CN112216483A - Transformer and winding structure thereof - Google Patents
Transformer and winding structure thereof Download PDFInfo
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- CN112216483A CN112216483A CN202011072144.XA CN202011072144A CN112216483A CN 112216483 A CN112216483 A CN 112216483A CN 202011072144 A CN202011072144 A CN 202011072144A CN 112216483 A CN112216483 A CN 112216483A
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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
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
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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
- H01F27/32—Insulating of coils, windings, or parts thereof
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Abstract
The application provides a transformer and a winding structure thereof. In the winding structure of the transformer, a reinforced insulation winding, all basic insulation windings and all strong current windings are wound in a layered mode along a framework of a main structure of the transformer; and at least one basic insulation winding is respectively wound at the front and the back of the adjacent reinforced insulation winding, so that at least one basic insulation winding is wound between the reinforced insulation winding and any strong current winding, the insulation thickness between the strong current winding and the reinforced insulation winding is increased, and the discharge capacity of the transformer in a partial discharge test is reduced, so that the problem that in the prior art, the transformer in a photovoltaic high-voltage system cannot realize reinforced insulation due to the fact that partial discharge detection of the transformer cannot meet the partial discharge requirement easily is solved.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a transformer and a winding structure thereof.
Background
In the photovoltaic safety standard, the voltage with the decisive voltage level higher than DVC-A (direct current voltage is less than or equal to 60V, the effective value of alternating current voltage is less than or equal to 25V, and the peak of alternating current voltage is less than or equal to 35.4V) is regarded as unsafe voltage and called strong current for short; in practice, circuits that are directly connected to the heavy current or are separated only by functional insulation are likewise regarded as heavy current; in addition, if a human body directly contacts strong electricity, there is a danger of electric shock. Therefore, in consideration of human safety, a shell or a barrier CAN be added around the electric appliance, and a strong electric winding and a power supply winding for supplying power to a conductive component such as an external communication interface CAN be insulated, such as a power supply winding connected with an external communication interface (RS485 or CAN) in a photovoltaic inverter (the voltage of a battery plate group string is up to 1100Vdc or even 1500 Vdc).
Wherein, in order to avoid single failure and electric shock hazard, the insulation treatment can adopt reinforced insulation or double insulation. When the insulation treatment adopts reinforced insulation, the photovoltaic safety standard shows that the repetitive peak value of the working voltage across the insulation part is larger than 700V and the voltage stress on the insulation is larger than 1kV/mm, so that the isolation transformer for realizing reinforced insulation needs to meet the requirement of partial discharge, and partial discharge detection needs to be carried out on the transformer for realizing reinforced insulation among windings.
However, at present, the partial discharge detection of the transformer in the photovoltaic high-voltage system is difficult to meet the partial discharge requirement, so that the insulation strengthening can not be realized.
Disclosure of Invention
In view of this, the invention provides a transformer and a winding structure thereof, so as to solve the problem that in the prior art, a photovoltaic high-voltage system transformer cannot achieve insulation enhancement due to the fact that partial discharge detection of the transformer cannot meet the partial discharge requirement.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
an aspect of the present application provides a winding structure of a transformer, including: a reinforcing insulated winding, at least two basic insulated windings and at least one strong electric winding; wherein:
the reinforced insulation winding, all the basic insulation windings and all the strong current windings are wound in a layering mode along a framework of the main structure of the transformer;
and at least one basic insulated winding is wound at the front and the back of the reinforced insulated winding, which are adjacent to the reinforced insulated winding, so that at least one basic insulated winding is wound between the reinforced insulated winding and any strong current winding.
Optionally, when the number of the strong current windings is equal to 1:
the winding sequence of the strong current winding is prior to the reinforced insulation winding and the two adjacent basic insulation windings in front and at the back of the reinforced insulation winding; alternatively, the first and second electrodes may be,
the winding sequence of the reinforced insulated winding and the two adjacent basic insulated windings before and after the reinforced insulated winding is prior to that of the strong electric winding.
