CA1038464A - Transformer with foil conductors - Google Patents
Transformer with foil conductorsInfo
- Publication number
- CA1038464A CA1038464A CA225,356A CA225356A CA1038464A CA 1038464 A CA1038464 A CA 1038464A CA 225356 A CA225356 A CA 225356A CA 1038464 A CA1038464 A CA 1038464A
- Authority
- CA
- Canada
- Prior art keywords
- conductors
- foil
- coil
- foil conductors
- winding
- 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
Links
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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/323—Insulation between winding turns, between winding layers
-
- 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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Insulating Of Coils (AREA)
Abstract
ELECTRICAL INDUCTIVE APPARATUS
ABSTRACT OF THE DISCLOSURE
Core and coil assembly for distribution trans-formers. At least a portion of the coil is constructed of a plurality of metallic foil conductors which are bonded to a common piece of insulating material. The foil con-ductors are disposed in the coil to form coil sections which are axially displaced from each other. The insulating material extends between the coil sections to prevent rela-tive movement of adjacent coil sections. Each foil con-ductor is first bonded to the insulating material and then spirally wrapped to provide the coil structure. In one embodiment, an insulating collar is positioned between adjacent foil conductors for extra mechanical strength.
ABSTRACT OF THE DISCLOSURE
Core and coil assembly for distribution trans-formers. At least a portion of the coil is constructed of a plurality of metallic foil conductors which are bonded to a common piece of insulating material. The foil con-ductors are disposed in the coil to form coil sections which are axially displaced from each other. The insulating material extends between the coil sections to prevent rela-tive movement of adjacent coil sections. Each foil con-ductor is first bonded to the insulating material and then spirally wrapped to provide the coil structure. In one embodiment, an insulating collar is positioned between adjacent foil conductors for extra mechanical strength.
Description
BACKGROUND OF THE INVENTION
Field of the Invention:
This invention relates, in general, to electrical inductive apparatus and, more specifically, to distribution transformers having foil conductors.
Description of the Prior Art:
Distribution transformers which operate at rela-tively high voltages have coil structures which are suitable for construction from foil conductors. The physical integrity of a coil structure constructed w1th foil conductors has been found to be better than a corresponding winding structure constructed from strap conductors. Thls is due mainly to the fact that thin sheet or foil conductors can be supported over a larger surface area than relatively thick strap conductors. Thus, the ability of a transformer -- 1 -- ,!~i~- .
~ .
.
, .. .. , . ~ .. . .
~03846~
to withstand short-circuit stresses is enhanced by the use ~-of foil conductors.
In some high-voltage ~nding structures, the use of a single sheet of foil which has a width substantially equal to the axial length of the winding structure, is practical. Such transformers exhibit very good mechanical integrity. However, as the voltage between layers increases, ;~
the insulation between the layers must be increased suffi-ciently to provide the required dielectric properties. As a result thereof, the space factor of the winding structure becomes undesirable when a single foil conductor i9 used.
Using several foil conductors to form separate coil sections permits a reduction in insulating material and an improvement in the space factor. Windings and materials constructed in this manner are disclosed in U.S. patents 217,~66 issued on July 15, 1~79 to J. L. Le Conte, 2,9~0,~7~ issued on April 1~, 1961 to J. W. Tarbox, and 3,477,126 issued on November 11, ;
1969 to H. K. Price. ;
Winding arrangements used according to the prior art wherein multiple foil conductors are used in each layer are susceptible to destruction under short-circuit stresses.
Under such conditions, the foil conductors tend to move to the center of the winding structure. Thus, the foil con-ductors at each end of the winding structure tend to move toward each other and, if moved sufficiently, or if adjacent conductors come into contact with each other, the winding structure is damaged. Therefore, it is desirable, and it -is an object of this invention9 to provide a transformer -having a winding structure formed from a plurality of foil conductors which are suitably disposed within the winding structure to prevent axial movement thereof, and to provide ;~ -
Field of the Invention:
This invention relates, in general, to electrical inductive apparatus and, more specifically, to distribution transformers having foil conductors.
