Welcom to QINGDAO MEGATRO HOLDING CO.,LIMITED
500KV power transmission line also belongs to Extra-high voltage power transmission project. With development of China power grid and technology, extra voltage like 500KV is widely used in power transmission and distribution line.
500KV transmission line carries double or multi-circuits conductors. For a three-phase system, this implies that each tower supports three conductors. Three-phase electric power systems are used for high voltage (66KV or 69kV and above) and extra-high voltage AC transmission lines. The towers must be designed to carry three (or multiples) conductors. The towers are usually steel lattices or trusses, both tubular and lattice steel towers can be designed so as to support single-circuit or multi-circuits of electrical current.
MEGATRO provide the 500KV DC tension tower for our esteemed clients. The Tower Line work involves Survey, check survey, and span calculations essential for tower extensions. Moreover, Tower designs and prototype approval is done. In material choice, the steel material must be high tensile with strength, solid, wind resistance well. In general, we adopt more ASTM A572 GR50, GR65, ST52, S355J0, S355JR, Fe510, Q420, Q460, and equivalent materials.
MEGATRO is one of the few manufactures who assemble a face of 500KV DC tension tower. This attention to quality may not be the cheapest process but it does insure every tower meets our high standards of quality. And it helps to reduce on-site construction cost due to mismatched assemblies.
After fabrication all 500KV DC tension tower 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' 500KV DC tension tower systems can accommodate a variety of cross-arm. MEGATRO also offers a wide variety of accessories and mounts.
Availability 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
APPLICABLE STANDARD AND CODES
All towers manufactured and design shall be generally in accordance with latest revision of the following standards except where specifically directed otherwise.
General
IEC 60826 - Design criteria of overhead lines
IEC 60652 - Loading tests on overhead line structures
ISO 1459 - Metallic coatings - Protection against corrosion by Hot Dip Galvanizing
ISO 1461 - Hot dip galvanized coatings on fabricated iron and steel articles
ISO 12944 - Paint coatings, corrosion protection, and structural steelwork
ISO 898-1 - Mechanical properties of fasteners. Part 1-Bolts, Screws and studs
ISO 630 - Structural Steels - plates, wide flats, bars, sections and profiles
ISO 657 - Hot rolled structural steel plates tolerances on dimensions and shape
ISO 7411 - Hexagon Bolts for high strength structural bolting with large width across flats
ISO 657-5 - Hot rolled Structural Steel Sections equal and unequal leg angles
ISO 7452 - Hot rolled structural steel plates tolerances on dimensions and shape
BS EN 50341-1 -Overhead electrical lines exceeding AC 45kV -General Requirements
BS 8004 - Code of Practice for Foundations
BS 8110 - Structural use of concrete
ANSI10-97 - Design of latticed steel transmission structures
IEC 60050 (151) International Electro-technical Vocabulary
Part 51 Electrical and Magnetic Devices
IEC 60050 (601) Chapter 601: Generation, transmission and distribution of electricity-General
IEC 60050 (601) Chapter 601: Generation, transmission and distribution of electricity-Operation
IEC 60059 IEC standard current ratings
Chinese Standard
| No | Code | DESCRIPTION |
| 1 | GB/T2694-2003 | Power Transmission line Steel tower - Technical requirements for manufacturing |
| 2 | JGJ81-2002 | Technical specification for welding for steel structure of building |
| 3 | GB9787-88 | Measuring and allowable tolerance for hot-rolled equal angle |
| 4 | GB709-88 | Measuring and allowable tolerance for hot-rolled plate and strip |
| 5 | GB/T699-1999 | Quality Carbon Structural Steel |
| 6 | GB/T1591-1994 | Low alloy high strength structural Steel |
| 7 | GB700-88 | Carbon Structural Steel |
| 8 | GB222-84 | Method of sampling steel for determination of chemical composition and permissible variations |
| 9 | GB/T228-2002 | Method for Tensile testing of metals |
| 10 | GB/T232-1999 | Method for Bending test of metals |
| 11 | GB/T5117-1995 | Carbon Welding Rod |
| 12 | GB/T5118-1995 | Low Alloy Welding Rod |
| 13 | GB/T8110-1995 | Welding wires for gas shielding arc welding of carbon and low alloy steels |
| 14 | GB/T10045-2001 | Carbon steel flux cored electrodes for arc welding |
| 15 | JB/T7949-1999 | Weld outer dimensions for steel construction |
| 16 | GB50205-2001 | Test Standard for Acceptance of Steel Structure |
