In the safe and stable operation of high-voltage transmission lines, corona phenomenon is a potential danger that cannot be ignored. Corona phenomenon refers to the discharge phenomenon caused by the ionization of the air around the high-voltage charged body. It will not only cause power loss and electromagnetic interference, but may also accelerate the aging of equipment and affect the service life of transmission lines. As an important equipment for suppressing corona phenomenon, anticorona ring plays an important role in transmission lines by optimizing the distribution of electric fields and reducing local field strengths.
The application principle of anticorona ring on transmission lines is to optimize the electric field distribution by changing the shape of the electrode. In high-voltage transmission lines, the joints of the wires, insulator fittings and other parts are irregular in shape, which can easily form a local strong electric field and produce corona phenomenon. Anticorona ring adopts an annular or arc-shaped design, made of metal materials, and is fixed to areas prone to corona by bolts or clamps. When a high voltage voltage passes through the line, the anticorona ring can disperse the concentrated electric field strength, make the electric field distribution more uniform, and prevent the local field strength from exceeding the air breakdown field strength, thereby suppressing the generation of corona discharge from the source. This design neither affects the normal transmission function of the line, nor can it effectively reduce the negative effects of corona.
Anticorona ring assumes different protection tasks in different parts of the transmission line. In the connection parts of the wire, such as tension-resistant wire clamps, connecting tubes, etc., due to the shape mutation of the connection point between the wire and the metal fittings, it is easy to produce corona. Anticorona ring wraps the connection point here to passivate the sharp edges, making the transition of the electric field from the wire to the metal fittings smoother, which can reduce the probability of corona discharge. On the insulator string, anticorona ring is usually installed at the fittings at both ends of the insulator, especially in ultra-high voltage and ultra-high voltage lines, the insulator string is longer, and the electric field concentration of the fittings at both ends is prominent. Anticorona ring can effectively reduce the field strength of the metal surface and prevent problems such as aging of insulators and deterioration of insulation properties caused by corona.
In the process of practical application, the installation quality and late maintenance of anticorona ring will also affect the protection effect. During installation, it is necessary to make the anticorona ring and the line fittings firmly connected and the position is accurate to prevent abnormal electric field distribution due to poor contact or offset. During operation, anticorona ring also needs to be inspected regularly to check for deformation, corrosion, loosening and other problems, and to replace damaged parts in time.
In short, anticorona ring plays an important role in key parts such as wire connection and insulator protection of transmission lines through the function of optimizing the distribution of electric fields. However, the application of anticorona ring needs to be designed in combination with the environmental characteristics and voltage level of the line, and at the same time, installation and maintenance must be standardized.