Description of the Prior Art:
Distribution transformers which operate at rela-tively high voltages have coil structures which are suitable for construction from foil conductors. The physical integrity of a coil structure constructed w1th foil conductors has been found to be better than a corresponding winding structure constructed from strap conductors. Thls is due mainly to the fact that thin sheet or foil conductors can be supported over a larger surface area than relatively thick strap conductors. Thus, the ability of a transformer -- 1 -- ,!~i~- .
~ .
.
, .. .. , . ~ .. . .
~03846~
to withstand short-circuit stresses is enhanced by the use ~-of foil conductors.
In some high-voltage ~nding structures, the use of a single sheet of foil which has a width substantially equal to the axial length of the winding structure, is practical. Such transformers exhibit very good mechanical integrity. However, as the voltage between layers increases, ;~
the insulation between the layers must be increased suffi-ciently to provide the required dielectric properties. As a result thereof, the space factor of the winding structure becomes undesirable when a single foil conductor i9 used.
Using several foil conductors to form separate coil sections permits a reduction in insulating material and an improvement in the space factor. Windings and materials constructed in this manner are disclosed in U.S. patents 217,~66 issued on July 15, 1~79 to J. L. Le Conte, 2,9~0,~7~ issued on April 1~, 1961 to J. W. Tarbox, and 3,477,126 issued on November 11, ;
1969 to H. K. Price. ;
Winding arrangements used according to the prior art wherein multiple foil conductors are used in each layer are susceptible to destruction under short-circuit stresses.
Under such conditions, the foil conductors tend to move to the center of the winding structure. Thus, the foil con-ductors at each end of the winding structure tend to move toward each other and, if moved sufficiently, or if adjacent conductors come into contact with each other, the winding structure is damaged. Therefore, it is desirable, and it -is an object of this invention9 to provide a transformer -having a winding structure formed from a plurality of foil conductors which are suitably disposed within the winding structure to prevent axial movement thereof, and to provide ;~ -
- 2 -- . , . ~ , . . . . .
45,066 , 46~ .
:. ...
a transformer wlnding structure which may be economically constructed to exhibit these desired characterlstlcs.
SUMMARY OF THE INVENTION
There are disclosed herein new and useful arrange-ments for constructing the winding structure of a dlstri-bution transformer. A plurality of foil conductors are bonded to a single sheet of lnsulating material. The ln-sulatlng and conductlng members are spirally wound around each other to form the desired wlnding structure. By bondlng the conducting foils to the lnsulating material, the construction of the wlnding is considerably simpllfied over construction techniques which require separate winding of each section of the wlnding. In addition, bonding the conductors to the insulating materlal prevents movement of the conductors durlng short-circuit stresses, In one embodiment Or the invention, insulating collars having sub-stantially the same thickness as the foil conductors are positioned between ad~acent foil conductors and bonded to the insulating material. This provides a solld insulating material located between the conductors and enhances the mechanical strength of the winding structure.
BRIEF DESCRIPTION OF THE DRAWING
Other advantages and uses of this inventlon will become more apparent when considered in view of the follow-ing detailed description and drawing, in which:
Figure 1 is a cut-away view of a distribution transformer constructed according to thls invention;
Fig. 2 is a cut-away view of the core and coll assembly shown in Fig. 1 and constructed according to thls lnvention;
. .: , - : -. - . :.
45,066 ~ ~
: ~, lQ38464 Flg. 3 is a vlew of the foil conductor arrangement '~
used in the core and coil assembly shown ~n Flg. 2;
Fig. 4 is a partial, sectional view o~ the core and coil asæembly shown in Fig. 2;
Fig. 5 is a partial, enlarged view of the struc-ture shown in Fig. 4 and constructed according to one embodiment of this invention; and, Fig. 6 is a partial, enlarged view Or the struc-ture shown generally in Fig. 4, but constructed according 10 to another embodiment of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
,Throughout the following description, similar reference characters refer to similar elements or members in all of the flgures of the drawing.
