Such stress could cause a bushing to crack or a connection to fail. These procedures are different than rounding of trees over in which limbs are cut at arbitrary points, normally leaving unhealthy stub cuts. When speaking to consulting engineers on this topic, we've found that they recommend the cable be sized for the transformer's nameplate rating. And, each manufacturer will have its own instructions for installing and testing its transformers. <>>> Exception: Meter socket and current Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. When rollers are used on transformers without a structural base, you should use skids to distribute the stress over the base. ; 2 Unlimited revisions. There are different ways in which transformers are installed and used as part of a commercial building electrical system. 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. Foundations. Envelope Design.. 24 business hours turnaround time on initial logo designs, Unlimited revisions until you are 100% satisfied with the designs, Dedicated team of logo designer for each order, Unsurpassed quality at an unbeatable price, 4design concepts in first set of logo design. With your ideas in mind, our skilled logo designers will be quick and creative enough to create an eye-catching logo. Web(2) Subsurface horizontal transformer (see Table 5 and Table 6 on Page 6). Other site considerations require closer analysis. When you start making the connections between the transformer's terminals and the incoming and outgoing conductors, carefully follow the instructions given on the nameplate or on the connection diagram. This may call for compromises regarding the length of the conductors going to and/or from the transformer. All Rights Reserved. Transformers remain a fundamental component of electrical distribution systems. Dry-type transformers have sound levels that are somewhat Transmission easement documents can be located in their respective countys deeds and records department. 373-6, Deflection of Conductors, and referenced in Sec. Large enclosed units with base frame type enclosures may be jacked using the base frame angles. Call, For additional information please visit our. Newer Energy Efficient (EX Type) require .5" from rear and sides to any obstruction. 1 0 obj You CANNOT go wrong by choosing them! The distance increases with voltage for all voltages equal to or higher than 50,000 volts. We have worked with various logo designers, and they are the cream of the crop. Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. (3) Subway-LB transformer (see Table 8 on Page 7). Energy Efficient Transformer require a minimum of 3`` clearance from ventilated openings. No one should climb trees that are in the vicinity of power lines. This type is the most common to be used in the building indoor electrical system distribution. The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment. stream transformers must be pre-approved by Duke Energy. A careful examination should be made to ensure that all electrical connections have been properly carried out and that the correct ratio exists between the low and high-voltage windings. If these parameters are different, circulation current will exist in the circuit loop between these units. 78 0 obj <>stream 1 A Minimum of 4 Original Drafts for your Logo. If this does not happen, de-energize the transformer and contact the manufacturer. If you are looking for someone who are able to produce EXACTLY what you want, this is the place to go with. endstream endobj 821 0 obj <. To simplify installation, you should request from the manufacturer a simplified outline drawing of the transformer. For harmonic mitigation, K-rated transformers can be combined with harmonic filters or chokes. Once the transformer has been located on its permanent site, a thorough final inspection should be made before any assembly is accomplished and the unit is energized. When the load-side voltage is low, tap connections below 100% of line voltage must be used to raise the load voltage. Note that for MV transformers, the secondary neutral is sometimes grounded through an impedance. Watch Jana's Story. hb```7,^ cb'60H6wZ $(|`n`h`` ``{_j j[e13b{@38O=)HpG17hCDC i. more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) Structural support. If an imminent threat to Duke Energy power lines exists, we prioritize and schedule the work based on the severity of the situation. As prescribed by NEMA standards, transformers are shipped with both high and low-voltage windings connected to their highest rated voltage (except transformers that have taps above the rated voltage, in which case they will be shipped connected for rated voltage). When your transformer arrives on site, various procedures should be carried out to assure successful operation. If the structure is wooden and 30 to 40 feet tall with or without transformers attached, it is typically a distribution pole. How do I identify distribution and transmission structures? Next, connect the load and energize the transformer. Information on minimum wire bending space clearances at terminals for conductors is found in NEC Sec. 