CA1155505A - Regulating winding connected in series with a main winding of a transformer - Google Patents
Regulating winding connected in series with a main winding of a transformerInfo
- Publication number
- CA1155505A CA1155505A CA000381545A CA381545A CA1155505A CA 1155505 A CA1155505 A CA 1155505A CA 000381545 A CA000381545 A CA 000381545A CA 381545 A CA381545 A CA 381545A CA 1155505 A CA1155505 A CA 1155505A
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- current
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- loop
- potential
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Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a regulating winding for a transformer in which a plurality of helical current-carry-ing conductor loops are connected in series with each other, whereas a plurality of non-current-carrying helical potential control loops are provided adjacent to the current-carrying loops and are connected to appropriate ones of the current-carrying loops in such a way that a substantial increase in the series capacity of the regulating winding is obtained with a relatively small increase in the space required for the regulating winding.
The invention relates to a regulating winding for a transformer in which a plurality of helical current-carry-ing conductor loops are connected in series with each other, whereas a plurality of non-current-carrying helical potential control loops are provided adjacent to the current-carrying loops and are connected to appropriate ones of the current-carrying loops in such a way that a substantial increase in the series capacity of the regulating winding is obtained with a relatively small increase in the space required for the regulating winding.
Description
1 15~5 .
Regulating winding connected in series with a main winding of a transformer Technical Field . .
This invention relates to a multi-turn regulating winding arranged in a transformer and provided with a plur~
ality of connecting contacts (e.g. for an on-load tap-changer) arranged at different potentials, the separateturns of the regulating winding being series-connected with - each other. Such regulating windings are known from Swedish Patent No. 389,942 and from published German Patent Application 2938531.
Discussion of Prior Art During transient oscillations, high voltages will often occur across the regulating winding, especially across the end portions of the regulating winding. It is ~nown that these overvoltages are dependent on the capacitive coupling between the different turns of the regulating winding in such a way that a relatively strong capacitive coupling gives lower overvoltages than those obtained when there is a relatively weak capacitive coupling. I~hen designing a regulating winding,the aim is therefore to obtain as high a value as possible for the so-called series_capacitance of the regulating windingg or in other words, the aim is to maxi-mize the ability of the regulating winding to store capaci-) ~ tive energy. It is thus known to arrange, for this purpose, an electrostatic screen radially outside the regulating winding. Such a screen has a uniform potential equal tothat of its point of connection to the winding. This means that the electrical insulation between the electrostatic screen and the regulating winding must be capable of with-standing the total voltage across the regulating winding, which sets a limit on the increase in the series capacitance that may be attained with the aid of an electrostatic screen, and, since the screen must be spaced a relatively large distance away from the winding, the use of an elec~ro-static screen considerably increases the space required for the regul~ting winding.
Disclosure of the Invention According to the invention there is provided a regu-lating winding arranged in a transformer and provided with a plurality of connecting contacts, arranged at differer.t potentials, each connecting contact representing a corres-ponding regulating step, said winding comprlsing a plurality of multi-turn, substantially helical current-carrying con-ductor loops, said current~carrying conductor loops being electrically insulated from each other and arranged in such ~) a way that each one of said current-carrying conductor loops has a first end point at the one end of said winding and a second end point at the other end of said winding, a plural-ity of electrical connecting elements arranged to connect a plurality of said first end points to a plurality of said second end points in such a way that said helical current-carrying conductor loops are thereby series-connected with each other, each of said connecting elements belng connected to a respective one of said connecting contacts, which is characteri,.ed in that said winding also comprises a plural-ity of insulated, helical potential loops, each of which is arranged with at least one surface portion thereof facing an adjoining surface portion of at least on~ of said current-carrying conductor loops along at least part of the length .) 25 thereof, each of said potential loops at one or the other end of said winding having an end point, which by means of electrical connecting means, is placed in electrical connection w;th an end point of a corresponding current-carrying conductor loop located at the same end of the winding, whereby each potential loop has a surface portion confronting an adjacent surface portion belonging to a current-carrying conductor loop, but not to the current-carrying conductor loop which is electrically connected tothat potential loop.
