Three-body 220kV phase-shifting transformer

Abstract

The utility model discloses a three-body 220kV phase-shifting transformer. The three-body 220kV phase-shifting transformer comprises a phase-shifting transformer body and a diversion assembly, the diversion assembly is arranged on the phase-shifting transformer body; the flow guide assembly comprises a fixed plate, a flow guide block and a lug plate; the two fixing plates are symmetrically and fixedly arranged on the phase-shifting transformer body; the two diversion blocks are arranged on the two sides of the phase-shifting transformer body in a central symmetry manner; the two lug plates are fixedly arranged on the sides, away from each other, of the two flow guide blocks, and the lug plates are connected with the fixing plate through three bolts. The three-body 220kV phase-shifting transformer has the advantages that the three-body 220kV phase-shifting transformer is simple and reasonable in structure and ingenious in design, natural wind is guided, the flowing path of the natural wind is prolonged, the heat dissipation effect of the phase-shifting transformer body can be improved, the heat dissipation efficiency of the phase-shifting transformer body is improved, and the service life of the three-body 220kV phase-shifting transformer is prolonged. And the utilization rate of natural wind can be increased.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, specifically a three-body 220kV phase-shifting transformer. Background Technology

[0002] A three-core 220kV phase-shifting transformer is a type of transformer with three cores (usually referring to iron cores), a rated voltage of 220kV, and a phase-shifting function. This type of transformer is commonly used in high-voltage transmission systems to achieve phase adjustment and voltage transformation.

[0003] The phase-shifting transformer disclosed in Chinese Utility Model Patent No. CN202230853U includes a primary high-voltage winding and two or more secondary low-voltage windings. Each secondary low-voltage winding is phase-shifted by a certain electrical angle and is distributed along the transformer core axis. Each phase of the primary high-voltage winding consists of two or more parallel sub-windings, each insulated from the others and evenly distributed vertically along the transformer core axis. This utility model divides each phase winding on the high-voltage side into several parallel sub-windings and distributes them evenly vertically along the transformer core axis, making the magnetomotive force distribution on both the primary and secondary sides more uniform, thereby significantly reducing the impedance deviation rate of each secondary winding. This utility model's technical solution can be applied to phase-shifting transformers.

[0004] Outdoor 220kV phase-shifting transformers generate heat during operation. To ensure their normal operation, natural air cooling is typically used. However, in existing systems, the natural airflow directly passes over the transformer, limiting the amount of heat carried away and resulting in low utilization of the airflow. This negatively impacts the transformer's performance. Utility Model Content

[0005] The purpose of this invention is to provide a three-body 220kV phase-shifting transformer to solve the problem of poor heat dissipation mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a three-body 220kV phase-shifting transformer, comprising a phase-shifting transformer body and a current-conducting assembly; the current-conducting assembly is arranged on the phase-shifting transformer body; the current-conducting assembly includes a fixing plate, a current-conducting block, and an ear plate; two fixing plates are symmetrically fixed on the phase-shifting transformer body; two current-conducting blocks are symmetrically arranged on both sides of the phase-shifting transformer body; two ear plates are fixed on opposite sides of the two current-conducting blocks, and the ear plates are connected to the fixing plates by at least one bolt.

[0007] Preferably, the current guide block has a right-angled triangular structure, and the inclined surface of the current guide block is positioned close to the phase-shifting transformer body.

[0008] Preferably, it also includes a flow extension component; the flow extension component is arranged on the flow guide block.

[0009] Preferably, the flow extension component includes a flow extension groove and a flow convergence groove; a plurality of flow extension grooves are linearly arrayed on the inclined surface of the flow guide block; and a flow convergence groove is formed within the flow extension groove.

[0010] Preferably, the flow channel is an inclined structure, and the inclination direction of the flow channel is opposite to the inclination direction of the guide block.

[0011] Preferably, the flow-gathering channel has an arc-shaped structure, and the flow-gathering channel is connected to the flow-extending channel.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model, by setting a flow guiding component and fixing the ear plate to the fixed plate with bolts, fixes the position of the flow guiding block. Then, when natural wind blows over the flow guiding block, the inclined surface on the flow guiding block can extend the flow path of the natural wind, increasing the time that the natural wind flows around the phase-shifting transformer body. Compared with the prior art, this utility model has a simple and reasonable structure and ingenious design. By guiding the natural wind and extending its flow path, it can not only improve the heat dissipation effect of the phase-shifting transformer body, but also improve the utilization rate of natural wind.

