Low voltage direct connection transformer arrangement
By setting up dense busbar trunking and horizontally extending copper busbar connections in the starting box, combined with fixing components and insulators, the problem of local temperature rise in transformer equipment is solved, and more stable and safer power transmission is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU JINBANG ELECTRICAL EQUIP CO LTD
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-14
AI Technical Summary
In a 10/0.4kV power distribution system, the copper busbar connection points are prone to overheating during the connection process between the low-voltage side of the transformer and the downstream power distribution busbar, which can lead to local temperature increases and pose a safety hazard.
The low-voltage direct-connection transformer equipment adopts a dense busbar trunking in the starting box. The busbar copper busbars extend horizontally and are directly connected to the phase copper busbars, reducing heat accumulation. Fixed components and insulators are used to ensure connection stability. Soft connection copper busbars and hollow design are used to reduce heat accumulation.
It effectively reduces local temperature rise, reduces safety risks, improves the stability and safety of equipment operation, and extends the service life of the equipment.
Smart Images
Figure CN224501646U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of transformer equipment technology, and in particular to a low-voltage direct-connected transformer equipment. Background Technology
[0002] In a 10 / 0.4kV power distribution system, the connection between the low-voltage side of the transformer and the downstream distribution busbar is often accomplished using a device called a "starting box" or "feeder unit". This device enables a reliable and efficient electrical connection between the low-voltage outgoing copper busbar of the transformer and the starting conductor (copper busbar) of the dense busbar, ensuring that electrical energy can be safely and stably transmitted from the transformer to the downstream distribution network.
[0003] In traditional transformer-to-base connection, the starting point of the dense busbar trunking within the base is positioned above the low-voltage side copper busbars of the transformer. The copper busbars extend vertically downwards from this starting point, converging in a central area above the transformer's copper busbars. Then, multiple branch copper busbars branch off from this central node, turning and connecting to the A, B, C, and N phase copper busbars on the low-voltage side of the transformer. However, the copper busbar connection points are prone to heat generation. Therefore, after converging in the central area, multiple connection points are concentrated and close together, leading to a localized temperature increase. Utility Model Content
[0004] To address the aforementioned technical problems, this application provides a low-voltage direct-connected transformer device that can reduce the occurrence of localized high temperatures.
[0005] The technical solution provided in this application is described below:
[0006] This application provides a low-voltage direct-connected transformer device, comprising:
[0007] The transformer box and the starting box located on top of the transformer box are provided. The transformer box contains a transformer body, and the low-voltage side of the transformer body is provided with multiple phase copper busbars.
[0008] The starting box is equipped with a dense busbar trunking, which contains multiple busbar copper busbars. The multiple busbar copper busbars extend horizontally, and the end of one busbar copper busbar is aligned vertically with one phase copper busbar.
[0009] The end of each busbar copper busbar is connected to the corresponding phase copper busbar by a lap copper busbar.
[0010] Optionally, the low-voltage direct-connected transformer equipment further includes a fixing component, which is disposed inside the transformer box and is used to fix each of the lap copper busbars.
[0011] Optionally, each of the lap copper busbars is connected to the fixing assembly via an insulator.
[0012] Optionally, the fixing assembly includes a hoisting installation beam and a crossarm support, the crossarm support being connected to the transformer box, the hoisting installation beam being located inside the transformer box and connected to the crossarm support, and the insulator being fixed on the hoisting installation beam.
[0013] Optionally, the insulator is connected to the hoisting beam by bolts.
[0014] Optionally, a pressure plate bracket is provided on the crossarm support, and the upper part of the pressure plate bracket abuts against the compact busbar trunking.
[0015] Optionally, an insulating plate is provided inside the starting box, the insulating plate being located between the ends of adjacent busbar copper busbars, the insulating plate being used to support the busbar copper busbars.
[0016] Optionally, upright brackets are provided on both sides of the starting box, and the insulating plate is fixed on the upright brackets.
[0017] Optionally, the overlapping copper busbar and the phase copper busbar are connected by a flexible connecting copper busbar.
[0018] Optionally, the connection between the transformer box and the starting box is hollowed out.
