Transformer transition connection device, transformer and power supply system

Abstract

The invention relates to the technical field of transformers, and discloses a transformer transition connection device, a transformer and a power Supplement.The transformer transition connection device comprises a shell and down-leading conductors, the interior of the shell is a cavity, the multiple down-leading conductors are arranged in the shell, and the two ends of each down-leading conductor extend out of the shell; one end of each leading-down conductor is suitable for being connected with the low-voltage end of the transformer, and the other end of each leading-down conductor is suitable for being connected with the cable. Two ends of each leading-down conductor are respectively connected with the low-voltage end of the transformer and the connecting end of the cable, so that the cable can be communicated with the transformer, and the cable does not need to be bent; the condition that a large direct cable is damaged when being bent is avoided, the construction difficulty is reduced, and the safety and stability of a power supply system are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a transformer transition connection device, a transformer and a power supply system. Background Art

[0002] Common small and medium-load equipment in industrial engineering and construction projects are mostly powered by single-phase or three-phase low-voltage power supplies. However, common low-voltage transmission lines can only transmit power over short distances due to large line losses and voltage drops. Generally, a step-down transformer is used to step down the voltage of a higher voltage level for use nearby.

[0003] As the capacity of the transformer increases, the cross-section of the cable on the low-voltage power outlet side of the transformer also increases. In the existing technology, low-voltage cables are mostly introduced from the bottom. The cables need to be bent 90° and then connected upward to the low-voltage side column head of the transformer. When the cable diameter is large, the large-section cable structure is close to semi-rigid, and it is not easy to bend the cable. During construction, the cable is often faced with construction difficulties or even barbaric construction caused by insufficient cable bending radius, which brings safety hazards to the later construction rectification and the stable operation of the power supply system. Summary of the invention

[0004] In view of this, the present invention provides a transformer transition connection device, a transformer and a power supply system to solve the problem in the prior art that cables with larger diameters are difficult to bend when the cables and transformers are installed.

[0005] In a first aspect, the present invention provides a transformer transition connection device, comprising a shell and a down conductor, wherein the interior of the shell is a cavity, a plurality of down conductors are arranged in the shell, both ends of the down conductors extend out of the shell, one end of the down conductor is suitable for connection to the low-voltage end of the transformer, and the other end of the down conductor is suitable for connection to a cable.

[0006] Beneficial effect: The present invention connects the two ends of multiple down conductors to the low-voltage end of the transformer and the connection end of the cable respectively, so that the cable and the transformer can be connected without bending the cable, thus avoiding the situation where a large direct cable is damaged when bent, reducing the construction difficulty and ensuring the safety and stability of the power supply system.

[0007] In an optional embodiment, the heights of the ends of the multiple down conductors connected to the cables are increased in sequence.

[0008] Beneficial effect: In the present invention, the heights of one end of the multiple down-lead conductors connected to the cable are set in increasing order. When connecting multiple wiring terminals in the cable, there is enough installation space between adjacent down-lead conductors, and the wiring terminals of the cables do not interfere with each other. There is no need to bend the cable at a large angle, which makes construction easier.

[0009] In an optional implementation, at least one down conductor has a bent portion at one end connected to the low voltage end of the transformer.

[0010] Beneficial effect: The present invention provides a bending portion at one end of the down conductor connected to the low-voltage end of the transformer, thereby facilitating the connection of the down conductor to terminal posts at different positions of the low-voltage end of the transformer, thereby making the installation of the down conductor and the transformer more stable.

[0011] In an optional embodiment, a first terminal is provided at the end of the down conductor connected to the low-voltage end of the transformer, and a second terminal is provided at the end of the down conductor connected to the cable. The first terminal is suitable for connecting to the low-voltage end of the transformer, and the second terminal is suitable for connecting to the cable.

[0012] Beneficial effects: The present invention provides a first terminal and a second terminal at both ends of the down conductor, thereby facilitating a stable connection between the down conductor and the low-voltage end of the transformer and the cable, thereby ensuring the stability of the operation of the transformer and the power supply system.

