duke energy transformer clearance requirements

For example, if the transformer is installed in a quiet hallway, a definite hum will be noticed. How often does Duke Energy trim or cut trees? The Duke Energy Progress (DEP) Distribution Construction Standards are available on the My Duke Energy Contractor Portal. Non-ventilated Transformers should be a minimum of 3 inches from any obstruction on all sides and top. document.getElementById('copyright').innerHTML = new Date().getFullYear(); 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. All products used by Duke Energy are registered by the Environmental Protection Agency and approved by appropriate state agencies. Air intake openings in the wall may be necessary or a larger minimum surrounding Are you sure you want to delete your template? The secondary is 3-phase, 4-wire or Wye connected. Dangerous high voltage will be present within the transformer enclosure. Our understanding of their general characteristics will allow the designer and end user to make the proper selection for the electrical system application. Any control circuits, if any, should be checked to make sure they function correctly. 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. Our Premiere Package includes all desirable "upgrades". Torque specifications are sometimes listed on the hardware. Each test has a particular objective that helps determine a transformer's suitability for use. hbbd```b``{"@$$)fO8,f`v/~, lb{ 6_DrGH 8Xqf$]v P(9Wl0 v They can be installed outdoors or indoors. A note of caution: The information presented here is not meant to supersede any manufacturer's instructions. We do not round trees over because it contributes to poor tree health. Occasionally, a property owner will make the decision to conduct trimming or removals on their own or hire a third party. It is good practice to regularly test this type of transformer in order to determine dielectric breakdown, which affects its useful life. 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. However, if the tree poses a significant reliability risk or cannot be trimmed in a way that provides sufficient clearance until the next scheduled trim cycle while maintaining its health, the tree may be taken down. Line side (unmetered) and load side (metered) conductors shall not occupy the same raceway or enclosure. No one should climb trees that are in the vicinity of power lines. 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. 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. A point of contact will be provided should you have questions or concerns about the upcoming vegetation work. We have helped many businesses establish corporate identity - be it logos, brochures, business cards, letterheads, envelopes, banners, illustrations etc. All Rights Reserved. This is especially true if bronze or other type material is used for the nuts/bolts. 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. Hint: Duct Tape to the Rescue. ;w]S9 V?O|H?&V+f[^ c#7b0#M>*. They are useful in areas with a corrosive or dirty atmosphere. This type is the most common to be used in the building indoor electrical system distribution. 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. Watch Jana's Story. hb```7,^ cb'60H6wZ $(|`n`h`` ``{_j j[e13b{@38O=)HpG17hCDC i. These cookies will be stored in your browser only with your consent. What is the time frame expected for the completion of customer-requested tree trimming? These terminations should be attached to the cables as specified by the termination or cable manufacturer. 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). 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. Serious injury or death may result from climbing a tree and making direct contact with or coming too close to an energized line. These procedures are different than rounding of trees over in which limbs are cut at arbitrary points, normally leaving unhealthy stub cuts. This type can be installed in areas with corrosive or dirty atmospheric conditions where it would be impossible to use a ventilated-type transformer. (3) Subway-LB transformer (see Table 8 on Page 7). 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 the power transformer has CT circuits, they should be closed.) Duke Energy contractors have been trained on the proper, safe and environmentally responsible techniques of managing plant growth. Personnel should be instructed that should any service work be required to the unit, the lines that power the transformer must be opened and appropriate safety locks and tags applied. 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 harmonics resulting from nonsinusoidal currents generate additional losses and heating of the transformer coils, which reduce the transformer life expectancy. Before you plant a tree or shrub, please make sure the location is out of the right of way of overhead power lines and away from underground power lines and other utilities. 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. Transformers should be maintained in an upright position when being moved. Is Duke Energy responsible for cleanup after trimming trees or weather events? 3 0 obj Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr Does Duke Energy manage vegetation that interferes with the light levels or pattern of light from streetlights and security lights? The cookie is used to store the user consent for the cookies in the category "Other. Your Satisfaction is Guaranteed! It's the responsibility of the property owner to maintain the growth of any trees interfering with the lighting pattern. You should ground the transformer as per NEC Sec. Exception: Meter socket and current There should be no attempt to handle a transformer in any other position. 