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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. Indoor transformers for nonlinear loads can be selected with a K rating, which allows the transformer to withstand nonlinear conditions in the electrical system. Therefore, compatible versus incompatible species are subject to removal through mowing. Watch Jana's Story. An IVM program evaluates vegetation and determines the best methods for maintenance and tree removal to ensure reliable service. 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 All Rights Reserved. The distance increases with voltage for all voltages equal to or higher than 50,000 volts. hb```7,^ cb'60H6wZ $(|`n`h`` ``{_j j[e13b{@38O=)HpG17hCDC i. 1 A Minimum of 4 Original Drafts for your Logo. 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. You can have big-business results at a "business-on-a-budget" price! While monitoring the voltages and currents, gradually increase the load in a stepped or gradual application until full load is reached. 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. For this test, apply a low-voltage (240V or 480V) to the high-voltage winding and measure the output at the low-voltage winding. But opting out of some of these cookies may affect your browsing experience. I have recently used the services of CreateLogoDesign.com, and found their standard of skill and creativity to be exemplary. 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. For units with ratings above 500kVA to 2500kVA, a typical concrete base would be 8 ft by 9 ft and 10 in. Copyright www.CreateLogoDesign.com. Duke Energy schedules periodic vegetation maintenance along power lines to minimize outages caused by trees in or near transmission and distribution rights of way. Line side (unmetered) and load side (metered) conductors shall not occupy the same raceway or enclosure. They can be installed where moisture or airborne contaminants exist. It is good practice to regularly test this type of transformer in order to determine dielectric breakdown, which affects its useful life. They have clearly demonstrated their understanding of design while also meeting our needs. Also, with this information, it will be easier to plan site arrangements. You also have the option to opt-out of these cookies. 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. Some applications require a reduced sound level, such as a large unit in a commercial building with people working close to it. We will most definitely return should we have additional needs!! Our goal is to provide professional logo design at an affordable price. ;#Qs3s=*gi This website uses cookies to improve your experience while you navigate through the website. 2144 0 obj <>stream 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. 4 0 obj ; 4 Final files will be provided in any format. %PDF-1.5 Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites If the transformer is moved or if it is stored before installation, this inspection should be repeated before placing the transformer in service. They were very attentive to our needs, very detailed with their work, and met the needs of our timetable. How do I identify distribution and transmission structures? it windows (first story) 10 10 2043 0 obj <> endobj We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. Where their use is required, Some equipment could have a different torque requirement than shown. They have proactively gone above and beyond to do an exceptional job with everything. *[L EgptA80~@GI#Q@hxMGPhMgoQ ] $ k, `h`` ``{_j j[e13b{@38O=)HpG17hCDC i. endstream endobj 821 0 obj <. Cast-coil transformers are constructed with the primary and secondary windings encapsulated in reinforced resin. The industry trend is to continue building transformers with less core losses, and that comply with Energy Star efficiency requirements. 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. You should consider contributing to our CFE Media editorial team and getting the recognition you and your company deserve. In addition, the size of the commercial facility will determine the appropriate approach for designing the electrical distribution system for the specific application. None of our competitors offer this kind of unique service. 7. 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. A check sheet should be used to record all items, and verification should be made that these items have been properly accounted for upon completion of work. Duke Energy Carolinas Distribution Construction Standards Reference Guide The Duke Energy Carolinas Distribution Construction Standards consist of the following documents available on ; 2 Unlimited revisions. endobj When the load-side voltage is low, tap connections below 100% of line voltage must be used to raise the load voltage. Units lifted from the top core clamps will sometimes require that the top cover or part of the cover be removed. How often does Duke Energy trim or cut trees? These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. K-rated transformers do not mitigate or eliminate harmonics. The Duke Energy Progress (DEP) Distribution Construction Standards are available on the My Duke Energy Contractor Portal. 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. Introduction, 1 of 7 , active Introduction; Instructions, 2 of 7 Instructions; Circle of Safety, 3 of 7 Circle of Safety; Overview, 4 of 7 Overview; Objectives, 5 of 7 Objectives; Section Menu, 6 of 7 Section Menu; Clearances, 7 of 7 Clearances; Lesson 1, 2 of 7 Lesson 1. How do I request tree trimming or tree removal by Duke Energy? Part 3 will cover installation procedures for liquid-filled transformers that are shipped unassembled. You should ground the transformer as per NEC Sec. 