Optionally, when the number of the strong current windings is greater than or equal to 2:
the winding sequence of at least one strong electric winding is prior to the reinforced insulated winding and two adjacent basic insulated windings in front and at the back of the reinforced insulated winding; and/or the presence of a gas in the gas,
the winding sequence of the reinforced insulated winding and the two basic insulated windings which are adjacent to each other in front of and behind the reinforced insulated winding is prior to that of at least one strong electric winding.
Optionally, the insulated wires of the reinforced insulated winding and the basic insulated winding are three-layer insulated wires.
Optionally, the insulation wires of the reinforced insulation winding and the basic insulation winding are enameled wires or litz wires, and the outsides of the reinforced insulation winding and the litz wires are wrapped by insulation tapes.
Optionally, the insulated wire of the high-voltage winding is an enameled wire or a litz wire.
Optionally, the reinforced insulation winding, the basic insulation winding, and the strong current winding each include: at least one winding; all the windings are wound on the same layer.
Optionally, the reinforced insulation winding, the basic insulation winding, and the strong current winding each include: at least one winding; and when the number of the windings is more than 1, all the windings are wound into at least two layers.
Optionally, there is at least one said high current winding for taking electricity from a photovoltaic panel, an inverter dc bus or an ac grid;
at least one strong current winding is used for supplying power to a driving circuit or a power supply chip;
the basic insulated winding is used for supplying power to a control system of the inverter;
and the reinforced insulation winding is used for supplying power to an external communication interface and a dry node interface in the inverter.
Optionally, if there is only one load on the basic insulated winding, the output ends of the two basic insulated windings are connected in parallel, or the output end of one basic insulated winding is suspended.
Another aspect of the present application provides a transformer, including: a main structure and a winding structure of a transformer as described in any of the above.
Optionally, the main structure at least comprises a framework and at least one group of retaining walls; wherein:
the retaining wall is arranged between the framework and the corresponding winding.
According to the technical scheme, the invention provides a winding structure of a transformer. The reinforced insulation winding, all the basic insulation windings and all the strong current windings are wound along the framework of the main structure of the transformer in a layering manner; and at least one basic insulation winding is respectively wound at the front and the back of the adjacent reinforced insulation winding, so that at least one basic insulation winding is wound between the reinforced insulation winding and any strong current winding, the insulation thickness between the strong current winding and the reinforced insulation winding is increased, and the discharge capacity of the transformer in a partial discharge test is reduced, so that the problem that in the prior art, the transformer in a photovoltaic high-voltage system cannot realize reinforced insulation due to the fact that partial discharge detection of the transformer cannot meet the partial discharge requirement easily is solved.
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 is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of partial discharge detection;
fig. 2-15 are schematic diagrams illustrating fourteen winding manners of a winding structure of a transformer according to an embodiment of the present application;
fig. 16 is a winding structure of a transformer in the prior art;
fig. 17 is a schematic diagram of a reinforced insulation power supply scheme of a photovoltaic high-voltage system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As is known from the background art, a transformer for realizing enhanced insulation between windings and partial discharge detection are required. As shown in fig. 1, the first stage of the partial discharge detection is: 1.875 times of maximum is applied to the primary side and the secondary side of the transformer for realizing enhanced insulation between windingsRepetitive peak voltage UPDThe time is maintained for 5 s; the second stage is as follows: applying 1.5 times of maximum repeated peak voltage U to primary side and secondary side of the transformerPDAnd maintaining for 15s, and simultaneously measuring the partial discharge charge quantity of the transformer, and if the partial discharge charge quantity is less than 10pC, determining that the transformer meets the partial discharge requirement.
However, in the prior art, the transformer in the photovoltaic high-voltage system cannot achieve enhanced insulation because the partial discharge detection of the transformer is difficult to meet the partial discharge requirement. In order to solve the problem, an embodiment of the present application provides a winding structure of a transformer, including: a reinforcing insulated winding, at least two basic insulated windings and at least one strong electric winding.