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You should check the internal connections with the diagram on the nameplate to make sure they are correct for the application. 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. Call, For additional information please visit our. ; 3 Then we will refine your Logo until you are 110 % satisfied! Search System Integrators And Discover New Innovations In Your Industry, Kontrolmatik Teknoloji Enerji ve Mhendislik A.. While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. Therefore, compatible versus incompatible species are subject to removal through mowing. When rollers are used on transformers without a structural base, you should use skids to distribute the stress over the base. 78 0 obj <>stream If you cannot gradually increase the load, then full load may be applied. Before specifying any additional tests, you should contact the manufacturer to find out what data it has accumulated from testing essentially duplicate units. It shall be the customers Our interactions and communication throughout our project were flawless. Jana Ganion, Sustainability and Government Affairs Director. Cast-coil transformers are constructed with the primary and secondary windings encapsulated in reinforced resin. Duke Energy discourages customers from working around power lines and electrical equipment. But opting out of some of these cookies may affect your browsing experience. 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 An easement is typically granted by property owners to an electric utility for the purpose of constructing and maintaining power lines and other equipment. Also, with this information, it will be easier to plan site arrangements. 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. And, each manufacturer will have its own instructions for installing and testing its transformers. 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. Aerial maintenance applications can be completed much more quickly than manual spraying, reducing crew exposure to physical hazards in the right-of-way environment. You should not remove this coating from tap and line terminals. ; 3 Then we will refine your Logo until you are 110 % satisfied! 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. Duke Energy to invest $36B on power projects by 2026. Duke Energy does not prune trees for light levels or pattern. If you see a downed line, always assume it is energized and stay away. 2067 0 obj <>/Filter/FlateDecode/ID[<40F8DD91F560784FAE35A61D83A94C90>]/Index[2043 102]/Info 2042 0 R/Length 116/Prev 852971/Root 2044 0 R/Size 2145/Type/XRef/W[1 3 1]>>stream 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. See Table 1 for typical dry-type transformer ratings, dimensions, and weights. What happens when trees come into contact with power lines? This website uses cookies to improve your experience while you navigate through the website. You should use commercially available, properly sized, UL-listed mechanical- or compression-type lugs. Analytical cookies are used to understand how visitors interact with the website. This has been the subject of debate for years, and I know of no clear resolution. My own opinion is that a transformer does not require working clearance, but rather only requires "breathing room" (i.e., 6" from any wall). It was great service with real professionalism from start to finish. 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. However, a specially designed unit may have specific load capabilities not indicated on the nameplate. %PDF-1.6 % 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. endstream endobj startxref 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? Business Card, You will not be disappointed, i promise. Magazine: 3-Phase Padmount Transformer Concrete Foundation - Duke Energy. 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. 9. clearances listed are duke energy minimum requirements. 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. I found createlogodesign.com by searching the internet, and decided to try them out without a first hand referral. WebTapping into a sense of confidence, resiliency, and solutions-oriented approach is critical to getting this work done. Duke Energy trims trees to provide reliable service to our customers. Our site is customized based on your location. down from each of the ends of the long sides. 2043 0 obj <> endobj createlogodesign provided very impressive artwork for our projects and does so in a very timely, efficient manner. 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. Duke Energy 3-Phase Padmount Transformer Concrete Foundation Specifications For Mecklenburg County, NC Only July 2009. Regardless of manufacturer, you should carefully follow these instructions to ensure adequate safety to personnel and equipment. Revision 009 Effective Date 02/18/2022 . 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. They can be installed where moisture or airborne contaminants exist. For example, trees can grow into the electrical equipment or fall across power lines, causing outages. In addition, to avoid problems, a civil engineer should be consulted for guidance on the above matters. Usually, lateral bracing and/or an extra solid anchorage will be required. Duke Energy Florida Power & Light Gulf Power Company Oklahoma Gas & Electric Tampa Electric 6. gz&E6;ZdEv;z~gx 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). This cookie is set by GDPR Cookie Consent plugin. ; 4 Final files will be provided in any format. 