US3644858A - Transformer having a nonmetallic casing - Google Patents

Transformer having a nonmetallic casing Download PDF

Info

Publication number
US3644858A
US3644858A US75915A US3644858DA US3644858A US 3644858 A US3644858 A US 3644858A US 75915 A US75915 A US 75915A US 3644858D A US3644858D A US 3644858DA US 3644858 A US3644858 A US 3644858A
Authority
US
United States
Prior art keywords
nonmetallic
casing
transformer
core
winding assembly
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.)
Expired - Lifetime
Application number
US75915A
Other languages
English (en)
Inventor
Dudley L Galloway
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Application granted granted Critical
Publication of US3644858A publication Critical patent/US3644858A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01F27/02—Casings

Definitions

  • Transformers used in underground electrical distribution systems are often subjected to an extremely corrosive environment.
  • the vaults in which the transformers are installed may be very damp and they often contain water.
  • the transformer may be at least partially submerged in water for extensive periods of time.
  • the environment surrounding a transformer in an underground electrical distribution system may be so corrosive that even the stainless steels are subjected to attack. Even if such steel could be made absolutely corrosionproof against all corrosion chemicals found in soil water, it would still have the disadvantage of higher cost.
  • the nonmetallic tank of the present invention wherein the nonmetallic tank comprises a tubular portion which is wound on a mandrel using nonmetallic material such as a filament wound glass fiber impregnated with a resin such as epoxy resin.
  • the tubular portion of the tank is provided with a nonmetallic bottom which is strong enough to resist stresses induced during handling of the tank.
  • This nonmetallic bottom member is keyed to the sidewalls of the tubular portion of the tank during the winding process to provide a fluidtight seal between the bottom of the tank and the sidewalls of the tubular portion of the tank.
  • This bottom member is made of epoxy laminate or molded glass epoxy, or other suitable reinforced plastic.
  • the tank is provided with a nonmetallic cover which may be cast from a resin such as epoxy resin.
  • a nonmetallic cover which may be cast from a resin such as epoxy resin.
  • Metallic inserts are cast into the cover member and the core-winding assembly is supported from these metallic inserts by metallic structural members connected between the inserts and the end frame of the core-winding assembly.
  • These metallic inserts are also provided with threaded holes for insertion of eye bolts for lifting the core-winding assembly without inducing undue stresses in the nonmetallic cover member. When the eye bolts are not required for lifting they are removed from the holes in the inserts in the nonmetallic cover and the holes are filled with nonmetallic plugs or screws.
  • This invention provides a transformer including a core-winding assembly wherein all of the metallic components of the transformer are totally enclosed within a nonmetallic, noncorrosive, housing or casing.
  • the nonmetallic cover member is sealed to the top of the tubular member of the housing or casing by means of a good sealant such as epoxy cement. This cement sealing the top of the casing to the top of the tubular member of the casing is strong enough to permit' lifting of the transformer with the eye bolts even when the transformer is filled with a coolant, such as oil.
  • FIG. 1 is a vertical sectional view of a transformer provided in accordance with this invention.
  • FIG. 2 is a sectional view taken along line IIII of FIG. 1;
  • FIG. 3 is a partial sectional view illustrating in detail a metallic insert in the insulating top member from which the core-winding assembly is supported;
  • FIG. 4 is a vertical sectional view of a second embodiment of the invention provided by this invention, illustrating a second arrangement for supporting the core-winding assembly from the top of the casing;
  • FIG. 5 is a schematic view illustrating how the tubular portions of the transformer casing with the bottom members installed may be nested for shipping or storing.
  • the transformer shown in FIG. 1 comprises a nonmetallic tank 10-.
  • the nonmetallic tank 10 includes a nonmetallic cylindrical or tubular portion 12, a nonmetallic bottom 14 which closes the bottom end of the tubular portion 12 and a nonmetallic top member 16 which closes the top of the tubular or cylindrical portion 12.
  • the tubular or cylindrical portion 12 of the tank 10 is made of nonmetallic material such as a filament wound glass fiber impregnated with a resin such as an epoxy resin.
  • the portion 12 is wound on a rotating mandrel from filamentary material such as glass fiber impregnated with epoxy resin.
  • the bottom portion 14 is also made from a nonmetallic material such as glass epoxy laminate or molded glass epoxy or other suitable reinforced plastic.
  • the bottom portion 14 has a flange portion 18 circumferentially about the bottom portion 14. This bottom portion 14 is placed on the mandrel when the cylindrical or tubular portion 12 is being wound and the flange portion 18 is keyed into the sidewalls of the tubular or cylindrical portion [2 as indicated at 20 to lock the bottom portion 14 to the sidewalls of the portion 12 and provide a fluidtight joint between the bottom portion 14 and the tubular or cylindrical portion 12.
  • the upper end of the tubular or cylindrical portion 12 of the casing is closed by the top member 16.
  • This top member 16 is formed of some suitable nonmetallic material such as epoxy resin or reinforced glass polyester resin.
  • the top member I6 is sealed to the top edges of the wall portions 12 of the tubular or cylindrical member 10 at 26 with a good grade of cement which has sufficient strength to lift the casing filled to a predetermined height, as indicated at 28, with fluid dielectric. A good grade of epoxy cement has been found to be satisfactory for making the seal at 26.