Referring now to the drawing, and to Fig. 1 in particular, there is shown a distribution transformer , constructed according to this invention. The transformer includes the tank 10, the cooling radiators 12, and the ~'';
tank cover 14. The high-voltage bushing 16 and the high-20 voltage lightning arrester 18 are mounted on the tank cover 14 and the tank 10, respectively. The spin-top type low-voltage bushing 20 and the low-voltage llghtning arrester 22 are mounted on the side of the tank 10. The p core and coil assembly 24 ls located within the transformer tank 10 and ls usually surrounded by a suitable cooling dlelectric, such as mineral oil. The core and coil assembly ' 24 includes the winding structure 26 and the magnetic core - ' structure 28. The leads 29 extend from the winding structure ,- -;
26 and are connected to the approprlate bushlngs, such as the bushings 16 and 20.
- 4 - ,~
~ ,'' 45,066 ~
~0384~4 Flgure 2 is a cut-away view of the core and coll assembly shown in Fig. 1. The winding structure 26 is dls-posed in lnductive relatlonship with the wound magnetic core 28 which consists of the core portions 30 and 32.
The winding s~ructure 26 includes the inner low-voltage windlng section 34, the high-voltage windlng section 35, ~
and the outer low-voltage winding section 36. Each section ~ -includes at least one conductor which is spirally positioned around the center portion of the magnetic core 28. The hlgh-voltage winding section 35 may be constructed from foil conductors or from strap conductors. me layer 38 of lnsulatlng material ls illustrated in a positlon which exposes the foil conductors 40 of the outer low-voltage winding sec-tlon 36.
Flgure 3 is a view illustrating the location ofthe foil conductors 40 on the insulating sheet 42 of the outer low-voltage wlnding sectlon 36. The inner low-voltage wlndlng section 34 ls constructed Or similarly positioned insulatlng and conducting members. The lnsulatlng sheet 42 ls constructed of a suitable material, such as kraft paper, and has a sufficlent thlckness to provide the desired dielectric strength between ad~acent turns of the foil conductors 40. The foil or sheet conductors 40 are sep-arated by the space 44 to prevent electrical conductlon between axially ad~acent foil conductors. In additlon, spaces 45 are provided by the extenslon of the insulatlng sheet 42 beyond the outer edges of the outslde foil con-ductors 40.
Figure 4 ls a partial, sectional view of the core and coll assembly 24 shown ln Fig. 2. The foil conductors . .
.
, 45,066 40 lllustrated in Fig. 4 represent conductors contalnedwithin the low-voltage winding section 34. The conductors 40 are separated from the magnetlc core 28 by the addltional lnsulatlng materlal 46. The foll conductors 40 positioned between the insulating sheets 48 and 50 provlde one con-ducting layer of the lnner low-voltage winding section 34.
Additional conductlng layers are provlded by spirally wrapplng the lnsulatlng sheet and the foil conductors 40 around the magnetic core 28. The winding sectlon formed thereby ls essentlally a three-section, foll-wound windlng.
Other numbers of sections may be used within the contem-platlon of this invention. The use of a single sheet of lnsulatlng material, such as the insulating sheets 48 and 50, havlng a wldth substantlally equal to the axial dlmen-slon of the windlng structure provldes sufficlent mechanlcal support between the coll sectlons to prevent damaging move-ment of the conductors when they are sub~ected to hlgh stress condltlons.
Flgure 5 ls an enlarged, partlal vlew of a foll conductor 40 attached to an insulating sheet 52. An adheslve material 54 ls located between the conductor 40 and the sheet 52 to provlde the desired bonding character- -lstlc~. The foil conductors 40 are first bonded to the , insulating sheet 52 by a sultable method and then the com-: . . .
poslte materlal conslstlng of the lnsulatlng sheet 52 and the foil conductors 40 bonded thereto are wrapped around a suitable axls to provide a splrally dlsposed windlng structure. , Flg. 6 ls a view lllustratlng an arrangement con- -structed accordlng to another embodiment of the invention.
.. . ~
:: ~
45,066 ':, ,'" ~ .' .. . .