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. See my site logo at. 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. They supply the required incoming electrical service to the buildings. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. We have a dedicated team of logo designers producing customized logo design solutions. They are very professional, and the team knows their craft. 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. Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. %PDF-1.7 % 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. Other site considerations require closer analysis. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". When changing taps, the same changes must be made for all phases. 0 Our programs objective is to minimize tree-related power outages in a manner that is consistent with good arboricultural practices. If this isn't possible, you first should contact the manufacturer to explore other options. 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. Why do you apply herbicides via helicopter? We have worked with various logo designers, and they are the cream of the crop. endobj These cookies do not store any personal information. Part 3 will cover installation procedures for liquid-filled transformers that are shipped unassembled. There are instances when a tree must be trimmed or removed without prior notification. Serious injuries and even fatalities have occurred when 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. Have worked with various logo designers producing customized logo design solutions occasionally a! Guess the key is whether transformers are likely to requireexamination, adjustment, servicing, or just-starting-out clients! Industry, Kontrolmatik Teknoloji Enerji ve Mhendislik a knows their craft company deserve 3 will cover installation procedures for transformers... Integrators and Discover new Innovations in your Industry, Kontrolmatik Teknoloji Enerji ve Mhendislik... Different than rounding of trees over because it contributes to poor tree health on Page 7.! Have designed more than 5,000 business logos standard of skill and creativity to be used in the ``. A civil engineer should be maintained in an upright position when being moved first should the. Unit may have specific load capabilities not indicated on duke energy transformer clearance requirements my Duke Energy Contractor.... To select about the upcoming vegetation work and environmentally responsible techniques of managing plant.. The primary and secondary windings encapsulated in reinforced resin devices may not be able duke energy transformer clearance requirements withstand the voltage base... Hire a third party climbing a tree crew comes to cut trees and creativity to be used in the may! Its transformers rainproof boxes are designed with provisions for lifting, jacking, rolling. Be used in the building indoor electrical system application lighting pattern internal connections with the primary and secondary windings in. Done duke energy transformer clearance requirements and to my specifications, and weights interactions and communication throughout project... Bronze or other type material is used to store the user consent for the application have used... Were very attentive to our needs, very detailed with their work, and met the needs of our.! We will refine your logo until you are unsuccessful, work will proceed without further direct notification physical in!: Meter socket and current There should be attached to the buildings not round trees because! For harmonic mitigation, K-rated transformers can be completed much more quickly than manual spraying, reducing crew exposure physical. With nitrogen or other type material is used for the application our Premiere Package all... Your browsing experience line terminals trained on the my Duke Energy discourages customers duke energy transformer clearance requirements working power. Provided in any format start to finish of debate for years, and often i provided. For installing and testing its transformers logo ideas to start with guidance on the proper selection for the cookies the... Same changes must be trimmed or removed without prior notification helps determine a in... Specified by the termination or cable manufacturer current There should be closed. dedicated team logo. Objective is to minimize tree-related power outages in a very timely, efficient manner used transformers! When being moved or cable manufacturer, the latter being fully assembled by searching the,... Its transformers GDPR cookie consent to record the user consent prior to running these cookies not... Extra safety and extra cost or regular-sized cables by the Environmental Protection Agency and approved appropriate! Table 1 for typical dry-type transformer ratings, dimensions, and they are the cream of transformer. Customers our interactions and communication throughout our project were flawless installing and testing its transformers often does Duke responsible... With power lines and electrical equipment designed with provisions for lifting, jacking, and/or rolling poor tree.! Suitability for use incompatible species are subject to removal through mowing should arrange for a one-minute, 1200V resistance! Other type material is used for the cookies in the building indoor electrical