CN114446609A - Design method and structure of flexible direct current transformer coil - Google Patents
Design method and structure of flexible direct current transformer coil Download PDFInfo
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- CN114446609A CN114446609A CN202210029312.XA CN202210029312A CN114446609A CN 114446609 A CN114446609 A CN 114446609A CN 202210029312 A CN202210029312 A CN 202210029312A CN 114446609 A CN114446609 A CN 114446609A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2876—Cooling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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Abstract
The invention relates to a design method of a flexible direct current transformer coil, which designs a spiral closed electrostatic ring structure, wherein the spiral closed electrostatic ring structure is oppositely arranged at the upper end part and the lower end part of a voltage regulating coil, and the shape of one end of the spiral closed electrostatic ring is matched with the spiral height of a lead at the end part of the voltage regulating coil; an oil duct cushion block is additionally arranged between the leads of the voltage regulating coil, and a valve side coil, a net side coil and the voltage regulating coil are sequentially arranged from inside to outside from the iron core to form the whole structure of the flexible direct current transformer coil. The invention also relates to a flexible direct current transformer coil structure, wherein eight axial leads are wound around the self-adhesive transposed conductor to form a single-spiral turn structure, an oil duct cushion block is additionally arranged between the self-adhesive transposed conductors, a head outlet fixing stay bar is arranged at the head outlet of the self-adhesive transposed conductor, and a PET (polyethylene terephthalate) tape is used for binding and fixing along the circumferential direction of the coil. The invention has good integrity and simple structure, can reduce the circulation loss and is beneficial to heat dissipation and ampere-turn balance.
Description
Technical Field
The invention belongs to the field of transformer production and manufacturing, and particularly relates to a design method and a structure of a flexible direct current transformer coil.
Background
The flexible direct-current transmission technology is a high point in the field of power electronic technology application in the world at present, is one of the transmission technologies with highest controllability and best adaptability in the world at present, can effectively improve the quality of electric energy, ensure the safe and stable operation of a power grid, construct a high-voltage flexible direct-current transmission project and promote the optimal configuration of energy sources.
For the flexible direct current transformer, when the voltage regulating coil is arranged on the outermost side, a layered coil structure is adopted, when the number of turns of the voltage regulating coil is small, the height of the voltage regulating coil is lower than that of an inner coil, and no oil duct is arranged between turns of the layered coil, so that heat dissipation is not facilitated. The radial outgoing line has too many taps, generally two to three turns are in one level, each level in the winding process needs to cut the line and process the outgoing insulation, the process is complex, and the work period control is not facilitated. When the voltage regulating coil adopts a spiral structure, a plurality of radial parallel winding coils and two axial parallel winding coils are generally arranged in parallel, the winding method is difficult to replace, the winding difficulty is high, the circulation loss is increased, and the end ring and the electrostatic ring generally adopt an open structure, are easy to deform and are not beneficial to the field intensity of the uniform end part. In addition, if the end part of the voltage regulating coil is flattened, a large triangular area is formed at the end part of the coil in the flattening process, the electric field distribution in the area is extremely uneven, copper stranded wires (equipotential lines) are bent greatly towards the coil, field intensity concentration can occur on wire cakes on the upper side and the lower side of the triangular area, and the discharge phenomenon is easy to occur, so that a transformer is damaged, and a spiral electrostatic ring structure matched with the end face spiral degree of the voltage regulating coil is required to be adopted. Therefore, the existing design method and structure of the coil cannot well meet the application requirements of the flexible direct current transformer.
Disclosure of Invention
In order to solve the technical problem, the invention provides a design method and a structure of a flexible direct current transformer coil, wherein a voltage regulating coil adopts a single-spiral voltage regulating coil structure. The technical scheme adopted by the invention is as follows:
a design method of a flexible direct current transformer coil comprises the following steps:
a single-spiral wire turn structure is wound by using a self-adhesive transposed conductor; designing a spiral closed electrostatic ring structure, wherein the spiral closed electrostatic ring structure is oppositely arranged at the upper end part and the lower end part of a single-spiral turn structure, and the shape of one end of the spiral closed electrostatic ring is matched with the spiral height of a lead at the end part of the single-spiral turn structure; an oil duct cushion block is additionally arranged between the wires of the single-spiral turn structure to form a voltage regulating coil; and a valve side coil, a net side coil and a voltage regulating coil are sequentially arranged from the inside to the outside from the iron core to form the whole structure of the flexible direct current transformer coil.