Brief Description of Drawings The invention will now be described, by way of example, 1 ~555~5 ~, with refererlce to the accompanying drawingc,in which Figures 1, 2, 3 and 4 show axial sections through the cylinder wall of four different embodiments of a regulating winding according to the invention.
Description of ?referred Embodiments In each embodiment, the regulating winding is a substan-tially hollow cylindrical body and in ~he interests of clarity, the cross-sectional surfaces Or the current-carrying conduc-tor loops of the windings shown in the drawings have not been provided with the conventional hatching normally used ) to indicate a cross-section~
The regulating winding shown in Figure 1 has been provided by collecting eight electrically insulated copper bars 20 of rectangular cross-section and eight electrically insulated copper bars 21 also of rectangular cross-section in one bundle, the bars 21 being shown as havi~ng the same height but smaller width, than the bars 20. rhe bundle of bars 20, 21 is wound in two full turns so as to form a sub-stantially hollow cylindrical body with a vertical axis.
The sectional surfaces shown in Figure 1 all lie in the same axial plane, the sectional surfaces indicated by the arrow A
representing the beginning of the uppermost~turn a the sec-tional surfaces indicated by the arrow B representing the transition between the first and the second turn, and the ' 25 sectionai surfaces indicated by the arrow C representing the end of the second turn.
The conductors 20 thus form eight helical current-carrying loops and the conductors 21 form eight helical potential loops. The current-carrying conductor loops, which are designated by the Roman numbers I-VIII, are series-connected with each other by means of a plurality of electri-cal connecting elements shown schematically at 12'-18', and these elements are each provided with a corresponding conn-ecting contact 12-18 corresponding to the different regu-lating steps of the winding. The upper end of the current-1 ~$5 carr~ing conductor loop I is sho~.~n connected to a connect-ing contact 11 and to one end poin~ of a main windirg 10 of the transformer, which together with the regulating winding is wound around a transforrner leg (not shown).
The Roman numbers I-VIII indicate the sequence in which the corresponding current-carrying conductor loops are series-connected. The lower end of the current-carrying conductor loop VIII is connected to a contact 19 which represents the highest regulating stage in a regulating winding having the same windi.ng direction as the main winding 10.
In each of the potential loops, the upper end thereof is held at the same poential as the upper end of some of the current loops II, IV, V, VII by means of one of a plur-ality of potential connections 22-29~ In the drawings, each potential loo~ is provided with a number corresponding to the Roman number of the current-carr~ing conductor loop to the upper end of which the upper end of that potential loop is electrically connected. No potential loop is directly connected to an i~mediately adjacent current-carrying conductor ioop~ which means that the potential difference between any point in a current loop and the nearest point in an adjacent potential loop is always greater than zero. With the current loop I, this p~tential differ-ence during normal operation is equal to the voltage appear-~ ` 25 ing across the series-connected current loops I, II, III and ) IV, and with the current loop VIII~ the above-mentioned potential difference is equal to the voltage appearing across the series-connected current loops IV, V, VI and VII. Thus with both current loops I and VIII the potential difference is equal to 50% of the full voltage appearing across the regulating winding5 With the current loops II
and VII, the potential difference in question is equal to 37.5% of the full voltage appearing across the regulating winding, the corresponding potential difference for each of the current loops III, IV, V and VI being 25% of the full regulating winding voltage.
In ~igures 2, 3 and 4, reference numerals which are also used in Figure 1 denote the same items.
The regulating winding sho~ln in Figure 2 - which is similar to that shown in ~igure 1 - de~ines a substantially hollow cylindrical body which is formed by winding a con-ductor bundle two full turns along a helical line. For the sake of clarity, the winding shown in Figure 2 has also been drawn with gaps between the turns. The winding has a vertical longitudinal ax;s and each turn comprises eight substantially helical current-carrylng conductor loops. These are arranged with two loops forming a pair in the radial direc-) tion so that only four potential loops are required~ the opposite side surfaces of each potential loop facing and making mechanical contact with a different one of the current loops in each pair.
