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 Foundations. hkO0ibv*JmG[$ When does Duke Energy trim a tree versus take down a tree? If the structure is wooden and 30 to 40 feet tall with or without transformers attached, it is typically a distribution pole. Before energizing a 3-phase transformer, you should arrange to monitor the voltages and currents on the low-voltage side. There should be no attempt to handle a transformer in any other position. When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. 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. document.getElementById('copyright').innerHTML = new Date().getFullYear(); 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. 837 0 obj <>/Filter/FlateDecode/ID[<628CD90D08ABAB4FB038EF4B9C9C7E56>]/Index[820 28]/Info 819 0 R/Length 84/Prev 192869/Root 821 0 R/Size 848/Type/XRef/W[1 2 1]>>stream Some equipment could have a different torque requirement than shown. 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. 1&Ub64#C #") "7KWpzJz1YeHB.r32Az{`gC~;jiV[Ceb*1rAz96lnA|3$ 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. 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. 3 0 obj Disposal of any wood, limbs or debris resulting from this type of emergency operation is the responsibility of the property owner. 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. To get your Company Logo developed by our experienced Logo Designers, please fill out our Order Form. Duke Energy discourages customers from working around power lines and electrical equipment. 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. Are there transmission right-of-way uses that are prohibited? Our objective is to promote low-growing vegetation to minimize potential electric power interruptions, which also enhances wildlife habitat. Dry-type transformers have sound levels that are somewhat <> If you see a fallen tree in contact with a power line, immediately contact Duke Energy. When you start making the connections between the transformer's terminals and the incoming and outgoing conductors, carefully follow the instructions given on the nameplate or on the connection diagram. If appropriate, supports should be used so that the transformer enclosure is not crushed when the unit is lifted. driveways clearance with limited building heights Public roads and commercial driveways (except State Highways and Interstates Railroad electrified) * Supply service drops Who should trim or cut trees around power lines? Roles and Responsibilities Associated with Clearances, 1 of 8 The tap setting should also be verified for the proper voltage. Reproduction, hToSU}W`lq;!%Ya82/>Z%&t-v @4Fi)<4Q#`xn\ H h `eXZ[5baH889j UpuUdb1eFl*]F~`[_(`ul)iYJ:Jg@CzgrD6Dr-'vv(J2wfjA!fn+ZFg,y@)sqUXhgl{/5=9pn*-XGpcNZOZW,V2gTq,g W@01!86)mA3T$+'vrLA{0Q5 /Z5T* `=|pi})q\HO N|QjmGM1efL>kf(LXJ&|k\{11}7{C7zox>/n7E3p:? Can I replace a tree that has been cut down? 9. clearances listed are duke energy minimum requirements. The greater the differences in these parameters, the greater the magnitude of the circulating current. This cookie is set by GDPR Cookie Consent plugin. Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. Webrequirements. Sealed dry-type transformers are similar to dry type in most of their characteristics. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Selecting, sizing transformers for commercial buildings, By using this website, you agree to our use of cookies. Great service. Re-tighten all cable retaining bolts after the first 30 days of service. 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. Hint: Duct Tape to the Rescue. Is Duke Energy responsible for cleanup after trimming trees or weather events? Our Premiere Package includes all desirable "upgrades". When speaking to consulting engineers on this topic, we've found that they recommend the cable be sized for the transformer's nameplate rating. ]]> Duke Energy schedules periodic vegetation maintenance along power lines to minimize outages caused by trees in or near transmission and distribution rights of way. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k. And, each manufacturer will have its own instructions for installing and testing its transformers. You should consider this when planning the unit's installation. In the presence of a magnetic field, the core laminations elongate and contract. Your Satisfaction is Guaranteed! Transformers are designed with provisions for lifting, jacking, and/or rolling. Some transformer manufacturers recommend that the cable size be based on an ampacity level of 125% of nameplate rating. 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. Before a power line is built, Duke Energy acquires easements from property owners along the selected route. When specifying a transformer to be operated in parallel with existing units, all these parameters should be discussed with the transformer manufacturer. The cookies is used to store the user consent for the cookies in the category "Necessary". To avoid problems, you should follow the instructions provided by the transformer manufacturer. 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. On-site health department permit shall be in place at this time. The insulation resistance test should be conducted immediately prior to energizing the transformer or the beginning of the dielectric test. We will most definitely return should we have additional needs!! These cookies will be stored in your browser only with your consent. 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. With your ideas in mind, our skilled logo designers will be quick and creative enough to create an eye-catching logo. Well remember your selection for future visits. We also use third-party cookies that help us analyze and understand how you use this website. YUMPU automatically turns print PDFs into web optimized ePapers that Google loves. 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. Duke Energy Carolinas Distribution Construction Standards Reference Guide The Duke Energy Carolinas Distribution Construction Standards consist of the following documents available on Preliminary inspection upon receipt of transformer. The difference in impedance should not exceed 7.5%. We will definitely work with them in the future, and recommend them to anyone who is serious about having quality work done for business. It's important that you have an understanding of the manufacturer's warranty. 