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  3. Transposition tower - Wikipedia
Transposition tower - Wikipedia
From Wikipedia, the free encyclopedia

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. This is important since it distributes electrical impedances between phases of a circuit over time, reducing the problem of one conductor carrying more current than others.

Karlsruhe transposition tower
Three-level Transposition tower
Top of a transposition tower
Transposition tower Of the 150kV line Eerde - Eindhoven Oost

Double-circuit lines are usually set up with conductors of the same phase placed opposite each other. For example, a section of a line may be (top-to-bottom) phases A-B-C on the left, also phases C'-B'-A' on the right. The next section may be B-C-A on the left, also A'-C'-B' on the right. Therefore, the rotation on each side of the tower will be opposite.[1] Transposition helps to reduce the mutual coupling between conductors and between conductors and ground.[2] It also useful in mitigating issues like induced voltages in nearby telephone lines.[3]

  • Here, on the right the phases are rotated; on the left, two phases are swapped, thus the rotation sense changed.
    Here, on the right the phases are rotated; on the left, two phases are swapped, thus the rotation sense changed.
  • Transposition tower. On the right side, the phases are rotated upward, on the left side downward.
    Transposition tower. On the right side, the phases are rotated upward, on the left side downward.
  • Transposition in the span field of a 420 kV-line in Sweden
    Transposition in the span field of a 420 kV-line in Sweden
  • Transposition on a single-phase line
    Transposition on a single-phase line
  • Transposition by using multiple towers
    Transposition by using multiple towers
  • Transposition by using elongated traverses
    Transposition by using elongated traverses
  • 154 kV double-circuit transposition tower.
    154 kV double-circuit transposition tower.

See also

Wikimedia Commons has media related to Transposition towers.
  1. ^ Technology, Electrical (2024-04-15). "Why are Conductor Positions Swapped in a Transposition Tower?". ELECTRICAL TECHNOLOGY. Retrieved 2024-08-23.
  2. ^ O Donovan, Michael; Barry, Noel; Connell, Joe; Cowhey, Eoin (2021-04-02). "Mutual Coupling Compensation Techniques Used for Distance Protection of Parallel Lines". Energies. 14 (7): 1982. doi:10.3390/en14071982. ISSN 1996-1073.
  3. ^ "Inductive Coordination | The Song of the Open Wire". Retrieved 2025-05-22.
Sunting pranala
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