Mechanical design of overhead lines

Typically, the strength of the line needs to be such so it can withstand the worst probable weather conditions.

mechanical design of overhead electrical transmission lines

The conductor is one of the important items as most of the capital outlay is invested for it. Our system allows you to get those last minute hours when you need them the most! In this, we shall focus our attention on the various aspects of the mechanical design of overhead lines. The conductor material now being employed in certain cases is copper alloyed with cadmium.

Considering the combined properties of cost, conductivity, tensile strength, weight etc.

Mechanical Design of Overhead Lines

Learning Objectives This PE continuing education course is intended to provide you with the following specific knowledge and skills: This asks for the use of adequate mechanical safety factors in order to ensure the continuity of line operation.

However, an overhead line is subjected to various weather conditions and other external interferences. The underground cables are not commonly used for power transmission for two main reasons.

Designing Electrical Overhead Distribution Lines

In order to increase the tensile strength, the aluminium conductor is reinforced with a core of galvanised steel wires. Conductor materials used in Overhead lines: Our goal is to provide you with the most efficient and cost-effective way to fulfill your mandatory PDH requirements.

Typically, the strength of the line must be able to withstand the most severe weather Mechanical design of overhead lines likely to occur. Certificate of Completion Upon successful completion of the quiz, print your Certificate of Completion instantly.

Upon successful completion engineers will be able to address important overhead line design considerations and independently complete different calculations. Therefore, it is being widely used as a conductor material.

With the increase in power demand and consequent rise in voltage levels, power transmission by overhead lines has assumed considerable importance. The underground cables are rarely used for power transmission due to two main reasons. The figure below shows steel cored aluminium conductor having one steel wire surrounded by six wires of aluminium.

The increased X-section of aluminium exposes a greater surface to wind pressure and, therefore, supporting towers must be designed for greater transverse strength.

Therefore, cadmium copper conductor can be used for exceptionally long span overhead lines. This course focuses on the different aspects of mechanical design of overhead lines.

Overhead Lines design - Main components of overhead lines

It is particularly profitable to use aluminium for heavy-current transmission overhead line design where the conductor size is large and its cost forms a major proportion of the total cost of complete installation.

An overhead line may be used to transmit or distribute electric power. This requires the use of adequate mechanical safety factors to ensure the continuity of line operation.

Electrical Design of Overhead Power Transmission Lines

Therefore, while selecting a conductor material for a particular case, a compromise is made between the cost and the required electrical and mechanical properties. In the manufacture of stranded conductors, the consecutive layers of wires are twisted or spiralled in opposite directions so that layers are bound together.

The relative comparison of the two materials is briefed below: Copper has high current density i. The composite conductor thus obtained is known as steel cored aluminium and is abbreviated as ACSR aluminium conductor steel reinforced.

The conductor material used for transmission and distribution of electric power should have the following properties: However, due to the high cost of cadmium, such conductors will be economical only for lines of small X-section i. Commonly used conductor materials: To buy the course and take the quiz, please click on: Vermont Course Highlights This online engineering PDH course presents the mechanical designs of overhead lines including their main components, insulator types, string efficiency and various factors affecting their design.

The most commonly used conductor materials for overhead lines are copper, aluminium, steel-cored aluminium, galvanised steel and cadmium copper.

For this reason, the supporting structures for aluminium need not be made so strong as that of copper conductor. Once you complete your course review, you need to take a multiple-choice quiz consisting of forty-five 45 questions to earn 8 PDH credits.

Now-a-days the trend is to use aluminium in place of copper. This course is intended to provide you with the following specific knowledge and skills: For your convenience, we will also email you your Certificate of Completion.Mechanical Design of Overhead Lines - Free download as Powerpoint Presentation .ppt /.pptx), PDF File .pdf), Text File .txt) or view presentation slides online.5/5(1).

TRANSMISSION OVERHEAD CONSTRUCTION STANDARDS MANUAL Reviewed By (IUSA): Zainabu, Kyosima Date: The ENGINEER refers to the design engineer preparing the foundation design. IUSA This is Iberdrola USA.

How Mechanical Design Overhead Distribution Lines

ANSI C Standard for Galvanized Steel Bolts and Nuts for Overhead Line Construction. Abstract: Electrical Design of Overhead Power Transmission Lines discusses everything electrical engineering students and practicing engineers need to know to effectively design overhead power lines.

Co-written by experts in power engineering, this detailed guide addresses component selection and design, current IEEE standards, load-flow analysis, power system stability, statistical risk.

However, an overhead line is subjected to various weather conditions and other external interferences. This requires the use of adequate mechanical safety factors to ensure the continuity of line operation. Designing Electrical Overhead Distribution Lines.

Learn how to design electrical overhead distribution lines to comply with the recently revised National Electrical Safety Code ® by participating in group exercises with real-life design problems.

You will receive a copy of the edition of the NESC book. The results are presented of a program devoted to the selection of electrical and mechanical design criteria and parameters for overhead power transmission lines for ac systems rated at from to kV and for dc systems rated at from to kV.

Information is included on the environmental.

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Mechanical design of overhead lines
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