duke energy transformer clearance requirements

This category only includes cookies that ensures basic functionalities and security features of the website. 1&Ub64#C #") "7KWpzJz1YeHB.r32Az{`gC~;jiV[Ceb*1rAz96lnA|3$ Following are some of the transformer types available in the industry along with a few of their characteristics: Ventilated dry-type transformers are ventilated by air, use larger space for clearance, and use different insulating materials to augment the dielectric strength of the air. Do not install washers between the terminal lugs and the termination bus bar as this will introduce an added impedance and will cause heating and possible connection failure. All rainproof boxes are designed for outdoor use primarily to provide a degree of protection against all weather elements. Never attempt to check the output voltage at the transformer. Take care not to damage the base or tip it over. When viewing transformer product literature, you'll probably find that one manufacturer's units will have differences from that of a competing manufacturer. Dangerous high voltage will be present within the transformer enclosure. We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. 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. This may call for compromises regarding the length of the conductors going to and/or from the transformer. Line side (unmetered) and load side (metered) conductors shall not occupy the same raceway or enclosure. Indoor transformers for nonlinear loads can be selected with a K rating, which allows the transformer to withstand nonlinear conditions in the electrical system. Usually, lateral bracing and/or an extra solid anchorage will be required. 52 0 obj <> endobj In non-landscaped sites, pruned vegetation and wood are left in place to biodegrade. 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. They supply the required incoming electrical service to the buildings. Non-ventilated Transformers should be a minimum of 3 inches from any obstruction on all sides and top. It is obvious that CreateLogoDesign takes great pride in their work and rightly so. If this data can be used, the extra cost to carry out tests can be avoided without sacrificing the quality of the transformer. 0 0 more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) <> <>>> If the transformer can't be lifted by a crane, it can be skidded or moved on rollers, as shown in Fig. The foundation should be constructed of reinforced, air entrained concrete having at least 3000 psi compressive strength at 28 days after pouring. When rollers are used on transformers without a structural base, you should use skids to distribute the stress over the base. Thanks! Trees can disrupt power in a number of ways. Well remember your selection for future visits. We understand how critical a logo is to the success of your business. For units with ratings above 500kVA to 2500kVA, a typical concrete base would be 8 ft by 9 ft and 10 in. 78 0 obj <>stream Energy Efficient Transformer require a minimum of 3`` clearance from ventilated openings. %%EOF However, anyone is encouraged to report unsafe conditions. WebTapping into a sense of confidence, resiliency, and solutions-oriented approach is critical to getting this work done. The ESR Manual provides guidance and instructions pertaining to electrical service connections. Our programs objective is to minimize tree-related power outages in a manner that is consistent with good arboricultural practices. Why do you apply herbicides via helicopter? The above simple calculation meets the intent to achieve the normal life expectancy of a transformer, which is based on the following basic conditions: Transformer selection starts with the kVA rating required to supply the loads connected in the electrical system. The transformer is equal to or less than its rated kVA and rated voltage. 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. In addition, the size of the commercial facility will determine the appropriate approach for designing the electrical distribution system for the specific application. This material will provide additional general guidelines for installing and testing both dry-type and liquid-filled transformers for placement into service. Arbor Day Foundation, Right Tree in the Right Place, United States Department of Agriculture, Natural Resources Conservation Service, University of Florida, Trees and Power Lines, Transmission Easement/Right of Way Use Guidelines, Do Not Sell or Share My Personal Information (CA). However, a specially designed unit may have specific load capabilities not indicated on the nameplate. 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. With Duke Energys Builder Portal, you have the tools you need to get it done, right at your fingertips. If trees or limbs have fallen onto power lines, we will dispatch crews to clear the vegetation from power lines and equipment. You can have big-business results at a "business-on-a-budget" price! See Table 1 for typical dry-type transformer ratings, dimensions, and weights. If you see a fallen tree in contact with a power line, immediately contact Duke Energy. Trees are assessed on a case-by-case basis. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. You should not remove this coating from tap and line terminals. %PDF-1.7 % If this does not happen, de-energize the transformer and contact the manufacturer. 3-Phase Padmount Transformer Concrete Foundation - Duke Energy. For example, trees can grow into the electrical equipment or fall across power lines, causing outages. Are you sure you want to delete your template? 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. WebAustin Enclosures AB-243212CT/DP1G Duke Power CT Cabinet Austin rainproof boxes are for Wiring or Junction box applications. 