Connection changing device for a transformer

Abstract

The utility model relates to a connection change device for transformer. A connection change device for transformer comprises: a plurality of connection points, each connection point is connected with different coil tap in a plurality of coil taps of the high voltage side winding of transformer;A plurality of voltage equalizing balls, each voltage equalizing ball is configured to accommodate one of a plurality of connection nodes and is electrically connected with the corresponding connection point, so that the electric field around the corresponding connection point is homogenized;One or more connecting lines, each connecting line is configured to connect two connection points in a plurality of connection points via a corresponding voltage equalizing ball in a plurality of voltage equalizing balls, wherein the voltage that can be borne on the high voltage side winding of transformer is changed by changing the connection mode of one or more connecting lines and a plurality of connection points;And insulating oil is configured to immerse each connecting line and a plurality of voltage equalizing balls to insulate each connecting line and a plurality of voltage equalizing balls. Thus, the cost of connection change of transformer is significantly reduced.

Description

Technical Field

[0001] This utility model relates to the field of transformers, and more specifically, to a connection changing device and method for transformers. Background Technology

[0002] Transformers are typically used to convert high-voltage electricity in the power grid into voltages suitable for distribution to consumers or use in industrial equipment. When the operating conditions of the power grid change, such as when a new load is connected to the grid or when the grid topology changes, it is necessary to adjust the taps of the high-voltage winding of the transformer to adapt the transformer's output voltage to the new grid demands, thus maintaining the continuity and stability of the power supply.

[0003] In existing technologies, no-load switches are used to adjust the taps of the high-voltage windings of transformers, thereby adapting the transformer's output voltage to new grid demands. However, no-load switches have very high design and operational requirements. In high-voltage environments, they typically require special insulation and operating mechanisms, making them large, heavy, and expensive. Utility Model Content

[0004] In view of the current state and shortcomings of the technology, the purpose of this utility model is to provide a device and method for changing the connection of a transformer. This method involves setting connection points on each tap of the high-voltage winding of the transformer, and enclosing these connection points with an equalizing sphere to homogenize the electric field around them. Different connection points are connected via the equalizing sphere using connecting wires in different ways, thereby adjusting the taps of the high-voltage winding coil to adapt the transformer's output voltage to new grid requirements. This significantly reduces the cost of changing the transformer connection. Furthermore, since the connection points are located within the equalizing sphere, no additional insulation treatment is required when adjusting the transformer connection, simplifying on-site operation, improving work efficiency, and ensuring the safety and reliability of electrical performance.

[0005] According to an embodiment of the present invention, a connection changing device for a transformer is provided. The transformer includes a high-voltage side winding. The connection changing device for the transformer includes: a plurality of connection points, each connection point being connected to a different coil tap among a plurality of coil taps of the high-voltage side winding of the transformer; a plurality of equalizing spheres, each equalizing sphere being configured to accommodate one of a plurality of connection nodes and electrically connected to the corresponding connection point, so as to homogenize the electric field around the corresponding connection point; one or more connecting lines, each connecting line being configured to connect two of the plurality of connection points via a corresponding equalizing sphere among the plurality of equalizing spheres, wherein the voltage that the high-voltage side winding of the transformer can withstand is changed by changing the connection method of the one or more connecting lines to the plurality of connection points; and insulating oil, configured to immerse each connecting line and the plurality of equalizing spheres to insulate and encapsulate each connecting line and the plurality of equalizing spheres.

[0006] The transformer connection changing device according to the present invention significantly reduces the cost of transformer connection changes. Furthermore, since the connection point is located within the equalizing sphere, no additional insulation treatment is required when adjusting the transformer connection, which simplifies on-site operation, improves work efficiency, and ensures the safety and reliability of electrical performance.

[0007] The connection changing device for a transformer according to an embodiment of the present invention further includes: a cavity disposed on the transformer at a position higher than the transformer's oil tank cover, wherein multiple connection points, multiple equalizing balls, one or more connecting lines, and insulating oil are contained in the cavity.

