A Twisting pylon is an anchor pylon, at which the phases of an electric circuit on the pylon change their place (twisting). Twisting of overhead lines takes place according to a pattern, the twisting pattern.
A picture of a twisting pylon (http://www.structurae.de/files/photos/1803/c3_vd1.jpg)
The towers are usually steel lattices or truss es (wooden structures are used in Germany in exceptional cases) and the insulators are generally glass discs assembled in strings whose length is dependent on the line voltage and environmental conditions.
Pylons used for single phase AC railway traction lines are similar in construction to pylons used for 110 kV-three phase lines.
Twistingpylon s are anchor pylons at which the conductors are "twisted" so that they exchange sides of the pylon.
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