WO2023216757A9 - 屏蔽装置及电气设备 - Google Patents

屏蔽装置及电气设备 Download PDF

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Publication number
WO2023216757A9
WO2023216757A9 PCT/CN2023/085058 CN2023085058W WO2023216757A9 WO 2023216757 A9 WO2023216757 A9 WO 2023216757A9 CN 2023085058 W CN2023085058 W CN 2023085058W WO 2023216757 A9 WO2023216757 A9 WO 2023216757A9
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WO
WIPO (PCT)
Prior art keywords
shielding
coil
coil structure
central hole
wire
Prior art date
Application number
PCT/CN2023/085058
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English (en)
French (fr)
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WO2023216757A1 (zh
Inventor
张泽龙
胡小情
景遐明
黄朱勇
Original Assignee
华为数字能源技术有限公司
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Application filed by 华为数字能源技术有限公司 filed Critical 华为数字能源技术有限公司
Publication of WO2023216757A1 publication Critical patent/WO2023216757A1/zh
Publication of WO2023216757A9 publication Critical patent/WO2023216757A9/zh

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Classifications

    • 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
    • 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
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings

Definitions

  • the present application relates to the technical field of electrical equipment, and in particular, to a shielding device and electrical equipment.
  • electric field shielding technology is widely used in order to obtain higher insulation reliability. Moreover, a good electric field shielding solution can effectively reduce the amount of partial discharge of the device and extend the service life of the device.
  • existing electric field shielding solutions usually use conductive paint or metal coatings to shield medium and high-voltage coil structures. Specifically, an insulating layer is cast using insulating materials to isolate the medium and high-voltage coil structure from the low-voltage potential, and conductive paint or metal coating is arranged on the surface of the insulating layer through processes such as lamination, electroplating, evaporation, pouring or spraying.
  • a conductive layer is formed, and the conductive layer is connected to the low-voltage potential, thereby performing electric field shielding and obtaining a good insulation effect between the medium and high-voltage coil structure and the low-voltage potential.
  • the process technology required for this shielding method is relatively complex, the cost is high, and it is not convenient for batch processing.
  • This application provides a shielding device and electrical equipment to facilitate electric field shielding of the coil structure.
  • the present application provides a shielding device for a coil structure, the coil structure having a first central hole.
  • the shielding device may include a first shielding part and an insulating part.
  • the first shielding part may include a first wire, the first wire may pass through the first central hole and be wound around the coil structure to form the first shielding coil, the first end of the first wire may be used to connect to the high voltage potential, and the first wire may The second end can be an open circuit.
  • the insulating part may wrap the coil structure and the first shielding part, the insulating part may have a second central hole, and the second central hole may be located in the first central hole.
  • a first wire is wound around a coil structure to form a first shielding coil.
  • the first wire is connected to a high-voltage potential.
  • the first shielding part can serve as a high-voltage electric field shielding function.
  • the shielding device has insulating properties and can ensure that the shielded part is electrified.
  • the body has good power frequency voltage withstand capability and excellent lightning impact protection capability. It can also effectively suppress the partial discharge phenomenon of the shielded charged body and extend the service life of the charged body.
  • the first shielding coil formed by winding the first wire is not easily affected by the expansion stress of the insulation part.
  • the resistivity of the first shielding part is relatively stable, and the shielding device can maintain a relatively reliable electric field shielding effect.
  • the structure of the shielding device is relatively simple, the process technology required for molding is also relatively simple, the cost is low, and it is easy to apply in batch processing.
  • the first shielding coil may include a plurality of first shielding coil units, and the plurality of first shielding coil units may be arranged at equal intervals along the circumferential direction of the coil structure.
  • the resistivity difference of the first shielded coil at different positions in the circumferential direction of the coil structure can be small, that is, the resistivity difference of the first shielding part at different positions in the circumferential direction of the coil structure can be small, that is, the resistivity of the first shielding part is consistent.
  • the property can be higher, and the first shielding part can have a relatively uniform The electric field is distributed, so that the electric field shielding effect of the first shielding part is ideal.
  • the first end of the first wire may be electrically connected to one end of the coil structure.
  • the first shielding part can be at a high voltage potential, and the first shielding part can play a high-voltage electric field shielding role.
  • the shielding device may further include a second shielding part, the second shielding part may include a second wire, and the second wire may pass through the second central hole and be wound around the coil structure to form a second shielding coil,
  • the first end of the second conductor may be used for connection to the low voltage potential, and the second end of the second conductor may be open circuit.
  • the second shielding part can be at a low-voltage potential, and the second shielding part can play a low-voltage electric field shielding role.
  • the second shielding coil may include a plurality of second shielding coil units, and the plurality of second shielding coil units may be arranged at equal intervals along the circumferential direction of the coil structure.
  • the resistivity difference of the second shielded coil at different positions in the circumferential direction of the coil structure can be smaller, that is, the resistivity difference of the second shielding portion at different positions in the circumferential direction of the coil structure can be smaller, that is, the resistivity of the second shielding portion is consistent.
  • the resistance can be higher, the second shielding part can also have a relatively uniform electric field distribution, the electric field shielding effect of the second shielding part is also ideal, and the insulation performance of the shielding device is more reliable.
  • the shielding device may further include a third shielding part.
  • the third shielding part may include a shielding film.
  • the shielding film may wrap the coil structure, the first shielding part and the insulating part.
  • the shielding film may be For connection to low voltage potential. In this way, the third shielding part can be at a low-voltage potential, and the third shielding part can play a low-voltage electric field shielding role.
  • the present application provides a shielding device for a coil structure, the coil structure having a first central hole.
  • the shielding device may include a first shielding part, an insulation part and a second shielding part.
  • the first shielding part may include a shielding film, the shielding film may wrap the coil structure, and the shielding film may be used to connect to the high voltage potential.
  • the first shield part may have a third central hole, and the third central hole may be located within the first central hole.
  • the insulating part may wrap the coil structure and the first shielding part, the insulating part may have a second central hole, and the second central hole may be located in the third central hole.
