Connecting structure of fan and box transformer substation

Abstract

The utility model relates to the technical field of wind power generation equipment, in particular to a connection structure of a fan and a box transformer substation, which comprises a tubular bus, two ends of the tubular bus are respectively connected with a converter in a fan tower drum and a low-voltage side of a boosting box transformer substation outside the fan tower drum, and the tubular bus comprises a plurality of sections of tubular bus groups. The two adjacent tubular bus groups are connected through copper flexible connection, and the tubular buses are fixed in a support mode or installed in a cable trench mode. The tubular busbar is better in heat dissipation performance and larger in span, the number of needed supporting points is smaller than that of a busbar, and arrangement is more convenient; every two adjacent tubular buses are connected through a copper flexible connector, so that the influence of the large bending radius of the cable on construction is effectively relieved, and operation and maintenance are more convenient. The tubular bus can be fixed in a support mode in a high-flood-level area, the tubular bus can be installed in a cable trench mode in a low-flood-level area, and the construction cost and difficulty are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation equipment, in particular to a connection structure between a wind turbine and a box transformer. Background Art

[0002] Most of the existing wind turbine transmission equipment uses copper core cables, which are expensive and need to be repaired and replaced as they age. The power of wind turbines is generally higher than 5MW, especially in large-scale projects where the power is as high as 10MW. The higher the power of the wind turbine, the more cables are needed to connect the wind turbine to the step-up transformer, and the material and labor costs increase accordingly.

[0003] The Chinese utility model patent with the authorization announcement number CN214196553U discloses a connection device between a wind turbine tower and a booster transformer and a wind power generation equipment. The utility model uses a connection device formed by connecting a busbar, a flexible connector and a wall bushing in sequence to connect the converter in the wind turbine tower and the booster transformer outside the wind turbine tower. By using a busbar, there is no need to wind a long and large number of cables from the bottom outside of the wind turbine foundation to the bottom surface, which reduces material loss and saves the operation and maintenance costs of the later equipment to a large extent. However, the single-channel current carrying capacity of the busbar is average, and the single current carrying capacity is less than half of the tubular busbar, and the busbar requires more support points. Utility Model Content

[0004] The purpose of the utility model is to address the defects of the prior art and provide a connection structure between a fan and a box transformer, which uses a small number of tubular busbars to connect the fan and the box transformer, reduces construction costs, and requires fewer support points.

[0005] In order to solve the above technical problems, the utility model provides a connection structure between a fan and a box transformer, which is characterized in that it includes a tubular busbar, the two ends of which are respectively connected to the converter in the fan tower and the low-voltage side of the booster box transformer outside the fan tower, the tubular busbar includes a plurality of tubular busbar groups, and two adjacent tubular busbar groups are connected by copper flexible connections, and the tubular busbar is fixed in the form of a bracket or installed in the form of a cable trench.

[0006] The utility model utilizes a tubular busbar to connect the fan and the booster box transformer. The phase spacing of the tubular busbar is larger than that of the busbar, so its heat dissipation will be better and the span will be larger. The tubular busbar requires fewer supporting points than the busbar, and its layout is more convenient. Copper soft connections are used to connect two adjacent tubular busbars, so that the tubular busbar can be bent 360°, effectively alleviating the impact of the large cable bending radius on construction, and operation and maintenance are more convenient. In addition, the tubular busbar can be installed according to the flood level in different regions. In high flood level areas, the tubular busbar can be fixed in the form of a bracket, and in low flood level areas, the tubular busbar can be installed in the form of a cable trench, which greatly reduces the construction cost and difficulty.

[0007] Furthermore, one end of the tubular busbar is connected to the converter in the wind turbine tower through a wire hole of the wind turbine tower, the middle part of the tubular busbar is supported by a bracket, and the height of the wire hole of the wind turbine tower and the height of the top of the bracket are both higher than the local highest historical flood level line.

[0008] For areas with high flood levels, the utility model adopts a bracket to support the tubular busbar. The height of the wire hole of the wind turbine tower and the height of the top of the bracket are both higher than the local historical highest flood level line, which can ensure the safety of the structure.

