2023 Endeavor Business Media, LLC. Caution is required when operating in parallel. "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} In this electrical system design, the transformer can be used as part of a substation, primary unit substation, secondary unit substation, or network configuration. Webrequirements. This material will provide additional general guidelines for installing and testing both dry-type and liquid-filled transformers for placement into service. A point of contact will be provided should you have questions or concerns about the upcoming vegetation work. When a Customer does his own wiring, he will be considered the electrical contractor for the purpose of these requirements. Pruning trees around power lines should only be attempted by qualified professionals. 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. Newer Energy Efficient (EX Type) require .5" from rear and sides to any obstruction. When speaking to consulting engineers on this topic, we've found that they recommend the cable be sized for the transformer's nameplate rating. 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. Other site considerations require closer analysis. Before specifying any additional tests, you should contact the manufacturer to find out what data it has accumulated from testing essentially duplicate units. 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. The magnitude of the voltages shown (line-to-ground and line-to-line) should be very similar. If the transformer is moved or if it is stored before installation, this inspection should be repeated before placing the transformer in service. Check all of the tap jumpers for proper location and for tightness. Transformers are designed with provisions for lifting, jacking, and/or rolling. By studying the overall mounting and terminal dimensions, it's possible to plan the installation with an orderly arrangement of connections. Thanks! Does Duke Energy use herbicides to control vegetation in rights of way? Correct fan rotation should be visually verified as well as by checking indicator lights if they are installed. It shall be the customers 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. 450-12 on Terminal Wiring Space. %PDF-1.5 % Before a power line is built, Duke Energy acquires easements from property owners along the selected route. This is for the Business or Corporate Client who wishes to have more options to choose from and have grayscale logos too. But opting out of some of these cookies may affect your browsing experience. If the unit is installed in a location it shares with other equipment such as motors, pumps, or compressors, the transformer hum will go unnoticed. This cookie is set by GDPR Cookie Consent plugin. These cookies do not store any personal information. Are there transmission right-of-way uses that are prohibited? 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). The cookie is used to store the user consent for the cookies in the category "Analytics". thick with chamfered edges on top of the base and footings extending 20 in. We offer a 100% Satisfaction Guarantee. Other factors that should be considered in selecting transformers are voltage ratings for both primary and secondary, voltage taps, efficiency, impedance value, type of cooling and temperature rise, voltage insulation class, basic impulse level, and sound level. If trees or tree limbs fall and tear down power lines, the downed power lines may still be energized while in the air or on the ground. 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 %PDF-1.7 % The right tree or shrub, planted in the right place, can give you years of beauty and value without the potential dangers of getting too close to power lines. 1 0 obj 78 0 obj <>stream Adequate surrounding air space must be maintained for the required transformer "heat loss" ventilation. Serious injury or death may result from climbing a tree and making direct contact with or coming too close to an energized line. With the exception of emergency situations, we attempt to ask permission of the property owner before taking down trees in maintained or landscaped areas. North America | April 5, 2018. The tap setting should also be verified for the proper voltage. We are well pleased to work with createlogodesign. Non-ventilated Transformers should be a minimum of 3 inches from any obstruction on all sides and top. Who can request trimming or removal of a tree? No one should climb trees that are in the vicinity of power lines. 7. Part 3 will cover installation procedures for liquid-filled transformers that are shipped unassembled. Torque specifications are sometimes listed on the hardware. YUMPU automatically turns print PDFs into web optimized ePapers that Google loves. How it Works. With Duke Energys Builder Portal, you have the tools you need to get it done, right at your fingertips. However, their operating principles will remain with the same. clearances, it is the responsibility of the builder or owner to notify PECO Energy and make arrangements to achieve proper clearances or barriers. Such stress could cause a bushing to crack or a connection to fail. Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. //-->stream To simplify installation, you should request from the manufacturer a simplified outline drawing of the transformer. You will receive a form of written authorization. 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. 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 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. Our Premiere Package includes all desirable "upgrades". This article will continue in subsequent issues of EC&M. They are very professional, and the team knows their craft. 0 0 For information about planning and planting vegetation around electrical facilities please visit: Yes, Duke Energys rights of way in non-landscaped/unmaintained areas are initially mowed, making identification of compatible versus incompatible species impractical. Our interactions and communication throughout our project were flawless. When we can properly trim the tree to allow sufficient clearance until the next scheduled trim cycle, we make every effort to only trim the tree. To provide reliable service, Duke Energy must prune or remove trees along the power lines. 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. For new buildings, you should work with the structural engineers so that the transformer's placement is included in the building plans. Often the location and the method in which a transformer is placed have much to do with the perceived sound as does the actual decibels generated. If this is not the case, deenergize the transformer and contact the manufacturer before proceeding further. Serious injuries and even fatalities have occurred when untrained individuals have done this work without the assistance of qualified professionals. I highly recommend that if you are looking for a graphic designer than createlogodesign is your first port of call. Exercise care during handling to prevent equipment damage and/or personnel injury. 