Substation applying double-branch bus arrangement structure

Abstract

The utility model discloses a transformer station applying a double-branch bus arrangement structure, comprising a transformer used for changing current and voltage in an electric power system; the switch cabinet is used for opening, closing, controlling and protecting electric equipment in a power system, and the switch cabinet comprises a first switch cabinet and a second switch cabinet; one end of the main bus is connected with the transformer; the double-branch bus comprises a first bus and a second bus, one end of the first bus is connected with the first switch cabinet, one end of the second bus is connected with the second switch cabinet, and the other end of the first bus and the other end of the second bus are respectively connected with the other end, far away from the transformer, of the main bus; a flexible connecting piece is arranged at the gathering position of the first bus and the second bus and used for compensating displacement and stress generated by vibration or heating of the first bus and the second bus. Normal work of the transformer substation can be ensured; and power supply reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric power engineering, and in particular relates to a transformer substation applying a double-branch busbar arrangement structure. Background Art

[0002] Busbars, as a crucial connection in power system distribution equipment, gather, distribute, and transmit electrical energy. Their performance directly impacts the stability and reliability of power system operation. Compared to traditional cable busbars, rectangular busbars, and enclosed busbars, fully insulated tubular busbars offer advantages such as high current carrying capacity, low skin effect, low temperature rise, high allowable stress, safety against electric shock, robustness against seismic shock, ease of installation, and maintenance-free operation. Their application is becoming increasingly widespread.

[0003] Fully insulated tubular busbars are current-carrying conductors made of copper or aluminum metal circular tubes with insulation, which is then protected by a grounded metal shield. Currently, common voltage levels range from 6 to 35 kV. In power systems, fully insulated tubular busbars are often used to connect the low-voltage outlet side of transformers to the main switchgear. In equipment management, they are often used as accessories for transformers or switchgear.

[0004] With the rapid development of power grid construction, the scale and capacity of main transformers in substations are getting larger and larger, and the rated current of the low-voltage incoming line side of the transformer is also increasing. In some projects, one main transformer incoming line cabinet cannot meet the rated current requirement of the low-voltage incoming line side of the transformer, and the power supply reliability of the single-circuit incoming line is low. When the mother tube or a low-voltage cabinet fails, the entire main transformer will not work, resulting in production stoppage or waste of resources.

[0005] In view of this, how to design a technology that can ensure the normal operation of the main transformer and improve the reliability of power supply is the technical problem to be solved by the present utility model. Utility Model Content

[0006] The utility model provides a transformer substation applying a double-branch busbar arrangement structure, which can ensure the normal operation of the transformer substation and improve the power supply reliability.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] The utility model provides a substation with a double-branch busbar arrangement structure, comprising:

[0009] Transformers, which are used to change the voltage of current in power systems;

[0010] A switch cabinet, which is used to open and close, control and protect electrical equipment in a power system, and the switch cabinet includes a first switch cabinet and a second switch cabinet;

[0011] a main busbar, one end of which is connected to the transformer;

[0012] A double-branch busbar includes a first busbar and a second busbar, one end of the first busbar is connected to the first switchgear, one end of the second busbar is connected to the second switchgear, the other end of the first busbar and the other end of the second busbar are respectively connected to the other end of the main busbar away from the transformer, and a soft connector is provided at the junction of the first busbar and the second busbar, which is used to compensate for the displacement and stress caused by vibration or heat generation of the first busbar and the second busbar.

[0013] In some embodiments of the present application, the first switch cabinet and the second switch cabinet are arranged opposite to each other.

[0014] In some embodiments of the present application, the first busbar is located below the second busbar.

[0015] In some embodiments of the present application, the soft connector has a connecting portion and a deformable portion arranged between the two connecting portions.

[0016] In some embodiments of the present application, creepage-increasing skirts are provided on the outer surfaces of the main busbar, the first busbar, and the second busbar, and the creepage-increasing skirts are used to increase the creepage distance of insulation.

[0017] In some embodiments of the present application, the substation further includes a busbar bracket, which is arranged between the transformer and the switch cabinet, and is used to support the main busbar, the first busbar, and the second busbar.

[0018] In some embodiments of the present application, a slide rail is slidably connected to the busbar bracket, and a fixing clamp is connected to the slide rail via a roller, and the fixing clamp is used to clamp the main busbar, the first busbar and the second busbar.