[0009] Furthermore, the bracket includes a support frame and a mounting plate, the bottom end of the support frame is fixed on the ground, the mounting plate is detachably mounted on the top of the support frame, a fixing hole is provided on the mounting plate, a wear-resistant sleeve is arranged in the fixing hole, and the tubular busbar is slidably arranged in the wear-resistant sleeve.

[0010] The utility model realizes the functions of radial support and axial sliding of the tubular busbar by arranging the wear-resistant sleeve.

[0011] Furthermore, the length of the wear-resistant sleeve is greater than the length of the fixing hole.

[0012] The length of the wear-resistant sleeve of the utility model is greater than the length of the fixing hole, thereby increasing the force-bearing area of ​​the wear-resistant sleeve and appropriately dispersing the radial force of the tubular busbar.

[0013] Furthermore, a shock-absorbing ring is arranged between the wear-resistant sleeve and the fixing hole.

[0014] The utility model can reduce the impact between the wear-resistant sleeve and the bracket by arranging a shock-absorbing ring between the wear-resistant sleeve and the fixing hole, thereby improving the reliability and design life of the safe operation of the tubular busbar; in addition, the shock-absorbing ring will not affect the axial free sliding of the tubular busbar.

[0015] Furthermore, the mounting plate includes a plurality of plate units, grooves are provided on the sides of the plate units, the grooves between two adjacent plate units correspond one to one to form fixing holes, and the plate units abut against the wear-resistant sleeves through the grooves to fix the wear-resistant sleeves.

[0016] The utility model clamps and fixes the wear-resistant sleeve by using a plurality of plate units, which is beneficial to improving installation efficiency.

[0017] Furthermore, fixed clamps are provided at both ends of the copper flexible connection, and the fixed clamps are fixedly connected to the insulating layer of the tubular busbar through fixings. Buffer pads are provided between the fixings and the insulating layer of the tubular busbar, and the buffer pads are used to prevent the fixed clamps from wearing and damaging the insulating layer.

[0018] The utility model is fixedly connected to the insulating layer of the tubular busbar by means of a fixed clamp block. Since the hardness of the fixed clamp block is higher than that of the busbar insulating layer, a buffer pad placed therein can effectively prevent the fixed clamp block from wearing and damaging the insulating layer.

[0019] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model can realize the connection of a small number of tubular busbars between the fan and the box-type transformer, and cleverly utilizes the high current-carrying capacity characteristics of the tubular busbar to greatly reduce the cost; copper soft connections are used to connect two adjacent tubular busbars, so that the tubular busbar can be bent 360°, effectively alleviating the impact of the large cable bending radius on construction, and making operation and maintenance more convenient; in addition, the tubular busbar can be installed according to the flood level in different regions. In high flood level areas, the tubular busbar can be fixed in the form of a bracket, and in low flood level areas, the tubular busbar can be installed in the form of a cable trench, which greatly reduces the construction cost and difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the copper flexible connection of the utility model;

[0022] Figure 3 It is a structural schematic diagram of the bracket of the utility model.

[0023] Figure numerals: tubular busbar 1; wind turbine tower 2; booster box transformer 3; bracket 4; copper flexible connection 5; wire hole of wind turbine tower 6; support frame 7; mounting plate 8; wear-resistant sleeve 9; shock-absorbing ring 10; fixing clamp block 11; buffer pad 12. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] like Figure 1As shown, this embodiment is described by taking a high flood level area as an example. This embodiment provides a connection structure between a fan and a box transformer, including a tubular busbar 1 and a bracket 4. One end of the tubular busbar 1 is connected to the converter in the fan tower 2 through a fan tower cable hole 6. The middle of the tubular busbar 1 is supported by the bracket 4. The other end of the tubular busbar 1 is connected to the low-pressure side of the booster box transformer 3 outside the fan tower 2. The height of the fan tower cable hole 6 and the height of the top of the bracket 4 are both higher than the highest local historical flood level to ensure the safety of the structure.

[0026] like Figure 2 As shown, the tubular busbar 1 includes a group of multiple tubular busbars 1, and two adjacent groups of tubular busbars 1 are connected by a copper flexible connection 5. Fixed clamps 11 are arranged at both ends of the copper flexible connection 5. The fixed clamps 11 are clamped and fixed to the insulating layer of the tubular busbar 1 through a fixing member. A buffer pad 12 is arranged between the fixing member and the insulating layer of the tubular busbar 1. The buffer pad 12 is used to prevent the fixed clamps 11 from wearing and damaging the insulating layer. In this embodiment, the fixing member is a bolt.