The number of the basic insulated windings and the number of the strong current windings are selected according to actual conditions, and are not specifically limited herein and are within the protection scope of the application.
It should be noted that the reinforced insulation winding is a winding for realizing reinforced insulation with the strong current winding, and in practical application, the reinforced insulation winding can be connected with external conductive devices such as an external communication interface and a dry node interface in the inverter and supply power to the external conductive devices; the basic insulation winding is a winding which realizes basic insulation with a strong current winding, and in practical application, the basic insulation winding can be connected with a control system in the inverter to supply power for the inverter and can be regarded as a weak current winding; the strong current winding is a winding for receiving or outputting strong current, can get electricity from a photovoltaic cell panel, an inverter direct current bus or an alternating current power grid, or can supply power for a driving circuit or a power chip.
In the winding structure of the transformer, a reinforced insulation winding, all basic insulation windings and all strong current windings are wound along the framework of the main structure of the transformer in a layered mode, and in the winding process of all the windings, at least one basic insulation winding is wound in the front and at the back of the reinforced insulation winding and is close to the reinforced insulation winding, so that at least one basic insulation winding is wound between the reinforced insulation winding and any strong current winding.
As can be seen from the above description, in the winding structure of the transformer provided in this embodiment, at least one basic insulation winding is respectively wound around the front and the back of the winding structure, so that at least one basic insulation winding is wound between the reinforcing insulation winding and any strong electric winding, that is, the reinforcing insulation winding is spaced from any strong electric winding, so that the insulation thickness between the strong electric winding and the reinforcing insulation winding is increased, and a significant effect is further provided for reducing the discharge amount of the partial discharge test of the transformer, thereby solving the problem that the transformer in the photovoltaic high voltage (700V +) system cannot achieve the partial discharge requirement due to the difficulty in detecting the partial discharge of the transformer itself, and cannot achieve the insulation reinforcement.
It should be noted that in the prior art, in order to make the transformer meet the partial discharge requirement, a potting glue process may be generally adopted, or a skeleton with a larger size and a higher relative Tracking Index (CTI) grade may be customized; however, the above measures not only increase the difficulty of the transformer production process, but also increase the volume, weight and cost of the transformer.
The winding structure of the transformer provided by the embodiment does not need to carry out potting glue treatment on the transformer, does not need to customize a transformer framework with larger size and higher CTI (tracking index) grade, and winds the primary side winding and the secondary side winding of the transformer by adopting three layers of insulated wires, and has obvious effect on reducing the discharge capacity of the partial discharge test of the transformer by only reasonably arranging the winding sequence of each winding, so that the winding structure of the transformer realizes the simplification of a power supply scheme and the reduction of a production process, and has obvious gain effect on optimizing the volume, the weight and the cost of the transformer.
It should be further noted that, in the prior art, the primary winding and the secondary winding of the transformer are both wound by using three layers of insulated wires, and in the winding structure of the transformer provided in this embodiment, the insulated wires of the reinforced insulated winding and the basic insulated winding may be three layers of insulated wires, or may be enameled wires wrapped with an insulated tape, or litz wires wrapped with an insulated tape. In addition, the insulated wire of the high-voltage winding only adopts an enameled wire or a litz wire, and in practical application, the insulated wire includes but is not limited to the above-mentioned insulating material, and the insulated wire is not specifically limited herein, and is within the protection scope of the present application, and may be determined according to specific situations.
It should be noted that, when the insulated wire of the reinforced insulated winding or the basic insulated winding is: when the enameled or litz wire is wrapped with the insulating tape, the thickness or the number of layers of the insulating tape wrapped outside can be determined according to the partial discharge effect, and the thickness or the number of layers is not particularly limited and is within the protection scope of the application.