~03~ui4 ' ' '~ ~ ' An insulating collar 56 is positioned between the foll conductors 40 and ls similarly bonded to the insulating ~-sheet 58 by the adhesive 60. The insulating collar provldes additional relnforcement o~ the foil conductors ~0 and prevents relative movement therebetween. The insulating collar 56 may be constructed of any sultable material, such --as kraft paper. In the embodiment shown, the thickness of the lnsulating collar 56 is substantially equal to the thickness of the conductors 40.
The unlque conductor arrangement and construction of the winding disclosed herein permits relatively easy construction of a foll-wound transformer. The foil conductors are bonded in th`e proper positions on the insulating sheet and then the entire conductor-insulation-adhesive structure is spirally wound to form the winding. A magnetic core is then placed into the winding. Since the conductors are fixed with respect to each other, the axial position of each conductor need not be controlled separately durlng the winding process. For example, in a three-section winding, ;~
at least three axial alignments are required during construc-tion of the winding according to the prior art compared to only one axial alignment when constructed according to this ~ ~ -invention.
In addition, bonding the insulating and conducting materials together permits the constructlon of a transformer which has less insulating material than prior art transform-ers, even with only one conductor. With normal winding techniques, the insulating material must have a greater thickness than that required for sufficient electrical strength in order to provide sufficient mechanical strength - - . . . ~: :
~ 45,066 ~,Q38464 durlng the winding process. Due to the lncreased strength Or the bonded insulating and conducting materlals, the thickness Or the insulating material may be Just surriclent to provide the desired electrical properties without caus-ing dif~iculty due to tearlng during the winding operation.
Slnce numerous changes may be made in the above described apparatus, and slnce different embodiments of the invention may be made without departing from the spirit thereof, it is intended that all of the matter contained in the foregoing descriptlon, or shown in the accompanying drawing, shall be interpreted as illustrative rather than limiting.
. .
'~" .
,.; ' ':
, ~
,-.' '' ~ .
'~
45,066 , 46~ .
:. ...
a transformer wlnding structure which may be economically constructed to exhibit these desired characterlstlcs.
SUMMARY OF THE INVENTION
There are disclosed herein new and useful arrange-ments for constructing the winding structure of a dlstri-bution transformer. A plurality of foil conductors are bonded to a single sheet of lnsulating material. The ln-sulatlng and conductlng members are spirally wound around each other to form the desired wlnding structure. By bondlng the conducting foils to the lnsulating material, the construction of the wlnding is considerably simpllfied over construction techniques which require separate winding of each section of the wlnding. In addition, bonding the conductors to the insulating materlal prevents movement of the conductors durlng short-circuit stresses, In one embodiment Or the invention, insulating collars having sub-stantially the same thickness as the foil conductors are positioned between ad~acent foil conductors and bonded to the insulating material. This provides a solld insulating material located between the conductors and enhances the mechanical strength of the winding structure.
BRIEF DESCRIPTION OF THE DRAWING
Other advantages and uses of this inventlon will become more apparent when considered in view of the follow-ing detailed description and drawing, in which:
Figure 1 is a cut-away view of a distribution transformer constructed according to thls invention;
Fig. 2 is a cut-away view of the core and coll assembly shown in Fig. 1 and constructed according to thls lnvention;
. .: , - : -. - . :.
45,066 ~ ~
: ~, lQ38464 Flg. 3 is a vlew of the foil conductor arrangement '~
used in the core and coil assembly shown ~n Flg. 2;
Fig. 4 is a partial, sectional view o~ the core and coil asæembly shown in Fig. 2;
Fig. 5 is a partial, enlarged view of the struc-ture shown in Fig. 4 and constructed according to one embodiment of this invention; and, Fig. 6 is a partial, enlarged view Or the struc-ture shown generally in Fig. 4, but constructed according 10 to another embodiment of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
,Throughout the following description, similar reference characters refer to similar elements or members in all of the flgures of the drawing.
