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.
Underground XLPE cables left to right: 345 kV, 138 kV, 69 kV, and distribution Each transmission line requires three separate cables, similar to the three conductors required for aboveground transmission lines. They are not housed together in a pipe, but are set in concrete ducts or buried side-by-side.
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