The Busway system shows superiority over traditional cables in terms of safety, reliability, longevity and aesthetics. It is a standard solution for the reliability and economic requirements of modern constructions.

Watching: What is a Busway

Today, most of the buildings such as high-rise buildings, apartments, factories or data centers with large consumption capacity have switched to using Busway. Busway system shows its superiority over cable. tradition of safety, reliability, longevity and aesthetics. This is a standard solution for the economic and reliability requirements of modern buildings. BUSDUCT TRUNKING SYSTEM I. General information: 1. Busway: In essence, busway busway, used to replace electric cables, but made in the form of hard-sheathed bars and conductors converted to copper or aluminum cores, coated with materials. insulating material. The busbars have a maximum length of 3 m, are connected by connectors, and may or may not have a location to receive power depending on the design and installation location in the building.

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The design of busbars in the building can have many types of shafts, but in general there are 3 types as follows: – Connection from Transformer to main distribution cabinet (LV Panel) (horizontal rise) – Connection from Generator to cabinet main distribution board ( LV Panel ) ( horizontal rise )- The busbar shaft from the distribution cabinet to the floors ( vertical rise )- In addition, there may be branches (using T connections)

2. Outstanding advantages of busbars compared to cables:- Very large electrical conductivity, can be up to 6300A, 7500A- Low loss and ability to extract electricity from 1 axis of the busbar at many other locations. together on the busbar- High aesthetics, and saving installation space, saving the area of ​​the main power distribution cabinet.- Finally, with a certain operating current level (1000A for aluminum core, From 1250A or 1600A or more for copper core), the entire usage cost for Busway, will be cheaper than using traditional power cables.3. Manufacturers in the world and Busway selling in Vietnam:

In the world, busbars have been widely used since the 80s in Europe, America, Japan, and Korea. There are hundreds of professional busway manufacturers, but in general, only the following companies are well-known and have products that are widely sold around the world: 1. Schneider with 18% global market share2. Siemens closely follows with 15% of the world market share3. LS Cable (Korea) is in 3rd place with 12% of the global market share,4. GE with 11% market share,5. Cutler Hammer (Eaton) is mainly sold in developed countries with a market share of less than 10%. In Vietnam market, there are currently 8 main Busway suppliers entering Vietnam, and the order of market share in Vietnam in 2008 is equivalent are LS Cable – market share of 27% (manufactured in HQ), Siemens – market share of 25% (manufactured in Vietnam), Schneider – market share of 23% (manufactured in China). These three firms account for 75% of the entire Vietnamese market share. The remaining 5 firms are GE (made in China), PPB, Henikwon, Translite, Megaduct. The most prominent feature is that global firms all use aluminum busducts while 3 out of 4 Malaysian firms use iron (referred to as is metal shell). All global brands have 1s, 3s short circuit test at high level (max 150, 200KA). while firms from Malaysia have this test level much lower, even some firms only test 6 Cycle, 3 Cycle (6 cycles – 0.1s, 3 cycles -0.05s). (Based on the catalog), there is no 1s, 3s test. GE/SIEMENS/SCHENIDER firms do not offer to sell Busway made in the US and Europe to Vietnam, but offer the type manufactured from China to Vietnam due to the structure of the company. firms. These companies manufactured in the US use Epoxy technology, while those produced in Asia use Mylar (A type of film produced by Dupont company made into rolls like tape, and rolled into a conductive core in the busbar.) Please refer to the catalogs of manufacturers in the US and made in Asia.) (Note: only Schenider retains Mylar technology in the US, while still producing Epoxy. in the US to meet the cost-cutting requirements of buyers upon request) II.Manufacturing features:1. Shell structure:Aluminum case: LS Cable, GE USA, GE China, Siemens Vietnam, PPBLS Cable and GE made in the US use powder coated 2-piece aluminum die-cast housing. The rest use 4-piece aluminum housing.When connecting, 2-piece aluminum case requires two rows of screws and 4-piece aluminum case requires 4 rows of screws. screws or rivets for fastening.