Referring now to the drawing, and to Fig. 1 in particular, there is shown a distribution transformer , constructed according to this invention. The transformer includes the tank 10, the cooling radiators 12, and the ~'';
tank cover 14. The high-voltage bushing 16 and the high-20 voltage lightning arrester 18 are mounted on the tank cover 14 and the tank 10, respectively. The spin-top type low-voltage bushing 20 and the low-voltage llghtning arrester 22 are mounted on the side of the tank 10. The p core and coil assembly 24 ls located within the transformer tank 10 and ls usually surrounded by a suitable cooling dlelectric, such as mineral oil. The core and coil assembly ' 24 includes the winding structure 26 and the magnetic core - ' structure 28. The leads 29 extend from the winding structure ,- -;
26 and are connected to the approprlate bushlngs, such as the bushings 16 and 20.
- 4 - ,~
~ ,'' 45,066 ~
~0384~4 Flgure 2 is a cut-away view of the core and coll assembly shown in Fig. 1. The winding structure 26 is dls-posed in lnductive relatlonship with the wound magnetic core 28 which consists of the core portions 30 and 32.
The winding s~ructure 26 includes the inner low-voltage windlng section 34, the high-voltage windlng section 35, ~
and the outer low-voltage winding section 36. Each section ~ -includes at least one conductor which is spirally positioned around the center portion of the magnetic core 28. The hlgh-voltage winding section 35 may be constructed from foil conductors or from strap conductors. me layer 38 of lnsulatlng material ls illustrated in a positlon which exposes the foil conductors 40 of the outer low-voltage winding sec-tlon 36.
Flgure 3 is a view illustrating the location ofthe foil conductors 40 on the insulating sheet 42 of the outer low-voltage wlnding sectlon 36. The inner low-voltage wlndlng section 34 ls constructed Or similarly positioned insulatlng and conducting members. The lnsulatlng sheet 42 ls constructed of a suitable material, such as kraft paper, and has a sufficlent thlckness to provide the desired dielectric strength between ad~acent turns of the foil conductors 40. The foil or sheet conductors 40 are sep-arated by the space 44 to prevent electrical conductlon between axially ad~acent foil conductors. In additlon, spaces 45 are provided by the extenslon of the insulatlng sheet 42 beyond the outer edges of the outslde foil con-ductors 40.
Figure 4 ls a partial, sectional view of the core and coll assembly 24 shown ln Fig. 2. The foil conductors . .
.
, 45,066 40 lllustrated in Fig. 4 represent conductors contalnedwithin the low-voltage winding section 34. The conductors 40 are separated from the magnetlc core 28 by the addltional lnsulatlng materlal 46. The foll conductors 40 positioned between the insulating sheets 48 and 50 provlde one con-ducting layer of the lnner low-voltage winding section 34.
Additional conductlng layers are provlded by spirally wrapplng the lnsulatlng sheet and the foil conductors 40 around the magnetic core 28. The winding sectlon formed thereby ls essentlally a three-section, foll-wound windlng.
Other numbers of sections may be used within the contem-platlon of this invention. The use of a single sheet of lnsulatlng material, such as the insulating sheets 48 and 50, havlng a wldth substantlally equal to the axial dlmen-slon of the windlng structure provldes sufficlent mechanlcal support between the coll sectlons to prevent damaging move-ment of the conductors when they are sub~ected to hlgh stress condltlons.
Flgure 5 ls an enlarged, partlal vlew of a foll conductor 40 attached to an insulating sheet 52. An adheslve material 54 ls located between the conductor 40 and the sheet 52 to provlde the desired bonding character- -lstlc~. The foil conductors 40 are first bonded to the , insulating sheet 52 by a sultable method and then the com-: . . .
poslte materlal conslstlng of the lnsulatlng sheet 52 and the foil conductors 40 bonded thereto are wrapped around a suitable axls to provide a splrally dlsposed windlng structure. , Flg. 6 ls a view lllustratlng an arrangement con- -structed accordlng to another embodiment of the invention.
.. . ~
:: ~
45,066 ':, ,'" ~ .' .. . .
~03~ui4 ' ' '~ ~ ' An insulating collar 56 is positioned between the foll conductors 40 and ls similarly bonded to the insulating ~-sheet 58 by the adhesive 60. The insulating collar provldes additional relnforcement o~ the foil conductors ~0 and prevents relative movement therebetween. The insulating collar 56 may be constructed of any sultable material, such --as kraft paper. In the embodiment shown, the thickness of the lnsulating collar 56 is substantially equal to the thickness of the conductors 40.
