Why are electrical pylons different shapes and sizes? - different shapes of viginas
Does anyone know why towers in many different shapes, sizes and heights can be seen? Thank you!
Saturday, February 6, 2010
Different Shapes Of Viginas Why Are Electrical Pylons Different Shapes And Sizes?
Subscribe to:
Post Comments (Atom)
2 comments:
The design of the tower taken into account:
- Number of circuits
- Voltage of each circuit
- Size of the driver and the voltages
- Inch lengths
- Vertical space
- According to the angle or the load on the structure of the corner
- The worst weather conditions (snow, wind, etc.)
Number of channels: Many towers have more than one control circuit. In general, each circuit of three thick cables are together. In some regions, a tower may have four or more circuits.
Tension: Some of the common transmission voltages in the United States is at 138 kV, 230 kV, 345 kV, 500 kV and 765 kV. I know the structures that carry a double circuit 345 kV and two 138-kV lines. The higher the voltage, the higher the removal requirements of the structure of the tower, other cable and ground. At 345 kV, is an insulator string length of more than 10 meters.
Size of the conductors and includes: the transfer of most of the drivers are made of aluminum alloy or aluminum with steel reinforcing wire placed in the middle. It is not uncommon for these drivers in more than two inchesis the diameter.
Spans typically range from 500 to over 1300 ". I know that some lines of 345 kV as 1320" that the line crosses farmland. Covers can be much more if they have to cross a river Gourge etc. Given the driver's weight and widths are tensions in the tens of thousands of pounds.
Caliber: The game needs more agricultural land less than the required distance on the streets. In many cases, the limiting factor in the ability of a number of transmission line is, by Regulation, as the pipe is not heated, and additional wells.
Masts Structures are tangent. Every nook or corner office has more structure and should be designed. Reputation in dozens of thousands of pounds for the driver, even slightly designs for reinforced corners Pol. Pole angle of 90 degrees has some of the biggest burden. But Guy's son will reduce stress, a self-supporting tower must be carefully designed to withstand enormous forces.
The worst conditions:The way to design a driver in the static calculations, a structure of the tower ... The engineer must also consider the worst conditions in this area. Given the structure height, which often designed for wind speeds over 100 MPH.
In areas with snow and ice should also be designed for the freezing rain conditions that allow the accumulation of ice on the building and cabling. A 2 "diameter wire can cause an area of 4" in diameter with the accumulation of ice. Most causes strucuture additional burden if the wind blows. Not to mention the extra weight of all the ice.
Contain safety: To all the above conditions, a safety engineer "on the design," the tower of the worst conditions. The typical factors of safety could be 2.5 times the worst to 4x conditions.
Pilon costs: In the simplest sense, the pylons are charged "per pound." The largest and heaviest of the structure will cost more to manufacture and assembly. For a given projectionIf the engineer must take into account all these factors and to achieve a safe and reliable.
Conclusion: After all is said and done and the engineer has to optimize the design of the pipes and get from point A to point B, with towers and pilots less. The longer tours are much cheaper than lines with many curves as strucuture tangent is much cheaper than building corner.
Circles, squares, nothing!
Post a Comment