As in the e~bodiment shown in Figure 1, the potentialloops are arranged in direct electrical connection with each other or with a current loop only at the upper end of the winding. The corresponding potential connections are designated 31, 32, 33 and 34 in Figure 2.
The potential difference between any ~oint in any of the current loops I and VIII and the nearest point in an adjacent potential loop is equal to the voltage across four ) series-connected current loops, thus representing 50%
of the total voltage appearing across the regulating winding.
The corresponding potential di~ferences cf the current loops II and VII are 37.5~, of the current loops III and VI 25%, and of the current loops IV and V 12.5~, which last mentioned potential difference is equal to the voltage ap~earing across a single current loop.
In the regulating winding shown in Figure 3, the partial sectional surfaces A, B, C and D lie in an axial plane through the wall of a substantially hollow cylindrical body, which again is shown as having a vertical axis but which now 1 ~ 5 ~ 5 T~) 5 consists of three turns of a con~ c~or bundlP, each turn consisting of six insulated copper bars 35 of rectangular, relatively large cross-section forming the current loops and twelve insulated copper bars ~6 of the same height as the bars 35, but of reduced width, the bars 36 forming the volt-a~e loops. The sectional surface indicated by the arrow A
represents the start of the first turn and the sectional surface indicated by the arrow D represents the end of the third turnO ~he winding thus contains six insulated, substan-tially helical current conductor loops I-VI and twelve insulated, substantially helical potential loops, the two ) opposite side surfaces of each'current loop being each arranged in mechanical contact with a different potential loop along the entire length of the winding. The lnvention also includes arrangements in which contact between the current and voltage loops only existsalong part of the length of at least some o. the current loops. By means of a plural-ity of potential connections ~indicated by short lines in Figure 3, but not numbered), the upper ends of the potential loops and the upper ends of the curren~ loops are connected together in pairs. In the same way as in Figures 1 and 2, each of the potential loops in Figure 3 is provided with a nùmber corres'ponding to the Roman number of the current loop to which it is connectedO The current loops I-~I are series-connected to each other by means of a plurality of connecting elements 12'-16', which are provided with corres-ponding connecting contacts 12-16 intended for an on-load tap changer. In all current loops I-VI and at each point thereof, the potential in relation to the nearest point of any adjoining potential loop is equal to the voltage across two series-connected current loops, that is, in nor~al operation it is equal to 33.3~ of the voltage appearing across the entire regulating winding.
In the regulating winding shown in Figure 4, the partial sectional surfaces designated by the arrows A, B and C
lie in an axial'plane through the wall of a substantially hollow cylindrical body again shown with its axis vertical.
1 ~555~
The ~inding illus~rated in ~igure 4 consists of a substantially helical bundle of copE)er bars ha~/inæ t--lo t~lrns~ the section-al surface indica ed by the arrow A l~ing at the start of the firs~ turn, the sectional surface indicated by the arrow B representing the tr~nsition between the first and the second turn, ancl the sec~ional surface indicated by the arrow C representing the end of the second turn. In Figure . 4, the bundle contains five insulated copper bars 37 of .~ rectangular, relatively large cross-section, which form five equally long helical current loops I-V~ and fifteen insu-lated copper bars 38 each of smaller rectangular cross-section than the bars 37, which bars 3~ form fifteen helical poten-) tial loops. The current loops are series-connected to each other by means of a plurality of electric connecting elements 12'-15', each of which is provided with a respective connecting contact 12-15. The end points of the series-connected group are connected to contacts 11 and 16 via connections 11' and 16'. The potential loops are again provided with numerals corresponding to the Roman numbers of the current: loops to which the potential loops are connected at their upper ends.
In the current loop I, the four limiting surfaces of the bar 37 forming the loop each makes contact with a corresponding potential loop, with a potential difference Of respectively one, three, three and three times the volt-age appearing across the current loop. Expressed in the same manner, the potential differences of the voltage loops surrounding the current loop V are three, two, two and two, the potential differences in the case of the current loop II
30 are two, two, one and one, whereas the potential differences in the case of the current loop II are two, three, two and one. The potential differences of the current loop IV in relation to each of the three adjoining potential loops at the upper end of the winding are twice the voltage across a current loop~ At other places in the winding the current conductor loop IV also makes contact with a potential loop poSitioned above it and has in relation thereto a potential 115550~ .