  • the second shielding part may include a conductor, the conductor may pass through the second central hole and be wound around the coil structure to form a shielded coil, the first end of the conductor may be used to connect to a low-voltage potential, and the second end of the conductor may be an open circuit.
  • the shielding film of the first shielding part is wrapped around the coil structure and connected to the high-voltage potential, so that the first shielding part can play a high-voltage electric field shielding role.
  • the wires of the second shielding part are wound around the coil structure to form a shielding coil, and the wires are connected to the low-voltage potential, so that the second shielding part can function as a low-voltage electric field shielding.
  • the first shielding part and the second shielding part work together to make the electric field shielding effect of the shielding device more ideal and the insulation performance more reliable, which can ensure that the shielded charged body has good power frequency withstand voltage capabilities and lightning impact protection capabilities, and can Effectively suppress the partial discharge phenomenon of the shielded charged body and extend the service life of the charged body.
  • the shielding device has a relatively simple structure, the process technology required for molding is also relatively simple, the cost is low, and it is convenient for batch processing.
  • the shielding coil may include multiple shielding coil units, and the multiple shielding coil units may be arranged at equal intervals along the circumferential direction of the coil structure.
  • the resistivity difference of the shielded coil at different positions in the circumferential direction of the coil structure can be smaller, that is, the resistivity difference of the second shielding part at different positions in the circumferential direction of the coil structure can be smaller, that is, the resistivity consistency of the second shielding part can be Higher, the second shielding part has a relatively uniform electric field distribution, and the electric field shielding effect of the second shielding part is relatively ideal.
  • the shielding film may be electrically connected to one end of the coil structure.
  • the first shielding part can be at a high voltage potential, and the first shielding part can play a high-voltage electric field shielding role.
  • the present application provides an electrical device, including a coil structure, and a shielding device as in any of the possible implementations of the first aspect or the second aspect.
  • the electric field shielding effect of the shielding device is relatively ideal, and the insulation performance is relatively reliable. It can ensure that the shielded charged body has good power frequency withstand voltage capabilities and lightning impact protection capabilities, and can also effectively suppress the shielded charged body. It shields the partial discharge phenomenon of the charged body and extends the service life of the charged body. As a result, the electrical equipment has higher working stability and longer service life.
  • Figure 1 is a schematic diagram of the coil structure
  • Figure 2 is a schematic structural diagram of the first shielding part of the shielding device provided by the embodiment of the present application.
  • Figure 3 is a schematic structural diagram of a shielding device provided by an embodiment of the present application.
  • Figure 4 is a schematic diagram of the main magnetic circuit of the coil structure
  • Figure 5 is a schematic structural diagram of a shielding device provided by another embodiment of the present application.
  • Figure 6 is a schematic structural diagram of a shielding device provided by another embodiment of the present application.
  • Figure 7 is a cross-sectional view of the shielding device in Figure 6 along the A-A direction;
  • Figure 8 is a schematic structural diagram of the first shielding part of the shielding device provided by another embodiment of the present application.
  • Figure 9 is a schematic structural diagram of the insulating part of the shielding device provided by another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of the second shielding part of the shielding device provided by another embodiment of the present application.
  • the shielding device provided by the embodiment of the present application can be adapted to electrical equipment, such as medium and high voltage electrical equipment.
  • electrical equipment such as medium and high voltage electrical equipment.
  • it can be applied in the field of transformers as an electric field shielding device for the coil structure of the transformer to achieve an insulation effect.
  • the shielding device provided by the embodiment of the present application is not limited to application in medium and high voltage coil structures and medium and high voltage magnetic parts, and can also be applied in electrical equipment such as medium and high voltage frequency converters and DC microgrids.
  • a transformer is an electrical appliance that uses the principle of electromagnetic induction to transfer electrical energy or signals from one circuit to another.
  • Transformers usually include an iron core (or magnetic core) and a coil.
  • the coil is wound around the iron core (or magnetic core).
  • the coil usually has two or more windings, of which the winding connected to the power supply is called the primary coil (or primary winding).
  • the remaining windings are called secondary coils (or secondary windings).
  • Electrical energy is transmitted between the primary coil and the secondary coil, converting the AC voltage and current of one circuit into the voltage and current of another circuit.
  • Both the primary and secondary coils have central holes in which the iron core (or magnetic core) is located.
  • the shielding device involved in this application can be applied to both the primary coil and the secondary coil.
  • conductive paint or metal coatings Existing coil structures and other medium and high voltage charged objects are usually shielded using conductive paint or metal coatings. Specifically, an insulating layer is first formed on the surface of the coil structure, and then conductive paint or metal coating is arranged on the surface of the insulating layer to form a conductive layer through processes such as lamination, electroplating, evaporation, pouring or spraying. When used specifically, the conductive layer is connected to the low-voltage potential, thereby shielding the electric field and achieving a good insulation effect between the coil structure and the low-voltage potential.
  • the process technology required for this shielding method is relatively complex, the cost is high, and it is not convenient for batch processing.
  • embodiments of the present application provide a shielding device to facilitate electric field shielding of the coil structure.
  • Figure 1 shows a schematic structural diagram of the coil structure.
  • Figure 2 shows a schematic diagram of the present application.
  • FIG. 3 shows a schematic structural diagram of the shielding device provided by the embodiment of the present application.
  • the shielding device provided by the embodiment of the present application can be used in the coil structure 100.
  • the coil structure 100 has a first central hole 101.
  • the shielding device may include a first shielding part 200 and an insulating part 300 .
  • the first shielding part 200 may include a first wire.
  • the first conductor may be a multi-stranded Litz wire, a film-coated wire, a silk-coated wire, a flat wire, a three-layer insulated wire or a copper tape.
  • the first wire may pass through the first central hole 101 and wrap around the coil structure 100, thereby forming a first shielded coil.
  • the first end of the first wire may be connected to a high voltage potential, and the second end of the first wire may be open circuit, so that the first shielding part 200 may be at a high voltage potential, and the first shielding part 200 may function as a high voltage electric field shield.
  • the insulation part 300 can wrap the coil structure 100 and the first shielding part 200 therein.
