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.
percent of the transmission system in Wisconsin is constructed underground. All underground transmission lines are 138 kV lines or less. There are no 345 kV lines constructed underground, currently in Wisconsin. Types of Underground Electric Transmission Cables There are two main types of underground transmission lines currently in use. One type is
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