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The world’s only 2-piece die-cast aluminum case is only made in the US by LS Cable and GE (GE made in China uses 4-piece aluminum housing). In principle, when making 4 pieces, it will be very easy, but because it has to be connected to 4 rows, it is not sure with a 2-piece aluminum case (only need to connect 2 rows). Currently, the world’s leading brands Siemens, LS Cable, GE, Cutler Hammer have all switched to aluminum shell technology from 5-6 years. Iron shell: including Henikwon, Translite, Megaduct Aluminum + Iron shell: Schneider (made in China). ), offered for sale in Vietnam. 2 pieces of aluminum + 2 pieces of iron. Due to the superiority of aluminum shells compared to iron shells, big companies have removed iron shells, but made aluminum shells from 5-6 years now. Because:- Iron is much heavier than aluminum, so when hanging, aluminum-shell conductors are safer.- Iron emits less heat than aluminum, so when using iron shells, the busbar system is hotter and loses more energy, rated current is reduced compared to design.- Iron is much less conductive than aluminum, should use iron shell as grounding terminal, will only be able to reach 50%E maximum. While using an aluminum case, it gets above 100% E.2. Conductive core structure: Conductive core, in principle, can only be aluminum (AL) or copper (CU), purity up to 99.99%. Copper’s characteristic is that its conductivity is greater than 99%, aluminum is 63-67%, so in return, when using Aluminum, must use rods with larger cross-section (but still lighter, and cheaper, when the same operating line). So between Copper and Aluminum, customers should choose the type. Before, due to the habit of using Power Cables, most customers in Vietnam used Copper, from the end of 2007 until now, due to updating world market information, the number of projects using Aluminum Busduct increased significantly. With copper cables having ductility, so it’s malleable, and with busbars, there’s no need to bend, so using aluminum cores in commercial buildings is the most suitable, because the size is insignificantly larger, but the price is generally cheaper. 30% – 50% (depending on the accessories that come more or less, because the labor cost of the accessories is generally the same for both Copper Busway and Aluminum Busway). So when to use Copper conductor? The output has classified works that should use copper as: Hospitals, data centers, semiconductor factories, research and high-tech centers, etc. And all commercial buildings should use Aluminum due to its efficiency and cost savings, longevity Assured as copper conductor. In addition, due to manufacturing characteristics, some companies only have bus duct Aluminum up to 4000A, not 5000A, or 6300A, in this case, it is often recommended to use Copper to avoid compete with other firms when the other firms have large aluminum busducts (customers do not benefit from offers like this, but have to pay very high prices for copper busducts when using large operating currents). , Japan, Europe, almost 100% of commercial buildings use Aluminum, which is both 30% cheaper and lighter, but the loss compared to Copper is negligible, the pressure drop is almost the same.3. Construction of insulating materials: This is a controversial issue among manufacturers, and every manufacturer says their own type is the best. According to IEC 60439-1/2, the temperature of the busbar are not allowed to exceed 95 degrees Celsius (and must not exceed 55 degrees Celsius on the background of ambient temperature, and also not exceed 90 degrees Celsius). All brands use insulating materials that exceed this standard: Therefore, using a common heat-resistant material of 130 degrees Celsius is far beyond the IEC standard. In addition to heat resistance, different types of materials have other properties. Polyester 130 degrees C, Mylar 150 degrees C, Epoxy from 130-170 degrees C (depending on additives). Conductive bars were used starting around 1980. At that time the insulating material was Polyester (large version, then folded). again, apply duct tape). but can be used well for Europe, Korea, Japan (air humidity is lower than 60%). After that, Dupont Corporation of the US produced Mylar material for companies to use to roll up magnetic 2 busbars. -3 layers. This material reduces the moisture content of the guide rails. However, due to the nature of this material, the insulation is not high (after installation, it only reaches from 5-12 Mega Ohm). So American manufacturers research and put Epoxy as an insulating material for busbars. And it is mandatory for companies selling in the US to use Epoxy. Due to the following outstanding features: – Double insulation of Mylar (after installation it reaches from 20 – 50 Mega Om) – EPOXY life span is 50-70 years (Because Epoxy is an insulating material) tradition and longevity are confirmed), But Mylar, no one dares to confirm the longevity, but in fact it has been over 40 years and Mylar is still in good use.