  • the insulation part 300 may be made of epoxy resin, rubber or other insulation materials.
  • the insulation part 300 may have a second central hole 301 , and the second central hole 301 may be located within the first central hole 101 .
  • the second central hole 301 may be coaxially disposed with the first central hole 101 .
  • the iron core (or magnetic core) of the transformer may be located in the second central hole 301 .
  • the first wire winding coil structure 100 forms a first shielding coil.
  • the first wire is connected to a high-voltage potential.
  • the first shielding part 200 can play a high-voltage electric field shielding role.
  • the shielding device has insulating properties and can It ensures that the shielded charged body has good power frequency withstand voltage and lightning impact protection capabilities. It can also effectively suppress the partial discharge phenomenon of the shielded charged body and extend the service life of the charged body.
  • the shielding device when the shielding device is subjected to temperature shock, such as when the heat of the shielded charged body changes, the first shielding coil formed by winding the first wire is not easily affected by the expansion stress of the insulating part 300, and the resistivity of the first shielding part 200 It is relatively stable and the electric field shielding effect of the shielding device is relatively reliable.
  • the structure of the shielding device is relatively simple, the process technology required for molding is also relatively simple, the cost is low, it is convenient for batch processing, and can improve the consistency of batch processing of products.
  • the first shielding coil may include a plurality of first shielding coil units, that is, the first wire may be wound around the coil structure more than 100 times.
  • Each turn of the first conductor is a first shielding coil unit, and multiple first shielding coil units constitute a first shielding coil.
  • the distance between adjacent first shielded coil units along the circumferential direction of the coil structure 100 is called the inter-turn distance of the first shielded coil.
  • a plurality of first shielding coil units may be arranged at equal intervals along the circumferential direction of the coil structure 100 , that is, the first shielding coils may be coils with equal distance between turns. Therefore, the difference in resistivity of the first shielding coil at different positions in the circumferential direction of the coil structure 100 is small, that is, the difference in resistivity of the first shielding part 200 at different positions in the circumferential direction of the coil structure 100 is small. That is to say, the first shielding The resistivity consistency of the first shielding part 200 is relatively high, the first shielding part 200 has a relatively uniform electric field distribution, the electric field shielding effect of the first shielding part 200 is relatively ideal, and the shielding device has high insulation reliability.
  • the shielding device when the shielding device uses first shielding coils of different specifications, the shielding device has different electric field shielding effects.
  • the shielding device can have different electric field shielding effects by selecting first shielding coils with different distances between turns. For example, by selecting the first shielding coil with a smaller distance between turns, the shielding device will have a stronger electric field. Shielding effect.
  • the shielding device can also have different electric field shielding effects by selecting first wires of different thicknesses. For example, if a thicker first wire is selected, the shielding device will have a stronger electric field shielding effect.
  • the shielding device when the shielding device uses first shielding coils of different specifications, the shielding device has different effects on the AC resistance of the coil structure 100, and thus has different effects on the overall heat loss of the transformer. For example, if a first shielded coil with a larger distance between turns is selected, the coil structure 100 will have a smaller AC resistance, and the overall heat loss of the transformer will be smaller; if a thinner first wire is selected, the coil structure 100 will have a smaller The smaller the AC resistance, the smaller the overall heat loss of the transformer.
  • the first shielding coil with different inter-turn distances at different positions can also be used, and the first shielding coil with the first conductors having different thicknesses at different positions can also be used.
  • the distance between turns of the first shielded coil needs to be greater than zero, that is, there is no contact between adjacent turns of the first shielded coil, thereby ensuring that the first shielded coil does not constitute a major factor in the coil structure.
  • a closed loop of the magnetic circuit thus not affecting the electrical parameters of the transformer.
  • the first end of the first wire may be electrically connected to one end of the coil structure 100 .
  • the starting line of the coil structure 100 is electrically connected to the high voltage potential of the system, and the first end of the first conductor may be electrically connected to the starting line of the coil structure 100 .
  • the first end of the first conductor can be connected to other high voltage potentials of the transformer system. Therefore, the first shielding part 200 can be at a high voltage potential, and the first shielding part 200 can function as a high-voltage electric field shielding function.
  • FIG. 5 shows a schematic structural diagram of a shielding device provided by another embodiment of the present application.
  • the shielding device may further include a second shielding part 400 .
  • the second shield part 400 may include a second conductive wire.
  • the second wire may pass through the second central hole 301 and wrap around the insulation part 300, thereby wrapping the coil structure.
  • the second wire is wound around the coil structure to form a second shielding coil.
  • the first end of the second conductor may be connected to the low voltage potential, and the second end of the second conductor may be open circuit. Therefore, the second shielding part 400 can be at a low voltage potential, and the second shielding part 400 can function as a low-voltage electric field shielding.
  • the second shielding coil may include a plurality of second shielding coil units, that is, the second wire may be wound around the coil structure multiple times, and each turn of the second wire is a second shielding coil unit, and multiple second wires may be wound around the coil structure multiple times.
  • the two shielding coil units constitute a second shielding coil.
  • the plurality of second shielding coil units may be arranged at equal intervals along the circumferential direction of the coil structure, that is, the second shielding coil may be a coil with equal distance between turns.
  • the resistivity difference of the second shielded coil at different positions in the circumferential direction of the coil structure is small, that is, the resistivity difference of the second shielding part 400 at different positions in the circumferential direction of the coil structure is small. That is to say, the second shielding part 400
  • the resistivity consistency is also high, the second shielding part 400 also has a relatively uniform electric field distribution, the electric field shielding effect of the second shielding part 400 is also relatively ideal, and the insulation performance of the shielding device is more reliable.
  • the distance between turns of the second shielding coil also needs to be greater than zero, that is, there is no contact between adjacent turns of the second shielding coil, thereby ensuring that the second shielding coil does not form a closed loop regarding the main magnetic circuit of the coil structure. , so as not to affect the electrical parameters of the transformer.
  • Figure 6 shows a schematic structural diagram of a shielding device provided by another embodiment of the present application
  • Figure 7 shows a cross-sectional view of the shielding device in Figure 6 along the A-A direction.
