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. Who should trim or cut trees around power lines? 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. They are useful in areas with a corrosive or dirty atmosphere. 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. Transformers remain a fundamental component of electrical distribution systems. 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. When does Duke Energy trim a tree versus take down a tree? This may call for compromises regarding the length of the conductors going to and/or from the transformer. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
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. All Rights Reserved. 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). A separate secondary bus enclosure is required whenever the customer is installing. "7>^P*#e;dEH?7"\']Ec5>\(zx94|aX7NRc6~l}(} Also, with this information, it will be easier to plan site arrangements. All windings should be checked for continuity. We have a dedicated team of logo designers producing customized logo design solutions. ;w]S9
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300.2 METERED AND UNMETERED CONDUCTORS . He is a registered professional engineer with more than 29 years of experience in electrical engineering, project management, building design, and construction. 0
Although there are no moving parts in a transformer, the core does generate sound. Access to the Contractor Portal requires username and If our attempts to notify you are unsuccessful, work will proceed without further direct notification. 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. 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. transformers must be pre-approved by Duke Energy. 2067 0 obj
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We are extremely impressed with the work done and level of professionalism demonstrated by createlogodesign team. Caution is required when operating in parallel. The cookie is used to store the user consent for the cookies in the category "Performance". Some microprocessor-based electronic devices may not be able to withstand the voltage. We use professional contractors to apply herbicide by utilizing different methods including foliar, stump, stem and vine applications. endstream
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<. This cookie is set by GDPR Cookie Consent plugin. gz&E6;ZdEv;z~gx Both the voltages and currents should change in a similar fashion. WebTapping into a sense of confidence, resiliency, and solutions-oriented approach is critical to getting this work done. Sound levels associated with certain kVA ratings will vary depending upon the type of transformer and manufacturer. WebHow it Works. 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. Duke Energy schedules periodic vegetation maintenance along power lines to minimize outages caused by trees in or near transmission and distribution rights of way. Once the transformer has been located on its permanent site, a thorough final inspection should be made before any assembly is accomplished and the unit is energized. Who can request trimming or removal of a tree? Usually, additional testing means there will be an increase in transformer cost. Our Premiere Package includes all desirable "upgrades". Duke Energy Corporation. Our objective is to promote low-growing vegetation to minimize potential electric power interruptions, which also enhances wildlife habitat. After applying proper torque, you should wait a minute or so, and then re-tighten all bolts to the specified torque. 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? All Rights Reserved. 7. 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. Information on minimum wire bending space clearances at terminals for conductors is found in NEC Sec. You also have the option to opt-out of these cookies. 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. Create Logo Design offers professional and custom logo design services. With the exception of emergency situations, we attempt to ask permission of the property owner before taking down trees in maintained or landscaped areas. Duke Energy does not prune trees for light levels or pattern. How it Works. It is mandatory to procure user consent prior to running these cookies on your website. Only line clearance qualified personnel should perform tree work around or adjacent to power lines and electrical equipment. The tap setting should also be verified for the proper voltage. For new buildings, you should work with the structural engineers so that the transformer's placement is included in the building plans. 1 0 obj
The installation of conductors should be performed only by personnel qualified and experienced in high-voltage equipment. Our goal is to provide professional logo design at an affordable price. 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. When transformers are installed for parallel operation, their rated voltages, impedances, and turn ratios ideally should be the same and their phasor relationships identical. Examination should be made before removing it from the railroad car or truck, and, if any damage is evident or any indication of rough handling is visible, a claim should be filed with the carrier at once and the manufacturer notified. (3) Subway-LB transformer (see Table 8 on Page 7). All rainproof boxes are designed for outdoor use primarily to provide a degree of protection against all weather elements. Part 3 will cover installation procedures for liquid-filled transformers that are shipped unassembled. Why do you apply herbicides via helicopter? All products used by Duke Energy are registered by the Environmental Protection Agency and approved by appropriate state agencies. A protective plating or compound that prevents surface oxidation on the aluminum terminals is usually applied at the factory. Its purpose is to assist electrical contractors, engineers, architects, and manufacturers engaged in the installation of electrical service wiring and equipment. They can be installed where moisture or airborne contaminants exist. Before working on the connections make sure all safety precautions have been taken. Transformers are located either outdoors or inside buildings in an electrical room or other areas as permitted by code. Roles and Responsibilities Associated with Clearances, 1 of 8 Lifting from the base frame may require the use of a spreader bar to avoid damage to the enclosure panels. Blue Lake Rancheria. 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). 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. Another consideration for indoor distribution transformers is the type of load: linear or nonlinear.
If you have some doubt as to the load capability of the unit, contact the manufacturer. [CDATA[// >