LED explosion-proof lamp is a type of explosion-proof lamp. Its principle is the same as that of explosion-proof lamp, except that the light source is LED light source. It refers to various specific measures taken to prevent the ignition of surrounding explosive mixtures such as explosive gas environment, explosive dust environment, gas gas, etc. Measures of light fixtures. LED explosion-proof lamps are currently the most energy-saving explosion-proof lamps and are widely used in oil fields, power plants, chemical plants, petroleum and military units.
One of the very important explosion-proof principles of LED explosion-proof lamps is to limit the temperature of the shell surface, component surface or electronic component surface that is in contact with explosive gases and explosive dust, and to limit the temperature of the electrical contact surface to be lower than its minimum ignition temperature or ignition temperature. . LED explosion-proof lights used outdoors need to use waterproof drivers. LED explosion-proof lights used in gas stations need to be shockproof!
Classification of explosion-proof lamps
1. The explosion-proof category, level and temperature group of explosion-proof lamps are specified in national standards.
2. According to the explosion-proof type, it is divided into 5 main types: explosion-proof type, increased safety type, positive pressure type, non-sparking type and dust explosion-proof type. It can also be a combination or composite type and special type of other explosion-proof types and the above various explosion-proof types. .
3. According to the type of protection against electric shock, it can be divided into categories I, II and III. Anti-electric shock protection is to prevent the accessible parts of the explosion-proof lamp shell from becoming electrified, causing electric shock to the human body or generating sparks from contact with conductors of different potentials, which may ignite explosive mixtures.
Performance characteristics
■The light distribution of the lamp is unique, the illumination within the illumination range is uniform, and the illumination angle reaches 220 degrees, making full and effective use of light; the light is soft and has no glare, which will not cause eye fatigue to the workers and improve work efficiency.
■The light source adopts the brightest LED in the world, and the power consumption is only 40% of that of metal halide lamps.
■The key components of the power supply are all selected from the world’s top brands, which are efficient and stable.
■Adopts a unique heat dissipation structure and uses heat transfer and heat conduction methods to accelerate heat conduction, effectively ensuring efficient heat dissipation of the LED, so that the LED life can reach 100,000 hours.
■The explosion-proof type has the highest explosion-proof level and can be used in flammable and explosive places in various industries.
■Can be connected in parallel, eliminating junction box and installation costs.
■The shell adopts high-tech surface spraying technology, which is wear-resistant, corrosion-resistant, waterproof and dust-proof, and is suitable for various harsh environments.
■When using LED explosion-proof lamps as floodlights: add a condenser cover outside the light source surface to increase the irradiation of the floodlights.
■LED explosion-proof lights are used as explosion-proof lights in wineries: they should be designed with zone sealing; explosion-proof and intrinsically safe; protection grade IP65, anti-corrosion grade WF1, so as to be waterproof, dustproof and explosion-proof.
■LED explosion-proof lamps are used as explosion-proof lamps in oil fields: they should be designed with anti-fall rings; the oilfield derricks should be vibrated to prevent the lamps from falling due to the bolts falling off, and the anti-fall rings will protect them from falling.
What nameplate markings do explosion-proof lights have?
A explosion-proof mark.
B Basic mark: including product name, model, manufacturer name, registered trademark, date of manufacture, etc.
C performance safety mark: including rated voltage, current, nominal frequency, light source power and quantity, allowable ambient temperature (no mark is required when the range is only -20~+40℃), specific applicable environmental marks (if only applicable to a certain A product of an explosive gas mixture must be marked with the name or molecular formula of the flammable gas), the classification mark of the lamp (such as “number”), etc.
D explosion-proof certificate number, proving that the product has passed the formal inspection by the explosion-proof inspection station. Some products have an “x” symbol after the explosion-proof certificate number, which indicates that the product can only be used under certain special safe use conditions. The specified conditions should be clearly and eye-catchingly stated on the lamp casing or product manual.
DAdditional instructions. In addition to the above markings, detailed instructions necessary to ensure correct installation, use and maintenance shall be given on the luminaire, on the built-in ballast, or in the manufacturer’s product instructions supplied with the luminaire.
Explosion-proof light wiring instructions
1. Location selection
Electrical wiring should be laid at a location where the risk of explosion is less or farther away from the release source.
2. Selection of laying method
Electrical circuits in explosive hazardous environments mainly include explosion-proof steel pipe wiring and cable wiring.
3. Isolation and sealing
When the trenches for laying electrical lines and protective pipes, cables or steel pipes pass through partition walls or floors between areas with different levels of explosion hazard environments, they should be tightly blocked with non-combustible materials.
4. Wire material selection
Within the scope of explosion hazardous environment hazard level 1 zone, copper core wires or cables should be used for distribution lines. Where there is severe vibration, multi-stranded copper core soft wires or multi-stranded copper core cables should be used. Aluminum core power cables are not allowed to be used underground in coal mines.
Within the scope of explosion hazardous environment hazard level 2 zone, power lines should use aluminum core wires or cables with a cross-sectional area of 4mm2 and above, and lighting lines can use a cross-sectional area of 2.5mm2. and above aluminum core wires or cables.
5. Allowable carrying capacity
For the selection of zone 1 and zone 2 insulated conductor cross-sections and cable cross-sections, the allowable current carrying capacity of the conductor should not be less than 1.25 times the rated current of the fuse melt and the set current of the long-time overcurrent release of the circuit breaker. The allowable ampacity of the branch line leading to the low-voltage cage induction motor shall not be less than 1.25 times the rated current of the motor.
6. Connection of electrical circuits
The intermediate joints of electrical circuits in Zones 1 and 2 must be inside an explosion-proof junction box or near the junction box that is suitable for the hazardous environment. Zone 1 should use a flameproof junction box, and Zone 2 can use an increased safety junction box.
If aluminum core cables or wires are used for electrical circuits in Zone 2, they must be reliable to facilitate correct installation and maintenance by users.