Some transformer manufacturers recommend that the cable size be based on an ampacity level of 125% of nameplate rating. If any PECO Energy Employee Duke Energy trims trees to provide reliable service to our customers. Distribution poles are typically the smaller poles seen following roads or property lines through subdivisions and have connections directly to homes or businesses. The cables you install must be kept as far away as possible from coils and top blades. 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. 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 They gave us 6 logo ideas to start with. How often does Duke Energy trim or cut trees? Does Duke Energy manage vegetation that interferes with the light levels or pattern of light from streetlights and security lights? See my site logo at. ; 3 Then we will refine your Logo until you are 110 % satisfied! Why do you apply herbicides via helicopter? 2 0 obj They are useful in areas with a corrosive or dirty atmosphere. They have proactively gone above and beyond to do an exceptional job with everything. <> If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. 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). How do I request tree trimming or tree removal by Duke Energy? These cookies track visitors across websites and collect information to provide customized ads. 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. Clay soils are compressible and can cause problems that may require stabilizing back-fill. Duke Energy Florida Power & Light Gulf Power Company Oklahoma Gas & Electric Tampa Electric 6. [ILLUSTRATION FOR FIGURE 1 OMITTED]. If this does not happen, de-energize the transformer and contact the manufacturer. However, anyone is encouraged to report unsafe conditions. What is the time frame expected for the completion of customer-requested tree trimming? Structural support. The maximum continuous load a transformer can handle is indicated on its nameplate. If these parameters are different, circulation current will exist in the circuit loop between these units. 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. Selecting Transformer selection starts with the kVA rating required to supply the loads connected in the electrical system. 0 %%EOF You should consider this when planning the unit's installation. 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. This cookie is set by GDPR Cookie Consent plugin. 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. Develop a procedure for inventory of all tools, hardware, and any other objects used in the inspection, assembly, and testing of the transformer. Great service. You may also hire a company to remove the debris or contact your local public works to see if they remove yard debris. 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. hbbd```b``z"H-dfH`?dirdl"?$L@{b`Ig` / This website uses cookies to improve your experience while you navigate through the website. To simplify installation, you should request from the manufacturer a simplified outline drawing of the transformer. Is Duke Energy responsible for cleanup after trimming trees or weather events? Locating a unit at the end of a long, narrow room, or in the corner of a room can cause a megaphone effect and amplify the transformer's sound. For this test, apply a low-voltage (240V or 480V) to the high-voltage winding and measure the output at the low-voltage winding. Our Professional Package is designed for our small business, or just-starting-out business clients. 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. 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? Foundation preparation usually includes an evaluation of soil characteristics and concrete work. 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. more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) Who can request trimming or removal of a tree? When viewing transformer product literature, you'll probably find that one manufacturer's units will have differences from that of a competing manufacturer. endobj down from each of the ends of the long sides. 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. Serious injury or death may result from climbing a tree and making direct contact with or coming too close to an energized line. The difference is they contain an enclosed tank with nitrogen or other dielectric gas to protect the windings. Web10-Clearances o 10.06-01 Minimum Guy Clearances 11-Metering Many of the standards in the following subsections are applicable: o 11.01 Self-Contained Metering General o 11.09 Transformer-Rated Metering, Primary, Three-Phase o 11.11 Transformer-Rated Metering, Primary, Three-Phase - UG DEP UG Distribution Standards The magnitude of the voltages shown (line-to-ground and line-to-line) should be very similar. If our attempts to notify you are unsuccessful, work will proceed without further direct notification. 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. North America | April 5, 2018. hbbd```b``{"@$$)fO8,f`v/~, lb{ 6_DrGH 8Xqf$]v P(9Wl0 v 3 0 obj Your file is uploaded and ready to be published. There are different construction types for transformers used in commercial buildings. For pad mount transformers with ratings 75kVA through 500kVA, a typical concrete base would be 5 1/2 by 6 1/2 ft and 10 in. Air intake openings in the wall may be necessary or a larger minimum surrounding All rights reserved. The greater the differences in these parameters, the greater the magnitude of the circulating current. 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. You may lift transformers with enclosures having lifting lugs by using appropriate slings or chains. 2043 0 obj <> endobj An IVM program evaluates vegetation and determines the best methods for maintenance and tree removal to ensure reliable service. Our understanding of their general characteristics will allow the designer and end user to make the proper selection for the electrical system application. Therefore, compatible versus incompatible species are subject to removal through mowing. 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. Aerial maintenance applications can be completed much more quickly than manual spraying, reducing crew exposure to physical hazards in the right-of-way environment. In addition, there are other specific requirements based on the transformer type, such as weatherproof enclosures for dry-type transformers installed outdoors or a transformer vault room for oil-insulated transformers installed indoors. Exception: Meter socket and current While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. endobj What alternatives are there to remove wood after vegetation maintenance has occurred? 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. endstream endobj startxref This is especially true if bronze or other type material is used for the nuts/bolts. Jana Ganion, Sustainability and Government Affairs Director. Duke Energy contractors have been trained on the proper, safe and environmentally responsible techniques of managing plant growth. When speaking to consulting engineers on this topic, we've found that they recommend the cable be sized for the transformer's nameplate rating. The difference in impedance should not exceed 7.5%. The cookie is used to store the user consent for the cookies in the category "Performance". In some locations, Duke Energy may have an easement of varying widths. Are there any special circumstances that would cause Duke Energy to limit tree pruning to less than a specified distance on either side of the right of way centerline? Each test has a particular objective that helps determine a transformer's suitability for use. It is good practice to regularly test this type of transformer in order to determine dielectric breakdown, which affects its useful life. How it Works. I have recently used the services of CreateLogoDesign.com, and found their standard of skill and creativity to be exemplary. An article on how to choose a transformer based on the latter criteria appeared in the May '96 issue of EC&M. We have worked with various logo designers, and they are the cream of the crop. Great work! 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. ]]> It's recommended that all conducted tests comply with applicable ANSI/IEEE and NEMA standards. This type can be installed in areas with corrosive or dirty atmospheric conditions where it would be impossible to use a ventilated-type transformer. The transformer is equal to or less than its rated kVA and rated voltage. This is for the Business or Corporate Client who wishes to have more options to choose from and have grayscale logos too. Check all of the tap jumpers for proper location and for tightness. 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. 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. When specifying a transformer to be operated in parallel with existing units, all these parameters should be discussed with the transformer manufacturer. Duke Energy to invest $36B on power projects by 2026. How do I identify distribution and transmission structures? Performing this action will revert the following features to their default settings: Hooray! 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, ; 3 Then we will refine your Logo until you are 110 % satisfied! These cookies do not store any personal information. We believe it speaks for itself. 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. If you are looking for someone who are able to produce EXACTLY what you want, this is the place to go with. If in doubt about clearances, do not hesitate to call the transformer manufacturer. When is tree trimming considered an emergency? Duke Energy does not prune trees for light levels or pattern. Duke Energy Transmission procedure documents are the property of Duke Energy. 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. It's important that you have an understanding of the manufacturer's warranty. All products used by Duke Energy are registered by the Environmental Protection Agency and approved by appropriate state agencies. 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). 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). 78 0 obj <>stream We also use third-party cookies that help us analyze and understand how you use this website. 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. When the load-side voltage is low, tap connections below 100% of line voltage must be used to raise the load voltage. 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I request tree trimming or tree removal by Duke Energy to invest $ 36B on Power projects by.. Cables you install must be kept as duke energy transformer clearance requirements away as possible from and...
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