Transposition tower
Type of electrical transmission tower
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.
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. Transposition helps to reduce the mutual coupling between conductors and between conductors and ground. It also useful in mitigating issues like induced voltages in nearby telephone lines.
Sources and credits
This article is adapted from the Wikipedia article “Transposition tower”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Elfmorgenbruch Verdrillmast.jpg by Ikar.us, CC BY 3.0 de
- Verdrillmast.jpg by TobiThiel, CC BY-SA 4.0
- Thüringer-Strombrücke-Mast102.jpg by Störfix, CC BY-SA 3.0 de
- Hoogspanningsmast ERD-EHVO-150-96.jpg by Alex P. Kok, CC BY-SA 4.0
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