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Hpc-9Dj-01-0002-2015 Distribution Design Rules Standard Number: HPC-9DJ-01-0002-2015 Document Control Author Anthony Seneviratne Standards Engineer Reviewed By Adrian Barnes Standards Engineer Danny O’Reilly Standards Engineer Document Owner Adrian Barnes (May also be the Process Owner) Senior Standards Engineer Endorsed By Dieter Mendoza Engineering Services Manager / Principal Engineer Approved By Marc Beckx Manager Engineering and Project Services Date Created/Last Updated April 2017 Review Frequency * 1 year Next Review Date April 2018 * Frequency period is dependent upon circumstances– maximum is 5 years from last issue, review, or revision whichever is the latest. If left blank, the default shall be 1 year unless otherwise specified. Revision Control Revision Date Description 0 24/04/2017 Initial Document Creation STAKEHOLDERS The following positions shall be consulted if an update or review is required: Asset Managers Strategic Asset Management Consultant Manager Health and Safety Field Practices Coordinator Senior Asset Frameworks Engineer Supply Chain Manager CS10# 4777319 HPC-9DJ-01-0002-2015 Page 2 of 100 Print Date 1/05/2017 © Horizon Power Corporation Uncontrolled document when printed or downloaded. Refer to CS10 or Horizon Power Website for current version. CONTENTS SUMMARY 1 GENERAL .................................................................................................. 13 2 OVERVIEW OF DISTRIBUTION SYSTEM ................................................ 15 3 DISTRIBUTION SYSTEM DESIGN AND CONSTRUCTION ..................... 16 4 OVERHEAD SYSTEM CORE COMPONENTS .......................................... 24 5 OVERHEAD EQUIPMENT ......................................................................... 29 6 UNDERGROUND SYSTEM CORE COMPONENTS .................................. 37 7 UNDERGROUND EQUIPMENT ................................................................. 41 8 MV METERING UNITS ............................................................................... 45 Appendix A REVISION INFORMATION (Informative) ..................................... 46 Appendix B GLOSSARY ................................................................................... 47 Appendix C EARTHING REQUIREMENTS ...................................................... 51 Appendix D DISTRIBUTION SYSTEM OVERVIEW .......................................... 54 Appendix E DADMD FOR TOWNS AND DIVERSITY FACTORS .................... 57 Appendix F OVERHEAD LINE DESIGN PRINCIPLES ........................................ 60 Appendix G UNDERGROUND CABLE DESIGN INFORMATION .................... 77 Appendix H LOCATION OF DISTRIBUTION COMPONENTS ......................... 82 Appendix I STREET LIGHTS .............................................................................. 91 Appendix J MAXIMUM SIZE OF TRANSFORMERS AND MAXIMUM SWITCHING LOADS FOR MICROGRIDS .............................................................. 94 Appendix K SWITCHING CAPABILITY OF OVERHEAD AND GROUND MOUNTED TYPE SWITCHING DEVICES ............................................................... 97 Appendix L EXTERNAL REFERENCE DOCUMENTS ...................................... 100 CS10# 4777319 HPC-9DJ-01-0002-2015 Page 3 of 100 Print Date 1/05/2017 © Horizon Power Corporation Uncontrolled document when printed or downloaded. Refer to CS10 or Horizon Power Website for current version. DETAILED TABLE OF CONTENTS 1 GENERAL .................................................................................................. 13 1.1 Purpose ................................................................................................................ 13 1.2 Scope ................................................................................................................... 13 1.3 Application ............................................................................................................ 13 1.3.1 Formal Safety Assessments (FSA) ....................................................................................... 13 1.4 Design Process and Inputs ................................................................................... 13 1.4.1 Network Requirements ......................................................................................................... 14 1.4.2 Planning ................................................................................................................................ 14 1.4.3 Equipment ............................................................................................................................. 14 2 OVERVIEW OF DISTRIBUTION SYSTEM ................................................ 15 3 DISTRIBUTION SYSTEM DESIGN AND CONSTRUCTION ..................... 16 3.1 MV Distribution System Planning .......................................................................... 16 3.1.1 Voltage Control ..................................................................................................................... 16 3.2 Loading of MV Distribution Feeders ...................................................................... 17 3.2.1 Interconnection of MV Feeders ............................................................................................. 17 3.2.1.1 Switching between Distribution Feeders and Feeder Spurs ................................................................ 17 3.2.2 Loading Capacity of MV Feeders ......................................................................................... 17 3.2.2.1 6.6 kV Feeders .................................................................................................................................... 17 3.2.2.2 11 kV Feeders ..................................................................................................................................... 18 3.2.2.3 22 kV Feeders ..................................................................................................................................... 18 3.2.2.4 33 kV Feeders ..................................................................................................................................... 19 3.2.2.5 Summary values ................................................................................................................................. 19 3.2.2.6 Single Phase MV Lines ....................................................................................................................... 20 3.2.3 Utilisation Criteria for Loading MV Feeders .......................................................................... 20 3.3 Low Voltage System ............................................................................................. 20 3.4 Distribution System Demand Assessment ............................................................ 21 3.5 Overhead Line Design .......................................................................................... 21 3.5.1 Line Security Levels and Wind Return Periods .................................................................... 21 3.6 Underground Cable Design .................................................................................. 22 3.7 Substation Design ................................................................................................ 22 3.8 Street Light Design ............................................................................................... 22 3.9 Earthing ................................................................................................................ 22 3.10 Safety Requirements ............................................................................................ 23 3.11 Land, Environment, Native Title and Heritage Requirements ................................ 23 3.12 Location of Distribution Components .................................................................... 23 CS10# 4777319 HPC-9DJ-01-0002-2015 Page 4 of 100 Print Date 1/05/2017 © Horizon Power Corporation Uncontrolled document when printed or downloaded. Refer to CS10 or Horizon Power Website for current version. 4 OVERHEAD SYSTEM CORE COMPONENTS .......................................... 24 4.1 Supports ............................................................................................................... 24 4.2 Stays .................................................................................................................... 24 4.3 Cross-arms ........................................................................................................... 25 4.3.1 MV Cross-arms ..................................................................................................................... 25 4.3.2 LV Cross-arms ...................................................................................................................... 25 4.4 Insulators .............................................................................................................. 25 4.5 Conductors ........................................................................................................... 25 4.5.1 Conductor Applications ......................................................................................................... 26 4.5.2 Conductor Attachments ........................................................................................................ 27 4.5.2.1 Conductor Ties to Insulators ............................................................................................................... 27 4.5.2.2 Conductor Terminations .....................................................................................................................
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