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AECOMPuketoi Wind Farm Technical ReportTable of ContentsExecutive Summaryiii1.0 Introduction 11.1 Scope of Investigation 22.0 Overhead Lines 22.1 Line Route Selection 22.1.1 Line Design Methodology 32.2 Line Modelling 32.2.1 Survey Data 32.2.2 Conductor Modelling 32.3 Line Loading 32.3.1 Maximum Wind 32.3.2 Snow & Ice 42.3.3 Conductor Temperatures 42.4 Clearances 42.4.1 Crossings 42.5 Conductor Selection 52.5.1 220kV OHL 52.5.2 33kV OHL 52.5.3 Conductor Tensions 62.6 Insulators and Hardware 62.7 Structure Selection 62.7.1 220kV OHL Structures 62.7.2 33kV OHL Structures 62.8 Structural Analysis 72.9 Foundations 73.0 Collection System 73.1 General 73.2 Unit Sub Station 73.2.1 Step Up Transformer 83.2.2 33 kV RMU 83.2.3 Low Voltage Cabling 83.3 33kV Collection Circuits 83.3.1 Cable Trenches 83.3.2 33 kV Cables 84.0 220/33 kV Substation 94.6 Oil Drainage and Interception System 124.6.1 Description 124.6.2 Oil Volume and Stormwater Criteria 124.6.3 Operation 124.6.4 Transformer Bund Area & Wall Height 124.6.5 Discharge 135.0 Earthing System 135.1 Overview 135.2 Summary 135.3 Soil Resistivity Test and Modelling 145.4 Earth Fault Levels & Clearance Times 145.5 Structure Earth Grid Resistances 145.6 Substation Earth Grid Resistance 145.7 Calculations 146.0 Electromagnetic Field Strength (EMF) 157.0 Preliminary Constructability Review 167.1 Planning and Materials 167.2 Vegetation Management 167.3 Access 167.4 Construction 1727 July 2011
AECOMPuketoi Wind Farm Technical Report7.4.1 Road or Rail Protection 177.4.2 Reinstatement 177.4.3 Line Maintenance 178.0 Conclusion & Recommendations 18List of Figures and TablesList of FiguresFigure 1 Proposed Wind Farm Site 1Figure 2 Unit Sub Station Schematic 8Figure 3 Electric field strength of the 220kV transmission line 15Figure 4 Magnetic flux density of the 220kV and 33kV lines. 16List of TablesTable 1 Line Characteristics 3Table 2 Conductor Temperatures 4Table 3 OHL Conductor Clearances 4Table 4 33kV OHL Existing Crossing Details 5Table 5 220kV OHL Existing crossing Details 5Table 6 Typical Soil Resistivity Profile derived for Puketoi area 14Table 7 Worst case future bus earth fault levels 1427 July 2011
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