KMC air insulated enclosed bus duct

KMC air insulated enclosed bus duct

comply withGB7251.2TheJB/T9662andJB/T10327Meet the requirements of standards and industry standards. When the shell is sprayed with fire-resistant coating, in the event of a fire3~5Within minutes, the coating begins to foam and expand, forming an insulation layer that effectively reduces heat transfer,And all the openings are closed,Prevent water from entering during firefighting and causing bus short circuits,Ensure normal power supply. The conductor copper bar wrapped with mica tape has good high temperature resistance and combustion resistance, and has good flexibility and dielectric properties under normal conditions. A safety protection baffle is designed at the insertion hole, and the plug-in box can only be connected when the baffle is opened, effectively preventing dust and foreign objects from entering the socket, thereby improving the protection of the busbar duct, preventing misoperation, and greatly improving the safety of the busbar. The protection level of the shell isIP66According to system requirements, plug-in interfaces can be set at any position in the bus duct, which is fast to install, easy to tap, and safe to use

Main technical parameters: rated voltage:660VRated frequency50Hz(or60Hz)Insulation resistance value:The insulation resistance of each busbar trunking unit should be greater than or equal to20Megaohms, users should check the insulation resistance value before installation. Insulation strength, each section of busbar trunking unit undergoes testing before leaving the factory50Hz3750V/MinThe power frequency withstand voltage test adopts connector connection, one of which is a common type, designed to be locked with insulation bolts; Another approach is to adopt the current universal excellent single arm bolt locking design, which only requires a torque wrench device to lock the high-strength bolt on one side, without the need for other auxiliary tools. Please refer to the torque values specified for each specification of bolt. The connector can also be equipped with a single arm double headed torque bolt. When the locking torque reaches a fixed value, one end of the bolt will automatically fall off, and the other end of the bolt will be left for future maintenance or disassembly, without the need for a torque wrench during operation. Any damage or detachment of a supporting component can cause significant accidents. After the installation of the busbar trunking, it is necessary to check the current carrying capacity of the busbar trunkingIPProtection level, insulation resistance.

The traditional protective earth wire PE line is placed on one side of the bus duct. Due to electromagnetic induction, the fault current induced on the protective earth wire is 50% higher than calculated by actual measurement. At the same time, the distance between the three-phase conductive rows and PE is uneven, and the inductance is also uneven. In Zhaotong Bus duct factory, when the line is long, the three-phase is severely unbalanced under fault current. Using non-magnetic material aluminum alloy shell with good conductivity as the protective ground wire, it is surrounded by the conductive busbar. Due to its proximity to the three-phase busbar as much as possible, the reactance can be minimized, and the distance between the protective ground wire and the three-phase busbar is equal, with the same reactance. In this way, whether it is a short-term or continuous relative ground short circuit fault, this grounding method is better than setting up a separate PE row

Bus duct systems have the advantage of longer service life compared to cables, generally reaching30-50Year. To extend the lifespan of the busbar trunking as much as possible, the installation bracket of the busbar must also be considered. When installing bus ducts in a horizontal plane, lifting brackets or gantry brackets are generally used. In vertical shafts, a combination of spring brackets and angle iron brackets is generally used for installation. When purchasing large capacity busbars, careful consideration should be given to the materials of the brackets, suspension arms, crossbeams, springs, and loads. Aluminum profile shell undergoes anodizing10uThe anti-corrosion performance of post galvanizing is much better than that of steel shells. Long term atmospheric exposure tests on different grades of aluminum alloy sheets and galvanized copper sheets in Japan have shown that the corrosion depth of the former is about one twentieth of that of the latter. Reliable insulation method: There is an insulation layer on the conductive strip, and there is a certain air gap between the phases. There is also a gap between the conductive strip and the outer shellDMCMaterial pressed insulation pad, triple insulation, ensuring the insulation of the bus duct*Especially when used in humid environments, its durability is more pronounced.

KMC air insulated enclosed bus duct

Using non-magnetic material aluminum alloy shell with good conductivity as the protective ground wire, surrounding the conductive busbar as close as possible to the three-phase busbar,CMC-2500AAluminum alloy bus duct can achieve reactancezuiSmall, and the distance between the protective ground wire and the three-phase busbar is equal, with the same reactance. In this way, whether it is a short-term or continuous relative ground short circuit fault, this grounding method is better than setting it separatelyPEArrange well. Therefore, the Electrical Technology Committee has announced and advocated for wire transfer arrangements(busway)Use the casing as a grounding conductor. Bus duct cables need to be tapped on site, which has poor reliability. The installation of aluminum alloy bus ducts, even prefabricated branch cables, has obvious disadvantages, mainly requiring customization from the factory. The brand of aluminum alloy bus duct adopts an open branch connection method“C'Type clamp, after a long time, can the tightening force be guaranteed for the Yuanyang aluminum alloy bus duct? Due to the high cost of each branch head, prefabricated branch cables are still not widely used today. Any floor needs to cut off the power supply, and the bus duct does not need to be powered off. As long as the aluminum alloy bus duct is unloaded, the plug-in box of the bus duct can be removed. But it is very dangerous to cut off the branch power supply of the prefabricated branch cable while it is live. The surface treatment of the conductive enclosed busbar shell is an important task, which includes processes such as acid washing, phosphating, drying, powder coating, and curing. The shell coated with polyester epoxy powder has strong surface adhesion and can maintain insulation for a long time.

Check the voltage of all incoming terminals of the aluminum alloy bus duct and verify whether the power supply of the bus duct has been cut off. 2. Regularly use a soft brush. Clean the dust on the bus duct with a vacuum cleaner or cotton cloth. 3. Check that the total load current of the aluminum alloy busbar trunking does not exceed the main busbar current or design current. Check the temperature of the operating site. 4. Check if the connecting bolts of the aluminum alloy busbar trunking are loose within 3 months of installation and use. Inspect after 1 year, and conduct internal and external inspections every 3 years for the rest. 5. Pay special attention to the clamping torque and surface cleanliness of the connector. Loose or contaminated structures can cause increased resistance and overheating. Even arc light may occur due to uneven connection surfaces. 6. Check for missing, broken, rusted, or excessively worn bus duct components, and ensure that the springs have appropriate tension and free extension. If any abnormalities are found, they should be replaced immediately. 7. During the operation of the aluminum alloy busbar trunking, constantly check for potential moisture from sprinkler equipment, pipelines, roofs, and other sources, as well as any other heavy objects that may pose a threat to the system; Is there any water droplet falling on the bus duct; Is there any heat source that affects the temperature of the bus duct. 8. Before re powering the aluminum alloy busbar trunking system, the insulation resistance should be checked and recorded for archiving. 9. Ensure the original protection level requirements of the aluminum alloy busbar trunking system after maintenance.

Conductive copper bars - composed of pure copper bars, the surface of the conductive copper bar joints should be uniformly plated with tin or silver. (2) Insulation material--Composed of high-strength insulating plastic blocks made of polytetrafluoroethylene and polycarbonate.(3)Fixed bolts, insulation sleeves, and cover plates, as shown in the figure1As shown. The installation site of enclosed busbar should not exceed the altitude2000mThe ambient air temperature is not higher than+40℃Not less than−5℃, in24The average temperature of the product within the hour shall not exceed+35℃The relative humidity of the air is40℃Time not exceeding50%In20℃Time not exceeding90%The surrounding air is clean and dust-free, and the gas in this series of products can ensure a certain period of power supply even in the event of a fire. Mainly used in densely populated public places such as high-rise buildings, subways, and other places with high fire safety requirements.