duke energy transformer clearance requirements

0 For this test, apply a low-voltage (240V or 480V) to the high-voltage winding and measure the output at the low-voltage winding. Selecting, sizing transformers for commercial buildings, By using this website, you agree to our use of cookies. 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. You may also hire a company to remove the debris or contact your local public works to see if they remove yard debris. Information on minimum wire bending space clearances at terminals for conductors is found in NEC Sec. Access to the Contractor Portal requires username and (If the power transformer has CT circuits, they should be closed.) You may lift transformers with enclosures having lifting lugs by using appropriate slings or chains. * Applied and induced potentials, which verify dielectric strength. However, they do protect the transformer itself from damage caused by harmonics. 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. 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. 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 more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) Some equipment could have a different torque requirement than shown. 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. A point of contact will be provided should you have questions or concerns about the upcoming vegetation work. 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. They can be installed where moisture or airborne contaminants exist. 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. Duke Energy trims trees to provide reliable service to our customers. We also use third-party cookies that help us analyze and understand how you use this website. This cookie is set by GDPR Cookie Consent plugin. With Duke Energys Builder Portal, you have the tools you need to get it done, right at your fingertips. 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. 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. However, for low-voltage (600V and below) transformers, this is not practical. Copyright www.CreateLogoDesign.com. Equipment operation characteristics will continue to change. Serious injuries and even fatalities have occurred when untrained individuals have done this work without the assistance of qualified professionals. 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. 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 %PDF-1.6 % If the structure is wooden and 30 to 40 feet tall with or without transformers attached, it is typically a distribution pole. 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. 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. We really liked two of them, and asked him to amalgamate them. 7. 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. Letterhead and 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. Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites Some principles to consider for transformer installation include locating them in isolated rooms with proper ventilation, clearances, and accessibility. Who can request trimming or removal of a tree? 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. 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. Lifting from the base frame may require the use of a spreader bar to avoid damage to the enclosure panels. 4 0 obj There should be no attempt to handle a transformer in any other position. North America | April 5, 2018. To provide reliable service, Duke Energy must prune or remove trees along the power lines. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. When planning the installation, you should select a location that complies with all safety codes yet does not interfere with the normal movement of personnel, equipment, and material. This website uses cookies to improve your experience while you navigate through the website. Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. The first set of logo ideas were terrific. 847 0 obj <>stream Duke Energy Florida Power & Light Gulf Power Company Oklahoma Gas & Electric Tampa Electric 6. Pruning trees around power lines should only be attempted by qualified professionals. When speaking to consulting engineers on this topic, we've found that they recommend the cable be sized for the transformer's nameplate rating. All windings should be checked for continuity. 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. A note of caution: The information presented here is not meant to supersede any manufacturer's instructions. n"fyuAf[vz}:L3h0vjB)ta=T5MFKV3!YyeQ.\A?|1a/9 yQQ1KR8N:@Q.LCmGwP72juW*QW_8"DyP3(\gjQ8qCZA{xGW*-EETOzk~h+,I`=p 3 If these parameters are different, circulation current will exist in the circuit loop between these units. What happens when trees come into contact with power lines? These cookies will be stored in your browser only with your consent. Why are you trimming or cutting down my trees? Check all of the tap jumpers for proper location and for tightness. After I submit activities, construction or landscaping plans, what type of authorization will I receive for the use of a Duke Energy easement? Serious injuries, and even fatalities, have occurred when unqualified individuals perform this type of work without the assistance of qualified professionals. 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. This may include personalization of content and ads, and traffic analytics. Dry-type transformers have sound levels that are somewhat Some transformer manufacturers recommend that the cable size be based on an ampacity level of 125% of nameplate rating. WebHow it Works. ; 3 Then we will refine your Logo until you are 110 % satisfied! Otherwise, they can be installed on open walls or steel columns or above suspended ceilings. The secondary is 3-phase, 4-wire or Wye connected. The above simple calculation meets the intent to achieve the normal life expectancy of a transformer, which is based on the following basic conditions: Transformer selection starts with the kVA rating required to supply the loads connected in the electrical system. Compatible species are not targeted for herbicide application. hkO0ibv*JmG[$ Are you sure you want to delete your template? The majority of our pruning and cutting occurs during planned maintenance. Thanks! The tap setting should also be verified for the proper voltage. Clearance Rules for Distribution , 4 of 10 Clearance Rules for Distribution ; Clearance Rules for Distribution , 5 of 10 Clearance Rules for Distribution ; Clearance Requirements, 6 of 10 In some locations, Duke Energy may have an easement of varying widths. You can have big-business results at a "business-on-a-budget" price! Watch Jana's Story. ]]> They have proactively gone above and beyond to do an exceptional job with everything. WebAustin Enclosures AB-243212CT/DP1G Duke Power CT Cabinet Austin rainproof boxes are for Wiring or Junction box applications. endstream endobj 2044 0 obj <>>>/Pages 2032 0 R/StructTreeRoot 707 0 R/Type/Catalog>> endobj 2045 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 2046 0 obj <>stream These terminations should be attached to the cables as specified by the termination or cable manufacturer. Will I be notified before a tree crew comes to cut trees in my yard? Necessary cookies are absolutely essential for the website to function properly. Also, with this information, it will be easier to plan site arrangements. No one should climb trees that are in the vicinity of power lines. Click Here to see our Portfolio. Business Card, Yes, there are special circumstances that may include: (1) the proper ANSI cut is not a specified distance from the centerline, (2) the trunk of a mature tree is established within rights of way, (3) the tree is inhabited by an endangered species, (4) the tree is a slow-growing species or (5) there is a Department of Transportation encroachment. These periodic mechanical movements create sound vibrations with a fundamental frequency of 120 Hz and harmonics derivatives of this fundamental. Adequate surrounding air space must be maintained for the required transformer "heat loss" ventilation. 