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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
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For crossings of large bodies of water, wide freeways, or valleys, where the span width of the conductors is very long, specific constructions must be used to achieve a wider distance between the conductors, mostly to prevent short-circuits which may occur when conductors come in contact with one
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Branch pylons frequently, but not always, have one or more cross beams transverse to the direction of travel of the line for the admission of the branching electric circuits; some also have cross beams of the branching electric circuits lying in the direction of travel of the main line. Branch
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A branch pylon is used to start a line branch. The branch pylon is responsible for holding up both the main line and the start of the branch line. This makes a branch pylon also an anchor pylon since it must resist forces from both lines.
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as ordinary pylons. Longer wire sections thus reduce installation work and cost. Sequences of strainers are sometimes used at powerlines crossing valleys, or where the powerline runs a path with curves.
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Dead-end towers may be constructed of the same materials as other structures of the line. They may be steel or aluminum lattice structures, tubular steel, concrete, or wood poles.
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Since dead-end towers require more material and are heavier and costlier than suspension towers, it is uneconomic to build a line with only self-supporting structures.
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are operated from the ground by the use of long rods. The attachment of circuit breakers to pylons is only practical when voltages are less than 50 kV.
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which mostly just support the conductor weight and have relatively low capacity for unbalanced load. Dead-end towers may use
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between the two segments. Dead-end towers can resist unbalanced forces due to line weight and tension, contrasted with
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This straight line is made of strain towers to achieve low profile of the pylons and high clearance of the wires.
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Sequences of two or more strainer pylons are uncommon in a powerline because strainers require twice as many
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attachment of the conductors. They are often used when the power line must cross a large gap, such as a
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as a transition to a "slack span" entering the equipment, when the circuit changes to a
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another due to wind or other interferences. These towers may be built as
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pylons without additional cross beams are occasionally constructed.
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Standard
Handbook for Electrical Engineers Eleventh Edition
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at the end of conductors. Dead-end towers may be used at a
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Two termination towers and one cable branch tower nearby
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Termination tower (overhead line to underground cable)
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Dead-end towers are also employed at branch points as
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Structure used in construction of overhead power lines
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120:Learn how and when to remove this message
325:A special kind of a dead-end tower is a
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279:Loop-in of the branch, no through line
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496:Overhead power lines
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436:Transmission towers
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420:References
341:Long spans
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382:Sequences
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491:Pylons
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