Electrical Transmission tower

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A electrical transmission tower, also named electricity pylon is a tall structure, usually a steel lattice tower or monopole, used to support an overhead power line. They are used in high-voltage AC and DC systems, and come in a wide variety of shapes and sizes. Typical height ranges from 15 to 55 meters (49 to 180 ft), though the tallest are the 370 m towers or even higher as per client requirement. In addition to steel, other materials may be used, including concrete and wood. There are four major categories of electrical transmission towers: suspension, terminal, tension, and transposition. Some transmission towers combine these basic functions. Transmission towers and their overhead power lines are often considered to be a form of visual pollution. Methods to reduce the visual effect include undergrounding. MEGATRO is the professional manufacturer for electrical transmission tower &mast with more than ten years experiences. Our design engineer from China, India and Egypt, who can design every type of power transmission line or other type tower& mast, all our welder worker are certified, and company certified by ISO9000, 14000 and 18000 management system. MEGATRO is one of the few manufactures who assemble a face of every tower section. 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. Our tubular lattice steel tower for power transmission power has three types, one is four-leg tower, one is three-leg tower, and another is monopole tower. After fabrication all electrical transmission 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's electrical transmission 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: 10 tons 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 conform to the following standards (Chinese Standard or other standard): 1. GB/T2694-2003 Transmission line 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 We also adopt British, American and other international standard "Electric transmission" redirects here. For vehicle transmissions, see diesel-electric transmission. power transmission line Electric-power transmission is the bulk transfer of electrical energy, from generating power plants to electrical substations located near demand centers. This is distinct from the local wiring between high-voltage substations and customers, which is typically referred to as electric power distribution. Transmission lines, when interconnected with each other, become transmission networks. In the US, these are typically referred to as "power grids" or just "the grid." In the UK, the network is known as the "National Grid". North America has three major grids, the Western Interconnection, the Eastern Interconnection and the Electric Reliability Council of Texas (ERCOT) grid, often referred to as the Western System, the Eastern System and the Texas System. Historically, transmission and distribution lines were owned by the same company, but starting in the 1990s, many countries have liberalized the regulation of the electricity market in ways that have led to the separation of the electricity transmission business from the distribution business.[1] Most transmission lines use high-voltage three-phase alternating current (AC), although single phase AC is sometimes used in railway electrification systems. High-voltage direct-current (HVDC) technology is used for greater efficiency in very long distances (typically hundreds of miles (kilometres)), or in submarine power cables (typically longer than 30 miles (50 km)). HVDC links are also used to stabilize against control problems in large power distribution networks where sudden new loads or blackouts in one part of a network can otherwise result in synchronization problems and cascading failures. Electricity is transmitted at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission. Power is usually transmitted through overhead power lines. Underground power transmission has a significantly higher cost and greater operational limitations but is sometimes used in urban areas or sensitive locations. A key limitation in the distribution of electric power is that, with minor exceptions, electrical energy cannot be stored, and therefore must be generated as needed. A sophisticated control system is required to ensure electric generation very closely matches the demand. If the demand for power exceeds the supply, generation plants and transmission equipment can shut down which, in the worst cases, can lead to a major regional blackout, such as occurred in the US Northeast blackouts of 1965, 1977, 2003, and other regional blackouts in 1996 and 2011. To reduce the risk of such failures, electric transmission networks are interconnected into regional, national or continental wide networks thereby providing multiple redundant alternative routes for power to flow should (weather or equipment) failures occur. Much analysis is done by transmission companies to determine the maximum reliable capacity of each line (ordinarily less than its physical or thermal limit) to ensure spare capacity is available should there be any such failure in another part of the network.

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Qingdao Megatro Mechanical and Electrical Equipmen

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