Insulation Level

[Danilo917]

Gents

if the proposed transmission line is at high altitude area (more than 2000m above sea level) with a span of 300km, 345kV..by simple high level analysis, what are the considerations to be made in design to minimise the line cost in terms of insulation voltage levels?

thanks,
Danilo

 

[cuky2000]

Considering that the altitude derating factor at 2000 m is around 90%, the standard 345 kV dielectric design parameters of the T. Line should be compensated around 10%. This will impact the number of insulators, minimum sag, the phase-to-phase and phase-to ground clearances.
Standard tower design for 400 kV (or 500 kV) at sea level might be used for this application.