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Electrical Engineering Materials
What is an Atom?
Atomic Energy Levels
Classification of Engineering Materials
Classification of Electrical Engineering Materials
Electron Configuration of Atom
Physical Properties of Materials
Mechanical Properties of Engineering Materials
Rutherford Atomic Model
Bohrs Atomic Model
Chemical Properties of Materials
Energy Bands in Crystals
Electrical Properties of Engineering Materials
Fermi Dirac Distribution Function
Magnetic Properties of Engineering Materials
Selection of Material for Engineering Application
Bases of existence of properties in materials
Low Resistivity or High Conductivity of Conducting Material
High Resistivity or Low Conductivity Conducting Material
Factors Effecting the Resistivity of Electrical Materials
Materials used for Heating Elements
Materials used for Precious Works
Materials Used for Transmission Line Conductor
Electrical Stranded Conductors
Materials used for Rheostats
Materials for Lamp Filaments
Classification of Electrical Conducting Material
Applications of Carbon Materials in Electrical Engineering
Selection of Materials Used for Electrical Contacts
Mechanism of Polarization
Dielectric Material as an Electric Field Medium
Electric Arc Furnace
Thermal Conductivity of Metals
Free Electron Theory of Metals
Thomson Plum Pudding Model (1911)
Electrical Stranded Conductors
Basic, reason of using stranded conductor is to make the conductor flexible. If we use a single solid conductor. It does not have sufficient flexibility and it is difficult to coil a solid conductor. Hence, it becomes difficult to transport a single solid conductor of long length over the distance. To eliminate this drawback, conductor is formed by using several thin wires of small cross section. These thin wires are called strands. By making the conductor stranded, it becomes flexible. Which makes stranded conductor suitable to be coiled easily to transport it over long distance.
Facts about Stranded ConductorThere are some facts to be noted about stranded conductors-
- The stranded conductor is having sufficient flexibility, which makes stranded conductor suitable to be coiled easily to transport it over long distance.
- For a stranded conductor of same cross sectional area, the flexibility of conductor increase with increase of number of strands in conductor.
- The stranded conductor is formed by twisting the strands together in layers.
- The strands of each layer are laid in helical fashion over the preceding layer. This process is called stranding.
- Generally, in successive layer, the stranding is done in opposite direction to preceding layer. This mean, if the strands of one layer are twisted in clockwise direction, the strands of next layer will be twisted in anticlockwise direction and so on ‘x’ is number of layers in conductor.
- Generally, the total number of strands in any conductor is given by the formulae of, Where, N is total number of strands in stranded conductor
- Generally the diameter of conductor can be calculated by using the Formulae of, Where, D is the diameter of conductor, ‘d’ is the diameter of each strand.
Table Representing the Number of Strands, Diameter and Cross-Sectional view of Stranded Conductor for Different no. of Layers
|Sl No.||No. of layers ‘x’||Total no. of strands N |
= 3x2 - 3x + 1
|Diameter of conductor D|
= (2x - 1)d
|Cross Sectional View of Stranded Conductor|
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