Non-ventilated Transformers should be a minimum of 3 inches from any obstruction on all sides and top. The location of a transformer relates directly to how noticeable its sound level appears. Great work! This does not apply to bottom ventilation openings. This may include personalization of content and ads, and traffic analytics. If you have some doubt as to the load capability of the unit, contact the manufacturer. If our attempts to notify you are unsuccessful, work will proceed without further direct notification. WebIntroduction, 1 of 7 Introduction. 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. You should note, though, that transformers serving large harmonic loads can produce a higher audible noise. All Rights Reserved. Transformers change voltage levels to supply electrical loads with the voltages they require. Duke Energy to invest $36B on power projects by 2026. Necessary cookies are absolutely essential for the website to function properly. But opting out of some of these cookies may affect your browsing experience. document.getElementById('copyright').innerHTML = new Date().getFullYear(); Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. 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). 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. Correct fan rotation should be visually verified as well as by checking indicator lights if they are installed. WebPer 450.27 of the NEC; Combustible material, combustible buildings, and parts of buildings, fire escapes, and door and window openings shall be safeguarded from fires originating in oil-insulated transformers installed on roofs, attached to or adjacent to a building or combustible material. 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. And, each manufacturer will have its own instructions for installing and testing its transformers. Are there transmission right-of-way uses that are prohibited? We will definitely work with them in the future, and recommend them to anyone who is serious about having quality work done for business. endobj We understand how critical a logo is to the success of your business. A note of caution: The information presented here is not meant to supersede any manufacturer's instructions. You will not be disappointed, i promise. 450-12 on Terminal Wiring Space. Before working on the connections make sure all safety precautions have been taken. There are instances when a tree must be trimmed or removed outside of planned maintenance. Newer Energy Efficient (EX Type) require .5" from rear and sides to any obstruction. 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. Usually, lateral bracing and/or an extra solid anchorage will be required. Structural support. Your file is uploaded and ready to be published. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k, `h`` ``{_j j[e13b{@38O=)HpG17hCDC i. Preliminary inspection upon receipt of transformer. If this is not the case, deenergize the transformer and contact the manufacturer before proceeding further. 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. Where their use is required, Duke Energy Carolinas Distribution Construction Standards Reference Guide The Duke Energy Carolinas Distribution Construction Standards consist of the following documents available on 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). 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 This cookie is set by GDPR Cookie Consent plugin. You CANNOT go wrong by choosing them! Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites The development was easy because Steffi provided unlimited revisions, so we went through a series of small changes until we got a final. Representative torque requirements for making connections using steel nuts/bolts are shown in Table 1, on page 42. An article on how to choose a transformer based on the latter criteria appeared in the May '96 issue of EC&M. The weight distribution should be studied by examining the inside of the transformer enclosure for dry-type units. Box of 1 Unit Trade Account Log In Log In to view price Specifications Products specifications 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. Trees are assessed on a case-by-case basis. Larger units will have provisions for lifting from the base frame or from clamps at the top of the core. They were great at following our directions to the letter, while adding their own creative flair. The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment. Ensure that all grounding or bonding systems meet NEC and local codes. In the past two years, two large projects in Miami Dade County have been built: the Florida International University football stadium and Miami International Airport South Terminal. Structurally speaking, it's generally wiser to place a transformer as close as possible to a column. It shall be the customers The transformer is equal to or less than its rated kVA and rated voltage. 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. We offer a truly unbelievable service for the price to help you get a great start or revamp your business. n"fyuAf[vz}:L3h0vjB)ta=T5MFKV3!YyeQ.\A?|1a/9 yQQ1KR8N:@Q.LCmGwP72juW*QW_8"DyP3(\gjQ8qCZA{xGW*-EETOzk~h+,I`=p 3 Another consideration for indoor distribution transformers is the type of load: linear or nonlinear. Re-tighten all cable retaining bolts after the first 30 days of service. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". For example, trees can grow into the electrical equipment or fall across power lines, causing outages. Business Card, It's recommended that all conducted tests comply with applicable ANSI/IEEE and NEMA standards. We also use third-party cookies that help us analyze and understand how you use this website. 