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 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. hb```7,^ cb'60H6wZ $(|`n`h`` ``{_j j[e13b{@38O=)HpG17hCDC i. Watch Jana's Story. We employ lateral and directional pruning methods endorsed by tree care professionals. When received, a transformer should be inspected for damage during shipment. 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. Also, with this information, it will be easier to plan site arrangements. endstream endobj startxref Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. If you see a downed line, always assume it is energized and stay away. We also use third-party cookies that help us analyze and understand how you use this website. A note of caution: The information presented here is not meant to supersede any manufacturer's instructions. In addition, to avoid problems, a civil engineer should be consulted for guidance on the above matters. There are instances when a tree must be trimmed or removed outside of planned maintenance. The finish on the logo was outstanding, and consequently we are looking to work with them on future projects. In addition, a good design and installation require the proper transformer feeder and overcurrent protection device size based on NEC articles 240, 250, 450, and applicable sections of Article 310 (Figure 2). How often does Duke Energy trim or cut trees? These periodic mechanical movements create sound vibrations with a fundamental frequency of 120 Hz and harmonics derivatives of this fundamental. Why do you apply herbicides via helicopter? ; 3 Then we will refine your Logo until you are 110 % satisfied! For harmonic mitigation, K-rated transformers can be combined with harmonic filters or chokes. If this does not happen, de-energize the transformer and contact the manufacturer. The greater the differences in these parameters, the greater the magnitude of the circulating current. 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. 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). Transformers are usually designed and built to provide good electrical connections using either copper or aluminum cable. The expense associated with testing represents a larger portion of a small transformer's cost compared with the testing cost of a large kVA unit. It does not store any personal data. There should be no attempt to handle a transformer in any other position. While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. Here, a transformer turns ratio indicator should be used to measure the ratio. Are you sure you want to delete your template? thick with chamfered edges on top of the base and footings extending 20 in. 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. In some locations, Duke Energy may have an easement of varying widths. Serious injuries, and even fatalities, have occurred when unqualified individuals perform this type of work without the assistance of qualified professionals. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> They are useful in areas with a corrosive or dirty atmosphere. How do I request tree trimming or tree removal by Duke Energy? You will not be disappointed, i promise. These cookies will be stored in your browser only with your consent. When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. 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 K-rated transformers do not mitigate or eliminate harmonics. WebRequirements 1) It shall be the contractor's responsibility to secure the Power Company's approval prior to applying for a permit. What can I do in a transmission right of way? Any control circuits, if any, should be checked to make sure they function correctly. Duke Energy discourages customers from working around power lines and electrical equipment. The development was easy because Steffi provided unlimited revisions, so we went through a series of small changes until we got a final. Never touch or try to drive over a downed power line. The first set of logo ideas were terrific. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k, `h`` ``{_j j[e13b{@38O=)HpG17hCDC i. The most common building industry standard ratings are 3, 6, 9, 15, 30, 37.5, 45, 75, 112.5, 150, 225, 300, 500, 750, and 1,000 kVA. Distribution poles are typically the smaller poles seen following roads or property lines through subdivisions and have connections directly to homes or businesses. We do not round trees over because it contributes to poor tree health. The insulation resistance test should be conducted immediately prior to energizing the transformer or the beginning of the dielectric test. Transformers, along with other power distribution apparatus, remain a fundamental component in electrical systems distribution for commercial buildings. Units lifted from the top core clamps will sometimes require that the top cover or part of the cover be removed. The maximum continuous load a transformer can handle is indicated on its nameplate. Next, connect the load and energize the transformer. Structural support. Installing transformers in existing structures may require an analysis of the building for structural support capability since the original structural information may not be available. We have worked with various logo designers, and they are the cream of the crop. Createlogodesign were fantastic. This was our second project and I knew exactly who I wanted to work with. Before you plant a tree or shrub, please make sure the location is out of the right of way of overhead power lines and away from underground power lines and other utilities. endstream endobj startxref All Rights Reserved. See Table 1 for typical dry-type transformer ratings, dimensions, and weights. 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. Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. In addition, the size of the commercial facility will determine the appropriate approach for designing the electrical distribution system for the specific application. They were very attentive to our needs, very detailed with their work, and met the needs of our timetable. 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. This is especially true if bronze or other type material is used for the nuts/bolts. Should a transformer be built to meet special requirements, however, then some additional testing is recommended to ensure that the unit operates as called for. The transformer is equal to or less than its rated kVA and rated voltage. These provisions will vary depending upon the weight, size, and mechanical configuration of the unit. %PDF-1.5 Necessary cookies are absolutely essential for the website to function properly. Duke Energy does not prune trees for light levels or pattern. This cookie is set by GDPR Cookie Consent plugin. This cookie is set by GDPR Cookie Consent plugin. Representative torque requirements for making connections using steel nuts/bolts are shown in Table 1, on page 42. 