ABSTRACT
Selecting suitable routes is particularly important for the design of overhead transmission facilities, so as to minimize disruptions due to operations and environmental conditions. The following issues are generally considered for route selection:
1. Matching with future planning for transmission network, substation allocation, and power supply 2. Accommodation for local and environmental conditions 3. Consideration of severe meteorological conditions like strong wind, snowstorm, and lightning 4. Difficulties for site acquisition 5. Safety and ease of construction and maintenance works 6. Reduction of construction costs and site acquisition 7. Adaptation of existing facilities and relevant construction works
Designing overhead transmission facilities includes the following items: (1) electrical conductor; (2) methods of insulating the conductor, such as insulators and porcelain bushings; (3) structures supporting the conductor, such as transmission towers; (4) foundations of the towers. General descriptions for supporting structures and their foundation designs are given in the following sections. An aseismic design concept will be given later.