Optionally, the reinforced insulation winding, the basic insulation winding and the high voltage winding may each include: at least one winding, and all the windings can be wound on the same layer along the main structure skeleton of the transformer; and when the number of the windings is more than 1, all the windings can be wound on the main structure framework of the transformer in at least two layers; it is not specifically limited herein, and may be within the scope of the present application depending on the specific circumstances.
In practical application, on the premise that at least one basic insulation winding is wound respectively in front and at back of the reinforced insulation winding adjacent to the reinforced insulation winding, so that at least one basic insulation winding is wound between the reinforced insulation winding and any strong current winding, the winding structure of the transformer has multiple winding modes, and another embodiment of the application provides three winding modes, specifically as follows:
the winding sequence of all strong electric windings is at least prior to the reinforced insulated winding and two adjacent basic insulated windings.
(1) The number of strong current windings being equal to 1
When the number of the basic insulation windings is equal to 2, the winding mode specifically comprises the following steps: the strong electric winding is adjacent to and wound before the reinforced insulating winding and the two basic insulating windings which are adjacent to each other in front of and behind the reinforced insulating winding. As shown in fig. 2, the winding structures of the transformers each include: in the winding structure of the transformer, the windings sequentially wound from inside to outside along the framework of the transformer are respectively as follows: a strong electric winding Np, a first basic insulation winding Ns1, a reinforced insulation winding NSs and a second basic insulation winding Ns 2.
When the number of the basic insulation windings is more than 2, the winding mode specifically comprises the following steps: the strong electric winding is wound before the reinforced insulating winding and the two basic insulating windings which are adjacent to each other in front and back, and the other basic insulating windings except the two basic insulating windings which are adjacent to each other in front and back can be wound next to and in front of the strong electric winding, as shown in FIG. 3; it is also possible to wind immediately after the strong current winding, as shown in fig. 4; it may also be spaced apart from and wound after the strong current winding as shown in fig. 5.
The winding structures of the transformers shown in fig. 3, 4 and 5 each include: in the winding structure of the transformer shown in fig. 3, the windings sequentially wound from inside to outside along the transformer bobbin are respectively: a first basic insulation winding Ns1, a strong electric winding Np, a second basic insulation winding Ns2, a reinforced insulation winding NSs and a third basic insulation winding Ns 3; in the winding structure of the transformer shown in fig. 4, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a strong electric winding Np, a first basic insulation winding Ns1, a second basic insulation winding Ns2, a reinforced insulation winding NSs and a third basic insulation winding Ns 3; in the winding structure of the transformer shown in fig. 5, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a strong electric winding Np, a first basic insulation winding Ns1, a reinforced insulation winding NSS, a second basic insulation winding Ns2 and a third basic insulation winding Ns 3.
It should be noted that, except for two basic insulated windings adjacent to each other before and after the reinforced insulated winding, each of the other basic insulated windings may adopt the same winding manner or different winding manners, that is, may be disposed at any position, and is not specifically limited herein, and the selection is performed according to the actual condition of each of the other basic insulated windings, and is within the protection scope of the present application.
(2) The number of strong current windings is more than 1
When the number of the basic insulation windings is equal to 2, the winding mode specifically comprises the following steps: all the strong current windings are wound next to each other in sequence, and the reinforced insulating winding and the two basic insulating windings which are next to each other in front of and behind the reinforced insulating winding are wound next to and behind all the strong current windings. As shown in fig. 6, the winding structures of the transformers each include: in the winding structure of the transformer, the windings sequentially wound from inside to outside along the framework of the transformer are respectively as follows: a first strong electric winding Np1, a second strong electric winding Np2, a first basic insulation winding Ns1, a reinforced insulation winding NSS and a second basic insulation winding Ns 2.