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. 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. If this does not happen, de-energize the transformer and contact the manufacturer. They contain an enclosure surrounding the windings for their mechanical protection and the safety of personnel. Even mounting the unit a distance that is an exact multiple of the 120 Hz wavelength from a solid reflective surface may reinforce the sound waves, causing the transformer to seem louder than it actually is. 3, on page 42. Representative torque requirements for making connections using steel nuts/bolts are shown in Table 1, on page 42. xr]U)\8R.Uj;7YU`Kb%%R1C$31WKG~{j2vS}[jtG^_GDo//H$$nwyFwhiDxEMtlf\2*2$:"_]@-X.N)C5Y&`OQDd$7(m\0"z,QJ2 >>}Mz"8u!M k*)["o?\59+7>jy@:5iVwD"AS We have worked with various logo designers, and they are the cream of the crop. If an imminent threat to Duke Energy power lines exists, we prioritize and schedule the work based on the severity of the situation. The location should not expose the transformer to possible damage from cranes, trucks, or moving equipment. If you have some doubt as to the load capability of the unit, contact the manufacturer. For harmonic mitigation, K-rated transformers can be combined with harmonic filters or chokes. Any control circuits, if any, should be checked to make sure they function correctly. (3) Subway-LB transformer (see Table 8 on Page 7). Exercise care during handling to prevent equipment damage and/or personnel injury. The distance increases with voltage for all voltages equal to or higher than 50,000 volts. Transmission Systems . Some principles to consider for transformer installation include locating them in isolated rooms with proper ventilation, clearances, and accessibility. Make sure the rigging crew is experienced in lifting and moving heavy delicate equipment. Equipment operation characteristics will continue to change. Nonventilated dry-type transformers are similar to the ventilated type but are totally enclosed. 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? The development was easy because Steffi provided unlimited revisions, so we went through a series of small changes until we got a final. 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. Createlogodesign were fantastic. Sound levels associated with certain kVA ratings will vary depending upon the type of transformer and manufacturer. By studying the overall mounting and terminal dimensions, it's possible to plan the installation with an orderly arrangement of connections. We are delighted with the end result, it looks incredibly professional. There are different construction types for transformers used in commercial buildings. 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. For units with ratings above 500kVA to 2500kVA, a typical concrete base would be 8 ft by 9 ft and 10 in. Necessary cookies are absolutely essential for the website to function properly. You CANNOT go wrong by choosing them! Transmission easement documents can be located in their respective countys deeds and records department. 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. None of our competitors offer this kind of unique service. endobj Here, a transformer turns ratio indicator should be used to measure the ratio. 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. When your transformer arrives on site, various procedures should be carried out to assure successful operation. 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. Installing transformers in existing structures may require an analysis of the building for structural support capability since the original structural information may not be available. Under certain conditions, trees and tree limbs can conduct power if they come in contact with power lines. Trees are assessed on a case-by-case basis. %%EOF This article will continue in subsequent issues of EC&M. Blue Lake Rancheria. 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 transformer should be jacked evenly on all four corners to prevent warping or tipping over. 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. All products used by Duke Energy are registered by the Environmental Protection Agency and approved by appropriate state agencies. Occasionally, the installation of some method of sound abatement will be called for. Duke Energy contractors have been trained on the proper, safe and environmentally responsible techniques of managing plant growth. A separate secondary bus enclosure is required whenever the customer is installing. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. If the transformer can't be lifted by a crane, it can be skidded or moved on rollers, as shown in Fig. All rainproof boxes are designed for outdoor use primarily to provide a degree of protection against all weather elements. 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. Another consideration for indoor distribution transformers is the type of load: linear or nonlinear. Notification may be made via door hanger, telephone call, letter, in-person contact or a combination of these methods. However, they do protect the transformer itself from damage caused by harmonics. And its important that you follow current NEC practice and applicable local codes. The installation of conductors should be performed only by personnel qualified and experienced in high-voltage equipment. 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. 4 0 obj * Applied and induced potentials, which verify dielectric strength. 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. Occasionally, a property owner will make the decision to conduct trimming or removals on their own or hire a third party. Our understanding of their general characteristics will allow the designer and end user to make the proper selection for the electrical system application. The revisions were done quickly and to my specifications, and often I was provided multiple versions from which to select. Use of alternate means of fire protection must be approved by the local code enforcement authority. Some applications require a reduced sound level, such as a large unit in a commercial building with people working close to it. 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. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k, `h`` ``{_j j[e13b{@38O=)HpG17hCDC i. For example, the code-based demand load of a 208 Y/120 V, 3-phase, 4-wire panelboard is 42 kVA, which does do not include spare capacity for future growth. Develop a procedure for inventory of all tools, hardware, and any other objects used in the inspection, assembly, and testing of the transformer. fzVAm_mRJ}GoE>Mb-LBo^8p:>db[[wRI)9:K^>P[A$K)-Jc]!AwDI3rJ7aZVv0%DYxX^{{iQ]7-n%3wvg=yr How do I request tree trimming or tree removal by Duke Energy? Newer Energy Efficient (EX Type) require .5" from rear and sides to any obstruction. 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). They supply the required incoming electrical service to the buildings. The loads, which are calculated as part of the building electrical system design phase, are shown in the construction documents respective equipment schedules in VA or kVA. Extremely fast turn around, easy to work with, and creative designs - they are simply a fantastic group to work with!! All Rights Reserved. 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. North America | April 5, 2018. You may also hire a company to remove the debris or contact your local public works to see if they remove yard debris. But opting out of some of these cookies may affect your browsing experience. hbbd``b` $f F3 H0i .`RZ"APqeT @ C! {& In non-landscaped sites, pruned vegetation and wood are left in place to biodegrade. Therefore, it's advisable that you seek guidance on this matter from an engineer knowledgeable in seismic supports and the associated code requirements. They were very attentive to our needs, very detailed with their work, and met the needs of our timetable. It shall be the customers This was our second project and I knew exactly who I wanted to work with. Serious injuries and even fatalities have occurred when untrained individuals have done this work without the assistance of qualified professionals. An IVM program evaluates vegetation and determines the best methods for maintenance and tree removal to ensure reliable service. See my site logo at. Serious injury or death may result from climbing a tree and making direct contact with or coming too close to an energized line. These include the operation of fans, motors, thermal relays, and other auxiliary devices. Before specifying any additional tests, you should contact the manufacturer to find out what data it has accumulated from testing essentially duplicate units. 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. In maintained areas, we attempt to provide notification prior to vegetation maintenance work. The 18,688-seat FIU football stadium was designed with about 12 transformers as part of the electrical system distribution in order to supply general-use receptacles, small motors, and other loads in the stadium building structure and the attached field house building. If in doubt about clearances, do not hesitate to call the transformer manufacturer. Structurally speaking, it's generally wiser to place a transformer as close as possible to a column. The ESR Manual provides guidance and instructions pertaining to electrical service connections. %PDF-1.6 % 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. 2 0 obj Magazine: 3-Phase Padmount Transformer Concrete Foundation - Duke Energy. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". They gave us 6 logo ideas to start with. ;#Qs3s=*gi 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. Otherwise, they can be installed on open walls or steel columns or above suspended ceilings. Oil-filled transformers are constructed with the windings encased in an oil-tight tank filled with insulating mineral oil. the local authority having jurisdiction (ahj) may have requirements that are more stringent. If you see a downed line, immediately contact Duke Energy. 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. 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 If trees or limbs have fallen onto power lines, we will dispatch crews to clear the vegetation from power lines and equipment. 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. Click Here to see our Portfolio. Duke Energy does not prune trees for light levels or pattern. The format of the written authorization will depend upon the specific requested use of a Duke Energy right of way. These practices are approved by internationally recognized tree care associations and are referred to as Integrated Vegetation Management (IVM). Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. We do UNLIMITED REVISIONS until you are 110% satisfied with your logo. Consult the transformer diagrammatic nameplate for information on what tap must be used to correct for extra high or extra low incoming line voltage. 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 Also, it's a matter of cost. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. For linear load applications, transformers should be selected with lower core losses. hb```f eaak \6XBt+eNHPY0?P0dTh D>+30mg`T}n303c2bpa4%u`(00m] 9>b`28 *> %PDF-1.5 % 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. This is especially true if bronze or other type material is used for the nuts/bolts. We offer a 100% Satisfaction Guarantee. We believe it speaks for itself. 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. 820 0 obj <> endobj 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. These periodic mechanical movements create sound vibrations with a fundamental frequency of 120 Hz and harmonics derivatives of this fundamental. Box of 1 Unit Trade Account Log In Log In to view price Specifications Products specifications However, anyone is encouraged to report unsafe conditions. 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). down from each of the ends of the long sides. The cookie is used to store the user consent for the cookies in the category "Performance". Before your transformer is scheduled to be shipped to its designated site, it's important that you coordinate with the manufacturer what acceptance tests should be carried out. S=9X^&>``AT#l2} ppC_H. Most soils are able to withstand a bearing pressure of 2500 lbs/sq ft. WebRequirements 1) It shall be the contractor's responsibility to secure the Power Company's approval prior to applying for a permit. The harmonics resulting from nonsinusoidal currents generate additional losses and heating of the transformer coils, which reduce the transformer life expectancy. You also have the option to opt-out of these cookies. How To Cancel Simply Save Td, Dawn Anna Townsend Today, Articles D