CN218730317U - Lead structure and transformer - Google Patents
Lead structure and transformer Download PDFInfo
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- CN218730317U CN218730317U CN202222944566.2U CN202222944566U CN218730317U CN 218730317 U CN218730317 U CN 218730317U CN 202222944566 U CN202222944566 U CN 202222944566U CN 218730317 U CN218730317 U CN 218730317U
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Abstract
The utility model provides a lead structure and a transformer, wherein the lead structure comprises a lead and a lead, and the lead is electrically connected with the lead through a wiring terminal; the lead consists of a plurality of cables, the lead comprises a first connecting part and a second connecting part, one end of the first connecting part is electrically connected with the lead, and the other end of the first connecting part is connected with the second connecting part; the first connecting part is formed by twisting all cables to form a twisted wire, and the second connecting part is formed by sequentially arranging all cables to form a connecting wire. The technical scheme of the utility model divides the lead into a plurality of cables, and the cables are short-circuited with the leads, and the plurality of cables are twisted in a twisting mode, so that mutual shielding is realized among each cable, circulation between the leads and between the leads is reduced, and a series of problems of increased circulation, increased loss, local overheating of the leads and the like of the traditional lead in a high magnetic leakage strong electric field area are improved; the stability of the transformer is improved, and the transformer is applicable to all high capacity transformers, and the compatibility is strong, has improved product competitiveness.
Description
Technical Field
The utility model relates to a transformer technical field, in particular to lead wire structure and transformer.
Background
With the development of power systems, the development of power transformers with higher efficiency, higher quality and lower failure rate is being pursued. With the development of the times, the requirements of industrial power and civil power are continuously improved, so that the ultra-high voltage grade and ultra-high capacity transformer products in the power system are more and more widely applied.
However, the ultra-high voltage and ultra-large capacity transformer product has the internal characteristics of high leakage magnetic field, and puts higher and more complex requirements on electromagnetic field calculation and structural design of the transformer. Wherein, the reasonable design of the lead structure influences the quality and the safety of the whole product to a great extent. System failures and product failures caused by an unreasonable design of the lead structure during the operation of the transformer account for a large proportion.
In the prior art, the lead structure generally adopts a single cable, a plurality of parallel cables, a copper bar, a copper pipe, a copper bar and the like to be connected according to a certain connection mode to form, and the loss and the temperature rise are reduced by increasing the insulation distance, improving the heat dissipation condition and changing the spatial position of a lead conductor in an electromagnetic field when the lead structure passes through a high-leakage strong electric field area. Along with the increase of the capacity of the transformer, the section of the lead wire is increased, the size of an oil tank is increased, the balance among the loss, the temperature rise and the insulation structure of the lead wire is difficult to control, and meanwhile, the economical efficiency of the transformer product is sharply reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a lead wire structure and transformer aims at solving among the prior art lead wire and adopts increase insulation distance more, improves the heat dissipation condition, changes the spatial position of lead wire conductor in the electromagnetic field and come reduce loss and temperature rise to lead to can't use on the transformer of large capacity, big lead wire cross-section, big oil tank etc. compatibility is poor, and the loss of wire, the balance between temperature rise and the insulation system is difficult to control, leads to cost increase's technical problem.
In order to achieve the above object, the present invention provides a lead structure, which includes:
a wire;
the lead is electrically connected with the lead through a wiring terminal;
the lead consists of a plurality of cables, the lead comprises a first connecting part and a second connecting part, one end of the first connecting part is electrically connected with the lead, and the other end of the first connecting part is connected with the second connecting part;
the first connecting part is formed by twisting all the cables to form a twisted wire, and the second connecting part is formed by sequentially arranging all the cables to form a connecting wire.
Optionally, in the first connection portion, each cable is correspondingly wrapped with a first insulating layer, and after all the cables are twisted into the twisted wire, the twisted wire is uniformly wrapped with an oil duct paper board and a second insulating layer.
Optionally, the radius of the cable is 13mm to 14mm, the thickness of the first insulating layer is 2mm to 3mm, and the thickness of the second insulating layer is 15mm to 16mm.
Optionally, in the second connection portion, a third insulating layer is wrapped on each cable, and the thickness of the third insulating layer is 20mm to 21mm.
Optionally, the strand pitch of the strand is 500mm to 510mm.
Optionally, the lead structure further includes a shielding layer, the shielding layer is disposed on the wire, and a diameter of the shielding layer is 80mm to 81mm.
