Factors and condition affecting corona in power system

v Factors and condition affecting corona

The corona phenomenon is affected by the physical condition of the atmosphere as well as by the conditions of the line. Here are the factors that an aura depends on:

· Atmosphere

Since the corona is formed due to the ionization of the air surrounding the conductors, it is affected by the physical condition of the atmosphere. In inclement weather, the number of ions is more than usual, and as such the corona occurs with much less effort compared to mild weather. [5]

· Connector size

The effect of corona depends on the shape and conditions of the conductors. The rough and irregular surface will lead to more corona because the irregularity of the surface reduces the value of the breakdown voltage. Thus the stranded conductor has an irregular surface and thus leads to more corona which is a solid conductor.

· Spacing between conductors

If the distance between the conductors is very large compared to their diameters, then there may not be any corona effect. This is because the greater distance between the conductors reduces the electrostatic pressure on the conductor surface, thus avoiding corona formation.

· Voltage line

The line voltage greatly affects the corona. If it is low, there is no change in the condition of the air surrounding the conductors, and therefore the corona is not formed. However, if the line voltage has a value that causes the electrostatic pressure developed on the surface of the conductor to make air around the conductor, then the corona is formed.

· Humidity

The higher the humidity level around the electrical conductor, the more corona phenomenon will appear from the conductor [2]

v Corona energy loss

Accompanying the formation of the areola and the loss of energy which dissipates in the form of light, heat, sound and chemical action. When the sabotage voltage is exceeded, the coronal energy loss is given by:

Pc = )212.4 /δ( (f+25)(V_p-U_c)²(r/d)^.5(10^-5) [3]