The corona effect is a special discharge phenomenon under a high-voltage electric field. When the line voltage rises to a certain extent, the charge density on the surface of the wire increases abruptly, especially at the tip, joint or burr, the electric field strength will be quickly concentrated. Once the local electric field strength exceeds the breakdown field strength of 30kV/cm of air at standard atmospheric pressure, the air around the wire will be ionized into positive and negative ions. These ions move at high speed and collide with neutral molecules, forming a faint halo visible at night, accompanied by a slight sizzling sound, this is the corona effect. Of course, the corona effect is not exclusive to ultra-high voltage lines. If the wires of 110kV and above are improperly selected, the surface is defective, or the arrangement is unreasonable, different degrees of corona may also occur.
The harm of the corona effect runs through the whole cycle of the transmission system. The most obvious hazard is the loss of electrical energy. The loss of heat, light, and sound energy during discharge cannot be ignored. The loss of a 220kV line due to corona can reach 5% to 10% of the total loss. Long-term operation will cause huge energy waste and directly increase operating costs. The corona effect can also cause equipment corrosion. Ozone and nitrogen oxides generated by discharge will accelerate the aging of wires, insulators and other accessories. In humid or coastal areas, the corrosion rate of wires will even increase by more than 30%, increasing the frequency of maintenance and replacement. In addition, the electromagnetic radiation caused by the corona will interfere with peripheral communication equipment and precision instruments, and the night halo may also affect the ecological environment, which does not meet the development needs of green power.
Traditional methods of solving corona, such as increasing the cross-sectional area of the wire, polishing the surface, or adjusting the line spacing, are usually accompanied by high cost, difficult construction, and limited effect. And our corona ring coil starts from the root cause, adopts an annular arc structure, and is formed in one piece with high-strength alloy materials. The surface is polished and anticorrosive, which can effectively resist corrosion and deformation. The principle of corona ring coil is voltage equalization. After installing the corona ring coil on the wire joints, both ends of the insulator string and other electric field concentration sites, the locally concentrated electric field strength can be evenly dispersed to the surface of the corona ring coil ring body, so that the electric field strength has been lower than the air breakdown field strength, avoiding corona from the source.
In order to adapt to different scenarios, our corona ring coil has been optimized in multiple dimensions. Corona ring coil is made of high temperature resistant materials and lightweight materials, which can adapt to high temperature environments and have good corrosion resistance. And corona ring coil is not easy to age or deform, and can be used in a variety of harsh environments. In addition, corona ring coil adopts a preformed ring design structure, and the installation does not require complex tools or excessive manpower, which greatly reduces the investment of manpower and material resources.
For B-side buyers, choosing the right corona ring coil is the key to reduce losses and extend equipment life. Relying on accurate voltage equalization, strong environmental adaptability and convenient maintenance, our corona ring coil has become the trusted choice of many power companies. If you want to know more technical parameters, application cases or get a quotation, you can contact us through the company's official website or email.