US20130174497A1 - System and method for transformer repair - Google Patents
System and method for transformer repair Download PDFInfo
- Publication number
- US20130174497A1 US20130174497A1 US13/344,468 US201213344468A US2013174497A1 US 20130174497 A1 US20130174497 A1 US 20130174497A1 US 201213344468 A US201213344468 A US 201213344468A US 2013174497 A1 US2013174497 A1 US 2013174497A1
- Authority
- US
- United States
- Prior art keywords
- portable
- transformer
- building
- floor
- configuration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 claims description 28
- 238000001035 drying Methods 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 5
- 239000003063 flame retardant Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004378 air conditioning Methods 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 43
- 239000012071 phase Substances 0.000 description 22
- 238000012423 maintenance Methods 0.000 description 11
- 238000003860 storage Methods 0.000 description 6
- 229920003235 aromatic polyamide Polymers 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 241001354243 Corona Species 0.000 description 3
- 239000004760 aramid Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920002821 Modacrylic Polymers 0.000 description 1
- 229920001407 Modal (textile) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000582 polyisocyanurate Polymers 0.000 description 1
- 239000011495 polyisocyanurate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
- 229910052902 vermiculite Inorganic materials 0.000 description 1
- 239000010455 vermiculite Substances 0.000 description 1
- 235000019354 vermiculite Nutrition 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002982 water resistant material Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
- E04H5/04—Transformer houses; Substations or switchgear houses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Architecture (AREA)
- Manufacturing & Machinery (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
A system includes a portable transformer repair station that includes a portable building. The portable building includes a framework, a roof, and walls having a disassembled building configuration and an assembled building configuration. The portable building is configured to be transported in the disassembled building configuration. The portable building is configured to enclose a transformer repair space in the assembled building configuration. The portable transformer repair station also includes a portable floor having a disassembled floor configuration and an assembled floor configuration. The portable floor is configured to be transported in the disassembled floor configuration. The portable floor is configured to be disposed within the portable building in the assembled floor configuration. The portable transformer repair station also includes a portable oven configured to be disposed within the portable building. The portable oven is configured to remove moisture from a core and coils of a high voltage power transformer.
Description
- The disclosed subject matter relates to large power distribution transformers, such as transformers disposed at a power plant that generates and distributes electricity to a power grid. More specifically, the disclosed subject matter relates to repair of these large power distribution transformers.
- Transformers are devices that transfer electrical energy from one circuit to another through inductively coupled conductors, namely coils of the transformer. Transformers may be used to step up, or increase, or step down, or decrease, the voltage of an alternating current. In certain transformers, the coil consists of windings of wire wound around a ferromagnetic core. During use, transformers may be subject to maintenance issues, such as coronas, electrical breakdowns, internal arcing, and so forth. Thus, transformers may undergo regular maintenance to help prevent such maintenance issues. For example, some transformers may be rewound on a regular basis, which involves removing the windings from the cores of the transformer and installing new windings around the cores. Such transformer rewinds may be performed at a transformer repair shop remote from the facility where the transformer is installed. Thus, the entire transformer may be transported to the repair shop for the rewinding. Unfortunately, the transportation of large, high voltage power transformers may be expensive. For example, the transformers may weigh thousands of kilograms, and may be tens and hundreds of cubic meters in size. Thus, the transportation may require use of large semi-trailer trucks and/or railway carriers. In addition, the repair shop may be far from the transformer facility, thereby increasing the duration of the maintenance outage associated with the transformer rewind.
- Certain embodiments commensurate in scope with the originally claimed invention are summarized below. These embodiments are not intended to limit the scope of the claimed invention, but rather these embodiments are intended only to provide a brief summary of possible forms of the invention. Indeed, the invention may encompass a variety of forms that may be similar to or different from the embodiments set forth below.
- In a first embodiment, a system includes a portable transformer repair station. The portable transformer repair station includes a portable building. The portable building includes a framework, a roof, and walls having a disassembled building configuration and an assembled building configuration. The portable building is configured to be transported in the disassembled building configuration. The portable building is configured to enclose a transformer repair space in the assembled building configuration. The roof and the walls include at least one fabric sheet. The portable transformer repair station also includes a portable floor having a disassembled floor configuration and an assembled floor configuration. The portable floor is configured to be transported in the disassembled floor configuration. The portable floor is configured to be disposed within the portable building in the assembled floor configuration. The portable transformer repair station also includes a portable oven configured to be disposed within the portable building. The portable oven is configured to remove moisture from a core and coils of a high voltage power transformer.
- In a second embodiment, a system includes a portable transformer repair station. The portable transformer repair station includes a portable transformer enclosure that includes walls surrounding an interior chamber configured to house a core and coils of a high voltage power transformer. The portable transformer repair station also includes a moisture removal unit configured to remove moisture from the interior chamber and a temperature controller configured to adjust the moisture removal unit to reduce a moisture level below a threshold moisture level in the interior chamber to substantially dry the core and coils of the high voltage power transformer.
