This guide presents factors to be considered in the planning, design, and installation of transition facilities between overhead and underground transmission lines. These include the system implications of a hybrid installation as they relate to the transition facility. While this document focuses on transmission lines, some of the considerations listed in this guide are common to transmission, distribution, and substation installations.
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C23W/P1793_WG - Guide for Planning and Designing Transition Facilities between Overhead and Underground Transmission Lines
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IEEE Guide for Planning and Designing Transition Facilities between Overhead and Underground Transmission Lines
Careful consideration of the physical and electrical characteristics of overhead lines and transmission cables are necessary in designing a transition structure between the two systems. Environmental and social factors also play a role in designing a transition. By considering the factors contained in this guide, the user will be better able to design a suitable transition that balances cost, operability, environmental factors, and future flexibility.