[0014] 2. By setting up a flow extension component, the natural wind will enter the flow extension groove when it flows on the inclined surface of the guide block. Since the flow extension groove is an inclined structure, it will further extend the flow path of the natural wind. The natural wind entering the flow extension groove will gather in the flow convergence groove and flow back, which will further increase the flow time of the natural wind around the phase-shifting transformer body. Attached Figure Description

[0015] Figure 1 This is the overall structural electrical symbol and system wiring diagram for Example 1;

[0016] Figure 2 This is a wiring diagram of the overall structure of Example 1;

[0017] Figure 3 This is a schematic diagram of the overall structure of a single fuel tank in Example 1;

[0018] Figure 4 This is a schematic diagram of the overall structure of the dual fuel tank arrangement in Example 1;

[0019] Figure 5 This is a schematic diagram of the overall structure of the Adam's apple in Example 1;

[0020] Figure 6 This is a schematic diagram of the overall structure of Example 2;

[0021] Figure 7 This is a schematic diagram of the flow guide block in Example 2.

[0022] In the picture:

[0023] 1. S terminal; 2. L terminal; 3. Series unit body; 4. Coarse adjustment excitation unit body; 5. Fine adjustment excitation unit body; 6. Series unit core; 7. Series unit series winding; 8. Series unit excitation winding; 9. Coarse adjustment excitation unit core; 10. Coarse adjustment excitation unit excitation winding; 11. Coarse adjustment excitation unit phase-shifting winding; 12. On-load tap changer A; 13. Fine adjustment excitation unit core; 14. Fine adjustment excitation unit core; 15. Fine-tuning excitation unit excitation winding; 16. On-load tap changer B; 17. Excitation neutral point; 18. Phase-shifting neutral point; 19. Throat lead; 20. Oil tank; 30. Phase-shifting transformer body; 40. Current guiding assembly; 50. Current extending assembly; 4001. Fixing plate; 4002. Current guiding block; 4003. Ear plate; 5001. Current extending slot; 5002. Current concentrating slot. Detailed Implementation

[0024] 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 are within the protection scope of the present utility model.

[0025] Example 1:

[0026] Please see Figures 1 to 5This utility model provides a technical solution: a three-body 220kV phase-shifting transformer, comprising an S-terminal 1, an L-terminal 2, a series unit body 3, a coarse adjustment excitation unit body 4, a fine adjustment excitation unit body 5, a series unit core 6, a series unit series winding 7, a series unit excitation winding 8, a coarse adjustment excitation unit core 9, a coarse adjustment excitation unit excitation winding 10, a coarse adjustment excitation unit phase-shifting winding 11, an on-load tap changer A12, a fine adjustment excitation unit core 13, a fine adjustment excitation unit excitation winding 14, a fine adjustment excitation unit phase-shifting winding 15, an on-load tap changer B16, an excitation neutral point 17, a phase-shifting neutral point 18, a throat lead 19, and an oil tank 20, etc.

[0027] The series unit body 3 comprises a series unit core 6, a series unit series winding 7, and a series unit excitation winding 8. The series unit core 6 is a three-phase three-limb or five-limb core, clamped together with clips. The unit body adopts an integral assembly structure, with a pressure plate pressing the upper end and a support plate supporting the lower end. Large oil gaps are separated by partitions, reducing the main insulation distance and making the overall structure more compact. The series unit series winding 7 leads are routed from both ends, connecting to the 220kV transmission line via S-terminal 1 and L-terminal 2 respectively. The series unit excitation winding 8 is connected to the on-load tap changer A12 after being connected in a delta configuration.