- In a third embodiment, a method includes transporting a portable transformer repair station to a local site surrounding a transformer site. The portable transformer repair station includes a portable building, a portable floor, and a portable oven. The method also includes assembling the portable floor at the local site, assembling the portable building at the local site, placing the portable oven inside the portable building, and drying a core and coils of a high voltage power transformer in the portable oven.
- These and other features, aspects, and advantages of the present invention will become better understood when the following detailed description is read with reference to the accompanying drawings in which like characters represent like parts throughout the drawings, wherein:
-
FIG. 1 is a perspective view of an embodiment of a high voltage power transformer; -
FIG. 2 is a schematic diagram of an embodiment of a portable transformer repair station; -
FIG. 3 is a perspective view of a portable building of an embodiment of a portable transformer repair station; -
FIG. 4 is a perspective view of a portable floor of an embodiment of a portable transformer repair station; -
FIG. 5 is a perspective view of a portable oven of an embodiment of a portable transformer repair station; -
FIG. 6 is a perspective view of a transformer rack of an embodiment of a portable transformer repair station; -
FIG. 7 is a side view of a group of trailers used to transport an embodiment of a portable transformer repair station; and -
FIG. 8 is a flowchart of a process for using a portable transformer repair station. - One or more specific embodiments of the present invention will be described below. In an effort to provide a concise description of these embodiments, all features of an actual implementation may not be described in the specification. It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another. Moreover, it should be appreciated that such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
- When introducing elements of various embodiments of the present invention, the articles “a,” “an,” “the,” and “said” are intended to mean that there are one or more of the elements. The terms “comprising,” “including,” and “having” are intended to be inclusive and mean that there may be additional elements other than the listed elements.
- As discussed in detail below, the disclosed embodiments provide systems and methods for repairing high voltage power transformers using a portable transformer repair station. High voltage power transformers may be used in the power distribution industry for stepping up or stepping down high voltage alternating currents (e.g., greater than approximately 35,000 volts). Again, the transformers may be used at power plants that generate and distribute electricity, e.g., tens, hundreds, or thousands of megawatts of electricity. Thus, the transformers are large and heavy, e.g., thousands of kilograms, and tens and hundreds of cubic meters in size. Occasionally, the coils of such transformers may be rewound to help prevent unscheduled maintenance outages caused by coronas, electrical breakdowns, internal arcing, and so forth. Prior to a scheduled maintenance outage, the portable transformer repair station is transported to a transformer facility and assembled. The transformer is then taken out of service, prepared, and disassembled in the portable transformer repair station to remove the coils from the core of the transformer. The coils may be shipped from the facility to a transformer repair shop to be rewound, thereby reducing transportation costs compared to shipping the entire transformer to the repair shop. The rewound coils may be shipped from the repair shop to the facility and installed on the core in the portable transformer repair station. Alternatively, new coils may be shipped from the repair shop and installed on the core in the portable transformer repair station, thereby reducing the duration of the scheduled maintenance outage. The core and coils are dried in the portable transformer repair station and installed in the transformer, which is returned to service. The portable transformer repair station may be disassembled and transported to another facility.
- The portable transformer repair station may include a portable building, a portable floor, and a portable oven. The portable building may include a framework, a roof, and walls having a disassembled building configuration and an assembled building configuration. In other words, the portable building is not a permanent structure and may be transported from one facility (e.g., power plant) to another. Thus, the portable building may be used to repair transformers in the assembled building configuration and transported in the disassembled building configuration. In the assembled building configuration, the portable building may enclose a transformer repair space where the transformer may be prepared, disassembled, dried, reassembled, and so forth. In addition, the roof and the walls of the portable building may include at least one fabric sheet. The portable floor may have a disassembled floor configuration and an assembled floor configuration. In other words, the portable floor is also not a permanent structure. Thus, the portable floor may be used in the portable building in the assembled floor configuration and transported in the disassembled floor configuration. The portable oven may be disposed in the portable building and used to remove moisture from the core and coils of the high voltage power transformer. In further embodiments, the portable transformer repair station may include a temperature controller that adjusts the portable oven to reduce a moisture level below a threshold moisture level to substantially dry the core and coils of the high voltage power transformer.