[0008] The design of the transformer connection changing device being independent of the transformer tank and positioned above the tank cover allows for easy changes to the transformer connection. This means that when making changes, only the insulating oil needs to be drained from the cavity of the connection changing device, eliminating the need to drain the insulating oil from the transformer tank. This simplifies on-site operations and improves work efficiency.

[0009] In the connection changing device for a transformer according to an embodiment of the present invention, multiple connection points, multiple equalizing balls, one or more connecting lines, and insulating oil are contained in the transformer's oil tank.

[0010] The above method simplifies the design of connection changing devices for transformers.

[0011] In the connection changing device for a transformer according to an embodiment of the present invention, multiple connection points include terminals, bolts, weld points, or crimp points.

[0012] The above method provides a concrete example of a connection point.

[0013] The connection changing device for a transformer according to an embodiment of the present invention further includes: insulating paper covering the outside of each connection wire.

[0014] The above method ensures electrical insulation between the connecting wires and other components, preventing short circuits.

[0015] In the connection changing device for a transformer according to an embodiment of the present invention, each connecting line is configured to connect two of a plurality of connection points via a corresponding equalizing ball among a plurality of equalizing balls in a predetermined manner. The predetermined manner includes one of the following: connecting the beginning and end of a coil of the high-voltage side winding of the transformer to the two ends of a connecting line respectively; connecting at least two coils of the high-voltage side winding of the transformer in parallel; connecting at least two coils of the high-voltage side winding of the transformer in series; connecting at least two coils of the high-voltage side winding of the transformer in parallel and then in series with another coil; and connecting at least two coils of the high-voltage side winding of the transformer in series and then in parallel with another coil.

[0016] The above method provides a specific example of changing the connection method of a transformer.

[0017] In the connection changing device for a transformer according to an embodiment of the present invention, the cavity is connected to the transformer's oil tank.

[0018] The above method facilitates the connection of the connection point of the transformer connection changing device to the coil tap of the high-voltage side winding of the transformer, as well as the sharing of the connection changing device and the insulating oil in the transformer. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figures 1A to 1C A schematic diagram of a connection changing device for a transformer according to an embodiment of the present invention is shown, wherein, Figure 1A Front view of the connection change device for the transformer. Figure 1B A top view of a connection changing device for a transformer. Figure 1C A side view of the device used for changing the connection of the transformer.

[0021] Figures 2A to 2B The diagram illustrates another connection method for a connection changing device for a transformer according to an embodiment of the present invention, wherein... Figure 2A A top view of a connection changing device for a transformer. Figure 2B A side view of the device used for changing the connection of the transformer.

[0022] Figure 3 A flowchart of a method for changing the connection of a transformer according to another embodiment of the present invention is shown.

[0023] The reference numerals in the attached figures are as follows:

[0024] 1: Connection changing device for transformers

[0025] 12: Multiple equalizing pressure balls

[0026] 14: More than one connecting line

[0027] 16: Insulating oil

[0028] 121: First equal pressure ball

[0029] 122: Second equal pressure ball

[0030] 123: Third equal pressure ball

[0031] 124: Fourth equal pressure ball

[0032] 18: Cavity

[0033] 181: Cavity wall

[0034] 183: Cavity cover

[0035] S1-S4: Steps. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the protection scope of the present utility model.

[0037] This utility model provides a connection changing device for transformers. Figures 1A to 1C A schematic diagram of a connection changing device for a transformer according to an embodiment of the present invention is shown. Figure 2A and Figure 2B The diagram illustrates another connection method for a transformer connection changing device according to an embodiment of the present invention. The following is in conjunction with... Figures 1A to 1C and Figures 2A to 2B The present invention describes a connection changing device for a transformer according to an embodiment of the present invention.

[0038] like Figures 1A to 1C As shown, the connection changing device 1 for the transformer includes multiple connection points, multiple equalizing balls 12, one or more connecting lines 14, and insulating oil 16.

[0039] exist Figures 1A to 1C In this process, because multiple connection points are respectively enclosed within multiple equalizing spheres 12, therefore... Figures 1A to 1CThe multiple connection points are not shown in the figure, but the locations of the multiple equalizing balls 12 can be regarded as the locations of multiple connection points.