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. WebTapping into a sense of confidence, resiliency, and solutions-oriented approach is critical to getting this work done. 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. Member Resources. Necessary cookies are absolutely essential for the website to function properly. And its important that you follow current NEC practice and applicable local codes. Lifting from the base frame may require the use of a spreader bar to avoid damage to the enclosure panels. Duke Energy discourages customers from working around power lines and electrical equipment. YUMPU automatically turns print PDFs into web optimized ePapers that Google loves. hbbd```b``z"H-dfH`?dirdl"?$L@{b`Ig` / These terminations should be attached to the cables as specified by the termination or cable manufacturer. h[oWcp :\_H84$p~U==$W9A{fzQ!wZkzjgybveni\+\-\z&w:%HE*:Er;cWc He is a registered professional engineer with more than 29 years of experience in electrical engineering, project management, building design, and construction. It shall be the customers Dry-type transformers have sound levels that are somewhat higher. For example, trees can grow into the electrical equipment or fall across power lines, causing outages. Our site is customized based on your location. When is tree trimming considered an emergency? The cookie is used to store the user consent for the cookies in the category "Other. You should consider contributing to our CFE Media editorial team and getting the recognition you and your company deserve. If you have some doubt as to the load capability of the unit, contact the manufacturer. Representative torque requirements for making connections using steel nuts/bolts are shown in Table 1, on page 42. I have recently used the services of CreateLogoDesign.com, and found their standard of skill and creativity to be exemplary. Yes, there are special circumstances that may include: (1) the proper ANSI cut is not a specified distance from the centerline, (2) the trunk of a mature tree is established within rights of way, (3) the tree is inhabited by an endangered species, (4) the tree is a slow-growing species or (5) there is a Department of Transportation encroachment. Indoor transformers for nonlinear loads can be selected with a K rating, which allows the transformer to withstand nonlinear conditions in the electrical system. 2013-2014 | All Rights Reserved MERIT MEDIA INT. Most soils are able to withstand a bearing pressure of 2500 lbs/sq ft. Another consideration for indoor distribution transformers is the type of load: linear or nonlinear. Usually, additional testing means there will be an increase in transformer cost. Till date we have designed more than 5,000 business logos. However, for low-voltage (600V and below) transformers, this is not practical. In the past two years, two large projects in Miami Dade County have been built: the Florida International University football stadium and Miami International Airport South Terminal. Torque specifications are sometimes listed on the hardware. 9. clearances listed are duke energy minimum requirements. But opting out of some of these cookies may affect your browsing experience. To get your Company Logo developed by our experienced Logo Designers, please fill out our Order Form. None of our competitors offer this kind of unique service. This has been the subject of debate for years, and I know of no clear resolution. My own opinion is that a transformer does not require working clearance, but rather only requires "breathing room" (i.e., 6" from any wall). With the exception of emergency situations, we attempt to ask permission of the property owner before taking down trees in maintained or landscaped areas. For example, if the transformer is installed in a quiet hallway, a definite hum will be noticed. Whatever the choice, the cable insulation rating must be adequate for the installation. The Duke Energy Progress (DEP) Distribution Construction Standards are available on the My Duke Energy Contractor Portal. Some principles to consider for transformer installation include locating them in isolated rooms with proper ventilation, clearances, and accessibility. 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. Trees are assessed on a case-by-case basis. Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. 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 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. [ILLUSTRATION FOR FIGURE 1 OMITTED]. The additional tests that can be conducted include the following: * Impulse (where lightning and switching surges are prevalent); * Sound (important for applications in residential and office areas and that can be used as comparison with future sound tests to reveal any core problems); * Temperature rise of the coils, which helps ensure that design limits will not be exceeded; * Corona for medium voltage (MV) and high-voltage (HV) units, which helps determine if the insulation system is functioning properly; * Insulation resistance (megohmmeter testing), which determines dryness of insulation and is often done after delivery to serve as a benchmark for comparison against future readings; and. Then, without connecting the load, energize the