US3731244A - Transposition of insulating core windings - Google Patents
Transposition of insulating core windings Download PDFInfo
- Publication number
- US3731244A US3731244A US00268761A US3731244DA US3731244A US 3731244 A US3731244 A US 3731244A US 00268761 A US00268761 A US 00268761A US 3731244D A US3731244D A US 3731244DA US 3731244 A US3731244 A US 3731244A
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- United States
- Prior art keywords
- spiral
- tape
- conductor
- layers
- bundle
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- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
-
- 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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2847—Sheets; Strips
- H01F2027/2857—Coil formed from wound foil conductor
Definitions
- ABSTRACT A device for reducing the incidence of circulating currents within the coil structure of multiple-conductor windings of transformer/reactors of the insulating magnetic core type, by a transposition of the electrical connections between the several conductors of the multiple-conductor winding at the outer part of the winding after the core and coil assembly is completed.
- connections between analogous conductors of the multiple-conductor bundle are interchanged, the outermost conductor of one bundle being connected to the innermost conductor of the other bundle, second-outermost conductor of the one bundle being connected to the second-innermost conductor of the other bundle, and so forth.
- This invention relates to high-voltage insulating core type electrical induction apparatus and more particularly to a device for reducing power loss in such apparatus by employing multiple conductor bundle windings but avoiding difficult internal transpositions.
- high voltage d.c. equipment entails strong electric fields and high power a-c equipment has come to entail strong magnetic fields.
- Specialized techniques have been worked out for handling these strong electric fields in high voltage d.c. equipment: for example, megavolt accelerator apparatus employ hollow, rounded high voltage terminals and equipotential planes for controlling the electric field and shaping it uniformly.
- different specialized techniques have been worked out for handling the strong magnetic fields of high power a.c. equipment: for example, ferromagnetic material is used to form magnetic circuits in which elaborate steps are taken to minimize reluctance and eddy currents.
- ferromagnetic material is used to form magnetic circuits in which elaborate steps are taken to minimize reluctance and eddy currents.
- EHV which stands for extra high voltage and includes the range 345-765 kilovolts in overhead systems and 230 kilovolts and up in underground systems
- UHV which stands for ultra-high voltage and includes the voltages above 765 kilovolts now contemplated for overhead transmission
- the basic approach to the design of apparatus for coping with strong electric and magnetic fields is disclosed in the insulating-core patents of Van de Graaff, and more recently of Trump, et al. US. Pat. No. 3,684,991.
- the present invention is an improvement and refinement of these approaches in which insulating-core principles are applied to electromagnetic induction apparatus for use with EHV and UI-IV transmission lines for the absorption and storage of large quantities of electric charge associated with the capacitance of long transmission lines, or in the transfer of power from one voltage level to another in such large megavoltampere amounts.
- each tape is connected to a ferromagnetic core element, and the tape is spirally wound in a layer about said core element.
- the tape is spirally wound in a layer about said core element.
- two or more such tapes in each spiral layer are connected in parallel.
- the outer extremities of such tapes are not connected to each other, and in making the necessary connections between adjacent spiral layers, the outer extremity of each tape is connected only to the outer extremity of that adjacent tape which will minimize the electromotive force around the loops formed by the parallel paths between the inner extremities of the two tapes thus connected at their outer extremities.
- the electromotive force generated between the inner extremities of each thus-connected pair of tapes in a pair of adjacent spiral layers is substantially the same for all such tape-pairs.
- An individual conductor may be a conductive tape or band, and a conductor bundle may be n such tapes juxtaposed in front-to-back insulated relation and spirally wound about a core element to form substantially a disc-shaped coil section.
- all the conductors of the coil are electrically connected to the associated core element.
- the electromotive force in all conductors between adjacent core connection loci be substantially identical.
- the n conductors of a bundle each follow different paths with respect to the magnetic flux surrounding the core. As the spatial relation of the conductors to each other remains constant from turn to turn of the spiral section, this path-flux discrepancy between the various conductors of the bundle is augmented with every turn of the coil.
