This section provides an overview for transmission lines as well as their applications and principles. Also, please take a look at the list of 6 transmission line manufacturers and their company rankings. Here are the top-ranked transmission line companies as of July, : 1.Electronics Research, Inc., 2.Houston Wire & Cable Co., 3.PRYSMIAN AUSTRALIA PTY LTD.

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What Is a Transmission Line?

Transmission lines are lines of misaligned atoms (defects) in metals.

Although it has been believed that all atoms in metals are regularly aligned, it has become clear that there are actually disarrangements in the alignment of atoms in some places.

When a group of atoms on a plane shifts in the same direction, the plane is called a slip plane, but it requires a considerably large amount of energy to shift a group of atoms at once. In reality, the metal begins to deform with very little force as a portion of the atoms are displaced in sequence along the slip surface. This theory was proposed by Taylor, Olowan, and others in .

Uses of Transmission Lines

Dislocation lines are deformed by external forces caused by metal forging or plastic forming. Whenever deformation occurs, transmission lines are generated and move inside the metal. In order to strengthen metals, it is necessary to suppress the movement of dislocation lines.

Methods to suppress transmission lines include work hardening, precipitation strengthening, solid solution strengthening, and grain refinement.

Transmission lines are used to measure dislocation density by X-ray analysis. Dislocation density is the total length of dislocation lines. By measuring dislocation density, one can evaluate the degree to which a material has been strengthened. A greater dislocation density will create a greater strength material.

Other Information on Transmission Lines

1. Characteristics of Transmission Lines

Dislocation lines, which are linear lattice defects, are generated during plastic deformation of crystals and propagate to neighboring atoms, eventually reaching the surface of the crystal and displaying a step of one atom. Plastic deformation occurs inside the crystal as dislocation lines, which move to neighboring atoms step by step, so that no step is suddenly formed on the crystal surface.

An external shear force is required to cause dislocation migration, and this force is called the Peierls force. The Peierls force can be obtained from the spacing of slip surfaces, Burgers vector, Poisson's ratio, and stiffness ratio.

2. Classification of Transmission Lines

The Burgers vector is a measure of the size or direction of dislocations. Transmission lines are classified into edge dislocations, helical dislocations, and mixed dislocations according to the relationship between transmission lines and Burgers vectors.

Edge Dislocations
This is an image of an atomic plane with one extra blade cut into the top or bottom half of the atomic plane in a row of many atomic planes. If there are slip planes at the top and bottom and a blade dislocation in the top half, the lattice is compressed at the top and expanded at the bottom, the condition is called "positive dislocation" and the opposite is called "negative dislocation".

Helical Dislocation
When a line is defined in a metal, a 360° rotation around that line results in a displacement of the atomic layers in one plane. Depending on the direction of displacement, it is distinguished as right-handed or left-handed. In a blade dislocation, the Burgers vector and transmission lines are perpendicular to each other, while helical dislocations are parallel.

Mixed Dislocation
A dislocation is neither right-angled nor parallel and is a mixture of blade dislocations and helical dislocations.

Top 10 Transmission Line Construction Companies

Energy Acuity is the leading provider of power generation and power delivery market intelligence. Below are the Top 10 Transmission Line Construction Companies by miles of transmission line within the Energy Acuity&#;s Grid Platform.

Top 10 Transmission Line Construction Companies

1.) Quanta Services
Projects &#; 281
Transmission Line (Miles) &#; 11,174.80

Quanta Services (NYSE: PWR) is a leading provider of specialized contracting services, delivering infrastructure solutions to the electric power and natural gas and pipeline industries. The company provides a comprehensive range of services, including the design, installation, maintenance and repair of virtually every type of infrastructure. With approximately 17,800 employees, major offices in 40 states, and field operations across the United States and Canada, Quanta has the manpower, resources and expertise to complete projects that are local, regional, national or even international in scope.

2.) MYR Group Inc.
Projects &#; 141
Transmission Line (Miles) &#; 5,910.50

MYR Group Inc. is a holding company of specialty construction service providers. Through subsidiaries dating back to , MYR is one of the largest national contractors servicing the transmission and distribution sector of the United States electric utility industry. Transmission and Distribution customers include electric utilities, cooperatives and municipalities. The Company also provides Commercial and Industrial electrical contracting services to facility owners and general contractors in the Western United States. MYR Group&#;s comprehensive services include turnkey construction and maintenance services for the nation&#;s electrical infrastructure.