[0019] In some embodiments of the present application, the substation includes a prefabricated cabin, and the first switchgear and the second switchgear are located in the prefabricated cabin.

[0020] In some embodiments of the present application, an operation passage is provided between the first switch cabinet and the second switch cabinet, and the operation passage is used for personnel to enter to operate equipment.

[0021] In some embodiments of the present application, maintenance passages are respectively provided between the first switch cabinet and the inner wall of the prefabricated cabin, and between the second switch cabinet and the inner wall of the prefabricated cabin, and the maintenance passages are used for personnel to enter and perform equipment maintenance.

[0022] Compared with the existing technology, the advantages and positive effects of the utility model are: through the double-branch fully insulated tubular busbar and the main busbar connected to the low-voltage side of the same transformer, and the first busbar and the second busbar are connected to the first switch cabinet and the second switch cabinet respectively, the problem that a single switch cabinet cannot meet the rated current of the low-voltage incoming line side of the transformer is solved, and when the first busbar fails, the normal operation of the second busbar is not affected, thereby improving the power supply reliability; the solution has a simple structure and is easy to construct, which can reduce the construction difficulty and greatly save the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 A schematic diagram of a substation structure of an embodiment of the present utility model using a double-branch busbar arrangement structure;

[0025] Figure 2 for Figure 1 A top view of

[0026] Figure 3 This is a structural diagram of a flexible connector in an embodiment of a double-branch busbar arrangement structure of the present invention;

[0027] Figure 4 This is a structural diagram of the busbar bracket in an embodiment of the double-branch busbar arrangement structure of the present invention.

[0028] Description of reference numerals:

[0029] 100. Transformer;

[0030] 201, first switch cabinet; 202, second switch cabinet;

[0031] 300, main busbar; 301, flexible connector; 3011, connecting portion; 3012, deformable portion;

[0032] 401, first busbar; 402, second busbar;

[0033] 500, busbar bracket; 501, slide rail; 502, roller; 503, fixing fixture;

[0034] 600, prefabricated cabin; 601, operation channel; 602, maintenance channel;

[0035] 700. Add climbing skirt. DETAILED DESCRIPTION

[0036] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are 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 making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that in the description of this utility model, terms such as "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In this utility model, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0041] like Figures 1 to 4 As shown, the present application provides a substation using a double-branch busbar arrangement structure, including a transformer 100, a switch cabinet, a main busbar 300 and a double-branch busbar, which can improve the reliability of power supply while ensuring normal operation.

[0042] The transformer 100 is used to change the voltage of current in a power system.

[0043] The switch cabinet is used to open and close, control and protect electrical equipment in the power system. The switch cabinet includes a first switch cabinet 201 and a second switch cabinet 202. The two switch cabinets can solve the problem that a single switch cabinet cannot meet the rated current of the low-voltage incoming line side of the transformer 100.

[0044] One end of the main busbar 300 is connected to the transformer 100 , and the other end is connected to the junction of the double-branch busbars.

[0045] The double-branch busbar includes a first busbar 401 and a second busbar 402. One end of the first busbar 401 is connected to the first switchgear 201, and one end of the second busbar 402 is connected to the second switchgear 202. The other ends of the first busbar 401 and the second busbar 402 are respectively connected to the other end of the main busbar 300 away from the transformer 100. A flexible connector 301 is provided at the junction of the first busbar 401 and the second busbar 402. The main busbar 300, the first busbar 401, and the second busbar 402 mentioned in this embodiment are all tubular busbars. Because the tubular busbars are arranged in sections and spliced ​​on site, any two sections of the tubular busbars are connected by an intermediate joint, which can connect and protect the connection parts, prevent damage to the connection parts caused by the external environment (such as moisture, dust, and chemicals), and provide insulation to ensure the continuity and stability of current transmission.

[0046] Soft connectors 301 are also provided at the location where the main busbar 300 is connected to the transformer 100 , the location where the first busbar 401 is connected to the first switch cabinet 201 , and the location where the second busbar 402 is connected to the second switch cabinet 202 .

