Megatro 230kv DC Tangent Overhead Transmission Line Tubular Steel Pole

July 19, 2023

Model NO.: MGP-230KV-TO
Structure: According to Client′s Technical Specification
Design Software: Pls
Accessories 1: Power Fitting
Accessories 2: Conductor and Cable
Accessories 3: Insulator
Accessories 4: Earth Wire and Opgw
Accessories 5: Tower Foundation
Accessories 6: Anchor Bolts and Template
Accessories 7: Lighting Rod and Earthing Kits
Accessories 8: Aviation Light
Accessories 9: Other Sevice as Per Client
Trademark: MEGATRO
Transport Package: Export Standard Package
Specification: As per clients
Origin: Shandong, China
HS Code: 73082000
Model NO.: MGP-230KV-TO
Structure: According to Client′s Technical Specification
Design Software: Pls
Accessories 1: Power Fitting
Accessories 2: Conductor and Cable
Accessories 3: Insulator
Accessories 4: Earth Wire and Opgw
Accessories 5: Tower Foundation
Accessories 6: Anchor Bolts and Template
Accessories 7: Lighting Rod and Earthing Kits
Accessories 8: Aviation Light
Accessories 9: Other Sevice as Per Client
Trademark: MEGATRO
Transport Package: Export Standard Package
Specification: As per clients
Origin: Shandong, China
HS Code: 73082000
MEGATRO 230kV DC tangent overhead transmission line tubular steel pole
This photo refers to our 230kV DC tangent overhead transmission line tubular steel pole, SLATT TO RING BUS 230-KV

This line segment interconnects 1479-MW of wind energy from the project's 230-kV Ring-Bus Switching station to the BPA Slatt Substation. Planned for four substations, this will be the world's largest wind farm. TriAxis designed the 4-mile-long 230-kV double-circuit overhead transmission line with twin-bundle, 1590 kcmil Falcon ACSR. The line consists of single, tubular-steel poles and conductors are supported from I-String polymer insulators on steel davit arms. The average span length is approximately 800 feet. All structures are direct-embed and self-supporting, and all large angles and deadends are two-pole structures.

PLS-CADD was used in all aspects of line design including the development of structure models, the evaluation of strength and clearance requirements, and production of plan and profile drawings. TriAxis services included all specifications, bid documents preparation, and services during the construction

MEGATRO 230kV DC tangent overhead transmission line tubular steel pole is a tower with two columns to support the wire and overhead ground wire, which is often used in the case of double overhead ground wire and wire arranged horizontally. It is generally used for transmission lines with a voltage level of 220kV or above, which can be used to improve the stability of the tower, and the column sometimes has a certain slope. The utility of this kind of pole tower is relatively large, and it has a good economic index when the cable is drawn.
MEGATRO provide typical design for 230kV DC tangent overhead transmission line tubular steel pole which used in African power transmission line project, since year 2010, we had been mail supplier for Nigeria PHCN, and NGCP. This monopole has some type such as terminal, transposition and tension tower.
SPECIFICATION
Tower 230kV DC tangent overhead transmission line tubular steel pole
(a)  Type of Tower -     Hot dip galvanized Steel,Lattice Tower
        Horizontal phase configuration Twin Bundle
(b)  Foundation -     Reinforced concrete foundation on stub angle
(c ) Center to center distance -     (F,H,J) (8.5 m, 5 m, 5 m)
(d)  Tower height -     15 m,21 m,23 m
      (Vertical distance between the lowest boom of cross-arm and the top of  
        concrete foundation)  
(e)  Steel -     St-38,St-52 according to DIN 18100
(f)  Bolts -     St-3.6 or St-5.5 according to DIN 268
(g)  Welding -     Shall be electric arc, according to DIN 3100
(h)  Minimum thickness of web member -     5 mm
       and nominal member  
(i)  Minimum thickness of Gussets -     8 mm
(j)  Minimum thickness of stub member -     5 mm
(k)  Minimum width of Angle Iron -     35 mm
(l)  Minimum distance from -     According to UDE 021015.68 = 25d
     centre of bolt holes to the       ( d = diameter of hole)
     edge of any steel section  
  1. Design Temperater and wind data
Mainly Meteorological Data
Design Meteorological Temperature (ËšC) Wind Velocity (m/s)
Conditions
Max.Ambient Temperature 35   0  
Everyday Temperature 28   0  
Min. Temperature 10   0  
Max. wind -   35 at 28˚C  
Installing Condition 25   10  
Max. Conductor Temperature 85   0  


Before fabrication, our engineer design and modified many times with owner engineer for final confirmation, this type of tower has some advantage:
Thinner thickness: 6-8mm
Less weight: 10 tons
Height: 32M, even higher
We design then with DAO POWER software, and can meet clients requirements. After fabrication all monopole are delivered to the galvanizing facility to be Hot DIP Galvanized. Towers are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free towers.
MEGATRO's door type monopole can accommodate a variety of cross-arm. MEGATRO also offers a wide variety of accessories and mounts.
Workshop size: Based on the customer's requirements.
Material: Chinese material or as per clients requirement
Package: Both parties discuss before delivery
Terms of Payment: L/C, T/T
Minimum Order Quantity: 1 set
Port of Loading: Qingdao Port
Lead Time: One month or based on the customer's needs
Performance Standard
Besides conform to the drawing and design, the materials and fabrication of tower components shall
We also adopt British, American and other international standard which client can accept.
it is widely used in our Chinese market. Some of technical features of this tower as follow:
X
  1. Type and specification for OPGW insulator and conductor
Type ACSR Conductor         
(605 MCM, Duck)		 Earth Wire                  
(GJ-50)		  
 
Structure (no./mm) Aluminum 53/2.68    
  Steel 8/2.68 18/1.8  
Outside Diameter   23.21 8  
Sectional Area (mm2) Aluminum 306.9    
  Steel 39.89 50  
Overall Section Area (mm2) 335.59 50  
Unit Weight (kg/km) 1.159 0.383  
Ultimate Strength (kN) 101.5 59  
Comprehensive Elastic Factor (N/mm2) 80000 181300  
Comprehensive Expansion Factor (1/C x 10E -5) 19.3 11.5  
20˚C Direct Current Resistance 0.09323    
Breaking Stress (N/mm2) 288 1180  
Actual Max. Stress (N/mm2) 105 288  
Everyday Operation Stress (N/mm2) 51 190  
Normalization CSA-C39-1955 GB1200-88  
 
  1. Design date
 
Type XP-120
Height (mm) 135
Disc diameter (mm) 253
Leakage distance (mm) 320
Marking of connection 15 mmA
Nominal electro-mechanical failing load (kN) 120
Withstand voltage (kV) Power Frequency Dry 80
Wet 30
Lighting impulse 110
Power frequency breakdown voltage (kV) 110
  1. LOADING DATA
The following broken wire condition shall be taken on the design of towers.  
Single Circuit Tower  
   
   
(i)Suspension Tower :   Any one phase conductor (twin
      bundle) or one ground wire
      Broken at either side of the tower;
(ii)Tension Tower :   Any one phase conductor (twin
      bundle) and one ground wire
      (or) Any Two phase conductor
      Broken at either side of the tower;
Factor of safety for loading  
Suspension Tower Tension Tower  
2.0 2.0  
1.5 1.5  
Maximum slenderness ratio  
     (a) Tower legs,main compression members 150
          in cross arms and earth wire peaks  
     (b) Other compression members carrying 200
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