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I'm new in this forum, so if I select wrong subject or something then sorry.

I'm very, very far from physic, so I need your help.

In work, I have to calculate max current for HV power line.

As input have conductor temperature [*C] and material parameters (the resistance in ohm of the conductor at 20 *C, the conductor diameter limited in c, factor of absorption for conductor's surface).

I totally don't know how to calculate it. I've found some mathematical formulas on the internet, but there I need much more parameters which I don't have.

As result, I want to have [W/cm2].

Can someone help me with mathematical formulas and give an example?

In my example I have R20C = 0,0583, temperature = 10 [*C], D = 3.1049999924 [cm], factor of absorption 2,30E-05