An electricity pylon or transmission tower is a tall structure, usually a steel lattice tower, used to support overhead electricity conductors for electric power transmission. They are used in high voltage AC and DC systems as well as railway traction, and come in a wide variety of shapes and sizes. Transmission Tower structures can be classified by the way in which they support the line conductors. Suspension structures support the conductor vertically using suspension insulators.. Strain structures resist net tension in the conductors and the conductors attach to the structure through strain insulators. Dead-end structures support the full weight of the conductor and also all the tension in it, and also use strain insulators. Where the power transmission line must change direction, then angle towers are used. Structures are classified as angle suspension, angle strain, and angle dead-end.
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