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wire potential
Hi ,
I would like some help with the following problem:
A highvoltage power line(cable radius a=2cm) is at a voltage V=345[kV]( with respect to ground). The power line is at a height h=50[m] above the ground which may be approximately modeled as an infinite ground plane( see picture attacjed).
1Calculate the electric field vector at a point on the ground directly below the line. Calculate field vector at the point on the power line that is closer to the earth (the bottom of the line).
2Estimate the voltage at wich dielectric breakdown happen(Ec=3[MV] for the given a.
3Estimate the radius radius of the power line at which dielectric breakdown happens for the given V
Assume that I have found the first question.
For the second question: I have done a problem where I needed to compute the voltage between 2 wires of radius a and distant center to center by the distance h.
I would like to know if I can use this result to answer the question 2 and 3.
I have some concern about the fact that there is the ground plane.( There is some restriction on how far should y varies because of the groun plane)
It was V=[rho* ln(a/h)]/(pi*epsilon)[V]
If I cannot use this result , please what can I do?
thank you
B