  • the top member 16 has cast therein during the manufacture of the top member 26 low voltage bushings 30 for bringing low-voltage conductors through the top member 16 and highvoltage bushings 32 for bringing high-voltage electrical conductors through the top member 16.
  • the top member 16 also has cast therein metallic inserts 34.
  • the metallic insert 34 extends entirely through the top member 16 and has an opening 31 entirely therethrough, see FIG. 3.
  • the metallic insert 34 has a threaded portion 36 on the underside of the cover member 16 for attaching the corewinding assembly to the top member 16 by means of a nut 37.
  • the opening 31 through the metallic member 34 is threaded on the inside as indicated at 35. This opening 31 is used for pulling a vacuum in the casing after the top 16 has been assembled thereto and for filling the casing with liquid dielectric 28 and then a threaded nonmetallic plug 33 is inserted into the opening 31 from above to close the opening 31 to atmosphere.
  • an eye bolt 38 For lifting the transformer an eye bolt 38, FIG.
  • I may be also screwed into the threads 35 of the opening 31 in the metallic member 34 after the closure plug 33 has been inserted.
  • the eyebolt 38 When the eyebolt 38 is not being used it is removed from the opening 31 and a screw threaded nonmetallic plug 40, as shown in FIG. 3, is inserted into the opening 31.
  • the insert member 34 is provided with flanges 25, 27 and 29 to assist in distributing stresses in the nonmetallic cover member 16.
  • the core-winding assembly comprises a laminated metallic core 42 having an end frame 44 attached thereto.
  • An electrical coil 41 comprising high-voltage windings and low-voltage windings is associated with the core 42.
  • a pair of metallic brackets 48 are attached to the end frame 44 of the core 42 and these brackets 48 are attached to the metallic insert 34 by means of a nut 37 which is threaded onto the lower threaded end 36 of the metallic insert 34.
  • blocks 56 of foam resin such as porous polyurethane resin, are placed under the corners of the core 42 as indicated in FIG. 2.
  • foam resin blocks 56 provide a cushion and partially distributes the support of the core-winding assembly from both the bottom member 14 of the casing and the top member 16.
  • the blocks 56 extend up the sidewalls of the casing 10, as indicated at 57, to prevent lateral movement of the core-winding assembly within the casing 10.
  • the blocks 56 are porous to permit saturation of the blocks 56 by the fluid detecting in the casing 10.
  • Low-voltage leads 57 connect through the low-voltage bushing means 30 and to the low-voltage coil of the winding 41.
  • High-voltage leads 59 connect through the high-voltage bushing 32 to the high-voltage winding of the winding 41.
  • FIG. 4 A second embodiment of the transformer as provided by this invention is illustrated in FIG. 4.
  • the core-winding assembly is supported from the nonmetallic top member 16 by two metallic struts or bracket members 48 which are connected to two separate spaced metallic inserts 34 in the nonmetallic cover member 16.
  • the top member 16 has two metallic inserts 34 therein for supporting the core 42- winding 41 assembly from the top members 16.
  • this embodiment is substantially identical to the embodiment shown in FIG. 1
  • the metallic inserts 34 of this embodiment are substantially identical to the inserts 34 described above for FIGS. 1 and 3 except that the metallic inserts 34 in FIG. 4 do not have but one stress reducing flange 27.
  • This embodiment using two widely spaced inserts 34 is believed to provide more stability against lateral movement of the corewinding assembly within the casing 10 in case the casing 10 is tilted or bumped.
  • the top member 16 is cemented to the cylindrical or tubular portion of the casing 10 at 26. This cement 26 is strong enough to lift the fluid dielectric 28 when eyebolts 38 are inserted into the metallic inserts 34 for lifting the transformer.
  • FIG. 5 illustrates a plurality of casings l0 nested when empty.
  • the slanting sides 12, of frustum shape, of the members permit nesting ofa plurality of casings 10 in a small space when being shipped or stored.
  • a transformer comprising a nonmetallic casing, said nonmetallic casing comprising a longitudinal tubular portion, a nonmetallic bottom portion closing one end of said tubular portion, said nonmetallic bottom portion having its periphery keyed in a circumferential groove in the inside wall of said longitudinal tubular portion, saidperiphery of said bottom portion being sealed in the groove in the inside wall of said longitudinal tubular portion to provide a gasketless fluidtight joint between said bottom portion and said longitudinal tubular portion of said casing, a nonmetallic top closing the other end of said longitudinal tubular portion, metallic insert means mounted in said nonmetallic top portion, a core-winding assembly positioned in said casing, and means connecting said core-winding assembly to said metallic insert means in said nonmetallic top portion to provide support of said core-winding means, said metallic insert means permitting lifting of said transformer by applying a lifting force to said metallic insert means without creating excessive stress concentrations in said nonmetallic top portion.
  • cushion means are provided between said core-winding assembly and said bottom portion of said casing to partially support said core-winding assembly from said bottom portion and reduce lateral movement of said core-winding assembly in said casing.
  • said metallic insert means comprises a plurality of spaced metallic members.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
US75915A 1970-09-28 1970-09-28 Transformer having a nonmetallic casing Expired - Lifetime US3644858A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7591570A 1970-09-28 1970-09-28

Publications (1)

Publication Number Publication Date
US3644858A true US3644858A (en) 1972-02-22

Family

ID=22128735

Family Applications (1)

Application Number Title Priority Date Filing Date
US75915A Expired - Lifetime US3644858A (en) 1970-09-28 1970-09-28 Transformer having a nonmetallic casing

Country Status (2)

Country Link
US (1) US3644858A (fr)
BE (2) BE773105A (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3788197A (en) * 1971-08-31 1974-01-29 B Bishop Fluid lift mechanism and underground housing
US3801727A (en) * 1972-09-25 1974-04-02 Rostone Corp Composite electrical transformer housing
US3936784A (en) * 1973-06-20 1976-02-03 Allmanna Svenska Elektriska Aktiebolaget Oil-filled apparatus with means for achieving pressure between parts thereof
US3979549A (en) * 1972-09-25 1976-09-07 Rostone Corporation Composite of metal and thermoset plastic
US3986080A (en) * 1971-03-09 1976-10-12 Matsushita Electric Industrial Co., Ltd. Oil-immersed type flyback transformer device
US4447796A (en) * 1982-04-05 1984-05-08 Mcgraw-Edison Company Self-adjusting spacer
US4985599A (en) * 1988-10-18 1991-01-15 Eggleston Robert E Transformer bushing cap
US6670879B2 (en) * 2001-07-27 2003-12-30 Edward Carter Transformer container
US20080041612A1 (en) * 2004-11-11 2008-02-21 Koninklijke Philips Electronics, N.V. Electrical High Field/High Voltage Unit and Method of Manufacturing Same
US20100065306A1 (en) * 2008-09-17 2010-03-18 General Electric Company Rupture resistant system
US20100065261A1 (en) * 2008-09-17 2010-03-18 General Electric Company System with directional pressure venting
US20100133284A1 (en) * 2008-09-17 2010-06-03 Green Michael S Rupture resistant tank system
WO2013182227A1 (fr) * 2012-06-05 2013-12-12 Siemens Aktiengesellschaft Cuve pour transformateurs ou bobines d'arrêt remplis de liquide
US20170117080A1 (en) * 2014-06-13 2017-04-27 Siemens Aktiengesellschaft Support device of an active part of a current transformer

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986080A (en) * 1971-03-09 1976-10-12 Matsushita Electric Industrial Co., Ltd. Oil-immersed type flyback transformer device
US3788197A (en) * 1971-08-31 1974-01-29 B Bishop Fluid lift mechanism and underground housing
US3801727A (en) * 1972-09-25 1974-04-02 Rostone Corp Composite electrical transformer housing
US3979549A (en) * 1972-09-25 1976-09-07 Rostone Corporation Composite of metal and thermoset plastic
US3936784A (en) * 1973-06-20 1976-02-03 Allmanna Svenska Elektriska Aktiebolaget Oil-filled apparatus with means for achieving pressure between parts thereof
US4447796A (en) * 1982-04-05 1984-05-08 Mcgraw-Edison Company Self-adjusting spacer
US4985599A (en) * 1988-10-18 1991-01-15 Eggleston Robert E Transformer bushing cap
US6670879B2 (en) * 2001-07-27 2003-12-30 Edward Carter Transformer container
US20080041612A1 (en) * 2004-11-11 2008-02-21 Koninklijke Philips Electronics, N.V. Electrical High Field/High Voltage Unit and Method of Manufacturing Same
US7964798B2 (en) * 2004-11-11 2011-06-21 Koninklijke Philips Electronics N.V. Electrical high field/high voltage unit and method of manufacturing same
US20100065306A1 (en) * 2008-09-17 2010-03-18 General Electric Company Rupture resistant system
US20100065261A1 (en) * 2008-09-17 2010-03-18 General Electric Company System with directional pressure venting
US20100133284A1 (en) * 2008-09-17 2010-06-03 Green Michael S Rupture resistant tank system
US8710946B2 (en) * 2008-09-17 2014-04-29 General Electric Company Rupture resistant system
US8717134B2 (en) * 2008-09-17 2014-05-06 General Electric Company System with directional pressure venting
US9159482B2 (en) * 2008-09-17 2015-10-13 General Electric Company Rupture resistant tank system
WO2013182227A1 (fr) * 2012-06-05 2013-12-12 Siemens Aktiengesellschaft Cuve pour transformateurs ou bobines d'arrêt remplis de liquide
US20170117080A1 (en) * 2014-06-13 2017-04-27 Siemens Aktiengesellschaft Support device of an active part of a current transformer
US10468173B2 (en) * 2014-06-13 2019-11-05 Siemens Aktiengesellschaft Support device of an active part of a current transformer

Also Published As

Publication number Publication date
BE773105A (fr) 1972-03-27
BE773162A (fr) 1972-03-28

Similar Documents

Publication Publication Date Title
US3644858A (en) Transformer having a nonmetallic casing
US3335903A (en) Plastic tanks
US3599134A (en) Nonmetallic corrosion-resistant enclosure for electrical apparatus
US3504319A (en) Electrical transformer
US3825148A (en) Hermetic sealing system for plastic tank and cover
US3132761A (en) Container for storing fluid medium under high pressure
US3025992A (en) Reinforced plastic storage tanks and method of making same
WO2012115902A2 (fr) Transformateur de réseau du type non immergé
US3158224A (en) Tubular structures
US2816947A (en) Transformer tank
CA1183916A (fr) Bobinages electriques pour hautes tensions, isoles a l'aide de produits renfermant sf.sub.6 gazeux
US3496502A (en) Means for enclosing transformers
EP2810285A1 (fr) Récipient sans renforcement pour appareil électromagnétique
US4689192A (en) Nuclear fusion reactor
US2085080A (en) Transformer case structure
US3219884A (en) Resin encased electrical apparatus
CN216903909U (zh) 一种立柱式户外低压配电箱
US3167732A (en) Encapsulated transformer
CN209880364U (zh) 阀出线装置和换流变压器
US20160189859A1 (en) Method Of Manufacturing An Electromagnetic Induction Device And An Electromagnetic Induction Device
JP2001166083A (ja) コンクリートキャスク
USRE27975E (en) Sealed power transformer
CN222636990U (zh) 一种可单独运输的1000kV变压器铁芯上夹件
JP3492148B2 (ja) 外鉄形変圧器
US2879488A (en) Clamping arrangement for cascade transformer