[0013] In an optional implementation, an outer wall of the down conductor is provided with an insulating layer, and the insulating layer is located between the first wiring terminal and the second wiring terminal.

[0014] Beneficial effects: The present invention improves the insulation of the down-conductor by arranging an insulating layer on the outer wall of the down-conductor, thereby improving the safety performance of the transformer transition connection device.

[0015] In an optional embodiment, a plurality of support plates are provided in the shell.

[0016] Beneficial effect: The present invention arranges a plurality of support plates in the shell, thereby improving the stability of the down conductor installed in the shell and meeting the live spacing requirements between the down conductors.

[0017] In an optional embodiment, a plurality of reinforcement plates are provided in the shell, and the down conductor is installed between adjacent reinforcement plates.

[0018] Beneficial effect: The present invention arranges a plurality of reinforcing plates in the shell, thereby improving the stability of the down conductor installed in the shell and meeting the live spacing requirements between the down conductors.

[0019] In an optional embodiment, the transformer transition connection device further includes a junction box, which is detachably connected to the housing, and one end of the down conductor connected to the cable is located in the junction box.

[0020] In a second aspect, the present invention further provides a transformer, comprising a main body and the above-mentioned transformer transition connection device, wherein the main body is provided with a low voltage end, one end of a down conductor is connected to the low voltage end, and the other end of the down conductor is suitable for connection with a cable.

[0021] In an optional embodiment, the transformer further includes a seal, which is disposed between the body and the transformer transition connection device.

[0022] In a third aspect, the present invention also provides a power supply system, including a cable and the above-mentioned transformer, the cable is suitable for being arranged below the ground, the transformer is arranged above the ground, the low-voltage end is arranged at the bottom of the transformer, one end of the down conductor is connected to the low-voltage end, and the other end is connected to the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A front view of a transformer transition connection device according to an embodiment of the present invention;

[0025] Figure 2 A side view of a transformer transition connection device according to an embodiment of the present invention;

[0026] Figure 3 It is a front view of a power supply system according to an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Shell;

[0029] 2. Down conductor;

[0030] 3. Bending part;

[0031] 4. The first terminal;

[0032] 5. Second connection terminal;

[0033] 6. Support plate;

[0034] 7. Reinforcement plate;

[0035] 8. Junction box;

[0036] 9. Ontology;

[0037] 10. Cables;

[0038] 100. Transformer transition connection device. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 described embodiments 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0040] In the related technology, the minimum turning radius of common single-core or three-core cables is 10D to 15D, where D is the cable diameter. 2 Taking the steel-belt armored PVC insulated cross-linked polyethylene sheathed copper cable as an example, its outer diameter is about 60mm and the required minimum turning radius is about 600mm.

[0041] In general civil engineering structures, if a beam-slab structure is used, the cable bridge is laid under the floor slab to avoid the thickness of the beam. Then, due to the increase in the thickness of the beam, a turning radius of 600mm can generally be achieved. If the transformer is arranged in a box-type substation or a prefabricated cabin, the bottom of the box-type substation or prefabricated cabin often adopts a thinner steel structure. If the turning radius requirements are to be met, the position of the cable bridge or bracket must be restricted. Moreover, the bending process of large-diameter power cables themselves is difficult to handle during construction. The larger the diameter, the closer the large-section cable structure is to semi-rigidity. In actual construction, there is a lack of special construction tools, and manual bending is mostly used. Violent operations are inevitable during the process, which makes it difficult to guarantee the quality of the finished product.

[0042] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0043] According to an embodiment of the present invention, on the one hand, Figure 1 and Figure 2 A transformer transition connection device 100 is provided, comprising a shell 1 and a down conductor 2. The interior of the shell 1 is a cavity, and a plurality of down conductors 2 are arranged in the shell 1. Both ends of the down conductors 2 extend out of the shell 1. One end of the down conductor 2 is suitable for connection with the low-voltage end of the transformer, and the other end of the down conductor 2 is suitable for connection with the cable 10.

[0044] Specifically, in this embodiment, the outer shape of the housing 1 is not specifically limited. To conform to the actual situation, the housing 1 in this embodiment is a rectangular structure.

