14-11-2012, 02:41 PM
DISTRIBUTION
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Properties of Conductor materials
1. High electrical conductivity
2. High tensile strength
Properties of Conductor materials
g g
3. Low weight
4. Low coefficient of expansion
5. Low density
6. Low specific gravity so that weight per unit
volume is small
7. Low cost so that it can be used for long distance
Choice depends upon
• The cost of material
• Required electrical properties
Choice depends upon
• Local conditions
• Required mechanical strength
Copper
1. Best conductor.
2. It has high electrical conductivity and high tensile
t thf ll t ft i i
Copper
strength for all type of transmission.
3. High current density.
4. It is quite homogeneous, durable and has a high
scrap value.
5. It has low specific resistance.
6. Density is 8.94 g/cm3 .
7. Its melting point is 1083 oC.
• USE : Copper conductor having a steel core is
employed for long span transmission lines.
Aluminium Conductor Steel Reinforced (ACSR)
• The tensile strength of aluminium conductor is
increased with a core of galvanized steel wires.
Li ht i ht d ll d th f b
Aluminium Conductor Steel Reinforced (ACSR)
• Light weight produces small sag and therefore can be
used for longer spans.
• Problem : It is gets deteriorated in service due to
atmospheric corrosion.