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Transmission tower in Toronto, ON Single-circuit three-phase transmission line Transmission towers on a hill field. Three-phase electric power systems are used for high voltage (66- or 69-kV and above) and extra-high voltage (110- or 115-kV and above; most often 138- or 230-kV and above in contemporary systems) AC transmission lines.
A tower testing station is a special plant for testing various design for towers for transmission lines and similar uses. A tower testing station consists of two steel stands and one or more foundations, on which a sample of the tower can be built.
In electrical power transmission, a transposition tower is a transmission tower that changes the relative physical positions of the conductors of a transmission line in a Polyphase system. A transposition tower allows these sections to be connected together, while maintaining adequate clearance for the conductors.
Star Tower, example of a Landmark tower Moscow Octod Tower, example of a Hyperboloid lattice tower Zhuzhou Television Tower, example of a lattice tower with a solid core, nearly a dozen of which were built in China throughout the 90's Sutro Tower, a well-known San Francisco landmark featuring an uncommon 3-legged design Wavre Transmitter ...
Hyperboloid electricity pylon towers 128 m (420 ft) Vladimir Shukhov: The Shukhov Tower on the Oka River is the world's only diagrid hyperboloid electricity pylon transmission tower. In 2009 one tower was illegally taken down to re-sell the metal. Dorton Arena: 1952 Raleigh, North Carolina United States: Hyperbolic paraboloid saddle roof on arena
A large transmission line project may have several types of towers, with "tangent" ("suspension" or "line" towers, UK) towers intended for most positions and more heavily constructed towers used for turning the line through an angle, dead-ending (terminating) a line, or for important river or road crossings.
Like Western Area Power Administration's 500 kV line, the tower design for the entire transmission system is not the same, although the difference is not as dramatic as on the WAPA line. For the PG&E line, the differences are subtle and from a casual, far away view, it looks like the towers are all the same for the entire power line.
Dead-end towers are used at regular intervals in a long transmission line to limit the cascading tower failures that might occur after a conductor failure. An in-line dead-end tower will have two sets of strain insulators supporting the lines in either direction, with the lines connected by a jumper between the two segments.