Question

A certain 3-phase equilateral transmission line has a total corona loss of 53 kW at 106 kV and a loss of 98 kW at 110.9 kV. What is the disruptive critical voltage between lines? What is the corona loss at 113 kV?

Answer 1

As seen from Art., the total corona loss for three phases is given by

Other things being equal, P ∝ (V − V_c) ²