 |
|
Transmission towers support the high-voltage conductors of overhead power lines, from the generating station switchyard right up to the source substations and satellite substations located near populated areas.
|
| Crossings |
 |
Their shape, height and sturdiness (mechanical strength) depend on the stresses to which they are exposed. Towers do not transmit electricity themselves unless lightning strikes the ground wire strung along the top of the structure. This cable is designed to protect conductors by allowing lightning discharges to reach the ground through the tower.
This is the most common type of transmission tower. It's used for voltages ranging from 110 to 735 kV. Because they're easily assembled, these towers are suitable for power lines that cross very uneven terrain. |
|
 |
| |
|
| |
This small-footprint tower is used for voltages ranging from 110 to 315 kV. Its height ranges from 25 to 60 metres. |
|
 |
| |
|
| |
This tower is designed for voltages ranging from 230 to 735 kV. It's used mainly for power lines leaving the La Grande and Manic-Outardes hydroelectric complexes. The guyed-V tower is more economical than the double-circuit and waist-type towers. |
|
 |
| |
|
| |
Featuring a streamlined, aesthetic shape, this structure is less massive than other towers, allowing it to blend easily into the environment. For this reason, it's being used more and more in urban centres. Measuring between 27 and 45 metres in height, it's suitable for voltages ranging from 110 to 315 kV. |
|
 |
| |
|
| |
With its simple design, this tower is easy to assemble. It's used for the 735-kV conductors leaving the La Grande complex. This type of structure requires less galvanized steel than the guyed-V tower, making it lighter and less costly. |
|
 |
|
