Which of the following is NOT suitable for the overhead conductor of a transmission line?

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SSC JE Electrical 10 Oct 2023 Shift 2 Official Paper-I
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  1. High electrical conductivity
  2. High specific gravity
  3. Lower cost
  4. High tensile strength

Answer (Detailed Solution Below)

Option 2 : High specific gravity
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Overhead conductor of a transmission line

  • Stranded conductors are used in overhead transmission lines rather than Solid Conductors.
  • The reason is that stranded conductors offer more flexibility than solid conductors.
  • The flexibility of stranded conductors is a good property that makes them easier to install and have a longer life as compared to solid conductors. Also, the stranded conductors are capable to withstand more vibration and bending before breaking.
  • The most common conductor in use for transmission today is aluminum conductor steel reinforced (ACSR).

Properties of overhead conductor of a transmission line

An ideal conductor must have the following features:

  • High electrical conductivity
  • High tensile strength to withstand mechanical stresses
  • Relatively lower cost without compromising much of other properties
  • It should possess low specific gravity so that the weight per unit volume is small. 
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