Blue Lake Rancheria. Structurally speaking, it's generally wiser to place a transformer as close as possible to a column. Great service. We offer a truly unbelievable service for the price to help you get a great start or revamp your business. more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) After I submit activities, construction or landscaping plans, what type of authorization will I receive for the use of a Duke Energy easement? Although there are no moving parts in a transformer, the core does generate sound. 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. But be careful here: Before applying this voltage, check with the manufacturer's manuals. 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. We use professional contractors to apply herbicide by utilizing different methods including foliar, stump, stem and vine applications. 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. Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. Your file is uploaded and ready to be published. 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. 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. 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 Otherwise, they can be installed on open walls or steel columns or above suspended ceilings. 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. If these parameters are different, circulation current will exist in the circuit loop between these units. % We offer a 100% Satisfaction Guarantee. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr Analytical cookies are used to understand how visitors interact with the website. Performing this action will revert the following features to their default settings: Hooray! You will find it beneficial to carry out this testing for future comparative purposes, and also for determining the suitability of the transformer for energizing or application of a high potential test. If you have some doubt as to the load capability of the unit, contact the manufacturer. This article presents several useful design concepts for selecting and sizing transformers in the design of electrical systems for commercial buildings. The cookie is used to store the user consent for the cookies in the category "Other. "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} We also use third-party cookies that help us analyze and understand how you use this website. There should be no attempt to handle a transformer in any other position. They can be installed outdoors or indoors. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} USA, North Carolina: U.S. electricity company Duke Energy announced it has allocated investments of $25 billion to be spent on grid modernization and $11 billion for expanding renewable and natural gas-fired power generation over 2017 to 2026. We also use third-party cookies that help us analyze and understand how you use this website. %%EOF I have found the after sales service to be as professional as the original work, nothing being too much trouble to ensure that the customer is completely satisfied. Duke Energy Transmission procedure documents are the property of Duke Energy. 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. 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 Also, you should arrange for a one-minute, 1200V insulation resistance test of the control circuits. Our logos are stylish, unique and memorable. 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. 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. Box of 1 Unit Trade Account Log In Log In to view price Specifications Products specifications We will most definitely return should we have additional needs!! Nonventilated dry-type transformers are similar to the ventilated type but are totally enclosed. %%EOF See Table 1 for typical dry-type transformer ratings, dimensions, and weights. Both the voltages and currents should change in a similar fashion. There are NEMA standards for transformer sound and depending upon the kVA rating of a unit, the sound it produces must be under a certain decibel level. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k. Part 2 will address installation procedures for dry- and wet-type transformers, the latter being fully assembled. Some applications require a reduced sound level, such as a large unit in a commercial building with people working close to it. 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. If any PECO Energy Employee Before a power line is built, Duke Energy acquires easements from property owners along the selected route. n"fyuAf[vz}:L3h0vjB)ta=T5MFKV3!YyeQ.\A?|1a/9 yQQ1KR8N:@Q.LCmGwP72juW*QW_8"DyP3(\gjQ8qCZA{xGW*-EETOzk~h+,I`=p 3 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. (Most of the information in these standards also can be applied to liquid-filled transformers.). What is the time frame expected for the completion of customer-requested tree trimming? 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). 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 loads, which are calculated as part of the building electrical system design phase, are shown in the construction documents respective equipment schedules in VA or kVA. Units lifted from the top core clamps will sometimes require that the top cover or part of the cover be removed. 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. A point of contact will be provided should you have questions or concerns about the upcoming vegetation work. What fantastic professionals to work with. 373-6, Deflection of Conductors, and referenced in Sec. Develop a procedure for inventory of all tools, hardware, and any other objects used in the inspection, assembly, and testing of the transformer. Serious injuries and even fatalities have occurred when untrained individuals have done this work without the assistance of qualified professionals. In some locations, Duke Energy may have an easement of varying widths. 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. 71 0 obj <>/Filter/FlateDecode/ID[<17271311DD281D44B60DE10DB84FA7A1>]/Index[52 27]/Info 51 0 R/Length 98/Prev 491904/Root 53 0 R/Size 79/Type/XRef/W[1 3 1]>>stream The transformer should be jacked evenly on all four corners to prevent warping or tipping over. Foundations. Serious injuries and even fatalities have occurred when 7. 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). 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. WebAustin Enclosures AB-243212CT/DP1G Duke Power CT Cabinet Austin rainproof boxes are for Wiring or Junction box applications. endstream endobj startxref 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. Our site is customized based on your location. Non-ventilated Transformers should be a minimum of 3 inches from any obstruction on all sides and top. Correct fan rotation should be visually verified as well as by checking indicator lights if they are installed. h[oWcp :\_H84$p~U==$W9A{fzQ!wZkzjgybveni\+\-\z&w:%HE*:Er;cWc 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. Structural support. The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment. It shall be the customers Dry-type transformers have sound levels that are somewhat higher. Trees can disrupt power in a number of ways. 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. 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. If you cannot gradually increase the load, then full load may be applied. Why do you apply herbicides via helicopter? 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. Consult the transformer diagrammatic nameplate for information on what tap must be used to correct for extra high or extra low incoming line voltage. The insulation resistance test should be conducted immediately prior to energizing the transformer or the beginning of the dielectric test. In maintained or landscape settings, our policy is to dispose of any small limbs and brush. Sealed dry-type transformers are similar to dry type in most of their characteristics. B. Three-Phase: The standard transformer for three-phase service is Style MTP, Style IIE-LB, or Style IIG pad-mount transformer (see Table 12 through Table 19 on Pages 8 through 10). We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. 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. In the presence of a magnetic field, the core laminations elongate and contract. This category only includes cookies that ensures basic functionalities and security features of the website. 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duke energy transformer clearance requirements