  • the shielding device may further include a third shielding part 500 .
  • the third shielding part 500 may include a shielding film.
  • the shielding device may not include the second shielding part.
  • the shielding film can wrap the coil structure 100, the first shielding part 200 and the insulating part 300.
  • the shielding film can be made of semi-conductive crepe paper.
  • the shielding film may be evenly wrapped around the outer wall of the insulating part 300 .
  • the shielding film can be connected to a low-voltage potential, so that the shielding film can be at a low-voltage potential, and the third shielding part 500 can play a low-voltage electric field shielding role.
  • the shielding device provided by the embodiments of the present application may also have other specific implementations.
  • Figure 8 shows a schematic structural view of the first shielding part of the shielding device provided by another embodiment of the present application.
  • Figure 9 shows a schematic structural view of the insulating part of the shielding device provided by another embodiment of the present application.
  • Figure 10 shows is a schematic structural diagram of the second shielding part of the shielding device provided by another embodiment of the present application.
  • the shielding device can be used in a coil structure, and the coil structure has a first central hole.
  • the shielding device may include a first shielding part 200, an insulation part 300 and a second shielding part 400.
  • the first shielding part 200 may include a shielding film.
  • the shielding film may be semi-conductive crepe paper.
  • the shielding film can wrap the coil structure. Specifically, the shielding film can pass through the first central hole and wrap around the coil structure. Since the shielding film passes through the first central hole and is wound around the coil structure, the first shielding part 200 composed of the shielding film has a third central hole 201 located in the first central hole, specifically, the third central hole 201 is located in the first central hole. Hole 201 may be disposed coaxially with the first central hole.
  • the shielding film can be connected to a high-voltage potential, so that the first shielding portion 200 can be at a high-voltage potential, and the first shielding portion 200 can function as a high-voltage electric field shield.
  • the insulation part 300 can wrap the coil structure and the first shielding part 200 inside.
  • the insulation part 300 may have a second central hole 301 , and the second central hole 301 may be located within the third central hole 201 .
  • the iron core (or magnetic core) of the transformer may be located in the second central hole 301 .
  • the second shielding part 400 may include wires, and the wires may pass through the second central hole 301 and be wound around the coil structure, thereby forming a shielding coil.
  • the first end of the conductor can be connected to a low-voltage potential, the second end of the conductor can be disconnected, and the second shielding portion 400 can function as a low-voltage electric field shield.
  • the shielding film of the first shielding part 200 is wrapped around the coil structure and connected to the high-voltage potential, so that the first shielding part 200 can function as a high-voltage electric field shielding.
  • the wire-wound coil structure of the second shielding part 400 forms a shielding coil, and the wires are connected to low-voltage potential, so that the second shielding part 400 can function as a low-voltage electric field shield.
  • the first shielding part 200 and the second shielding part 400 work together.
  • the insulation performance of the shielding device is relatively reliable, which can ensure that the shielded charged body has good power frequency withstand voltage capabilities and lightning impact protection capabilities, and can effectively suppress the shielded
  • the partial discharge phenomenon of charged objects extends the service life of charged objects.
  • the shielding device has a relatively simple structure, the process technology required for molding is also relatively simple, the cost is low, and it is convenient for batch processing.
  • the shielding film can be electrically connected to one end of the coil structure.
  • the origin of the coil structure is electrically connected to the high voltage potential of the system, and the shielding film can be electrically connected to the origin of the coil structure.
  • the shielding membrane can be connected to other high-voltage potentials of the transformer. Therefore, the first shielding part 200 can be at a high voltage potential, and the first shielding part 200 can function as a high-voltage electric field shielding function.
  • the shielding coil may include multiple shielding coil units, that is, the conductor may be wound around the coil structure multiple times, and each turn of the conductor is a shielding coil unit, and multiple shielding coil units constitute a shielding coil.
  • multiple shielding coil units can be arranged at equal intervals along the circumferential direction of the coil structure, that is, the shielding coils can be coils with equal distance between turns, so that the resistivity difference of the shielding coil at different positions in the circumferential direction of the coil structure is small, that is, the first The difference in resistivity between the two shielding parts 400 at different positions in the circumferential direction of the coil structure is small. That is to say, the resistivity of the second shielding part 400 is relatively consistent.
  • the second shielding part 400 has a relatively uniform electric field distribution.
  • the second shielding part 400 has a relatively uniform electric field distribution.
  • the electric field shielding effect of part 400 is relatively ideal, and the insulation performance of the shielding device is relatively reliable.

