Energy losses in cables: What is the ohmic loss?

[Suziii]

having 2 cables of 790 mm^2 cross sectional area and voltage of 450 kV. the maximum power is 700 MW and the length of cables 580 km. Assuming the resistivity of the conductor is 1.67microohmcm. then what is the ohmic lose?

Thanks in advance

 

[tiny-tim]

Welcome to PF!

Hi Suziii! Welcome to PF!

Show us what you've tried, and where you're stuck, and then we'll know how to help!

 

[Suziii]

Thanks a lot.

I tried to find the ohmic power by the following formula: P(ohmic)=R (cable) x I^2 where R is the resistance and I the current.Then I divided the value for P (ohmic) and for P (max). however the problem is that by doing this I am getting higher value for P (ohmic) than for P (max) which should not be the case.

 

[tiny-tim]

Hi Suziii!

(have an ohm: Ω and a mu: µ and try using the X² icon just above the Reply box )

I tried to find the ohmic power by the following formula: P(ohmic)=R (cable) x I^2 where R is the resistance and I the current.Then I divided the value for P (ohmic) and for P (max). however the problem is that by doing this I am getting higher value for P (ohmic) than for P (max) which should not be the case.

I don't understand … I isn't given in the question

(did you use V²R instead of V²/R ?)

anyway, please show your actual calculations in future ​