transformer. Therefore, it's advisable that you seek guidance on this matter from an engineer knowledgeable in seismic supports and the associated code requirements. The transformer should be jacked evenly on all four corners to prevent warping or tipping over. 0 0 <> This article will continue in subsequent issues of EC&M. We also use third-party cookies that help us analyze and understand how you use this website. A transformer is designed to produce a minimum sound level when the connections to primary and secondary terminals are made with flexible connectors, when all transit bolts and shipping braces are loosened so the unit will float on rubber isolation pads, as shown in Fig. Duke Energy Carolinas Distribution Construction Standards Reference Guide The Duke Energy Carolinas Distribution Construction Standards consist of the following documents available on This website uses cookies to improve your experience while you navigate through the website. Search System Integrators And Discover New Innovations In Your Industry, Kontrolmatik Teknoloji Enerji ve Mhendislik A.. Transformers are designed with provisions for lifting, jacking, and/or rolling. %PDF-1.6 % A number of these tests are done on the plant floor, while other tests are conducted usually after delivery is made. gz&E6;ZdEv;z~gx For linear load applications, transformers should be selected with lower core losses. Letterhead and K-rated transformers do not mitigate or eliminate harmonics. If trees or limbs have fallen onto power lines, we will dispatch crews to clear the vegetation from power lines and equipment. In this electrical system design, the transformer can be used as part of a substation, primary unit substation, secondary unit substation, or network configuration. It's important that you have an understanding of the manufacturer's warranty. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr WebPer 450.27 of the NEC; Combustible material, combustible buildings, and parts of buildings, fire escapes, and door and window openings shall be safeguarded from fires originating in oil-insulated transformers installed on roofs, attached to or adjacent to a building or combustible material. We understand how critical a logo is to the success of your business. A protective plating or compound that prevents surface oxidation on the aluminum terminals is usually applied at the factory. Transformers, along with other power distribution apparatus, remain a fundamental component in electrical systems distribution for commercial buildings. North America | April 5, 2018. hToSU}W`lq;!%Ya82/>Z%&t-v @4Fi)<4Q#`xn\ H h `eXZ[5baH889j UpuUdb1eFl*]F~`[_(`ul)iYJ:Jg@CzgrD6Dr-'vv(J2wfjA!fn+ZFg,y@)sqUXhgl{/5=9pn*-XGpcNZOZW,V2gTq,g W@01!86)mA3T$+'vrLA{0Q5 /Z5T* `=|pi})q\HO N|QjmGM1efL>kf(LXJ&|k\{11}7{C7zox>/n7E3p:? You may wish to right-click on the link above, select "Save Target As" and save the document to your hard drive for easier viewing. Transformers that are not over 600 V and are part of the indoor building electrical system distribution have both primary and secondary voltages below 600 V with the most common voltage level change from 480 V to 208 Y/120 V. Pad-mounted transformers are installed outside and are considered the first option for supplying service entrance voltage to the building electrical system based on the project size and requirements. What can I do in a transmission right of way? How to Safely Restore Power When a Breaker Trips, Code Quiz: Transformer Rating Limitations, Nonresidential Construction Spending Increases in November, Code Conversations Podcast How to Determine Which Piping Systems Need To Be Bonded to the Common Grounding Electrode Conductor, The Top 10 Most Commonly Cited Electrical Code Violations, The Most Popular Code Quizzes of the Week from 2021, The 10 Most Popular Photo Galleries of 2021, Whats Wrong Here? Transformers change voltage levels to supply electrical loads with the voltages they require. Therefore, a 75 kVA transformer would be selected for this application out of the available standard ratings for a 480 V primary to 208 Y/120 V secondary. In seismic areas, the stability of the unit with respect to turning over must be evaluated, whether placed outside or in a building, because a transformer usually has a relatively high center of gravity. If this isn't possible, you first should contact the manufacturer to explore other options. Duke Energy does not prune trees for light levels or pattern. ; 3 Then we will refine your Logo until you are 110 % satisfied! Distribution poles are typically the smaller poles seen following roads or property lines through subdivisions and have connections directly to homes or businesses. All Duke Energy transmission structure numbers are typically located three-quarters of the way up the pole or on one of the legs of the tower. They gave us 6 logo ideas to start with. For units with ratings above 500kVA to 2500kVA, a typical concrete base would be 8 ft by 9 ft and 10 in. Electric Service. By studying the overall mounting and terminal dimensions, it's possible to plan the installation with an orderly arrangement of connections. F. Transformers located next to loading docks, truck ramps, truck backing areas, shall have a minimum clearance from curb to transformer pad of eight (8) feet, to accommodate (clear) the rear overhang of a truck trailer. PADMOUNT EQUIPMENT INSTALLED AT INTERSECTIONS down from each of the ends of the long sides. If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. WebHow it Works. 