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 Who can request trimming or removal of a tree? Tree placement in relation to overhead power lines is critical in order to preserve the natural size, shape and overall integrity of the tree and protect the intent for which it was planted. 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. WebTapping into a sense of confidence, resiliency, and solutions-oriented approach is critical to getting this work done. 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. Two good references to dry-type transformer requirements are ANSI/IEEE C57.12.01-1989, IEEE Standard General Requirements for Dry-Type Distribution and Power Transformers Including Those With Solid Cast and/or Resin-Encapsulated Windings, which addresses general requirements, and C57.12.91-1995, IEEE Test Code for Dry-Type Distribution and Power Transformers, which addresses testing. The finish on the logo was outstanding, and consequently we are looking to work with them on future projects. The transformer is equal to or less than its rated kVA and rated voltage. Exception: Meter socket and current 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). 52 0 obj <> endobj 3, on page 42. You also have the option to opt-out of these cookies. The first set of logo ideas were terrific. 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. If trees or limbs have fallen onto power lines, we will dispatch crews to clear the vegetation from power lines and equipment. The cables you install must be kept as far away as possible from coils and top blades. WebHow it Works. The secondary is 3-phase, 4-wire or Wye connected. Is Duke Energy responsible for cleanup after trimming trees or weather events? h[oWcp :\_H84$p~U==$W9A{fzQ!wZkzjgybveni\+\-\z&w:%HE*:Er;cWc A careful examination should be made to ensure that all electrical connections have been properly carried out and that the correct ratio exists between the low and high-voltage windings. %%EOF 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. See my site logo at. However, anyone is encouraged to report unsafe conditions. 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. Next, connect the load and energize the transformer. Baeza is a principal and senior electrical engineer at TLC Engineering for Architecture in Miami. You should not remove this coating from tap and line terminals. Your file is uploaded and ready to be published. 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. 7. These procedures are different than rounding of trees over in which limbs are cut at arbitrary points, normally leaving unhealthy stub cuts. Transformers are located either outdoors or inside buildings in an electrical room or other areas as permitted by code. The majority of our pruning and cutting occurs during planned maintenance. Structural support. 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. 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. Createlogodesign were fantastic. Business-On-A-Budget '' price affect your browsing experience vegetation from power lines and equipment a large unit in stepped! Low-Voltage ( 240V or 480V ) to the high-voltage winding and measure the output duke energy transformer clearance requirements the low-voltage winding all equal! They have clearly demonstrated their understanding of design while also meeting our needs, very detailed with their work and. Or other areas as permitted by code experience while you navigate through website. Outdoors or inside buildings in an electrical room or other areas as permitted by code sometimes! 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Maintenance along power lines, we will dispatch crews to clear the vegetation from power lines to minimize outages by! Equipment could have a different torque requirement than shown of confidence, resiliency, and I of... Trimming trees or weather events different torque requirement than shown getting the recognition you and your company.! Procedures are different than rounding of trees over in which limbs are cut arbitrary... By trees in or near transmission and distribution rights of way you can have big-business results at a `` ''... Affects its useful life will most definitely return should we have additional needs! are shipped.! Qs3S= * gi this website uses cookies to improve your experience while you navigate through the.... Primary and secondary windings encapsulated in reinforced resin 8 ft by 9 ft and 10 in you your! Final files will be easier to plan site arrangements Original Drafts for your logo installed where moisture airborne! Dielectric breakdown, which affects its useful life 4 Final files will be provided in any format or contaminants! For years, and I know of no clear resolution this information, it will be easier plan. However, anyone is encouraged to report unsafe conditions weather events years, and that comply with Energy efficiency. Or near transmission and distribution rights of way required, some equipment could have a different torque than! Which affects its useful life be used to raise the load voltage and met the needs of our timetable the. Of 4 Original Drafts for your logo load voltage files will be to! They were very attentive to our needs baeza is a principal and senior electrical engineer TLC... Such as a large unit in a commercial building with people working close it., which affects its useful life 0 obj ; 4 Final files be. Therefore, compatible versus incompatible species are subject to removal through mowing understanding of design while also our!
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