Electrostatic discharge type
There are various forms of electrostatic discharge, and different anti-static devices such as anti-static workbench, anti-static tool cart, anti-static tool cabinet, etc. are selected for different discharge forms.
Corona discharge
Corona discharge, also known as tip discharge, is a form of discharge that occurs in a highly inhomogeneous electric field where the air is locally ionized. To induce corona discharge, it is usually required that the electric field near the electrode or the charged body is strong. Corona discharge is a discharge process in which a high potential, a small current, and air are locally ionized. Corona discharge is widely used in industrial production. Corona discharge technology is used for electrostatic dust removal, electrostatic separation, and static elimination in antistatic places.
2. Spark discharge
When a static conductor with a relatively high electrostatic potential is close to a ground conductor or a relatively large conductor, a static spark discharge is caused. Electrostatic spark discharge is a transient process in which the air between the two discharge bodies is broken down, accompanied by a popping sound of "噼啪". The popping sound is caused by a pressure shock wave formed by a sharp rise in the air temperature in the spark passage. When a static spark discharge occurs, the electrostatic energy is instantaneously released in a concentrated manner, and its ignition and detonation ability are strong. In addition, the discharge current generated by the electrostatic spark discharge and the electromagnetic pulse generated by it have a large destructive force, which may cause damage to some sensitive electronic devices and equipment. It should be noted that the electrostatic spark discharge generated by the charged metal conductor is not exactly the same as the electrostatic spark discharge generated by the charged body. In most cases, the electrostatic spark discharge between the metal conductors forms a spark channel that releases most of the electrostatic charge, ie, the electrostatic energy can be concentrated. For the static discharge of the human body, since the impedance of the human body changes with the change of the electrostatic potential of the human body, a single spark discharge process may involve multiple formation and disappearance of the spark passage, that is, repeated discharge. Only a portion of the electrostatic charge is released during each discharge, that is, only a portion of the human body's electrostatic energy is released at a time.
3. Brush discharge
The discharge tends to occur between the conductor and the charged insulator, which may be a solid, gas or liquid of low conductivity. The discharge channel formed when the brush-shaped discharge is generated is concentrated at a certain point on one end of the conductor, and has more bifurcations at one end of the insulator, and is distributed in a certain spatial range. This discharge is called a brush discharge according to the shape of its discharge channel. When the polarity of the potential of the insulator with respect to the conductor is different, the energy generated by the brush discharge formed by the insulator is different from the discharge region and shape generated on the insulator. When the insulator is at a positive potential with respect to the conductor, the discharge region generated on the insulator is uniformly rounded, the discharge area is relatively small, and the energy released is relatively small. When the insulator is at a negative potential with respect to the conductor, the discharge region generated on the insulator is an irregular star-shaped region, and the area is relatively large, and the energy released is also large.
In addition, the brush discharge is also related to the linearity of the participating discharge conductors and the surface area of the insulator. Within a certain range, the larger the conductor linearity, the larger the charged area of the insulator, and the greater the energy released by the brush discharge. In general, the brush-shaped discharge releases a high amount of energy, so it can ignite and detonate most of the combustible gas.