[0045] In this embodiment, multiple down conductors 2 are vertically arranged in parallel in the shell 1, the bottom end of the shell 1 is suitable for connecting to the bottom of the transformer, the top of the down conductor 2 is suitable for connecting to the low-voltage end of the bottom of the transformer, and the bottom end of the down conductor 2 is suitable for connecting to the horizontally laid cable 10.

[0046] In this embodiment, there is no specific limitation on the number of down conductors 2. To conform to the actual situation, in this embodiment, four down conductors 2 are provided, and the four down conductors 2 are respectively connected to the A-phase connection terminal, the B-phase connection terminal, the C-phase connection terminal and the N-phase connection terminal of the low-voltage end of the transformer.

[0047] In this embodiment, the material of the down conductor 2 is not specifically limited. In this embodiment, the down conductor 2 is made of copper or aluminum to meet the actual situation.

[0048] The present invention connects the two ends of multiple down conductors 2 to the low-voltage end of the transformer and the connection end of the cable 10 respectively, so that the cable 10 can be connected to the transformer without bending the cable 10, thereby avoiding the situation where the larger direct cable 10 is damaged when bent, reducing the construction difficulty and ensuring the safety and stability of the power supply system.

[0049] In one embodiment, Figure 1 As shown, the heights of the ends of the multiple down conductors 2 connected to the cable 10 are increased in sequence.

[0050] Specifically, in the present embodiment, the bottom heights of the four down conductors 2 are arranged in increasing order. When the cable 10 extends horizontally from the side of the transformer transition connection device 100 to the down conductor 2, when the successively increasing down conductors 2 are connected to the cables 10 of each phase, the connection ends of the down conductors 2 do not interfere with each other, and there is enough installation space to facilitate construction and installation.

[0051] In the present invention, the heights of one end of the multiple down conductors 2 connected to the cable 10 are set in increasing order. When connecting multiple wiring terminals in the cable 10, there is enough installation space between adjacent down conductors 2, and the wiring terminals of each cable 10 do not interfere with each other. There is no need to bend the cable 10 at a large angle, which is easier to construct.

[0052] In one embodiment, Figure 1 As shown, at least one down conductor 2 is provided with a bent portion 3 at one end connected to the low voltage end of the transformer.

[0053] Specifically, among the four down conductors 2 in this embodiment, the top of the conductor located in the middle position is vertically connected to the terminal post corresponding to the low-voltage end at the bottom of the transformer, and the tops of the other three down conductors 2 are provided with bending portions 3, which are bent in directions away from the two sides of the vertically arranged down conductors 2. The bending portions 3 are bent to be connected to the terminal post corresponding to the low-voltage end at the bottom of the transformer, and gaps are left between the bending portions 3 on adjacent down conductors 2 to meet the safe live distance.

[0054] The present invention provides a bending portion 3 at one end of the down conductor 2 connected to the low-voltage end of the transformer, thereby facilitating the connection of the down conductor 2 to terminal posts at different positions of the low-voltage end of the transformer, thereby making the installation of the down conductor 2 and the transformer more stable.

[0055] In one embodiment, Figure 1 As shown, a first terminal 4 is provided at one end of the down conductor 2 connected to the low voltage end of the transformer, and a second terminal 5 is provided at one end of the down conductor 2 connected to the cable 10. The first terminal 4 is suitable for connecting to the low voltage end of the transformer, and the second terminal 5 is suitable for connecting to the cable 10.

[0056] Specifically, in this embodiment, the first wiring terminal 4 and the second wiring terminal 5 are provided with mounting holes for connecting with the low-voltage end of the transformer and the terminal post on the cable 10 .

[0057] The present invention provides a first terminal 4 and a second terminal 5 at both ends of the down conductor 2, thereby facilitating a stable connection between the down conductor 2 and the low voltage end of the transformer and the cable 10, thereby ensuring the stability of the operation of the transformer and the power supply system.

[0058] In one embodiment, an outer wall of the down conductor 2 is provided with an insulating layer, and the insulating layer is located between the first wiring terminal 4 and the second wiring terminal 5 .

