The neutral point is grounded by the arc suppression coil and is also used as the resonant ground. It is mainly applied to the neutral point of the distribution network. It uses the inductive current generated by the arc suppression coil to cancel the capacitive arc current during single-phase short circuit, thus automatically eliminating the grid. In the event of an instantaneous single-phase earth fault, the arc can be extinguished in time, thus avoiding the expansion of the accident. The series of arc-extinguishing complete sets of equipment that our company has produced mainly include automatic-type automatic arc-extinguishing complete sets, volume-adjustable automatic arc-extinguishing complete sets, phase-controlled automatic arc-extinguishing complete sets, resistance grounding complete sets and fully digital intelligent arc-extinguishing devices. Dozens of products such as complete sets of equipment. It has the characteristics of stable and reliable product performance and advanced measuring methods. It has the most advanced anti-arcing coil secondary parallel resistance wire selection invention technology in the country, and the line selection accuracy is extremely high. According to the “three-layer two-net” structure, the digital arc-extinguishing The complete set of devices can realize the digitization, networking, information interaction, state visualization and function integration of the arc suppression coil.