- the individual conductors may be related by their distances from that point to the core element (measured along a line through and perpendicular to the longitudinal core axis). One conductor will be closest to the core, one farthest, and others intermediate distances. If this measurement is performed at another location along the length of a wound bundle, the same conductor will be found to be closest (farthest) to the core as was determined in the first measurement, and,in general, the i'" closest conductor of the bundle at one location is the i" closest conductor at any location.
- This ordering relation of course cor" responds to the order in which the conductors are juxtaposed in front-to-back relationship when being spirally wound. Therefore, the conductors of the bundle may unambiguously be designated by terminology such as innermost, outermost, second-innermost, etc.
- any two individual conductors are related also in the following ways:
- the inner conductor has a greater instantaneous curvature than the outer conductor
- the length of the inner conductor from the core to the selected bundle location is less than the corresponding length of the outer conductor
- the inner conductor couples fewer lines of magnetic flux than does the outer conductor. Therefore, the flux-induced electromotive force will differ between these two conductors, thereby contributing to an EMF discrepancy between parallel conductive pathways between adjacent core connection loci.
- the present invention provides a construction and transposition which will tend to reduce the flux-induced EMF discrepancies among the individual conductors of the multiple conductor winding, minimize eddy and circulating current incidence and resultant power loss and thermal deterioration of insulation. While the efficiency of the invention will vary depending on the symmetries of the conductor-coil arrangements and the magnetic field outside the core in the vicinity of the coils, excellent results are achieved with the spirally wound disc-like coil sections suggested above and described more fully below in connection with the preferred embodiments.
- the transposition involves only the outer edge of the winding. This permits transposition after the assembly of the core and coil structure and allows the transposition to occur where magnetic flux is minimal or near-zero. Due to the nature of insulating core type induction devices, internal transpositions are effected only with great difficulty. Additionally, the transposition of the present invention does not add significantlv to theexpense or size of the coil or winding structure, and there is no interference with the surge and distribution method of the transformer/reactor. The invention works effectively with two, three, four, or a larger number of individual conductors within the bundle.
- the present invention accomplishes the above objectives by interchanging the electrical con-.
- FIG. 1 shows a diagrammatic view of a reactor of the insulating core type.
- FIG. 2 shows the manner in which coil sections are wound.
- FIG. 3 shows an alternate manner of winding adjacent coil sections associated with the same core element.
- FIGS. 4, 5, 6 indicate possible coil configurations and the scheme of electrical connections between adjacent coil sections.
- FIG. 1 shows an insulating core type reactor useful in handling high voltages.
- the magnetic circuit comprises a pair of end yokes 11 and 12 which couple a pair of segmented legs 13 and 14, each formed of a plurality of similar, coaxially aligned core elements such as 15 and 15', with insulating layers 18 separating the core elements.
- each core segment 15 Surrounding each core segment 15 is a coil winding comprising at least two coil sections 16 and 17. All conductors of each sections are electrically connected to their associated core segment, thereby establishing the electric potential level of the core segment at substantially that of the coil. Taken in totality, the coils of each leg 13, 14 provide multiple electric paths encircling the length of each leg. The manner in which the coil sections are arranged and electrically connected to each other and to the leg segments is described in more particularity in connection with succeeding figures.
- high voltage lead 19 is located at the center of the legs.
- Other leads are located near the ends of the legs or at the yokes.
- FIG. 2 shows a portion of core element 15 from FIG. 1 and a portion of its associated coil sections 16, 17.
- the coil section 16 is composed of a spiral winding of a conductor bundle containing n individual conductors 16,, 16 16,, labelled in ascending subscript order from the innermost (closest to the core) to the outermost (farthest from the core).
- Each conductor 16, through 16 is of the form of a tape or flexible band. While the invention is not limited to conductors of this nature, it has been found that such conductors have convenient electrical and mechanical properties.
