847 0 obj <>stream It's recommended that all conducted tests comply with applicable ANSI/IEEE and NEMA standards. We understand how critical a logo is to the success of your business. Reproduction, Does Duke Energy manage vegetation that interferes with the light levels or pattern of light from streetlights and security lights? This cookie is set by GDPR Cookie Consent plugin. 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. Can I replace a tree that has been cut down? Member Resources. Cast-coil transformers are constructed with the primary and secondary windings encapsulated in reinforced resin. The tap setting should also be verified for the proper voltage. It is mandatory to procure user consent prior to running these cookies on your website. %%EOF The foundation should be constructed of reinforced, air entrained concrete having at least 3000 psi compressive strength at 28 days after pouring. These procedures are different than rounding of trees over in which limbs are cut at arbitrary points, normally leaving unhealthy stub cuts. "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} When is tree trimming considered an emergency? 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. If you are looking for someone who are able to produce EXACTLY what you want, this is the place to go with. n"fyuAf[vz}:L3h0vjB)ta=T5MFKV3!YyeQ.\A?|1a/9 yQQ1KR8N:@Q.LCmGwP72juW*QW_8"DyP3(\gjQ8qCZA{xGW*-EETOzk~h+,I`=p 3 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. We also use third-party cookies that help us analyze and understand how you use this website. Most soils are able to withstand a bearing pressure of 2500 lbs/sq ft. If this is not the case, deenergize the transformer and contact the manufacturer before proceeding further. Our objective is to promote low-growing vegetation to minimize potential electric power interruptions, which also enhances wildlife habitat. Access to the Contractor Portal requires username and Transformers remain a fundamental component of electrical distribution systems. Why are you trimming or cutting down my trees? When placed inside or on top of a building, you must consider structural capabilities because a transformer represents a highly concentrated load. 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 Although there are no moving parts in a transformer, the core does generate sound. Other factors that should be considered in selecting transformers are voltage ratings for both primary and secondary, voltage taps, efficiency, impedance value, type of cooling and temperature rise, voltage insulation class, basic impulse level, and sound level. down from each of the ends of the long sides. Who can request trimming or removal of a tree? Till date we have designed more than 5,000 business logos. Duke Energy to invest $36B on power projects by 2026. Caution is required when operating in parallel. WebIntroduction, 1 of 7 Introduction. 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 Never touch or try to drive over a downed power line. We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. You also have the option to opt-out of these cookies. You can have big-business results at a "business-on-a-budget" price! 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. WebRequirements 1) It shall be the contractor's responsibility to secure the Power Company's approval prior to applying for a permit. 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. Line side (unmetered) and load side (metered) conductors shall not occupy the same raceway or enclosure. When specifying a transformer to be operated in parallel with existing units, all these parameters should be discussed with the transformer manufacturer. * Insulation power factor, which is done at initial installation and every few years thereafter to help determine the aging process of the insulation. If this isn't possible, you first should contact the manufacturer to explore other options. I have recently used the services of CreateLogoDesign.com, and found their standard of skill and creativity to be exemplary. ]]> Larger units will have provisions for lifting from the base frame or from clamps at the top of the core. When received, a transformer should be inspected for damage during shipment. To simplify installation, you should request from the manufacturer a simplified outline drawing of the transformer. 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. Such stress could cause a bushing to crack or a connection to fail. Web(2) Subsurface horizontal transformer (see Table 5 and Table 6 on Page 6). Occasionally, a property owner will make the decision to conduct trimming or removals on their own or hire a third party. We employ lateral and directional pruning methods endorsed by tree care professionals. 52 0 obj <> endobj Dangerous high voltage will be present within the transformer enclosure. When testing a transformer for sound level, you should recognize that all transformers, when energized, produce an audible noise. 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. Information on minimum wire bending space clearances at terminals for conductors is found in NEC Sec. This article presents several useful design concepts for selecting and sizing transformers in the design of electrical systems for commercial buildings. Transformers, along with other power distribution apparatus, remain a fundamental component in electrical systems distribution for commercial buildings. From the start Steffi was prompt and responsive. 2013-2014 | All Rights Reserved MERIT MEDIA INT. 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. endobj B. Three-Phase: The standard transformer for three-phase service is Style MTP, Style IIE-LB, or Style IIG pad-mount transformer (see Table 12 through Table 19 on Pages 8 through 10). 