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High voltage and auxiliary cable design

High voltage and auxiliary cable design

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This chapter will examine characteristics of three types of electrical interconnection mediums that fall under the umbrella of cable design, which are as follows: 1. HV cable design This comprises the main interconnecting AC cables for power transmission and distribution, broadly covering the network voltages of 33 up to 400 kV - although 11 kV cables will be discussed where relevant. 2. Gas insulated transmission lines (GILs) Gas insulated transmission line (GIL) is included as part of this chapter since when installed, it generally serves as a replacement for HV cables. 3. Auxiliary cables Auxiliary cables refer to LV (i.e. low voltage) cables for interconnecting protection, control and telecommunications equipment and will include the following: (i) Multi-core cables (ii) Multi-pair cables (iii) Fibre optic cables.

Chapter Contents:

  • 7.1 Introduction
  • 7.2 HV cable design
  • 7.2.1 HV cables — considerations
  • 7.3 Cable historical development and types
  • 7.3.1 HV cable historical development
  • 7.3.1.1 Belted cables
  • 7.3.1.2 'H' and 'HSL' type solid cable
  • 7.3.1.3 Assisted cables
  • 7.3.1.4 XLPE cables
  • 7.3.2 Single-core vs three-core cable
  • 7.3.3 Summary of cable types and installations
  • 7.4 Cable technical characteristics
  • 7.4.1 Cable technical characteristics examined
  • 7.4.1.1 Conductor resistance and material
  • 7.4.1.2 Skin effect
  • 7.4.1.3 Proximity effect
  • 7.4.1.4 Cable inductance
  • 7.4.1.5 Cable capacitance
  • 7.4.1.6 Cable dielectric loss and loss angle
  • 7.4.1.7 Cable electromechanical forces
  • 7.4.1.8 Cable coefficient of thermal expansion
  • 7.4.1.9 Cable bending radius
  • 7.4.1.10 Cable tensile strength
  • 7.4.1.11 Cable laying lengths
  • 7.4.1.12 Cable laying depth
  • 7.4.2 Cable temperature monitoring
  • 7.5 Cable ratings
  • 7.5.1 Cable continuous current rating
  • 7.5.2 Cyclic rating
  • 7.5.3 Cable short-circuit current rating
  • 7.6 Cable laying mediums, formations and impressed voltages
  • 7.6.1 Types of cable laying mediums
  • 7.6.2 Single-core cable formations
  • 7.6.3 Impressed voltage
  • 7.7 Cable terminations and joints
  • 7.7.1 Terminations and joints — considerations
  • 7.7.2 Cable terminations
  • 7.7.3 Cable joints
  • 7.8 HV-cable type tests
  • 7.8.1 Cable type tests — requirements
  • 7.9 Cable specification, design and routing
  • 7.9.1 Cable specification — considerations
  • 7.9.2 Cable overall design and routing
  • 7.10 Gas insulated transmission line
  • 7.10.1 GIL background
  • 7.10.2 GIL construction
  • 7.10.3 GIL installations
  • 7.10.4 Advantages of GIL
  • 7.11 Auxiliary cables
  • 7.11.1 Auxiliary cable types
  • 7.11.1.1 Multi-core cables
  • 7.11.1.2 Multi-pair cable — PVC insulated
  • 7.11.1.3 Multi-pair cable — polythene insulated
  • 7.11.2 Fibre optic cables

Inspec keywords: gas insulated transmission lines; optical cables; power system interconnection; power cables

Other keywords: electrical interconnection mediums; telecommunication equipment interconnection; voltage 33 kV to 400 kV; protection equipment interconnection; voltage 11 kV; AC cables interconnecting; auxiliary cable design; power transmission; power distribution; high voltage cable design; fibre optic cables; control equipment interconnection; multicore cables; HV cable design; GIL; multipair cables; gas insulated transmission lines

Subjects: Insulation and insulating coatings; Power cables

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