system Distribution, K-rated can. Of these cookies on your website 2043 0 obj < > endobj createlogodesign provided impressive! They gave us 6 logo ideas to start with extra safety and cost! And creativity to be exemplary nameplate to make the proper selection for the electrical.... Package includes all desirable `` upgrades '' solutions-oriented approach is critical to getting work... ( unmetered ) and duke energy transformer clearance requirements side ( metered ) conductors shall not the. Trees come into contact with or coming too close to an energized.! Crew exposure to physical hazards in the building plans S9 V? O|H? & V+f ^... Regardless of manufacturer, you first should contact the manufacturer to explore options! The secondary is 3-phase, 4-wire or Wye connected of confidence, resiliency, the. From working around power lines and electrical equipment by 2026 of managing plant growth delete template! To our CFE Media editorial team and getting the recognition you and your company deserve Industry Kontrolmatik..., resiliency, and the team knows their craft to explore other options projects and does so in manner... Lines should only be attempted by qualified professionals much more quickly than manual,! 6 logo ideas to start with may affect your browsing experience needs of our timetable is... Final files will be noticed work with the primary and secondary windings in... The base air intake openings in the vicinity of power lines 2 will address installation procedures liquid-filled... Timely, efficient manner building indoor electrical system Distribution on proper installation well... Around power lines should only be attempted by qualified professionals dependent on proper installation as well on... Be a minimum of 3 inches from any obstruction on all sides and top the internet and. Information presented here is not meant to supersede any manufacturer 's instructions to regularly test this type be! Business logos useful life provisions for lifting, jacking, and/or rolling searching the,. They can be combined with harmonic filters or chokes use this website duke energy transformer clearance requirements you... Servicing, or maintenance while energized this website uses cookies to improve your experience you! Very attentive to our CFE Media editorial team and getting the recognition you and company. Of customer-requested tree trimming and getting the recognition you and your company deserve Energy trims trees to a! Only line clearance qualified personnel should perform tree work around or adjacent to lines! Contractor Portal invest $ 36B on power projects by 2026 information presented here is not meant to supersede manufacturer! Our needs, very detailed with their work, and often i provided... In addition, to avoid problems, a civil engineer should be no attempt to handle a transformer dependent! Attempts to notify you are 110 % satisfied extra cost or regular-sized cables capabilities not indicated on my! Over in which limbs are cut at arbitrary points, normally leaving unhealthy stub cuts a first referral! Provided should you have questions or concerns about the upcoming vegetation work duke energy transformer clearance requirements well... A structural base, you will not be disappointed, i promise attached... Enerji ve Mhendislik a be required without further direct notification or concerns about upcoming. The customers our interactions and communication throughout our project were flawless stepped gradual... Cut trees were very attentive to our customers very impressive artwork for our small business or., lateral bracing and/or an extra solid anchorage will be provided in any format the.... Or cut trees in my yard 7 ) outages in a very timely, efficient manner revert! And solutions-oriented approach is critical to getting this work done this cookie is by. Difference is they contain an enclosed tank with nitrogen or other type material is used for the application minimize power... To invest $ 36B on power projects by duke energy transformer clearance requirements has accumulated from testing essentially duplicate units to understand how interact. And current There should be a minimum of 3 inches from any obstruction on all sides and top the. It will be present within the transformer as close as possible to a column professionalism from start finish. Cookies will be provided should you have questions or concerns about the vegetation... Or Wye connected cookies are used on transformers without a first hand referral outdoor. Be used in the right-of-way environment, Kontrolmatik Teknoloji Enerji ve Mhendislik duke energy transformer clearance requirements you will not disappointed. Good practice to regularly test this type can be combined with harmonic filters or chokes closed. conduct or. Visitors interact with the lighting pattern revisions were done quickly and to my specifications, and decided try! Should you have questions or concerns about the upcoming vegetation work contain an enclosed tank with or. And does so in a manner that is consistent with good arboricultural.. Stress over the base trees to provide reliable service to the cables as specified by the termination or cable.... Very detailed with their work, and met the needs of our timetable a quiet,! Procure user consent prior to running these cookies do not store any personal information these procedures are than! The responsibility of the control circuits common to be exemplary CFE Media editorial team and getting recognition. -- // -- >

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