_ 9 _ whic~l is equal to the voltage across one current loop.
In all the embodiments of the invention, each one of a plurality o~ potential loops has, at one or the other end of the regulating winding, an end which is arranged in elec-trical connection with an end, located at the same end of - the winding, of a current loop which does not make mechanical contact via any of its side surfaces with the potential loop.
In the drawings, all the connections between the current loops and the potential loops have been shown to be located at the upper end of the winding. It is, of course, equally possible to use connection points which are only positioned at the lower end of the winding, or indeed to arrange some of these connections at the upper end of the winding and the remainder at the lower end of the winding.
- Although the illustrated embodîments all show the connections between loop ends positioned at the same end of the winding, this does not mean that the corresponding connecting wires have to be positioned at one end or the other end only of the winding. Thus, for example, the upper end of a potential loop can be directly connected to the lower end of a first current loop, so that the upper poten-) tial loop end is effectively also connected to the upper end of the second, series-connected current loop which follows immediately after the first current loop in the series group.
.
In the embodiments of the invention shown in the draw-ings, each current loop contains only one conductor. The invention also includes the case where each current loop is formed by a conductor which consists of a plurality of individually insulated and mutually parallel-connected bars or wire bundles of electrically conducting material.
Regulating winding connected in series with a main winding of a transformer Technical Field . .
This invention relates to a multi-turn regulating winding arranged in a transformer and provided with a plur~
ality of connecting contacts (e.g. for an on-load tap-changer) arranged at different potentials, the separateturns of the regulating winding being series-connected with - each other. Such regulating windings are known from Swedish Patent No. 389,942 and from published German Patent Application 2938531.
Discussion of Prior Art During transient oscillations, high voltages will often occur across the regulating winding, especially across the end portions of the regulating winding. It is ~nown that these overvoltages are dependent on the capacitive coupling between the different turns of the regulating winding in such a way that a relatively strong capacitive coupling gives lower overvoltages than those obtained when there is a relatively weak capacitive coupling. I~hen designing a regulating winding,the aim is therefore to obtain as high a value as possible for the so-called series_capacitance of the regulating windingg or in other words, the aim is to maxi-mize the ability of the regulating winding to store capaci-) ~ tive energy. It is thus known to arrange, for this purpose, an electrostatic screen radially outside the regulating winding. Such a screen has a uniform potential equal tothat of its point of connection to the winding. This means that the electrical insulation between the electrostatic screen and the regulating winding must be capable of with-standing the total voltage across the regulating winding, which sets a limit on the increase in the series capacitance that may be attained with the aid of an electrostatic screen, and, since the screen must be spaced a relatively large distance away from the winding, the use of an elec~ro-static screen considerably increases the space required for the regul~ting winding.
Disclosure of the Invention According to the invention there is provided a regu-lating winding arranged in a transformer and provided with a plurality of connecting contacts, arranged at differer.t potentials, each connecting contact representing a corres-ponding regulating step, said winding comprlsing a plurality of multi-turn, substantially helical current-carrying con-ductor loops, said current~carrying conductor loops being electrically insulated from each other and arranged in such ~) a way that each one of said current-carrying conductor loops has a first end point at the one end of said winding and a second end point at the other end of said winding, a plural-ity of electrical connecting elements arranged to connect a plurality of said first end points to a plurality of said second end points in such a way that said helical current-carrying conductor loops are thereby series-connected with each other, each of said connecting elements belng connected to a respective one of said connecting contacts, which is characteri,.ed in that said winding also comprises a plural-ity of insulated, helical potential loops, each of which is arranged with at least one surface portion thereof facing an adjoining surface portion of at least on~ of said current-carrying conductor loops along at least part of the length .) 25 thereof, each of said potential loops at one or the other end of said winding having an end point, which by means of electrical connecting means, is placed in electrical connection w;th an end point of a corresponding current-carrying conductor loop located at the same end of the winding, whereby each potential loop has a surface portion confronting an adjacent surface portion belonging to a current-carrying conductor loop, but not to the current-carrying conductor loop which is electrically connected tothat potential loop.