| 17 | GB/T470-1997 | Zinc Ingot |
| 18 | GB3098.1-2000 | Mechanical properties of fasteners-Part 1:Bolts, screws and studs |
| 19 | GB3098.2-2000 | Mechanical properties of fasteners-Part2: Nuts, and thread |
| 20 | GB3098.3-2000 | Mechanical properties of fasteners-Part3: Fastening screw |
| 21 | GB/T5780-2000 | Helical Bolts Grade C |
| 22 | GB/T41-2000 | Helical Nuts Grade C |
| 23 | GB/T90-2002 | Flat Washer Grade C |
| 24 | GB/T13912-2002 | Metal Coating, Technical Requirement and Test Method for Hot-dip galvanized Metal Parts |
American Standards:
| Standard | Description |
| ASTM A6/A6M | Standard specification for general requirements for rolled structural steel bars, plates, and sheet piling. |
| ASTM - 6 | - General Requirements for delivery of Rolled Steel Plates, Shapes, sheet Piling Bars for structural used |
| ASTM A36/A36-M-97a | Standard specification for Carbon structural steel |
| ASTM A123 / A123M-02 | Standard specification for Zinc (Hot-Dip Galvanized) Coatings on iron and steel products |
| ASTM A143 / A143M-03 | Standard Practise for Safeguarding Against Embitterment of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embitterment |
| ASTM A153/ A153M-05 | Standard specification for zinc coating (Hot-Dip) on iron and steel hardware |
| ASTM A - 194 | - Grade for bolt |
| ASTM A239 | Standard practice for locating the thinnest spot in a zinc (Galvanized) Coating on Iron or Steel Articles |
| ASTM A242 | Standard specification for High-Strength Low-Alloy Structural steel |
| ASTM A307 | Standard Specification for Carbon Steel Bolts and Studs, 60000 PSI Tensile strength |
| ASTM A370-06 | Standard Test Methods and Definitions for Mechanical Testing of Steel Products |
| ASTM A325 | Standard Specification for structural bolts, steel, Heat treated 120/105 ksi minimum tensile strength |
| ASTM A-325 or A-354 | - Galvanized hexagonal head of connection bolt |
| ASTM A325-97 | Standard Specification for High-strength Bolts for structural steel Joints |
| ASTM A384 / A384M-02 | Standard Practise for Safeguarding Against Warpage and Distortion During Hot-Dip Galvanizing of Steel Assemblies. |
| ASTM A394-93 | Standard Specification for steel Transmission Tower, Bolts, Zinc Coated and Bare |
| ASTMA - 563 | - Class and size of nuts |
| ASTMA - 572 | - Chemical composition of steel |
| ASTM A572/A572-97c | Standard specification for High-Strength Low-Alloy Columbium-Vanadium Structural steel |
| ASTMA - 615 | - The anchor bolt material |
| ASTM A673 / A673M-07 | Standard Specification for Sampling Procedure for Impact Testing of Structural Steel |
| ASTM B201 | Standard practice for testing Chromatic coating on Zinc and Cadmium surfaces |
| ASTM E94-93 | Standard Guide for Radiographic Testing |
| ASTM E 709-95 | Standard Guide for Magnetic Particle Examination |
| ASCE Manual 72 | - Load testing a simple structure |
| ASCE 10-97 | Standard Design of latticed steel transmission structures |
| AWS D1.1 | American Welding Society D1,1/D1,1M structural Welding code- Steel |
| ANSI B-182-2 | Bolts, nuts and washers dimensions |
DIN VDE 0101 - Isokeraunic Level
VDE 0201 - Climatic and environmental conditions
CVDE 0210 - Minimum safety factors under simultaneous working loads
ISO R898 Mechanical Properties of Fasteners
BS EN ISO 1461:1991 - High dip galvanized coatings on fabricated iron and steel articles. Specifications and standards
A) BS 5950: Welding Terms And Symbols
B) BS 729: Hot - Dip Galvanised Coating On Iron And Steel Articles
C) BS 2901: Filler Rods And Wires For Gas Shielded Arc Welding: Part 1 Ferritic Steels
D) BS 3692: ISO Metric Precision Hexagon Bolts, Screws And Nuts
E) BS 4360: Weldable Structural Steel
F ) BS 5135: Metal - Arc Welding Of Carbon And Carbon Manganese Steel
G) BS 5950: Part 1: Code Of Practice For Loading Latticed Tower & Masts
Part 2: Guide To The Background And Use Of Part 1"Code OF Practice For Loading"
Part 3: Strength Assessment of Members
H) DD 133 (1986): Code Of Practice For Loading Latticed Tower & Masts
I) BS 4592 (1987): Part 2: Specification For Expanded Metal Grating Panels
J) BS 4592 (1977): Code Of Practice For Protective Coating Of Iron And Steel Structure Against Corrosion
K) BS 4190: Bracing & Flanged Bolts
L) BS 4190: Rolled Steel sections, Flats & Plates
Moreover, we also can design tower foundation according to below standard:
BS 8004 - Code of Practice for Foundations
BS 8110 - Structural use of concrete
BS 4449 - Carbon steel bars for the reinforcement of concrete
If any special requirement, we can design and discuss with client.