MYR Group offers a full suite of transmission and distribution (T&D) capabilities to construct the largest and most complex electrical infrastructure projects across the country, as well as a comprehensive commercial and industrial (C&I) service offering for clients throughout Arizona and Colorado. Their T&D clients include more than 125 electric utilities, cooperatives and municipalities.

3.) ABB
Projects &#; 59
Transmission Line (Miles) &#; 3,494.1

ABB provides power and automation technologies for its utility and industrial customers. It focuses on power transmission, distribution and power-plant automation serves electric, gas and water utilities, as well as industrial and commercial customers. The Company also delivers automation systems that measure, control, protect and optimize plant applications across a range of industries.

ABB (Asea Brown Boveri), was the result of a merger between Asea AB of Sweden and BBC Brown Boveri Ltd. of Baden, Switzerland in . The merged entity became the world&#;s leading supplier in the $50 billion electric power industry. At that time ABB controlled as much as a third of Europe&#;s business and more than 20 percent of the world market. It successfully integrated 850 subsidiary companies and 180,000 employees operating in 140 countries.

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4.) Kiewit
Projects &#; 83
Transmission Line (Miles) &#; 3,409.30

Kiewit is one of North America&#;s largest and most respected construction and mining organizations. For over 120 years, they have delivered world-class solutions to projects of every size, in every market. Kiewit consistently ranks as one of the top 10 contractors by Engineering News-Record.

Kiewit has served the power generation market for more than 30 years. They bring in-depth expertise to deliver power projects using engineer-procure-construct (EPC), design-build, design-assist, and traditional bid-build models. Through their subsidiary Kiewit Power Engineers Co., they provide a complete array of design and engineering services for major power plant projects that set industry standards for quality design and superior function worldwide.

Over the last 15 years, Kiewit has constructed and provided start-up services for more than 140 power-related projects totaling more than $6 billion in contract revenue.

5.) Valard Construction
Projects &#; 37
Transmission Line (Miles) &#; 2,977.90

Valard is one of Canada&#;s largest power line contractors, serving clients in the public and private sectors. They offer construction services in overhead and underground transmission and distribution systems, substations, fiber optics, and substation and transmission foundations. Valard also offers turnkey services in all areas of our operations.

6.) Burns & McDonnell
Projects &#; 145
Transmission Line (Miles) &#; 2,683.90

Burns & McDonnell, headquartered in Kansas City, Mo., is a full-service engineering, architecture, construction, environmental and consulting solutions firm. Their multidisciplined staff of more than 3,600 employee-owners includes engineers, architects, construction experts, planners, estimators, economists, technicians and scientists, representing virtually all design disciplines. They plan, design, permit, construct and manage facilities all over the world, with one mission in mind:

7.) M.J. Electric LLC
Projects &#; 79
Transmission Line (Miles) &#; 2,658.00

M. J. Electric, LLC is a member of the National Electrical Contractors Association for much of its history. MJE has been active in the organization with employees serving on various committees, serving as Governors, and was a founding member of the Electric 21 Council.

8.) Aecom
Projects &#; 29
Transmission Line (Miles) &#; 2,523.00

Aecom is a global network of experts working with clients, communities, and colleagues to develop and implement innovative solutions to the world&#;s most complex challenges. Worldwide, Aecom designs, builds, finances, operates and manages projects and programs that unlock opportunities, protect the environment and improve people&#;s lives.

9.) GE Energy
Projects &#; 35
Transmission Line (Miles) &#; .30

GE Energy is one of the world&#;s leading suppliers of power generation and energy delivery technologies, with revenue of $22 billion. Based in Atlanta, Georgia, GE Energy works in all areas of the energy industry including coal, oil, natural gas, and nuclear energy; renewable resources such as water, wind, solar and biogas; and other alternative fuels. Numerous GE Energy products are certified under ecomagination, GE&#;s corporate-wide initiative to aggressively bring to market new technologies that will help customers meet pressing environmental challenges.

10.) Wilson Construction Company
Projects &#; 50
Transmission Line (Miles) &#; .20

Wilson Construction offers a collaborative team environment to produce personalized solutions and exceptional results for our clients. Whether it is building a new switchyard or substation, installing transmission lines, performing power plant interconnects, or other needs in the power generation, transmission, distribution area or environmental areas, Wilson Construction provides the proven design/build expertise, safety conscious operations, and client-focused construction services necessary to win your trust time and time again.

Source: Energy Acuity

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