A three-body 220kV phase-shifting transformer

Abstract

The present invention discloses a three-body 220kV phase-shifting transformer, comprising a phase-shifting transformer body and a guide assembly; the guide assembly is arranged on the phase-shifting transformer body; the guide assembly comprises a fixed plate, a guide block and an ear plate; two of the fixed plates are symmetrically fixed on the phase-shifting transformer body; two of the guide blocks are centrally symmetrically arranged on both sides of the phase-shifting transformer body; two of the ear plates are fixed on the opposite sides of the two guide blocks, and the ear plates are connected to the fixed plates by three bolts; the guide blocks are of a right-angled triangle structure, and the inclined surface of the guide blocks is arranged close to the direction of the phase-shifting transformer body. The three-body 220kV phase-shifting transformer has a simple and reasonable structure and a clever design. By guiding the natural wind and extending the flow path of the natural wind, not only the heat dissipation effect of the phase-shifting transformer body can be improved, but also the utilization rate of the natural wind can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to a three-body 220kV phase-shifting transformer. Background Art

[0002] Three-body 220kV phase-shifting transformer refers to a transformer with three bodies (usually iron cores), with a rated voltage of 220kV and a phase-shifting function. This transformer is usually used in high-voltage power transmission systems to achieve phase adjustment and voltage conversion.

[0003] For example, the phase-shifting transformer provided by the Chinese invention patent with publication number CN202230853U includes a primary high-voltage winding and two or more groups of secondary low-voltage windings; each group of the secondary low-voltage windings is phase-shifted by a certain electrical angle, and the secondary low-voltage windings are distributed along the axial direction of the transformer core; each phase of the primary high-voltage winding is composed of more than two sub-windings connected in parallel, and each sub-winding is separated by an insulation space and evenly distributed up and down along the axial direction of the transformer core. The present invention divides each phase winding on the high-voltage side into several sub-windings connected in parallel and evenly distributes them up and down along the axial direction of the transformer core, so that the magnetic potential distribution of the windings on the primary and secondary sides has become more relatively uniform, thereby greatly reducing the impedance deviation rate of each secondary winding. The technical solution of the present invention can be applied to phase-shifting transformers.

[0004] The three-body 220kV phase-shifting transformer used outdoors will generate heat when working. In order to ensure the normal operation of the three-body 220kV phase-shifting transformer, it is usually subjected to natural air cooling to achieve the heat dissipation effect. However, when the existing three-body 220kV phase-shifting transformer is subjected to natural air cooling to dissipate heat, the natural wind in the air directly blows through the three-body 220kV phase-shifting transformer, so that the heat taken away by the natural wind of the three-body 220kV phase-shifting transformer is limited, resulting in a low utilization rate of the natural wind in the three-body 220kV phase-shifting transformer, thereby affecting the use effect of the three-body 220kV phase-shifting transformer. Summary of the invention

[0005] The object of the present invention is to provide a three-body 220kV phase-shifting transformer to solve the problem of poor heat dissipation effect mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a three-body 220kV phase-shifting transformer, comprising a phase-shifting transformer body and a guide assembly; the guide assembly is arranged on the phase-shifting transformer body; the guide assembly comprises a fixed plate, a guide block and an ear plate; the two fixed plates are symmetrically fixed on the phase-shifting transformer body; the two guide blocks are centrally symmetrically arranged on both sides of the phase-shifting transformer body; the two ear plates are fixed on the opposite sides of the two guide blocks, and the ear plates are connected to the fixed plate by at least one bolt.

[0007] Preferably, the guide block is a right-angle triangle structure, and the inclined surface of the guide block is arranged close to the direction of the phase-shifting transformer body.

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

[0009] Preferably, the flow extension component includes a flow extension groove and a flow focusing groove; a plurality of flow extension grooves are provided in a linear array on the inclined surface of the guide block; and a flow focusing groove is provided in the flow extension groove.

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

[0011] Preferably, the flow concentrating groove is an arc-shaped structure, and the flow concentrating groove is connected with the flow extension groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. The present invention fixes the position of the guide block by setting a guide assembly and fixing the ear plate to the fixed plate by bolts. Then, when the natural wind blows over the guide block, the inclined surface on the guide block can extend the flow path of the natural wind, so that the time for the natural wind to flow around the phase-shifting transformer body is increased. Compared with the prior art, the present invention has a simple and reasonable structure and a clever design. By guiding the natural wind and extending the flow path of the natural wind, not only the heat dissipation effect of the phase-shifting transformer body can be improved, but also the utilization rate of the natural wind can be improved.