Optionally, the lead structure further comprises an insulator, the wire and the lead being disposed within the insulator.
Optionally, an insulating oil passage is arranged between the insulating member and the lead wire and between the insulating member and the lead wire.
Optionally, the position of the terminal is the highest point of the lead structure.
Furthermore, in order to solve the above problems, the present invention also provides a transformer, wherein the transformer is applied with the lead structure as above.
The technical scheme of the utility model divides the lead into a plurality of cables, and the cables are short-circuited with the leads, and a plurality of cables are twisted in a twisting mode, so that mutual shielding is realized between each cable, circulation between the leads and between the leads is reduced, and a series of problems of increased circulation between the leads, increased loss, local overheating of the leads and the like in a high magnetic leakage strong electric field area of the traditional lead are improved; the stability of the transformer is improved, the transformer is suitable for all high-capacity transformers, the compatibility is strong, and the product competitiveness is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of the lead structure of the present invention;
fig. 2 is a view in the direction a in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name(s) |
| 10 | Conducting |
20 | |
| 21 | Cable with a |
30 | Insulating |
| 40 | Connecting terminal |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The utility model provides a lead 20 structure, please refer to fig. 1, the lead 20 structure includes a wire 10 and a lead 20, the wire 10 is electrically connected with the lead 20 through a connecting terminal 40; the lead 20 is composed of a plurality of cables 21, the lead 20 includes a first connection portion and a second connection portion, one end of the first connection portion is electrically connected with the lead 10, and the other end is connected with the second connection portion; the first connection portion is formed by twisting all the cables 21 to form a twisted wire, and the second connection portion is formed by arranging all the cables 21 in sequence to form a connection wire.
The lead 20 structure is suitable for various high-capacity transformers and various application environments with high magnetic leakage and strong magnetic fields.
The wire 10 is connected to the lead 20 through the connection terminal 40. The lead wire 20 is formed by combining a plurality of cables 21. In the present embodiment, an example in which one lead wire 20 includes three cables 21 will be described.
When connecting, the lead wire 10 is divided into three equal parts, and each part is electrically connected with one cable 21 through the wiring terminal 40. The three portions of the conductive wires 10 are respectively short-circuited with the three cables at the connection terminals as one point to suppress the circulating current between the conductive wires 10 and between the lead wires 20.
The lead 20 is divided into two parts including a first connection part and a second connection part. When assembling, the first connecting part is applied to the environment with high magnetic leakage and strong magnetic field. In the second connection portion, the three cables 21 are arranged in a twisted manner to form a twisted wire. Thereby providing a mutual shielding effect between the wires 21 and further reducing the circulating current between the leads 20.
In addition, by controlling the voltage connection point of each cable 21 of the lead wire 10 and the lead wire 20 and appropriately transposing the high-leakage strong electric field area, the circulation current and the eddy current in the lead wire 10 are greatly reduced, and the eddy current and the inter-wire circulation current of the lead wire 20 are effectively reduced. And the stray loss of the lead 20 is greatly reduced, the temperature rise is obviously reduced, and the temperature rise limit value of the local hot spot is ensured.
More specifically, when the lead 20 structure is applied to the ODFPS-700000/750 type transformer, the verification result shows that the circulation of the lead 10 in the electromagnetic field is reduced from 1350A to 952A and the temperature rise of the lead 10 is reduced by about 15K.
After an excessively high leakage magnetic field, the normal lead 20 structure, i.e., the second connection portion, is transformed. In the second connection portion, the three cables 21 are arranged in a "straight" shape in sequence, please refer to fig. 2, which is a view in a direction a in fig. 1, and the three cables 21 sequentially extend outward and are finally connected to other external electronic components.
The utility model discloses technical scheme will lead wire 20 divide into many cables 21, and with the short circuit of wire 10, and many adopt the mode of transposition to twine between the cable 21, realize mutual shielding between every cable 21, reduce the circulation between lead wire 20 and wire 10, improved traditional lead wire 20 and increased in the regional wire 10 circulation of high magnetic leakage strong electric field, the loss increases, a series of problems such as wire 10 local overheat; the stability of the transformer is improved, the transformer is suitable for all high-capacity transformers, the eddy current, the circulation loss and the stray loss in the lead 20 are reduced, the load loss is reduced, the product performance is improved, and the effect of avoiding local overheating of the lead 20 is remarkable. The product compatibility is strong, and the competitiveness is improved.
