[2024] All Factor Affecting Corona Effect Explained

    There are various factors that affects the corona effect which are listed below.

1. Line Voltage
2. Atmospheric Conditions
3. Air Density Factor
4. Conditions, Size and Nature of the Conductors
5. Spaces between Conductors
6. Magnitude of Flowing Current

Line Voltage

    The line voltage is the main factor affecting the corona effect in the transmission line. At low voltage, below the critical disruptive voltage i.e below 30kv, the stress on the air is not enough to ionize air so, no corona effect occurs below 30kv. When the line voltage reaches 30kv, the stress on the air becomes strong enough to ionize surrounding air making it partially conductive resulting corona effect above critical disruptive voltage.

Atmospheric Conditions

    Corona effect is affected by the atmospheric condition as corona is formed due to ionization of air surrounding the conductors. The voltage gradient for the dielectric breakdown of air is directly proportional to air density. On stormy days, the number of ions surrounding the conductor is more due to continuous airflow resulting corona effect occurs at a voltage lesser than on clear weather days.

   The decrease in value of breakdown voltage is followed by the increase in number of the ions in the air. The voltage system must be designed to accommodate these extreme atmospheric conditions.

Air Density Factor

    The corona loss is directly proportional to air density factor. Corona loss is high in transmission lines that passes through hilly region because air density factor is less in the hilly regions

Conditions, Size and Nature of the Conductors

    Corona effect is dependent on the shape, type of material and physical condition of the conductors. It is inversely proportional to the diameter of the conductors i.e increase in diameter reduces the corona effect.

    The rough or irregular conductors reduces the critical breakdown voltage due to concentrated electric field at rough spots resulting more corona effect. This factor is significant in the cities and near industrial areas with high pollution where mitigation strategies are essential to counter its negative effects on the system.

    The roughness of the conductor is usually due to dirt, dust, scratches, raindrops, snow, fog, condensation or accumulation on the conductor surfaces.

Spacing Between the Conductors

    If the spacing between the conductors are larger than its diameter then, only the corona effect occurs. But if the spacing is excessively large beyond a certain limit, the dielectric stress on the air decreases reducing the corona effect. If the spacing is very large, corona might not occur at all in that region of the transmission line.

Magnitude of Flowing Current

    The magnitude of the flowing current is directly proportional to the corona effect. High the magnitude current generate stronger magnetic field resulting high corona effect.

Conclusion

    Hope, you have clearly understand about the factors that effects the corona effect. Make sure to leave your opinion and suggestion about this post in the comment section below.