Powell dc bus duct can be fully integrated as part of an electrical distribution system, connecting from generators to other electrical equipment, making the continuous connection that started from powells other product line of bus ducts. Busbar design free download as powerpoint presentation. Note for such ratings, enclosure of nonmagnetic material alone is recommended due to high iron losses in a magnetic material. Free online copper bar weight calculator, check copper bus bar, copper flat bar, copper square bar, cu busbar and copper flat bar weight per foot. Dec 21, 2015 while this methodology doesnt have any relation with calculation of conductor bus sizing acsr for the switch yard projects.
Bus bar installation media is nonventilated ducting so following table. Bus drop cable pvc insulation pvc jacket applications. Plus, the physical structure of bus bars offers unique features in mechanical design. Busbar trunking system bbt in electrical construction, uses to transporting electrical power to a shorter distance but many utilization point, say, within the building or a compound of facilities. Calculate size of bus bar having following details bus bar. It is necessary that the proper impedance be used to represent the primary system. Introduction to short circuit current calculations. To calculate the resistive voltage drop of a length of busbar, enter in the width, length and thickness of the bar. Spectra and spectra ii series plugin and feeder busway installing spectra series busway 4 obstructions where a busway run must pass through a wall or floor, an opening one inch larger than the busway. Bus duct brings power directly to the power consum ing equipment and power can be taken off at one foot intervals. Terminations less costly than bus duct entry provision. Nonsegregated phase bus duct busduct eaton busduct provides flexible power distribution solutions for a variety of applications where change and adaptation are important.
Construction specification for electrical busbar trunking. Aug 03, 20 1600 amp bus duct with only 60 amps of load. Lowvelocity ductwork design is very important for energy efficiency in air distribution systems. This manual will be divided into several sections each section pertaining to a specific line of bus duct com plete with all of the dimensions, voltage drop curves, and characteristics. Distribution boards split the electrical supply into separate circuits at one location. Standards and applications of medium voltage bus duct. We are ready to custom engineer your utility, cogeneration, petrochemical or heavy industrial application with a complete range of bus duct products, systems and services.
Tap bar bus duct in case of current branching over 400 a plugin bus duct is indoor type only. Introduction mp husky cable bus systems are engineered and manufactured for superior reliability as well as to utilize less conductive material, providing signi cant savings versus nonsegregated phase bus duct, conduit and wire, and other electrical feeders. Types lx and mx bus duct are non segregated phase bus duct in accordance with ansi c 37. Busbar design thermal conductivity electrical resistance. Voltage drop equations voltage drop equations voltage drop v3 i r cos. More costly than cabl bus, to within 8 on top of cell or the duct including lugs and stress cone more cables to terminate. Additionally, some of these products have higher maximum velocity ratings.
In mounting the branch devices, the tap bar of the bus duct side and the conductor in the device are clamped by bolts. Cable bus systems are also very competitive to 600 volt bus duct systems as well. Labor cost installation labor costs for bus duct systems can be less than labor costs for cable bus depending on the particular installation. Compared to traditional fourpiece structures, the twopiece structure design of the pmax system reduces the temperature rise of the enclosure.
Design calculations may be made either manually or by spuapproved computer programs. You need to determine the faul level of the systems and full load current from the customer to determine the cb rating. Shortcircuit current calculations singlephase short circuits short circuit calculations on a singlephase center tapped transformer system require a slightly different procedure than 3o faults on 3o systems. You should be able to get the voltage drop information from the bus duct manufacturer, or would would need to know the area and material of the bus to do your own calculation. Powell is the premier designer and manufacturer of isolated phase bus, nonsegregated and segregated phase bus, cable bus and bus accessories in the united states. There may be an additional voltage drop due to the inductance of the bar. Less costly than bus duct entry termination box must have bus risers provides all cable termination hardware provision. Installed quickly without use of conduit for fixed or temporary power. It is an alternative means of conducting electricity to power cables or cable bus.
