Following are some of the important factors that need to be considered while deciding the transmission system.
1. Type and size of a conductor.
2. Voltage level.
3. Line regulation and control of voltage.
4. Efficiency of transmission.
5. Corona loss.
6. Power flow capability and stability
7. Requirement of compensation.
8. Levels of faults at various bus bars and requirement of new circuit breakers.
9. Grounding needs.
10. Protection schemes for new lines.
11. Co-ordination of insulation.
12. Mechanical design aspects which include stress and sag calculations, composition of conductor, spacing of conductor, and configurations for insulators.
13. Design of power system structure.
14. Economical aspects.
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