Further, in the first connection portion, each cable 21 is correspondingly covered with a first insulating layer, and after all the cables 21 are twisted into the twisted wire, the twisted wire is uniformly covered with an oil duct paper board and a second insulating layer.
Each of the three wires 21 has a first insulating layer independent of the other wires 21 to prevent an increase in eddy current loss of the lead wires 20. After the three cables 21 are transposed in a twisting manner, the periphery of the formed twisted wire is wrapped with a whole package, namely, a layer of oil duct paper board and a second insulating layer are wrapped, so that the heat dissipation of the lead 10 is facilitated, the temperature rise of the lead 10 is reduced, and the insulating strength is enhanced.
Specifically, the radius of the cable 21 can be set between 13mm and 14mm, and the cross-sectional area of the cable 21 is about 185mm2 to 190mm 2; the thickness of the first insulating layer may be set between 2mm and 3mm, and the thickness of the second insulating layer may be set between 15mm and 16mm.
It should be noted that the diameter of the cable 21, the first insulating layer, the second insulating layer and the oil channel paper board may be adjusted according to the actual electric field strength, including but not limited to the above solutions, so as to meet the requirements of more different electrical appliances.
Furthermore, in the second connection portion, each cable 21 is wrapped with a third insulating layer, and the thickness of the third insulating layer is 20mm to 21mm. After passing through the high leakage magnetic field, the three cables 21 are led out in a preset sequence, and are not packaged on the second connecting part, so that the production operation is facilitated. In order to further ensure the stability of the product, after the three cables 21 are threaded out to the second connection portion, each cable 21 is covered with a third insulating layer which is independent of each other.
Further, the three cables 21 are connected in a twisted manner, and the twisted pitch of the twisted wires is 500mm to 510mm. Each wire 21 is helically rotated one turn, and the length of each turn (i.e., pitch) may be set to 500mm to 510mm.
The three cables 21 can be transposed in a certain transposition pitch according to a simulation result in an electric field simulation mode, so that the three cables 21 have the same position and length in an electric field, a mutual shielding effect is achieved, and the circulation current between the leads 20 is effectively reduced.
The lead 20 structure further comprises a shielding layer, wherein the shielding layer is arranged on the lead 10, and the diameter of the shielding layer is 80-81 mm. The wire 10 needs to be wrapped with a shielding tape, and a shielding material is wound around the wire 10 to form a shielding layer, wherein the diameter of the shielding layer and the wire 10 after winding is about 80 mm.
In the embodiment, when the lead wire 10 and the lead wire 20 are connected by the connection terminal 40, the shielding layer and the first insulating layer are stripped and then contacted with each other to form a whole, that is, after the electrical connection, the shielding layer is wound.
Mutual shielding is realized among the cables 21, circulation between the lead wires 20 and between the lead wires 10 is reduced, and a series of problems that the circulation between the lead wires 10 is increased, loss is increased, the lead wires 10 are locally overheated and the like in a high-magnetic-leakage strong electric field area of the traditional lead wires 20 are solved; the stability of the transformer is improved.
The lead wire 20 structure further includes an insulator in which the wire 10 and the lead wire 20 are disposed. An insulating oil passage 30 is provided between the insulating member and the lead wire 10 and the lead wire 20.
After the three cables 21 are transposed, the first connecting portion needs to be covered with oil duct insulation, that is, oil is added between the oil duct paper board and the insulating member. Thereby form insulating oil duct 30, insulating oil duct 30 can do benefit to the heat dissipation of wire 10, lead wire 20, reduces the temperature rise of wire 10, strengthens dielectric strength.
In addition, oil may be added between the wire 10 and the insulator, thereby forming the insulating oil passage 30 to further improve the stability of the structure of the lead 20.
The position of the wiring terminal 40 is the highest point of the structure of the lead 20. After the wire 10 is covered with the shielding layer and the oil-way insulation layer, the connection position of the wire 10 and the lead 20 should be set to the highest position, that is, the position of the terminal 40 is the highest point, so as to avoid the air-tight condition in the insulation member.
Furthermore, in order to solve the above problem, the present invention also provides a transformer, wherein the transformer is applied with the lead wire 20 structure as described above.
The lead 20 structure is suitable for various high-capacity transformers and various application environments with high magnetic leakage and strong magnetic fields.
The wire 10 is connected to the lead 20 through the connection terminal 40. The lead wire 20 is formed by combining a plurality of cables 21. In the present embodiment, an example in which one lead 20 includes three cables 21 will be described.
