# What is meant by corona in power system?

## What is meant by corona in power system?

Corona Discharge (also known as the Corona Effect) is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor that is electrically charged. Corona discharge can cause an audible hissing or cracking noise as it ionizes the air around the conductors.

What is corona in transmission lines?

DEFINITION: The ionization of air surrounding the high voltage transmission lines causing the conductors to glow, producing a hissing noise, is called Corona Discharge or Corona Effect.

### What is corona power loss?

When the potential difference between two conductors of transmission line raised beyond a certain limit, at a point is reached when a violet glow appears around the conductor surface with a hissing noise and ozone gas smell this phenomenon called Corona and this causes corona power loss in the transmission line.

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How corona effect is reduced?

Corona discharge can be reduced by the following methods: By increasing the distance between conductors: Larger the conductor spacing, lesser the corona. Using bundled conductors: Using a bundled conductor increases the effective diameter of the conductor. This results in reduction of the corona discharge.

#### What factors affect corona?

There are numerous factors such as system frequency, system voltage, air conductivity, air density, conductor radius, the surface of the conductor, load current and atmospheric conditions, on which the corona loss depends.

Actually, due to corona, the air surrounding the conductor becomes conductive and hence effective diameter increases. Due to this increase in effective diameter, the shunt capacitance of line increases. Due to increased effective diameter, electrostatic stress between the power conductors reduces.

## How can we reduce corona power loss?

Corona discharge can be reduced by the following methods:

1. By increasing the conductor size: As explained above, larger the diameter of the conductor, lesser the corona discharge.
2. By increasing the distance between conductors: Larger the conductor spacing, lesser the corona.
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How is corona loss estimated?

The corona power loss in a transmission line , with the same bundle configuration, can be estimated by calculating the surface gradient on the transmission line conductors and reading the corona loss corresponding to that gradient, from the graph.