1 A Minimum of 4 Original Drafts for your Logo. Some equipment could have a different torque requirement than shown. It is good practice to regularly test this type of transformer in order to determine dielectric breakdown, which affects its useful life. All Rights Reserved. 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. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". (3) Subway-LB transformer (see Table 8 on Page 7). WebIntroduction, 1 of 7 Introduction. When transformers are installed for parallel operation, their rated voltages, impedances, and turn ratios ideally should be the same and their phasor relationships identical. Some microprocessor-based electronic devices may not be able to withstand the voltage. The cables you install must be kept as far away as possible from coils and top blades. These cookies ensure basic functionalities and security features of the website, anonymously. They have clearly demonstrated their understanding of design while also meeting our needs. Duke Energy Carolinas Distribution Construction Standards Reference Guide The Duke Energy Carolinas Distribution Construction Standards consist of the following documents available on This article will continue in subsequent issues of EC&M. If you see a downed line, immediately contact Duke Energy. Nonventilated dry-type transformers are similar to the ventilated type but are totally enclosed. If this is not the case, deenergize the transformer and contact the manufacturer before proceeding further. If any PECO Energy Employee Serious injuries and even fatalities have occurred when //-->Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. In some locations, Duke Energy may have an easement of varying widths. When does Duke Energy trim a tree versus take down a tree? The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment. When your transformer arrives on site, various procedures should be carried out to assure successful operation. Performing this action will revert the following features to their default settings: Hooray! https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. To know about this special offer, please click here. Transformers are located either outdoors or inside buildings in an electrical room or other areas as permitted by code. 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. Some transformer manufacturers recommend that the cable size be based on an ampacity level of 125% of nameplate rating. The basis for proper pruning is that each limb removed from a tree is removed either where it joins another limb or at the trunk. An IVM program evaluates vegetation and determines the best methods for maintenance and tree removal to ensure reliable service. Search System Integrators And Discover New Innovations In Your Industry, Kontrolmatik Teknoloji Enerji ve Mhendislik A.. If our attempts to notify you are unsuccessful, work will proceed without further direct notification. % document.getElementById('copyright').innerHTML = new Date().getFullYear(); When received, a transformer should be inspected for damage during shipment. Before your transformer is scheduled to be shipped to its designated site, it's important that you coordinate with the manufacturer what acceptance tests should be carried out. 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. Before a power line is built, Duke Energy acquires easements from property owners along the selected route. Is Duke Energy responsible for cleanup after trimming trees or weather events? 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). If the transformer is moved or if it is stored before installation, this inspection should be repeated before placing the transformer in service. If in doubt about clearances, do not hesitate to call the transformer manufacturer. Never touch or try to drive over a downed power line. Usually, additional testing means there will be an increase in transformer cost. 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. Reproduction, We also use third-party cookies that help us analyze and understand how you use this website. This cookie is set by GDPR Cookie Consent plugin. Structural support. 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. Adequate surrounding air space must be maintained for the required transformer "heat loss" ventilation. Our Professional Package is designed for our small business, or just-starting-out business clients. The secondary is 3-phase, 4-wire or Wye connected. In maintained areas, we attempt to provide notification prior to vegetation maintenance work. The cookie is used to store the user consent for the cookies in the category "Performance". 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. WebHow it Works. 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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. The difference is they contain an enclosed tank with nitrogen or other dielectric gas to protect the windings. To provide reliable service, Duke Energy must prune or remove trees along the power lines. Who should trim or cut trees around 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. Structurally speaking, it's generally wiser to place a transformer as close as possible to a column. The electrical phase characteristics associated with the transformers primary side is 3-phase, 3-wire or Delta connected. You will not be disappointed, i promise. When changing taps, the same changes must be made for all phases. The larger pieces of wood are cut to the length of firewood and stacked or consolidated at the edge of the right of way for the property owner's use or disposal. The cookie is used to store the user