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 .
Figure 6 Diagram of a Typical Transmission Riser Structure Transition Stations High voltage (345 kV or greater) underground transmission lines require transition stations wherever the underground cable connects to overhead transmission. For very lengthy sections of underground transmission, intermediate transition stations might be necessary.
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