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. WebAustin Enclosures AB-243212CT/DP1G Duke Power CT Cabinet Austin rainproof boxes are for Wiring or Junction box applications. 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? 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. Duke Energy trims trees to provide reliable service to our customers. WebIntroduction, 1 of 7 Introduction. How often does Duke Energy trim or cut trees? When changing taps, the same changes must be made for all phases. These cookies will be stored in your browser only with your consent. We do not round trees over because it contributes to poor tree health. down from each of the ends of the long sides. hbbd``b` $f F3 H0i .`RZ"APqeT @ C! {& There are different construction types for transformers used in commercial buildings. Re-tighten all cable retaining bolts after the first 30 days of 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). You should arrange for an insulation resistance test to be carried out to make certain that no windings are grounded. Duke Energy Transmission procedure documents are the property of Duke Energy. The weight distribution should be studied by examining the inside of the transformer enclosure for dry-type units. 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. hb```7,^ cb'60H6wZ $(|`n`h`` ``{_j j[e13b{@38O=)HpG17hCDC i. hToSU}W`lq;!%Ya82/>Z%&t-v @4Fi)<4Q#`xn\ H h `eXZ[5baH889j UpuUdb1eFl*]F~`[_(`ul)iYJ:Jg@CzgrD6Dr-'vv(J2wfjA!fn+ZFg,y@)sqUXhgl{/5=9pn*-XGpcNZOZW,V2gTq,g W@01!86)mA3T$+'vrLA{0Q5 /Z5T* `=|pi})q\HO N|QjmGM1efL>kf(LXJ&|k\{11}7{C7zox>/n7E3p:? Some equipment could have a different torque requirement than shown. This was our second project and I knew exactly who I wanted to work with. After I submit activities, construction or landscaping plans, what type of authorization will I receive for the use of a Duke Energy easement? Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. Foundations. Cast-coil transformers are constructed with the primary and secondary windings encapsulated in reinforced resin. I was so impressed with the finished result that I've asked them to undertake future work. WebRequirements 1) It shall be the contractor's responsibility to secure the Power Company's approval prior to applying for a permit. Watch Jana's Story. This article will continue in subsequent issues of EC&M. Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. 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. Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites I have received many compliments on the work which has been undertaken thus far and have no hesitation in recommending CreateLogoDesign.com to friends and colleagues and will continue to do so. 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). Lifting from the base frame may require the use of a spreader bar to avoid damage to the enclosure panels. Any control circuits, if any, should be checked to make sure they function correctly. 2023 Endeavor Business Media, LLC. Nonventilated dry-type transformers are similar to the ventilated type but are totally enclosed. Dry-type transformers have sound levels that are somewhat Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. Regardless of manufacturer, you should carefully follow these instructions to ensure adequate safety to personnel and equipment. Reproduction, ;w]S9 V?O|H?&V+f[^ c#7b0#M>*. They supply the required incoming electrical service to the buildings. 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. K-rated transformers do not mitigate or eliminate harmonics. Develop a procedure for inventory of all tools, hardware, and any other objects used in the inspection, assembly, and testing of the transformer. 3 0 obj However, for low-voltage (600V and below) transformers, this is not practical. We really liked two of them, and asked him to amalgamate them. 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. Analytical cookies are used to understand how visitors interact with the website. Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. A note of caution: The information presented here is not meant to supersede any manufacturer's instructions. Great work! Baeza is a principal and senior electrical engineer at TLC Engineering for Architecture in Miami. Where can recorded transmission easement documents be found? 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 Large enclosed units with base frame type enclosures may be jacked using the base frame angles. Our site is customized based on your location. For units with ratings above 500kVA to 2500kVA, a typical concrete base would be 8 ft by 9 ft and 10 in. Are you sure you want to delete your template? The same adjustment should be made to compensate for voltage drop in the output due to long cable runs. 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. 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. Createlogodesign were fantastic. 300.2 METERED AND UNMETERED CONDUCTORS . However, a specially designed unit may have specific load capabilities not indicated on the nameplate. 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. >> We employ lateral and directional pruning methods endorsed by tree care professionals. ; 4 Final files will be provided in any format. For example, trees can grow into the electrical equipment or fall across power lines, causing outages. These procedures are different than rounding of trees over in which limbs are cut at arbitrary points, normally leaving unhealthy stub cuts. Performing this action will revert the following features to their default settings: Hooray! However, their operating principles will remain with the same. Although there are no moving parts in a transformer, the core does generate sound. Roles and Responsibilities Associated with Clearances, 1 of 8 Both projects included dry-type 480 V, 3-phase to 208 Y/120V V step-down transformers (in NEMA 2 enclosures), ranging from 15 kVA to 112.5 kVA in the electrical system distribution design. To simplify installation, you should request from the manufacturer a simplified outline drawing of the transformer. 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. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr However, they do protect the transformer itself from damage caused by harmonics. Create Logo Design offers professional and custom logo design services. 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. ; 3 Then we will refine your Logo until you are 110 % satisfied! Selecting, sizing transformers for commercial buildings, By using this website, you agree to our use of cookies. September 14, 2022. If this does not happen, de-energize the transformer and contact the manufacturer. On-site health department permit shall be in place at this time. Adequate surrounding air space must be maintained for the required transformer "heat loss" ventilation. We offer a truly unbelievable service for the price to help you get a great start or revamp your business. 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). To get your Company Logo developed by our experienced Logo Designers, please fill out our Order Form. When your transformer arrives on site, various procedures should be carried out to assure successful operation. The format of the written authorization will depend upon the specific requested use of a Duke Energy right of way. You take your choice; extra safety and extra cost or regular-sized cables. The ESR Manual provides guidance and instructions pertaining to electrical service connections. This does not apply to bottom ventilation openings. 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. We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. 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. The 18,688-seat FIU football stadium was designed with about 12 transformers as part of the electrical system distribution in order to supply general-use receptacles, small motors, and other loads in the stadium building structure and the attached field house building. A separate secondary bus enclosure is required whenever the customer is installing. What types of trees and/or plants may be planted near pad-mounted transformers and power lines, and what do I need to consider prior to planting? You should consider contributing to our CFE Media editorial team and getting the recognition you and your company deserve. Here, a transformer turns ratio indicator should be used to measure the ratio. 0 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. hkO0ibv*JmG[$ 52 0 obj <> endobj 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. We also use third-party cookies that help us analyze and understand how you use this website. 450-10 and check the grounding of the neutral as applicable per NEC. Transformers should be maintained in an upright position when being moved. Oil-filled transformers are constructed with the windings encased in an oil-tight tank filled with insulating mineral oil. The harmonics resulting from nonsinusoidal currents generate additional losses and heating of the transformer coils, which reduce the transformer life expectancy. %%EOF These cookies do not store any personal information. All rights reserved. Who should trim or cut trees around power lines? Part 2 will address installation procedures for dry- and wet-type transformers, the latter being fully assembled. Air intake openings in the wall may be necessary or a larger minimum surrounding Member Resources. With the exception of emergency situations, we attempt to ask permission of the property owner before taking down trees in maintained or landscaped areas. more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) 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 Who can request trimming or removal of a tree? When people identify downed lines or trees touching power lines and act wisely, it minimizes the risk from trees contacting power lines. The installation of conductors should be performed only by personnel qualified and experienced in high-voltage equipment. What can I do in a transmission right of way? [CDATA[// >