- EPOXY clings to the busbar into a block, the ability Very good waterproof. However, when the busbar is soaked in water, both Epoxy and Mylar have problems. But making Epoxy by the fluidizing method requires a technological line, and the know-how to prepare Epoxy + additives, to stick. tight to the guide bar, and has ductility. Therefore, only American epoxy technology can meet. GE, SIEMENS, SCHNEIDER, Cuttler Hammer all have to produce Epoxy in the US (only Schneider adds Mylar option for customers). LS Cable, because it wants to export globally, should buy US EPOXY technology, and hire all EPOXY engineers (American, Dutch) who worked for GE, Schneider in the US to go to HQ to convert to technology. Epoxy strictly according to American technology. After 3 years of mass sale, this technology of LS Cable proves to be of very high quality and is similar to that of GE USA. At the same time, two companies LS Cable (made in HQ) and GE (made in the US) by manufacturing epoxy insulation materials and 2-piece cast aluminum shell, should achieve the world’s highest 1s and 3s short-circuit currents, up to 200kA for 4000A or more (certified by Asta and Kema centers, and listed in the catalog). (Note: The GE made in China being offered for sale in Vietnam has a 4-piece aluminum housing, and uses mylar, which is much less resistant to short circuit than the GE made in Vietnam. USA)4. Bar shape: World standard busbar in sandwich shape (sandwich type) with 4 heat-dissipating blades. All brands do this, except for Translite, Mega Duct has a square shape, without radiator wings.5. Included accessories: All brands are the same, only LS Cable has the most advanced connector type in the world (with mount, to limit, this mount can be pressed down to guide bar). 2.5mm deeper than each side, and can be connected 2.5mm from this mount.So LS Cable is very flexible and doesn’t need an accessory called Extension (to compensate for length).In the accessories there is 1 mechanism. very important is to equip MCCB 3P, 4P for power box.Siemens equips MCCB with Icu=70kA or more, Ics=100% Icu, made in Germany.And LS Cable is equipped with Icu standard type of 50kA or more, Ics=100% Icu, Susol series, made in Korea (80kA can be used at your request, the price plus is negligible) Other brands see Icu=25kA, Ics=50% Icu (ie, short-circuit tolerance equal to half of the design, made in Asia).6- Commonly used busway standards and current IP: In the world and in Vietnam, busway types are commonly used:- 3P+100 %N+100%E =housing (maybe 200%N, add internal 50%, 100% E)- Aluminum housing (Alluminum Housing)- Conductive core Copper or aluminum (CU or AL)- IP 54- IEC 60439-1/2- Short circuit test ASTA, or TTA(World class IP 42 is almost eliminated , however persisted in poor countries, with low standards. This type allows dust less than 1mm to still penetrate into the busbar, and is less waterproof than IP 54. The manufacturing cost of IP 54 is not significantly higher than IP 42, but the technological line if changed, it is not easy, or adding adhesives to the joints generates labor). IP 65 type is rarely used. There is also a bus duct Cast Resin IP 68 for outdoor use, can be submerged in water, or underground, because the entire insulation and the shell, the connectors are poured epoxy into 1 block.7. The cost of the cable compared to the busbar: If the total current is too small, using the cable will be more profitable than the busbar, and when the current is large, using the busbar is more beneficial. So how much is the current standard to use the guide bar? According to statistics at HQ, from global construction companies such as Hyundai, Kumho, GS. All works with total current from 630A or more, using busway is the most economical (balance all costs of the two types). Therefore, almost all firms only produce at least 630 A or more up to 6300A (only LS Cable produces from 630 up to 7500A). In Vietnam, due to low labor costs, the human part Installation work will also be reduced, so. In Vietnam, if using aluminum busbars, starting from 1000A, it will be cheaper than cable, and when using copper conductors from 1250-1600A or more, it will be cheaper than cable (this is the cost part, in addition to saving space. because the busbar is also quite large). However, due to the need for aesthetics and space saving, almost since the end of 2008, all office buildings from 800 A and above all use busbars. At 800A load line, if