[0027] like Figure 3 As shown, the bracket 4 includes a support frame 7 and a mounting plate 8, and the support frame 7 includes a support rod and a support plate. Figure 3 The support rod is not shown in the figure, the bottom end of the support rod is fixed on the ground, the support plate is welded to the top end of the support rod, and the mounting plate 8 is detachably mounted on the support plate by bolts.

[0028] The mounting plate 8 includes a plurality of plate units, and grooves are provided on the sides of the plate units. The grooves between two adjacent plate units correspond to each other to form a fixing hole, and a wear-resistant sleeve 9 is arranged in the fixing hole. The plate unit abuts against the wear-resistant sleeve 9 through the groove to fix the wear-resistant sleeve 9. The tubular busbar 1 is slidably arranged in the wear-resistant sleeve 9.

[0029] In this embodiment, the length of the wear-resistant sleeve 9 is greater than the length of the fixing hole, which increases the force-bearing area of ​​the wear-resistant sleeve 9 and can appropriately disperse the radial force of the tubular busbar 1 .

[0030] In this embodiment, a shock-absorbing ring 10 is arranged between the wear-resistant sleeve 9 and the fixing hole. The shock-absorbing ring 10 can reduce the impact between the wear-resistant sleeve 9 and the bracket 4, thereby improving the reliability and design life of the safe operation of the tubular busbar 1. In addition, since the shock-absorbing ring 10 is not directly arranged between the wear-resistant sleeve 9 and the tubular busbar 1, the influence of the shock-absorbing ring 10 on the axial free sliding of the tubular busbar 1 is avoided.

[0031] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A connection structure between a fan and a box transformer, characterized in that: The invention comprises a tubular busbar (1), the two ends of which are respectively connected to a converter in a wind turbine tower (2) and a low-voltage side of a booster transformer (3) outside the wind turbine tower (2); the tubular busbar (1) comprises a plurality of tubular busbar (1) groups, two adjacent tubular busbar (1) groups are connected by a copper flexible connection (5); the tubular busbar (1) is fixed in the form of a bracket (4) or installed in the form of a cable trench.

2. The connection structure between the fan and the box transformer according to claim 1 is characterized in that: One end of the tubular busbar (1) is connected to the converter in the wind turbine tower (2) through a wind turbine tower wire hole (6), the middle of the tubular busbar (1) is supported by a bracket (4), and the height of the wind turbine tower wire hole (6) and the height of the top of the bracket (4) are both higher than the highest local flood level in history.

3. The connection structure between the fan and the box transformer according to claim 2 is characterized in that: The bracket (4) comprises a support frame (7) and a mounting plate (8), the bottom end of the support frame (7) is fixed on the ground, the mounting plate (8) is detachably mounted on the top of the support frame (7), a fixing hole is provided on the mounting plate (8), a wear-resistant sleeve (9) is arranged in the fixing hole, and the tubular busbar (1) is slidably arranged in the wear-resistant sleeve (9).

4. The connection structure between the fan and the box transformer according to claim 3 is characterized in that: The length of the wear-resistant sleeve (9) is greater than the length of the fixing hole.

5. The connection structure between the fan and the box transformer according to claim 3 is characterized in that: A shock absorbing ring (10) is arranged between the wear-resistant sleeve (9) and the fixing hole.

6. The connection structure between the fan and the box transformer according to claim 3 is characterized in that: The mounting plate (8) comprises a plurality of plate units, grooves are provided on the sides of the plate units, the grooves between two adjacent plate units correspond one to one to form fixing holes, and the plate units abut against the wear-resistant sleeve (9) through the grooves to fix the wear-resistant sleeve (9).

7. The connection structure between the fan and the box transformer according to any one of claims 1 to 6, characterized in that: Fixed clamps (11) are arranged at both ends of the copper flexible connection (5); the fixed clamps (11) are fixedly connected to the insulating layer of the tubular busbar (1) via a fixing piece; a buffer pad (12) is arranged between the fixing piece and the insulating layer of the tubular busbar (1); the buffer pad (12) is used to prevent the fixed clamps (11) from wearing and damaging the insulating layer.

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