- a conductor bundle comprises the n individual conductors aligned in a front-to-back relation, adjacent conductors being electrically separated by suitable insulating material.
- FIG. 3 shows two coil sections 36 and 37, associated with the same core element 35, wound simultaneously as a single unit 31.
- Coil section 36 consists of n conductors here labelled 36,, 36,, from innermost to outermost in the manner described on connection with FIG. 2, above.
- coil section 37 consists of n conductors 37,, 37,.
- the adjacent coil sections 36 and 37 are electrically connected in parallel, as described below in connection with FIG. 6.
- Multiple coil section units such as 31 may aid in enabling the electromagnetic apparatus to handle high current requirements.
- a desirable electromotive force equalization may be achieved by subdividing each tape conductor, such as 16,, l6, of FIG.
- FIG. 4 is a representation of a portion of the reactor of FIG. 1, illustrating details of a preferred coil configuration and electrical connections of the present invention.
- Each coil section 16, 17, and 17' is formed from a spiral winding of a two-conductor (20 and 21) bundle similar to that of FIG. 2.
- Coil sections 16 and 17, associated with the same core element 15, have all conductors connected 22 at the inside of the coil sections, to each other and to the core element.
- Adjacent coil sections 16 and 17, associated with adjacent core elements 15 and 15', respectively, are connected to each other at the outer part of the winding.
- connection 23 the two conductors of each winding are transposed, the outer conductor of the winding of each of coil sections 16 and 17' being connected to the inner conductor of the winding of the other coil section.
- Coil section 17, adjacent to high voltage lead 19 has both conductors of its winding connected to the high voltage lead at the outer part of the coil section.
- FIG. 6 shows another possible coil arrangement which can be used in connection with the present invention.
- each of the single coil sections 17, 17, 18 of FIG. 5 has been replaced by two similar coil sections 17a and 17b, 17'a and 17'b, 18a and 18b, respectively, connected in parallel.
- the transposition connection 25 is effected as illustrated by joining the outer conductors of coil sections 17 'a and 17 'b to the inner conductors of coil sections 16a and 16b, and joining the outer conductors of coil sections 16a and 16b to the inner conductors of coil sections 17'a and 17'b.
- High voltage high power apparatus comprising a magnetic circuit including a series of alternating thick layers of ferromagnetic, electrically conducting material and thin layers of electrically insulating material,
- each spiral layer comprising a plurality of lengths of means connecting the outer extremity of each tape to the outer extremity of a tape in an adjacent spiral layer
- said outer-extremity connecting means being such that the electromotive force generated between the inner extremities of each thus-connected pair of tapes in a pair of adjacent spiral layers is substantially the same for all such tape pairs.
- each spiral layer comprises n conductive tapes, n 2, juxtaposed in front-to-back insulated relation and spirally wound to form substantially a disc about said one ferromagnetic layer.