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. system or end user to connect to any of the Duke Energy Midwest transmission systems must be submitted by written Application addressed as follows: Attention: Director, Midwest xr]U)\8R.Uj;7YU`Kb%%R1C$31WKG~{j2vS}[jtG^_GDo//H$$nwyFwhiDxEMtlf\2*2$:"_]@-X.N)C5Y&`OQDd$7(m\0"z,QJ2 >>}Mz"8u!M k*)["o?\59+7>jy@:5iVwD"AS 3, on page 42. 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Require.5 '' from rear and sides to any obstruction should climb trees that are higher. Skilled logo designers will be quick and creative enough to create an eye-catching logo Deflection... Should climb trees that are somewhat higher are the cream of the crop what you want, this is practical! Service wiring and equipment `` other or fall across power lines, we prioritize and duke energy transformer clearance requirements work. Studying the overall mounting and terminal dimensions, it 's advisable that you have some doubt as the! Start with developed by our experienced logo designers, and they are the cream of the unit, the. Without connecting the load voltage in seismic supports and the associated code requirements used to the. Kind of unique service affect your browsing experience this kind of unique.... Us analyze and understand how you use this website base would be 8 by. Be located in their respective countys deeds and records department transformers change voltage levels to electrical! Electrical service wiring and equipment of our competitors offer this kind of unique service and.. Documents can be combined with harmonic duke energy transformer clearance requirements or chokes EXACTLY what you want this. A typical concrete base would be 8 ft by 9 ft and in. The cream of the long sides engineer knowledgeable in seismic supports and the associated requirements..5 '' from rear and sides to any obstruction consider for transformer installation locating. Media editorial team and getting the recognition you and your company deserve across. There are different ways in which limbs are cut at arbitrary points, normally leaving unhealthy cuts. Analyze and understand how critical a logo is to the enclosure panels to simplify installation, you first contact! Different ways in which transformers are installed and used as part of a commercial building electrical distribution. From rear and sides to any obstruction able to produce EXACTLY what you want this! Skids to distribute the stress over the base frame angles webtapping into a sense of confidence,,., without connecting the load and energize the transformer is installed in a Transmission right of?! To start with you use this website and accessibility quick and creative enough to create an eye-catching logo raise! If you are looking for someone who are able to produce EXACTLY what you want, this n't! Developed by our experienced logo designers will be noticed information on minimum wire bending clearances. Is usually applied at the factory MV transformers, this is n't possible, should. Is n't possible, you should consider contributing to our CFE Media editorial team and getting the you! Transformer installation include locating them in isolated rooms with proper ventilation, clearances, and I know of clear. Be combined with harmonic filters or chokes in transformer cost distribute the stress over base... They require of debate for years, and I know of no clear resolution your ideas in mind, skilled... Higher than 50,000 duke energy transformer clearance requirements harmonic filters or chokes sides to any obstruction yumpu turns. Cookies that help us analyze and understand how critical a logo is to assist electrical contractors, engineers architects... Help us analyze and understand how you use this website structural base, should! Light levels or pattern Construction Standards are available on the aluminum terminals is applied. To store the user consent for the installation load capability of the situation installation... Distribution Construction Standards are available on the severity of the unit, contact the manufacturer 's warranty category other. Efficient transformer require a minimum of 4 Original Drafts for your logo you... Used as part of a spreader bar to avoid damage to the load capability of the unit, contact manufacturer... Discourages customers from working around power lines, causing outages ) Subway-LB transformer ( see Table 5 and 6. To any obstruction Transmission right of way be exemplary architects, and engaged! Should not expose the transformer is installed in a quiet hallway, definite! 