Low-voltage three-split structure and transformer

Abstract

The utility model provides a low-voltage three-split structure and a transformer, the low-voltage three-split structure comprises a first low-voltage winding, a second low-voltage winding and a third low-voltage winding, the first low-voltage winding, the second low-voltage winding and the third low-voltage winding have the same voltage class and rated capacity; each of the first low-voltage winding, the second low-voltage winding and the third low-voltage winding adopts a spiral structure; the transformer comprises an iron core, a high-voltage winding and the low-voltage three-split structure, and the first low-voltage winding, the second low-voltage winding, the third low-voltage winding and the high-voltage winding of the low-voltage three-split structure are wound on the iron core. Power transmission during high-voltage and medium-voltage operation of a conventional power transformer can be realized, and the requirements of high-voltage and low-voltage full-ride-through and half-ride-through operation and medium-voltage and low-voltage full-ride-through and half-ride-through operation can be met; the multi-purpose operation requirement is met, the operation efficiency is high, and safety and reliability are achieved.

Description

Technical Field

[0001] The utility model embodiment relates to the technical field of transformers, and in particular to a low-voltage three-split structure and a transformer. Background Art

[0002] The new energy industry is booming, especially photovoltaic and wind power projects are growing rapidly. The new power generation mode has put forward higher requirements for transformers to cope with complex and changeable power systems, and transformers with multiple functions and multiple operating modes have emerged. The traditional low-voltage axially split low-voltage double-split structure transformer has only two voltages, high voltage and low voltage, and the winding method of the low-voltage structure winding is simple, and its power transmission method and function are relatively simple. Utility Model Content

[0003] The embodiment of the utility model provides a low-voltage three-split structure and a transformer, thereby solving the problem of a relatively single power transmission mode and function.

[0004] In order to solve the above technical problems, the utility model is achieved as follows:

[0005] In the first aspect, an embodiment of the utility model provides a low-voltage three-split structure, including: a first low-voltage winding, a second low-voltage winding and a third low-voltage winding; the voltage level and rated capacity of the first low-voltage winding, the second low-voltage winding and the third low-voltage winding are the same; the first low-voltage winding, the second low-voltage winding and the third low-voltage winding all adopt a spiral structure.

[0006] Optionally, the helical structure includes a single helix and a multiple helix.

[0007] Optionally, when the first low-voltage winding, the second low-voltage winding and the third low-voltage winding are radially wound with one wire, the first low-voltage winding and the third low-voltage winding are transposed at a middle incoming line position.

[0008] Optionally, when the first low-voltage winding, the second low-voltage winding and the third low-voltage winding are wound in parallel using two self-adhesive transposition wires, the wires of the first low-voltage winding, the second low-voltage winding and the third low-voltage winding are transposed at the 3 / 4 position of the first low-voltage winding, the first low-voltage winding and the third low-voltage winding are transposed at the 1 / 2 position of the first low-voltage winding, the wire of the second low-voltage winding is transposed at the 1 / 2 position of the first low-voltage winding, and the wires of the first low-voltage winding, the second low-voltage winding and the third low-voltage winding are transposed at the 1 / 4 position of the first low-voltage winding.

[0009] Optionally, the first low-voltage winding, the second low-voltage winding and the third low-voltage winding adopt a central line-in structure, and / or the turns and oil passage arrangements of the first low-voltage winding, the second low-voltage winding and the third low-voltage winding are axially symmetrical.

[0010] In the second aspect, an embodiment of the utility model provides a transformer, comprising: an iron core, a high-voltage winding and the above-mentioned low-voltage three-split structure, wherein the first low-voltage winding, the second low-voltage winding, the third low-voltage winding and the high-voltage winding of the low-voltage three-split structure are all wound on the iron core.

[0011] Optionally, the high-voltage winding adopts an end-line entry structure or a middle-line entry structure.

[0012] Optionally, the transformer further includes: a medium voltage winding, the medium voltage winding adopts an end-in-line structure, and the medium voltage winding is wound on the iron core.

[0013] Optionally, the transformer further includes: a high voltage regulating winding for regulating voltage, and / or a medium voltage regulating winding;

[0014] The arrangement of the high voltage regulating winding and the medium voltage regulating winding includes radial arrangement and axial arrangement. The high voltage regulating winding and the medium voltage regulating winding are wound on the iron core.

[0015] Optionally, the first low voltage winding, the second low voltage winding, the third low voltage winding and the high voltage winding are all star-connected, or, when the first low voltage winding, the second low voltage winding, the third low voltage winding, the medium voltage winding and the high voltage winding are all star-connected, the low voltage three-split structure also includes a stabilizing winding for reducing zero-sequence impedance, and the stabilizing winding is wound on the iron core.

