Photovoltaic box transformer substation

Abstract

The utility model discloses a photovoltaic box transformer, and relates to the technical field of photovoltaic power generation, the photovoltaic box transformer comprises a high-voltage chamber, a low-voltage chamber, a transformer, a combined electric appliance, a low-voltage cabinet and a low-voltage unit, the high-voltage chamber and the low-voltage chamber are arranged on two adjacent sides of the transformer, and one side, facing the transformer, of the low-voltage chamber is a connection side; a support frame is arranged in the low-voltage cabinet; the low-voltage unit is accommodated in the low-voltage chamber, the low-voltage unit comprises a frame circuit breaker arranged in the low-voltage cabinet, the frame circuit breaker is provided with an upper wiring terminal and a lower wiring terminal, the frame circuit breaker is arranged at the top of the supporting frame, and the connecting side and the position, corresponding to the lower wiring terminal, of the low-voltage cabinet are each provided with a wire passing hole for a soft copper bar to penetrate through. The height of the lower wiring terminal is consistent with the height of a low-voltage sleeve of the transformer, and the low-voltage sleeve is connected with the lower wiring terminal through a soft copper bar. According to the photovoltaic box transformer substation provided by the utility model, the soft copper bar for connecting the lower wiring terminal and the low-voltage sleeve can be close to a straight line, so that the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation technical field, especially photovoltaic box transformer. BACKGROUND

[0002] With the global attention to clean energy and the transformation of energy structure, the photovoltaic power generation market demand continues to grow. The existing photovoltaic box transformer usually adopts the arrangement of product or L type, high voltage adopts integrated combination switch, low voltage frame circuit breaker upper side connects transformer, lower side connects with the plastic shell circuit breaker connected with inverter, because photovoltaic capacity is generally 3600KVA and below, transformer oil tank is short, internal arrangement is unreasonable and leads to the distance of low voltage bushing and frame circuit breaker upper mouth is big, needs to do lower copper bar, and because copper bar needs insulation space, leads to the area of low voltage chamber increases, cost is higher. SUMMARY

[0003] The utility model discloses a photovoltaic box transformer, which aims to solve the technical problem of high cost of the existing photovoltaic box transformer.

[0004] To achieve the above-mentioned purpose, the utility model provides a photovoltaic box transformer, which comprises:

[0005] A high-voltage chamber, a low-voltage chamber and a transformer, the high-voltage chamber and the low-voltage chamber are arranged on the adjacent two sides of the transformer, and the low-voltage bushing of the transformer faces the low-voltage chamber, and one side of the low-voltage chamber facing the transformer is a connecting side;

[0006] A combined electrical apparatus, which is accommodated in the high-voltage chamber, and is connected with the high-voltage bushing of the transformer;

[0007] A low-voltage cabinet, which is arranged in the low-voltage chamber, and is provided with a support frame inside;

[0008] A low-voltage unit, which is accommodated in the low-voltage chamber, and comprises a frame circuit breaker arranged in the low-voltage cabinet, the frame circuit breaker has an upper wiring terminal and a lower wiring terminal below the upper wiring terminal, the frame circuit breaker is arranged on the top of the support frame, the connecting side and the low-voltage cabinet are provided with wire holes for the soft copper bar to pass through at the positions corresponding to the lower wiring terminal, the height of the lower wiring terminal is consistent with that of the low-voltage bushing of the transformer, and the low-voltage bushing and the lower wiring terminal are connected through the soft copper bar.

[0009] In an embodiment, one side of the low-voltage cabinet facing the connecting side is a fitting side, and the connecting side and the fitting side are arranged in a fitting manner.

[0010] In an embodiment, the low-voltage cabinet is provided with a copper busbar, and the low-voltage unit further comprises a plurality of molded case circuit breakers, each of which is connected to the copper busbar, and the upper connection terminal is connected to the copper busbar.

[0011] The low-voltage cabinet has a first installation space and a second installation space arranged adjacently, the support frame and the frame circuit breaker are arranged in the first installation space, the molded case circuit breakers are arranged in the second installation space, the copper busbar spans the first installation space and the second installation space, the frame circuit breaker and the molded case circuit breakers are both located below the copper busbar, and the copper busbar is arranged close to the abutting side.

[0012] In an embodiment, the second installation space is vertically spaced to have two installation areas, each of which is installed with a plurality of molded case circuit breakers, the molded case circuit breakers in one of the installation areas are first molded case circuit breakers, the molded case circuit breakers in the other installation area are second molded case circuit breakers, the first molded case circuit breakers are located above the second molded case circuit breakers, and the first molded case circuit breakers and the second molded case circuit breakers are both horizontally spaced.

[0013] In an embodiment, the first molded case circuit breakers and the second molded case circuit breakers are vertically staggered, the first molded case circuit breakers are arranged close to the abutting side, and the second molded case circuit breakers are arranged close to the connecting side.

[0014] In an embodiment, there is a gap between two adjacent first molded case circuit breakers, and each second molded case circuit breaker is arranged corresponding to one of the gaps.

[0015] In an embodiment, the upper connection terminal of the frame circuit breaker is connected to the copper busbar through a turnover, and the low-voltage unit further comprises a low-voltage current transformer, which is arranged on the turnover.

[0016] In an embodiment, the turnover and the copper busbar are both covered with a transparent cover.

[0017] In an embodiment, the low-voltage unit further comprises an ups power supply and an auxiliary transformer, the ups power supply is arranged in the first installation space and below the support frame, and the auxiliary transformer is arranged outside the low-voltage cabinet and on a side of the first installation space away from the second installation space.

[0018] In an embodiment, the low-voltage chamber is provided with an air inlet on a side away from the transformer, and is provided with an air extractor for extracting gas in the low-voltage chamber outside the low-voltage chamber on a side away from the high-voltage chamber.

[0019] This utility model of photovoltaic box transformer, by setting a support frame in the low-voltage cabinet and placing the frame circuit breaker on the support frame, can effectively stabilize the frame circuit breaker. In addition, by placing the lower terminal of the frame circuit breaker at the same height as the low-voltage bushing of the transformer, the flexible copper busbar connecting the lower terminal and the low-voltage bushing can be nearly straight, thereby reducing the amount of flexible copper busbar used and eliminating the need for additional lower lead copper busbars, thus reducing costs and saving internal space in the low-voltage cabinet, resulting in a more reasonable layout. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A top view of an embodiment of the photovoltaic box transformer provided by this utility model;

[0022] Figure 2 A cross-sectional view of an embodiment of the photovoltaic box transformer provided by this utility model;

[0023] Figure 3 This is a front view of the low-voltage switchgear in one embodiment of the photovoltaic transformer provided by this utility model.

[0024] Explanation of icon numbers:

[0025] 100. Photovoltaic transformer substation; 1. High-voltage compartment; 11. Combined electrical appliances; 2. Low-voltage compartment; 21. Low-voltage cabinet; 211. Support frame; 212. Fitting side; 213. First installation space; 214. Second installation space; 22. Low-voltage unit; 221. Frame circuit breaker; 2211. Upper terminal block; 2212. Lower terminal block; 222. Busbar; 223. Molded case circuit breaker; 223a. First molded case circuit breaker; 223b. Second molded case circuit breaker; 224. Flip-up busbar; 225. Low-voltage current transformer; 226. UPS power supply; 227. Auxiliary transformer; 23. Connection side; 24. Soft copper busbar; 25. Exhaust fan; 26. Gap; 3. Transformer; 31. Low-voltage bushing.

[0026] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] 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 scope of protection of the present utility model.

[0028] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0029] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] With the global emphasis on clean energy and the transformation of the energy structure, the market demand for photovoltaic power generation continues to grow. Existing photovoltaic transformer substations typically adopt a triangular or L-shaped layout. The high voltage uses an integrated combination switch, and the low voltage frame circuit breaker is connected to the transformer on the upper side and to the inverter via a molded case circuit breaker 223 on the lower side. Because the photovoltaic capacity is generally 3600KVA and below, the transformer tank is short, and the internal layout is unreasonable, resulting in a large distance between the low voltage bushing and the upper opening of the frame circuit breaker. This requires the installation of a lower copper busbar, and because the copper busbar requires insulation space, the area of ​​the low voltage compartment increases, leading to higher costs.

[0031] This utility model proposes a photovoltaic box transformer 100.

[0032] Please see Figures 1 to 3In one embodiment of this utility model, the photovoltaic transformer substation 100 includes a high-voltage chamber 1, a low-voltage chamber 2, a transformer 3, a combined electrical appliance 11, a low-voltage cabinet 21, and a low-voltage unit 22. The high-voltage chamber 1 and the low-voltage chamber 2 are located on adjacent sides of the transformer 3, with the low-voltage bushing 31 of the transformer 3 facing the low-voltage chamber 2, and the side of the low-voltage chamber 2 facing the transformer 3 being the connection side 23. The combined electrical appliance 11 is housed in the high-voltage chamber 1 and is connected to the high-voltage bushing of the transformer 3. The low-voltage cabinet 21 is located in the low-voltage chamber 2, and a support frame 211 is provided inside the low-voltage cabinet 21. The low-voltage unit 22 is housed in the low-voltage chamber 1. Inside room 2, the low-voltage unit 22 includes a frame circuit breaker 221 installed in the low-voltage cabinet 21. The frame circuit breaker 221 has an upper terminal 2211 and a lower terminal 2212 located below the upper terminal 2211. The frame circuit breaker 221 is installed on the top of the support frame 211. The connection side 23 and the low-voltage cabinet 21 are provided with wire passage holes for the soft copper busbar 24 to pass through at the position corresponding to the lower terminal 2212. The lower terminal 2212 is at the same height as the low-voltage bushing 31 of the transformer 3, and the low-voltage bushing 31 and the lower terminal 2212 are connected by the soft copper busbar 24.

[0033] The photovoltaic box transformer 100 of this utility model can stabilize the frame circuit breaker 221 by setting a support frame 211 in the low-voltage cabinet 21 and placing the frame circuit breaker 221 on the support frame 211. In addition, by placing the lower terminal 2212 of the frame circuit breaker 221 at the same height as the low-voltage bushing 31 of the transformer 3, the soft copper busbar 24 connecting the lower terminal 2212 and the low-voltage bushing 31 can be close to a straight line, thereby reducing the amount of soft copper busbar 24 used and eliminating the need for additional lower lead copper busbars, reducing costs and saving internal space in the low-voltage cabinet 21, and making the layout more reasonable.

[0034] It should be noted that, in Figure 1 From the top view, the high-voltage panel and low-voltage panel of transformer 3 are arranged in an L-shape on adjacent sides of transformer 3. The high-voltage panel is connected to the high-voltage chamber 1, and the low-voltage panel is connected to the low-voltage chamber 2. At the same time, it can also be seen that transformer 3 and low-voltage chamber 2 are located on the same side of high-voltage chamber 1.

[0035] Specifically, transformer 3 adopts the oil-immersed transformer of the prior art. The heat sink of transformer 3 is exposed and located on the side away from low-voltage chamber 2, which is conducive to heat dissipation of transformer 3 and does not affect low-voltage chamber 2.

[0036] In this embodiment, the combined electrical appliance 11 includes a high-voltage vacuum circuit breaker, a grounding switch, and a disconnecting switch combined into one appliance. In addition, the combined electrical appliance 11 also includes a high-voltage current transformer, a high-voltage surge arrester, and a high-voltage current transformer as described in the prior art, which will not be elaborated here.

[0037] In one embodiment, the side of the low-voltage switchgear 21 facing the connection side 23 is the mating side 212, and the connection side 23 is mated to the mating side 212. By mating the mating side 212 and the connection side 23, the distance between the low-voltage switchgear 21 and the connection side 23 is reduced, making the low-voltage switchgear 21 closer to the transformer 3, further reducing the amount of soft copper busbar 24 used and saving costs.

[0038] In one embodiment, a busbar 222 is provided inside the low-voltage switchgear 21, and the low-voltage unit 22 also includes multiple molded case circuit breakers 223. The multiple molded case circuit breakers 223 are all connected to the busbar 222, and the upper terminal block 2211 is connected to the busbar 222. The low-voltage switchgear 21 has a first installation space 213 and a second installation space 214 arranged adjacent to each other. The support frame 211 and the frame circuit breaker 221 are arranged in the first installation space 213, and the molded case circuit breaker 223 are arranged in the second installation space 214. The busbar 222 spans the first installation space 213 and the second installation space 214. The frame circuit breaker 221 and the molded case circuit breaker 223 are both located below the busbar 222, and the busbar 222 is arranged close to the mating side 212.

[0039] Understandably, the low-voltage switchgear 21 is divided into a first installation space 213 and a second installation space 214, which are arranged adjacently. The frame circuit breaker 221 and the molded case circuit breaker 223 are respectively installed in the first installation space 213 and the second installation space 214. The structural arrangement is reasonable and avoids mutual interference. In addition, the busbar 222 is set above the frame circuit breaker 221 and the molded case circuit breaker 223 to improve the convenience of installing cables or busbars. It also facilitates the connection of the upper terminals 2211 of the busbar 222 and the molded case circuit breaker 223, making the arrangement more reasonable.

[0040] Specifically, the busbar 222 is set horizontally in a straight line to reduce the amount used and save costs.

[0041] In one embodiment, two installation areas are arranged vertically at intervals within the second installation space 214. Multiple molded case circuit breakers 223 are installed in each of the two installation areas. The molded case circuit breaker 223 located in one installation area is a first molded case circuit breaker 223a, and the molded case circuit breaker 223 located in the other installation area is a second molded case circuit breaker 223b. The first molded case circuit breaker 223a is located above the second molded case circuit breaker 223b. The multiple first molded case circuit breakers 223a and the multiple second molded case circuit breakers 223b are distributed horizontally at intervals.

[0042] Understandably, the second installation space 214 is provided with two installation areas, each of which is provided with multiple molded case circuit breakers 223. The multiple molded case circuit breakers 223 corresponding to each installation area are distributed at intervals along the horizontal direction, which can be regarded as two rows of molded case circuit breakers 223, so as to make reasonable use of the second installation space 214 and make the component arrangement inside the low voltage cabinet 21 more compact and reasonable.

[0043] In one embodiment, the first molded case circuit breaker 223a and the second molded case circuit breaker 223b are vertically staggered, wherein the first molded case circuit breaker 223a is disposed near the mating side 212 and the second molded case circuit breaker 223b is disposed near the connecting side 23.

[0044] Understandably, the first molded case circuit breaker 223a and the second molded case circuit breaker 223b are vertically staggered to... Figure 3 Taking a certain perspective as an example, the first molded case circuit breaker 223a in the upper row is positioned forward, and the second molded case circuit breaker 223b in the lower row is positioned backward. Furthermore, there is a gap between the first molded case circuit breaker 223a and the second molded case circuit breaker 223b, which facilitates the splicing of edge cables.

[0045] Specifically, in one embodiment, the distance between the first molded case circuit breaker 223a and the second molded case circuit breaker 223b is greater than or equal to 150mm. The upper row of first molded case circuit breakers 223a are all connected to the busbar using copper busbars, while the lower row of second molded case circuit breakers 223b are connected to the busbar using YJV cables.

[0046] In one embodiment, there is a gap 26 between two adjacent first molded case circuit breakers 223a, and each second molded case circuit breaker 223b is respectively provided corresponding to one of the gaps 26.

[0047] Understandably, such as Figure 3 As shown, the second molded case circuit breaker 223b in the lower row is set in the gap 26 between two adjacent first molded case circuit breakers 223a in the upper row, so that the YJV cable connecting the second molded case circuit breaker 223b and the busbar 222 can pass through the gap 26. At most one first molded case circuit breaker 223a can be set in each gap 26. The number of first molded case circuit breakers 223a and second molded case circuit breakers 223b can be adjusted according to actual needs.

[0048] Specifically, in one embodiment, the spacing between two adjacent molded case circuit breakers 223 in each installation area is greater than or equal to 70 mm to provide sufficient insulation space for easy cable arrangement.

[0049] In one embodiment, the upper terminal 2211 of the frame circuit breaker 221 is connected to the busbar 222 via a flip-up bar 224. The low-voltage unit 22 also includes a low-voltage current transformer 225, which is mounted on the flip-up bar 224. The structure is reasonably arranged, and the internal space of the low-voltage cabinet 21 is rationally planned. The upper terminal 2211 is located near the top of the frame circuit breaker 221, which reduces the difficulty of arranging the flip-up bar 224, reduces the number of flip-up bars used, and saves costs.

[0050] In one embodiment, both the flip-up busbar 224 and the busbar 222 are covered with transparent covers. These transparent covers provide protection and ensure the safety of personnel; the transparent covers can be made of PC board.

[0051] In one embodiment, the low-voltage unit 22 further includes a UPS power supply 226 and an auxiliary transformer 227. The UPS power supply 226 is disposed within the first installation space 213 and located below the support frame 211. The auxiliary transformer 227 is disposed outside the low-voltage cabinet 21 and located on the side of the first installation space 213 away from the second installation space 214.

[0052] Understandably, by placing the UPS power supply 226 below the support frame 211, the space below the support frame 211 is utilized in a reasonable manner, reducing the additional space occupied by the low-voltage room 2, thereby facilitating the reduction of the area / volume of the low-voltage room 2 and making the layout plan reasonable. The auxiliary transformer 227 is placed outside the low-voltage cabinet 21 to avoid the auxiliary transformer 227 interfering with the operation of the internal components of the low-voltage cabinet 21.

[0053] In one embodiment, an air inlet is provided on the side of the low-pressure chamber 2 away from the transformer 3, and an exhaust fan 25 is provided on the side of the low-pressure chamber 2 away from the high-pressure chamber 1 to draw the gas in the low-pressure chamber 2 out of the low-pressure chamber 2.

[0054] Understandably, by providing an air inlet to the low-pressure chamber 2 and an exhaust fan 25 on one side of the low-pressure chamber 2, the gas in the low-pressure chamber 2 can be circulated, heat dissipation can be achieved, and the temperature balance in the low-pressure chamber 2 can be ensured.

[0055] Specifically, the low-voltage cabinet 21 is also provided with ventilation openings. When the exhaust fan 25 exhausts air, some of the gas passes through the low-voltage cabinet 21 and can carry away the temperature generated by the low-voltage unit 22 in the low-voltage cabinet 21 during operation, thereby achieving cooling and ensuring that the low-voltage unit 22 in the low-voltage cabinet 21 operates normally and has good reliability.

[0056] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A photovoltaic transformer substation, characterized in that, include: The transformer includes a high-voltage chamber, a low-voltage chamber, and a transformer. The high-voltage chamber and the low-voltage chamber are located on adjacent sides of the transformer, and the low-voltage bushing of the transformer faces the low-voltage chamber. The side of the low-voltage chamber facing the transformer is the connection side. A combined electrical appliance, which is housed in the high-voltage chamber and connected to the high-voltage bushing of the transformer; A low-voltage switchgear is installed in the low-voltage chamber, and a support frame is installed inside the low-voltage switchgear. A low-voltage unit is housed within the low-voltage chamber. The low-voltage unit includes a frame circuit breaker disposed within the low-voltage cabinet. The frame circuit breaker has an upper terminal and a lower terminal located below the upper terminal. The frame circuit breaker is disposed on the top of the support frame. The connection side and the low-voltage cabinet at the position corresponding to the lower terminal are provided with through holes for flexible copper busbars to pass through. The lower terminal is at the same height as the low-voltage bushing of the transformer, and the low-voltage bushing is connected to the lower terminal via the flexible copper busbar.

2. The photovoltaic transformer substation as described in claim 1, characterized in that, The side of the low-voltage cabinet facing the connecting side is the fitting side, and the connecting side is fitted to the fitting side.

3. The photovoltaic transformer substation as described in claim 2, characterized in that, The low-voltage cabinet is equipped with a busbar, and the low-voltage unit also includes multiple molded case circuit breakers. All of the multiple molded case circuit breakers are connected to the busbar, and the upper terminal is connected to the busbar. The low-voltage switchgear has a first installation space and a second installation space arranged adjacent to each other. The support frame and the frame circuit breaker are arranged in the first installation space, and the molded case circuit breaker is arranged in the second installation space. The busbar spans the first installation space and the second installation space. The frame circuit breaker and the molded case circuit breaker are both located below the busbar, and the busbar is arranged close to the mating side.

4. The photovoltaic transformer substation as described in claim 3, characterized in that, The second installation space has two installation areas arranged vertically at intervals. Each of the two installation areas is equipped with a plurality of molded case circuit breakers. The molded case circuit breaker located in one of the installation areas is a first molded case circuit breaker, and the molded case circuit breaker located in the other installation area is a second molded case circuit breaker. The first molded case circuit breaker is located above the second molded case circuit breaker. The plurality of first molded case circuit breakers and the plurality of second molded case circuit breakers are distributed at intervals in the horizontal direction.

5. The photovoltaic transformer substation as described in claim 4, characterized in that, The first molded case circuit breaker and the second molded case circuit breaker are vertically staggered, wherein the first molded case circuit breaker is located closer to the mating side, and the second molded case circuit breaker is located closer to the connecting side.

6. The photovoltaic transformer substation as described in claim 4, characterized in that, There is a gap between two adjacent first molded case circuit breakers, and each second molded case circuit breaker is provided corresponding to one of the gaps.

7. The photovoltaic transformer substation as described in claim 3, characterized in that, The upper terminal of the frame circuit breaker is connected to the busbar via a flip-up bar. The low-voltage unit also includes a low-voltage current transformer, which is mounted on the flip-up bar.

8. The photovoltaic transformer substation as described in claim 7, characterized in that, Both the flip-up bus and the busbar are covered with transparent covers.

9. The photovoltaic transformer substation as described in claim 3, characterized in that, The low-voltage unit also includes a UPS power supply and an auxiliary transformer. The UPS power supply is located within the first installation space and below the support frame. The auxiliary transformer is located outside the low-voltage cabinet and on the side of the first installation space away from the second installation space.

10. The photovoltaic transformer substation as described in any one of claims 1 to 9, characterized in that, An air inlet is provided on the side of the low-pressure chamber away from the transformer, and an exhaust fan is provided on the side of the low-pressure chamber away from the high-pressure chamber to draw the gas from the low-pressure chamber to the outside of the low-pressure chamber.

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