[0040] Each of the multiple connection points is connected to a different coil tap among the multiple coil taps of the high-voltage side winding of the transformer. That is, each coil tap of the high-voltage side winding of the transformer is connected to a connection point, which may include a terminal block, bolt, solder joint, or crimp joint. Terminal blocks provide a reliable interface between electrical equipment, circuit boards, or cables to secure conductors, thereby connecting or disconnecting current paths. Terminal blocks may include screw-type terminals, spring-loaded terminals, soldered terminals, crimped terminals, and through-hole terminals. Solder joints refer to the points in electronic circuits or electrical connections where conductors, component leads, or other conductive materials are securely bonded to connectors using a soldering process. Crimped joints refer to electrical connections between two conductors formed by pressure rather than welding or bolting; this type of connection is widely used in high-voltage power systems and in applications requiring frequent maintenance or disassembly.

[0041] exist Figures 1A to 1C The example shows the four coil taps of the high-voltage side winding of a transformer.

[0042] Each of the plurality of equalizing spheres 12 is configured to accommodate one of a plurality of connection points and is electrically connected to the corresponding connection point to homogenize the electric field around the corresponding connection point. An equalizing sphere is a component used to improve the electric field distribution in high-voltage equipment. For example, when the connection point is a bolt, the electric field strength is significantly increased at its sharp edges, which may lead to partial discharge or electrical breakdown. By encasing the bolt with an equalizing sphere, the electric field around the bolt can be made more uniform, reducing these localized effects.

[0043] exist Figures 1A to 1C The example illustrates a plurality of equalizing spheres 12, including four equalizing spheres: a first equalizing sphere 121, a second equalizing sphere 122, a third equalizing sphere 123, and a fourth equalizing sphere 124. Each of the first equalizing sphere 121, the second equalizing sphere 122, the third equalizing sphere 123, and the fourth equalizing sphere 124 encloses a connection point that connects to a coil joint of the high-voltage side winding of the transformer. However, the present invention is not limited to this; the number of equalizing spheres can be adjusted according to the number of coil joints of the high-voltage side winding of the transformer.

[0044] Each connecting line 14 is configured to connect two of a plurality of connection points via corresponding equalizing balls among a plurality of equalizing balls 12 in a predetermined manner. Specifically, Figures 1A to 1CThe diagram shows a connecting line 14. A first equalizing sphere 121 covers and accommodates the connection point connecting to the beginning of the first coil of the high-voltage winding of the transformer. A second equalizing sphere 122 covers and accommodates the connection point connecting to the end of the first coil. A third equalizing sphere 123 covers and accommodates the connection point connecting to the beginning of the second coil of the high-voltage winding of the transformer. A fourth equalizing sphere 124 covers and accommodates the connection point connecting to the end of the second coil. The two ends of the connecting line 14 are connected to the corresponding connection points within the first and second equalizing spheres 121 and 122, respectively, and thus connected to the beginning and end of the first coil of the high-voltage winding of the transformer, thereby connecting the first coil of the high-voltage winding of the transformer to the power grid.

[0045] The voltage that the high-voltage winding of a transformer can withstand can be changed by altering the connection method of one or more connecting lines and multiple connection points.

[0046] Despite Figures 1A to 1C An example is shown where a connecting line 14 is connected to the beginning and end of the first coil of the high-voltage coil side winding of a transformer via a first equalizing ball 121 and a second equalizing ball 122, but the present invention is not limited thereto.

[0047] like Figure 2A and Figure 2B As shown, two connecting lines 14 are illustrated. The two ends of the first connecting line 14 are connected to the beginning ends of the first coil and the beginning ends of the second coil via a first equalizing ball 121 and a third equalizing ball 123. The two ends of the second connecting line 14 are connected to the end ends of the first coil and the end ends of the second coil via a second equalizing ball 122 and a fourth equalizing ball 124, thereby connecting the first coil and the second coil in parallel. Besides... Figures 1A to 1C and Figures 2A to 2B In addition to the connection methods shown, the connecting line 14 can also connect two of the multiple connection points via corresponding equalizing balls in the plurality of equalizing balls in the following ways: connecting at least two coils of the high-voltage side winding of the transformer in series; connecting at least two coils of the high-voltage side winding of the transformer in parallel and then connecting them in series with another coil; and connecting at least two coils of the high-voltage side winding of the transformer in series and then connecting them in parallel with another coil. The specific connection method can be set as needed.