[0016] Optionally, the arrangement of the turns and oil channels of the first low-voltage winding, the second low-voltage winding, the third low-voltage winding, the medium-voltage winding and the high-voltage winding are all axially symmetrical.

[0017] The embodiments of the present utility model have the following beneficial effects:

[0018] 1. It can realize power transmission when conventional power transformers are in high and medium voltage operation, and can also meet the requirements of high and low voltage full-through, half-through operation, as well as medium and low voltage full-through, half-through operation.

[0019] 2. Power can be transmitted from one low voltage, two low voltages or three low voltage sides to the high voltage or medium voltage side, or from one low voltage, two low voltages or three low voltage sides to the high voltage and medium voltage sides at the same time, meeting multi-purpose operation requirements, with high operation efficiency, safety and reliability.

[0020] 3. Since power can be transmitted from the low voltage to the high voltage and medium voltage sides at the same time, the number of conventional low voltage axial split transformers can be reduced during construction, reducing construction land and saving construction funds.

[0021] 4. Since the low voltage adopts a three-split structure, the capacity of the low-voltage line is reduced by increasing the number of low-voltage branches, which reduces the requirements for circuit breakers, switches and other equipment in the line. At the same time, one transformer can be connected to three low-voltage power supply points at the same time, which can reduce the number of main transformers used for on-site voltage boosting, reduce construction land, and save construction funds. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0023] Figure 1 A schematic diagram of a low-pressure three-splitting structure provided by an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the structure of a transformer including a high-voltage voltage regulating winding provided in an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of a transformer structure including a stabilizing winding provided in an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of a transformer with a separate structure including a high voltage regulating winding and a medium voltage regulating winding provided in an embodiment of the utility model;

[0027] Figure 5 A schematic diagram of transposition when two self-adhesive transposition conductors are wound in parallel in a low-voltage three-split structure provided by an embodiment of the utility model;

[0028] Figure 6 A schematic diagram of the operating conditions of a first low-voltage winding and a high-voltage winding of a low-voltage three-split structure provided by an embodiment of the utility model;

[0029] Figure 7 A schematic diagram of the operating conditions of a third low-voltage winding and a high-voltage winding of a low-voltage three-split structure provided by an embodiment of the utility model;

[0030] Figure 8 A schematic diagram of the operating conditions of a first low-voltage winding, a second low-voltage winding and a high-voltage winding of a low-voltage three-split structure provided by an embodiment of the utility model;

[0031] Fig. 9 A schematic diagram of the operating conditions of a second low-voltage winding, a third low-voltage winding and a high-voltage winding of a low-voltage three-split structure provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1-Figure 9 As shown, a low-voltage three-split structure includes: a first low-voltage winding 1, a second low-voltage winding 2 and a third low-voltage winding 3; the voltage level and rated capacity of the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 are the same; the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 all adopt a spiral structure. The first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 are wound at the same time, and the wires are separated by insulating pads or molded stays. The low-voltage three-split structure can meet the multi-purpose operation requirements, has high operation efficiency, and is safe and reliable. The spiral structure can improve the heat dissipation efficiency, reduce vibration and noise, improve the insulation performance, simplify the manufacturing process and increase the capacity density, thereby improving the performance and reliability of the transformer.

[0034] Optionally, the spiral structure includes a single spiral and a multi-spiral structure. The single spiral structure is relatively simple, easy to design and manufacture, and convenient to install and maintain; the multi-spiral structure can increase the heat dissipation and heat transfer surface area, which is conducive to heat dissipation, reduces temperature rise, improves heat transfer efficiency, and improves the stability and reliability of the equipment.

[0035] Optionally, when the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 are wound radially with one wire, the first low-voltage winding 1 and the third low-voltage winding 3 are transposed at the middle incoming line position. Transposition can optimize the electromagnetic coupling between the windings, improve the electromagnetic performance of the transformer, reduce the circulating current loss inside the coil, and improve efficiency.

[0036] like Figure 5As shown, optionally, when the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 are wound in parallel using two self-adhesive transposition wires, the wires of the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 are transposed at the 3 / 4 position of the first low-voltage winding 1, the first low-voltage winding 1 and the third low-voltage winding 3 are transposed at the 1 / 2 position of the first low-voltage winding 1, the wire of the second low-voltage winding 2 is transposed at the 1 / 2 position of the first low-voltage winding 1, and the wires of the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 are transposed at the 1 / 4 position of the first low-voltage winding 1. It not only ensures the insulation requirements between the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 and reduces the circulating current loss, but also can meet the requirements that the short-circuit impedance between the high-voltage winding 4 and the first low-voltage winding 1, the high-voltage winding 4 and the second low-voltage winding 2, and the high-voltage winding 4 and the third low-voltage winding 3 are equal, as well as the short-circuit impedance between the medium-voltage winding 5 and the first low-voltage winding 1, the medium-voltage winding 5 and the second low-voltage winding 2, and the medium-voltage winding 5 and the third low-voltage winding 3 are equal.