4 0 obj All products used by Duke Energy are registered by the Environmental Protection Agency and approved by appropriate state agencies. hbbd``b` $f F3 H0i .`RZ"APqeT @ C! {& And its important that you follow current NEC practice and applicable local codes. Webrequirements. They have proactively gone above and beyond to do an exceptional job with everything. Access to the Contractor Portal requires username and Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. The majority of our pruning and cutting occurs during planned maintenance. When your transformer arrives on site, various procedures should be carried out to assure successful operation. 2067 0 obj <>/Filter/FlateDecode/ID[<40F8DD91F560784FAE35A61D83A94C90>]/Index[2043 102]/Info 2042 0 R/Length 116/Prev 852971/Root 2044 0 R/Size 2145/Type/XRef/W[1 3 1]>>stream Aerial maintenance applications can be completed much more quickly than manual spraying, reducing crew exposure to physical hazards in the right-of-way environment. We use professional contractors to apply herbicide by utilizing different methods including foliar, stump, stem and vine applications. The ESR Manual provides guidance and instructions pertaining to electrical service connections. Serious injuries, and even fatalities, have occurred when unqualified individuals perform this type of work without the assistance of qualified professionals. Next, connect the load and energize the transformer. ; 2 Unlimited revisions. After installation, you should check the output voltage of the transformer. 837 0 obj <>/Filter/FlateDecode/ID[<628CD90D08ABAB4FB038EF4B9C9C7E56>]/Index[820 28]/Info 819 0 R/Length 84/Prev 192869/Root 821 0 R/Size 848/Type/XRef/W[1 2 1]>>stream fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr 3-Phase Padmount Transformer Concrete Foundation - Duke Energy. Well remember your selection for future visits. 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. YUMPU automatically turns print PDFs into web optimized ePapers that Google loves. Dry-type transformers have sound levels that are somewhat Also, when aluminum conductors are used, give them a protective compound treatment at the terminal as specified by the cable manufacturer. Linear loads include resistive heating and induction motors; nonlinear loads are produced by electronic equipment that contributes to the distortion of the electrical power signals by generating harmonics. If this does not happen, de-energize the transformer and contact the manufacturer. Regardless of manufacturer, you should carefully follow these instructions to ensure adequate safety to personnel and equipment. Transformers are usually designed and built to provide good electrical connections using either copper or aluminum cable. However if you are not satisfied, we refund the entire amount you paid us - no questions asked. When viewing transformer product literature, you'll probably find that one manufacturer's units will have differences from that of a competing manufacturer. To simplify installation, you should request from the manufacturer a simplified outline drawing of the transformer. 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. This category only includes cookies that ensures basic functionalities and security features of the website. 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. Member Resources. Duke Energy trims trees to provide reliable service to our customers. A point of contact will be provided should you have questions or concerns about the upcoming vegetation work. Line side (unmetered) and load side (metered) conductors shall not occupy the same raceway or enclosure. See Table 1 for typical dry-type transformer ratings, dimensions, and weights. Some transformer manufacturers recommend that the cable size be based on an ampacity level of 125% of nameplate rating. The usual sound levels for liquid-filled transformers range from 40 dB to 60 dB for units below 500kVA, about 65 dB for units between 4000kVA to 5000kVA, 73 dB for transformers with ratings between 6000kVA to 7500kVA, and 76 dB for units between 8000kVA and 10,000kVA. *. So confident am I in their workmanship and design skills that I will be coming back - and I am delighted with the results. driveways clearance with limited building heights Public roads and commercial driveways (except State Highways and Interstates Railroad electrified) * Supply service drops Electric Service. 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. hkO0ibv*JmG[$ <> 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. 1&Ub64#C #") "7KWpzJz1YeHB.r32Az{`gC~;jiV[Ceb*1rAz96lnA|3$ Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These terminations should be attached to the cables as specified by the termination or cable manufacturer. Some principles to consider for transformer installation include locating them in isolated rooms with proper ventilation, clearances, and accessibility. However, they do protect the transformer itself from damage caused by harmonics. %%EOF When an act of God (such as lightning, ice storms, high winds, hurricanes, tornadoes) or other natural events cause trees or other vegetation to fall across power lines and damage facilities, we cut the trees and brush so poles and lines can be replaced and re-energized. more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) Duke Energy uses environmentally responsible herbicide applications to control tall-growing incompatible plants within power line rights of way. 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. A protective plating or compound that prevents surface oxidation on the aluminum terminals is usually applied at the factory. The cookie is used to store the user consent for the cookies in the category "Analytics". %PDF-1.6 % Once the transformer has been located on its permanent site, a thorough final inspection should be made before any assembly is accomplished and the unit is energized. 