page_title: Dead-end tower
section_title: Termination pylon
hierarchical_section_title: Dead-end tower / Termination pylon
caption_attribution_description: Deutsch: In Bau befindlicher Endmast (Anlage 601 Mast 65, 110 kV) bei Altingen in Ammerbuch, während der Montage der Kabelendverschlüsse
context_page_description: A dead-end tower is a fully self-supporting structure used in construction of overhead power lines. A dead-end transmission tower uses horizontal strain insulators at the end of conductors. Dead-end towers may be used at a substation as a transition to a "slack span" entering the equipment, when the circuit changes to a buried cable, when a transmission line changes direction by more than a few degrees, or just once in a while to limit the extent of a catastrophic collapse.
  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.
  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. Dead-end towers can resist unbalanced forces due to line weight and tension, contrasted with suspension towers which mostly just support the conductor weight and have relatively low capacity for unbalanced load.
context_section_description: A special kind of a dead-end tower is a termination pylon. Also called a terminal tower. It is used when the overhead power line terminates, and is connected to substation equipment, or transitions to underground cable.
  For voltages below 30 kV also pylon transformers are used.
caption: Future termination tower of a 110 kV-line while joins are installed
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