duke energy transformer clearance requirements

Then, without connecting the load, energize the transformer. The electrical size of the transformer load is rated in kVA. 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. %%EOF Tree placement in relation to overhead power lines is critical in order to preserve the natural size, shape and overall integrity of the tree and protect the intent for which it was planted. Create Logo Design offers professional and custom logo design services. Planned maintenance is prioritized by evaluating reliability data, field conditions and other specific information. For transformers placed outside that are 2000kVA and above, you may wish to have the soil examined. Click Here to see our Portfolio. When is tree trimming considered an emergency? endobj ; 2 Unlimited revisions. How do I request tree trimming or tree removal by Duke Energy? As prescribed by NEMA standards, transformers are shipped with both high and low-voltage windings connected to their highest rated voltage (except transformers that have taps above the rated voltage, in which case they will be shipped connected for rated voltage). Exception: Meter socket and current //-->>>/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 When viewing transformer product literature, you'll probably find that one manufacturer's units will have differences from that of a competing manufacturer. After installation, you should check the output voltage of the transformer. 0 These practices are approved by internationally recognized tree care associations and are referred to as Integrated Vegetation Management (IVM). There are different construction types for transformers used in commercial buildings. Are there transmission right-of-way uses that are prohibited? This does not apply to bottom ventilation openings. Trees are assessed on a case-by-case basis. The tap setting should also be verified for the proper voltage. When transformers are installed for parallel operation, their rated voltages, impedances, and turn ratios ideally should be the same and their phasor relationships identical. Do you have experience and expertise with the topics mentioned in this content? These terminations should be attached to the cables as specified by the termination or cable manufacturer. %PDF-1.5 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. They can be installed outdoors or indoors. endobj 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). Transmission Systems . Revision 009 Effective Date 02/18/2022 . When a Customer does his own wiring, he will be considered the electrical contractor for the purpose of these requirements. Occasionally, the installation of some method of sound abatement will be called for. 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. 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. 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. 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 finish on the logo was outstanding, and consequently we are looking to work with them on future projects. Our logos are specifically created respecting the individuality of your company. If you have some doubt as to the load capability of the unit, contact the manufacturer. Where can recorded transmission easement documents be found? Selecting, sizing transformers for commercial buildings, By using this website, you agree to our use of cookies. Line side (unmetered) and load side (metered) conductors shall not occupy the same raceway or enclosure. If the structure is wooden and 30 to 40 feet tall with or without transformers attached, it is typically a distribution pole. Re-tighten all cable retaining bolts after the first 30 days of service. 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). Two good references to dry-type transformer requirements are ANSI/IEEE C57.12.01-1989, IEEE Standard General Requirements for Dry-Type Distribution and Power Transformers Including Those With Solid Cast and/or Resin-Encapsulated Windings, which addresses general requirements, and C57.12.91-1995, IEEE Test Code for Dry-Type Distribution and Power Transformers, which addresses testing. Southern California Edison, Disclosure of Non-Public Transmission Function Information, SCE Affiliates that Employ or Retain Marketing Function Employees, Job Titles and Description of SCE's Transmission Function Employees, Voluntary Consent to Share Non-Public Transmission Customer Information, Discretion Exercised Under Terms of Tariff, Discounts Offered For Transmission Service, Santa Catalina Island Gas & Water Tariffs, Santa Catalina Island Gas & Water Filed Forms, Notice of Release of Customer Information to Affiliates, Supply / Capacity / Services / Info Offered to Affiliates, Non-Customer Specific, Non-Public Information Offered to Affiliates, Annual Low Income Energy Efficiency Reports, 2009-11 Local Government Partnership Abstract Responses, Transmission Maintenance and Compliance Review (TMCR), Methodology of Creating the Static Load Profiles, SCE Offers Fixed-Price Amendment to Renewable Projects, Electrical Service Requirements (ESR - PDF), Regulatory Information - SCE Distribution Manuals. 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. Some transformer manufacturers recommend that the cable size be based on an ampacity level of 125% of nameplate rating. Till date we have designed more than 5,000 business logos. However, for low-voltage (600V and below) transformers, this is not practical. In addition, the size of the commercial facility will determine the appropriate approach for designing the electrical distribution system for the specific application. The transformer is equal to or less than its rated kVA and rated voltage. Roles and Responsibilities Associated with Clearances, 1 of 8 7. <> Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Sound levels associated with certain kVA ratings will vary depending upon the type of transformer and manufacturer. K-rated transformers do not mitigate or eliminate harmonics. It shall be the customers Jana Ganion, Sustainability and Government Affairs Director. There are different ways in which transformers are installed and used as part of a commercial building electrical system. After I submit activities, construction or landscaping plans, what type of authorization will I receive for the use of a Duke Energy easement? It was great service with real professionalism from start to finish. 