When the number of the basic insulation windings is more than 2, the winding mode specifically comprises the following steps: all strong electric windings are wound before the reinforced insulated winding and two basic insulated windings immediately before and after the reinforced insulated winding. And each of the remaining basic insulated windings, except for the two basic insulated windings immediately before and after the reinforced insulated winding, may be wound immediately before and immediately after all of the strong electric windings, as shown in fig. 7; may be wound immediately adjacent to and after all the strong current windings, as shown in fig. 8; or between any two strong current windings, as shown in fig. 9; it is also possible to space and wind after all the strong electric windings, as shown in fig. 10.
The winding structures of the transformers shown in fig. 7, 8, 9 and 10 each include: a reinforced insulated winding, three basic insulated windings and two strong current windings; in the winding structure of the transformer shown in fig. 7, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a first basic insulated winding Ns1, a first strong electric winding Np1, a second strong electric winding Np2, a second basic insulated winding Ns2, a reinforced insulated winding NSS and a third basic insulated winding Ns 3; in the winding structure of the transformer shown in fig. 8, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a first strong electric winding Np1, a second strong electric winding Np2, a first basic insulation winding Ns1, a second basic insulation winding Ns2, a reinforced insulation winding NSS and a third basic insulation winding Ns 3; in the winding structure of the transformer shown in fig. 9, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a first strong electric winding Np1, a first basic insulation winding Ns1, a second strong electric winding Np2, a second basic insulation winding Ns2, a reinforced insulation winding NSS and a third basic insulation winding Ns 3; in the winding structure of the transformer shown in fig. 10, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a first strong electric winding Np1, a second strong electric winding Np2, a first basic insulation winding Ns1, a reinforced insulation winding NSS, a second basic insulation winding Ns2 and a third basic insulation winding Ns 3.
It should be noted that, except for two basic insulated windings adjacent to each other before and after the reinforced insulated winding, each of the other basic insulated windings may adopt the same winding manner or different winding manners, that is, may be disposed at any position, and is not specifically limited herein, and the selection is performed according to the actual condition of each of the other basic insulated windings, and is within the protection scope of the present application.
And secondly, the winding sequence of all the strong electric windings is at least behind the reinforced insulating winding and two adjacent basic insulating windings in front and at the back of the reinforced insulating winding.
It should be noted that the winding manner is different from the above winding manner only in that the order of the reinforced insulation winding, the two basic insulation windings immediately before and after the reinforced insulation winding, and all the strong current windings is strengthened, so that various specific embodiments in the winding manner are the same as the above winding manner, and various specific embodiments of the winding manner can be derived by referring to the specific description process of the winding manner, and thus, the description thereof is omitted here.
And thirdly, the winding sequence of one part of the strong electric winding at least precedes the reinforced insulated winding and the two basic insulated windings which are adjacent to each other in front and at the back, and the winding sequence of the other part of the strong electric winding at least lags behind the reinforced insulated winding and the two basic insulated windings which are adjacent to each other in front and at the back.
In this case, the number of the strong current windings is always larger than 1.
When the number of the basic insulation windings is equal to 2, the winding mode specifically comprises the following steps: a part of strong current windings are wound closely and sequentially, and the reinforced insulation winding and two adjacent basic insulation windings are wound closely and sequentially after the reinforced insulation winding; another part of the strong current windings are wound closely in sequence, the reinforcing insulating winding and two adjacent basic insulating windings in front of and behind the reinforcing insulating winding are wound closely to the part of the strong current windings, and as shown in fig. 11, the winding structure of the transformer comprises: a reinforced insulated winding, two basic insulated windings and two strong current windings; in the winding structure of the transformer, the windings wound along the framework of the transformer from inside to outside are respectively as follows: a first strong electric winding Np1, a first basic insulation winding Ns1, a strengthening insulation winding NSs, a second basic insulation winding Ns2 and a second strong electric winding Np 2.