[0048] Insulating oil 16 is configured to immerse each connecting wire 14 and the plurality of equalizing balls 12 to provide insulating encapsulation for each connecting wire 14 and the plurality of equalizing balls 12. Insulating oil typically serves as insulation and cooling in transformers; common insulating oils include mineral oil, vegetable oil, synthetic oil, fluorinated liquid, and nano oil.

[0049] like Figures 1A to 1CAs shown, the connection changing device 1 for the transformer may further include a cavity 18, which includes a cavity wall 181 and a cavity cover 183. The cavity cover 183 covers the cavity wall 181 and together with the cavity wall 181 forms an internal space surrounded by the cavity wall 181 and the cavity cover 183. Multiple connection points, multiple equalizing balls 12, one or more connecting lines 14, and insulating oil 16 are accommodated in this internal space.

[0050] The cavity 18 can be installed on the transformer at a position higher than the transformer's oil tank cover. This design allows for changes to the transformer's connections only requiring the discharge of insulating oil 16 from the cavity 18 of the transformer connection change device 1, eliminating the need to drain the insulating oil from the transformer's oil tank. This simplifies on-site operations and improves work efficiency.

[0051] The cavity 18 is connected to the transformer's oil tank, and the insulating oil 16 in the cavity 18 is the same as the insulating oil in the transformer's oil tank. This facilitates the connection of the connection point of the transformer connection changing device 1 to the coil tap of the transformer's high-voltage winding, as well as the sharing of insulating oil between the transformer connection changing device 1 and the transformer's oil tank.

[0052] Optionally, multiple connection points, multiple equalizing balls 12, one or more connecting lines 14, and insulating oil 16 can be housed within the transformer's oil tank. That is, the transformer's oil tank is used as a cavity for the transformer's connection changing device 1, which simplifies the design of the transformer's connection changing device 1.

[0053] The connection changing device 1 for the transformer may further include insulating paper covering the outside of each connection wire 14, which ensures electrical insulation between the connection wire and other components and prevents short circuits.

[0054] The transformer connection changing device according to the present invention significantly reduces the cost of transformer connection changes. Furthermore, since the connection point is located within the equalizing sphere, no additional insulation treatment is required when adjusting the transformer connection, which simplifies on-site operation, improves work efficiency, and ensures the safety and reliability of electrical performance.

[0055] According to another embodiment of the present invention, a method for changing the connection of a transformer is provided, the method utilizing the above combination Figures 1A to 1C and Figures 2A to 2B The described connection changing device 1 for transformers is used to change the connection of the transformer. For clarity, the structural details related to the above-described connection changing device for transformers will not be repeated in the following description. That is, the above description of the connection changing device for transformers also applies to the following description of the connection changing method for transformers.

[0056] Figure 3 A flowchart of a method for changing the connection of a transformer according to another embodiment of the present invention is shown.

[0057] like Figure 3 As shown, when it is necessary to change the connection of the transformer, the method for changing the connection of the transformer according to another embodiment of the present invention includes steps S1 to S4.

[0058] In step S1, at least a portion of the insulating oil in the transformer connection changing device 1 is discharged until the plurality of equalizing balls 12 and at least one connecting line 14 are not submerged in the insulating oil 16.

[0059] Combination Figures 1A to 1C and Figures 2A to 2B Specifically, a portion of the insulating oil 16 within the cavity 18 of the transformer connection changing device 1 is drained until multiple equalizing balls 12 and at least one connecting wire 14 are exposed. By controlling the oil level, it can be ensured that the operator can safely access and adjust the connecting wires in subsequent steps.

[0060] In step S2, all existing connecting wires 14 are removed from the plurality of equalizing balls 12.

