power transmission tower — This small-footprint tower is used for voltages ranging from 110 to 315 kV. Its height ranges from 25 to 60 metres.
Circuits in a power transmission line are basically the no of feeder (on one side) that is being connected by a set of towers in a transmission line. Each circuits consists of conductor (bubdled or otherwise) in three different phases.
■ The difference between Single and Double Circuit Power transmission Towers
this two kind of power transmission towers can be designed and manufactured to support either one or two circuits of electrical current. Double circuit towers hold the different conductors stacked atop one another while in the single circuit towers the conductors are lined up horizontally.
■ Double circuit GMD and GMR in Power transmission tower
In high voltage transmission system you will often find transmission towers carrying two or more circuits. In fact numerous multi-circuit lines are already in use. Depending on which transmission tower types used, the conductors of circuits are arranged in different configuration. We will calculate inductance for a double circuit line using the formula.
■ transmission tower production process
As an BV ,ISO ,SGS approved supplier in China ,we have more than 20 years produce and export steel pole ,and we can assure the pole we offered is of sound quality which made from qualified material with our professional workers and advance equipment .
|Height||From 6 m to 15 m|
|Suit for||Airport ,seaport ,plaza, stadium , square, highway, street way etc|
|Shape||Conoid , Multi-pyramidal, Columniform,polygonal or conical|
|Material||Usually Q345B/A572,minimum yield strength>=345n/mm2
Q235B/A36,minimum yield strength>=235n/mm2
As well as Hot rolled coil from Q460 ,ASTM573 GR65, GR50 ,SS400, SS490, to ST52-
|Lamp power||20 W- 400 W (HPS/MH)
220V (+-10%) /50Hz
|Tolerance of the dimension||+- 2%|
|Optical assembly of lighting fixture||IP 65|
|Electroshock resistant protective grade||Grade Ⅰ|
|The casing anti-corrosion performance||Class Ⅱ|
|Working atmosphere of lighting fixture||-35 ℃~+45 ℃|
|Surface treatment||Hot dip galvanized Following ASTM A 123, color polyester power or any other standard by client
|Joint of Poles||Insert mode ,innerflange mode ,face to face joint mode .|
|Design of pole||Against earthquake of 8 grade|
|Wind Speed||160 Km/Hour|
|Minimum yield strength||355 mpa|
|Minimum ultimate tensile strength||490 mpa|
|Max ultimate tensile strength||620 mpa|
|Length of per section||Within 14m once forming without slip joint|
|Welding||We have past flaw testing. Internal and external double welding makes the welding beautiful in shape
Welding Standard :AWS ( American Welding Society ) D 1.1
|Thickness||1 mm to 30 mm|
|Production Process||Raw material test → Cutting →Molding or bending →Welding (longitudinal )→Dimension verify
→Flange welding →Hole drilling →Calibration → Deburr→Galvanization or powder coating ,painting
→Recalibration →Thread →Packages
|Packages||Our poles as normal cover by Mat or straw bale at the top and bottom ,anyway also can following by
client required , each 40HC or OT can loading
how many pcs will calculation base on the client actually specification and data.
|Style||Size and styles are variable as per customer request|