When the number of the basic insulation windings is more than 2, the winding mode specifically comprises the following steps: one part of the strong electric winding is wound before the reinforced insulated winding and the two basic insulated windings which are adjacent to each other in front and back, the other part of the strong electric winding is wound after the reinforced insulated winding and the two basic insulated windings which are adjacent to each other in front and back, and the other basic insulated windings except the two basic insulated windings which are adjacent to each other in front and back can be wound in front of and next to any part of the strong electric winding, as shown in figure 12; can be wound immediately adjacent to and after any part of the strong electric winding, as shown in fig. 13; it can also be wound between any two strong current windings as shown in fig. 14.
Fig. 12, fig. 13 and fig. 14 are all shown by taking the example that the other basic insulation windings are adjacent to the previous strong electric winding, and the practical application is not limited to this. The winding structure of the transformer comprises: a reinforced insulated winding, three basic insulated windings and three strong current windings; in the winding structure of the transformer shown in fig. 12, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a first basic insulation winding Ns1, a first strong electric winding Np1, a second strong electric winding Np2, a second basic insulation winding Ns2, a reinforced insulation winding NSS, a third basic insulation winding Ns3 and a third strong electric winding Np 3; in the winding structure of the transformer shown in fig. 13, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a first strong electric winding Np1, a second strong electric winding Np2, a first basic insulation winding Ns1, a second basic insulation winding Ns2, a reinforced insulation winding NSS, a third basic insulation winding Ns3 and a third strong electric winding Np 3; in the winding structure of the transformer shown in fig. 14, the windings wound in sequence from inside to outside along the transformer bobbin are respectively: a first strong electric winding Np1, a first basic insulation winding Ns1, a second strong electric winding Np2, a second basic insulation winding Ns2, a reinforced insulation winding NSS, a third basic insulation winding Ns3 and a third strong electric winding Np 3.
It should be noted that, except for two basic insulated windings adjacent to each other before and after the reinforced insulated winding, each of the other basic insulated windings may adopt the same winding manner or different winding manners, that is, may be disposed at any position, and is not specifically limited herein, and the selection is performed according to the actual condition of each of the other basic insulated windings, and is within the protection scope of the present application.
It should be noted that, the three winding manners of the above-mentioned strong electric winding may be selected according to specific application conditions, and are not specifically limited herein, and all of them are within the protection scope of the present application.
In order to verify whether the winding structure of the transformer provided by the embodiment of the present application has a significant effect on the reduction of the discharge amount in the partial discharge test of the transformer, the winding structures of the transformer shown in fig. 15 and 16 are subjected to the partial discharge test, respectively.
Wherein, the winding structure of the transformer shown in fig. 15 and 16 includes: a first strong electric main winding Np1-1, a first strong electric auxiliary winding Np1-2, a second strong electric winding Np2, a third strong electric winding Np3, a first basic insulating winding Ns1, a second basic insulating winding Ns2 and a strengthening insulating winding NSS; fig. 15 shows a winding structure of the transformer provided in the present application, where the windings sequentially wound along the transformer bobbin from inside to outside are: a first strong electric main winding Np1-1, a first strong electric auxiliary winding Np1-2, a first basic insulating winding Ns1, a reinforced insulating winding NSS, a second basic insulating winding Ns2, a second strong electric winding Np2 and a third strong electric winding Np 3; fig. 16 is a comparison scheme, and the winding structure of the transformer provided by the present application is not adopted, and there is a difference between the winding position of the reinforced insulation winding Nss and fig. 15, and the windings sequentially wound from inside to outside along the transformer skeleton are respectively: the high-voltage motor comprises a first high-voltage main winding Np1-1, a first high-voltage auxiliary winding Np1-2, a first basic insulating winding Ns1, a second basic insulating winding Ns2, a strengthening insulating winding NSS, a second high-voltage winding Np2 and a third high-voltage winding Np 3.
TABLE 1 partial discharge test results
Table 1 shows the results of the tests performed on the transformer having the structure shown in fig. 15 and 16, in which the partial discharge test was performed according to the 1100V system voltage and the 1500V system voltage, and it can be seen from table 1 that the transformer having the structure shown in fig. 15 has the measured partial discharge charge amount of less than 2pC, and much less than 10pC specified by the standard, both at the 1100V system voltage and the 1500V system voltage, and satisfies the partial discharge requirement.