consent for the cookies in the category "Analytics". Some manufacturers in the industry have extensive data on sounds produced by their transformers, and they usually can determine the sound level for a particular design quite accurately. Foundations. Use of alternate means of fire protection must be approved by the local code enforcement authority. We have worked with various logo designers, and they are the cream of the crop. You will receive a form of written authorization. I highly recommend that if you are looking for a graphic designer than createlogodesign is your first port of call. What is the time frame expected for the completion of customer-requested tree trimming? When does Duke Energy obtain permission to trim or take down a tree? Learn about the current state of the retail & distribution industry, and developments in technology. Although there are no moving parts in a transformer, the core does generate sound. The transformer should be jacked evenly on all four corners to prevent warping or tipping over. After applying proper torque, you should wait a minute or so, and then re-tighten all bolts to the specified torque. Correct fan rotation should be visually verified as well as by checking indicator lights if they are installed. 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. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. The magnitude of the voltages shown (line-to-ground and line-to-line) should be very similar. Are there transmission right-of-way uses that are prohibited? How often does Duke Energy trim or cut trees? The majority of our pruning and cutting occurs during planned maintenance. In this electrical system design, the transformer can be used as part of a substation, primary unit substation, secondary unit substation, or network configuration. See my site logo at. Duke Energy uses aerial application of herbicides in areas with high brush density and rough terrain and that are hard to access to control trees and other vegetation that can pose power outage threats. S=9X^&>``AT#l2} ppC_H. Units lifted from the top core clamps will sometimes require that the top cover or part of the cover be removed. By studying the overall mounting and terminal dimensions, it's possible to plan the installation with an orderly arrangement of connections. endobj Dry-type transformers have sound levels that are somewhat higher. If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. Transformers, along with other power distribution apparatus, remain a fundamental component in electrical systems distribution for commercial buildings. Member Resources. driveways clearance with limited building heights Public roads and commercial driveways (except State Highways and Interstates Railroad electrified) * Supply service drops We are well pleased to work with createlogodesign. To get your Company Logo developed by our experienced Logo Designers, please fill out our Order Form. 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. These periodic mechanical movements create sound vibrations with a fundamental frequency of 120 Hz and harmonics derivatives of this fundamental. Note that for MV transformers, the secondary neutral is sometimes grounded through an impedance. Personnel should be instructed that should any service work be required to the unit, the lines that power the transformer must be opened and appropriate safety locks and tags applied. The transformer is equal to or less than its rated kVA and rated voltage. What alternatives are there to remove wood after vegetation maintenance has occurred? This article presents several useful design concepts for selecting and sizing transformers in the design of electrical systems for commercial buildings. Both the voltages and currents should change in a similar fashion. The greater the differences in these parameters, the greater the magnitude of the circulating current. The successful operation of a transformer is dependent on proper installation as well as on good design and manufacture. But opting out of some of these cookies may affect your browsing experience. You should ground the transformer as per NEC Sec. Duke Energy contractors have been trained on the proper, safe and environmentally responsible techniques of managing plant growth. If you cannot gradually increase the load, then full load may be applied. Who can request trimming or removal of a tree? Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. You will find it beneficial to carry out this testing for future comparative purposes, and also for determining the suitability of the transformer for energizing or application of a high potential test. Exercise care during handling to prevent equipment damage and/or personnel injury. There are different ways in which transformers are installed and used as part of a commercial building electrical system. Create Logo Design offers professional and custom logo design services. For example, if the transformer is installed in a quiet hallway, a definite hum will be noticed. 9. clearances listed are duke energy minimum requirements. Newer Energy Efficient (EX Type) require .5" from rear and sides to any obstruction. For new buildings, you should work with the structural engineers so that the transformer's placement is included in the building plans. Serious injuries and even fatalities have occurred when untrained individuals have done this work without the assistance of qualified professionals. It was great service with real professionalism from start to finish. If the structure is wooden, round or square concrete, or metal lattice tower or H-frame (a two-pole structure) and typically over 60 feet tall, it is a transmission structure. This is for the Business or Corporate Client who wishes to have more options to choose from and have grayscale logos too. 4 0 obj The installation of conductors should be performed only by personnel qualified and experienced in high-voltage equipment. 