When building alterations or expansion add to power load it can be simply dismantled, rearranged or expanded. Powell prides itself in taking a holistic approach to every industries electrical distribution needs. Table c1 describes electrical calculation required for projects, tools to do the calculations, who is responsible for the calculations, and when they should be done. Showing limits of coldbending radius for 90 bends of usual sizes of aluminum tubes of alloys 6063t6 and. Abb low voltage and medium voltage busducts are safe, compact, flexible, reliable and efficient solutions for electrical power distribution. Recent progresses in busducts design article pdf available in compel international journal of computations and mathematics in electrical 351. Basically, lsc bus duct has been designed, manufactured, and provided in the. In electric power distribution, a bus duct also called busway, is a sheet metal duct containing either copper or aluminium busbars for the purpose of conducting a substantial current of electricity. Lowvelocity design will lead to larger duct sizes, but it may be worth since, doubling of duct diameter. When sizing busbars the designer only needs to make calcu. Determine the rating, location and quantity of branch units and calculate the. Busways, or bus ducts, are long busbars with a protective cover.
Voltage drop in volts v i current in amperes r conductive resistance in ohms ft. One disadvantage to locating the air handler in the attic space is serviceability. You can then calculate bus bar rating based on the total connected load supplied by the bus bar and rate you bus bar. They may be of the open type, such as to feed a very high current at very low voltage. Paying attention to certain details of bus duct projects will ensure troublefree service.
Earth safety grounding busbars are typically bare and bolted directly onto any metal chassis of their enclosure. Shortcircuit current calculations cooper industries. Carrying power through metalenclosed bus systems28987 bus systems as discussed later, this type of bus system can be easily replaced with the nonconventional bus systems. Easily disconnected and connected when machines are moved. Type lx bus duct is suitable for use on low voltage systems voltage up to 600 volts, while type mx bus duct is suitable for use on medium voltage systems voltages up to 15,000 volts. Sentron bus plugs also feature bolton mounting to the busway housing for secure attachment. However, bus duct problems can lead to catastrophic damage and extensive downtime.
Pdf recent progresses in busducts design researchgate. Copper or aluminum is used for the conductor of bus duct that be insulated and enclosed completely for protection against mechanical damage and dust accumulation. Duct board products are available with coated or faced airstream surfaces. However, due to the weight of bus duct, expensive lifting equipment is gen. Calculating bus duct voltage drop mike holts forum. Heat conduction and thermal resistance for steady state conditions and one dimensional heat transfer, the heat q conducted through a plane wall is given by.
For example, complete power distribution subsystems can also act as structural members of a total system. The bus plug ground stabs are designed to ensure positive contact with both the integral and optional internal busway grounds before the bus plug fingers contact the phase and neutral bars. Pdf energy resources management dictates the reduction of losses in electrical. In this new edition the calculation of currentcarrying capacity has been greatly simplified by the provision of exact formulae for some common busbar. Generally, it is preferred to distribute electrical energy by busducts in the place of cables over all. These products permit rigorous cleaning of the duct surface where dust has been allowed to collect in the duct due to lack of filtration or poor maintenance. Resistant to oil, grease, acids, cutting fluids and mechanical abuse.
Busduct is a system of distributing electric power using copper or aluminium busbars with. Bus bars reduce system costs, improve reliability, increase capacitance, and eliminate wiring errors. A bus duct system is an effective method of distributing power to your switchgear and various loads. There is a gener al application section that applies to all types. Spectra and spectra ii series plugin and feeder busway. Calculate size of bus bar having following details bus bar current details. The shorter the duct runs are, the lower the resistance to air flow and the lower the heat gains and heat losses will be. Design calculations establish minimum guidelines and requirements for generating electrical calculations on projects. In case of current branching over 400 a, a tap bar bus duct attached with tap bars, shown in the photo on the left, shall be used. Westinghouse bus duct can be installed easily in any layout, around any obstruction. Though cables can also be used in these areas, their economic impact would be high if compared to the effective busbar trunking system.
Oct 27, 20 power neutral busbars may also be insulated. For use as drop cable from overhead bus duct to floor machines. Copper bar weight calculator, flat and copper bus bar weight. Scribd is the worlds largest social reading and publishing site. Gas insulated sulfur hexafluoride enclosed oil cooled. Abus duct system is an effective method of distributing power to your switchgear and various loads. Busbars may be enclosed in a metal housing, in the form of bus duct or busway, segregatedphase bus, or isolatedphase bus.
508 830 226 1403 1316 412 944 449 1009 680 116 704 1335 853 740 397 634 1604 70 753 547 968 427 309 1297 1641 124 755 1336 191 777 1505 1424 163 465 709 1067 603 380 1368 1086