The actually measured partial discharge charge quantity of the transformer with the structure shown in fig. 16 exceeds 10pC under 1100V system voltage, and exceeds 20pC under 1500V system voltage, which are both larger than the standard specification and do not meet the partial discharge requirement.
Therefore, the winding structure of the transformer has a remarkable effect of reducing the discharge capacity of the partial discharge test of the transformer.
Another embodiment of the present application provides a reinforced insulation power supply scheme for a photovoltaic high-voltage system, where the power supply is designed according to the winding structure of the transformer provided in the above embodiments of the present application.
As shown in fig. 17, the Np1 winding includes Np1-1 and Np1-2, and the Np1 winding can take power from a photovoltaic panel, an inverter dc bus, and an ac power grid, and the specific form is not limited.
The Np2 winding and the Np3 winding are directly connected with the Np1 winding or are separated by functional insulation, so that the Np2 winding and the Np3 winding are strong electric windings; the Np2 winding is a winding for supplying power to a Boost and/or INV module and/or a single tube drive in the inverter, and the Np2 winding may be one winding or multiple windings, and the specific number is not limited; the Np3 winding is the winding that supplies the auxiliary power chip VCC.
The Ns1 winding and the Ns2 winding are used for supplying power to a control system in an inverter and the like, and satisfy basic insulation with the Np1 winding, so the Ns1 winding and the Ns2 winding are basic insulation windings and can be regarded as weak current.
The NSS winding supplies power to external interfaces such as external communication and dry nodes in the inverter, and meets the requirement of reinforced insulation with the winding Np1, so the NSS winding is a reinforced insulation winding and is regarded as weak current.
It should be noted that, in the prior art, the insulation treatment performed on the strong current winding and the power supply winding for supplying power to the conductive parts such as the external communication interface may be double insulation, and although the double insulation may also be adopted to avoid the direct contact of the human body with the strong current, the double insulation circuit occupies a large volume and space, and has a high cost; the power supply scheme can effectively save a second-stage power supply in the scheme, so that the auxiliary power supply scheme of the whole system is simplified, and the power supply scheme has obvious gain effects on the size, weight and cost optimization of the transformer.
It should be further noted that, when the number of basic insulated windings in the system is less than 2, that is, when there is only one load in the basic insulated windings in the system, the output ends of two basic insulated windings adjacent to the reinforced insulated winding, such as the Ns1 winding and the Ns2 winding, may be connected in parallel to form a high-power supply port, or the output end of any one of the two windings may be suspended to serve as a standby power supply port for later expansion; it is not specifically limited herein, and may be within the scope of the present application depending on the specific circumstances. That is, in the winding structure, there are at least two substantially insulated winding outputs connected in parallel; and/or the output end of at least one basic insulated winding is suspended, so that the reinforced insulated winding can be clamped between the two basic insulated windings, and the insulation thickness of the strong current winding and the reinforced insulated winding is increased.
Another embodiment of the present application provides a transformer, which includes: a main structure and a winding structure of a transformer as provided in the above embodiments.
Specifically, the main structure of the transformer at least comprises a framework and at least one group of retaining walls, wherein the retaining walls are respectively placed on the left side and the right side of the winding to form a group of retaining walls, the retaining walls are arranged between the framework and the corresponding winding and used for increasing the safety distance, particularly the distance between the strong current winding and the magnetic core, so that the winding of each winding meets the safety requirements, the potential safety hazard of electric power can be avoided, and the electric safety of the transformer is guaranteed.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (12)
1. A winding structure of a transformer, comprising: a reinforcing insulated winding, at least two basic insulated windings and at least one strong electric winding; wherein:
the reinforced insulation winding, all the basic insulation windings and all the strong current windings are wound in a layering mode along a framework of the main structure of the transformer;
and at least one basic insulated winding is wound at the front and the back of the reinforced insulated winding, which are adjacent to the reinforced insulated winding, so that at least one basic insulated winding is wound between the reinforced insulated winding and any strong current winding.