Abstract

提供了一种屏蔽装置及电气设备。屏蔽装置用于线圈结构，线圈结构具有第一中心孔。屏蔽装置包括第一屏蔽部和绝缘部。第一屏蔽部包括第一导线，第一导线穿过第一中心孔并缠绕线圈结构以构成第一屏蔽线圈，第一导线的第一端用于与高压电位连接，第一导线的第二端断路。绝缘部将线圈结构及第一屏蔽部包裹在内，绝缘部具有第二中心孔，第二中心孔位于第一中心孔内。在采用上述结构时，第一屏蔽部可以起到高压电场屏蔽作用，屏蔽装置具有绝缘性能，且屏蔽装置结构比较简单，成型所需的工艺技术也比较简单，成本较低，方便在批量加工中应用。

Description

屏蔽装置及电气设备
相关申请的交叉引用
本申请要求在2022年05月10日提交中国专利局、申请号为202210505602.7、申请名称为“屏蔽装置及电气设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电气设备技术领域，尤其涉及一种屏蔽装置及电气设备。
背景技术
在中高压电气设备领域，电场屏蔽技术被广泛应用，以期得到较高的绝缘可靠性。并且，良好的电场屏蔽方案可以有效降低器件局部放电的放电量，延长器件的使用寿命。以变压器领域为例，现有的电场屏蔽方案通常是使用导电漆或金属涂层对中高压线圈结构进行屏蔽。具体地，使用绝缘材料浇筑成型绝缘层，以使中高压线圈结构和低压电位隔离，并通过贴覆、电镀、蒸镀、浇注或喷涂等工艺，在绝缘层表面布置导电漆或金属涂层以形成导电层，且将导电层与低压电位连接，由此进行电场屏蔽，在中高压线圈结构与低压电位之间获得良好的绝缘效果。但是，这种屏蔽方式所需的工艺技术比较复杂，成本较高，不便于批量加工。
发明内容
本申请提供了一种屏蔽装置及电气设备，以便于对线圈结构进行电场屏蔽。
第一方面，本申请提供了一种屏蔽装置，用于线圈结构，线圈结构具有第一中心孔。屏蔽装置可以包括第一屏蔽部和绝缘部。第一屏蔽部可以包括第一导线，第一导线可以穿过第一中心孔并缠绕线圈结构以构成第一屏蔽线圈，第一导线的第一端可以用于与高压电位连接，第一导线的第二端可以为断路。绝缘部可以将线圈结构及第一屏蔽部包裹在内，绝缘部可以具有第二中心孔，第二中心孔可以位于第一中心孔内。
本申请提供的技术方案，第一导线缠绕线圈结构构成第一屏蔽线圈，第一导线与高压电位连接，第一屏蔽部可以起到高压电场屏蔽作用，屏蔽装置具有绝缘性能，可以保证被屏蔽带电体具备良好的工频耐压能力，优秀的防雷电冲击能力，还可以有效地抑制被屏蔽带电体的局部放电现象，延长带电体使用寿命。并且，当屏蔽装置受到温度冲击时，第一导线缠绕构成的第一屏蔽线圈不易受到绝缘部膨胀应力的影响，第一屏蔽部的电阻率比较稳定，屏蔽装置可以保持比较可靠的电场屏蔽效果。屏蔽装置结构比较简单，成型所需的工艺技术也比较简单，成本较低，方便在批量加工中应用。
在一个具体的可实施方案中，第一屏蔽线圈可以包括多个第一屏蔽线圈单元，多个第一屏蔽线圈单元可以沿线圈结构的周向等间隔排布。这样第一屏蔽线圈在线圈结构周向上不同位置的电阻率差异可以较小，即第一屏蔽部在线圈结构周向上不同位置的电阻率差异可以较小，也就是第一屏蔽部的电阻率一致性可以较高，第一屏蔽部可以具有比较均匀的 电场分布，从而第一屏蔽部的电场屏蔽效果比较理想。
在具体设置第一导线时，第一导线的第一端可以与线圈结构的一端电连接。这样第一屏蔽部可以处于高压电位，第一屏蔽部可以起到高压电场屏蔽作用。
在一个具体的可实施方案中，屏蔽装置还可以包括第二屏蔽部，第二屏蔽部可以包括第二导线，第二导线可以穿过第二中心孔并缠绕线圈结构以构成第二屏蔽线圈，第二导线的第一端可以用于与低压电位连接，第二导线的第二端可以为断路。这样第二屏蔽部可以处于低压电位，第二屏蔽部可以起到低压电场屏蔽作用。
在一个具体的可实施方案中，第二屏蔽线圈可以包括多个第二屏蔽线圈单元，多个第二屏蔽线圈单元可以沿线圈结构的周向等间隔排布。这样第二屏蔽线圈在线圈结构周向上不同位置的电阻率差异可以较小，即第二屏蔽部在线圈结构周向上不同位置的电阻率差异可以较小，也就是第二屏蔽部的电阻率一致性可以较高，第二屏蔽部也可以具有比较均匀的电场分布，第二屏蔽部的电场屏蔽效果也比较理想，屏蔽装置的绝缘性能更加可靠。
在一个具体的可实施方案中，屏蔽装置还可以包括第三屏蔽部，第三屏蔽部可以包括屏蔽膜，屏蔽膜可以将线圈结构、第一屏蔽部及绝缘部包裹在内，屏蔽膜可以用于与低压电位连接。这样第三屏蔽部可以处于低压电位，第三屏蔽部可以起到低压电场屏蔽作用。
第二方面，本申请提供了一种屏蔽装置，用于线圈结构，线圈结构具有第一中心孔。屏蔽装置可以包括第一屏蔽部、绝缘部及第二屏蔽部。第一屏蔽部可以包括屏蔽膜，屏蔽膜可以将线圈结构包裹在内，屏蔽膜可以用于与高压电位连接。第一屏蔽部可以具有第三中心孔，第三中心孔可以位于第一中心孔内。绝缘部可以将线圈结构及第一屏蔽部包裹在内，绝缘部可以具有第二中心孔，第二中心孔可以位于第三中心孔内。第二屏蔽部可以包括导线，导线可以穿过第二中心孔并缠绕线圈结构以构成屏蔽线圈，导线的第一端可以用于与低压电位连接，导线的第二端可以为断路。