Brief Description of Drawings The invention will now be described, by way of example, 1 ~555~5 ~, with refererlce to the accompanying drawingc,in which Figures 1, 2, 3 and 4 show axial sections through the cylinder wall of four different embodiments of a regulating winding according to the invention.
Description of ?referred Embodiments In each embodiment, the regulating winding is a substan-tially hollow cylindrical body and in ~he interests of clarity, the cross-sectional surfaces Or the current-carrying conduc-tor loops of the windings shown in the drawings have not been provided with the conventional hatching normally used ) to indicate a cross-section~
The regulating winding shown in Figure 1 has been provided by collecting eight electrically insulated copper bars 20 of rectangular cross-section and eight electrically insulated copper bars 21 also of rectangular cross-section in one bundle, the bars 21 being shown as havi~ng the same height but smaller width, than the bars 20. rhe bundle of bars 20, 21 is wound in two full turns so as to form a sub-stantially hollow cylindrical body with a vertical axis.
The sectional surfaces shown in Figure 1 all lie in the same axial plane, the sectional surfaces indicated by the arrow A
representing the beginning of the uppermost~turn a the sec-tional surfaces indicated by the arrow B representing the transition between the first and the second turn, and the ' 25 sectionai surfaces indicated by the arrow C representing the end of the second turn.
The conductors 20 thus form eight helical current-carrying loops and the conductors 21 form eight helical potential loops. The current-carrying conductor loops, which are designated by the Roman numbers I-VIII, are series-connected with each other by means of a plurality of electri-cal connecting elements shown schematically at 12'-18', and these elements are each provided with a corresponding conn-ecting contact 12-18 corresponding to the different regu-lating steps of the winding. The upper end of the current-1 ~$5 carr~ing conductor loop I is sho~.~n connected to a connect-ing contact 11 and to one end poin~ of a main windirg 10 of the transformer, which together with the regulating winding is wound around a transforrner leg (not shown).
The Roman numbers I-VIII indicate the sequence in which the corresponding current-carrying conductor loops are series-connected. The lower end of the current-carrying conductor loop VIII is connected to a contact 19 which represents the highest regulating stage in a regulating winding having the same windi.ng direction as the main winding 10.
In each of the potential loops, the upper end thereof is held at the same poential as the upper end of some of the current loops II, IV, V, VII by means of one of a plur-ality of potential connections 22-29~ In the drawings, each potential loo~ is provided with a number corresponding to the Roman number of the current-carr~ing conductor loop to the upper end of which the upper end of that potential loop is electrically connected. No potential loop is directly connected to an i~mediately adjacent current-carrying conductor ioop~ which means that the potential difference between any point in a current loop and the nearest point in an adjacent potential loop is always greater than zero. With the current loop I, this p~tential differ-ence during normal operation is equal to the voltage appear-~ ` 25 ing across the series-connected current loops I, II, III and ) IV, and with the current loop VIII~ the above-mentioned potential difference is equal to the voltage appearing across the series-connected current loops IV, V, VI and VII. Thus with both current loops I and VIII the potential difference is equal to 50% of the full voltage appearing across the regulating winding5 With the current loops II
and VII, the potential difference in question is equal to 37.5% of the full voltage appearing across the regulating winding, the corresponding potential difference for each of the current loops III, IV, V and VI being 25% of the full regulating winding voltage.
In ~igures 2, 3 and 4, reference numerals which are also used in Figure 1 denote the same items.
The regulating winding sho~ln in Figure 2 - which is similar to that shown in ~igure 1 - de~ines a substantially hollow cylindrical body which is formed by winding a con-ductor bundle two full turns along a helical line. For the sake of clarity, the winding shown in Figure 2 has also been drawn with gaps between the turns. The winding has a vertical longitudinal ax;s and each turn comprises eight substantially helical current-carrylng conductor loops. These are arranged with two loops forming a pair in the radial direc-) tion so that only four potential loops are required~ the opposite side surfaces of each potential loop facing and making mechanical contact with a different one of the current loops in each pair.
