supports of overhead line
TRANSCRIPT
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Supports Of Overhead Line
Submitted by:-
Shreyansha Tai Sonwane
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Index
1) Introduction2) Line Poles3) Tower 4) Cross Arms5) Stay Set6) Insulators 7) Conductors
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Introduction
What is an Overhead Line ? An overhead power line is a
structure used
in electric power transmission and distribution
to transmit electrical energy along large
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PolesPoles are classified on the basis of material used in
making poles
Wooden poles
Concrete polesa) Reinforced cement concrete poles (RCC)
b) Prestressed cement concrete poles (PCC)
Steel polesa) Tubular poles
b) Rail poles
c) RS joist poles
d) H beam poles
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Wooden Pole
RCC Pole
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Steel Poles
Cross Section of Rail Pole
Tubular Pole
Rail pole
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RS Joist
H Beam
Cross section of RS joist
Cross section of H beam
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Towers
Based on numbers of circuits
carried by a transmission
tower, it can be classified as
Single circuit tower
Double circuit tower
Multi circuit tower.
Single circuit tower
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Double circuit tower Multi circuit tower
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According to the angle of deviation there are four typesof transmission tower A – type tower – angle of deviation 0o to 2o
B – type tower – angle of deviation 2o to 15o
C – type tower – angle of deviation 15o to 30o
D – type tower – angle of deviation 30o to 60o
As per the force applied by the conductor on the crossarms, the transmission towers can be categorized inanother way Tangent suspension tower and it is generally A - type
tower Angle tower or tension tower or sometime it is called
section tower All B, C and D types of transmission towers come under thiscategory.
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Angle Tower Tangent Tower
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Cross Arms
V shaped cross arm Straight cross arm
The purpose of cross arms is • to provide required space between the conductors• to provide base for mounting insulators
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Stay Set
The purpose to use stay set in distribution line is To balance the forces of line in different direction.
The main components of stay set are• Anchor rod• CI anchor plate• Stay bow • Thimbles• Stay wire• Stay clamp• Turn buckle
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Stay insulator
Stay wire
Thimble
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Insulators
1) Insulators are mounted on the cross arms.
2) The purpose of using insulator is to
Provide insulation between live part & earth part.
Provide support to the conductor.
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Properties of overhead line insulator
High mechanical strength
High relative permittivity
High insulation resistance
Ability to withstand large temperature variation
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Types of insulators
Pin type insulator
Shackle insulator
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Suspension type insulator Strain type insulator
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Conductors
The purpose of using Conductor is to
Transmit the electricity from generation plants to
our houses
Properties of a good conductor
(i) High electrical conductivity.
(ii) High tensile strength in order to withstand
mechanical stresses.
(iii) Low cost so that it can be used for long
distances.
(iv) Low specific gravity so that weight per unit
volume is small.
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Aluminium conductor steel reinforced
(ACSR)
Cross section of 3 layered ACSR
•Steel strands
•Aluminium strands
•It consists of a pore of galvanized steel strand surrounded by a no. of aluminium strands. •The steel pole takes a greater percentage of mechanical stress while the aluminium carries the bulk current. •ACSR conductor being of high tensile strength & lighter in weight produces small sag & therefore can be used for longer spans.
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All Aluminum Alloy Conductors
(AAAC)
• In AAAC conductors central strands are made out of high strength Aluminum-Magnesium-Silicon alloy.
• These conductors are designed to get better strength to weight ratio and offers improved electrical characteristics,
• It has excellent sag-tension characteristics and superior corrosion resistance when compared with ACSR.
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