本申请提供的技术方案，第一屏蔽部的屏蔽膜缠绕线圈结构并与高压电位连接，使得第一屏蔽部可以起到高压电场屏蔽作用。第二屏蔽部的导线缠绕线圈结构构成屏蔽线圈，导线与低压电位连接，使得第二屏蔽部可以起到低压电场屏蔽作用。第一屏蔽部与第二屏蔽部共同作用，使得屏蔽装置的电场屏蔽效果比较理想，绝缘性能比较可靠，可以保证被屏蔽带电体具备良好的工频耐压能力、防雷电冲击能力，并且可以有效地抑制被屏蔽带电体的局部放电现象，延长带电体使用寿命。屏蔽装置结构比较简单，成型所需的工艺技术也比较简单，成本较低，方便应用于批量加工。
在一个具体的可实施方案中，屏蔽线圈可以包括多个屏蔽线圈单元，多个屏蔽线圈单元可以沿线圈结构的周向等间隔排布。这样屏蔽线圈在线圈结构周向上不同位置的电阻率差异可以较小，即第二屏蔽部在线圈结构周向上不同位置的电阻率差异可以较小，也就是第二屏蔽部的电阻率一致性可以较高，第二屏蔽部具有比较均匀的电场分布，第二屏蔽部的电场屏蔽效果比较理想。
在一个具体的可实施方案中，屏蔽膜可以与线圈结构的一端电连接。这样第一屏蔽部可以处于高压电位，第一屏蔽部可以起到高压电场屏蔽作用。
第三方面，本申请提供了一种电气设备，包括线圈结构，以及如前述第一方面或第二方面的任一可实施方案中的屏蔽装置。
本申请提供的技术方案，屏蔽装置的电场屏蔽效果比较理想，绝缘性能比较可靠，可以保证被屏蔽带电体具备良好的工频耐压能力、防雷电冲击能力，还可以有效地抑制被屏 蔽带电体的局部放电现象，延长带电体使用寿命，由此，电气设备的工作稳定性较高，使用寿命较长。
附图说明
图1为线圈结构的结构示意图；
图2为本申请实施例提供的屏蔽装置的第一屏蔽部的结构示意图；
图3为本申请实施例提供的屏蔽装置的结构示意图；
图4为线圈结构主磁路的示意图；
图5为本申请另一实施例提供的屏蔽装置的结构示意图；
图6为本申请另一实施例提供的屏蔽装置的结构示意图；
图7为图6中的屏蔽装置沿A-A方向的剖视图；
图8为本申请另一实施例提供的屏蔽装置的第一屏蔽部的结构示意图；
图9为本申请另一实施例提供的屏蔽装置的绝缘部的结构示意图；
图10为本申请另一实施例提供的屏蔽装置的第二屏蔽部的结构示意图。
附图标记：
100-线圈结构；200-第一屏蔽部；300-绝缘部；400-第二屏蔽部；500-第三屏蔽部；
101-第一中心孔；201-第三中心孔；301-第二中心孔。
具体实施方式
下面将结合附图，对本申请实施例进行详细描述。
为了方便理解，首先说明本申请涉及的屏蔽装置的应用场景。本申请实施例提供的屏蔽装置可以适配于电气设备，如中高压电气设备，示例性地，可以应用于变压器领域，作为变压器的线圈结构的电场屏蔽装置，用于实现绝缘效果。当然，本申请实施例提供的屏蔽装置不限于应用于中高压线圈结构、中高压磁件，也可以应用于中高压变频器、直流微电网等电气设备中。
变压器是利用电磁感应原理，从一个电路向另一个电路传递电能或传输信号的一种电器。变压器通常包括铁芯(或磁芯)和线圈，线圈缠绕铁芯(或磁芯)，线圈通常有两个或两个以上的绕组，其中与电源连接的绕组叫初级线圈(或一次绕组)，其余的绕组叫次级线圈(或二次绕组)。电能在初级线圈与次级线圈之间传输，实现将一个电路的交流电压和电流转换为另一个电路的电压和电流。初级线圈和次级线圈都具有中心孔，铁芯(或磁芯)位于中心孔内。本申请涉及的屏蔽装置可以应用于初级线圈，也可以应用于次级线圈。
现有的线圈结构及其他中高压带电体通常是使用导电漆或金属涂层进行屏蔽。具体地，先在线圈结构表面成型绝缘层，再通过贴覆、电镀、蒸镀、浇注或喷涂等工艺，在绝缘层表面布置导电漆或金属涂层以形成导电层。具体使用时，将导电层与低压电位连接，由此进行电场屏蔽，实现在线圈结构与低压电位之间获得良好的绝缘效果。这种屏蔽方式所需的工艺技术比较复杂，成本较高，不便于批量加工。
基于此，本申请实施例提供了一种屏蔽装置，以便于对线圈结构进行电场屏蔽。
首先参考图1、图2及图3，图1示出了线圈结构的结构示意图，图2示出了本申请 实施例提供的屏蔽装置的第一屏蔽部的结构示意图，图3示出了本申请实施例提供的屏蔽装置的结构示意图。如图1、图2及图3所示，本申请实施例提供的屏蔽装置可以用于线圈结构100，线圈结构100具有第一中心孔101。屏蔽装置可以包括第一屏蔽部200和绝缘部300。
其中，第一屏蔽部200可以包括第一导线。具体地，第一导线可以采用多股利兹线、膜包线、丝包线、扁平线、三层绝缘线或铜带等。第一导线可以穿过第一中心孔101并缠绕线圈结构100，从而构成第一屏蔽线圈。第一导线的第一端可以与高压电位连接，第一导线的第二端可以为断路，从而第一屏蔽部200可以处于高压电位，第一屏蔽部200可以起到高压电场屏蔽作用。
绝缘部300可以将线圈结构100及第一屏蔽部200包裹在内。具体地，绝缘部300可以由环氧树脂、橡胶或其他绝缘材料制成。绝缘部300可以具有第二中心孔301，第二中心孔301可以位于第一中心孔101内。具体地，第二中心孔301可以与第一中心孔101同轴设置。实际应用时，变压器的铁芯(或磁芯)可以位于第二中心孔301内。
本申请实施例提供的屏蔽装置，第一导线缠绕线圈结构100构成第一屏蔽线圈，第一导线与高压电位连接，第一屏蔽部200可以起到高压电场屏蔽作用，屏蔽装置具有绝缘性能，可以保证被屏蔽带电体具备良好的工频耐压能力、防雷电冲击能力，还可以有效地抑制被屏蔽带电体的局部放电现象，延长带电体使用寿命。并且，当屏蔽装置受到温度冲击时，如被屏蔽带电体的热量发生变化时，由第一导线缠绕构成的第一屏蔽线圈不易受到绝缘部300膨胀应力的影响，第一屏蔽部200的电阻率比较稳定，屏蔽装置的电场屏蔽作用比较可靠。屏蔽装置结构比较简单，成型所需的工艺技术也比较简单，成本较低，方便应用于批量加工，可以提高产品批量加工的一致性。
