Lightning protection devices refer tooverhead terminals, down conductors, grounding devices,protective devices against surge(SPD) and other connecting conductors.
Lightning protection classification
1) Category 1: Manufacture and storage of pyrotechnic articles, etc., causing explosions due to sparks, causing d 'huge damage and human losses with 0; Buildings located in areas or 20 locations at risk of explosion.
2) Category 2: National units of key cultural relics; national-level buildings and large-scale buildings; National Special Level and Class A Hazardous Stadiums that manufacture and store explosives and their products; electrical products and sparks. It is unlikely to cause an explosion or cause huge damage and loss of life.they.
3) The third category: In addition to the first and second categories, this is the third category.
Lightning protection construction
1. Voltage Equalization Ring
The voltage equalization ring is a horizontal lightning protection ring around the perimeter of the building designed to prevent lateral lightning. strikes in high-rise buildings bring. In architectural design, when the height exceeds the radius of the rolling ball (30 meters for the first category, 45 meters for the second category and 60 meters for the third category), a pressure equalization ring is installed every 6 meters . In terms of design, the pressure balance ring can be welded into a closed ring using two main bars in the ring beam. This closed ring must be connected to all down conductors.
2. Lightning rods
General rules for ininstallation of lightning rods are: the highest points and prominent points, such as roof ridges, corners of eaves and corners of parapets of flat roofs.
Electromechanical equipment includes: lightning protection devices, lightning induction, electromagnetic compatibility, protective grounding,< /strong>surge protectors.
1. Lightning protection device: The sum of overhead terminals, down conductors, grounding devices, surge protectors and other connecting conductors.
2. Lightning induction: When lightning discharges, electrostatic induction and electromagnetic induction are generated on nearby conductors, which can cause sparking between metal parts.
3. Electromagnetic Compatibility: The equipment or system has the ability tooperate normally in the electromagnetic environment without causing unacceptable electromagnetic interference to anything in the environment.
4. Protective earthing: Connect the exposed conductive parts of the electrical appliance which are not loaded when normal to the protective wire or protective neutral wire depending on the type of system earthing, called grounding to the protective earth.
5. Surge protector: A device with nonlinear characteristics used to limit the conduction of transient overvoltages and overcurrents in lines and exhibiting nonlinear characteristics.
Detailed information:
Mechanical and electrical equipment: fans.
A fan is a machine that relies on supplied mechanical energy to increase gas pressure and exhaust the gas. This is an ent fluid machinerained. Fan is the usual abbreviation for gas compression and transportation machines in China. Fans generally include ventilators, blowers and wind turbines.
Fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and draft induction of industrial boilers and furnaces, and domestic cooling; and ventilation of electrical equipment; drying and sorting of grains, wind sources in wind tunnels and inflation and propulsion of hovercraft, etc.
Baidu Encyclopedia-Electromechanical equipment (mechanical and electronic technological equipment)