Explosion hazardous places (environment), when electrical equipment must be set up, explosion-proof electrical equipment suitable for this hazardous area should be selected. Explosion-proof electrical equipment is generally designed after the product has met the basic technical requirements, and some explosion-proof measures are added to meet the explosion-proof requirements. Let’s learn about the protection principles and protective measures of explosion-proof electrical equipment.
Zhongtong Intelligent Positive Pressure Explosion-proof Room
1. Use shell to limit explosion and isolation ignition source
Use shell to limit explosion
Use shell to limit explosion
places the conductive part of the device in the outer shell, and the external combustible gas enters the shell through the gap between the mating surfaces of each component on the shell. Once ignited by the fault electric sparks of the conductive part on the internal electrical device, these mating surfaces will cool the flames and explosion products discharged from the inside of the shell to a safe temperature, and cannot ignite the explosive mixture around the outside of the shell, that is, the shell prevents the possibility of explosion propagation. Explosion-proofing uses explosion-proof shells to obtain safety characteristics. The performance of the explosion-proof shell includes explosion resistance and explosion-proof properties.
Explosion resistance: Explosion resistance refers to the strength of the shell. When the most serious explosive mixture explodes in the shell, or when the organic insulation decomposition in the shell is caused by high temperature to generate combustible high-pressure gas, its pressure will not cause the shell to deform or damage, and its high temperature will not cause the shell to be damaged.
Explosion resistance: Explosion resistance refers to the joint surface of each component of the shell, which must meet certain requirements, so that the flame or hot metal particles emitted outward when the shell explodes will not cause the explosion of the explosive mixture outside the shell.
Zhongtong Intelligent Mining Explosion-proof and Intrinsic Safety Electric Control Box
Isolate the ignition source with the shell
uses melting, extrusion or adhesive to seal the shell to prevent external combustible gas from entering the shell and isolate it from the ignition source to achieve the purpose of explosion-proof.
uses a shell with good sealing performance to limit the entry of combustible gases or vapors, so that the concentration of combustible gases or vapors accumulated inside the shell reaches the lower limit for a longer time than the time when combustible gases or vapors may exist in the external environment.
uses a shell with sealing performance that meets the specified requirements so that combustible dust cannot or is difficult to enter the shell, and isolate it from the ignition source to achieve the purpose of explosion-proof.
2. Control the electrical ignition source
01 Reduce spark, arc and high temperature
For electrical equipment that does not generate spark arcs and dangerous high temperatures during normal operation, some additional measures can be taken to improve the safety and reliability of the equipment, such as using high-quality insulating material , reducing temperature rise, increasing electrical gaps, creepage distances, improving the quality of wire connections, etc., thereby greatly reducing the possibility of sparks, arcs and dangerous high temperature phenomena, so that it can be used in dangerous places.
02 limits spark energy
By reasonably selecting electrical parameters, the electric spark generated by the system becomes quite small in normal or faulty state and cannot ignite the surrounding explosive mixture.
Zhongtong Intelligent Explosion-proof Hut Local
333 Isolate the ignition source with medium
The principle is to place the conductive parts of the electrical equipment in a safe medium, so that the ignition source is isolated from the explosive mixture outside to achieve the purpose of explosion-proof.
01 Isolate the ignition source with gas medium
Use When the medium used is gas (usually fresh air or inert gas), the gas inside the equipment should have a certain positive pressure relative to the outside atmosphere, thereby preventing the entry of the external atmosphere.
02 Isolate the ignition source with a liquid medium
The medium used is liquid (usually transformer oil ) as the isolation medium.
03 Isolate the ignition source with a solid medium
The medium used is generally a granular solid as an isolation medium, or the medium used is a solid filler, and the ignition source is cast and sealed into the filler and isolate it from the explosive mixture outside.
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