2. General Considerations
Electrical Considerations for T.L. Design:
• Low voltage drop
• Minimum power loss for high efficiency of
power transmission.
• The line should have sufficient current
carrying capacity so that the power can be
transmitted without excessive voltage drop
or overheating.
3. • Conductivity of Conductor:
R = p.L/A , or
R = L/6. A
Where:
L: Conductor length.
A: Conductor cross sectional area.
p: resistivity
6: Conductivity 1/p)
4. • The conductor conductivity must be very high
to reduce Conductor resistance R and hence
reduce losses
I2 .R
5. Mechanical Considerations for T.L. Design:
• The conductors and line supports should
have sufficient mechanical strength:
- to withstand conductor weight, Conductor
Tension and weather conditions (wind, ice).
- The Spans between the towers can be long.
- Sag will be small.
- Reducing the number and height of towers
and the number of insulators.
6. • Heat expansion coefficient must be very small.
Rd' Ro•(! o•’)
a t is the heat expansion coefficient at t.
14. Advantages of ACSR
• High mechanical strength can be utilized by
using spans of larger lengths.
• A reduction in the number of supports also
include reduction in insulators and the risk of
lines outage due to flash over or faults is
reduced.
• losses are reduced due to larger diameter of
conductor.
• High current carrying capacity.