aluminum busbars are used, the cost is about 10% more expensive than the cable. (Note: Small manufacturers, narrow market, not modern technology, production cost is not cheap, due to high cost. cost of maintaining the factory, and the team of commercial and service activities).8. Busway installation failures: On a global scale, busway failures occur with almost all carriers at specific construction sites. In general, the problems are summarized by the manufacturers as follows:- Due to manufacturing: almost rare, because all factories are tested (insulation with Mega Ohm meter – (must reach infinity value) and discharge electricity with a voltage of 3000VDC for each product before being shipped, except for the case of shocks during transportation, mechanical impacts (twisting, twisting),… Therefore, inspection before and after installation is mandatory to eliminate Discard the defective product.- Due to the connector is not tight: leading to discharge and damage.To overcome, global manufacturers have a connector that tightens with a 2-headed bolt, when tightening, only needs to tighten 1 end. above until the upper screw is released is enough tightening (800-1000kgN/cm2)- Due to water penetration: Almost all brands with IP 54 when long-term water penetration occurs, it will lead to problems for the bar system. Therefore, a dry storage environment and installation of the busbars is required.- Since all the heavy loads start at the same time: Very rarely, but there have been cases around the world. .- Due to foreign conductive objects short circuit the conductors at connection position: this is an installation error and all brands have to give up when this happens.- Due to damage to the suspension system: Leads to tilting, twisting, twisting, and very rarely. On the other hand, most of the incidents were caused by the maintenance and installation process.9. Rating according to manufacturing criteria and short circuit resistance: Based on all manufacturing parameters and test certificates (from world quality testing centers such as KEMA, ASTA, TTA) can be ranked The quality ratings of products sold in Vietnam are as follows: LS Cable and Siemens are leading in quality due to their aluminum housing, and high short-circuit current values. GE manufacturer in China has 2 layers of Mylar and aluminum case follows. Schneider ranked second because of the 4-piece shell, including 2 iron pieces. Siemens Vietnam on GE China, because Siemens Vietnam rolls 3 layers of Mylar into the insulating core, GE only rolls 2 layers. In terms of global manufactured products, currently only 4 companies have top quality busbars. The world is: – GE manufactured in the US – LS Cable made in HQ – Cutler Hammer (Eaton) made in the US – Siemens made in the US (short circuit also up to 200kA for 4000A and above). Cutler Hammer does not export to Vietnam, but only to developed countries. Siemens and Schneider have a higher world market share than LS Cable and GE globally because of their large European market, their factories in the US, and In short, based on all manufacturing and market share criteria, it can be said that Siemens, Schneider, LS Cable, GE, Cutler Hammer are worthy global brands.10. Market situation in 2008 and 2009: The trend of using Busway started when the number of high-rise buildings built a lot in Vietnam, from 2006 and earlier was not used much, mainly in foreign investment projects and products. used are Siemens, Schneider, LS Cable. LS Cable before 2006 sold to a few factories, and 2 hotels (Caravelle Saigon, and Daewoo Hanoi from 95-97). Siemens products imported from the US (Saigon Center), from Europe for Park Hyat, etc. Since 2007, there has been a tendency to use more due to the convenience and economy of Busway, in addition to the opening of the Siemens factory in Binh Duong, also contributed to popularizing the use of Busway for Vietnamese projects, and Malaysian firms also joined in, including 4 firms:- PPB- Henikwon- Translite,- Megaduct• LS Cable started to enter Vietnam.• GE brought products from China to offer for sale (technology as above), LS Cable, after being successful and rising to the No. 1 position in Singapore and the Philippines, started entering Vietnam with giant projects (Samsung factory). , Kumho Asianna,..). The total market sales in 2008 of Vietnam was about 5.5 million-6 million USD FOB, in which the sales of the firms in the order (relative number): LS Cable 1.65 million USDSiemens 1.4- 1.5 million USDScheneider 1.2-1.3 million USDPPB + GE + Hennikwon + Translite + Megaduct: about 1-1.4 million USD (Among Malaysian firms, only PPB manufactures 4-piece aluminum housings, the rest uses iron shells. ).

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