52 0 obj <> endobj document.getElementById('copyright').innerHTML = new Date().getFullYear(); This may call for compromises regarding the length of the conductors going to and/or from the transformer. The harmonics resulting from nonsinusoidal currents generate additional losses and heating of the transformer coils, which reduce the transformer life expectancy. The difference is they contain an enclosed tank with nitrogen or other dielectric gas to protect the windings. endstream endobj startxref 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. Although there are no moving parts in a transformer, the core does generate sound. Dangerous high voltage will be present within the transformer enclosure. ; 2 Unlimited revisions. Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. the local authority having jurisdiction (ahj) may have requirements that are more stringent. When speaking to consulting engineers on this topic, we've found that they recommend the cable be sized for the transformer's nameplate rating. Dry-type transformers have sound levels that are somewhat higher. Each test has a particular objective that helps determine a transformer's suitability for use. Our Professional Package is designed for our small business, or just-starting-out business clients. We really liked two of them, and asked him to amalgamate them. 0 0 Serious injury or death may result from climbing a tree and making direct contact with or coming too close to an energized line. Units lifted from the top core clamps will sometimes require that the top cover or part of the cover be removed. I was so impressed with the finished result that I've asked them to undertake future work. When people identify downed lines or trees touching power lines and act wisely, it minimizes the risk from trees contacting power lines. 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. 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. 847 0 obj <>stream %PDF-1.7 % It does not store any personal data. (Most of the information in these standards also can be applied to liquid-filled transformers.). Web(2) Subsurface horizontal transformer (see Table 5 and Table 6 on Page 6). Can I replace a tree that has been cut down? This cookie is set by GDPR Cookie Consent plugin. Great service. If in doubt about clearances, do not hesitate to call the transformer manufacturer. Under certain conditions, trees and tree limbs can conduct power if they come in contact with power lines. The secondary is 3-phase, 4-wire or Wye connected. Transformers, along with other power distribution apparatus, remain a fundamental component in electrical systems distribution for commercial buildings. hkO0ibv*JmG[$ 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. Some microprocessor-based electronic devices may not be able to withstand the voltage. Other site considerations require closer analysis. Our understanding of their general characteristics will allow the designer and end user to make the proper selection for the electrical system application. Copyright www.CreateLogoDesign.com. 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. Examination should be made before removing it from the railroad car or truck, and, if any damage is evident or any indication of rough handling is visible, a claim should be filed with the carrier at once and the manufacturer notified. Such terminations are available from electrical distributors. These considerations should be taken into account, as well as the use of sound absorbing materials on walls (for low frequency sound) and vibration isolation pads under the unit. To get your Company Logo developed by our experienced Logo Designers, please fill out our Order Form. You should consider this when planning the unit's installation. endobj 7. We also use third-party cookies that help us analyze and understand how you use this website. ]]> 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. If trees or limbs have fallen onto power lines, we will dispatch crews to clear the vegetation from power lines and equipment. When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. Structurally speaking, it's generally wiser to place a transformer as close as possible to a column. Also, with this information, it will be easier to plan site arrangements. 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. The difference in impedance should not exceed 7.5%. Preliminary inspection upon receipt of transformer. Our site is customized based on your location. Notification may be made via door hanger, telephone call, letter, in-person contact or a combination of these methods. Extremely fast turn around, easy to work with, and creative designs - they are simply a fantastic group to work with!! 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. Thanks! You also have the option to opt-out of these cookies. Air intake openings in the wall may be necessary or a larger minimum surrounding WebIntroduction, 1 of 7 Introduction. While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. It's recommended that all conducted tests comply with applicable ANSI/IEEE and NEMA standards. Necessary cookies are absolutely essential for the website to function properly. This type can be installed in areas with corrosive or dirty atmospheric conditions where it would be impossible to use a ventilated-type transformer. There are instances when a tree must be trimmed or removed outside of planned maintenance. They were very attentive to our needs, very detailed with their work, and met the needs of our timetable. For harmonic mitigation, K-rated transformers can be combined with harmonic filters or chokes. Transformers are usually designed and built to provide good electrical connections using either copper or aluminum cable. Our Premiere Package includes all desirable "upgrades". The cookie is used to store the user consent for the cookies in the category "Performance". The larger pieces of wood are cut to the length of firewood and stacked or consolidated at the edge of the right of way for the property owner's use or disposal. Both the voltages and currents should change in a similar fashion. These cookies do not store any personal information. %PDF-1.5 % 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. Click here to start this process. 450-10 and check the grounding of the neutral as applicable per NEC. 450-12 on Terminal Wiring Space. [CDATA[// >