDS
66 - APPENDIX C - USEFUL PUBLICATIONS
66 - C1 DESIGN & TESTING
66 - C2 APPLICATION
68 - APPENDIX D - EXAMPLES OF SAFETY ALERTS INVOLVING HV EQUIPMENT