Transcription of Underground Electric Transmission Lines
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Underground Electric Transmission Lines
1 UUUnnndddeeerrrgggrrrooouuunnnddd EEEllleeeccctttrrriiiccc TTTrrraaannnsssmmmiiissssssiiiooonnn LLLiiinnneeesss Introduction This overview contains information about Electric Transmission Lines which are installed Underground , rather than overhead on poles or towers. Underground cables have different technical requirements than overhead Lines and have different environmental impacts. Due to their different physical, environmental, and construction needs, Underground Transmission generally costs more and may be more complicated to construct than overhead Lines . Issues discussed in this pamphlet include: Types of Underground Electric Transmission Cables Ancillary Facilities Construction and Operation Considerations Costs Repairs The design and construction of Underground Transmission Lines differ from overhead Lines because of two significant technical challenges that need to be overcome.
7 Lightning arrestors are placed close to where the underground cable connects to the overhead line to protect the underground cable from nearby lightning strikes. The insulating material is very sensitive to large voltage changes and cannot be repaired. If …
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