Types of Electric Transmission Tower

Tower Types Power Transmission

Transmission towers and their overhead power lines are often considered to be a form of visual pollution. An Electrical Transmission tower is a tall structure, usually, a steel lattice tower used to support an overhead power line.

There are four major categories of transmission towers:
  • suspension, 
  • terminal, 
  • tension, and 
  • transposition. 
Some transmission towers combine these basic functions. They are used in high-voltage AC and DC systems and come in a wide variety of shapes and sizes.

Towe Types on the basis of Tower materials

1. WOODEN POLES
2. RCC POLES
3. STEEL TUBULAR POLES
4. STEEL TOWERS

Towe Types on the basis of line diversion


Type A Tower 
(Tangent Tower with suspension string)
Used on straight runs and up to 2° line diversion.

Type B Tower 
(Small Angle Tower with tension string)
Used for line deviation from 2° to 15°.

Type C Tower 
(Medium Angle Tower with tension string ).
Used for line deviation from 15° to 30°.

Type D Tower 
(Large angle tower with tension string)
Used for line deviation from 30° to 60°.

Type E Tower 
(Dead End Tower with tension string)
Used for line termination & starting.

Special tower-
Suspension Tower (Span ≈ 1000 m) 
Used for River crossing, Mountain crossing etc.

Transposition Tower


Towe Types on the basis of line current

  1. HVDC Tower
  2. HVAC Tower
Towers carrying AC circuits and DC electrode lines exist in a section of the powerline between Adolph Static Inverter Plant and Brookston the pylons carry the electrode line of HVDC Square Butte.

The overhead section of the electrode line of Pacific DC  Intertie from Sylmar Converter Station to the grounding  electrode in the Pacific Ocean near Will Rogers State  Beach is also installed on AC pylons


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