A gas dielectric capacitor is a device that stores charge and electrical energy, consisting of two electrodes made of close and insulated conductors. Power capacitors are used in power systems and electrical equipment. The size of the capacitor is determined by its geometric size and the characteristics of the insulating medium between the two plates.
The air medium variable capacitor is composed of a group of fixed stators and a group of movable rotors, and the insulating medium between the rotor and the stator is air. Since the rotating shaft is connected to the moving piece, the angle between the moving piece and the fixed piece can be changed by rotating the rotating shaft, so that the capacitance can be changed. When the moving blade is fully rotated from the fixed position, the capacitance is the smallest; when the moving blade is fully rotated to the fixed position, the capacitance is the maximum. The capacity of the capacitor depends on the distance between the two sets of pole pieces and the size of the pole piece area.
The structure of a capacitor is fairly simple, basically consisting of two electrodes and an electrical insulator between the electrodes. The internal electrodes of most capacitors contain non-conductive materials, or dielectrics. The basic model of a capacitor is to separate two metal sheets with a dielectric layer, and then process it into a cylindrical shape. . If a solid dielectric layer is placed between the electrodes, three functions will be produced: first, the two electrodes can be very close to each other without causing the problem of mutual contact; second, the general dielectric material will undergo dielectric breakdown when subjected to a large electric field. In the case of a dielectric break dowi, that is, a part of the ionized ions will pass through the dielectric layer that was originally an insulating material. Under a very strong electric field, the solid dielectric layer will not be destroyed; finally The capacitance of the capacitor is larger than the air between the two parallel plates due to the existence of the insulating material between the two parallel plates or in a vacuum. The reason is the insulating material, such as glass, paraffin, or polystyrene. The electric field between the parallel plates will cause induced charges on the surface of the insulating material.
Capacitors are divided into organic dielectric capacitors (including paint film capacitors, mixed dielectric capacitors, paper dielectric capacitors, organic thin film dielectric capacitors, paper film composite dielectric capacitors, etc.) according to different dielectric materials, and inorganic dielectric capacitors (including ceramic capacitors, mica capacitors, and glass films). Capacitors, glass glaze capacitors, etc.), electrolytic capacitors (including aluminum electrolytic capacitors, tantalum electrolytic capacitors, niobium electrolytic capacitors, titanium electrolytic capacitors and alloy electrolytic capacitors, etc.) and gas dielectric capacitors (including air capacitors, vacuum capacitors and inflatable capacitors, etc.).