Marlborough Lines Ltd Asset Management Plan March 2012 Issue A - draft Printed 28/03/2011 x:\engineering\asset management\2012\marlborough lines amp 2012 - issue a v3.docx Contents 1. Summary ....................................................................................... 1 1.1 Plan objectives & background ....................................................... 1 1.2 Details of assets ............................................................................. 1 1.3 Proposed service levels ................................................................. 2 1.4 Development and lifecycle plans ................................................... 2 1.5 Risk management .......................................................................... 3 1.6 Emergency Preparedness Plan .................................................... 4 1.7 Performance evaluation ................................................................. 4 2. Background and Objectives ....................................................... 6 2.1 Background .................................................................................... 6 2.2 Purpose of this AMP ...................................................................... 7 2.3 Planning Documents ..................................................................... 7 2.3.1 Vision ...................................................................................... 7 2.3.2 Mission .................................................................................... 8 2.4 Interaction between Planning Documents .................................... 9 2.5 Period Covered by the AMP ....................................................... 11 2.6 Stakeholders ............................................................................... 11 2.7 Managing conflicting interests .................................................... 17 2.8 Accountabilities for asset management ..................................... 17 2.8.1 Accountability at ownership level ........................................ 18 2.8.2 Accountability at governance level ..................................... 19 2.8.3 Board Reporting .................................................................. 19 2.8.4 Accountability at Chief Executive Level .............................. 19 2.8.5 Accountability at management level ................................... 19 2.8.6 Accountability at works implementation level ..................... 20 3. Asset Management Systems and processes ......................... 21 3.1 WASP – Asset and Works Management Software ................... 21 3.2 Key Information Locations .......................................................... 22 3.3 Databases ................................................................................... 23 3.4 Asset Inspection and Maintenance Scheduling ......................... 23 3.5 Network Development data support .......................................... 24 3.6 Performance Measurement for Disclosure ................................ 24 3.7 ISO system.................................................................................. 24 3.8 Network Standards ..................................................................... 25 4. Network Overview ...................................................................... 26 4.1 Background ................................................................................. 26 4.2 Load Characteristics ................................................................... 27 4.3 Supply Area Characteristics ....................................................... 28 4.3.1 Urban Areas ........................................................................ 28 4.3.2 Wairau Plains ...................................................................... 28 4.3.3 Inland Valleys ...................................................................... 28 4.3.4 Marlborough Sounds ........................................................... 28 4.3.5 East Coast ........................................................................... 30 5. Network Configuration .............................................................. 31 5.1 Overview ..................................................................................... 31 5.2 Transpower Point of Supply/Transmission Lines ...................... 31 5.3 Embedded Generation ............................................................... 32 5.4 Sub-transmission System ........................................................... 33 5.5 Zone Substations ........................................................................ 34 i 5.5.1 2011 Zone Substation loadings .......................................... 35 5.6 Distribution System ..................................................................... 35 5.7 Distribution Substations .............................................................. 36 5.8 Low Voltage Network .................................................................. 36 5.9 Ripple Control, SCADA and communications ........................... 36 6. Asset Descriptions..................................................................... 37 6.1 Major Asset Groups .................................................................... 37 6.2 Asset Lives .................................................................................. 38 6.3 Poles ........................................................................................... 38 6.4 Bulk Supply Points ...................................................................... 40 6.5 Sub-transmission Network ......................................................... 40 6.5.1 33kV Lines Overhead ......................................................... 40 6.5.2 33kV Underground .............................................................. 41 6.6 33/11kV Zone Substation Transformers .................................... 42 6.7 Distribution Network .................................................................... 46 6.7.1 11kV Overhead Lines ......................................................... 46 6.7.2 11kV SWER Lines ............................................................... 48 6.7.3 11kV Underground Cable ................................................... 48 6.8 Distribution Substations .............................................................. 49 6.9 Distribution Switchgear ............................................................... 50 6.9.1 Pole Mounted Circuit Breakers and Sectionalisers ............ 50 6.9.2 Oil Switches, Ring main Units ............................................. 51 6.9.3 Air Break Switches .............................................................. 51 6.9.4 Fault Locators ...................................................................... 51 6.10 Low Voltage Network .................................................................. 51 6.10.1 Distribution Boxes and Service Fuse Boxes ...................... 52 6.10.2 Fusing .................................................................................. 52 6.11 Ripple Injection ............................................................................ 52 6.12 Automation and Communication Assets .................................... 53 6.12.1 SCADA System ................................................................... 53 6.12.2 Voice Communication Equipment ...................................... 54 6.12.3 Phone-in devices ................................................................. 55 6.13 Metering ...................................................................................... 55 6.14 Power factor correction ............................................................... 55 6.15 Mobile substations/generators ................................................... 55 6.16 Control room ............................................................................... 56 6.17 Justification for Assets ................................................................ 56 7. Service Levels ............................................................................ 58 7.1 Introduction ................................................................................. 58 7.2 Customer Service levels ............................................................. 58 7.2.1 Key Targets ......................................................................... 58 7.2.2 Detailed Targets .................................................................. 59 7.2.3 Justification for targets ......................................................... 60 7.3 Asset Performance and Efficiency Targets ............................... 61 7.3.1 Justification for targets ......................................................... 62 7.4 Customer Survey ........................................................................ 62 7.4.1 Results ................................................................................. 62 7.4.2 Discussion ........................................................................... 62 7.6 Historic Service Levels ............................................................... 63 7.6.1 Key Service levels ............................................................... 63 ii 7.6.2 Detailed Service levels ........................................................ 63 7.6.3 System faults ....................................................................... 64 7.6.4 Planned outages ................................................................. 65 7.6.5 Efficiency Measures ............................................................ 67