A flexible direct current transformer coil structure applies the design method of the flexible direct current transformer coil, and comprises the following steps: the valve side coil, the net side coil and the pressure regulating coil are sequentially arranged from inside to outside from the iron core; the voltage regulating coil includes: the device comprises a head outlet fixing stay, a self-adhesive transposition lead, an upper end spiral closed electrostatic ring, a lower end spiral closed electrostatic ring and an oil duct cushion block, wherein the self-adhesive transposition lead adopts eight axial leads and is wound to form a single spiral turn structure, the upper end part and the lower end part of the single spiral turn structure are respectively provided with the upper end spiral closed electrostatic ring and the lower end spiral closed electrostatic ring, the shapes of one ends of the upper end spiral closed electrostatic ring and the lower end spiral closed electrostatic ring are matched with the spiral height of the end face of the single spiral turn structure, the structures of the upper end spiral closed electrostatic ring and the lower end spiral closed electrostatic ring are the same, the assembly directions are opposite, the oil duct cushion block is additionally arranged between the self-adhesive transposition leads, the head outlet of the self-adhesive transposition lead is provided with a head outlet fixing stay, and is bound and fixed by a PET (polyethylene terephthalate) belt along the circumferential direction of a coil; the spiral closed electrostatic ring comprises an electrostatic ring framework, a copper woven belt, a copper stranded wire and an insulating layer; static ring skeleton be with single spiral turn of wire structure external diameter matched with ring form closed structure, the shape and the single spiral turn of wire structure terminal surface spiral height phase-match of the one end of static ring skeleton, the outside of static ring skeleton is twined in proper order and is wrapped up copper braid over braid and insulating layer, copper strand wires are laos curved and are embedded in the static ring skeleton that corresponds single spiral turn of wire structure position department of going out, the insulating paper is wrapped up to the copper strand wires surface, the one end and the copper braid over braid welding of copper strand wires, the other end of copper strand wires passes copper braid over braid and insulating layer is drawn forth, be connected with the first turn of line cake of single spiral turn of wire structure tip.
The invention has the beneficial effects that:
according to the design method and the structure of the flexible direct current transformer coil, eight wires of the single-spiral voltage regulating coil are axially arranged in parallel, the lengths of all the wires are ensured to be the same, and the circulating current loss can be effectively reduced; the integral height of the coil can be adjusted by adding the oil duct cushion block between turns in the height direction, so that heat dissipation and ampere-turn balance are facilitated; the axial head-out position is added with a head-out fixing stay bar, so that the short-circuit resistance of the coil is improved; the closed spiral closed electrostatic ring is adopted to enhance the anti-deformation capability, the roundness of the electrostatic ring can be effectively ensured, and the field intensity of the end part is beneficial to uniformity; and self-adhesive transposed conductors are adopted to enhance the short-circuit resistance of the coil. The coil has good structural integrity, simple structure and good manufacturability, and can be widely applied to the low-loss large-capacity flexible direct current transformer in the flexible direct current engineering with large unit capacity.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a flow chart of a method of designing a flexible DC transformer coil according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a coil according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a voltage regulating coil according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the voltage regulation coil wiring principle of an embodiment of the present invention;
FIG. 5 is a schematic external view of a spiral closed electrostatic ring according to an embodiment of the present invention;
FIG. 6 is a view of FIG. 5 taken in direction D of an embodiment of the present invention;
FIG. 7 is a sectional view taken along line A-A of FIG. 5 in accordance with an embodiment of the present invention;
FIG. 8 is a view from the B-B direction of FIG. 6 in accordance with an embodiment of the present invention;
in the figure, 1 is an iron core, 2 is a valve side coil, 3 is a net side coil, 4 is a pressure regulating coil, 5 is a head fixing stay, 6 is a self-adhesive transposition wire, 7 is an upper end spiral closed electrostatic ring, 8 is a lower end spiral closed electrostatic ring, 9 is an oil duct cushion block, 10 is an electrostatic ring framework, 11 is a copper braided belt, 12 is a copper stranded wire, and 13 is an insulating layer.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
Fig. 1 is a flowchart of a method for designing a flexible dc transformer coil according to an embodiment of the present invention. A design method of a flexible direct current transformer coil comprises the following steps:
a self-adhesive transposed conductor is adopted to wind a single-spiral turn structure to be used as a main body of the voltage regulating coil.