As in the e~bodiment shown in Figure 1, the potentialloops are arranged in direct electrical connection with each other or with a current loop only at the upper end of the winding. The corresponding potential connections are designated 31, 32, 33 and 34 in Figure 2.
The potential difference between any ~oint in any of the current loops I and VIII and the nearest point in an adjacent potential loop is equal to the voltage across four ) series-connected current loops, thus representing 50%
of the total voltage appearing across the regulating winding.
The corresponding potential di~ferences cf the current loops II and VII are 37.5~, of the current loops III and VI 25%, and of the current loops IV and V 12.5~, which last mentioned potential difference is equal to the voltage ap~earing across a single current loop.
In the regulating winding shown in Figure 3, the partial sectional surfaces A, B, C and D lie in an axial plane through the wall of a substantially hollow cylindrical body, which again is shown as having a vertical axis but which now 1 ~ 5 ~ 5 T~) 5 consists of three turns of a con~ c~or bundlP, each turn consisting of six insulated copper bars 35 of rectangular, relatively large cross-section forming the current loops and twelve insulated copper bars ~6 of the same height as the bars 35, but of reduced width, the bars 36 forming the volt-a~e loops. The sectional surface indicated by the arrow A
represents the start of the first turn and the sectional surface indicated by the arrow D represents the end of the third turnO ~he winding thus contains six insulated, substan-tially helical current conductor loops I-VI and twelve insulated, substantially helical potential loops, the two ) opposite side surfaces of each'current loop being each arranged in mechanical contact with a different potential loop along the entire length of the winding. The lnvention also includes arrangements in which contact between the current and voltage loops only existsalong part of the length of at least some o. the current loops. By means of a plural-ity of potential connections ~indicated by short lines in Figure 3, but not numbered), the upper ends of the potential loops and the upper ends of the curren~ loops are connected together in pairs. In the same way as in Figures 1 and 2, each of the potential loops in Figure 3 is provided with a nùmber corres'ponding to the Roman number of the current loop to which it is connectedO The current loops I-~I are series-connected to each other by means of a plurality of connecting elements 12'-16', which are provided with corres-ponding connecting contacts 12-16 intended for an on-load tap changer. In all current loops I-VI and at each point thereof, the potential in relation to the nearest point of any adjoining potential loop is equal to the voltage across two series-connected current loops, that is, in nor~al operation it is equal to 33.3~ of the voltage appearing across the entire regulating winding.
In the regulating winding shown in Figure 4, the partial sectional surfaces designated by the arrows A, B and C
lie in an axial'plane through the wall of a substantially hollow cylindrical body again shown with its axis vertical.
1 ~555~
The ~inding illus~rated in ~igure 4 consists of a substantially helical bundle of copE)er bars ha~/inæ t--lo t~lrns~ the section-al surface indica ed by the arrow A l~ing at the start of the firs~ turn, the sectional surface indicated by the arrow B representing the tr~nsition between the first and the second turn, ancl the sec~ional surface indicated by the arrow C representing the end of the second turn. In Figure . 4, the bundle contains five insulated copper bars 37 of .~ rectangular, relatively large cross-section, which form five equally long helical current loops I-V~ and fifteen insu-lated copper bars 38 each of smaller rectangular cross-section than the bars 37, which bars 3~ form fifteen helical poten-) tial loops. The current loops are series-connected to each other by means of a plurality of electric connecting elements 12'-15', each of which is provided with a respective connecting contact 12-15. The end points of the series-connected group are connected to contacts 11 and 16 via connections 11' and 16'. The potential loops are again provided with numerals corresponding to the Roman numbers of the current: loops to which the potential loops are connected at their upper ends.
