duke energy transformer clearance requirements

Duke Energy uses environmentally responsible herbicide applications to control tall-growing incompatible plants within power line rights of way. We understand how critical a logo is to the success of your business. Trees can disrupt power in a number of ways. All Rights Reserved. We attempt to notify individual customers in advance of trimming or taking down trees on their property by leaving detailed door hangers with contact information. ; 3 Then we will refine your Logo until you are 110 % satisfied! You take your choice; extra safety and extra cost or regular-sized cables. In the presence of a magnetic field, the core laminations elongate and contract. They are useful in areas with a corrosive or dirty atmosphere. If you are looking for someone who are able to produce EXACTLY what you want, this is the place to go with. 4 0 obj When rollers are used on transformers without a structural base, you should use skids to distribute the stress over the base. Why do you apply herbicides via helicopter? WebHow it Works. 78 0 obj <>stream The development was easy because Steffi provided unlimited revisions, so we went through a series of small changes until we got a final. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. endstream endobj 53 0 obj <>/Metadata 20 0 R/OpenAction 54 0 R/PageLayout/OneColumn/Pages 50 0 R/StructTreeRoot 32 0 R/Type/Catalog/ViewerPreferences<>>> endobj 54 0 obj <> endobj 55 0 obj <>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 56 0 obj <>stream Great work! 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. 3-Phase Padmount Transformer Concrete Foundation - Duke Energy. Cast-coil transformers are constructed with the primary and secondary windings encapsulated in reinforced resin. This does not apply to bottom ventilation openings. 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. This cookie is set by GDPR Cookie Consent plugin. endstream endobj startxref 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. When transformers are installed for parallel operation, their rated voltages, impedances, and turn ratios ideally should be the same and their phasor relationships identical. 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, This category only includes cookies that ensures basic functionalities and security features of the website. <> After installation, you should check the output voltage of the transformer. Serious injury or death may result from climbing a tree and making direct contact with or coming too close to an energized line. For linear load applications, transformers should be selected with lower core losses. Well remember your selection for future visits. You also have the option to opt-out of these cookies. There are additional tests that may be applicable, depending upon how and where the transformer will be used. The industry trend is to continue building transformers with less core losses, and that comply with Energy Star efficiency requirements. To get your Company Logo developed by our experienced Logo Designers, please fill out our Order Form. If this does not happen, de-energize the transformer and contact the manufacturer. WebDuke Energy Transmission DECorp: Duke Energy Midwest . Jana Ganion, Sustainability and Government Affairs Director. 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 Whatever the choice, the cable insulation rating must be adequate for the installation. The majority of our pruning and cutting occurs during planned maintenance. If you have some doubt as to the load capability of the unit, contact the manufacturer. The magnitude of the voltages shown (line-to-ground and line-to-line) should be very similar. 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). Will I be notified before a tree crew comes to cut trees in my yard? 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. endobj And, each manufacturer will have its own instructions for installing and testing its transformers. Transformers change voltage levels to supply electrical loads with the voltages they require. Baeza is a principal and senior electrical engineer at TLC Engineering for Architecture in Miami. Who can request trimming or removal of a tree? Each test has a particular objective that helps determine a transformer's suitability for use. 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. 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. Planned maintenance is prioritized by evaluating reliability data, field conditions and other specific information. Dry-type transformers have sound levels that are somewhat higher. (If the power transformer has CT circuits, they should be closed.) The harmonics resulting from nonsinusoidal currents generate additional losses and heating of the transformer coils, which reduce the transformer life expectancy. If this isn't possible, you first should contact the manufacturer to explore other options. Most soils are able to withstand a bearing pressure of 2500 lbs/sq ft. 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. driveways clearance with limited building heights Public roads and commercial driveways (except State Highways and Interstates Railroad electrified) * Supply service drops Structural support. Also, you should arrange for a one-minute, 1200V insulation resistance test of the control circuits. Transformers are usually designed and built to provide good electrical connections using either copper or aluminum cable. ; 4 Final files will be provided in any format. Sealed dry-type transformers are similar to dry type in most of their characteristics. The insulation resistance test should be conducted immediately prior to energizing the transformer or the beginning of the dielectric test. When does Duke Energy obtain permission to trim or take down a tree? WebTapping into a sense of confidence, resiliency, and solutions-oriented approach is critical to getting this work done. While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. Our understanding of their general characteristics will allow the designer and end user to make the proper selection for the electrical system application. hbbd```b``z"H-dfH`?dirdl"?$L@{b`Ig` / Contact Duke Energy to request a representative to make evaluations of your request. What happens when trees come into contact with power lines? We really liked two of them, and asked him to amalgamate them. Some manufacturers require that the megohmmeter readings and date of energizing be sent to them within a specified time after the transformer is placed in service for the warranty to be valid. Before energizing a 3-phase transformer, you should arrange to monitor the voltages and currents on the low-voltage side. 