Corona discharge is an electrical phenomenon that occurs in high-voltage AC transmission lines, especially those operating at 200kV and above. It is a partial discharge of electrical energy into the surrounding air, leading to a noticeable hissing sound, a blue-violet glow, and the generation of ozone. This phenomenon results in power loss and can cause electromagnetic interference.

To mitigate corona discharge and its negative effects, a common industry solution is the use of bundled conductors. Instead of using a single large conductor per phase, multiple smaller conductors are used in a bundle. This increases the effective diameter of the conductor, which in turn reduces the electric field intensity at the surface, thereby suppressing corona formation.

Ningbo Changshi manufactures and exports high-quality overhead transmission line equipment and stringing equipment that are essential for the safe and efficient installation of bundled conductors and other anti-corona solutions.