52 0 obj <> endobj You may also hire a company to remove the debris or contact your local public works to see if they remove yard debris. You can have big-business results at a "business-on-a-budget" price! n"fyuAf[vz}:L3h0vjB)ta=T5MFKV3!YyeQ.\A?|1a/9 yQQ1KR8N:@Q.LCmGwP72juW*QW_8"DyP3(\gjQ8qCZA{xGW*-EETOzk~h+,I`=p 3 The cookie is used to store the user consent for the cookies in the category "Performance". With your ideas in mind, our skilled logo designers will be quick and creative enough to create an eye-catching logo. For linear load applications, transformers should be selected with lower core losses. To avoid problems, you should follow the instructions provided by the transformer manufacturer. We also use third-party cookies that help us analyze and understand how you use this website. Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites 7. The specific requirements start in 110.26 (A) and refer to "equipment operating at 1000 volts, nominal, or less to ground andlikely to require examination, adjustment, servicing, or maintenance while energized". I guess the key is whether transformers are likely to requireexamination, adjustment, servicing, or maintenance while energized. Our site is customized based on your location. 2043 0 obj <> endobj The secondary is 3-phase, 4-wire or Wye connected. Well remember your selection for future visits. They have clearly demonstrated their understanding of design while also meeting our needs. Search System Integrators And Discover New Innovations In Your Industry, Kontrolmatik Teknoloji Enerji ve Mhendislik A.. 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. In addition, there are other specific requirements based on the transformer type, such as weatherproof enclosures for dry-type transformers installed outdoors or a transformer vault room for oil-insulated transformers installed indoors. Duke Energy to invest $36B on power projects by 2026. We have a dedicated team of logo designers producing customized logo design solutions. If an imminent threat to Duke Energy power lines exists, we prioritize and schedule the work based on the severity of the situation. WebAustin Enclosures AB-243212CT/DP1G Duke Power CT Cabinet Austin rainproof boxes are for Wiring or Junction box applications. I found createlogodesign.com by searching the internet, and decided to try them out without a first hand referral. If our attempts to notify you are unsuccessful, work will proceed without further direct notification. Never attempt to check the output voltage at the transformer. Indoor transformers for nonlinear loads can be selected with a K rating, which allows the transformer to withstand nonlinear conditions in the electrical system. These cookies track visitors across websites and collect information to provide customized ads. They were great at following our directions to the letter, while adding their own creative flair. Large enclosed units with base frame type enclosures may be jacked using the base frame angles. 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. ; 4 Final files will be provided in any format. Under certain conditions, trees and tree limbs can conduct power if they come in contact with power lines. 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. Part 2 will address installation procedures for dry- and wet-type transformers, the latter being fully assembled. If this data can be used, the extra cost to carry out tests can be avoided without sacrificing the quality of the transformer. Some manufacturers require that the megohmmeter readings and date of energizing be sent to them within a specified time after the transformer is placed in service for the warranty to be valid. 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. [ILLUSTRATION FOR FIGURE 2 OMITTED]. Your file is uploaded and ready to be published. This cookie is set by GDPR Cookie Consent plugin. endstream endobj 2044 0 obj <>>>/Pages 2032 0 R/StructTreeRoot 707 0 R/Type/Catalog>> endobj 2045 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 2046 0 obj <>stream gz&E6;ZdEv;z~gx Otherwise, they can be installed on open walls or steel columns or above suspended ceilings. These application types include: Indoor distribution transformers are used with panelboards and are separately mounted to supply the specific electrical load requirements in a system-specific application within the system distribution. Occasionally, the installation of some method of sound abatement will be called for. 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 The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment. Standard transformer tests performed for each unit include the following: * Polarity for single- and 3-phase units (because single-phase transformers are sometimes connected in parallel and sometimes in a 3-phase bank); * Phase relationship for 3-phase units (important when two or more transformers are operated in parallel); * Excitation current, which relates to efficiency and verifies that core design is correct; * No-load core loss, which also relates to efficiency and correct core design; * Resistance, for calculating winding temperature and [I.sup.2]R component of winding losses (usually not required on 600V class units); * Impedance (via short circuit testing), which provides information needed for breaker and/or fuse sizing and interrupting rating and for coordinating relaying schemes; * Load loss, which again directly relates to the transformer's efficiency; * Regulation, which determines voltage drop when load is applied; and. When selecting a tree or shrub to plant, it is just as important to consider what you plant as it is where you plant. Business Card, Are there any special circumstances that would cause Duke Energy to limit tree pruning to less than a specified distance on either side of the right of way centerline? 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). Exception: Meter socket and current Also, you should arrange for a one-minute, 1200V insulation resistance test of the control circuits. And, each manufacturer will have its own instructions for installing and testing its transformers. The electrical size of the transformer load is rated in kVA. The revisions were done quickly and to my specifications, and often I was provided multiple versions from which to select. Some microprocessor-based electronic devices may not be able to withstand the voltage. You also have the option to opt-out of these cookies. Roles and Responsibilities Associated with Clearances, 1 of 8 Planned maintenance is prioritized by evaluating reliability data, field conditions and other specific information. For example, if the transformer is installed in a quiet hallway, a definite hum will be noticed. Transmission Systems .
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