[0047] The flexible connector 301 has a connecting portion 3011 and a deformable portion 3012 disposed between the two connecting portions. Figure 3 As shown, the soft connector 301 is a rectangular piece with an arched protrusion in the middle, that is, the two ends of the soft connector 301 are connecting parts 3011, the connecting parts 3011 are used to achieve connection by welding, the arched protrusion in the middle is a deformable part 3012, the deformable part 3012 is used to limit the tubular bus, and the deformable part 3012 is adapted to the size of the first bus 401 and the second bus 402. The application of the soft connector 301 can better ensure the safety of the daily operation of the first bus 401, the second bus 402 and the main bus 300: First, the soft connector 301 has an adjusting function. Since the first bus 401 First, the second busbar 402 will generate heat during daily use, and the heat will cause slight deformation and mechanical displacement. At this time, the soft connector 301 can compensate for the thermal deformation of the tubular busbar; second, the soft connector 301 has a weakening effect. Since the substation equipment will generate vibration during use, the vibration will cause the tubular busbar to deform. At this time, the soft connector 301 can absorb part of the vibration, thereby reducing the influence of the equipment vibration on the deformation of the tubular busbar; third, the soft connector 301 has a protective effect. In the event of geological collapse or settlement, the soft connector 301 can strengthen the connection between the first busbar 401 and the second busbar 402.

[0048] The flexible connector 301 may be made of tinned copper, which has strong corrosion resistance and wear resistance, and can ensure the connection strength of the first busbar 401, the second busbar 402 and the main busbar 300 while not being easily worn.

[0049] like Figure 1 As shown, the first switch cabinet 201 and the second switch cabinet 202 are arranged opposite to each other. The relatively arranged first switch cabinet 201 and the second switch cabinet 202 have a low requirement for the distance between the front and the back of the cabinet, which can save the installation space required for the switch cabinet. In addition, the operation and maintenance personnel can see all the operation panels when standing between the first switch cabinet 201 and the second switch cabinet 202, which is convenient for the operation and maintenance personnel to operate.

[0050] like Figure 1 As shown, the first busbar 401 is arranged below the second busbar 402. Compared with arranging the first busbar 401 and the second busbar 402 horizontally or in other ways, arranging the first busbar 401 and the second busbar 402 up and down is the optimal solution for saving tubular busbars and other materials, which can effectively reduce the basic cost of the substation.

[0051] Creepage skirts 700 are provided on the outer surfaces of the main tubular busbar, the first tubular busbar and the second tubular busbar. The creepage skirts 700 are used to increase the creepage distance of insulation, improve the insulation strength and flashover voltage in dirty and wet conditions, and achieve anti-flashover effect.

[0052] The substation also includes several busbar brackets 500, which are arranged between the transformer 100 and the switchgear. The busbar brackets 500 can support the main busbar 300, the first busbar 401 and the second busbar 402 to prevent the longer sections of the main busbar 300, the first busbar 401 and the second busbar 402 from deforming under the action of gravity. The busbar brackets 500 are made of high-quality channel steel by welding and the surface is hot-dip galvanized and passivated, which has excellent corrosion resistance and ensures service life.

[0053] like Figure 4 As shown, the busbar bracket 500 supporting the first busbar 401 and the second busbar 402 is a double-layer structure, the upper layer is used to support the second busbar 402, and the lower layer is used to support the first busbar 401. The double-layer structure can reduce the number of busbar brackets 500 and reduce economic costs.

[0054] A slide rail 501 is slidably connected to the busbar bracket 500. Several fixing fixtures 503 are connected to the slide rail 501 via rollers 502. The number of fixing fixtures 503 is determined by the number of tubular busbars. Fixing fixtures 503 are circular fixtures formed by bolting two sets of semicircular hardware together. The size of the circular fixtures matches the size of the tubular busbars. The arrangement of fixing fixtures 503, slide rails 501, and rollers 502 can absorb changes in the length of the tubular busbar due to thermal expansion and contraction during operation and maintenance, ensuring stable operation. The tubular busbars are clamped and fixed with non-magnetic hardware and connected to the slide rails 501 via rollers 502. This effectively prevents operational accidents caused by closed magnetic circuits in a single tubular busbar, ensuring safe operation of the tubular busbars.

[0055] like Figure 1 or Figure 2 As shown, the substation includes a prefabricated cabin 600, and the first switch cabinet 201 and the second switch cabinet 202 are located in the prefabricated cabin 600. Compared with traditional substations, the prefabricated cabin 600 type substation has a short construction period, low cost and strong environmental adaptability. The above-mentioned double-branch busbar layout structure is suitable for the prefabricated cabin 600 type substation.