[0028] The coarse adjustment excitation unit body 4 comprises a coarse adjustment excitation unit core 9, a coarse adjustment excitation unit excitation winding 10, and a coarse adjustment excitation unit phase-shifting winding 11. The coarse adjustment excitation unit core 9 is a three-phase, three-limb or five-limb core, clamped together with clips. The unit body adopts an integral assembly structure, with a pressure plate pressing the upper end and a support plate supporting the lower end. Large-volume oil gaps are separated by partitions, reducing the main insulation distance and making the overall structure more compact. The coarse adjustment excitation unit excitation winding 10 has a center lead. For a symmetrical phase-shifting structure, this lead is connected to the center lead of the series winding 7 of the series unit via a throat lead 19; for an asymmetrical phase-shifting structure, this lead is connected to the end lead of the series winding 7 of the series unit via a throat lead 19. The coarse adjustment excitation unit's excitation winding 10 provides excitation to the coarse adjustment excitation unit's phase-shifting winding 11. The tap lead of the coarse adjustment excitation unit's phase-shifting winding 11 is connected to the on-load tap changer A12. When the on-load tap changer A12 is in a positive tap position, the phase angle on the L side leads the S side; when the on-load tap changer A12 is in a negative tap position, the phase angle on the L side lags behind the S side. By reducing the number of turns in the coarse adjustment excitation unit's phase-shifting winding 11, the phase angle can be reduced; by increasing the number of turns in the coarse adjustment excitation unit's phase-shifting winding 11, the phase angle can be increased. The end of the coarse adjustment excitation unit's excitation winding 10 is connected to the fine adjustment excitation unit's excitation winding 14, providing it with the fine adjustment excitation voltage.

[0029] The fine-tuning excitation unit body 5 comprises a fine-tuning excitation unit core 13, a fine-tuning excitation unit excitation winding 14, and a fine-tuning excitation unit phase-shifting winding 15. The fine-tuning excitation unit core 13 is a three-phase, three-limb or five-limb core, clamped together with clips. The body adopts an integral assembly structure, with a pressure plate pressing the body at the upper end and a support plate supporting the body at the lower end. Large-volume oil gaps are separated by partitions, reducing the main insulation distance and making the overall structure more compact. The fine-tuning excitation unit excitation winding 14 uses end-out leads, with the first end connected to the end of the coarse-tuning excitation unit excitation winding 10. The fine-tuning excitation unit's excitation winding 14 provides excitation to the fine-tuning excitation unit's phase-shifting winding 15. The tap lead of the fine-tuning excitation unit's phase-shifting winding 15 is connected to the on-load tap changer B16. When the on-load tap changer B16 is in a positive tap position, the phase angle on the L side leads the S side; when the on-load tap changer B16 is in a negative tap position, the phase angle on the L side lags behind the S side. By reducing the number of turns in the fine-tuning excitation unit's phase-shifting winding 15, the phase angle can be reduced; by increasing the number of turns in the fine-tuning excitation unit's phase-shifting winding 15, the phase angle can be increased. The end of the fine-tuning excitation unit's excitation winding 14 is connected to the excitation neutral point 17.

[0030] Similar to the connection between the coarse adjustment excitation unit excitation winding 10 and the fine adjustment excitation unit excitation winding 14, the coarse adjustment excitation unit phase-shifting winding 11 and the fine adjustment excitation unit phase-shifting winding 15 are also connected end to end by a tap changer. One end is connected to the series unit excitation winding 8 to provide phase-shifting excitation for the series unit series winding 7 of the series unit body 3, and the other end is connected to the phase-shifting neutral point 18.

[0031] Example 2:

[0032] Please see Figures 6 to 7 This utility model provides a technical solution: a three-body 220kV phase-shifting transformer, including a phase-shifting transformer body 30 and a current-conducting assembly 40; the current-conducting assembly 40 is arranged on the phase-shifting transformer body 30; the current-conducting assembly 40 includes a fixing plate 4001, a current-conducting block 4002 and an ear plate 4003; two fixing plates 4001 are symmetrically fixed on the phase-shifting transformer body 30; two current-conducting blocks 4002 are symmetrically arranged on both sides of the phase-shifting transformer body 30; two ear plates 4003 are fixed on the opposite side of the two current-conducting blocks 4002, and the ear plates 4003 are connected to the fixing plates 4001 by three bolts; the current-conducting block 4002 has a right-angled triangular structure, and the inclined surface of the current-conducting block 4002 is arranged close to the phase-shifting transformer body 30.