在具体实施中，第一屏蔽线圈可以包括多个第一屏蔽线圈单元，即第一导线可以缠绕线圈结构100多圈。每圈第一导线即为一个第一屏蔽线圈单元，多个第一屏蔽线圈单元构成第一屏蔽线圈。为了便于描述，称相邻的第一屏蔽线圈单元沿线圈结构100周向的间距为第一屏蔽线圈的匝间距离。
具体实施时，多个第一屏蔽线圈单元可以沿线圈结构100的周向等间隔排布，即第一屏蔽线圈可以为等匝间距离线圈。由此，第一屏蔽线圈在线圈结构100周向上不同位置的电阻率差异较小，即第一屏蔽部200在线圈结构100周向上不同位置的电阻率差异较小，也就是说，第一屏蔽部200的电阻率一致性较高，第一屏蔽部200具有比较均匀的电场分布，第一屏蔽部200的电场屏蔽效果比较理想，屏蔽装置具有较高的绝缘可靠性。
在实际应用中，当屏蔽装置选用不同规格的第一屏蔽线圈时，屏蔽装置具有不同的电场屏蔽效果。具体地，可以通过选用不同匝间距离的第一屏蔽线圈，使屏蔽装置具有不同的电场屏蔽效果，示例性地，选用匝间距离较小的第一屏蔽线圈，屏蔽装置则具有较强的电场屏蔽效果。还可以通过选用不同粗细的第一导线，使屏蔽装置具有不同的电场屏蔽效果，示例性地，选用较粗的第一导线，屏蔽装置则具有较强的电场屏蔽效果。此外，当屏蔽装置选用不同规格的第一屏蔽线圈时，屏蔽装置对线圈结构100的交流电阻大小具有不同的影响，进而对变压器整体的热损耗具有不同的影响。示例性地，选用匝间距离较大的第一屏蔽线圈，线圈结构100则具有较小的交流电阻，变压器整体的热损耗则较小；选用较细的第一导线，线圈结构100则具有较小的交流电阻，变压器整体的热损耗则较小。
可以理解，当线圈结构100的不同位置需要强弱不同的屏蔽效果时，可以采用在不同 位置具有不同匝间距离的第一屏蔽线圈，也可以采用在不同位置第一导线具有不同粗细的第一屏蔽线圈。
如图4所示，需要说明的是，第一屏蔽线圈的匝间距离需大于零，也就是第一屏蔽线圈的相邻匝间不接触，由此保证第一屏蔽线圈不构成关于线圈结构主磁路的闭环回路，从而不会影响变压器的电气参数。
具体实施时，如图2所示，第一导线的第一端可以与线圈结构100的一端电连接。示例性地，线圈结构100的起线与系统高压电位电连接，第一导线的第一端可以与线圈结构100的起线电连接。或者，第一导线的第一端可以与变压器系统的其他高压电位连接。由此，第一屏蔽部200可以处于高压电位，第一屏蔽部200可以起到高压电场屏蔽作用。
图5示出了本申请另一实施例提供的屏蔽装置的结构示意图。如图5所示，作为一种可能的实施例，屏蔽装置还可以包括第二屏蔽部400。第二屏蔽部400可以包括第二导线。第二导线可以穿过第二中心孔301并缠绕绝缘部300，从而缠绕线圈结构。第二导线缠绕线圈结构设置，构成第二屏蔽线圈。
具体实施时，第二导线的第一端可以与低压电位连接，第二导线的第二端可以为断路。由此，第二屏蔽部400可以处于低压电位，第二屏蔽部400可以起到低压电场屏蔽作用。
在具体实施中，相似地，第二屏蔽线圈可以包括多个第二屏蔽线圈单元，即第二导线可以缠绕线圈结构多圈，每圈第二导线即为一个第二屏蔽线圈单元，多个第二屏蔽线圈单元构成第二屏蔽线圈。多个第二屏蔽线圈单元可以沿线圈结构的周向等间隔排布，即第二屏蔽线圈可以为等匝间距离线圈。由此，第二屏蔽线圈在线圈结构周向上不同位置的电阻率差异较小，即第二屏蔽部400在线圈结构周向上不同位置的电阻率差异较小，也就是说，第二屏蔽部400的电阻率一致性也较高，第二屏蔽部400也具有比较均匀的电场分布，第二屏蔽部400的电场屏蔽效果也比较理想，屏蔽装置的绝缘性能更加可靠。
需要说明的是，第二屏蔽线圈的匝间距离也需大于零，也就是第二屏蔽线圈的相邻匝间不接触，由此保证第二屏蔽线圈不构成关于线圈结构主磁路的闭环回路，以免影响变压器的电气参数。
图6示出了本申请另一实施例提供的屏蔽装置的结构示意图，图7示出了图6中的屏蔽装置沿A-A方向的剖视图。如图6及图7所示，作为一种可能的实施例，屏蔽装置还可以包括第三屏蔽部500。第三屏蔽部500可以包括屏蔽膜。当屏蔽装置包括第三屏蔽部500时，屏蔽装置可以不包括第二屏蔽部。此时，屏蔽膜可以将线圈结构100、第一屏蔽部200及绝缘部300包裹在内。
具体实施时，屏蔽膜可以采用半导电皱纹纸。屏蔽膜可以均匀缠绕在绝缘部300的外壁上。屏蔽膜可以与低压电位连接，从而屏蔽膜可以处于低压电位，第三屏蔽部500可以起到低压电场屏蔽作用。
除上述的具体实施方式以外，本申请实施例提供的屏蔽装置还可以具有其他的具体实施方式。
图8示出了本申请另一实施例提供的屏蔽装置的第一屏蔽部的结构示意图，图9示出了本申请另一实施例提供的屏蔽装置的绝缘部的结构示意图，图10示出了本申请另一实施例提供的屏蔽装置的第二屏蔽部的结构示意图。如图8、图9及图10所示，作为一种可能的实施例，屏蔽装置可以用于线圈结构，线圈结构具有第一中心孔。屏蔽装置可以包括第一屏蔽部200、绝缘部300及第二屏蔽部400。
