What Is a Corona Treatment?

Corona refers to the phenomenon of partial discharge on the surface of a charged body in a gas or liquid medium. It usually occurs around high-voltage wires and near the tip of a charged body, and can produce ozone, nitrogen oxides and other substances. In substations and lines above 110kV, a light layer similar to a solar halo often appears, emitting "" and " mile" sounds. Corona can consume electrical energy and interfere with radio waves. Corona is a unique discharge of electrons in a very uneven electric fielda stable discharge in the form of a streamer.

For a long time, corona has been defaulted to "never disappear". Does corona never disappear?

Corona is generated because uneven conductors produce a very uneven electric field. Around the uneven electric field

1. Out of the slot of the wire rod. The winding exit slot is a typical sleeve-type structure.

1. Related to altitude. The higher the altitude and the thinner the air, the lower the stun discharge voltage.

2. Related to humidity. Humidity increases,

1. Because corona discharge is accompanied by the acousto-optic and thermal effects produced by the processes of ionization, recombination, excitation, and counter-excitation, it emits a "silk" noise, which affects human physiology and psychology. The problem below 220kV is not serious, and the influence of 500kV and above is relatively large. Secondly, the temperature of the surrounding gas is increased, and the thermal stability of the component is reduced.

2. At the tip of the tip, electrons and ions move at high speed under the action of a local strong field, forming an "electric wind". When the electrode is not rigid enough, the corona pole will vibrate and rotate, reducing the dynamic stability of the component.

3. A chemical reaction occurs in the gas discharge, which mainly produces ozone, nitrogen dioxide, and nitric oxide. Among them, ozone has a strong oxidation effect on metal and organic insulators, and nitrogen dioxide and nitric oxide will dissolve in water in the air to form nitric acid, which is highly corrosive.

4. Generate high-frequency pulse current, which contains a large number of high-order harmonics, which interfere with radio communication.

5. There will be considerable energy loss. ^[1]

Most plastic films (such as hydrocarbon films) are

Since various types of polyethylene (PE) are non-polar molecules, it is difficult to attach polar ink molecules to the surface of the PE film. Therefore, before performing PE film printing, electric spark treatment (or corona treatment) is performed to form a polar surface layer to improve the binding fastness with polar ink. ^[2]