The unlque conductor arrangement and construction of the winding disclosed herein permits relatively easy construction of a foll-wound transformer. The foil conductors are bonded in th`e proper positions on the insulating sheet and then the entire conductor-insulation-adhesive structure is spirally wound to form the winding. A magnetic core is then placed into the winding. Since the conductors are fixed with respect to each other, the axial position of each conductor need not be controlled separately durlng the winding process. For example, in a three-section winding, ;~
at least three axial alignments are required during construc-tion of the winding according to the prior art compared to only one axial alignment when constructed according to this ~ ~ -invention.
In addition, bonding the insulating and conducting materials together permits the constructlon of a transformer which has less insulating material than prior art transform-ers, even with only one conductor. With normal winding techniques, the insulating material must have a greater thickness than that required for sufficient electrical strength in order to provide sufficient mechanical strength - - . . . ~: :
~ 45,066 ~,Q38464 durlng the winding process. Due to the lncreased strength Or the bonded insulating and conducting materlals, the thickness Or the insulating material may be Just surriclent to provide the desired electrical properties without caus-ing dif~iculty due to tearlng during the winding operation.
Slnce numerous changes may be made in the above described apparatus, and slnce different embodiments of the invention may be made without departing from the spirit thereof, it is intended that all of the matter contained in the foregoing descriptlon, or shown in the accompanying drawing, shall be interpreted as illustrative rather than limiting.
. .
'~" .
,.; ' ':
, ~
,-.' '' ~ .
'~
Claims
1. A transformer comprising:
a magnetic core;
a primary winding disposed in inductive relationship with said magnetic core;
a secondary winding having a plurality of conducting layers disposed in inductive relationship with the magnetic core, with each of said conducting layers comprising at least two metallic foil conductors which are bonded to a common layer of insulating material; and, an insulating member positioned between the foil conductors, with said insulating member having substantially the same radial thickness as the foil conductors.
a magnetic core;
a primary winding disposed in inductive relationship with said magnetic core;
a secondary winding having a plurality of conducting layers disposed in inductive relationship with the magnetic core, with each of said conducting layers comprising at least two metallic foil conductors which are bonded to a common layer of insulating material; and, an insulating member positioned between the foil conductors, with said insulating member having substantially the same radial thickness as the foil conductors.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US467756A US3891955A (en) | 1974-05-07 | 1974-05-07 | Electrical inductive apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1038464A true CA1038464A (en) | 1978-09-12 |
Family
ID=23857044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA225,356A Expired CA1038464A (en) | 1974-05-07 | 1975-04-24 | Transformer with foil conductors |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3891955A (en) |
| CA (1) | CA1038464A (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4160224A (en) * | 1977-05-11 | 1979-07-03 | Owen D W | Transformer |
| US4255734A (en) * | 1978-04-03 | 1981-03-10 | Owen D W | Transformer with tapped subwindings |
| US4249229A (en) * | 1978-08-28 | 1981-02-03 | Litton Systems, Inc. | Transformer having novel multiple winding and support structure and method of making same |
| USRE31704E (en) * | 1978-08-28 | 1984-10-09 | Litton Systems, Inc. | Transformer having novel multiple winding and support structure and method of making same |
| US4368407A (en) * | 1979-08-31 | 1983-01-11 | Frequency Technology, Inc. | Inductor-capacitor impedance devices and method of making the same |