When connecting, the lead wire 10 is divided into three equal parts, and each part is electrically connected with one cable 21 through the wiring terminal 40. Three portions of the conductive wires 10 are respectively short-circuited with three cables at connection terminals to a point to suppress circulation between the conductive wires 10 and between the leads 20.
The lead 20 is divided into two parts including a first connection part and a second connection part. When assembling, the first connecting part is applied to the environment with high magnetic leakage and strong magnetic field. In the second connection portion, the three cables 21 are arranged in a twisted manner to form a twisted wire. Thereby providing a mutual shielding effect between the wires 21 and further reducing the circulating current between the leads 20.
In addition, by controlling the voltage connection point of each cable 21 of the lead wire 10 and the lead wire 20 and appropriately transposing the high-leakage strong electric field area, the circulation current and the eddy current in the lead wire 10 are greatly reduced, and the eddy current and the inter-wire circulation current of the lead wire 20 are effectively reduced. And stray loss of the lead 20 is greatly reduced, temperature rise is remarkably reduced, and the temperature rise limit value of the local hot spot is ensured.
More specifically, when the lead 20 structure is applied to the ODFPS-700000/750 type transformer, the verification result shows that the circulation of the lead 10 in the electromagnetic field is reduced from 1350A to 952A and the temperature rise of the lead 10 is reduced by about 15K.
After an excessively high leakage magnetic field, the normal lead 20 structure, i.e., the second connection portion, is transformed. In the second connection portion, the three cables 21 are arranged in a line shape in sequence, extend outwards in order, and are finally connected with other external electronic components.
The utility model discloses technical scheme will lead wire 20 divide into many cables 21, and with the short circuit of wire 10, and many adopt the mode of transposition to twine between the cable 21, realize mutual shielding between every cable 21, reduce the circulation between lead wire 20 and wire 10, improved traditional lead wire 20 and increased in the regional wire 10 circulation of high magnetic leakage strong electric field, the loss increases, a series of problems such as wire 10 local overheat; the stability of the transformer is improved, the transformer is suitable for all high-capacity transformers, eddy current, circulating current loss and stray loss in the lead 20 are reduced, load loss is reduced, product performance is improved, and the effect of avoiding local overheating of the lead 20 is remarkable. The product compatibility is strong, and the competitiveness is improved.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A lead structure, comprising:
a wire;
the lead is electrically connected with the lead through a wiring terminal;
the lead consists of a plurality of cables, the lead comprises a first connecting part and a second connecting part, one end of the first connecting part is electrically connected with the lead, and the other end of the first connecting part is connected with the second connecting part;
the first connecting part is formed by twisting all the cables to form a twisted wire, and the second connecting part is formed by arranging all the cables in sequence to form a connecting wire.
2. A lead structure according to claim 1, wherein a first insulating layer is provided on each of said cables in said first connection portion, and after all of said cables are twisted into said twisted wire, said twisted wire is collectively provided with an oil duct paper board and a second insulating layer.
3. The lead structure of claim 2, wherein the radius of the cable is 13mm to 14mm, the thickness of the first insulating layer is 2mm to 3mm, and the thickness of the second insulating layer is 15mm to 16mm.
4. The lead structure according to claim 1, wherein a third insulating layer is wrapped on each of the wires in the second connection portion, and a thickness of the third insulating layer is 20mm to 21mm.
5. The lead structure of claim 1, wherein a twist pitch of said litz wire is 500mm to 510mm.
6. The lead structure of claim 1, further comprising a shielding layer disposed on the wire and at the terminal, wherein the diameter of the shielding layer is 80mm to 81mm.
7. The lead structure of any one of claims 1-6, further comprising an insulator, said wire and said lead being disposed within said insulator.
8. The lead structure of claim 7, wherein an insulating oil passage is provided between the insulator and the lead.
9. A lead structure according to any one of claims 1 to 6, wherein the location of the terminal is the highest point of the lead structure.
10. A transformer, characterized in that the transformer employs the lead structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222944566.2U CN218730317U (en) | 2022-11-03 | 2022-11-03 | Lead structure and transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222944566.2U CN218730317U (en) | 2022-11-03 | 2022-11-03 | Lead structure and transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218730317U true CN218730317U (en) | 2023-03-24 |
Family
ID=85607724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222944566.2U Active CN218730317U (en) | 2022-11-03 | 2022-11-03 | Lead structure and transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218730317U (en) |
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2022
- 2022-11-03 CN CN202222944566.2U patent/CN218730317U/en active Active
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