- each said conductive tape is subdivided along its width into a plurality of conductive parts connected in parallel.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
Description
Claims (6)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26876172A | 1972-07-03 | 1972-07-03 |
Publications (1)
Publication Number | Publication Date |
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US3731244A true US3731244A (en) | 1973-05-01 |
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Application Number | Title | Priority Date | Filing Date |
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US00268761A Expired - Lifetime US3731244A (en) | 1972-07-03 | 1972-07-03 | Transposition of insulating core windings |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0400112A1 (en) * | 1988-11-29 | 1990-12-05 | Electric Power Research Institute, Inc | High-voltage winding for core-form power transformers |
CN102938306A (en) * | 2012-09-05 | 2013-02-20 | 广东岭先技术投资企业(有限合伙) | Transformer modularization combined insulation structure |
WO2014079516A1 (en) * | 2012-11-26 | 2014-05-30 | Franc Zajc | Winding arrangement for inductive components and method for manufacturing a winding arrangement for inductive components |
CN102938306B (en) * | 2012-09-05 | 2016-11-30 | 马志刚 | Transformer modularized combined insulation structure |
CN107863229A (en) * | 2017-12-12 | 2018-03-30 | 中国西电电气股份有限公司 | A kind of transposition structure using width to more compound wire coils |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB255478A (en) * | 1925-07-18 | 1926-12-09 | Gen Electric | Method of winding electric transformer and the like coils |
AT220227B (en) * | 1958-11-21 | 1962-03-12 | Smit & Willem & Co Nv | Transformer winding |
US3684991A (en) * | 1971-07-12 | 1972-08-15 | High Voltage Power Corp | Electromagnetic induction apparatus |
-
1972
- 1972-07-03 US US00268761A patent/US3731244A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB255478A (en) * | 1925-07-18 | 1926-12-09 | Gen Electric | Method of winding electric transformer and the like coils |
AT220227B (en) * | 1958-11-21 | 1962-03-12 | Smit & Willem & Co Nv | Transformer winding |
US3684991A (en) * | 1971-07-12 | 1972-08-15 | High Voltage Power Corp | Electromagnetic induction apparatus |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0400112A1 (en) * | 1988-11-29 | 1990-12-05 | Electric Power Research Institute, Inc | High-voltage winding for core-form power transformers |
EP0400112A4 (en) * | 1988-11-29 | 1991-05-15 | Electric Power Research Institute, Inc | High-voltage winding for core-form power transformers |
CN102938306A (en) * | 2012-09-05 | 2013-02-20 | 广东岭先技术投资企业(有限合伙) | Transformer modularization combined insulation structure |
CN102938306B (en) * | 2012-09-05 | 2016-11-30 | 马志刚 | Transformer modularized combined insulation structure |
WO2014079516A1 (en) * | 2012-11-26 | 2014-05-30 | Franc Zajc | Winding arrangement for inductive components and method for manufacturing a winding arrangement for inductive components |
CN104937681A (en) * | 2012-11-26 | 2015-09-23 | 弗兰克·扎伊茨 | Winding arrangement for inductive components and method for manufacturing a winding arrangement for inductive components |
JP2015535658A (en) * | 2012-11-26 | 2015-12-14 | ザイツ, フランツZAJC, Franc | Inductive component winding structure and method of manufacturing inductive component winding structure |
US10424434B2 (en) | 2012-11-26 | 2019-09-24 | Franc Zajc | Winding arrangement for inductive components and method for manufacturing a winding arrangement for inductive components |
CN107863229A (en) * | 2017-12-12 | 2018-03-30 | 中国西电电气股份有限公司 | A kind of transposition structure using width to more compound wire coils |
CN107863229B (en) * | 2017-12-12 | 2019-11-08 | 中国西电电气股份有限公司 | A kind of transposition structure using width Xiang Duogen compound wire coil |
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AS | Assignment |
Owner name: MARINE MIDLAND BANK, N.A. Free format text: SECURITY INTEREST;ASSIGNOR:HIGH VOLTAGE ENGINEERING CORPORATION;REEL/FRAME:005009/0952 Effective date: 19880801 |
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Owner name: FIRST NATIONAL BANK OF BOSTON Free format text: SECURITY INTEREST;ASSIGNORS:COMFAB TECHNOLOGIES, INC.;HIGH VOLTAGE ENGINEERING CORPORATION;REEL/FRAME:005258/0013;SIGNING DATES FROM |
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Owner name: FLEET NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:HIGH VOLTAGE ENGINEERING CORPORATION, A MA CORPORATION;REEL/FRAME:005748/0283 Effective date: 19910607 |
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Owner name: SANWA BUSINESS CREDIT CORPORATION AS COLLATERAL AG Free format text: COLLATERAL ASSIGNMENT OF COPYRIGHTS, PATENTS, TRADEMARKS AND LICENSES;ASSIGNORS:HIGH VOLTAGE ENGINEERING CORPORATION;DATCON INSTRUMENT COMPANY;HALMAR ROBICON GROUP, INC.;AND OTHERS;REEL/FRAME:008013/0660 Effective date: 19960509 |