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Bundled conductors that are used to increase line voltage in EHV lines for raising critical corona voltage depend on
1. Number of conductors in the group
2. Voltage gradient
3. Optimum spacing
4. Communication interference

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Correct Answer - Option 1 : Number of conductors in the group
  • It is economical to transmit large chunks of power over long distances by employing EHV lines.
  • The line voltages that can be used are severely limited by the phenomenon of corona.
  • Corona is the result of ionization of the atmosphere when a certain field intensity is reached.
  • Corona discharge causes communication interference and associated power loss which can be severe in bad weather conditions.
  • Critical line voltage for formation of corona can be raised considerably by the use of bundled conductors (a group of two or more conductors per phase).
  • This increase in critical corona voltage is dependent on number of conductors in the group, the clearance between them and the distance between the groups of forming the separate phases.
  • The spacing of conductors in a bundle affects voltage gradient and the optimum spacing is of the order of 8-10 times the conductor diameter, irrespective of the number of conductors in the bundle.

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