[0056] Holes (not shown in the figure) are reserved on the prefabricated cabin 600 to facilitate the passage of the first busbar 401 and the second busbar 402 into the first switch cabinet 201 and the second switch cabinet 202 for connection. After passing through the holes, the first busbar 401 and the second busbar 402 need to be sealed with non-magnetic materials, such as insulating epoxy resin plates or aluminum alloy plates, to enhance insulation and improve safety of use.

[0057] like Figure 1As shown, an operating channel 601 is provided between the first switch cabinet 201 and the second switch cabinet 202. The width of the operating channel 601 is not less than 2700 mm. Based on the operation requirements of the equipment, such as manual operation of the circuit breaker and pushing and pulling of the switch cabinet, the operating channel 601 ensures that the operation and maintenance personnel have sufficient space when performing operations and will not collide with adjacent equipment, thereby ensuring the smoothness and safety of the movement or maintenance operation process.

[0058] like Figure 1 As shown, maintenance passages 602 are provided between the first switch cabinet 201 and the inner wall of the prefabricated cabin 600, and between the second switch cabinet 202 and the inner wall of the prefabricated cabin 600. The width of the maintenance passage 602 is not less than 800 mm. Since the first switch cabinet 201 and the second switch cabinet 202 are arranged relative to each other, operation and maintenance personnel need to regularly enter the rear of the equipment for daily maintenance, cleaning or fault inspection. The setting of the maintenance passage 602 facilitates smooth entry for operation and maintenance personnel.

[0059] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A substation using a double-branch busbar arrangement structure, characterized in that: include: Transformers, which are used to change the voltage of current in power systems; A switch cabinet, which is used to open and close, control and protect electrical equipment in a power system, and the switch cabinet includes a first switch cabinet and a second switch cabinet; a main busbar, one end of which is connected to the transformer; A double-branch busbar includes a first busbar and a second busbar, one end of the first busbar is connected to the first switchgear, one end of the second busbar is connected to the second switchgear, the other end of the first busbar and the other end of the second busbar are respectively connected to the other end of the main busbar away from the transformer, and a soft connector is provided at the junction of the first busbar and the second busbar, which is used to compensate for the displacement and stress caused by vibration or heat generation of the first busbar and the second busbar.

2. The substation using the double-branch busbar arrangement structure according to claim 1 is characterized in that: The first switch cabinet and the second switch cabinet are arranged opposite to each other.

3. The substation using the double-branch busbar arrangement structure according to claim 1 is characterized in that: The first bus bar is located below the second bus bar.

4. The substation using a double-branch busbar arrangement structure according to claim 1, characterized in that: The soft connector comprises a connecting portion and a deformable portion arranged between the two connecting portions.

5. The substation using a double-branch busbar arrangement structure according to claim 1, characterized in that: Creepage-increasing skirts are provided on the outer surfaces of the main busbar, the first busbar and the second busbar, and the creepage-increasing skirts are used to increase the creepage distance of insulation.

6. The substation using a double-branch busbar arrangement structure according to claim 1, characterized in that: The substation further includes a busbar bracket, which is arranged between the transformer and the switch cabinet, and is used to support the main busbar, the first busbar and the second busbar.

7. The substation using the double-branch busbar arrangement structure according to claim 6, characterized in that: The busbar bracket is slidably connected to a slide rail, and the slide rail is connected to a fixing clamp via a roller. The fixing clamp is used to clamp the main busbar, the first busbar and the second busbar.

8. The substation using a double-branch busbar arrangement structure according to any one of claims 1 to 7, characterized in that: The substation includes a prefabricated cabin, and the first switch cabinet and the second switch cabinet are located in the prefabricated cabin.

9. The substation using the double-branch busbar arrangement structure according to claim 8, characterized in that: An operating passage is provided between the first switch cabinet and the second switch cabinet, and the operating passage is used for personnel to enter and operate equipment.

10. The substation using a double-branch busbar arrangement structure according to claim 8, characterized in that: Maintenance passages are respectively provided between the first switch cabinet and the inner wall of the prefabricated cabin, and between the second switch cabinet and the inner wall of the prefabricated cabin. The maintenance passages are used for personnel to enter and perform equipment maintenance.

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