9. clearances listed are duke energy minimum requirements. They gave us 6 logo ideas to start with. You should not remove this coating from tap and line terminals. You may also hire a company to remove the debris or contact your local public works to see if they remove yard debris. You will receive a form of written authorization. Click here to start this process. This does not apply to bottom ventilation openings. Contact Duke Energy to request a representative to make evaluations of your request. Representative torque requirements for making connections using steel nuts/bolts are shown in Table 1, on page 42. Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites Your Satisfaction is Guaranteed! What fantastic professionals to work with. 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. 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. (Most of the information in these standards also can be applied to liquid-filled transformers.). 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. h[oWcp :\_H84$p~U==$W9A{fzQ!wZkzjgybveni\+\-\z&w:%HE*:Er;cWc Hint: Duct Tape to the Rescue. Copyright www.CreateLogoDesign.com. Foundations. September 14, 2022. 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. Our understanding of their general characteristics will allow the designer and end user to make the proper selection for the electrical system application. Oil-filled transformers are constructed with the windings encased in an oil-tight tank filled with insulating mineral oil. I highly recommend that if you are looking for a graphic designer than createlogodesign is your first port of call. When specifying a transformer to be operated in parallel with existing units, all these parameters should be discussed with the transformer manufacturer. After I submit activities, construction or landscaping plans, what type of authorization will I receive for the use of a Duke Energy easement? Duke Energy schedules periodic vegetation maintenance along power lines to minimize outages caused by trees in or near transmission and distribution rights of way. However, after the non-landscaped/unmaintained area is mowed, follow-up herbicide applications are applied to the volunteer, woody vegetation that is incompatible within the rights of way. In this electrical system design, the transformer can be used as part of a substation, primary unit substation, secondary unit substation, or network configuration. The difference in impedance should not exceed 7.5%. You should note, though, that transformers serving large harmonic loads can produce a higher audible noise. 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. Ensure that all grounding or bonding systems meet NEC and local codes. A point of contact will be provided should you have questions or concerns about the upcoming vegetation work. 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. The ESR Manual provides guidance and instructions pertaining to electrical service connections. it windows (first story) 10 10 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. When changing taps, the same changes must be made for all phases. 0 Click on Yes, I agree to go directly to the website or click on Cookie Policy to view detailed descriptions of the cookies used on the website. If the transformer is moved or if it is stored before installation, this inspection should be repeated before placing the transformer in service. 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 This category only includes cookies that ensures basic functionalities and security features of the website. Createlogodesign were fantastic. 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. However, if the tree poses a significant reliability risk or cannot be trimmed in a way that provides sufficient clearance until the next scheduled trim cycle while maintaining its health, the tree may be taken down. But opting out of some of these cookies may affect your browsing experience. If you see a downed line, always assume it is energized and stay away. Our programs objective is to minimize tree-related power outages in a manner that is consistent with good arboricultural practices. Also, it's a matter of cost. 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. If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. Units lifted from the top core clamps will sometimes require that the top cover or part of the cover be removed. document.getElementById('copyright').innerHTML = new Date().getFullYear(); createlogodesign provided very impressive artwork for our projects and does so in a very timely, efficient manner. This cookie is set by GDPR Cookie Consent plugin. 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. [ILLUSTRATION FOR FIGURE 2 OMITTED]. 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. While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. 300.2 METERED AND UNMETERED CONDUCTORS . To know about this special offer, please click here. Larger units will have provisions for lifting from the base frame or from clamps at the top of the core. Webrequirements. Note that for MV transformers, the secondary neutral is sometimes grounded through an impedance. How it Works. 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. %%EOF When your transformer arrives on site, various procedures should be carried out to assure successful operation. Correct fan rotation should be visually verified as well as by checking indicator lights if they are installed. None of our competitors offer this kind of unique service. 0 Electrical Service Requirements (ESR) Current as of October 28, 2022 The ESR Manual provides guidance and instructions pertaining to electrical service connections. Adequate surrounding air space must be maintained for the required transformer "heat loss" ventilation. 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. 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. Transmission easement documents can be located in their respective countys deeds and records department. Torque specifications are sometimes listed on the hardware. 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. See my site logo at. 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. endstream endobj startxref Such stress could cause a bushing to crack or a connection to fail. ; 4 Final files will be provided in any format. 1 0 obj hbbd```b``z"H-dfH`?dirdl"?