Corona effect in power system

Corona effect:

Electric power transmission is practically related to the bulk transfer of power consumption, as well as the construction of stations located at several kilometers away from the main consumption centers or cities. For this reason, long-term transmission cables are highly needed for effective power transfer, which clearly falls into heavy losses across the entire system. To reduce them, there has been a major challenge for late electric engineers and in order to do this, there should be a clear understanding of the nature of nature and nature. In this article, Corona has a major role in the power system to reduce the efficiency of EHV (additional high voltage lines), on which we are going to focus.

What is the effect of Corona in the power system and why does it happen?

In order to effectively reduce the corona effect, two factors are emphasized below, as outlined below: - 

A) Alternatively, the potential potential difference should be given in line. 

B) The spacing of the conductor will be significantly larger than the line diameter.

When an alternate transmission line is done to flow into two conducts, whose distance is larger than their diameter, then the conductor (made of ions) is subject to stress, which depicts the air around it. . There is nothing at the lower prices of the supply end voltage, because the stress is very low to reduce the ion of the air outside. But when the potential difference is known as some important disruptive voltage of about 30 KV, then the strength of the area increases and then the surrounding air experiences high stress, which is different in the anion conducting the atmosphere. Go. Due to the flow of these ions due to the ionized surrounding results in the electrical discharge around the conductor, along with the faint luminescence giving rise to shine, with the sound running with the ozone release. This phenomenon of electrical discharge occurring in the transmission line for high values ​​of voltage is known as the corona effect in the electrical system. If the voltage in the lines still increases, the noise becomes sharper with the noise in the system, the loss of high power in the system is damaged.

Corona Affected Factors in Power Systems:

As previously mentioned, at low prices of voltage, at low rates of voltage, the conductor's line voltage is the main determining factor for corona in transaction lines, stress on the air is very low to separate them, hence no electrical discharges Does not happen. Because of the increasing voltage corona effect in the transmission line due to the ionization of atmospheric air around the cable, it is mainly influenced by the physical condition of the environment along with the conditions of the cable. Now let's look at this criterion, with more details:

Corona's atmospheric conditions in transmission lines:

We have proved that the voltage gradient is directly proportional to the density of air for the dielectric disintegration of the air. Therefore, in a stormy day, due to the continuous air flow, the number of ions present around the conductor is more than the normal, and hence compared to one day compared to one day, electricity in such transmission lines There is a high probability of the flow of clean weather. The system must be designed to consider those extreme situation in transmission Line.

Status of Cables for Corona in Transmission Line:

This special event relies heavily on the conductor and its physical condition. This is an inverse proportional relationship with the diameter of the conductor. That is, with the increase in diameter, the effect of Corona on the power system is greatly reduced; In addition, the presence of dirt or roughness of conductor has reduced significant breakdown voltage, due to which carrier corona is prone to deficit . Therefore, due to high pollution in most of the cities and industrial areas, this factor is of appropriate importance to dealing with the bad effects on the system.

Space between the conductor:

As already mentioned, the corona should be very much effective in the distance between the diameter, but if the length increases more than a certain limit, then the stress decreasing on air decreases, and As a result, the effect of corona as well reduces if the spacing is too large, then the Corona can not be at all for that area of ​​the transmission line.