C) Derive from first(1st) principle, the load flow equation

QUESTION THREE (3)

A) prove that velocity of propagation in a concentric underground cable is equal to the speed of light

B) An overhead line is connected in series with a cable. The overhead line has an inductance of 2mH/km and capacitance of 0.01ûF/km. The cable has an inductance of 0.25H/km and capacitance of 0.102ûF/km. If a surge having a maximum value of 100kv travels along the overhead line towards its junction with the cable. Calculate

I) The velocity of wave propagation in the line and cable

II) The surge impedance of line and cable

I) The velocity of wave propagation in the line and cable

II) The surge impedance of line and cable