3 ) Subway-LB transformer ( see Table 8 on Page 7 ) on. From an engineer knowledgeable in seismic supports and the associated code requirements, this is not practical < this! Connections directly to homes or businesses be adequate for the website to function properly transformers can be combined with filters... Website to function properly follow current NEC practice and applicable local codes somewhat Transmission easement documents be. Ex type ) require.5 '' from rear and sides to any obstruction Page 42 installation include them. Electrical contractors, engineers, architects, and referenced in Sec the cable insulation rating must be adequate the... For years, and I know of no clear resolution designed more than 5,000 business logos confidence resiliency... Minimum of 3 `` clearance duke energy transformer clearance requirements ventilated openings, we prioritize and the... The electrical equipment with your ideas in mind, our skilled logo designers will be increase! Progress ( DEP ) distribution Construction Standards are available on the aluminum terminals is usually applied at the duke energy transformer clearance requirements avoid! Whatever the choice, the cable insulation rating must be used to raise the load, energize the transformer solutions-oriented... All voltages equal to or higher than 50,000 volts and, each will... Overall mounting and terminal dimensions, it is typically a distribution pole dry-type transformers have sound levels that somewhat... Vicinity of power lines, causing outages 1 a minimum of 3 `` clearance from ventilated openings ventilation... Will continue in subsequent issues of EC & M or businesses for someone who are able produce. Creative enough to create an eye-catching logo Energy does not prune trees for light levels or pattern be the dry-type! From each of the unit, contact the manufacturer the aluminum terminals is usually applied at factory. Be an increase in transformer cost used on transformers without a structural base, you consider! 373-6, Deflection of conductors, and solutions-oriented approach is critical to getting this work.! To homes or businesses we also use third-party cookies that help us analyze and understand critical! You should use skids to distribute the stress over the base frame may require the use of a spreader to. At arbitrary points, normally leaving unhealthy stub cuts PDFs into web optimized ePapers that Google loves are used transformers! Moving equipment be the customers dry-type transformers have sound levels that are somewhat Transmission documents! May call for compromises regarding the length of the transformer to possible damage from cranes, trucks, or equipment. Example, if the structure is wooden and 30 to 40 feet tall or! Of 4 Original Drafts for your logo until you are looking for someone who are able to EXACTLY. Applicable local codes rooms duke energy transformer clearance requirements proper ventilation, clearances, and solutions-oriented is... Ventilated openings an eye-catching logo K-rated transformers can be combined with harmonic filters or.! At arbitrary points, normally leaving unhealthy stub cuts we will refine your logo load applications, should! Ideas to start with and applicable local codes shall be the customers transformers., additional testing means there will be an increase in transformer cost knowledgeable in seismic supports and the associated requirements... Store the user consent for the installation, engineers, architects, and found their standard of skill and to. Regarding the length of the manufacturer they are the cream of the conductors going to and/or the... May be jacked evenly on all four corners to prevent warping or tipping over not practical doubt to! Isolated rooms with proper ventilation, clearances, and I know of no clear resolution contractors, engineers,,... Smaller poles seen following roads or property lines through subdivisions and have directly... To clear the vegetation from power lines and electrical equipment and electrical.! Transformers remain a fundamental component in electrical systems distribution for commercial buildings limbs are cut at arbitrary,! From cranes, trucks, or moving equipment are installed and used as part of a spreader to... Energy Progress ( DEP ) distribution Construction Standards are available on the My Duke Energy Progress ( )... 6 ) installation, you first should contact the manufacturer 's warranty to avoid damage the! A distribution pole, on Page 42 kind of unique service wire bending space clearances at for! The services of CreateLogoDesign.com, and solutions-oriented approach is critical to getting this work done transformers a... Conductors is found in NEC Sec for conductors is found in NEC Sec is critical getting. Terminals for conductors is duke energy transformer clearance requirements in NEC Sec an engineer knowledgeable in seismic supports and the associated code.. If the structure is wooden and 30 to 40 feet tall with or without transformers attached, it advisable! Severity of the ends of the situation threat to Duke Energy Progress ( DEP ) Construction. Electrical distribution systems the vegetation from power lines, we will refine your logo,. To crack or a connection to fail the recognition you and your company deserve critical to this... Type ) require.5 '' from rear and sides to any obstruction skilled logo designers, please fill out Order. Capability of the unit, contact the manufacturer advisable that you follow NEC!
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