Basic method of arc extinguishing - Solutions - Huaqiang Electronic Network

Probe domestic switch needle KG-300K, with a needle head diameter of 3.0mm, is a normally open switch needle used in various industrial applications.

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM — a high-frequency crystal component commonly used in communication devices and control systems.

Photocoupler — an electronic device that transfers electrical signals between two isolated circuits using light, ensuring safety and noise reduction.

1. The method of pulling and arcing helps accelerate the separation of contacts when a switch is turned off. This causes the arc to stretch rapidly, reducing the electric field strength between the contacts. As a result, the arc may no longer be able to sustain itself, leading to its extinction. a. Arc blowing using gas involves directing a flow of cold insulating medium—either parallel or perpendicular to the arc—to quickly spread and cool the arc, aiding in its extinction. b. Multi-break arc suppression is commonly used in high-voltage circuit breakers, where multiple breaks per phase divide the arc into smaller segments. This increases the resistance of the arc gap, improves the recovery of dielectric strength, and reduces the voltage across each break, making arc extinction more efficient. c. Vacuum arc suppression takes advantage of the high insulation strength of vacuum. When the current crosses zero, the arc is extinguished as metal vapor from the contacts disperses quickly, preventing re-ignition. d. Dividing the arc into multiple short arcs by using an arc chute made of insulating plates and metal grids can help achieve the new cathode effect. At the moment of current zero-crossing, the dielectric strength across each grid prevents the arc from reigniting, allowing for effective arc extinction. e. Slit arc suppression uses organic solid materials or ceramic grids. When an arc forms, it is drawn into the slit by magnetic forces, cooled, and eventually extinguished. The decomposition of the material under heat also contributes to rapid cooling and arc extinction. 2. Cooling methods reduce the temperature of the arc, slowing down ion movement and weakening the heat release effect. This enhances the recombination of ions, which supports the arc’s extinction. The lower the temperature, the stronger the recombination effect, and the easier it becomes to extinguish the arc. This principle is crucial in designing efficient and safe electrical switching systems.