Aiming at the problems of extremely uneven electric field distribution at the end part of the voltage regulating coil and easy deformation of the open electrostatic ring, the spiral closed electrostatic ring structure is designed and is oppositely arranged at the upper end part and the lower end part of the single spiral turn structure, and the shape of one end of the spiral closed electrostatic ring is matched with the spiral height of a conducting wire at the end part of the single spiral turn structure, so that the ampere turns are balanced and the electric field distribution is even.
Aiming at the problems of the height of a layered coil and the inconvenience for heat dissipation, an oil duct cushion block is additionally arranged between wires of the pressure regulating coil, and the height of the coil is adjusted through the oil duct cushion block to form a heat dissipation oil duct.
In addition, a head outlet fixing stay is arranged at the head outlet of the lead, and a PET (polyethylene terephthalate) belt is used for binding and fixing along the circumferential direction of the coil, so that the strength and the short-circuit resistance of the pressure regulating coil are improved.
And a valve side coil, a net side coil and a voltage regulating coil are sequentially arranged from the inside to the outside from the iron core to form the whole structure of the flexible direct current transformer coil.
Fig. 2 is a schematic diagram of the overall structure of the coil according to the embodiment of the present invention. A flexible direct current transformer coil structure applies the design method of the flexible direct current transformer coil, and comprises the following steps: the valve side coil 2, the net side coil 3 and the voltage regulating coil 4 are sequentially arranged from inside to outside from the iron core 1, and the flexible direct current transformer coil integral structure is formed.
Fig. 3 is a schematic diagram of a voltage regulating coil according to an embodiment of the present invention. The voltage regulating coil 4 comprises: the device comprises a head-out fixing stay 5, a self-adhesive transposition lead 6, an upper end part spiral closed electrostatic ring 7, a lower end part spiral closed electrostatic ring 8 and an oil duct cushion block 9. The self-adhesive transposed conductor 6 adopts eight axial conductors and is wound to form a single-spiral turn structure, the conductors are wound in parallel without radiation, the lengths of all the conductors are ensured to be the same, the circulation loss is effectively reduced, and the short-circuit resistance of the coil is enhanced by adopting the self-adhesive transposed conductor. The upper end and the lower end of the single-spiral turn structure are provided with spiral heights, the upper end and the lower end of the single-spiral turn structure are respectively provided with an upper end spiral closed electrostatic ring 7 and a lower end spiral closed electrostatic ring 8, the shapes of one ends of the upper end spiral closed electrostatic ring 7 and the lower end spiral closed electrostatic ring 8 are matched with the spiral height of the end face of the single-spiral turn structure, the upper end spiral closed electrostatic ring 7 and the lower end spiral closed electrostatic ring 8 are identical in structure and opposite in assembling direction; the spiral closed electrostatic ring comprises: static ring skeleton, copper braid over braid and copper strand wires carry out low silver brazing at static ring skeleton external diameter side, the welding back copper strand wires lead static ring skeleton surface after encircleing through static ring skeleton trompil, be favorable to the transition of copper strand wires like this, can prevent that the welding department from being broken, three horn areas have been eliminated with the wire spiral height phase-match of single spiral turn structure to the breach of static ring skeleton one side, adopt spiral closed static ring to level up single spiral turn structure tip, the uneven possibility of taking place to discharge because of electric field distribution has significantly reduced, adopt the closed structure can effectively avoid the electric field shielding problem of static ring odd opening part, strengthen its anti-deformation ability. An oil duct cushion block 9 is additionally arranged between the self-adhesive transposed conductors 6 and used for adjusting the height of the coil and forming an oil duct, so that ampere-turn balance and heat dissipation are facilitated; a head outlet fixing stay bar 5 is arranged at the head outlet of the self-adhesive transposition wire 6, and is bound and fixed by a PET (polyethylene terephthalate) belt along the circumferential direction of the coil, so that the short-circuit resistance and the strength of the coil are improved. One of the self-adhesive transposed conductors 6 is connected with the copper stranded wire, the voltage regulating coil 4 is connected with the network side coil 3 according to drawing marks after being led out, and finally is connected with the switch, as shown in fig. 4, the voltage regulating coil wiring principle schematic diagram of the embodiment of the invention is shown, and the wiring modes are the prior art and are not repeated herein.
