TYPES OF CONDUCTOR

PRESENTED BY-SHANTANU KUMAR SINGHROLL NO-1401421059

CONTENT:-IntroductionDifferent types of conductor Conclusion

INTRODUCTION The important factor taken into account in the

selection of a conductor for a particular lines are conductivity, tensile strength, corona loss, local condition and cost.

The two most common conductor materials are

Hard drawn copper and aluminium.

Aluminium has the following advantages over copper:Lower costLesser weightLarger diameterHowever ,the tensile strength of aluminium is lower than copper.

Types of conductor1).Hard drawn copper conductor2).Cadmium copper conductor3).Steel core copper conductor4).Copper welded conductor5).All aluminium conductor(AAC)6).Aluminium conductor steel reinforced(ACSR)7).Smooth body ACSR8).Expanded ACSR

1).Hard drawn copper conductor:-

It has very high conductivity, good tensile strength, high life, and weather resisting properties.

2).Cadmium copper conductor:-

With addition of cadmium there is increase in the tensile strength of copper at the cost of decrease in the conductivity. Thus these conductors can be used for longer spans. As tensile strength is increased, longer spans with same sag is possible.

3).Steel core copper conductor

The steel cored copper conductors are made by surrounding a steel core with on or more layers of copper strands. Due to addition of steel core tensile strength of conductor is increased.

4).Copper welded conductor

In this ,copper is welded on the steel wire to make copper welded conductor.The conductivity of copper weld conductor varies from  30 to 60% of that a solid copper conductor with same diameter.It is used for longer span such as river crossing.

5). All aluminium conductor(AAC)Due to increasing cost of copper, aluminium is used in transmission system. For a specific resistance, cross sectional area of aluminium condcutor is greater than that of copper while its weight is about 50% of that of copper conductor. This makes transportation and erection of such conductors economical. Corona effect is reduced due to increased diameter of conductor.  

6).Aluminium conductor steel reinforced(ACSR)

It has a steel core forming the central layer of the stranded conductor around which we have a layer of aluminium strand.The important advantage of ACSR-high tensile strength-light weight -small sag-smaller support -high corona inception level

7).Smooth body ACSR

Smooth body ACSR conductor is made by pressing conventional ACSR conductor through dies to flatten the aluminium strands into segmental shape.Thus with same aluminium area, diameter of steel core is increased which increases mechanical strength.

8).Expanded ACSRThe expanded conductors are made by adding a plastic or fibrous material between steel core and aluminium strands. This increases diameter of conductor which reduces corona loss.

Conclusion

Hence all the conductors have their own area of application.The ACSR conductor are widely used in transmission line.