- Turning to the drawings,
FIG. 1 is a perspective view of a highvoltage power transformer 10. Specifically, the highvoltage power transformer 10 depicted inFIG. 1 may be a three phase distribution transformer. Thus, the core of thetransformer 10 may include a first windingleg 12, a second windingleg 14, and a third windingleg 16. Thetransformer 10 also includes anupper yoke 18 and alower yoke 20. In certain embodiments, the windinglegs lower yokes legs secondary windings - The conductive cabling used to form the
phase windings 22 may be non-insulated cabling. The use of non-insulated cabling necessitates the placement of an electrically-insulative material within the phase windings 22. More particularly, a solid, electrically-insulative material such as epoxy resin may be placed between adjacent turns, and between adjacent layers within the phase winding 22. The phase windings of oil-filled transformers are further insulated by oil (e.g., mineral oil) that surrounds the phase windings within such transformers. The placement of insulation between the adjacent turns and layers of the phase winding 22 is configured to prevent short-circuiting that would otherwise occur due to the differing electric potential between the adjacent layers and turns. The insulation is also configured to prevent short circuiting betweenadjacent phase windings 22, and between thephase windings 22 and adjacent conductive components. The solid insulative material is placed individually over each cable layer, and between adjacent turns in the particular layer, immediately after the layer has been wound. Hence, installation of the solid insulative material is integrated into the winding process for each phase winding 22. - During a rewind of the high
voltage power transformer 10, the upper andlower yokes legs phase windings 22 may be removed from the windinglegs phase windings 22 may be installed in the windinglegs lower yokes legs windings 22, yokes 18 and 20, andlegs voltage power transformer 10 back into service. Drying of thephase windings 22 prior to placing thetransformer 10 in service may help prevent internal arcing or coronas, for example. Several methods may be used to dry thephase windings 22 of thetransformer 10. For example, in hot air vacuum drying, hot air is circulated over thephase windings 22 followed by periods of vacuum. Use of periods of vacuum helps to remove additional moisture from the phase windings 22. In vapor phase drying, an evaporated solvent condenses on colder parts of thetransformer 10. The solvent is then removed along with any moisture. In sometransformers 10, low frequency heating may be used, in which a current at a lower frequency than the nominal current of thetransformer 10 is used to heat thephase windings 22 and drive off any moisture. Any of these methods, or other methods of drying transformer components, may be used in the portable transformer repair station described in detail below. -
FIG. 2 is a schematic diagram of a portabletransformer repair station 40 that may be used to dry the core and coils oftransformer 10 on-site at a power plant or other facility having one or more transformers 10 (e.g., 1 to 100 transformers). Although one arrangement of components of the portabletransformer repair station 40 is shown inFIG. 2 , other arrangements and configurations are possible as well. Specifically, the portabletransformer repair station 40 may include aportable building 42 that encloses the various components of the portabletransformer repair station 40 as discussed in detail below. For example, thebuilding 42 may include a framework supporting a fabric exterior, e.g., walls, ceiling, and/or roof. The framework may be erected first and then covered with the fabric exterior for the assembled configuration of thebuilding 42. A certain portion of the interior of theportable building 42 may be used as atransformer repair space 44, in which the preparation, disassembly, drying, and assembly of thetransformer 10 is performed. In addition, theportable building 42 covers aportable floor 46, which is described in detail below. For example, thefloor 46 may include one or more sections that fit together, stack on top of one another, and/or interlock with one another, wherein the sections may include cushioning, flame resistant, and/or water resistant materials. Furthermore, thefloor 46 eliminates the need for a permanent foundation, such as a concrete slab. Aportable oven 48 may be disposed within thetransformer repair space 44 and used to dry the core and coils of thetransformer 10. For example, thephase windings 22, windinglegs lower yokes transformer 10 may be placed in theportable oven 48 to be dried after a rewind. In certain embodiments, one ormore heaters 50 may be used to direct hot air into theportable oven 48 for drying of the core and coils of thetransformer 10. Theheaters 50 may be electric heaters, combustion-based heaters, or any other type of heater. For example, theheaters 50 use electrical resistance, combustion of a liquid or gas fuel, or any combination thereof, to generate the hot air (e.g., air greater than approximately 100 degrees Celsius). In addition, theheaters 50 may be portable heaters that are shipped together with the rest of the portabletransformer repair station 40. In certain embodiments, theportable building 42 may include one or more core storage racks 52, which may be used to store the windinglegs lower yokes transformer 10 when not being dried in theportable oven 48. In further embodiments, one or more heating ventilation and air conditioning (HVAC)units 54 may be disposed outside of theportable building 42 to provide heating or air conditioning to regulate a temperature and/or humidity within theportable building 42. As discussed in detail below, the various components of the portabletransformer repair station 40 may be transported to a transformer facility in a disassembled configuration on one or more trailers and assembled into an assembled configuration for drying of the core and coils of thetransformer 10. After drying of the core and coils oftransformer 10 is complete, the portabletransformer repair station 40 may be disassembled into the disassembled configuration and placed on the trailers to be transported to another facility. Thus, the portabletransformer repair station 40 is not a permanent structure. -
FIG. 3 is a perspective view of theportable building 42 in the assembled configuration. As shown inFIG. 3 , theportable building 42 may include afront side 70 and aback side 72. A roof andwalls 74 of theportable building 42 may be supported on afront support 76, aback support 78, and one or moreintermediate supports 80, which collectively may be referred to as a framework of theportable building 42. The roof andwalls 74 may be made from at least one fabric sheet. In certain embodiments, the roof andwalls 74 may be made from a flame retardant material (e.g., a cotton fabric impregnated with a flame retardant chemical; a vinyl and polynosic rayon blend; an aramid synthetic fiber; a meta-aramid and para-aramid fiber blend; a meta-aramid, para-aramid, and modacrylic fiber blend; an oxidized polyacrylonitrile and aramid fiber blend; or a combination thereof), a moisture resistant material (e.g., fluoropolymers, sulfonated polymers, polyamides, polyimides, cellulosic polymers, expanded polytetrafluoroethylene (ePTFE), or a combination thereof), and/or an ultraviolet light resistant material (e.g., poly(methyl methacrylate, polycarbonate, PTFE, polyethylene terephthalate, or a combination thereof), such as polyvinylchloride (PVC). In other embodiments, the roof andwalls 74 may be made from an electrically non-conductive, insulating, and/or static free material. In certain embodiments, the roof andwalls 74 may include two or more sheets, or layers, of fabric. In further embodiments, thesupports portable building 42 may include aroof hatch 82, which may be used for ventilation and/or access. In addition, theportable building 42 may include apersonnel door 84 and anequipment door 86 on thefront side 70. Thepersonnel door 84 may be used to enable personnel to enter and exit theportable building 42. Thelarger equipment door 86 may be used to move thetransformer 10 in and out of theportable building 42. For example, thetransformer 10 may be moved using a forklift or similar device. In addition, theportable building 42 may be defined by awidth 88 and alength 90. For example, thewidth 88 and/or thelength 90 may be between approximately 12 meters (m) to 24 m, 15 m to 21 m, or 16 m to 19 m. In addition, theportable building 42 may be defined by aheight 92. In certain embodiments, theheight 92 may be between approximately 9 m to 15 m, 11 m to 14 m, or 12 m to 13 m. Theequipment door 86 may also be defined by a width 94 and aheight 96. In certain embodiments, the width 94 and/or theheight 96 may be between approximately 3 m to 12 m, 4 m to 9 m, or 5 m to 8 m. In other embodiments, theportable building 42 may have different shapes, sizes, and/or configurations. In one embodiment, theportable building 42 may be obtained from Big Top Manufacturing of Perry, Fla. -
FIG. 4 is a perspective view of theportable floor 46 that may be used with theportable building 42. As illustrated inFIG. 4 , theportable floor 46 may include a plurality of floor segments, or portions, such as afirst portion 110 and asecond portion 112, which may be selectively assembled together and later disassembled. A plurality of theportions portable building 42. For example, thefloor 46 may include between approximately 25 to 65, to 55, or 35 to 45portions portable building 42. In certain embodiments, theportions upper cushioning material 114 and a lower supportingmaterial 116. For example, the surface of thecushioning material 114 may include one ormore traction nubs 117 to provide traction with personnel or vehicles moving in theportable building 42. The supportingmaterial 116 may include an interior of structural supports that helps reduce the weight of theportable floor 46 while providing sufficient strength. As shown inFIG. 4 , the first andsecond portions first portion 110 may include one or morefirst locking portions 118 disposed about a periphery of thecushioning material 114 of thefirst portion 110. Similarly, thesecond portion 112 may include a plurality ofsecond locking portions 120 disposed about a periphery of the supportingmaterial 116 of thesecond portion 112. Each of the first andsecond locking portions axis 122. Once aligned along theaxis 122, the first andsecond portions first locking portions 118 to engage thesecond locking portions 120. - In certain embodiments, the
cushioning material 114 of theportable floor 46 may be defined by athickness 124, and thestructural material 116 may be defined by athickness 126. In certain embodiments, thethicknesses 124 and/or 126 may be between approximately 10 centimeters (cm) to 12 cm, 8 cm to 14 cm, or 6 cm to 16 cm. Accordingly, theportable floor 46 may be defined by anoverall height 128, which may be approximately the sum of thethicknesses height 128 may be between approximately 12 cm and 36 cm, 16 cm to 28 cm, or 20 cm to 24 cm. As shown inFIG. 4 , the first andsecond portions overlap distance 130. In certain embodiments, theoverlap distance 130 may be between approximately 25 cm to 102 cm, 36 cm to 76 cm, or 46 cm to 66 cm. Thecushioning portion 114 may be defined by alength 132 and awidth 134. In certain embodiments, thelength 132 may be between approximately 4 m to 5 m, 3 m to 6 m, or 2 m to 7 m and thewidth 134 may be between approximately 2 m to 3 m, 1.5 m to 4 m, or 1 m to 5 m. Thestructural material 116 may have similar dimensions. In various embodiments, theportable floor 46 may be made from a material that provides strength, rigidity, and impact resistance, such as, but not limited to, high density polyethylene. In certain embodiments, an anti-static (static dissipative) additive may be incorporated into the material used for theportable floor 46. In other embodiments, theportable floor 46 may be made from a flame retardant material and/or a moisture resistant material. The first andsecond portions portable floor 46 may be taken apart and stacked for transport in the dissembled configuration. In one embodiment, theportable floor 46 may be obtained from Signature Fencing & Flooring Systems, LLC of New York, N.Y. -
FIG. 5 is a perspective view of theportable oven 48, or moisture removal unit, that may be placed in thetransformer repair space 44 of theportable building 42. As described above, the core and coils of thetransformer 10 may be placed in theportable oven 48 to remove moisture from thephase windings 22 and insulation of thetransformer 10. As with theportable building 42, theportable oven 48 may be easily transitioned between an assembled configuration and a disassembled configuration. As shown inFIG. 5 , theportable oven 48 includes afront side 150 and aback side 152. In addition, theportable oven 48 includeswalls 154 and aroof 156. Thewalls 154 and theroof 156 may be made from a metal, such as galvanized steel or aluminum, and may include a supporting framework. Thewalls 154 and theroof 156 may be made from a plurality of segments that may be attached together to erect theportable oven 48 into an assembled oven configuration and disassembled and stacked on top of one another to place theportable oven 48 into a disassembled oven configuration. In addition, one or more openings may be formed in thewalls 154 to enable hot air from theheaters 50 to enter theportable oven 48. In other embodiments, theportable oven 48 may also include a heat exchanger, an induced draft fan, a coalescing filter, or any combination thereof, to facilitate drying of the core and coils of thetransformer 10. Afirst personnel door 158 and asecond personnel door 160 may be included in thewalls 154 for personnel access. An equipment door 162 (e.g., a vertical sliding door) may be included in one or more of thewalls 154 to enable the core and coils of thetransformer 10 to be moved in and out of theportable oven 48. Theportable oven 48 may be defined by awidth 164 and alength 166. In certain embodiments, thewidth 164 may be between approximately 3 m to 8 m, 4 m to 7 m, or 5 m to 6 m. In other embodiments, thelength 166 may be between approximately 8 m to 15 m, 9 m to 14 m, or 10 m to 12 m. In addition, theportable oven 48 may be defined by aheight 168, which may be between approximately 4 m to 8 m, 5 m to 7 m, or 5.5 m to 6 m. Theequipment door 162 may be defined by awidth 170 and aheight 172. In certain embodiments, thewidth 170 and/orheight 172 may be between approximately 3 m to 11 m, 4 m to 9 m, or 5 m to 8m. In certain embodiments, thewalls 154 and/or theroof 156 may be insulated to help retain heat within theportable oven 48. For example, theportable oven 48 may be insulated with materials such as, but not limited to, polyisocyanurate, fiberglass, mineral wool, polystyrene, polyurethane, vermiculite, cellulose, or a combination thereof. In certain embodiments, theportable oven 48 may be placed upon theportable floor 46 or may include a separate floor. Theportable oven 48 may include one ormore sensors 174 to provide feedback regarding a temperature or humidity in theportable oven 48. In one embodiment, theportable oven 48 may be obtained from Kelly Group, Inc. of Fremont, Nebr. -
FIG. 6 is a perspective view of acore storage rack 52, or transformer rack, which may be used to store the cores of thetransformer 10. Specifically, thecore storage rack 52 includes arack 190 and apallet 192. Thepallet 192 may be configured to hold the windinglegs lower yokes transformer 10. Thepallet 192 may be coupled to therack 190 using one ormore brackets 194. Thebracket 194 may be attached to one or more vertical support legs 196 (e.g., two legs) of therack 190. Thevertical support legs 196 may be coupled to ahorizontal support base 198 that may be placed on theportable floor 46. Anupper support 200 may be used to couple two or more of thevertical support legs 196 together for stability of thecore storage rack 52. In addition, one or moreinclined support legs 202 may be coupled to thehorizontal support base 198 and theupper support 200 to provide additional stability for therack 190. In certain embodiments, acounterweight 204 may be placed on thehorizontal supports 198 to stabilize therack 190, e.g., to help prevent therack 190 from tipping over when the cores of thetransformer 10 are placed in thepallet 192. In certain embodiments, one ormore holes 206 may be formed in thevertical support legs 196 to enable thepallets 192 to be placed in different vertical positions along thevertical support legs 196. In further embodiments, therack 190 may accommodate two ormore pallets 192 at the same time. In one embodiment, thecore storage rack 52 may be obtained from Belcan Corporation of Cincinnati, Ohio. -
FIG. 7 is a side view of agroup 220 of trailers that may be used to transport the portabletransformer repair station 40 from one facility to another. As shown inFIG. 7 , thegroup 220 includes afirst trailer 222, asecond trailer 224, and athird trailer 226. In further embodiments, fewer or more trailers may be used to transport the portabletransformer repair station 40. A cargo area of thetrailers FIG. 7 may be defined by alength 228 and a height 230. In certain embodiments, thelength 228 may be between approximately 11 m to 18 m, 13 m to 16 m, or 14 m to 15 m, and the height 230 may be between approximately 2 m to 3 m, 2.4 m, to 2.8 m, or 2.5 m to 2.7 m. Thetrailers first trailer 222 may be configured to transport theportable building 42 and the core storage racks 52, thesecond trailer 224 may be configured to transport theportable oven 48 and theelectric heaters 50, and thethird trailer 226 may be configured to transport theportable floor 46 and theHVAC units 54. In other embodiments, the various components of the portabletransformer repair station 40 may be arranged differently on thetrailers trailers -
FIG. 8 is a flowchart of aprocess 240 that may be used to dry the core and coils of thetransformer 10 using the portabletransformer repair station 40. In afirst step 242, the portabletransformer repair station 40 is transported to a local site using thegroup 220 oftrailers transformer repair station 40 including, but not limited to, trucks, cars, vans, boats, trains, aircraft, and other vehicles. In asecond step 244, theportable floor 46 is assembled and laid out at the local site. For example, thefloor 46 may be placed on bare ground or on one or more sheets of a material (e.g., plywood), but generally thefloor 46 need not be placed on a permanent foundation (e.g., concrete slab). In athird step 246, theportable building 42 is assembled on top of theportable floor 46. In afourth step 248, theportable oven 48 is assembled and placed inside theportable building 42. In certain embodiments, theportable oven 48 is placed in thetransformer repair space 44 inside theportable building 42. In afifth step 250, the core and coils of thetransformer 10 are placed within theportable oven 48 to be dried using theheaters 50, for example. In certain embodiments, theportable oven 48 may include a temperature controller to adjust theheaters 50. For example, the temperature controller may be configured to maintain a threshold temperature inside theportable oven 48 based on feedback from the one ormore sensors 174 disposed in theportable oven 48. Maintenance of the temperature at or above the threshold, or level, may enable the core and coils of thetransformer 10 to dry within a specified period of time (e.g., two to three weeks). Once dry, the core and coils may be placed within thetransformer 10 to be placed back in service. The steps above may be performed in reverse order to disassemble the portabletransformer repair station 40 and place it on thegroup 220 oftrailers - For example, the
process 240 may be part of larger process, or procedure, for performing maintenance on largepower distribution transformers 10. First, the facility (e.g., power plant) may be surveyed to identify a suitable site (e.g., local site) for the portabletransformer repair station 40. The local site may be prepared (e.g., graded) if necessary. In addition, the local site may surround, or be adjacent to, a transformer site where thetransformer 10 is located. Next, steps 242, 244, and 246 of theprocess 240 may be performed to erect the portabletransformer repair station 40 at the local site. At this point or earlier, thetransformer 10 may be taken out of service. Next, thetransformer 10 may be prepared for maintenance. For example, fluids (e.g., oil) may be drained and certain components (e.g., radiators) removed from thetransformer 10. Next, the core (e.g., windinglegs lower yokes 18 and 20) and coils (e.g., phase windings 22) may be removed, or un-tanked, from thetransformer 10. The preparation and disassembly of thetransformer 10 may be performed elsewhere at the facility or in theportable building 42, if it is large enough. If not already in theportable building 42, the core and coils may be moved into theportable building 42 to be further dissembled. The coils may then be shipped to a transformer repair shop, which may be at the facility or remote from it, to be inspected and rewound. As the coils may be smaller and lighter than thetransformer 10, shipment of the coils may be less expensive, faster, and less complicated than shipment of theentire transformer 10 to the repair shop, or remote site. - After being rewound, the coils are returned to the facility. Alternatively, replacement coils may be shipped to the facility from the repair shop. The core and coils are reassembled in the
portable building 42 and step 250 of theprocess 240 may be performed to erect theportable oven 48, if not already completed earlier. The core and coils are dried in theportable oven 48, removed, adjusted (if needed), and taken out of theportable building 42 to be inserted, or re-tanked, into thetransformer 10. The re-tanking and subsequent steps may be performed in theportable building 42, if it is large enough. After re-tanking, the cover of thetransformer 10 is reattached and thetransformer 10 filled with oil. Vacuum processing may then be used to remove any remaining air and/or moisture from thetransformer 10. After testing, thetransformer 10 may be returned to service, and the portabletransformer repair station 40 disassembled and placed on thegroup 220 oftrailers transformer repair station 40 may reduce the cost and time associated with the rewind of thetransformer 10 and may avoid having to build permanent structures at the facility for tasks associated with transformer maintenance and/or repair. - This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.
Claims (20)
1. A system, comprising:
a portable transformer repair station, comprising:
a portable building comprising a framework, a roof, and walls having a disassembled building configuration and an assembled building configuration, wherein the portable building is configured to be transported in the disassembled building configuration, the portable building is configured to enclose a transformer repair space in the assembled building configuration, and the roof and the walls comprise at least one fabric sheet;
a portable floor having a disassembled floor configuration and an assembled floor configuration, wherein the portable floor is configured to be transported in the disassembled floor configuration, the portable floor is configured to be disposed within the portable building in the assembled floor configuration; and
a portable oven configured to be disposed within the portable building, wherein the portable oven is configured to remove moisture from a core and coils of a high voltage power transformer.
2. The system of claim 1 , wherein the at least one fabric sheet comprises a flame retardant material and a moisture resistant material.
3. The system of claim 1 , wherein the portable floor comprises a flame retardant material and a moisture resistant material.
4. The system of claim 1 , wherein the portable floor comprises a plurality of floor segments configured to selectively couple together.
5. The system of claim 4 , wherein each segment comprises a cushioning material and a plurality of structural supports.
6. The system of claim 1 , wherein the portable oven comprises a portable heater coupled to a portable transformer enclosure, and the portable transformer enclosure comprises insulated metal walls.
7. The system of claim 1 , wherein the portable oven comprises a heat source, at least one sensor, and a controller, wherein the controller is responsive to feedback from the at least one sensor to maintain a temperature level for the core and coils of the high voltage power transformer.
8. The system of claim 1 , comprising a portable heating and air conditioning unit configured to heat or air condition the transformer repair space.
9. The system of claim 1 , comprising a transformer rack configured to support core laminations of the high voltage power transformer.
10. The system of claim 1 , comprising at least one trailer or vehicle having a cargo area configured to transport the portable transformer repair station.
11. A system, comprising:
a portable transformer repair station, comprising:
a portable transformer enclosure comprising walls surrounding an interior chamber configured to house a core and coils of a high voltage power transformer;
a moisture removal unit configured to remove moisture from the interior chamber; and
a temperature controller configured to adjust the moisture removal unit to reduce a moisture level below a threshold moisture level in the interior chamber to substantially dry the core and coils of the high voltage power transformer.
12. The system of claim 11 , wherein the moisture removal unit comprises a heater, a heat exchanger, an induced draft fan, a coalescing filter, or a combination thereof.
13. The system of claim 11 , wherein the portable transformer enclosure comprises an oven, and the moisture removal unit comprises a heater.
14. The system of claim 13 , wherein the oven comprises a portable metal enclosure with a framework, a roof, and walls having a disassembled oven configuration and an assembled oven configuration, wherein the portable metal enclosure is configured to be transported in the disassembled oven configuration, and the portable metal enclosure is configured to house at least one coil of the high voltage power transformer in the assembled oven configuration.
15. The system of claim 11 , wherein the portable transformer repair station comprises a portable building with a framework, a roof, and walls having a disassembled building configuration and an assembled building configuration, wherein the portable building is configured to be transported in the disassembled building configuration, and the portable building is configured to house the portable transformer enclosure in a transformer repair space in the assembled building configuration.
16. The system of claim 11 , wherein the portable transformer repair station comprises a portable floor having a disassembled floor configuration and an assembled floor configuration, wherein the portable floor is configured to be transported in the disassembled floor configuration, and the portable floor is configured to support the portable transformer enclosure in the assembled floor configuration.
17. A method, comprising:
transporting a portable transformer repair station to a local site surrounding a transformer site, wherein the portable transformer repair station comprises a portable building, a portable floor, and a portable oven;
assembling the portable floor at the local site;
assembling the portable building at the local site;
placing the portable oven inside the portable building; and
drying a core and coils of a high voltage power transformer in the portable oven.
18. The method of claim 17 , wherein the portable floor comprises a plurality of floor segments, and the portable building comprises at least one fabric layer defining a wall or a roof.
19. The method of claim 17 , comprising rewinding the coils and subsequently drying the core and coils in the portable oven.
20. The method of claim 19 , comprising disassembling the coils from the core of the high voltage power transformer at the local site or the transformer site, receiving the coils without the core at a remote site away from the local site and the transformer site, rewinding the coils at the remote site, receiving the coils at the local site after the rewinding, reassembling the coils with the core of the high voltage power transformer at the local site, and drying the core and coils in the portable oven at the local site.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/344,468 US20130174497A1 (en) | 2012-01-05 | 2012-01-05 | System and method for transformer repair |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/344,468 US20130174497A1 (en) | 2012-01-05 | 2012-01-05 | System and method for transformer repair |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130174497A1 true US20130174497A1 (en) | 2013-07-11 |
Family
ID=48742928
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/344,468 Abandoned US20130174497A1 (en) | 2012-01-05 | 2012-01-05 | System and method for transformer repair |
Country Status (1)
Country | Link |
---|---|
US (1) | US20130174497A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104806049A (en) * | 2015-03-23 | 2015-07-29 | 国家电网公司 | Combined structure of prefabricated cabin type transformer substation with low cost |
CN104806050A (en) * | 2015-03-23 | 2015-07-29 | 国家电网公司 | Highly-fireproof integrated transformer substation prefabricated cabin structure |
WO2016073576A1 (en) * | 2014-11-04 | 2016-05-12 | SAHIN, Hakan | Electrical transformer systems and methods |
CN107369290A (en) * | 2017-08-03 | 2017-11-21 | 国网安徽省电力公司检修公司 | 1000kV extra-high-voltage alternating currents station job safety early warning system and method |
NL2018951B1 (en) * | 2017-05-19 | 2018-11-28 | Royal Smit Transf B V | Oil-cooled power transformer and power coil |
CN112837895A (en) * | 2021-01-07 | 2021-05-25 | 张忠磊 | Transformer convenient to overhaul |
-
2012
- 2012-01-05 US US13/344,468 patent/US20130174497A1/en not_active Abandoned
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016073576A1 (en) * | 2014-11-04 | 2016-05-12 | SAHIN, Hakan | Electrical transformer systems and methods |
CN104806049A (en) * | 2015-03-23 | 2015-07-29 | 国家电网公司 | Combined structure of prefabricated cabin type transformer substation with low cost |
CN104806050A (en) * | 2015-03-23 | 2015-07-29 | 国家电网公司 | Highly-fireproof integrated transformer substation prefabricated cabin structure |
WO2016150203A1 (en) * | 2015-03-23 | 2016-09-29 | 国家电网公司 | High fire resistance integrated transformer substation prefabricated cabin structure |
NL2018951B1 (en) * | 2017-05-19 | 2018-11-28 | Royal Smit Transf B V | Oil-cooled power transformer and power coil |
CN107369290A (en) * | 2017-08-03 | 2017-11-21 | 国网安徽省电力公司检修公司 | 1000kV extra-high-voltage alternating currents station job safety early warning system and method |
CN112837895A (en) * | 2021-01-07 | 2021-05-25 | 张忠磊 | Transformer convenient to overhaul |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20130174497A1 (en) | System and method for transformer repair | |
US8416042B2 (en) | Transformer system | |
US8085122B2 (en) | High voltage step-up dry power transformer and power supply unit comprising at least one such transformer | |
US20170085064A1 (en) | Local Electrical/Instrumentation Room | |
JP5776835B2 (en) | Electric equipment carrier | |
CN103688322A (en) | Dry-type transformer | |
CN104025216B (en) | High-tension transformer module | |
US20100002408A1 (en) | Hvdc filter | |
KR101290682B1 (en) | Transformer having cooling device | |
Song et al. | Status of design and R&D for the ITER feeder system procurement in China | |
CN203799823U (en) | Woven open hollow inductance coil | |
Lieurance et al. | Design and cost studies for small scale superconducting magnetic energy storage (SMES) systems | |
US11557428B2 (en) | Medium-frequency transformer with dry core | |
CN110741454B (en) | Insulating transformer | |
Lorin et al. | Transformer condition assessment: Methodologies and on-site repair solutions | |
CN105655108A (en) | Power transformer with magnetic core formed by threading and winding silicon strip and manufacturing method thereof | |
Schild et al. | Iseult/INUMAC 11.7-T MRI Assembly Status | |
Bellofatto | Advantages and challenges of modular solutions for electrical substations | |
Eklund et al. | Increase transformer reliability and availability from condition assessment to site repair | |
Ren et al. | Design of Inflatable Grading Ring for Field Test of UHV Equipment | |
Coletti et al. | The IGNITOR electrical pulsed power supply system | |
Lieurance et al. | Modular transportable superconducting magnetic energy systems | |
Marietta et al. | Modular Transportable Superconducting Magnetic Energy Systems | |
CN108557230A (en) | A kind of apparatus for placing and preparation method thereof with electrical integrated taiwan area complete set of equipments | |
CN107834391A (en) | Transformer capacitor blocking device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL ELECTRIC COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BROWN, JOHNATHAN CHRISTOPHER;ENGSTROM, JOHN MICHAEL;SNOWBALL, JERRY PAUL, JR.;AND OTHERS;SIGNING DATES FROM 20111027 TO 20111205;REEL/FRAME:027511/0641 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |