The 18,688-seat FIU football stadium was designed with about 12 transformers as part of the electrical system distribution in order to supply general-use receptacles, small motors, and other loads in the stadium building structure and the attached field house building. "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} Develop a procedure for inventory of all tools, hardware, and any other objects used in the inspection, assembly, and testing of the transformer. This tool is a safer and more effective alternative to sending crews on foot to perform backpack spraying in rough and mountainous terrain or hard-to-access areas, while also maintaining effective vegetation management along our power lines. Use of alternate means of fire protection must be approved by the local code enforcement authority. endstream endobj startxref A check sheet should be used to record all items, and verification should be made that these items have been properly accounted for upon completion of work. Information on minimum wire bending space clearances at terminals for conductors is found in NEC Sec. <> Sealed dry-type transformers are similar to dry type in most of their characteristics. Caution is required when operating in parallel. Oil-filled transformers are constructed with the windings encased in an oil-tight tank filled with insulating mineral oil. These considerations should be taken into account, as well as the use of sound absorbing materials on walls (for low frequency sound) and vibration isolation pads under the unit. There may be local nonprofits that will collect and distribute wood to those in need. Transformers change voltage levels to supply electrical loads with the voltages they require. 2067 0 obj <>/Filter/FlateDecode/ID[<40F8DD91F560784FAE35A61D83A94C90>]/Index[2043 102]/Info 2042 0 R/Length 116/Prev 852971/Root 2044 0 R/Size 2145/Type/XRef/W[1 3 1]>>stream You should use commercially available, properly sized, UL-listed mechanical- or compression-type lugs. There are different construction types for transformers used in commercial buildings. Equipment operation characteristics will continue to change. more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) * Applied and induced potentials, which verify dielectric strength. Small transformers, arguable those below 400kVA, usually don't have extensive testing as they are often installed far downstream in a power system; as such, their importance is not as vital as compared with larger units. it windows (first story) 10 10 K-rated transformers do not mitigate or eliminate harmonics. The location of a transformer relates directly to how noticeable its sound level appears. Createlogodesign were fantastic. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k, `h`` ``{_j j[e13b{@38O=)HpG17hCDC i. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. We attempt to notify individual customers in advance of trimming or taking down trees on their property by leaving detailed door hangers with contact information. Are you sure you want to delete your template? North America | April 5, 2018. 2013-2014 | All Rights Reserved MERIT MEDIA INT. The transformer is equal to or less than its rated kVA and rated voltage. Does Duke Energy use herbicides to control vegetation in rights of way? Revision 009 Effective Date 02/18/2022 . We offer a 100% Satisfaction Guarantee. Ensure that all grounding or bonding systems meet NEC and local codes. When does Duke Energy trim a tree versus take down a tree? A number of manufacturers require that insulation resistance testing be successfully completed prior to the transformer being placed in service for the warranty to be valid. endobj endstream endobj 821 0 obj <. There are different ways in which transformers are installed and used as part of a commercial building electrical system. 0 0 450-10 and check the grounding of the neutral as applicable per NEC. When viewing transformer product literature, you'll probably find that one manufacturer's units will have differences from that of a competing manufacturer. 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If in doubt about clearances, do not hesitate to call the transformer manufacturer. This article will continue in subsequent issues of EC&M. These provisions will vary depending upon the weight, size, and mechanical configuration of the unit. % hb```f eaak \6XBt+eNHPY0?P0dTh D>+30mg`T}n303c2bpa4%u`(00m] 9>b`28 *> Trees can disrupt power in a number of ways. 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Any control circuits, if any, should be checked to make sure they function correctly. Torque specifications are sometimes listed on the hardware. Transformer primary and secondary voltages can be 2,400; 4,160; 7,200; 12,470; and 13,200 for 15-kV Class, and 120, 208, 240, 277, and 480 for 600-V Class. Watch Jana's Story. They were great at following our directions to the letter, while adding their own creative flair. Cast-coil transformers are constructed with the primary and secondary windings encapsulated in reinforced resin. If any PECO Energy Employee However, anyone is encouraged to report unsafe conditions. We are delighted with the end result, it looks incredibly professional. The article in this issue covers installation procedures you should consider to help assure your transformer will function properly and safely, and it's focused on installation practices that are common for both dry-type and liquid-filled transformers. The cookie is used to store the user consent for the cookies in the category "Other. Duke Energy contractors have been trained on the proper, safe and environmentally responsible techniques of managing plant growth. Hint: Duct Tape to the Rescue. You should note, though, that transformers serving large harmonic loads can produce a higher audible noise. The development was easy because Steffi provided unlimited revisions, so we went through a series of small changes until we got a final. 373-6, Deflection of Conductors, and referenced in Sec. We work diligently to capture the look and feel that you always desired for your logo. Disposal of any wood, limbs or debris resulting from this type of emergency operation is the responsibility of the property owner. Such stress could cause a bushing to crack or a connection to fail. A right of way is a type of easement or agreement that grants a utility the right to use, access or transit a piece of property. 1 A Minimum of 4 Original Drafts for your Logo. There are instances when a tree must be trimmed or removed without prior notification. Take care not to damage the base or tip it over. With Duke Energys Builder Portal, you have the tools you need to get it done, right at your fingertips. Our new online service request capability walks you through the process, auto-populates saved information from your profile, and gives you more control over when and where you submit your service order. Register for the portal today. A general approach to determining transformer capacity and selecting the proper rating for the design application is to obtain the calculated design load from the respective electrical schedule and add 20% spare capacity for future load growth to be shown in the equipment schedule, unless otherwise directed by the facility based on design parameters. hbbd```b``{"@$$)fO8,f`v/~, lb{ 6_DrGH 8Xqf$]v P(9Wl0 v This type is the most common to be used in the building indoor electrical system distribution. Usually, lateral bracing and/or an extra solid anchorage will be required. Transformers are designed with provisions for lifting, jacking, and/or rolling. If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. Selecting, sizing transformers for commercial buildings, By using this website, you agree to our use of cookies. But be careful here: Before applying this voltage, check with the manufacturer's manuals. Other site considerations require closer analysis. This may call for compromises regarding the length of the conductors going to and/or from the transformer. Serious injuries and even fatalities have occurred when endobj Performing this action will revert the following features to their default settings: Hooray! thick with chamfered edges on top of the base and footings extending 20 in. From the start Steffi was prompt and responsive. However, for low-voltage (600V and below) transformers, this is not practical. . When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. Locating a unit at the end of a long, narrow room, or in the corner of a room can cause a megaphone effect and amplify the transformer's sound. It is good practice to regularly test this type of transformer in order to determine dielectric breakdown, which affects its useful life. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k. The average temperature of the cooling air during a 24-hour period is 86 F. The temperature of the cooling air at no time exceeds 104 F. Selecting Transformer selection starts with the kVA rating required to supply the loads connected in the electrical system. Foundations. It's recommended that all conducted tests comply with applicable ANSI/IEEE and NEMA standards. When does Duke Energy obtain permission to trim or take down a tree? Structural support. Examination should be made before removing it from the railroad car or truck, and, if any damage is evident or any indication of rough handling is visible, a claim should be filed with the carrier at once and the manufacturer notified. stream You also have the option to opt-out of these cookies. This cookie is set by GDPR Cookie Consent plugin. 820 0 obj <> endobj If our attempts to notify you are unsuccessful, work will proceed without further direct notification. They contain an enclosure surrounding the windings for their mechanical protection and the safety of personnel. This should be done at some safe access point near or at the load. Most soils are able to withstand a bearing pressure of 2500 lbs/sq ft. Therefore, the transformer size required for converting the system voltage from 480 V, 3-phase, 3-wire to 208 Y/120 V, 3-phase, 4-wire is: Transformer size in kVA = 42 kVA x 1.25 = 52.5 kVA. The secondary is 3-phase, 4-wire or Wye connected. thick with chamfered edges on top of the base and footings extending 20 in. For example, if the transformer is installed in a quiet hallway, a definite hum will be noticed. h[oWcp :\_H84$p~U==$W9A{fzQ!wZkzjgybveni\+\-\z&w:%HE*:Er;cWc Tree placement in relation to overhead power lines is critical in order to preserve the natural size, shape and overall integrity of the tree and protect the intent for which it was planted. They typically have primary voltages higher than 600 V and secondary voltages lower than 600 V with compartments for the associated protective devices assembled in an integral tamper-resistant and weatherproof unit. endstream endobj 53 0 obj <>/Metadata 20 0 R/OpenAction 54 0 R/PageLayout/OneColumn/Pages 50 0 R/StructTreeRoot 32 0 R/Type/Catalog/ViewerPreferences<>>> endobj 54 0 obj <> endobj 55 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 56 0 obj <>stream This rating provides the associated power output delivered for a specific period by the loads connected to the transformer on the secondary side of the equipment. While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. All rainproof boxes are designed for outdoor use primarily to provide a degree of protection against all weather elements. [ILLUSTRATION FOR FIGURE 2 OMITTED]. Retail & Schools Depending upon the size and load requirements of the facility, the large majority of schools (except for some very large universities) and retail facilities are served by Also, it's a matter of cost. How do I identify distribution and transmission structures? Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. %PDF-1.7 % Serious injuries and even fatalities have occurred when untrained individuals have done this work without the assistance of qualified professionals. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Before working on the connections make sure all safety precautions have been taken. You should consider this when planning the unit's installation. This category only includes cookies that ensures basic functionalities and security features of the website. If you cannot gradually increase the load, then full load may be applied. These cookies ensure basic functionalities and security features of the website, anonymously. Some microprocessor-based electronic devices may not be able to withstand the voltage. Transformers remain a fundamental component of electrical distribution systems. How do I request tree trimming or tree removal by Duke Energy? Facility Connection Requirements . When planning the installation, you should select a location that complies with all safety codes yet does not interfere with the normal movement of personnel, equipment, and material. I have recently used the services of CreateLogoDesign.com, and found their standard of skill and creativity to be exemplary. And its important that you follow current NEC practice and applicable local codes. If this does not happen, de-energize the transformer and contact the manufacturer. Great work! driveways clearance with limited building heights Public roads and commercial driveways (except State Highways and Interstates Railroad electrified) * Supply service drops Sometimes, when testing is carried out at the manufacturer's plant, the manufacturer will also allow a purchaser or a representative, such as a consulting engineer, to witness the tests. You have already flagged this document.Thank you, for helping us keep this platform clean.The editors will have a look at it as soon as possible. Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. You should ground the transformer as per NEC Sec. Two good references to dry-type transformer requirements are ANSI/IEEE C57.12.01-1989, IEEE Standard General Requirements for Dry-Type Distribution and Power Transformers Including Those With Solid Cast and/or Resin-Encapsulated Windings, which addresses general requirements, and C57.12.91-1995, IEEE Test Code for Dry-Type Distribution and Power Transformers, which addresses testing. They gave us 6 logo ideas to start with. When selecting a tree or shrub to plant, it is just as important to consider what you plant as it is where you plant. What happens when trees come into contact with power lines? Before applying any voltage to the transformer, you should make sure that the tank for wet-types, or the enclosure and core assembly for dry-types, is permanently and adequately grounded. 837 0 obj <>/Filter/FlateDecode/ID[<628CD90D08ABAB4FB038EF4B9C9C7E56>]/Index[820 28]/Info 819 0 R/Length 84/Prev 192869/Root 821 0 R/Size 848/Type/XRef/W[1 2 1]>>stream Do you have experience and expertise with the topics mentioned in this content? endstream endobj 53 0 obj <>/Metadata 20 0 R/OpenAction 54 0 R/PageLayout/OneColumn/Pages 50 0 R/StructTreeRoot 32 0 R/Type/Catalog/ViewerPreferences<>>> endobj 54 0 obj <> endobj 55 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 56 0 obj <>stream This material will provide additional general guidelines for installing and testing both dry-type and liquid-filled transformers for placement into service. Check all of the tap jumpers for proper location and for tightness. These practices are approved by internationally recognized tree care associations and are referred to as Integrated Vegetation Management (IVM). 71 0 obj <>/Filter/FlateDecode/ID[<17271311DD281D44B60DE10DB84FA7A1>]/Index[52 27]/Info 51 0 R/Length 98/Prev 491904/Root 53 0 R/Size 79/Type/XRef/W[1 3 1]>>stream //-->
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