Critical disruptive voltage is a voltage at which

A. corona is just initiated
B. corona is visible with blue or violet colour
C. both 1 and 2
D. nether 1 nor 2

Answer: A. corona is just initiated

Explanation:
Critical Disruptive Voltage is defined as the minimum phase to neutral voltage required for the Corona discharge to start. 

Thus for corona to start, the potential gradient at the surface of conductor must be greater than the dielectric strength of air.

The visual critical voltage is defined as the minimum phase to the neutral voltage which glows and appears all along the line conductor. 

It has been seen that in the case of parallel line conductors, the corona glow does not begin at the disruptive voltage but at a higher voltage called visual critical voltage.

The voltage at which corona is just initiated is called critical disruptive voltage(Vc). At this critical disruptive voltage, corona is not visible but noise can be heard.


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