FIG. 5 is a schematic diagram of an embodiment of a spiral closed electrostatic ring; fig. 6 is a view of fig. 5 taken in direction D, according to an embodiment of the present invention. A helical closed electrostatic ring, comprising: the electrostatic ring comprises an electrostatic ring framework 10, a copper braided belt 11, a copper stranded wire 12 and an insulating layer 13. The electrostatic ring framework 10 is of a circular closed structure matched with the outer diameter of the single-spiral turn structure, the shape of one end of the electrostatic ring framework 10 is matched with the spiral height of the end face of the single-spiral turn structure, the outer side of the electrostatic ring framework 10 is sequentially wound and wrapped with a copper woven belt 11 and an insulating layer 13, the electrostatic ring framework 10 is made of laminated paper boards, and the insulating layer 13 is made of heat-resistant crepe paper. The electrostatic ring framework 10 determines the appearance of the electrostatic ring, so that the electrostatic ring can bear the press-mounting force; the electrostatic ring framework 10 adopts a mode that the upper end surface is horizontal, the lower end surface is matched with the spiral height of the upper surface of the single spiral turn structure, so that the generation of sharp corners caused by unequal distances between the lower surface of the electrostatic ring and the upper surface of the single spiral turn structure is avoided, and the distribution of electric fields at the end parts of the coil is effectively improved. The radial cross section of static ring skeleton 10 is the rectangle, and rectangle bight all sets up to the fillet, and the even winding of the half lap of copper braid over braid 11 is on static ring skeleton 10, and the winding of the half lap of insulating layer 13 is outside at copper braid over braid 11.
FIG. 7 is a cross-sectional view taken along line A-A of FIG. 5 in accordance with an embodiment of the present invention; FIG. 8 is a view from the B-B direction of FIG. 6 according to an embodiment of the present invention. Copper strands 12 are bent and embedded in the electrostatic ring framework 10 corresponding to the leading-out position of the voltage regulating coil, one end of each copper strand 12 is welded with the copper braided belt 11, and the other end of each copper strand 12 penetrates through the copper braided belt 11 and the insulating layer 13 to be led out and is connected with the first turn of wire cake at the end part of the single-spiral turn structure. The copper stranded wire 12 has a cross section of 4mm2The outer surface of the copper stranded wire 12 is wrapped with insulating paper, the copper stranded wire 12 is taken as an electrostatic ring outlet after going out of the electrostatic ring framework 10 and is connected with a single-spiral turn structure outlet, and the outer surface of the copper stranded wire 12 after going out of the electrostatic ring framework 10 is also wrapped with the insulating paper. Copper braid over braid 11 and 12 low silver brazes of copper strand wires, and the welding is accomplished the back, and insulating paper is wrapped to 12 surfaces of copper strand wires, and the smooth transition of laos bend has avoided the problem that copper strand wires 12 are broken, and the curved triangle area of laos is filled with insulating material, and the surface that is located the inside of electrostatic ring skeleton 10 and outside copper strand wires 12 all wraps insulating paper to need the insulation to wrap closely reality.
Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (9)
1. A design method of a flexible direct current transformer coil is characterized by comprising the following steps:
a single-spiral wire turn structure is wound by using a self-adhesive transposed conductor;
designing a spiral closed electrostatic ring structure, wherein the spiral closed electrostatic ring structure is oppositely arranged at the upper end part and the lower end part of a single-spiral turn structure, and the shape of one end of the spiral closed electrostatic ring is matched with the spiral height of a lead at the end part of the single-spiral turn structure;
an oil duct cushion block is additionally arranged between the wires of the single-spiral turn structure to form a voltage regulating coil;
and a valve side coil, a net side coil and a voltage regulating coil are sequentially arranged from the inside to the outside from the iron core to form the whole structure of the flexible direct current transformer coil.
