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Glade Spring, Virginia was struck by an F3 tornado on April 28, 2011. Winds were reported at 140 mph. There was loss of life. American Electric Power (AEP) Company's Broadford -Sullivan 500 kV extra high voltage (EHV) transmission line was severely damaged along a five-mile section. The damage was unusually extensive as the tornado followed the transmission line corridor for many miles. The project repairs tallied sixteen 500 kV lattice tower replacements with sixty-four newly drilled reinforced concrete foundations. The new foundations were designed and constructed using predesigned foundations with nomographs to establish sitespecific foundation depths during installation based on as-drilled subsurface conditions. Seven tower repairs were also performed. Approximately five circuit miles of two-bundled Aluminum Conductor, Aluminum-Alloy Reinforced (ACAR) conductor were replaced. The line was placed into service on July 21, 2011. This was an 85 day outage with service re-established 57 days ahead of schedule. This paper summarizes the team effort to assess damage, investigate alternatives, develop a restoration plan, and design and construct replacement facilities for an extensively damaged EHV line. It focuses on tower repair, tower replacement, foundation design, and foundation installation with an emphasis upon the factors that benefited the final in-service date. These factors include the impact of the crucial assistance from FirstEnergy in furnishing the 16 lattice replacement towers, the nomograph method of foundation design and installation, and the field instrumentation and equipment utilized to install the foundations. ELECTRICAL TRANSMISSION AND SUBSTATION STRUCTURES 2012

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Lattice towers are the most commonly used medium for transferring electricity in the transmission network across our country. Whereas Tubular Poles are the most commonly used medium for transferring electricity in the transmission network in the developing countries. This project is a comparative study between the conventional lattice tower and the tubular pole for 765kV double circuit medium deviation angle tower with the exception of foundation design. The conventional lattice tower and the tubular pole are modelled and analyzed in STAAD PRO software. The maximum deflections and the weight of the towers are compared and conclusions are drawn in order to determine the advantages and disadvantages of both types of transmission towers.