| US4524341A (en) * | 1983-02-07 | 1985-06-18 | Owen D W | Transformer with series-parallel-series winding between split winding |
| US4692566A (en) * | 1984-07-24 | 1987-09-08 | Phelps Dodge Industries, Inc. | Ribbon cable |
| JPS61195507A (en) * | 1985-02-25 | 1986-08-29 | 沖電気工業株式会社 | Flexible cable and manufacture thereof |
| US5005100A (en) * | 1989-08-02 | 1991-04-02 | Southwest Electric Company | Transient-filtered transformer |
| US5130616A (en) * | 1990-11-13 | 1992-07-14 | Southwest Electric Company | Motor control system and components thereof |
| US5216356A (en) * | 1990-11-13 | 1993-06-01 | Southwest Electric Company | Shielded three phase transformer with tertiary winding |
| EP0632924A4 (en) * | 1992-03-25 | 1995-03-29 | Electric Power Res Inst | Improved core-form transformer. |
| US5449991A (en) * | 1993-09-20 | 1995-09-12 | Southwest Electric Company | Motor control system and apparatus for providing desired three-phase voltage therein using a main transformer energized through an autotransformer |
| GB9512440D0 (en) * | 1995-06-19 | 1995-08-23 | Thomson Consumer Electronics | Switched mode transformer without varnish dip |
| US5895026A (en) * | 1996-03-06 | 1999-04-20 | Kelsey-Hayes Company | Foil wound coil for a solenoid valve |
| WO1999006310A2 (en) * | 1997-08-04 | 1999-02-11 | Abb Power T & D Company Inc. | Method and apparatus for manufacturing a variable insulated helically wound electrical coil |
| US6492892B1 (en) | 1998-04-03 | 2002-12-10 | Abb Inc. | Magnet wire having differential build insulation |
| DE102004016197A1 (en) * | 2004-04-01 | 2005-10-20 | Abb Technology Ag Zuerich | Winding for a transformer or coil and method of manufacture |
| DE102007006005B3 (en) * | 2007-02-07 | 2008-07-31 | Volker Werner Hanser | High-voltage transformer, has high- and low-voltage coils, between which high-voltage insulation is provided, and electrically conductive layers placed on defined potentials, which are same or close to high and low-voltages, respectively |
| CN101051549B (en) * | 2007-02-07 | 2011-05-04 | 浙江大学 | Passive element integrated structure in realizing LLC resonant converter for flexible circuit board |
| DE102009045726A1 (en) * | 2009-10-15 | 2011-04-21 | Robert Bosch Gmbh | Solenoid valve e.g. servo valve, for use in common rail injector utilized for injecting diesel into combustion chamber of diesel engine, has solenoid coil including wound foil with electrically conductive layer that is made of copper |
| CN102163491A (en) * | 2010-12-27 | 2011-08-24 | 华为技术有限公司 | Flexible winding and inductor integrated with capacitor characteristic and manufacturing method of flexible winding |
| US20150279549A1 (en) * | 2012-08-06 | 2015-10-01 | The Trustees of Dartmouth College a nonprofit corporation of higher education (103c) | Systems and methods for promoting low loss in parallel conductors at high frequencies |
| FI125524B (en) | 2014-06-19 | 2015-11-13 | Efore Oyj | Transformer |
| FR3033198B1 (en) * | 2015-02-26 | 2018-07-27 | Nexans | SYSTEM FOR MONITORING A HIGH VOLTAGE LINE WITH CONTINUOUS CURRENT |
| US11114232B2 (en) * | 2017-09-12 | 2021-09-07 | Raycap IP Development Ltd | Inductor assemblies |
| NO20201199A1 (en) * | 2020-11-04 | 2022-05-05 | Seid As | High-voltage transformer for a plasma-based gas-treatment apparatus |
| EP3996117B1 (en) * | 2020-11-06 | 2025-04-16 | Hitachi Energy Ltd | Winding assembly |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US901299A (en) * | 1907-02-11 | 1908-10-13 | Isidor Kitsee | Method of producing electric coils and conductors therefor. |
| US2980874A (en) * | 1957-09-16 | 1961-04-18 | John W Tarbox | Electric winding |
| US3102245A (en) * | 1959-08-03 | 1963-08-27 | Caledonia Electronics And Tran | Electrical transformer |
| US3560904A (en) * | 1968-04-19 | 1971-02-02 | Rolamite Technology Inc | Electric coils |
-
1974
- 1974-05-07 US US467756A patent/US3891955A/en not_active Expired - Lifetime
-
1975
- 1975-04-24 CA CA225,356A patent/CA1038464A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3891955A (en) | 1975-06-24 |
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