[0059] In this embodiment, the material of the insulating layer is not specifically limited. The insulating layer may be made of polytetrafluoroethylene material or polyolefin polymer material.

[0060] The present invention improves the insulation of the down conductor 2 by arranging an insulating layer on the outer wall of the down conductor 2, thereby improving the safety performance of the transformer transition connection device 100.

[0061] In one embodiment, Figure 1 and Figure 2 As shown, a plurality of support plates 6 are arranged in the housing 1 .

[0062] Specifically, in this embodiment, the support plate 6 is horizontally extended and disposed in the housing 1 , and a plurality of support plates 6 are evenly arranged along the height direction of the housing 1 .

[0063] In the present invention, a plurality of support plates 6 are arranged in the housing 1, thereby improving the stability of the down conductor 2 installed in the housing 1 and satisfying the live spacing requirement between the down conductors 2 at the same time.

[0064] In one embodiment, Figure 1 and Figure 2 As shown, a plurality of reinforcing plates 7 are provided in the housing 1 , and the down conductor 2 is installed between adjacent reinforcing plates 7 .

[0065] Specifically, in this embodiment, the reinforcing plate 7 is fixedly mounted on the supporting plate 6 , and the reinforcing plate 7 is located on both sides of the down conductor 2 .

[0066] In the present invention, a plurality of reinforcing plates 7 are arranged in the housing 1, thereby improving the stability of the down conductor 2 installed in the housing 1 and satisfying the live spacing requirement between the down conductors 2.

[0067] In one embodiment, Figure 1 and Figure 2 As shown, the transformer transition connection device 100 further includes a junction box 8 , which is detachably connected to the housing 1 , and one end of the down conductor 2 connected to the cable 10 is located in the junction box 8 .

[0068] Specifically, the interior of the junction box 8 is a cavity, and the bottom end of the down conductor 2 is located in the cavity. An opening is provided on the side of the junction box 8 facing the cable 10, and the cable 10 passes through the opening to be connected to the down conductor 2. A cable lock can be provided at the opening position of the cable 10 to improve the sealing between the cable 10 and the junction box 8. The top of the junction box 8 is detachably connected to the bottom of the shell 1 by bolts.

[0069] The present invention can protect the connection end between the cable 10 and the down conductor 2 by providing the junction box 8, thereby preventing the connection between the down conductor 2 and the cable 10 from being squeezed, moistened, etc. by the external environment.

[0070] According to an embodiment of the present invention, on the other hand, Figure 3 As shown, a transformer is also provided, including a body 9 and the above-mentioned transformer transition connection device 100, the body 9 is provided with a low voltage end, one end of the down conductor 2 is connected to the low voltage end, and the other end of the down conductor 2 is suitable for connecting to the cable 10.

[0071] Specifically, in this embodiment, the main body 9 is of a rectangular structure, an opening is provided at the bottom of the main body 9, the low-voltage end is arranged in the opening, a terminal head is provided on the low-voltage end, the shell 1 of the transformer transition connection device 100 is installed in the opening, the top of the down conductor 2 is connected to the low-voltage end, and the bottom of the down conductor 2 is connected to the cable 10.

[0072] In this embodiment, the design process of the transformer transition connection device 100 is as follows:

[0073] Determine the transformer capacity based on the load calculation results;

[0074] Determine the maximum operating current and economic operating current of the transformer according to the load characteristics, and determine the cross-sectional size of the low-voltage side down conductor 2;

[0075] According to the operating altitude of the transformer, determine the safe live distance of the 400V side down conductor 2 at the altitude;

[0076] Determine the influence coefficient on the current carrying capacity of the down conductor 2 according to the temperature and humidity of the use environment;

[0077] According to the short-circuit current calculation, check the cross-sectional design dimensions of the down conductor 2;

[0078] According to the above results, the basic data of the transformer transition connection device 100 is determined;

[0079] Determine the connection direction of the transformer transition connection device 100 according to the connection direction of the low-voltage power cable 10;

[0080] The overall design of the transformer transition connection device 100 is determined according to the appearance of the transformer body 9, as well as the transformer stud connection method, coil arrangement method, basic structure arrangement method, shell appearance characteristics, etc.

