Transcription of Undergrounding high voltage electricity transmission lines
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Undergrounding high voltage electricity transmission lines
Undergrounding high voltage electricity transmission linesThe technical issuesContents Introduction 03 National Grid electricity transmission 03 an overview Section1 Insulating underground cables 042 Capital costs for installation of 05 underground cables3 Underground cable technologies 064 Planning and environmental issues for 08 underground cables5 Land use restrictions over cable routes 096 Operation, maintenance, refurbishment 10 and up-rating cables7 Cable installation methods 11 Direct buried cables 11 Direct buried cable installation 12 Ducted method 13 Surface troughs 13 Deep bore tunnels 14 Cut and cover tunnels 158 Components of underground 16 cable systems Cable sealing end compounds 16 Joint bays 16 Stop joints 17 Water cooling 17 Reactive compensation 179 Electric and Magnetic Fields (EMFs) 18 from underground cablesFront cover photo: National Grid works with Arup to deliver London Power TunnelsIntroductionNational Grid owns the high voltage electricity transmission system in England and Wales and operates the system throughout Great Britain at 275,000 and 400,000 volts (275kV and 400kV).
Cement-bound sand The conductor is much thicker than for an Tough plastic overhead cable cover protects against corrosion Aluminium or lead sheath to retain insulating fluid The conductor is insulated by a thick wrapping of fluid-impregnated paper. The fluid is kept under pressure by fluid tanks along the cable route Page 04
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