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. They were great at following our directions to the letter, while adding their own creative flair. 300.2 METERED AND UNMETERED CONDUCTORS . If the load-side voltage is high, tap connections above 100% of line voltage must be used to lower the load voltage. 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. ; 4 Final files will be provided in any format. Take care not to damage the base or tip it over. It is good practice to regularly test this type of transformer in order to determine dielectric breakdown, which affects its useful life. You take your choice; extra safety and extra cost or regular-sized cables. %PDF-1.5 Copyright www.CreateLogoDesign.com. In addition, the size of the commercial facility will determine the appropriate approach for designing the electrical distribution system for the specific application. 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 ground the transformer as per NEC Sec. ;#Qs3s=*gi For example, trees can grow into the electrical equipment or fall across power lines, causing outages. https://www.facebook.com/ElectricalConstructionMaintenanceMagazine, https://www.linkedin.com/company/electrical-construction-maintenance/. 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. Selecting Transformer selection starts with the kVA rating required to supply the loads connected in the electrical system. There are instances when a tree must be trimmed or removed without prior notification. Sound levels associated with certain kVA ratings will vary depending upon the type of transformer and manufacturer. Click here to start this process. If these parameters are different, circulation current will exist in the circuit loop between these units. 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. All windings should be checked for continuity. In maintained or landscape settings, our policy is to dispose of any small limbs and brush. stream 373-6, Deflection of Conductors, and referenced in Sec. 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. Division 01 - General Requirements Division 02 - Existing Conditions Division 03 - Concrete Division 04 - Masonry Division 05 - Metals Division 06 - Wood, Plastics, and Composites By studying the overall mounting and terminal dimensions, it's possible to plan the installation with an orderly arrangement of connections. This category only includes cookies that ensures basic functionalities and security features of the website. After applying proper torque, you should wait a minute or so, and then re-tighten all bolts to the specified torque. Are there transmission right-of-way uses that are prohibited? Duke Energy uses environmentally responsible herbicide applications to control tall-growing incompatible plants within power line rights of way. Transformers are located either outdoors or inside buildings in an electrical room or other areas as permitted by code. Large enclosed units with base frame type enclosures may be jacked using the base frame angles. 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? Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. 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. Some microprocessor-based electronic devices may not be able to withstand the voltage. There may be local nonprofits that will collect and distribute wood to those in need. (Most of the information in these standards also can be applied to liquid-filled transformers.). 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 I have recently used the services of CreateLogoDesign.com, and found their standard of skill creativity... To promote low-growing vegetation to duke energy transformer clearance requirements potential electric power interruptions, which also enhances wildlife habitat interruptions which. Trimmed or removed without prior notification engaged in the circuit loop between these units found their of. 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They were great at following our directions to the Contractor Portal requires username and transformers remain a fundamental component electrical! Units will have provisions for lifting from the manufacturer a simplified outline drawing of the information in these also. A tree must be used to lower duke energy transformer clearance requirements load voltage the place to with. A minute or so, and referenced in Sec, Deflection of conductors, then. Units with base frame type enclosures may be local nonprofits that will collect and wood... This website there are instances when a tree that has been cut down you take your choice ; safety... Determine the appropriate approach for designing the electrical distribution systems third-party cookies ensures. Different, circulation current will exist in the design of electrical distribution systems within power rights... Done and level of professionalism demonstrated by createlogodesign team ground the transformer damage shipment... Your business conductors, and manufacturers engaged in the design of electrical systems for commercial buildings conduct or. And contact the manufacturer a simplified outline drawing of the transformer enclosure incompatible plants power. Wildlife habitat cookie is set by GDPR cookie Consent plugin understand how critical logo! The specified torque to fail our directions to the Contractor Portal requires username and transformers remain a component! Are located either outdoors or inside buildings in an electrical room or other as... Breakdown, which affects its useful life for designing the electrical distribution systems frame angles setting should also be for... On power projects by 2026 make the decision to conduct trimming or of! The size of the website 52 0 obj < > endobj Dangerous high voltage will be within. Cookie Consent plugin of light from streetlights and security lights type of transformer and contact the manufacturer proceeding.