[0081] In one embodiment, the transformer further comprises a sealing member, which is arranged between the body 9 and the transformer transition connection device 100. In this embodiment, the sealing member may be a sealing gasket or a sealing ring.

[0082] According to an embodiment of the present invention, on the other hand, Figure 3 As shown, a power supply system is also provided, including a cable 10 and the above-mentioned transformer, the cable 10 is suitable for being arranged below the ground, the transformer is arranged above the ground, the low-voltage end is arranged at the bottom of the transformer, one end of the down conductor 2 is connected to the low-voltage end, and the other end is connected to the cable 10.

[0083] Specifically, in this embodiment, the cable 10 is arranged below the ground of the civil structure, and the cable 10 extends horizontally to the location of the transformer. The transformer is arranged in a box-type substation or a prefabricated cabin above the ground, and the bottom of the transformer is in contact with the ground. The upper part of the transformer transition connection device 100 is installed in the transformer, and the lower part of the transformer transition connection device 100 is located below the ground. The down conductor 2 is arranged in a vertical direction, and the top of the down conductor 2 is connected to the low-voltage end of the transformer, and the bottom of the down conductor 2 is connected to the cable 10, so that the cable 10 can be connected to the transformer without bending the cable 10.

[0084] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A transformer transition connection device, characterized in that: include: A shell (1), wherein the interior of the shell (1) is a cavity; Down conductors (2), a plurality of down conductors (2) are arranged in the shell (1), two ends of the down conductors (2) extend outside the shell (1), one end of the down conductor (2) is suitable for being connected to the low-voltage end of the transformer, and the other end of the down conductor (2) is suitable for being connected to the cable (10).

2. The transformer transition connection device according to claim 1, characterized in that: The heights of the ends of the plurality of down conductors (2) connected to the cable (10) are increased in sequence.

3. The transformer transition connection device according to claim 1 or 2, characterized in that: At least one end of the down conductor (2) connected to the low-voltage end of the transformer is provided with a bent portion (3).

4. The transformer transition connection device according to claim 1, characterized in that: The end of the down conductor (2) connected to the low-voltage end of the transformer is provided with a first terminal (4), and the end of the down conductor (2) connected to the cable (10) is provided with a second terminal (5); the first terminal (4) is suitable for connecting to the low-voltage end of the transformer, and the second terminal (5) is suitable for connecting to the cable (10).

5. The transformer transition connection device according to claim 4, characterized in that: An insulating layer is provided on the outer wall of the down conductor (2), and the insulating layer is located between the first wiring terminal (4) and the second wiring terminal (5).

6. The transformer transition connection device according to claim 1, characterized in that: A plurality of support plates (6) are arranged inside the housing (1).

7. The transformer transition connection device according to claim 1, characterized in that: A plurality of reinforcing plates (7) are arranged in the housing (1), and the down conductor (2) is installed between adjacent reinforcing plates (7).

8. The transformer transition connection device according to claim 1, characterized in that: Also includes: A junction box (8) is detachably connected to the housing (1), and one end of the down conductor (2) connected to the cable (10) is located inside the junction box (8).

9. A transformer, characterized in that: include: A body (9), wherein the body (9) is provided with a low-pressure end; The transformer transition connection device (100) according to any one of claims 1 to 8, wherein one end of the down conductor (2) is connected to the low voltage end, and the other end of the down conductor (2) is suitable for being connected to a cable (10).

10. The transformer according to claim 9, characterized in that: Also includes: A sealing member, wherein the sealing member is arranged between the body (9) and the transformer transition connection device (100).

11. A power supply system, characterized in that: include: A cable (10), the cable (10) being suitable for being arranged below the ground; The transformer according to claim 9 or 10, wherein the transformer is arranged above the ground, the low-voltage end is arranged at the bottom of the transformer, one end of the down conductor (2) is connected to the low-voltage end, and the other end is connected to the cable (10).

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