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Trees can disrupt power in a number of ways. All windings should be checked for continuity. The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment. If you cannot gradually increase the load, then full load may be applied. There are instances when a tree must be trimmed or removed without prior notification. In this electrical system design, the transformer can be used as part of a substation, primary unit substation, secondary unit substation, or network configuration. Our site is customized based on your location. They have proactively gone above and beyond to do an exceptional job with everything. 837 0 obj
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The right tree or shrub, planted in the right place, can give you years of beauty and value without the potential dangers of getting too close to power lines. 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}(} 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. 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? Do you have experience and expertise with the topics mentioned in this content? How it Works. We do not round trees over because it contributes to poor tree health. Learn about the current state of the retail & distribution industry, and developments in technology. 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. These cookies will be stored in your browser only with your consent. After applying proper torque, you should wait a minute or so, and then re-tighten all bolts to the specified torque. Therefore, compatible versus incompatible species are subject to removal through mowing. Such terminations are available from electrical distributors. This was our second project and I knew exactly who I wanted to work with. You can have big-business results at a "business-on-a-budget" price! You should consider this when planning the unit's installation. Equipment operation characteristics will continue to change. Here, a transformer turns ratio indicator should be used to measure the ratio. Where their use is required, 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). They gave us 6 logo ideas to start with. transformers must be pre-approved by Duke Energy. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. The industry trend is to continue building transformers with less core losses, and that comply with Energy Star efficiency requirements. endobj
For this test, apply a low-voltage (240V or 480V) to the high-voltage winding and measure the output at the low-voltage winding. <>
]]> 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. While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. 2013-2014 | All Rights Reserved MERIT MEDIA INT. You should check the internal connections with the diagram on the nameplate to make sure they are correct for the application. Our Professional Package is designed for our small business, or just-starting-out business clients. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
When transformers are installed for parallel operation, their rated voltages, impedances, and turn ratios ideally should be the same and their phasor relationships identical. A right of way is a type of easement or agreement that grants a utility the right to use, access or transit a piece of property. 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. ;w]S9
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With the exception of emergency situations, we attempt to ask permission of the property owner before taking down trees in maintained or landscaped areas. Who should trim or cut trees around power lines? WebDuke Energy Transmission DECorp: Duke Energy Midwest . 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. * Applied and induced potentials, which verify dielectric strength. They were great at following our directions to the letter, while adding their own creative flair. No one should climb trees that are in the vicinity of power lines. 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. Never attempt to check the output voltage at the transformer. 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. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Duke Energy to invest $36B on power projects by 2026. Also, when aluminum conductors are used, give them a protective compound treatment at the terminal as specified by the cable manufacturer. Duke Energy contractors have been trained on the proper, safe and environmentally responsible techniques of managing plant growth. Well remember your selection for future visits. For harmonic mitigation, K-rated transformers can be combined with harmonic filters or chokes. In non-landscaped sites, pruned vegetation and wood are left in place to biodegrade. ; 4 Final files will be provided in any format. You also have the option to opt-out of these cookies. If the structure is wooden and 30 to 40 feet tall with or without transformers attached, it is typically a distribution pole. Are there transmission right-of-way uses that are prohibited? Hint: Duct Tape to the Rescue. To simplify installation, you should request from the manufacturer a simplified outline drawing of the transformer. However, anyone is encouraged to report unsafe conditions. You may lift transformers with enclosures having lifting lugs by using appropriate slings or chains. 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. To provide reliable service, Duke Energy must prune or remove trees along the power lines. Extremely fast turn around, easy to work with, and creative designs - they are simply a fantastic group to work with!! S=9X^&>``AT#l2}
ppC_H. Usually, lateral bracing and/or an extra solid anchorage will be required. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. 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 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 type is the most common to be used in the building indoor electrical system distribution. The difference in impedance should not exceed 7.5%. The secondary is 3-phase, 4-wire or Wye connected. "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} WebHow it Works. Also, with this information, it will be easier to plan site arrangements. Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. They supply the required incoming electrical service to the buildings. The same adjustment should be made to compensate for voltage drop in the output due to long cable runs. Our logos are stylish, unique and memorable. How do I request tree trimming or tree removal by Duke Energy? down from each of the ends of the long sides. Indoor transformers for nonlinear loads can be selected with a K rating, which allows the transformer to withstand nonlinear conditions in the electrical system. stream
Box of 1 Unit Trade Account Log In Log In to view price Specifications Products specifications Our Premiere Package includes all desirable "upgrades". You should ground the transformer as per NEC Sec. 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. On-site health department permit shall be in place at this time. ; 2 Unlimited revisions. 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. This article will continue in subsequent issues of EC&M. For example, trees can grow into the electrical equipment or fall across power lines, causing outages. They are very professional, and the team knows their craft. This may include personalization of content and ads, and traffic analytics. 1&Ub64#C #") "7KWpzJz1YeHB.r32Az{`gC~;jiV[Ceb*1rAz96lnA|3$ n"fyuAf[vz}:L3h0vjB)ta=T5MFKV3!YyeQ.\A?|1a/9 yQQ1KR8N:@Q.LCmGwP72juW*QW_8"DyP3(\gjQ8qCZA{xGW*-EETOzk~h+,I`=p 3
You will not be disappointed, i promise. In addition, the size of the commercial facility will determine the appropriate approach for designing the electrical distribution system for the specific application. Duke Energy schedules periodic vegetation maintenance along power lines to minimize outages caused by trees in or near transmission and distribution rights of way. 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. See my site logo at. Regardless of manufacturer, you should carefully follow these instructions to ensure adequate safety to personnel and equipment. 0
(3) Subway-LB transformer (see Table 8 on Page 7). We understand how critical a logo is to the success of your business. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr more than ten (10) 600 MCM or smaller conductors per phase, or more than eight (8) 820 0 obj
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When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. Each test has a particular objective that helps determine a transformer's suitability for use. 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, Who can request trimming or removal of a tree? Call, For additional information please visit our. 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. 2023 Endeavor Business Media, LLC. Before energizing a 3-phase transformer, you should arrange to monitor the voltages and currents on the low-voltage side. * Insulation power factor, which is done at initial installation and every few years thereafter to help determine the aging process of the insulation. 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. 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. Several transformer types rated higher than 600 V for oil insulated type, higher than 35,000 V for dry type, and other transformers rated higher than 600 V are required to be located in vault rooms, which must be built with fire-rated enclosures depending on the transformer type and applicable local authority requirements, when indoors. 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. Adequate surrounding air space must be maintained for the required transformer "heat loss" ventilation. 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 is for the Business or Corporate Client who wishes to have more options to choose from and have grayscale logos too. Before working on the connections make sure all safety precautions have been taken. Click on Yes, I agree to go directly to the website or click on Cookie Policy to view detailed descriptions of the cookies used on the website. 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). Revision 009 Effective Date 02/18/2022 . Will I be notified before a tree crew comes to cut trees in my yard? When placed inside or on top of a building, you must consider structural capabilities because a transformer represents a highly concentrated load. To know about this special offer, please click here. We work diligently to capture the look and feel that you always desired for your logo. The installation of conductors should be performed only by personnel qualified and experienced in high-voltage equipment. Foundation preparation usually includes an evaluation of soil characteristics and concrete work. You may also hire a company to remove the debris or contact your local public works to see if they remove yard debris. If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. 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. If an imminent threat to Duke Energy power lines exists, we prioritize and schedule the work based on the severity of the situation. 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. Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment.