Box transformer substation structure shaped like Chinese character'mu '

Abstract

The utility model discloses a box transformer structure shaped like a Chinese character'mu ', which comprises a low-voltage chamber, a transformer and a high-voltage chamber, the transformer is arranged between the low-voltage chamber and the high-voltage chamber, a low-voltage conducting rod is fixed at the connection position of the transformer and the low-voltage chamber, and the low-voltage conducting rod is positioned in the middle or middle-upper part of the low-voltage chamber in the height direction and in the middle of the low-voltage chamber in the length direction. A low-voltage cabinet is arranged in the low-voltage chamber, a main circuit breaker is fixed in the low-voltage cabinet, the main circuit breaker is located in the middle of the low-voltage chamber in the length direction, the height of the main circuit breaker is close to that of the low-voltage conducting rod, the main circuit breaker can be aligned with the low-voltage conducting rod, and under the position structure, a main transverse copper bar below the main circuit breaker is divided towards two sides, so that the manufacturing cost is reduced; and the operation loss of the product is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated transformer substations, in particular to a U-shaped box transformer structure. Background Art

[0002] Box transformers are also called prefabricated substations or combined transformers. In string photovoltaic power generation systems, many small inverters need to be connected to the same box-type substation, and each small inverter must be equipped with a molded case switch in the low-voltage cabinet of the box-type substation. The molded case switch is used to control these currents, which are then collected on the main copper busbar. The current of the main copper busbar is then connected to the main circuit breaker, and then transmitted to the transformer. After the transformer boosts the voltage, it is sent to the high-voltage room and finally transmitted to the power grid.

[0003] At present, the commonly used box-type transformers are in a herringbone structure, that is, the high-voltage cabinet and the low-voltage cabinet are located on the same side of the transformer, such as Figure 1 As shown, during installation, the main circuit breaker should be close to the low-voltage conductive rod, and the main circuit breaker cannot be directly opposite the low-voltage conductive rod. Due to the limitation of the installation position of the low-voltage cabinet, the main circuit breaker can only be installed on the side of the low-voltage cabinet close to the transformer. Then the main circuit breaker is basically located at one end of the main copper busbar, so the required copper busbar cross-sectional area is larger. Utility Model Content

[0004] In view of the defects of the above-mentioned prior art, the purpose of the utility model is to provide a U-shaped box transformer structure, reduce the amount of copper busbars used, and reduce the operating loss of the box transformer.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] A U-shaped box transformer structure comprises a low-voltage chamber, a transformer and a high-voltage chamber, wherein the transformer is arranged between the low-voltage chamber and the high-voltage chamber, a low-voltage conductive rod is fixed at the connection position between the transformer and the low-voltage chamber, and the low-voltage conductive rod is located in the middle section of the length direction of the low-voltage chamber, a low-voltage cabinet is arranged in the low-voltage chamber, a main circuit breaker is fixed in the low-voltage cabinet, and the main circuit breaker is located in the middle section of the length direction of the low-voltage chamber.

[0007] Furthermore, the low-voltage conductive rod is located in the middle or upper middle part of the low-voltage chamber in the height direction, and the main circuit breaker is located in the middle or upper middle part of the low-voltage chamber in the height direction.

[0008] Furthermore, a main copper bar and a plurality of molded case switches are fixed in the low-voltage cabinet, the main copper bar is arranged below the main circuit breaker, and the molded case switches are arranged below the main copper bar.

[0009] Furthermore, the plurality of molded case switches are electrically connected to the main copper busbar, the main copper busbar is electrically connected to the main circuit breaker, and the main circuit breaker is electrically connected to the low-voltage conductive rod.

[0010] Furthermore, the main copper busbar is arranged along the length direction of the low-voltage cabinet.

[0011] Furthermore, an operating channel is provided in the low-pressure chamber.

[0012] Furthermore, there are multiple low-voltage conductive rods, and the heights of the multiple low-voltage conductive rods are the same.

[0013] The beneficial effects of the utility model are:

[0014] The transformer is set in the middle position, and the low-voltage chamber and the high-voltage chamber are respectively set on both sides of the transformer, so that the main circuit breaker can be basically aligned with the low-voltage conductive rod. Under this position structure, the connection distance between the two is short; the main circuit breaker is located in the middle of the main copper bar, and the main copper bar extends to both sides of the main circuit breaker. The cross-sectional area of ​​the main copper bar can be reduced to about 50% to 65% of the cross-sectional area of ​​the full-current copper bar, which not only reduces the amount of copper bar used, but also reduces the loss during the operation of the box transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of the structure of a box-type transformer in the prior art;

[0016] Figure 2 It is a position relationship diagram of the main circuit breaker in the prior art;

[0017] Figure 3 This is the front view of the U-shaped box-type transformer structure of the utility model;

[0018] Figure 4 It is a top view of the U-shaped box-type transformer structure of the utility model;

[0019] Figure 5 It is a position relationship diagram of the main circuit breaker in the U-shaped box-type transformer structure of the utility model.

[0020] In the figure: 1. Low-voltage room; 2. Transformer; 3. High-voltage room; 4. Low-voltage conductive rod; 5. Main circuit breaker; 6. Main copper busbar; 7. Molded case switch; 8. Operation channel; 9. Low-voltage cabinet. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clearly understood, the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 3 and Figure 4As shown in the figure, the present utility model provides a box-type substation structure in the shape of a Chinese character "mu", which includes a low-voltage chamber 1, a transformer 2, and a high-voltage chamber 3. The transformer 2 is fixedly arranged between the low-voltage chamber 1 and the high-voltage chamber 3. A low-voltage conductive bar 4 is fixed at the connection position between the transformer 2 and the low-voltage chamber 1. The low-voltage conductive bar 4 is located in the middle or upper-middle part of the low-voltage chamber 1 in the height direction and is located at or near the middle section of the low-voltage chamber 1 in the length direction. A low-voltage switchgear 9 is arranged in the low-voltage chamber 1. A main circuit breaker 5 is fixed in the low-voltage switchgear 9. The main circuit breaker 5 is located at or near the middle section of the low-voltage chamber 1 in the length direction and its height is the same as or close to the height of the low-voltage conductive bar 4. The main circuit breaker 5 faces the low-voltage conductive bar 4.

[0023] Different from the existing box-type substation in the shape of a Chinese character "pin", in the box-type substation structure in the shape of a Chinese character "mu", the transformer 2 is arranged in the middle position, and the low-voltage chamber 1 and the high-voltage chamber 3 are respectively arranged on both sides of the transformer 2. After the low-voltage chamber 1, the transformer 2, and the high-voltage chamber 3 are assembled, it is similar to a Chinese character "mu".

[0024] The low-voltage conductive bar 4 is installed in the middle or upper-middle part of the low-voltage chamber 1 in the height direction. The current between the low-voltage chamber 1 and the transformer 2 is conducted through the low-voltage conductive bar 4. The low-voltage conductive bar 4 is located in the middle section of the low-voltage chamber 1 in the length direction. At the same time, the main circuit breaker 5 is located in the middle section of the low-voltage chamber 1 in the length direction and in the middle or upper-middle part of the low-voltage chamber 1 in the height direction, and its height is the same as or close to the height of the low-voltage conductive bar 4. In this way, the main circuit breaker 5 can be basically aligned with the low-voltage conductive bar 4. In this positional relationship, the straight-line distance from the main circuit breaker 5 to the low-voltage conductive bar 4 is short. The main copper busbar 6 under the main circuit breaker 5 branches out to both sides, which is beneficial to reducing the manufacturing cost and reducing the operation loss of the product.

[0025] Reference Figure 4 , the main circuit breaker 5 is arranged in the middle of the low-voltage chamber 1 in the length direction. That is to say, the main circuit breaker 5 is basically also located in the middle of the low-voltage switchgear 9 in the length direction. In this way, the main circuit breaker 5 will not be like Figure 1 and Figure 2 shown, only located at one end of the main copper busbar 6, but located in the middle of the main copper busbar 6, as Figure 5 shown, effectively reducing the amount of copper busbar used.

[0026] Furthermore, a main copper busbar 6 and a plurality of molded case switches 7 are fixed in the low-voltage switchgear 9. The main copper busbar 6 is arranged below the main circuit breaker 5, and the molded case switches 7 are arranged below the main copper busbar 6.

[0027] As Figure 2 shown in the box-type substation structure in the shape of a Chinese character "pin", the main circuit breaker 5 is located at one end of the main copper busbar 6, and the cross-sectional area of the copper busbar cannot be reduced. However, Figure 5 shown in the box-type substation structure in the shape of a Chinese character "mu", the main circuit breaker 5 is located in the middle of the main copper busbar 6. The molded case switches 7 below the main circuit breaker 5 are arranged on both sides of the main circuit breaker 5. In this way, the main copper busbar 6 extends to both sides of the main circuit breaker 5, different from Figure 2The cross-sectional area of ​​the main copper bar 6 can be reduced to about 50% to 65% of the cross-sectional area of ​​the full current copper bar, which not only reduces the amount of copper bar used, but also reduces the loss during the operation of the box-type transformer.

[0028] Furthermore, a plurality of molded case switches 7 are electrically connected to the main copper busbar 6 , the main copper busbar 6 is electrically connected to the main circuit breaker 5 , and the main circuit breaker 5 is electrically connected to the low-voltage conductive rod 4 .

[0029] Furthermore, a plurality of molded case switches 7 are fixed on the inner wall of the low voltage cabinet 9 .

[0030] Furthermore, the main copper busbar 6 is arranged along the length direction of the low-voltage cabinet 9 .

[0031] Furthermore, an operating channel 8 is provided in the low-voltage chamber 1 , and the operating channel 8 is provided on the side of the low-voltage cabinet 9 .

[0032] Furthermore, there are multiple low-voltage conductive rods 4, and the heights of the multiple low-voltage conductive rods 4 are the same.

[0033] The U-shaped box transformer structure is not limited to use in photovoltaic power generation systems, but can be used in other power supply systems as long as the low-voltage cabinet 9 is equipped with multiple molded case switches 7.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims

1. A U-shaped box-type transformer structure, characterized in that: The invention comprises a low-voltage chamber (1), a transformer (2) and a high-voltage chamber (3), wherein the transformer (2) is arranged between the low-voltage chamber (1) and the high-voltage chamber (3), a low-voltage conductive rod (4) is fixed at the connection position between the transformer (2) and the low-voltage chamber (1), and the low-voltage conductive rod (4) is located in the middle section of the length direction of the low-voltage chamber (1), a low-voltage cabinet (9) is arranged in the low-voltage chamber (1), a main circuit breaker (5) is fixed in the low-voltage cabinet (9), and the main circuit breaker (5) is located in the middle section of the length direction of the low-voltage chamber (1).

2. The U-shaped box-type transformer structure according to claim 1 is characterized in that: The low-voltage conductive rod (4) is located in the middle or upper middle part of the low-voltage chamber (1) in the height direction, and the main circuit breaker (5) is located in the middle or upper middle part of the low-voltage chamber (1) in the height direction.

3. The U-shaped box-type transformer structure according to claim 1 is characterized in that: A main copper bar (6) and a plurality of molded case switches (7) are fixed in the low-voltage cabinet (9); the main copper bar (6) is arranged below the main circuit breaker (5); and the molded case switches (7) are arranged below the main copper bar (6).

4. The U-shaped box-type transformer structure according to claim 3 is characterized in that: The plurality of molded case switches (7) are electrically connected to the main copper busbar (6), the main copper busbar (6) is electrically connected to the main circuit breaker (5), and the main circuit breaker (5) is electrically connected to the low-voltage conductive rod (4).

5. The U-shaped box-type transformer structure according to claim 3 is characterized in that: The main copper busbar (6) is arranged along the length direction of the low-voltage cabinet (9).

6. The U-shaped box-type transformer structure according to claim 1 is characterized in that: An operating channel (8) is provided in the low-pressure chamber (1).

7. The U-shaped box-type transformer structure according to claim 1 is characterized in that: There are a plurality of low-voltage conductive rods (4), and the heights of the plurality of low-voltage conductive rods (4) are the same.

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