The three common forms of electrostatic discharge [Daily Question 20090407]

Corona discharge, brush discharge, spark discharge.

Corona discharge, brush discharge, spark discharge.

　There should be four types of electrostatic discharge: The form of electrostatic discharge is related to the geometric shape of the charged object, the voltage, and the material of the charged object. Forms of electrostatic discharge: (1) Corona discharge: It is a type of partial discharge that occurs at the tips of charged objects or in areas with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. 　　(2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Multiple brush discharges or propagating brush discharges can occur on the same insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. 　　(3) Spark discharge: It is a single-channel discharge that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high. 　　(4) Thunderstorm discharge: It is a lightning-like discharge formed by large-scale, high-density charged particles suspended in space. Its ignition risk is very high. This post was last edited by fanxh on 2009-4-7 08:47.]

There are basically two types of electrostatic discharge: corona discharge and spark discharge. Corona discharge is a form of self-excited discharge that occurs at atmospheric pressure. Generally, because the radius of curvature of the surface of the two electrodes (or one of them) is very small, the electric field in the discharge gap is uneven, resulting in the ionization and emission of light from the gas near the electrodes. If the voltage between the poles continues to increase, the corona discharge will develop into a spark discharge ； If it continues to increase, the spark discharge will develop into an arc discharge.

Electrostatic discharge: The transfer of static electric charge between two objects with different electrostatic potentials, caused by direct contact or induction by an electrostatic field. Electrostatic discharge is the phenomenon in which, when the energy of the electrostatic field reaches a certain level, it breaks down the medium between them, resulting in discharge. The form of electrostatic discharge is related to the geometric shape of the charged object, the voltage, and the material of the charged object. Forms of electrostatic discharge: (1) Corona discharge: It is a type of partial discharge that occurs at the tips of charged objects or in areas with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. 　　(2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Multiple brush discharges or propagating brush discharges can occur on the same insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. 　　(3) Spark discharge: It is a discharge with a single path that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high. 　　(4) Thunderstorm discharge: It is a lightning-like discharge formed by large-scale, high-density charged particles suspended in space. Its ignition risk is very high. 　　

Corona discharge, brush discharge, spark discharge.

There should be four types of electrostatic discharge: The form of electrostatic discharge is related to the geometric shape of the charged object, the voltage, and the material of the charged object. Forms of electrostatic discharge: (1) Corona discharge: It is a type of partial discharge that occurs at the tips of charged objects or in areas with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. 　　(2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Multiple brush discharges or propagating brush discharges can occur on the same insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. 　　(3) Spark discharge: It is a single-channel discharge that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high. 　　(4) Thunderstorm discharge: It is a lightning-like discharge formed by large-scale, high-density charged particles suspended in space. Its ignition risk is very high.

GB12158-2006 \"General Guidelines for Preventing Static Electricity Accidents\" identifies four types: 1. Corona discharge, 2. Brush discharge, 3. Spark discharge, 4. Propagating brush discharge. This post was last edited by dongzhao on 2009-4-7 at 09:48.]

Corona discharge, brush discharge, spark discharge

1) Corona discharge: It is a type of partial discharge that occurs at the tips of charged objects or in areas with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. (2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Multiple brush discharges or propagating brush discharges can occur on the same insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. (3) Spark discharge: It is a discharge with a single path that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high.

In practice, there are many sources of static electricity, and there are also various forms of discharge. However, through research on the main sources of static electricity and the actual processes of static discharge, it has been found that the three primary modes responsible for damaging electronic components are static discharge from charged persons, discharge from charged machines, and discharge from charging devices. 1. Discharge mode of a live human body (HBM): Since the human body comes into contact and friction with various objects as well as with electronic components, it tends to accumulate static electricity, which can cause damage to those components. It is generally believed that most electrostatic damage to components is caused by human body static electricity. There are two types of discharge between the human body and the object being discharged. That is, contact discharge and arc discharge. During contact discharge, the resistance value between the human body and the object being discharged remains constant. Arc discharge occurs when there is a certain distance between the human body and the object being discharged; the electric field strength in the space between them exceeds the dielectric strength of the medium (such as air), causing the medium to ionize and resulting in an arc discharge, with an arc of light visible in a dark environment. A characteristic of arc discharge is that, in the initial stage of the discharge, since air is a poor conductor, the impedance of the discharge path is high, resulting in a low discharge current ； As discharge proceeds, the channel temperature rises, leading to local ionization; the channel impedance gradually decreases and the current increases until it reaches a peak value ； Then, as the static electricity energy in the human body is released, the current gradually decreases until the arc disappears. 2. Discharge modes of charged machines Machines can also become charged due to friction or induction. Charged machines can also suffer damage due to discharge through electronic components. Machine discharge model (Machine Model). Compared to the human body model, machines have no resistance, while their capacitance is relatively higher. 3. Discharge model of charging components During the processes of component assembly, transfer, testing, inspection, transportation, and storage, friction between the casing and other materials causes the casing to accumulate static electricity. Once the component leads are grounded, the housing will discharge to ground through the core and the leads.