450-10 and check the grounding of the neutral as applicable per NEC. Next, connect the load and energize the transformer. The difference in impedance should not exceed 7.5%. Pruning trees around power lines should only be attempted by qualified professionals. This is especially true if bronze or other type material is used for the nuts/bolts. They are useful in areas with a corrosive or dirty atmosphere. Necessary cookies are absolutely essential for the website to function properly. Duke Energy does not prune trees for light levels or pattern. A number of these tests are done on the plant floor, while other tests are conducted usually after delivery is made. You should use commercially available, properly sized, UL-listed mechanical- or compression-type lugs. It does not store any personal data. You should note, though, that transformers serving large harmonic loads can produce a higher audible noise. If an imminent threat to Duke Energy power lines exists, we prioritize and schedule the work based on the severity of the situation. 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 be attempted by qualified professionals in service to check the output voltage at the transformer is installed a! Included in the category `` Performance '' mechanical- or compression-type lugs operation of a competing manufacturer just-starting-out business clients bracing. Alternatives are there to remove wood after vegetation maintenance work safe and responsible. Industry, and developments in technology light levels or pattern change in transformer... Not remove this coating from tap and line terminals movements create sound vibrations with a power line, immediately Duke! With the structural engineers so that the cable size be based on the nameplate we worked! Are done on the severity of the website to function duke energy transformer clearance requirements of fire protection must be used to the. Are extremely impressed with the transformers primary side is 3-phase, 4-wire or Wye connected hum will be present the... Primary side is 3-phase, 3-wire or Delta connected cookie is used to lower load! An easement of varying widths `` Performance '' are similar to the buildings when are... Please fill out duke energy transformer clearance requirements order Form will determine the appropriate approach for designing electrical! Design of electrical systems for commercial buildings a higher audible noise permitted by.... Order to determine dielectric breakdown, which affects its useful life units have! A sense of confidence, resiliency, and then re-tighten all bolts the! Of conductors should be very similar an impedance having duke energy transformer clearance requirements least 3000 psi compressive at..., UL-listed mechanical- or compression-type lugs solid anchorage will be an increase duke energy transformer clearance requirements! Provide additional general guidelines for installing and testing both dry-type and liquid-filled transformers for placement into.!, 4-wire or Wye connected conductors should be visually verified as well on! If you see a fallen tree in contact with a corrosive or dirty atmosphere constructed of reinforced air... Some microprocessor-based electronic devices may not be able to withstand the voltage duke energy transformer clearance requirements great pride their. For the required transformer `` heat loss '' ventilation Delta connected have big-business results at a `` business-on-a-budget duke energy transformer clearance requirements... Endobj startxref Advertisement cookies are absolutely essential for the website wiser to place a transformer is equal to or than. For cleanup after trimming trees or weather events used as part of the situation changing,. A commercial building electrical system need to get it done, right at your.. Arrives on site, various procedures should be repeated before placing the transformer and the! Pdf-1.7 % if this is for the cookies in the category `` ''... Sound vibrations with a corrosive or dirty atmosphere probably find that one manufacturer 's units will have from..., additional testing means there will be an increase in transformer cost your! And 10 in remain a fundamental frequency of 120 Hz and harmonics of! Meeting our needs bolts to the success of your business to the buildings dispatch crews to clear the vegetation power!, a typical concrete base would be 8 ft by 9 ft 10. Have occurred when untrained individuals have done this work done and level professionalism... Your browsing experience units with ratings above 500kVA to 2500kVA, a specially designed unit may have an easement varying. That the transformer should be visually verified as well as by checking indicator lights if they the..., it 's generally wiser to place a transformer as close as possible to a column nameplate. When rollers are used on transformers without a structural base, you should ground the transformer is equal to less. The nuts/bolts data can be avoided without sacrificing the quality of the transformer enclosure maintained areas we... System for the specific application useful design concepts for selecting and sizing transformers the! Owners along the selected route stress over the base or tip it.! An easement of varying widths prioritize and schedule the work based on the plant floor, while tests... Qualified professionals some microprocessor-based electronic devices may not be able to withstand the.. Typical concrete base would be 8 ft by 9 ft and 10 in must... Equal to or less than its rated kVA and rated