In the current loop I, the four limiting surfaces of the bar 37 forming the loop each makes contact with a corresponding potential loop, with a potential difference Of respectively one, three, three and three times the volt-age appearing across the current loop. Expressed in the same manner, the potential differences of the voltage loops surrounding the current loop V are three, two, two and two, the potential differences in the case of the current loop II
30 are two, two, one and one, whereas the potential differences in the case of the current loop II are two, three, two and one. The potential differences of the current loop IV in relation to each of the three adjoining potential loops at the upper end of the winding are twice the voltage across a current loop~ At other places in the winding the current conductor loop IV also makes contact with a potential loop poSitioned above it and has in relation thereto a potential 115550~ .
_ 9 _ whic~l is equal to the voltage across one current loop.
In all the embodiments of the invention, each one of a plurality o~ potential loops has, at one or the other end of the regulating winding, an end which is arranged in elec-trical connection with an end, located at the same end of - the winding, of a current loop which does not make mechanical contact via any of its side surfaces with the potential loop.
In the drawings, all the connections between the current loops and the potential loops have been shown to be located at the upper end of the winding. It is, of course, equally possible to use connection points which are only positioned at the lower end of the winding, or indeed to arrange some of these connections at the upper end of the winding and the remainder at the lower end of the winding.
- Although the illustrated embodîments all show the connections between loop ends positioned at the same end of the winding, this does not mean that the corresponding connecting wires have to be positioned at one end or the other end only of the winding. Thus, for example, the upper end of a potential loop can be directly connected to the lower end of a first current loop, so that the upper poten-) tial loop end is effectively also connected to the upper end of the second, series-connected current loop which follows immediately after the first current loop in the series group.
.
In the embodiments of the invention shown in the draw-ings, each current loop contains only one conductor. The invention also includes the case where each current loop is formed by a conductor which consists of a plurality of individually insulated and mutually parallel-connected bars or wire bundles of electrically conducting material.
Claims (4)
1. A regulating winding arranged in a transformer and provided with a plurality of connecting contacts, arranged at different potentials, each connecting contact representing a corresponding regulating step, said winding comprising a plurality of multi-turn, substantially helical current-carrying conductor loops, said current-carrying conductor loops being electrically insulated from each other and arranged in such a way that each one of said current-carry-ing conductor loops has a first end point at the one end of said winding and a second end point at the other end of said winding, a plurality of electrical connecting elements arranged to connect a plurality of said first end points to a plurality of said second end points in such a way that said helical current-carrying conductor loops are thereby series-connected with each other, each of said connecting elements being connected to a respective one of said connec-ting contacts, characterized in that said winding also com-prises a plurality of insulated helical potential loops, each of which is arranged with at least one surface portion there-of facing an adjoining surface portion of at least one of said current-carrying conductor loops along at least part of the length thereof, each of said potential loops at one or the other end of said winding having an end point which by means of electrical connecting means, is placed in electrical connection with an end point of a correspond-ing current-carrying conductor loop located at the same end of the winding, whereby each potential loop has a surface portion confronting an adjacent surface portion belonging to a current-carrying conductor loop, but not to the current-carrying conductor loop which is electrically connected to that potential loop.
2. A regulating winding according to claim 1, in which the number of current-carrying conductor loops deviates from the number of potential loops, each loop of one type being positioned between two loops of the other type.
3. A regulating winding according to claim 2, in which a plurality of said current-carrying conductor loops are each surrounded by four potential loops each of which makes contact with the current-carrying conductor loop.
4. A regulating winding according to claim 3, in which each current-carrying conductor loop is formed from rectangu-lar section material and each of said four potential loops contacts a different side of the said current-carrying loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000381545A CA1155505A (en) | 1981-07-10 | 1981-07-10 | Regulating winding connected in series with a main winding of a transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000381545A CA1155505A (en) | 1981-07-10 | 1981-07-10 | Regulating winding connected in series with a main winding of a transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1155505A true CA1155505A (en) | 1983-10-18 |
Family
ID=4120418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000381545A Expired CA1155505A (en) | 1981-07-10 | 1981-07-10 | Regulating winding connected in series with a main winding of a transformer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1155505A (en) |
-
1981
- 1981-07-10 CA CA000381545A patent/CA1155505A/en not_active Expired
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