[0014] 2. The present invention sets a flow extension component. When the natural wind flows on the inclined surface of the guide block, it will enter the flow extension groove. Since the flow extension groove is an inclined structure, the flow path of the natural wind will be further extended, and the natural wind entering the flow extension groove will be gathered in the gathering groove and reflux, further increasing the flow time of the natural wind around the phase-shifting transformer body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The overall structure electrical symbols and system wiring diagram of Example 1;

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

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

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

[0019] Figure 5This is a schematic diagram of the overall structure of the Adam's apple connection of 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 guide block of Example 2.

[0022] In the figure:

[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 shift winding; 12. On-load tap changer A; 13. Fine adjustment excitation unit core; 14. Fine adjustment Adjust the excitation unit excitation winding; 15. Fine-tune the excitation unit phase-shifting winding; 16. On-load tap changer B; 17. Excitation neutral point; 18. Phase-shifting neutral point; 19. Adam's apple lead; 20. Oil tank; 30. Phase-shifting transformer body; 40. Guide assembly; 50. Flow extension assembly; 4001. Fixed plate; 4002. Guide block; 4003. Ear plate; 5001. Flow extension trough; 5002. Flow focusing trough. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Embodiment 1:

[0026] See also Figures 1 to 5 The present invention provides a technical solution: a three-body 220kV phase-shifting transformer, including an S end 1, an L end 2, a series unit body 3, a coarse adjustment excitation unit body 4, a fine adjustment excitation unit body 5, a series unit iron core 6, a series unit series winding 7, a series unit excitation winding 8, a coarse adjustment excitation unit iron core 9, a coarse adjustment excitation unit excitation winding 10, a coarse adjustment excitation unit phase-shifting winding 11, an on-load tap changer A 12, a fine adjustment excitation unit iron core 13, a fine adjustment excitation unit excitation winding 14, a fine adjustment excitation unit phase-shifting winding 15, an on-load tap changer B 16, an excitation neutral point 17, a phase-shifting neutral point 18, a laryngeal apple lead 19, an oil tank 20, etc.

[0027] The series unit body 3 includes a series unit core 6, a series unit series winding 7, and a series unit excitation winding 8. The series unit core 6 adopts a three-phase three-column or five-column core, and the iron core is clamped with a clamp. The body adopts an integral set structure, the upper end is pressed with a pressing plate, and the lower end is supported by a supporting plate. The large volume oil gap is separated by a partition, the main insulation distance is reduced, and the overall structure is more compact. The lead wire of the series unit series winding 7 adopts the upper and lower ends, and is connected to the 220kV transmission line through the S end 1 and the L end 2 respectively. The series unit excitation winding 8 is connected to the on-load tap changer A12 after being connected in a triangle.

[0028] The coarse adjustment excitation unit body 4 includes a coarse adjustment excitation unit core 9, a coarse adjustment excitation unit excitation winding 10, and a coarse adjustment excitation unit phase shift winding 11. The coarse adjustment excitation unit core 9 adopts a three-phase three-column or five-column core, and the core pieces are clamped with a clamp. The body adopts an integral set structure, the upper end is pressed with a pressing plate, and the lower end is supported by a supporting plate. The large volume oil gap is separated by a partition, the main insulation distance is reduced, and the overall structure is more compact. The lead of the coarse adjustment excitation unit excitation winding 10 adopts a middle lead. For a symmetrical phase-shifting structure, the lead is connected to the middle lead of the series winding 7 of the series unit through a larynx lead 19; for an asymmetrical phase-shifting structure, the lead is connected to the end lead of the series winding 7 of the series unit through a larynx lead 19. The coarse excitation unit excitation winding 10 provides excitation for the coarse excitation unit phase-shift winding 11. The tap lead of the coarse excitation unit phase-shift winding 11 is connected to the on-load tap changer A12. When the on-load tap changer A12 is in the positive tap, the phase angle on the L side is ahead of the S side; when the on-load tap changer A12 is in the negative tap, the phase angle on the L side lags behind the S side. By reducing the number of turns of the coarse excitation unit phase-shift winding 11, the size of the phase angle can be reduced; by increasing the number of turns of the coarse excitation unit phase-shift winding 11, the size of the phase angle can be increased. The end of the coarse excitation unit excitation winding 10 is connected to the fine excitation unit excitation winding 14 to provide it with a fine excitation voltage.

