A single-phase overhead transmission line consists of two conductors, each of diameter 2 cm, with a spacing of 1.5 m between their centres. Determine the line voltage at which corona breakdown commences, given that the dielectric strength of air is 21 kV/cm (rms).

If a power system has a total demand of 1000 MW and a required spinning reserve of 10%, what should be the total available generation capacity?

A power system network with a base capacity of 100 MVA has a source impedance of 10% (0.1 p.u.) at a given point. The short-circuit fault level at that point is: