EP0191694A1 - Transformateur à haute tension et son procédé de fabrication - Google Patents

Transformateur à haute tension et son procédé de fabrication Download PDF

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Publication number
EP0191694A1
EP0191694A1 EP86400241A EP86400241A EP0191694A1 EP 0191694 A1 EP0191694 A1 EP 0191694A1 EP 86400241 A EP86400241 A EP 86400241A EP 86400241 A EP86400241 A EP 86400241A EP 0191694 A1 EP0191694 A1 EP 0191694A1
Authority
EP
European Patent Office
Prior art keywords
gas
windings
layer
gas permeable
electrical
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.)
Withdrawn
Application number
EP86400241A
Other languages
German (de)
English (en)
Inventor
Frank Martin
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.)
Schlumberger Canada Ltd
Original Assignee
Schlumberger Canada Ltd
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 Schlumberger Canada Ltd filed Critical Schlumberger Canada Ltd
Publication of EP0191694A1 publication Critical patent/EP0191694A1/fr
Withdrawn legal-status Critical Current

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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
    • H01F41/02—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 for manufacturing cores, coils, or magnets
    • H01F41/04—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 for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the present invention relates to electrical transformers and, more particularly, to an arrangement for encapsulating and impregnating the electrical windings of a transformer with a dielectric gas.
  • micro-arcing may occur between the windings or other surrounding materials which can cause short circuits and early failure of the transformer.
  • the foregoing arrangement has a serious disadvantage in that the resin encapsulation material, which is in direct contact with the transformer windings, can form voids or small sealed pockets around the windings into which the dielectric gas cannot reach. It has been found that these voids or pockets are sources of failure due to partial electrical discharges and arcing occurring between windings through these voids.
  • an electrical device having at least one set of electrical windings comprising at least one layer of a gas permeable and electrically insulating material disposed around the electrical windings; at least one layer of a gas impermeable and electrically insulating material disposed around the gas permeable material; and a dielectric gas disposed between the electrical windings and the gas impermeable layer and imgregnating the gas permeable layer and electrical windings.
  • Another aspect of the invention includes a method of insulating an electrical device having at least one set of electrical windings comprising the steps of: (a) wrapping at least one layer of a gas permeable and electrically insulating material about the electrical windings; (b) forming at least one layer of a gas impermeable and electrically insulating material about the gas permeable material; and (c) impregnating the gas permeable layer ana the windings with a dielectric gas.
  • FIG. 1 shows the secondary windings and associated components of a voltage transformer which is constructed in accordance with the principles of the present invention.
  • Secondary windings unit 1 comprises a generally rectangular coil form 3 formed from an insulator, such as cardboard or plastic, about which is wound first and second windings 5 and 7, separated by a spacer 9, formed from paper. Windings 5 and 7 are formed trom a continuous lengtn of electrically conductive material, such as wire, and are connected to external devices (not shown) through secondary terminals 11 and 13.
  • the gas permeable material used is an electrical grade crepe paper.
  • Such a material has a dielectric strength in the range of 150 volts per mil thickness and a low ash content.
  • Electrical grade crepe paper is preferred since it is inherently flexible and stretchable and thus will conform to any irregularities in the surface of the electrical windings and around any angles or bends that these windings make.
  • the thickness ana/or number of layers of the gas permeable material is empirically selected in accordance with the assumed maximum voltage which might be applied to the transformer windings. That is, the higher the voltage the transformer will be tested at, the thicker the crepe paper and/or the greater the number of layers employed.
  • the gas permeable material is not spirally wound about the electrical windings, but rather is applied as a single piece which does not substantially overlap itself at any given point. This reduces the weight and bulk of the gas permeable material used, as compared to prior art arrangements where such material is wound about the secondaries in a spiral fashion.
  • one or more of the layers of gas permeable material may be wrapped and/or spirally wound about the transformer windings to increase the resultant dielectric strength of the wrapping.
  • a barrier 17 is disposed around the completed secondary windings unit.
  • Barrier 17 is formed from an insulating material, such as kraft paper and serves to insulate the secondary windings unit from the primary windings which are subsequently formed around the secondary windings unit.
  • the primary windings unit 19 comprises a series of concentric electrical windings 21 wound about secondary windings unit 1.
  • Primary windings 21 are connected to external devices through primary terminals 23 and 25.
  • a layer of a gas impermeable, moldable material is formed around the assembled secondary and primary windings units 1 and 19.
  • the gas inpermeable material is an epoxy resin. This enables the assembled transformer to be encapsulated in a simple one-step resin casting process. Of course, other well-known types of plastic molding compounds could be used.
  • a particular advantage of such dielectric gases, and especially sulfur hexafluoride, is that they are "self-healing", i.e. even if disassociated due to the presence of an electrical arc, they quickly recombine and act to quench the arc and thereby prevent damage from occurring to the windings or adjacent structures.
  • gases also have the advantage of having a higher dielectric strength than a vacuum or air.
  • sulfur hexafluoride can have a dielectric strength of up to 10 times that of air and be approximately 100 times as effective as air in quenching an arc.
  • the gaseous dielectric 35 which is drawn into the interior of the encapsulated transformer using a vacuum impregnation technique, diffuses through the gas permeable protective layers 15 and 27 and through and around the primary and secondary windings 21, 5 and 7.
  • a gas permeable material such as crepe paper
  • crepe paper as a protective layer around the primary and secondary windings insures that the gas impermeable material which encapsulates the transformer will not penetrate between the primary or secondary windings, and thereby prevents the formation of voids or air pockets in the gas inpermeable material which heretofore have been known sources of failure, due to arcing between the windings through such voids.
  • the ccc p leted transformer includes a magnetic core unit 37, as shown in dashed outline in Figure 2.
  • Transformers constructed in accordance with the principles of the present invention show significantly better partial discharge characteristics (i.e. resistance to arcing between windings and associated components) than those not using a gas permeable protective layer. This results in a transformer which is less likely to fail under high applied voltages.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Transformer Cooling (AREA)
EP86400241A 1985-02-08 1986-02-05 Transformateur à haute tension et son procédé de fabrication Withdrawn EP0191694A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US699624 1976-06-25
US69962485A 1985-02-08 1985-02-08

Publications (1)

Publication Number Publication Date
EP0191694A1 true EP0191694A1 (fr) 1986-08-20

Family

ID=24810163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400241A Withdrawn EP0191694A1 (fr) 1985-02-08 1986-02-05 Transformateur à haute tension et son procédé de fabrication

Country Status (2)

Country Link
EP (1) EP0191694A1 (fr)
JP (1) JPS61245509A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859382A2 (fr) * 1997-02-10 1998-08-19 Schlumberger Industries Transformateur isolé par du gaz
CN112309677A (zh) * 2019-07-31 2021-02-02 台达电子企业管理（上海）有限公司 变压器结构及其制造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB778149A (en) * 1954-02-05 1957-07-03 Moser Glaser & Co Ag Improvements relating to the construction of electric transformers
US2893061A (en) * 1957-04-05 1959-07-07 Allis Chalmers Mfg Co Method for encapsulating electrical equipment
DE1072748B (de) * 1960-01-07 Siemens Schuckertwerke Aktiengesellschaft, Berlin und Erlangen Verfahren zum Einbetten einer elektrischen Wicklung in einen Gießharzkorper unter Vakuumeinwirkung
US3233311A (en) * 1961-06-05 1966-02-08 Gen Electric Method of making encapsulated coils
US3868766A (en) * 1973-08-31 1975-03-04 Ford Motor Co Method of forming an insulated coil for a dynamoelectric machine
US3905001A (en) * 1972-10-31 1975-09-09 Matsushita Electric Ind Co Ltd Oil-filled electrical instrument
JPS57170509A (en) * 1981-04-14 1982-10-20 Toshiba Corp Insulation process of dry-type transformer
JPS58166704A (ja) * 1982-03-29 1983-10-01 Hitachi Ltd レジンモ−ルドコイル及びその製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1072748B (de) * 1960-01-07 Siemens Schuckertwerke Aktiengesellschaft, Berlin und Erlangen Verfahren zum Einbetten einer elektrischen Wicklung in einen Gießharzkorper unter Vakuumeinwirkung
GB778149A (en) * 1954-02-05 1957-07-03 Moser Glaser & Co Ag Improvements relating to the construction of electric transformers
US2893061A (en) * 1957-04-05 1959-07-07 Allis Chalmers Mfg Co Method for encapsulating electrical equipment
US3233311A (en) * 1961-06-05 1966-02-08 Gen Electric Method of making encapsulated coils
US3905001A (en) * 1972-10-31 1975-09-09 Matsushita Electric Ind Co Ltd Oil-filled electrical instrument
US3868766A (en) * 1973-08-31 1975-03-04 Ford Motor Co Method of forming an insulated coil for a dynamoelectric machine
JPS57170509A (en) * 1981-04-14 1982-10-20 Toshiba Corp Insulation process of dry-type transformer
JPS58166704A (ja) * 1982-03-29 1983-10-01 Hitachi Ltd レジンモ−ルドコイル及びその製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 13 (E-153) [1158], 19th January 1983; & JP - A - 57 170 509 (TOKYO SHIBAURA DENKI K.K.) 20-10-1982 *
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 292 (E-219) [1437], 27th December 1983; & JP - A - 58 166 704 (HITACHI SEISAKUSHO K.K.) 01-10-1983 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0859382A2 (fr) * 1997-02-10 1998-08-19 Schlumberger Industries Transformateur isolé par du gaz
EP0859382A3 (fr) * 1997-02-10 1998-11-18 Schlumberger Industries Transformateur isolé par du gaz
CN112309677A (zh) * 2019-07-31 2021-02-02 台达电子企业管理（上海）有限公司 变压器结构及其制造方法
CN112309677B (zh) * 2019-07-31 2023-06-06 台达电子企业管理（上海）有限公司 变压器结构及其制造方法

Also Published As

Publication number Publication date
JPS61245509A (ja) 1986-10-31

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Inventor name: MARTIN, FRANK