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. Non-ventilated Transformers should be a minimum of 3 inches from any obstruction on all sides and top. The foundation should be constructed of reinforced, air entrained concrete having at least 3000 psi compressive strength at 28 days after pouring. It is obvious that CreateLogoDesign takes great pride in their work and rightly so. Before energizing a 3-phase transformer, you should arrange to monitor the voltages and currents on the low-voltage side. stream When a Customer does his own wiring, he will be considered the electrical contractor for the purpose of these requirements. You also have the option to opt-out of these cookies. 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. endstream endobj startxref ;w]S9 V?O|H?&V+f[^ c#7b0#M>*. 450-10 and check the grounding of the neutral as applicable per NEC. 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. What fantastic professionals to work with. Following are some of the transformer types available in the industry along with a few of their characteristics: Ventilated dry-type transformers are ventilated by air, use larger space for clearance, and use different insulating materials to augment the dielectric strength of the air. Transformers change voltage levels to supply electrical loads with the voltages they require. Both the voltages and currents should change in a similar fashion. 1 0 obj We will definitely work with them in the future, and recommend them to anyone who is serious about having quality work done for business. Transmission easement documents can be located in their respective countys deeds and records department. 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. It shall be the customers 7. Duke Energy to invest $36B on power projects by 2026. September 14, 2022. thick with chamfered edges on top of the base and footings extending 20 in. Correct fan rotation should be visually verified as well as by checking indicator lights if they are installed. Transformers are located either outdoors or inside buildings in an electrical room or other areas as permitted by code. 52 0 obj <> endobj 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. %PDF-1.5 % Learn about the current state of the retail & distribution industry, and developments in technology. endobj the local authority having jurisdiction (ahj) may have requirements that are more stringent. If this isn't possible, you first should contact the manufacturer to explore other options. 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. These cookies ensure basic functionalities and security features of the website, anonymously. 2043 0 obj <> endobj We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. This rating provides the associated power output delivered for a specific period by the loads connected to the transformer on the secondary side of the equipment. What is the time frame expected for the completion of customer-requested tree trimming? Transformers are usually designed and built to provide good electrical connections using either copper or aluminum cable. Great service. The weight distribution should be studied by examining the inside of the transformer enclosure for dry-type units. This article presents several useful design concepts for selecting and sizing transformers in the design of electrical systems for commercial buildings. Units lifted from the top core clamps will sometimes require that the top cover or part of the cover be removed. All Rights Reserved. Then, without connecting the load, energize the transformer. Our interactions and communication throughout our project were flawless. % When specifying a transformer to be operated in parallel with existing units, all these parameters should be discussed with the transformer manufacturer. Here, a transformer turns ratio indicator should be used to measure the ratio. The insulation resistance test should be conducted immediately prior to energizing the transformer or the beginning of the dielectric test. When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. They typically have primary voltages higher than 600 V and secondary voltages lower than 600 V with compartments for the associated protective devices assembled in an integral tamper-resistant and weatherproof unit. If trees or limbs have fallen onto power lines, we will dispatch crews to clear the vegetation from power lines and equipment. 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. Use of alternate means of fire protection must be approved by the local code enforcement authority. We believe it speaks for itself. We will most definitely return should we have additional needs!! 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. Never attempt to check the output voltage at the transformer. 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. For a limited time we are offering our logo design services for $29 only. Web(2) Subsurface horizontal transformer (see Table 5 and Table 6 on Page 6). We do UNLIMITED REVISIONS until you are 110% satisfied with your logo. 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. Well remember your selection for future visits. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". gz&E6;ZdEv;z~gx Till date we have designed more than 5,000 business logos. Large enclosed units with base frame type enclosures may be jacked using the base frame angles. They have clearly demonstrated their understanding of design while also meeting our needs. An easement is typically granted by property owners to an electric utility for the purpose of constructing and maintaining power lines and other equipment. We understand how critical a logo is to the success of your business. 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. 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. You also have the option to opt-out of these cookies. Energy Efficient Transformer require a minimum of 3`` clearance from ventilated openings. Note that for MV transformers, the secondary neutral is sometimes grounded through an impedance. You should consider this when planning the unit's installation. They are very professional, and the team knows their craft. For units with ratings above 500kVA to 2500kVA, a typical concrete base would be 8 ft by 9 ft and 10 in. %PDF-1.7 % Oil-filled transformers are constructed with the windings encased in an oil-tight tank filled with insulating mineral oil. The cookie is used to store the user consent for the cookies in the category "Analytics". These provisions will vary depending upon the weight, size, and mechanical configuration of the unit. Although there are no moving parts in a transformer, the core does generate sound. Where their use is required, 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. %PDF-1.5 If our attempts to notify you are unsuccessful, work will proceed without further direct notification. Nonventilated dry-type transformers are similar to the ventilated type but are totally enclosed. It's the responsibility of the property owner to maintain the growth of any trees interfering with the lighting pattern. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> The transformer is equal to or less than its rated kVA and rated voltage. If you cannot gradually increase the load, then full load may be applied. To get your Company Logo developed by our experienced Logo Designers, please fill out our Order Form. Regardless of manufacturer, you should carefully follow these instructions to ensure adequate safety to personnel and equipment. This material will provide additional general guidelines for installing and testing both dry-type and liquid-filled transformers for placement into service. Our goal is to provide professional logo design at an affordable price. It's recommended that all conducted tests comply with applicable ANSI/IEEE and NEMA standards.