Corona ring coil is an important component to suppress the distortion of high-voltage electric fields. It can achieve uniform distribution of electric fields by optimizing the electrode structure, effectively preventing energy loss, equipment corrosion and electromagnetic interference caused by corona discharge. The application scenarios of corona ring coil cover many fields such as power systems, rail transit, and communications engineering, and it has the effect of ensuring the safe operation of equipment and improving the energy efficiency of the system.
In the field of high-voltage transmission, the insulator strings, wire connection fittings and other parts of overhead transmission lines are prone to corona due to the concentration of electric fields, especially in lines with voltage levels of 110kV and above, corona discharge can cause power loss, radio interference and audible noise pollution. By increasing the radius of curvature of the electrode, corona ring coil can control the field strength below the air breakdown field strength and reduce the incidence of corona.
The application of corona ring coil in the field of rail transit focuses on catenary systems and vehicle electrical equipment. The catenary wires of subways and high-speed rail rub against the pantograph during high-speed operation, causing wear and tear, and local tips or burrs will form. At 25kV power frequency voltage, it is prone to corona discharge, which will not only interfere with the communication signal of the train, but also accelerate the oxidation and corrosion of the contact line. The corona ring coil installed at key nodes such as the wrist arm and locator of the catenary can disperse the electric field through a smooth transition arc structure, reducing the corona interference intensity of the catenary to the national standard limit.
In communication base stations and radio and television towers, corona ring coil is an important component to ensure the quality of signal transmission. If corona discharge occurs at the feeder terminal of the transmitting antenna, the lightning arrester interface, etc., it will produce wide-band electromagnetic interference, resulting in a decrease in the signal-to-noise ratio and a shortening of the transmission distance. After installing the frequency-adapted corona ring coil, the interference level can be reduced by more than 20dB, which can significantly improve signal stability.
In corrosive environments such as chemical industry and mining, corona ring coil requires special materials and processes. For example, for transmission equipment in coastal areas, corona ring coil needs to be made of 316 stainless steel or titanium alloy, and the surface is passivated to resist salt spray corrosion. High-pressure equipment underground in coal mines needs to use intrinsically safe corona ring coil to ensure that no sparks are generated in flammable and explosive environments. The corona ring coil in the field of lightning protection also has a unique design. After installing corona ring coil on the top of the lightning rod's flasher, it can avoid the phenomenon of early lightning caused by tip discharge in normal weather, and at the same time allow the current to drain smoothly when a lightning strike occurs, reducing the electromagnetic impact on the surrounding equipment. This type of corona ring coil is usually designed in conjunction with the grounding system to form a complete lightning protection system.
In short, the application effect of corona ring coil depends on the selection adaptability and installation quality, and it also needs to be customized in combination with the voltage level, environmental parameters and equipment characteristics of specific scenarios.