[0061] Specifically, after the level of the insulating oil 16 has dropped to the point where multiple equalizing balls 12 and at least one connecting wire 14 are exposed, all existing connecting wires 14 can be removed from the multiple equalizing balls 12.

[0062] In step S3, the new connecting line is connected to the connection point in the corresponding equalizing ball of the plurality of equalizing balls 12 in a predetermined manner.

[0063] Specifically, the connection method of the high-voltage side winding of the transformer is determined according to the requirements of the power grid to which the transformer is to be connected. Based on the determined connection method, multiple equalizing spheres are connected with new connecting wires, and then the connection points in the corresponding equalizing spheres are connected, thereby connecting the desired high-voltage side winding coil into the power grid.

[0064] In step S4, insulating oil 16 is injected into the connection changing device 1 for the transformer until the plurality of equalizing balls 12 and the new connecting wires are immersed in the insulating oil 16.

[0065] Specifically, after all the connecting wires have been reconnected, insulating oil 16 is re-injected into the connection changing device 1 for the transformer until the multiple equalizing balls 12 and the new connecting wires are completely submerged in the insulating oil 16. The re-injection of insulating oil not only ensures the insulation between the components within the connection changing device 1 for the transformer, but also ensures that the insulating oil cools and protects the components within the connection changing device 1 for the transformer, thus guaranteeing the stable operation of the transformer after the connection change.

[0066] The method for changing transformer connections according to embodiments of this utility model significantly reduces the cost of changing transformer connections. Furthermore, since the connection points are located within the equalizing sphere, no additional insulation treatment is required when adjusting the transformer connections. This simplifies on-site operations, improves work efficiency, and simultaneously ensures the safety and reliability of electrical performance.

[0067] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A connection changing device (1) for a transformer, the transformer including a high-voltage side winding, characterized in that, The connection changing device (1) for the transformer includes: Multiple connection points, each connection point being connected to a different coil tap among multiple coil taps of the high-voltage side winding of the transformer; Multiple equalizing spheres (12), each sphere being configured to accommodate one of the multiple connection points and electrically connected to the corresponding connection point, so as to homogenize the electric field around the corresponding connection point; One or more connecting lines (14), each connecting line being configured to connect two of the plurality of connection points via a corresponding equalizing ball (12), wherein the voltage that the high-voltage winding of the transformer can withstand is changed by altering the connection method between the one or more connecting lines and the plurality of connection points; and Insulating oil (16) is configured to immerse each connecting wire and the plurality of equalizing balls to provide an insulating seal for each connecting wire and the plurality of equalizing balls.

2. The connection changing device (1) for a transformer according to claim 1, characterized in that, Further includes: The cavity (18) is located on the transformer at a position higher than the transformer's tank cover. The plurality of connection points, the plurality of equalizing balls (12), the one or more connecting lines (14), and the insulating oil (16) are housed in the cavity (18).

3. The connection changing device (1) for a transformer according to claim 2, characterized in that, The plurality of connection points, the plurality of equalizing balls (12), the one or more connecting lines (14), and the insulating oil (16) are housed in the oil tank of the transformer.

4. The connection changing device (1) for a transformer according to claim 1 or 2, characterized in that, The plurality of connection points include terminals, bolts, solder joints, or crimp joints.

5. The connection changing device (1) for a transformer according to claim 1 or 2, characterized in that, Further includes: Insulating paper covering the outside of each connecting wire.

6. The connection changing device (1) for a transformer according to claim 1 or 2, characterized in that, Each connecting line is configured to connect two of the plurality of connecting points via a corresponding equalizing ball in a predetermined manner, the predetermined manner including one of the following: Connect the beginning and end of one coil of the high-voltage side winding of the transformer to the two ends of a connecting line, respectively. At least two coils of the high-voltage side winding of the transformer are connected in parallel; Connect at least two coils of the high-voltage side winding of the transformer in series; The transformer's high-voltage side winding is connected in parallel with at least two coils, and then connected in series with another coil; and At least two coils of the high-voltage side winding of the transformer are connected in series and then connected in parallel with another coil.

7. The connection changing device (1) for a transformer according to claim 2, characterized in that, The cavity (18) is connected to the oil tank of the transformer.

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