[0033] This invention, by setting a flow guiding component 40 and fixing the ear plate 4003 to the fixing plate 4001 with bolts, fixes the position of the flow guiding block 4002. Then, when natural wind blows over the flow guiding block 4002, the inclined surface on the flow guiding block 4002 can extend the flow path of the natural wind, increasing the time that the natural wind flows around the phase-shifting transformer body 30. Compared with the prior art, this invention has a simple and reasonable structure and ingenious design. By guiding the natural wind and extending its flow path, it can not only improve the heat dissipation effect of the phase-shifting transformer body 30, but also improve the utilization rate of the natural wind.

[0034] As a preferred embodiment, it also includes a flow-extending component 50; the flow-extending component 50 is arranged on the flow-guiding block 4002; the flow-extending component 50 includes a flow-extending groove 5001 and a flow-gathering groove 5002; a plurality of flow-extending grooves 5001 are linearly arrayed on the inclined surface of the flow-guiding block 4002; a flow-gathering groove 5002 is formed in the flow-extending groove 5001; the flow-extending groove 5001 is an inclined structure, and the inclination direction of the flow-extending groove 5001 is opposite to the inclination direction of the flow-guiding block 4002; the flow-gathering groove 5002 is an arc-shaped structure, and the flow-gathering groove 5002 is connected to the flow-extending groove 5001.

[0035] By setting up the flow extension component 50, the natural wind will enter the flow extension groove 5001 when it flows on the inclined surface of the guide block 4002. Since the flow extension groove 5001 is an inclined structure, it will further extend the flow path of the natural wind. The natural wind entering the flow extension groove 5001 will be gathered in the flow convergence groove 5002 and will flow back, which will further increase the flow time of the natural wind around the phase shift transformer body 30.

[0036] Working principle: In use, firstly, the ear plate 4003 is fixed to the fixed plate 4001 with bolts, so that the position of the guide block 4002 is fixed. Then, when the natural wind blows over the guide block 4002, the inclined surface on the guide block 4002 can extend the flow path of the natural wind. When the natural wind flows on the inclined surface of the guide block 4002, it will enter the extension groove 5001. Since the extension groove 5001 is an inclined structure, it will further extend the flow path of the natural wind, increasing the time for the natural wind to flow around the phase-shifting transformer body 30. The natural wind entering the extension groove 5001 will be gathered in the convergence groove 5002 and backflow will occur, further increasing the flow time of the natural wind around the phase-shifting transformer body 30.

[0037] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-body 220kV phase-shifting transformer, characterized in that, The transformer includes a phase-shifting transformer body (30) and a current-conducting assembly (40); the current-conducting assembly (40) is arranged on the phase-shifting transformer body (30); the current-conducting assembly (40) includes a fixing plate (4001), a current-conducting block (4002) and an ear plate (4003); two fixing plates (4001) are symmetrically fixed on the phase-shifting transformer body (30); two current-conducting blocks (4002) are symmetrically arranged on both sides of the phase-shifting transformer body (30); two ear plates (4003) are fixed on the opposite side of the two current-conducting blocks (4002), and the ear plates (4003) are connected to the fixing plates (4001) by at least one bolt.

2. A three-body 220kV phase-shifting transformer according to claim 1, characterized in that, The current guide block (4002) has a right-angled triangular structure, and the inclined surface of the current guide block (4002) is set close to the phase-shifting transformer body (30).

3. A three-body 220kV phase-shifting transformer according to claim 2, characterized in that, It also includes a flow extension component (50); the flow extension component (50) is arranged on the flow guide block (4002).

4. A three-body 220kV phase-shifting transformer according to claim 3, characterized in that, The flow extension component (50) includes a flow extension groove (5001) and a flow convergence groove (5002); the flow guide block (4002) has a plurality of flow extension grooves (5001) arranged in a linear array on its inclined surface; the flow extension groove (5001) has a flow convergence groove (5002) inside it.

5. A three-body 220kV phase-shifting transformer according to claim 4, characterized in that, The flow channel (5001) is an inclined structure, and the inclination direction of the flow channel (5001) is opposite to the inclination direction of the guide block (4002).

6. A three-body 220kV phase-shifting transformer according to claim 5, characterized in that, The flow-gathering channel (5002) has an arc-shaped structure, and the flow-gathering channel (5002) is connected to the flow-extending channel (5001).

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