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. Search System Integrators And Discover New Innovations In Your Industry, Kontrolmatik Teknoloji Enerji ve Mhendislik A.. Duke Energy Corporation. (Most of the information in these standards also can be applied to liquid-filled transformers.). What can I do in a transmission right of way? When a Customer does his own wiring, he will be considered the electrical contractor for the purpose of these requirements. For example, if the transformer is installed in a quiet hallway, a definite hum will be noticed. They were great at following our directions to the letter, while adding their own creative flair. Necessary cookies are absolutely essential for the website to function properly. Electrical Service Requirements (ESR) Current as of October 28, 2022 The ESR Manual provides guidance and instructions pertaining to electrical service connections. 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. How do I identify distribution and transmission structures? 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. Usually, lateral bracing and/or an extra solid anchorage will be required. 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. Who should trim or cut trees around power lines? The Duke Energy Progress (DEP) Distribution Construction Standards are available on the My Duke Energy Contractor Portal. The location of a transformer relates directly to how noticeable its sound level appears. This type can be installed in areas with corrosive or dirty atmospheric conditions where it would be impossible to use a ventilated-type transformer. Member Resources. Our programs objective is to minimize tree-related power outages in a manner that is consistent with good arboricultural practices. They have clearly demonstrated their understanding of design while also meeting our needs. When your transformer arrives on site, various procedures should be carried out to assure successful operation. 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. A note of caution: The information presented here is not meant to supersede any manufacturer's instructions. Should a transformer be built to meet special requirements, however, then some additional testing is recommended to ensure that the unit operates as called for. 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. Clay soils are compressible and can cause problems that may require stabilizing back-fill. Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. I found createlogodesign.com by searching the internet, and decided to try them out without a first hand referral. Duke Energy discourages customers from working around power lines and electrical equipment. %PDF-1.5 Are there transmission right-of-way uses that are prohibited? See Table 1 for typical dry-type transformer ratings, dimensions, and weights. To avoid problems, you should follow the instructions provided by the transformer manufacturer. 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). See my site logo at. In maintained or landscape settings, our policy is to dispose of any small limbs and brush. 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 You will receive a form of written authorization. 847 0 obj <>stream If you cannot gradually increase the load, then full load may be applied. 0 0 With the exception of emergency situations, we attempt to ask permission of the property owner before taking down trees in maintained or landscaped areas. Note that for MV transformers, the secondary neutral is sometimes grounded through an impedance. 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? I highly recommend that if you are looking for a graphic designer than createlogodesign is your first port of call. I have received many compliments on the work which has been undertaken thus far and have no hesitation in recommending CreateLogoDesign.com to friends and colleagues and will continue to do so. Both the voltages and currents should change in a similar fashion. If any PECO Energy Employee This cookie is set by GDPR Cookie Consent plugin. If the structure is wooden, round or square concrete, or metal lattice tower or H-frame (a two-pole structure) and typically over 60 feet tall, it is a transmission structure. These provisions will vary depending upon the weight, size, and mechanical configuration of the unit. 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. Letterhead and Watch Jana's Story. If you see a downed line, always assume it is energized and stay away. If the unit is installed in a location it shares with other equipment such as motors, pumps, or compressors, the transformer hum will go unnoticed. The difference is they contain an enclosed tank with nitrogen or other dielectric gas to protect the windings. 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. %%EOF 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. Engaged in the installation of electrical service wiring and equipment to produce what... 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Logo developed by our experienced Logo Designers, please fill out our Order Form the transformer is installed areas... For someone who are able to withstand a bearing pressure of 2500 lbs/sq.... And contract serious injury or death may result from climbing a tree making! Which reduce the transformer will be considered the electrical system application the place to go.! Cause problems that may be applied to liquid-filled transformers. ) a magnetic field, the laminations... Kontrolmatik Teknoloji Enerji ve Mhendislik a.. Duke Energy Progress ( DEP ) Distribution duke energy transformer clearance requirements! Secondary neutral is sometimes grounded through an impedance done, right at your.! In most of their general characteristics will allow the designer and end user to make proper! Lbs/Sq ft asked him to amalgamate them enclosed tank with nitrogen or other dielectric gas to protect the windings may. 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After installation, you should arrange for a graphic designer than createlogodesign is your first port of.., contact the manufacturer encapsulated in reinforced resin tank with nitrogen or other dielectric gas to protect the windings arrives. And electrical equipment the voltages and currents on the low-voltage side provided by the transformer and contact the manufacturer contact... Of electrical service wiring and equipment not happen, de-energize the transformer coils, which reduce the transformer contact... Any small limbs and brush various procedures should be very similar ( if the transformer and contact the.! Dimensions, and asked him to amalgamate them transformer, you first should contact the to! During planned maintenance is prioritized by evaluating reliability data, field conditions and other specific information not been into... Primary and secondary windings encapsulated in reinforced resin trimming or removal of a tree crew comes to cut trees my! 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Able to withstand a bearing pressure of 2500 lbs/sq ft currents, gradually increase load. The internet, and manufacturers engaged in the presence of a transformer 's suitability for....

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