[0037] Optionally, the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 adopt a central line-in structure, and / or the turns and oil passages of the first low-voltage winding 1, the second low-voltage winding 2 and the third low-voltage winding 3 are arranged in an axially symmetrical manner. The central line-in structure can help evenly distribute the current, reduce local hot spots in the winding, and improve the stability of the transformer; the axially symmetrical arrangement can help maintain the uniformity of the magnetic field, reduce magnetic field leakage and magnetic loss, and improve the efficiency of the transformer.

[0038] In the second aspect, the embodiment of the utility model provides a transformer, comprising: an iron core, a high-voltage winding 4 and the above-mentioned low-voltage three-split structure, wherein the first low-voltage winding 1, the second low-voltage winding 2, the third low-voltage winding 3 and the high-voltage winding 4 of the low-voltage three-split structure are all wound on the iron core. The transformer adopts a low-voltage three-split structure, can meet the multi-purpose operation requirements, has high operation efficiency, and is safe and reliable.

[0039] Optionally, the high-voltage winding 4 adopts an end-feed structure or a middle-feed structure. The end-feed structure can simplify the design of the transformer, reduce the number of components, and reduce manufacturing costs; the middle-feed structure can help evenly distribute the current, reduce local hot spots in the winding, and improve the stability of the transformer.

[0040] Optionally, the transformer further includes: a medium voltage winding 5, the medium voltage winding 5 adopts an end-in-line structure, and the medium voltage winding 5 is wound on the iron core. The windings of the transformer are arranged from the iron core outward in sequence as follows: iron core—first low voltage winding 1, second low voltage winding 2, third low voltage winding 3 wound simultaneously—medium voltage winding 5—high voltage winding 4. The end-in-line structure can simplify the design of the transformer, reduce the number of components, and reduce manufacturing costs; the end-in-line structure can reduce magnetic resistance and improve the efficiency of the transformer.

[0041] like Figure 2 and Figure 4 As shown, optionally, the transformer also includes: a high-voltage regulating winding 6 for regulating voltage, and / or a medium-voltage regulating winding 7; the high-voltage regulating winding and the medium-voltage regulating winding can help regulate the output voltage to ensure that the output voltage is stable at a desired level, thereby improving the stability and reliability of the power system.

[0042] The arrangement of the high voltage regulating winding 6 and the medium voltage regulating winding 7 includes radial arrangement and axial arrangement. The high voltage regulating winding 6 and the medium voltage regulating winding 7 are wound on the iron core.

[0043] When the high voltage side has a voltage regulating tap, the windings of the transformer are arranged from the iron core outward in sequence as follows: iron core—first low voltage winding 1, second low voltage winding 2, third low voltage winding 3 wound simultaneously—high voltage winding 4—high voltage regulating winding 6, or, iron core—first low voltage winding 1, second low voltage winding 2, third low voltage winding 3 wound simultaneously—medium voltage winding 5—high voltage winding 4—high voltage regulating winding 6.

[0044] When the medium voltage side has a voltage regulating tap, the transformer windings are arranged from the iron core outward in sequence as follows: iron core—first low voltage winding 1, second low voltage winding 2, third low voltage winding 3 wound simultaneously—medium voltage winding 5—high voltage winding 4—medium voltage regulating winding 7.

[0045] When both the high-voltage and medium-voltage sides have voltage regulating taps, the windings of the transformer are arranged from the iron core outward in sequence as follows: iron core—the first low-voltage winding 1, the second low-voltage winding 2, the third low-voltage winding 3 wound simultaneously—the medium-voltage winding 5—the high-voltage winding 4—the high-voltage voltage regulating winding 6—the medium-voltage voltage regulating winding 7, or, iron core—three low-voltage windings wound simultaneously—the medium-voltage winding 5—the high-voltage winding 4—the axially arranged high-voltage voltage regulating winding 6 and the medium-voltage voltage regulating winding 7.