There are also various forms of static electricity, and human body static discharge takes on the following three forms； (l) Contact discharge between human bodies. ⑵Discharge occurs between the human body and the metal grounding electrode. ⑶The human body discharges electricity through its feet.

1) Corona discharge: It is a type of partial discharge that occurs at the tips of charged objects or in areas with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. 　　(2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Multiple brush discharges or propagating brush discharges can occur on the same insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. 　　(3) Spark discharge: It is a single-channel discharge that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high. 　　(4) Thunderstorm discharge: It is a lightning-like discharge formed by large-scale, high-density charged particles suspended in space. Its ignition risk is very high.

The form of electrostatic discharge is related to the geometric shape of the charged object, the voltage, and the material of the charged object. (1) Corona discharge: It is a partial discharge that occurs at the tip of a charged body or in the vicinity of a location with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. 　　 (2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. 　　 (3) Spark discharge: It is a discharge with a single path that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high. 　　(4) Thunderstorm discharge: It is a lightning-like discharge formed by large-scale, high-density charged particles suspended in space. Its ignition risk is very high.

Types of electrostatic discharge: (1) Corona discharge: It is a type of partial discharge that occurs at the tips of charged objects or in areas with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. (2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Multiple brush discharges or propagating brush discharges can occur on the same insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. (3) Spark discharge: It is a discharge with a single path that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high. (4) Thunderstorm discharge: It is a lightning-like discharge formed by large-scale, high-density charged particles suspended in space. Its ignition risk is very high.

Corona discharge, brush discharge and propagating brush discharge, spark discharge, lightning-like discharge.

Corona discharge, brush discharge, spark discharge

In addition to being dissipated through electrostatic discharge, it is also eliminated in the form of electrical discharges; when static electricity accumulates to a certain level, it will discharge in space. There are three forms of spatial discharge, namely corona discharge, brush discharge, and spark discharge. For oil depots, the probability of harm caused by corona discharge energy is also low ； Brush discharge has a higher probability of serving as a ignition source and causing electrostatic shocks compared to corona discharge ； Spark discharge has high energy, increasing the likelihood of static electricity hazards; it is the main ignition source for static electricity-related fires in oil depots. The hazards of static electricity are caused by the mechanical effects and discharge phenomena associated with static electricity; the accumulated electric charge creates an electric field that exerts electrical forces on the surrounding space. The most serious hazard of static electricity is its discharge, which can cause the combustion or explosion of flammable gases. Oil depots can pose a significant threat to the equipment, facilities, and personnel involved in the storage and transportation of oil products.

Electrostatic discharge basically consists of corona discharge and spark discharge

Types of electrostatic discharge: (1) Corona discharge: It is a type of partial discharge that occurs at the tips of charged objects or in areas with a very small radius of curvature. Corona discharge may be accompanied by a slight hissing sound and a faint pale purple light. Corona discharge generally poses no ignition risk. (2) Brush discharge and propagating brush discharge: both are acousto-optic, multi-branched discharges that occur on the surface of insulators. When the back side of the insulator is in close contact with a metal conductor, propagating brush discharge will occur on the front side of the insulator. Multiple brush discharges or propagating brush discharges can occur on the same insulator. Brush discharge poses a certain risk of ignition ； Propagating brush discharge poses a high risk of ignition. (3) Spark discharge: It is a discharge with a single path that occurs between charged bodies. Spark discharge produces a bright flash and a brief popping sound. Its ignition risk is very high. (4) Thunderstorm discharge: It is a lightning-like discharge formed by large-scale, high-density charged particles suspended in space. Its ignition risk is very high.