2. The winding structure of a transformer according to claim 1, wherein when the number of the strong electric windings is equal to 1:
the winding sequence of the strong current winding is prior to the reinforced insulation winding and the two adjacent basic insulation windings in front and at the back of the reinforced insulation winding; alternatively, the first and second electrodes may be,
the winding sequence of the reinforced insulated winding and the two adjacent basic insulated windings before and after the reinforced insulated winding is prior to that of the strong electric winding.
3. The winding structure of a transformer according to claim 1, wherein when the number of the strong electric windings is 2 or more:
the winding sequence of at least one strong electric winding is prior to the reinforced insulated winding and two adjacent basic insulated windings in front and at the back of the reinforced insulated winding; and/or the presence of a gas in the gas,
the winding sequence of the reinforced insulated winding and the two basic insulated windings which are adjacent to each other in front of and behind the reinforced insulated winding is prior to that of at least one strong electric winding.
4. The winding structure of a transformer according to any one of claims 1 to 3, wherein the insulated wires of the reinforcing insulated winding and the primary insulated winding are triple-layer insulated wires.
5. The winding structure of a transformer according to any one of claims 1 to 3, wherein the insulated wires of the reinforced insulated winding and the basic insulated winding are enameled wires or litz wires, and both are externally wrapped with an insulating tape.
6. The winding structure of a transformer according to any one of claims 1 to 3, wherein the insulated wire of the high-voltage winding is an enameled wire, or a litz wire.
7. The winding structure of a transformer according to any one of claims 1 to 3, wherein the reinforcing insulated winding, the basic insulated winding and the strong electric winding each comprise: at least one winding; all the windings are wound on the same layer.
8. The winding structure of a transformer according to any one of claims 1 to 3, wherein the reinforcing insulated winding, the basic insulated winding and the strong electric winding each comprise: at least one winding; and when the number of the windings is more than 1, all the windings are wound into at least two layers.
9. A winding arrangement for a transformer according to any of claims 1-3, characterized in that there is at least one said strong electric winding for taking electricity from a photovoltaic panel, an inverter dc bus or an ac grid;
at least one strong current winding is used for supplying power to a driving circuit or a power supply chip;
the basic insulated winding is used for supplying power to a control system of the inverter;
and the reinforced insulation winding is used for supplying power to an external communication interface and a dry node interface in the inverter.
10. The winding structure of the transformer according to any one of claims 1 to 3, wherein if there is only one load on the basic insulated windings, the output terminals of two basic insulated windings are connected in parallel, or the output terminal of one basic insulated winding is floating.
11. A transformer, comprising: a main structure and a winding structure of a transformer according to any of claims 1-10.
12. The transformer according to claim 11, wherein the primary structure comprises at least a framework and at least one set of retaining walls; wherein:
the retaining wall is arranged between the framework and the corresponding winding.
Priority Applications (2)
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|---|---|---|---|
| CN202011072144.XA CN112216483B (en) | 2020-10-09 | 2020-10-09 | Transformer and winding structure thereof |
| PCT/CN2021/116647 WO2022073405A1 (en) | 2020-10-09 | 2021-09-06 | Transformer and winding structure thereof |
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| CN202011072144.XA CN112216483B (en) | 2020-10-09 | 2020-10-09 | Transformer and winding structure thereof |
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| CN112216483B CN112216483B (en) | 2022-04-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022073405A1 (en) * | 2020-10-09 | 2022-04-14 | 阳光电源股份有限公司 | Transformer and winding structure thereof |
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| WO2022073405A1 (en) | 2022-04-14 |
| CN112216483B (en) | 2022-04-08 |
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