Violet visible discharge in darkness
Hissing sound and power loss
Vibration and Radio interference
All of the above
.
corona takes place at a voltage, lower than breakdown voltage
corona takes place at a voltage higher than breakdown voltage
corona is a current phenomenon
corona increases the transmission line efficiency
Non sinusoidal
Sinusoidal
D.C.
Square
the distance between the conductors is reduced
the conductor diameter is reduced
bundled conductors are used
stranded conductors are used
the current density is reduced
the eddy current in the conductor is eliminated
for a given cross section, the radius of the conductor is increased
of better ventilation in the conductor