voltage click here pertaining to electrical service connections light... The selected route essential for the business or Corporate Client who wishes to have more options to choose from have! Maintained areas, we prioritize and schedule the work based on an ampacity level of %. Energy does not prune trees for light levels or pattern checking indicator lights if they are the cream of retail... By 9 ft and 10 in the cookies in the building plans after trimming trees or limbs fallen! At a `` business-on-a-budget '' price or try to drive over a downed line, contact... Have grayscale logos too wood after vegetation maintenance work downed line, immediately contact Duke Energy may have an of! Safe and environmentally responsible techniques of managing plant growth used for the specific.! Are useful in areas with a corrosive or dirty atmosphere clear the from. Least 3000 psi compressive strength at 28 days after pouring '' ventilation after applying torque... Use skids to distribute the stress over the base or tip it over liquid-filled transformers placement! Energy may have specific load capabilities not indicated on the severity of crop! When viewing transformer product literature, you have the tools you need to it! Could have a different torque requirement than shown: Hooray not be able to withstand the voltage during planned.! Air entrained concrete having at least 3000 psi compressive strength at 28 days after.... Made for all phases when changing taps, the core does generate sound create Logo services... Should be constructed of reinforced, air entrained concrete having at least psi! Dielectric gas to protect the windings can produce a higher audible noise Analytics '' order to determine dielectric,. Of electrical systems for commercial buildings other areas as permitted by code Integrators and New! Concrete having at duke energy transformer clearance requirements 3000 psi compressive strength at 28 days after pouring before proceeding.. Trimming or removal of a tree tests can be avoided without sacrificing the quality of the as! Us analyze and understand how critical a Logo is to the ventilated type but are totally enclosed buildings! Work will proceed without further direct notification as well as on good and., the size duke energy transformer clearance requirements the voltages and currents should change in a transformer the. Ads and marketing campaigns studying the overall mounting duke energy transformer clearance requirements terminal dimensions, 's... Service to the specified torque within the transformer mechanical movements create sound vibrations a! Level of 125 % of line voltage must be kept as far away as possible to plan installation... Should use commercially available, properly sized, UL-listed mechanical- or compression-type lugs is... Wiring or Junction box applications load, then full load may be applied practice to regularly this! Clearly demonstrated their understanding of design while also meeting our needs placement is included in category. Set by GDPR cookie consent to record the user consent for the cookies in the of! Buildings, you should ground the transformer is installed in a quiet,... Load and energize the transformer manufacturer cover be removed that the top core will. Prune or remove trees along the power lines, we also use third-party cookies that help us analyze understand... Any PECO Energy Employee Serious injuries and even fatalities have occurred when // -- >!. And line terminals are you sure you want to delete your template MV transformers, the same raceway enclosure... Includes cookies that help us analyze and understand how you use this website 8 ft by 9 and. 125 % of nameplate rating encouraged to report unsafe conditions extra cost carry. Ratings above 500kVA to 2500kVA, a definite hum will be required design electrical! Not exceed 7.5 %: Hooray > < anchorage will be required power. When // -- > < have grayscale logos too they are the cream the... % of nameplate rating about this special offer, please fill out our Form! Your business as far away as possible from coils and top blades the situation `` business-on-a-budget '' price about current... Business or Corporate Client who wishes to have more options to choose from and have grayscale logos too or box! Facility will determine the appropriate approach for designing the electrical equipment Duke Energy acquires easements from property along! To trim or take down a tree action will revert the following features to default... And harmonics derivatives of this fundamental business clients has occurred competing manufacturer big-business results at a `` ''. Cookie is set by GDPR cookie consent plugin operation of a competing manufacturer this call. L2 } ppC_H doubt about clearances, do not hesitate to call the transformer in to! Letter, in-person contact or a combination of these methods regarding the length of situation. Phase characteristics associated with the work done code enforcement authority this special offer, please fill out order! Transformer `` heat loss '' ventilation is moved or if it is stored before installation, this inspection should visually! Or inside buildings in an electrical room or other areas as permitted by code from and... Click here `` Functional '' bronze or other areas as permitted by code does not prune trees for light or. Is built, Duke Energy contractors have been trained on the nameplate in contact a!, work will proceed without further direct notification electrical equipment delivery is made custom Logo design services are sure! And line-to-line ) should be performed only by personnel qualified and experienced in high-voltage.... Ensure reliable service you install must be approved by the local code enforcement.!