2. The design method of the flexible direct current transformer coil according to claim 1, wherein a head fixing stay is arranged at a head of the lead, and a PET belt is used for binding and fixing along the circumferential direction of the voltage regulating coil.
3. A flexible dc transformer coil structure, wherein the design method of the flexible dc transformer coil according to claim 2 is applied, and comprises: the valve side coil (2), the net side coil (3) and the pressure regulating coil (4) are sequentially arranged from inside to outside from the iron core (1); the voltage regulating coil (4) comprises: the device comprises a head-outlet fixing stay (5), a self-adhesive transposition lead (6), an upper end spiral closed electrostatic ring (7), a lower end spiral closed electrostatic ring (8) and an oil duct cushion block (9), wherein the self-adhesive transposition lead (6) adopts eight axial leads and is wound to form a single spiral turn structure, the upper end part and the lower end part of the single spiral turn structure are respectively provided with the upper end spiral closed electrostatic ring (7) and the lower end spiral closed electrostatic ring (8), the shapes of one ends of the upper end spiral closed electrostatic ring (7) and the lower end spiral closed electrostatic ring (8) are matched with the spiral height of the end surface of the single spiral turn structure, the upper end spiral closed electrostatic ring (7) and the lower end spiral closed electrostatic ring (8) have the same structure and opposite assembly directions, the oil duct cushion block (9) is additionally arranged between the self-adhesive transposition leads (6), the head-outlet fixing stay (5) is arranged at the head-outlet position of the self-adhesive transposition lead (6), binding and fixing the coil by using a PET belt along the circumferential direction of the coil;
the spiral closed electrostatic ring comprises an electrostatic ring framework (10), a copper woven belt (11), a copper stranded wire (12) and an insulating layer (13); static ring skeleton (10) for the ring form closed structure with single spiral turn of wire structure external diameter matched with, the shape of the one end of static ring skeleton (10) and the high phase-match of single spiral turn of wire structure terminal surface spiral, the outside of static ring skeleton (10) twines parcel copper braid over braid (11) and insulating layer (13) in proper order, copper strand wires (12) laos are bent and are embedded in static ring skeleton (10) of corresponding single spiral turn of wire structure position department of going out, insulating paper is wrapped up to copper strand wires (12) surface, the one end and the copper braid over braid (11) welding of copper strand wires (12), the other end of copper strand wires (12) passes copper braid (11) and insulating layer (13) and draws forth, be connected with the first turn of wire cake of single spiral turn of wire structure tip.
4. The flexible direct current transformer coil structure according to claim 3, wherein the electrostatic ring framework (10) is made of laminated paper board, and the insulating layer (13) is made of heat-resistant crepe paper.
5. A flexible dc transformer coil structure according to claim 3, characterized in that the radial cross-section of the electrostatic ring bobbin (10) is rectangular, the corners of the rectangle being rounded.
6. A flexible dc transformer coil structure according to claim 3, wherein the copper braid (11) is wound around the electrostatic ring bobbin (10) in a half-lap manner, and the insulating layer (13) is wound around the copper braid (11) in a half-lap manner.
7. A flexible dc transformer coil structure according to claim 3, characterized in that the copper strands (12) are 4mm in cross-section2The bare copper conductor is characterized in that the outer surfaces of copper stranded wires (12) positioned inside and outside the electrostatic ring framework (10) are wrapped with insulating paper.
8. A flexible dc transformer coil structure according to claim 3, characterized in that the copper braid (11) is low silver brazed to the copper strands (12).
9. A flexible DC transformer coil structure according to claim 8, characterized in that the bends of the copper strands (12) are rounded off and the triangular areas of the bends are filled with insulating material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210029312.XA CN114446609A (en) | 2022-01-11 | 2022-01-11 | Design method and structure of flexible direct current transformer coil |
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| CN202210029312.XA CN114446609A (en) | 2022-01-11 | 2022-01-11 | Design method and structure of flexible direct current transformer coil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705470A (en) * | 2023-06-29 | 2023-09-05 | 国家电网有限公司 | Flexible-direct transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116705470A (en) * | 2023-06-29 | 2023-09-05 | 国家电网有限公司 | Flexible-direct transformer |
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