$L@{b`Ig` / The same adjustment should be made to compensate for voltage drop in the output due to long cable runs. When is tree trimming considered an emergency? They are very professional, and the team knows their craft. These cookies ensure basic functionalities and security features of the website, anonymously. 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. (If the power transformer has CT circuits, they should be closed.) They can be installed outdoors or indoors. When a Customer does his own wiring, he will be considered the electrical contractor for the purpose of these requirements. These terminations should be attached to the cables as specified by the termination or cable manufacturer. This was our second project and I knew exactly who I wanted to work with. This website uses cookies to improve your experience while you navigate through the website. If these parameters are different, circulation current will exist in the circuit loop between these units. 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 this data can be used, the extra cost to carry out tests can be avoided without sacrificing the quality of the transformer. Another consideration for indoor distribution transformers is the type of load: linear or nonlinear. A number of these tests are done on the plant floor, while other tests are conducted usually after delivery is made. . Develop a procedure for inventory of all tools, hardware, and any other objects used in the inspection, assembly, and testing of the transformer. I was so impressed with the finished result that I've asked them to undertake future work. The cookie is used to store the user consent for the cookies in the category "Analytics". For harmonic mitigation, K-rated transformers can be combined with harmonic filters or chokes. We work diligently to capture the look and feel that you always desired for your logo. For linear load applications, transformers should be selected with lower core losses. Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. Our objective is to promote low-growing vegetation to minimize potential electric power interruptions, which also enhances wildlife habitat. The harmonics resulting from nonsinusoidal currents generate additional losses and heating of the transformer coils, which reduce the transformer life expectancy. When the load-side voltage is low, tap connections below 100% of line voltage must be used to raise the load voltage. Review our, Ralph Baeza, PE, LEED AP, TLC Engineering for Architecture, Miami, Offices codes and standards change, accommodating new work styles, Codes, standards cause health care building design model to shift, Manufacturing and industrial building codes and standards trends, Codes and standards drive trends, changes in data center design, Technology drives K-12 school changes, while meeting codes and standards, Consulting-Specifying Engineer most-viewed codes and standards articles in 2022. more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) However, a specially designed unit may have specific load capabilities not indicated on the nameplate. 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. Compatible species are not targeted for herbicide application. 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. Duke Energy does not prune trees for light levels or pattern. down from each of the ends of the long sides. Even mounting the unit a distance that is an exact multiple of the 120 Hz wavelength from a solid reflective surface may reinforce the sound waves, causing the transformer to seem louder than it actually is. If our attempts to notify you are unsuccessful, work will proceed without further direct notification. Will I be notified before a tree crew comes to cut trees in my yard? Air intake openings in the wall may be necessary or a larger minimum surrounding We also use third-party cookies that help us analyze and understand how you use this website. They are useful in areas with a corrosive or dirty atmosphere. Occasionally, a property owner will make the decision to conduct trimming or removals on their own or hire a third party. Letterhead and If you cannot gradually increase the load, then full load may be applied. It's important that you have an understanding of the manufacturer's warranty. 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? Planned maintenance is prioritized by evaluating reliability data, field conditions and other specific information. We believe it speaks for itself. 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. The cookie is used to store the user consent for the cookies in the category "Performance". An article on how to choose a transformer based on the latter criteria appeared in the May '96 issue of EC&M. YUMPU automatically turns print PDFs into web optimized ePapers that Google loves. endobj The maximum continuous load a transformer can handle is indicated on its nameplate. Selecting, sizing transformers for commercial buildings, By using this website, you agree to our use of cookies. Transformers change voltage levels to supply electrical loads with the voltages they require. 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. Serious injuries, and even fatalities, have occurred when unqualified individuals perform this type of work without the assistance of qualified professionals. 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 you are looking for someone who are able to produce EXACTLY what you want, this is the place to go with. ;w]S9 V?O|H?&V+f[^ c#7b0#M>*. Nonventilated dry-type transformers are similar to the ventilated type but are totally enclosed. Till date we have designed more than 5,000 business logos. Then, without connecting the load, energize the transformer. The transformer should be jacked evenly on all four corners to prevent warping or tipping over. Structurally speaking, it's generally wiser to place a transformer as close as possible to a column. For a limited time we are offering our logo design services for $29 only. The installation of power transformers and transformer vaults must comply with the requirements of National Electrical Code (NFPA 70) article 450 and specific local authority having jurisdiction requirements. When placed inside or on top of a building, you must consider structural capabilities because a transformer represents a highly concentrated load. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. 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