[0029] The fine-tuning excitation unit body 5 includes 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 adopts a three-phase three-column or five-column core, and the core sheet is clamped with a clamp. The body adopts an integral set structure, and the upper end is pressed by a pressing plate, and the lower end is supported by a supporting plate. The large volume oil gap is separated by a partition, and the main insulation distance is reduced to make the overall structure more compact. The lead wire of the fine-tuning excitation unit excitation winding 14 adopts an end-out line, and the first end is connected to the end of the coarse-tuning excitation unit excitation winding 10. The fine-tuning excitation unit excitation winding 14 provides excitation for the fine-tuning excitation unit phase-shifting winding 15. The tapping lead of the fine-tuning excitation unit phase-shifting winding 15 is connected to the on-load tap changer B16. When the on-load tap changer B16 is in the positive tap, the phase angle on the L side is ahead of the S side; when the on-load tap changer B16 is in the negative tap, the phase angle on the L side lags behind the S side. By reducing the number of turns of the fine-tuning excitation unit phase-shifting winding 15, the size of the phase angle can be reduced; by increasing the number of turns of the fine-tuning excitation unit phase-shifting winding 15, the size of the phase angle can be increased. The end of the fine-tuning excitation unit 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 shift winding 11 and the fine adjustment excitation unit phase shift winding 15 are also connected end to end through a tap switch, with one end connected to the series unit excitation winding 8 to provide phase shift excitation for the series unit series winding 7 of the series unit body 3, and the other end connected to the phase shift neutral point 18.

[0031] Embodiment 2:

[0032] See also Figure 6 to Figure 7 The present invention provides a technical solution: a three-body 220kV phase-shifting transformer, comprising a phase-shifting transformer body 30 and a guide assembly 40; the guide assembly 40 is arranged on the phase-shifting transformer body 30; the guide assembly 40 comprises a fixed plate 4001, a guide block 4002 and an ear plate 4003; two fixed plates 4001 are symmetrically fixed on the phase-shifting transformer body 30; two guide blocks 4002 are centrally symmetrically arranged on both sides of the phase-shifting transformer body 30; two ear plates 4003 are fixed on the opposite sides of the two guide blocks 4002, and the ear plates 4003 are connected to the fixed plates 4001 by three bolts; the guide block 4002 is a right-angled triangle structure, and the inclined surface of the guide block 4002 is arranged close to the direction of the phase-shifting transformer body 30.

[0033] The present invention sets a guide assembly 40, fixes the ear plate 4003 on the fixed plate 4001 by bolts, so that the position of the guide block 4002 is fixed. Then, when 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, thereby increasing the time that the natural wind flows around the phase-shifting transformer body 30. Compared with the prior art, the present invention has a simple and reasonable structure and a clever design. By guiding the natural wind and extending the flow path of the natural wind, not only the heat dissipation effect of the phase-shifting transformer body 30 can be improved, but also the utilization rate of the natural wind can be improved.

[0034] As a preferred embodiment, it also includes a flow extension component 50; the flow extension component 50 is arranged on the guide block 4002; the flow extension component 50 includes a flow extension groove 5001 and a flow focusing groove 5002; a plurality of flow extension grooves 5001 are provided in a linear array on the inclined surface of the guide block 4002; a flow focusing groove 5002 is provided in the flow extension groove 5001; the flow extension groove 5001 is an inclined structure, and the inclination direction of the flow extension groove 5001 is opposite to the inclination direction of the guide block 4002; the flow focusing groove 5002 is an arc structure, and the flow focusing groove 5002 is connected to the flow extension groove 5001.

[0035] The present invention sets a flow extension component 50. When the natural wind flows on the inclined surface of the guide block 4002, it will enter the flow extension groove 5001. Since the flow extension groove 5001 is an inclined structure, the flow path of the natural wind will be further extended, and the natural wind entering the flow extension groove 5001 will be gathered in the gathering groove 5002 and reflux, further increasing the flow time of the natural wind around the phase-shifting transformer body 30.

[0036] Working principle: When in use, first, fix the ear plate 4003 to the fixed plate 4001 by bolts to fix the position of the guide block 4002, and 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, and 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, the flow path of the natural wind will be further extended, and the time for the natural wind to flow around the phase-shifting transformer body 30 will be increased, and the natural wind entering the extension groove 5001 will be gathered in the gathering groove 5002 and reflux, further increasing the flow time of the natural wind around the phase-shifting transformer body 30.

[0037] The above is the working process of the entire device, and the contents not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

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

Claims

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

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

4. A three-body 220kV phase-shifting transformer according to claim 3, characterized in that: The flow extension component (50) comprises a flow extension groove (5001) and a flow focusing groove (5002); a plurality of flow extension grooves (5001) are provided in a linear array on the inclined surface of the guide block (4002); and a flow focusing groove (5002) is provided in the flow extension groove (5001).

5. A three-body 220kV phase-shifting transformer according to claim 4, characterized in that: The flow extension groove (5001) is an inclined structure, and the inclination direction of the flow extension groove (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 focusing groove (5002) is an arc-shaped structure, and the focusing groove (5002) is connected with the extension groove (5001).

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