%PDF-1.6 % He is a registered professional engineer with more than 29 years of experience in electrical engineering, project management, building design, and construction. ; 3 Then we will refine your Logo until you are 110 % satisfied! hkO0ibv*JmG[$ Who can request trimming or removal of a tree? These periodic mechanical movements create sound vibrations with a fundamental frequency of 120 Hz and harmonics derivatives of this fundamental. 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. To avoid problems, you should follow the instructions provided by the transformer manufacturer. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr 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. thick with chamfered edges on top of the base and footings extending 20 in. Grounding is necessary to remove static charges that may accumulate and also is needed as a protection should the transformer windings accidentally come in contact with the core or enclosure (or tank for wet types). Any control circuits, if any, should be checked to make sure they function correctly. After installation, you should check the output voltage of the transformer. This cookie is set by GDPR Cookie Consent plugin. Our goal is to provide professional logo design at an affordable price. In maintained or landscape settings, our policy is to dispose of any small limbs and brush. Thanks! In addition, to avoid problems, a civil engineer should be consulted for guidance on the above matters. This cookie is set by GDPR Cookie Consent plugin. These cookies do not store any personal information. Therefore, it's advisable that you seek guidance on this matter from an engineer knowledgeable in seismic supports and the associated code requirements. 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. Subsequently, covers or panels should be removed and an internal inspection should be made for damage or displacement of parts, loose or broken connections, dirt or foreign material, and for the presence of water or moisture. However, for low-voltage (600V and below) transformers, this is not practical. 0 Exception: Meter socket and current Jana Ganion, Sustainability and Government Affairs Director. Call, For additional information please visit our. Some principles to consider for transformer installation include locating them in isolated rooms with proper ventilation, clearances, and accessibility. Dangerous high voltage will be present within the transformer enclosure. When does Duke Energy trim a tree versus take down a tree? 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. Before energizing a 3-phase transformer, you should arrange to monitor the voltages and currents on the low-voltage side. Access to the Contractor Portal requires username and Planned maintenance is prioritized by evaluating reliability data, field conditions and other specific information. For example, the code-based demand load of a 208 Y/120 V, 3-phase, 4-wire panelboard is 42 kVA, which does do not include spare capacity for future growth. This may call for compromises regarding the length of the conductors going to and/or from 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. 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 When a Customer does his own wiring, he will be considered the electrical contractor for the purpose of these requirements. 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). They supply the required incoming electrical service to the buildings. 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 (3) Subway-LB transformer (see Table 8 on Page 7). Electrical Service Requirements (ESR) Current as of October 28, 2022 The ESR Manual provides guidance and instructions pertaining to electrical service connections. Most soils are able to withstand a bearing pressure of 2500 lbs/sq ft. [ILLUSTRATION FOR FIGURE 1 OMITTED]. As stated in the Occupational Safety and Health Authority (OSHA) standards and ANSI Z133, an unqualified person should not work within 10 feet of overhead power lines with voltages below 50,000 volts. If an imminent threat to Duke Energy power lines exists, we prioritize and schedule the work based on the severity of the situation. What is the time frame expected for the completion of customer-requested tree trimming? In this electrical system design, the transformer can be used as part of a substation, primary unit substation, secondary unit substation, or network configuration. We employ lateral and directional pruning methods endorsed by tree care professionals. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. 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. Part 2 will address installation procedures for dry- and wet-type transformers, the latter being fully assembled. Usually, lateral bracing and/or an extra solid anchorage will be required. We also use third-party cookies that help us analyze and understand how you use this website. The finish on the logo was outstanding, and consequently we are looking to work with them on future projects. After applying proper torque, you should wait a minute or so, and then re-tighten all bolts to the specified torque. //-->/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 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. Serious injuries, and even fatalities, have occurred when unqualified individuals perform this type of work without the assistance of qualified professionals. 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 Here, a transformer turns ratio indicator should be used to measure the ratio. You can have big-business results at a "business-on-a-budget" price! By studying the overall mounting and terminal dimensions, it's possible to plan the installation with an orderly arrangement of connections. Several transformer types rated higher than 600 V for oil insulated type, higher than 35,000 V for dry type, and other transformers rated higher than 600 V are required to be located in vault rooms, which must be built with fire-rated enclosures depending on the transformer type and applicable local authority requirements, when indoors. h[oWcp :\_H84$p~U==$W9A{fzQ!wZkzjgybveni\+\-\z&w:%HE*:Er;cWc 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. Transformers should be maintained in an upright position when being moved. Therefore, the transformer size required for converting the system voltage from 480 V, 3-phase, 3-wire to 208 Y/120 V, 3-phase, 4-wire is: Transformer size in kVA = 42 kVA x 1.25 = 52.5 kVA. The distance increases with voltage for all voltages equal to or higher than 50,000 volts. If you see a downed line, immediately contact Duke Energy. And, each manufacturer will have its own instructions for installing and testing its transformers. For transformers placed outside that are 2000kVA and above, you may wish to have the soil examined. This type can be installed in areas with corrosive or dirty atmospheric conditions where it would be impossible to use a ventilated-type transformer. Before energizing the unit, it's very important that you alert all personnel installing the transformer that lethal voltages will be present inside the transformer enclosure as well as at all connection points. Electric Service. All windings should be checked for continuity. 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. Till date we have designed more than 5,000 business logos. A note of caution: The information presented here is not meant to supersede any manufacturer's instructions. %%EOF The MIA South Terminal expansion was designed with about 50 transformers with similar intent as the stadiums but a more diverse group of loads for the 208 Y/120 V 3-phase, 4-wire system, which also included lighting loads, signage, telecommunication, security systems, and other loads part of this building project (Figure 1). We have a dedicated team of logo designers producing customized logo design solutions. 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. From the start Steffi was prompt and responsive. The location of a transformer relates directly to how noticeable its sound level appears. When changing taps, the same changes must be made for all phases. 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. It is obvious that CreateLogoDesign takes great pride in their work and rightly so. Check all of the tap jumpers for proper location and for tightness. 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. These cookies track visitors across websites and collect information to provide customized ads. Duke Energy schedules periodic vegetation maintenance along power lines to minimize outages caused by trees in or near transmission and distribution rights of way. 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. There are different construction types for transformers used in commercial buildings. Structurally speaking, it's generally wiser to place a transformer as close as possible to a column. These cookies ensure basic functionalities and security features of the website, anonymously. F3 H0i. ` RZ '' APqeT @ C of content and ads, and accessibility takes pride... The Contractor Portal requires username and Planned maintenance is prioritized by evaluating data... Would be impossible to use a ventilated-type transformer ` RZ '' APqeT @ C deserve... 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