具体实施时，第一屏蔽部200可以包括屏蔽膜，具体地，屏蔽膜可以采用半导电皱纹纸。屏蔽膜可以将线圈结构包裹在内，具体地，屏蔽膜可以穿过第一中心孔并缠绕线圈结构。由于屏蔽膜穿过第一中心孔并缠绕线圈结构，所以由屏蔽膜构成的第一屏蔽部200具有第三中心孔201，第三中心孔201位于第一中心孔内，具体地，第三中心孔201可以与第一中心孔同轴设置。屏蔽膜可以与高压电位连接，从而第一屏蔽部200可以处于高压电位，第一屏蔽部200可以起到高压电场屏蔽作用。
绝缘部300可以将线圈结构及第一屏蔽部200包裹在内。绝缘部300可以具有第二中心孔301，第二中心孔301可以位于第三中心孔201内。实际应用时，变压器的铁芯(或磁芯)可以位于第二中心孔301内。
第二屏蔽部400可以包括导线，导线可以穿过第二中心孔301并缠绕线圈结构，从而构成屏蔽线圈。导线的第一端可以与低压电位连接，导线的第二端可以为断路，第二屏蔽部400可以起到低压电场屏蔽作用。
本申请实施例提供的屏蔽装置，第一屏蔽部200的屏蔽膜缠绕线圈结构并与高压电位连接，使得第一屏蔽部200可以起到高压电场屏蔽作用。第二屏蔽部400的导线缠绕线圈结构构成屏蔽线圈，导线与低压电位连接，使得第二屏蔽部400可以起到低压电场屏蔽作用。第一屏蔽部200与第二屏蔽部400共同作用，屏蔽装置的绝缘性能比较可靠，可以保证被屏蔽带电体具备良好的工频耐压能力、防雷电冲击能力，并且可以有效地抑制被屏蔽带电体的局部放电现象，延长带电体使用寿命。屏蔽装置结构比较简单，成型所需的工艺技术也比较简单，成本较低，方便应用于批量加工。
具体实施时，如图8所示，屏蔽膜可以与线圈结构的一端电连接。示例性地，线圈结构的起线与系统高压电位电连接，屏蔽膜可以与线圈结构的起线电连接。或者，屏蔽膜可以与变压器的其他高压电位连接。由此，第一屏蔽部200可以处于高压电位，第一屏蔽部200可以起到高压电场屏蔽作用。
在具体实施中，屏蔽线圈可以包括多个屏蔽线圈单元，即导线可以缠绕线圈结构多圈，每圈导线即为一个屏蔽线圈单元，多个屏蔽线圈单元构成屏蔽线圈。具体地，多个屏蔽线圈单元可以沿线圈结构的周向等间隔排布，即屏蔽线圈可以为等匝间距离线圈，从而屏蔽线圈在线圈结构周向上不同位置的电阻率差异较小，即第二屏蔽部400在线圈结构周向上不同位置的电阻率差异较小，也就是说，第二屏蔽部400的电阻率一致性较高，第二屏蔽部400具有比较均匀的电场分布，第二屏蔽部400的电场屏蔽效果比较理想，屏蔽装置的绝缘性能比较可靠。
以上，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。

Claims (10)

  1. 一种屏蔽装置，其特征在于，用于线圈结构，所述线圈结构具有第一中心孔；
    所述屏蔽装置包括第一屏蔽部和绝缘部；
    所述第一屏蔽部包括第一导线，所述第一导线穿过所述第一中心孔并缠绕所述线圈结构以构成第一屏蔽线圈，所述第一导线的第一端用于与高压电位连接，所述第一导线的第二端断路；
    所述绝缘部将所述线圈结构及所述第一屏蔽部包裹在内，所述绝缘部具有第二中心孔，所述第二中心孔位于所述第一中心孔内。
  2. 如权利要求1所述的屏蔽装置，其特征在于，所述第一屏蔽线圈包括多个第一屏蔽线圈单元，多个所述第一屏蔽线圈单元沿所述线圈结构的周向等间隔排布。
  3. 如权利要求1或2所述的屏蔽装置，其特征在于，所述第一导线的第一端与所述线圈结构的一端电连接。
  4. 如权利要求1～3任一项所述的屏蔽装置，其特征在于，还包括第二屏蔽部，所述第二屏蔽部包括第二导线，所述第二导线穿过所述第二中心孔并缠绕所述线圈结构以构成第二屏蔽线圈，所述第二导线的第一端用于与低压电位连接，所述第二导线的第二端断路。
  5. 如权利要求4所述的屏蔽装置，其特征在于，所述第二屏蔽线圈包括多个第二屏蔽线圈单元，多个所述第二屏蔽线圈单元沿所述线圈结构的周向等间隔排布。
  6. 如权利要求1～3任一项所述的屏蔽装置，其特征在于，还包括第三屏蔽部，所述第三屏蔽部包括屏蔽膜，所述屏蔽膜将所述线圈结构、所述第一屏蔽部及所述绝缘部包裹在内，所述屏蔽膜用于与低压电位连接。
  7. 一种屏蔽装置，其特征在于，用于线圈结构，所述线圈结构具有第一中心孔；
    所述屏蔽装置包括第一屏蔽部、绝缘部及第二屏蔽部；
    所述第一屏蔽部包括屏蔽膜，所述屏蔽膜将所述线圈结构包裹在内，所述屏蔽膜用于与高压电位连接；所述第一屏蔽部具有第三中心孔，所述第三中心孔位于所述第一中心孔内；
    所述绝缘部将所述线圈结构及所述第一屏蔽部包裹在内，所述绝缘部具有第二中心孔，所述第二中心孔位于所述第三中心孔内；
    所述第二屏蔽部包括导线，所述导线穿过所述第二中心孔并缠绕所述线圈结构以构成屏蔽线圈，所述导线的第一端用于与低压电位连接，所述导线的第二端断路。
  8. 如权利要求7所述的屏蔽装置，其特征在于，所述屏蔽线圈包括多个屏蔽线圈单元，多个所述屏蔽线圈单元沿所述线圈结构的周向等间隔排布。
  9. 如权利要求7或8所述的屏蔽装置，其特征在于，所述屏蔽膜与所述线圈结构的一端电连接。
  10. 一种电气设备，其特征在于，包括线圈结构，以及如权利要求1～9任一项所述的屏蔽装置。
PCT/CN2023/085058 2022-05-10 2023-03-30 屏蔽装置及电气设备 WO2023216757A1 (zh)

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