[0046] like Figure 3As shown, optionally, the first low voltage winding 1, the second low voltage winding 2, the third low voltage winding 3 and the high voltage winding 4 are all star-connected, or, when the first low voltage winding 1, the second low voltage winding 2, the third low voltage winding 3, the medium voltage winding 5 and the high voltage winding 4 are all star-connected, the low voltage three-split structure also includes a stabilizing winding 8 for reducing zero-sequence impedance, and the stabilizing winding 8 is wound on the iron core. The windings of the transformer are arranged from the iron core to the outside in sequence as follows: iron core-stabilizing winding 8-first low voltage winding 1, second low voltage winding 2, third low voltage winding 3 wound at the same time-high voltage winding 4, or, iron core-stabilizing winding 8-first low voltage winding 1, second low voltage winding 2, third low voltage winding 3 wound at the same time-medium voltage winding 5-high voltage winding 4. The design of the stabilizing winding helps to reduce the zero-sequence impedance and improve the performance and stability of the transformer. The reduction of the zero-sequence impedance can reduce the current during a ground fault and improve the safety of the system.

[0047] Optionally, the turns and oil passages of the first low-voltage winding 1, the second low-voltage winding 2, the third low-voltage winding 3, the medium-voltage winding 5 and the high-voltage winding 4 are arranged in an axially symmetrical manner. Axially symmetrical arrangement can help ensure that the magnetic field is evenly distributed throughout the transformer, thereby improving the efficiency and performance of the transformer.

[0048] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0049] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood by specific circumstances.

[0051] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A low-pressure three-splitting structure, characterized in that: include: A first low-voltage winding (1), a second low-voltage winding (2) and a third low-voltage winding (3); the voltage levels and rated capacities of the first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) are all the same; and the first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) all adopt a spiral structure.

2. The low-pressure three-split structure according to claim 1, characterized in that: The helical structure includes a single helix and a multiple helix.

3. The low-pressure three-split structure according to claim 1, characterized in that: When the first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) are wound radially with one wire, the first low-voltage winding (1) and the third low-voltage winding (3) are transposed at the middle incoming wire position.

4. The low-pressure three-split structure according to claim 1, characterized in that: When the first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) are wound in parallel using two self-adhesive transposed conductors, the conductors of the first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) are transposed at a 3 / 4 position of the first low-voltage winding (1), the first low-voltage winding (1) and the third low-voltage winding (3) are transposed at a 1 / 2 position of the first low-voltage winding (1), the conductor of the second low-voltage winding (2) is transposed at a 1 / 2 position of the first low-voltage winding (1), and the conductors of the first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) are transposed at a 1 / 4 position of the first low-voltage winding (1).

5. The low-pressure three-split structure according to claim 1, characterized in that: The first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) adopt a central line-in structure, and / or the arrangement of the turns and oil passages of the first low-voltage winding (1), the second low-voltage winding (2) and the third low-voltage winding (3) are all axially symmetrical.

6. A transformer, characterized in that: include: An iron core, a high-voltage winding (4) and a low-voltage three-split structure as described in any one of claims 1 to 5, wherein the first low-voltage winding (1), the second low-voltage winding (2), the third low-voltage winding (3) and the high-voltage winding (4) of the low-voltage three-split structure are all wound on the iron core.

7. The transformer according to claim 6, characterized in that: The high-voltage winding (4) adopts an end-line entry structure or a middle-line entry structure.

8. The transformer according to claim 6, characterized in that: Also includes: A medium voltage winding (5), wherein the medium voltage winding (5) adopts an end-in wire structure, and the medium voltage winding (5) is wound on the iron core.

9. The transformer according to claim 6, characterized in that: Also includes: A high voltage regulating winding (6) for regulating voltage, and / or a medium voltage regulating winding (7); The arrangement of the high voltage regulating winding (6) and the medium voltage regulating winding (7) includes radial arrangement and axial arrangement. The high voltage regulating winding (6) and the medium voltage regulating winding (7) are wound on the iron core.

10. The transformer according to claim 8, characterized in that: The first low-voltage winding (1), the second low-voltage winding (2), the third low-voltage winding (3) and the high-voltage winding (4) are all star-connected, or when the first low-voltage winding (1), the second low-voltage winding (2), the third low-voltage winding (3), the medium-voltage winding (5) and the high-voltage winding (4) are all star-connected, the low-voltage three-split structure further includes a stabilizing winding (8) for reducing zero-sequence impedance, and the stabilizing winding (8) is wound on the iron core.

11. The transformer according to claim 8, characterized in that: The arrangement of the turns and oil passages of the first low-voltage winding (1), the second low-voltage winding (2), the third low-voltage winding (3), the medium-voltage winding (5) and the high-voltage winding (4) are all axially symmetrical.

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