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Intro
Message from the President
Message from the Chairman of the Technical Council of CIGRE
Message from the Secretary General
Preface
Contents
About the Editor
Contributors
1 Accessories in Underground Cable Systems and in Transitions from Overhead to Underground
1.1 Introduction to the Chapter
1.1.1 Background
1.1.2 Content of the Chapter
1.1.3 General Process
1.2 System Requirements and Basic Concepts
1.2.1 Basics on Transmission Network
1.2.1.1 Functions of the Network
1.2.1.2 Types of Substations

1.2.1.3 Main Cable Circuit Configurations
1.2.1.3.1 Meshed Underground Network
1.2.1.3.2 Siphon
1.2.1.3.3 Substation Entrance
1.2.1.3.4 Power Generator Output
1.2.1.3.5 Power or Auxiliary Transformer Supply
1.2.1.4 The Overhead to Underground Transition
1.2.1.5 System Requirements
1.2.2 Parameters Determined by the Network
1.2.2.1 Main Equipment Parameters
1.2.2.2 Fault Clearance Times
1.3 Design and Construction Issues Relating to Underground Section
1.3.1 Introduction
1.3.1.1 Electrical Characteristics
1.3.1.2 Thermal Dimensioning

1.3.1.3 Economical Optimization of Conductor Area
1.3.1.3.1 Short Circuit Characteristics
1.3.1.4 Main Insulation Coordination
1.3.1.5 Choice of Grounding Technique
1.3.1.6 Protection and Reclosure
1.3.1.7 Magnetic Fields
1.3.2 Methodology
1.4 Laying Techniques and Installation Methods
1.4.1 Laying Techniques
1.4.1.1 Trenches (Direct Burial)
1.4.1.2 Ducts
1.4.1.3 Troughs
1.4.1.4 Tunnels
1.4.1.5 Microtunnels
1.4.1.6 Shafts
1.4.1.7 Bridges
1.4.1.8 Mechanical Laying
1.4.1.9 Horizontal Drilling
1.4.1.10 Pipe Jacking
1.4.1.11 Embedding

1.4.1.12 Use of Existing Structures
1.4.2 Installation Techniques
1.5 Accessories Installation
1.5.1 Quality Assurance Approval for Installation
1.5.2 Quality Plan
1.5.3 Training of Personnel
1.5.4 Assembly Instructions
1.5.5 Special Assembly Tools
1.5.6 Preparation of the Assembly Environment
1.5.6.1 Joint Assembly
1.5.6.2 Termination Assembly
1.6 Design and Construction Issues Relating to Overhead to Underground Transition
1.6.1 Options for Transition Overhead/Underground
1.6.2 Transition on Towers/Poles
1.6.3 Transition Compounds

1.7 Transition Compound
1.7.1 Planning
1.7.1.1 Extent of the Transition Compound
1.7.1.2 Connection Scheme
1.7.1.2.1 Operational Flexibility
1.7.1.2.2 Reliability and Availability
1.7.1.2.3 Service Continuity
1.7.1.2.4 Choice of Connection Arrangements
1.7.1.3 Fault Current Levels
1.7.1.4 Neutral Point Earthing
1.7.1.5 Protection in General
1.7.2 Site Selection
1.7.2.1 General
1.7.2.2 Environmental Aspects
1.7.2.2.1 Land
1.7.2.2.2 Water
1.7.2.2.3 Vegetation
1.7.2.2.4 Fauna
1.7.2.2.5 Population and Economy
1.7.2.2.6 Town Planning

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