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 Some applications require a reduced sound level, such as a large unit in a commercial building with people working close to it. If these parameters are different, circulation current will exist in the circuit loop between these units. The tap setting should also be verified for the proper voltage. Thanks! Air intake openings in the wall may be necessary or a larger minimum surrounding You also have the option to opt-out of these cookies. Pruning trees around power lines should only be attempted by qualified professionals. stream https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. The greater the differences in these parameters, the greater the magnitude of the circulating current. 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. We also use third-party cookies that help us analyze and understand how you use this website. Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. Never attempt to check the output voltage at the transformer. The cookie is used to store the user consent for the cookies in the category "Other. Oil-filled transformers are constructed with the windings encased in an oil-tight tank filled with insulating mineral oil. Planned maintenance is prioritized by evaluating reliability data, field conditions and other specific information. Otherwise, they can be installed on open walls or steel columns or above suspended ceilings. 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). However, anyone is encouraged to report unsafe conditions. All Rights Reserved. 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. 0 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. The electrical phase characteristics associated with the transformers primary side is 3-phase, 3-wire or Delta connected. If you cannot gradually increase the load, then full load may be applied. <>>> 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. 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. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr 9. clearances listed are duke energy minimum requirements. Our understanding of their general characteristics will allow the designer and end user to make the proper selection for the electrical system application. There are instances when a tree must be trimmed or removed without prior notification. Note that for MV transformers, the secondary neutral is sometimes grounded through an impedance. Transformers are located either outdoors or inside buildings in an electrical room or other areas as permitted by code. The revisions were done quickly and to my specifications, and often I was provided multiple versions from which to select. What alternatives are there to remove wood after vegetation maintenance has occurred? The expense associated with testing represents a larger portion of a small transformer's cost compared with the testing cost of a large kVA unit. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Your Satisfaction is Guaranteed! 7. Sometimes, when testing is carried out at the manufacturer's plant, the manufacturer will also allow a purchaser or a representative, such as a consulting engineer, to witness the tests. Adequate surrounding air space must be maintained for the required transformer "heat loss" ventilation. 1 0 obj hToSU}W`lq;!%Ya82/>Z%&t-v @4Fi)<4Q#`xn\ H h `eXZ[5baH889j UpuUdb1eFl*]F~`[_(`ul)iYJ:Jg@CzgrD6Dr-'vv(J2wfjA!fn+ZFg,y@)sqUXhgl{/5=9pn*-XGpcNZOZW,V2gTq,g W@01!86)mA3T$+'vrLA{0Q5 /Z5T* `=|pi})q\HO N|QjmGM1efL>kf(LXJ&|k\{11}7{C7zox>/n7E3p:? WebAustin Enclosures AB-243212CT/DP1G Duke Power CT Cabinet Austin rainproof boxes are for Wiring or Junction box applications. 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. Transformers that are not over 600 V and are part of the indoor building electrical system distribution have both primary and secondary voltages below 600 V with the most common voltage level change from 480 V to 208 Y/120 V. Pad-mounted transformers are installed outside and are considered the first option for supplying service entrance voltage to the building electrical system based on the project size and requirements. If this isn't possible, you first should contact the manufacturer to explore other options. 78 0 obj <>stream These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. K-rated transformers do not mitigate or eliminate harmonics. Transformer primary and secondary voltages can be 2,400; 4,160; 7,200; 12,470; and 13,200 for 15-kV Class, and 120, 208, 240, 277, and 480 for 600-V Class. If you see a fallen tree in contact with a power line, immediately contact Duke Energy. We are well pleased to work with createlogodesign. You should ground the transformer as per NEC Sec. If appropriate, supports should be used so that the transformer enclosure is not crushed when the unit is lifted. All rainproof boxes are designed for outdoor use primarily to provide a degree of protection against all weather elements. 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. Our site is customized based on your location. //-->+30mg`T}n303c2bpa4%u`(00m] 9>b`28 *> If any PECO Energy Employee Call, For additional information please visit our. When speaking to consulting engineers on this topic, we've found that they recommend the cable be sized for the transformer's nameplate rating. ]]> As appropriate, you should make arrangements to adequately support the incoming/outgoing connecting cables to ensure that there is no mechanical stress imposed on transformer bushings and connections. The difference is they contain an enclosed tank with nitrogen or other dielectric gas to protect the windings. Compatible species are not targeted for herbicide application. [CDATA[// >