[0019] As can be seen from the above technical solutions, this application has the following beneficial effects:
[0020] This application involves setting a starting box at the top of the transformer box, and installing a dense busbar trunking inside the starting box. Multiple busbars are arranged horizontally within the dense busbar trunking, with the end of each busbar vertically aligned with a phase busbar within the transformer box. Each busbar is directly connected to its corresponding phase busbar via a connecting copper busbar. This direct connection between each busbar and its corresponding phase busbar, compared to traditional technologies that concentrate heat in the central area, reduces the concentration of heat, thus minimizing localized temperature increases and lowering safety risks. Attached Figure Description
[0021] Figure 1 This is a front view schematic diagram of a low-voltage direct-connected transformer device according to this application;
[0022] Figure 2 This is a side view schematic diagram of a low-voltage direct-connected transformer device according to this application;
[0023] Figure 3 This is a top view schematic diagram of a low-voltage direct-connected transformer device according to this application;
[0024] Figure 4This is a partial schematic diagram of a low-voltage direct-connected transformer device according to this application;
[0025] Figure 5 This is another partial schematic diagram of a low-voltage direct-connected transformer device according to this application;
[0026] Figure 6 This is a schematic diagram of a crossarm support in a low-voltage direct-connected transformer device according to this application;
[0027] In the diagram, there are: transformer box 01, starting box 02, transformer body 03, phase copper busbar 04, compact busbar trunking 05, busbar copper busbar 06, overlapping copper busbar 07, insulator 08, hoisting beam 09, crossarm support 10, pressure plate support 11, insulation plate 12, vertical support 13, and flexible connection copper busbar 14. Detailed Implementation
[0028] In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and other terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to describe the relative positional relationship between the components or parts and do not specifically limit the specific installation orientation of each component or part.
[0029] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0030] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0031] Furthermore, the structures, proportions, sizes, etc., drawn in the accompanying drawings of this application are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modification to the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that this application can produce, should still fall within the scope of the technical content disclosed in this application.
[0032] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0033] See Figures 1 to 6 The low-voltage direct-connected transformer device provided in this application includes:
[0034] The transformer box 01 and the starting box 02 set on top of the transformer box 01 are provided. The transformer body 03 is provided inside the transformer box 01. Multiple phase copper busbars 04 are provided on the low voltage side of the transformer body 03. The starting box 02 is provided with a compact busbar trunking 05. Multiple busbar copper busbars 06 are provided in the compact busbar trunking 05. The multiple busbar copper busbars 06 extend horizontally, and the end of one busbar copper busbar 06 is aligned with one phase copper busbar 04 in the vertical direction. The end of each busbar copper busbar 06 is connected to the corresponding phase copper busbar 04 by a lap copper busbar 07.
[0035] The transformer box 01 houses the transformer body 03, which converts the input high voltage into low voltage to meet the voltage requirements of different electrical devices. On the low-voltage side of the transformer body 03, multiple phase copper busbars 04 are installed. These phase copper busbars 04 correspond to the A, B, and C phases of the power system, as well as the neutral N phase. These phase copper busbars 04 are responsible for transmitting the low-voltage electrical energy converted by the transformer to subsequent power lines.
[0036] The starting box 02 is equipped with a dense busbar trunking 05, which contains multiple busbar copper busbars 06 extending horizontally. Unlike the traditional method of connecting the transformer to the starting box 02, where the copper busbars extend vertically downwards and converge in the central area, this embodiment adopts a horizontally extending layout. This makes the distribution of the busbar copper busbars 06 more dispersed and orderly, effectively avoiding the concentration of multiple connection points in a local area, reducing the heat accumulation problem caused by dense connection points, thereby reducing the risk of local overheating of the equipment and improving the stability and safety of equipment operation.
[0037] The number of busbar copper busbars 06 is the same as the number of phase copper busbars 04 in the transformer body 03, and each busbar copper busbar 06 connects to only one phase copper busbar 04. Specifically, if the busbar copper busbars 06 are divided into a, b, c, and n, when connected to the phase copper busbars 04 (A, B, C, N), the end of a is connected to A through a lap copper busbar 07, the end of b is connected to B through a lap copper busbar 07, and similarly, the end of c is connected to C, and the end of d is connected to D through a lap copper busbar 07. Therefore, the busbar copper busbars 06 only need a single section of lap copper busbar 07 to connect to each phase copper busbar 04 in the transformer body 03, reducing unnecessary turning.
[0038] The overlapping copper busbars 07 are set vertically, perpendicular to the horizontal plane, and are set parallel to each other with a certain spacing.
[0039] In this embodiment, a starting box 02 is installed at the top of the transformer box 01, and a dense busbar trunking 05 is installed inside the starting box 02. Multiple busbar copper busbars 06 are installed within the dense busbar trunking 05, extending horizontally. The end of each busbar copper busbar 06 is vertically aligned with a phase copper busbar 04 within the transformer box 01. Each end of the busbar copper busbar 06 is directly connected to its corresponding phase copper busbar 04 via an overlapping copper busbar 07. Thus, each busbar copper busbar 06 is directly connected to its corresponding phase copper busbar 04 via the overlapping copper busbar 07. Compared to traditional technologies where heat is concentrated in the central area, this application reduces the concentration of heat, thus reducing the concentration of heat points, minimizing localized temperature increases, and lowering safety risks. This reduces the probability of equipment failure due to localized overheating and extends the equipment's service life.
[0040] During the operation of transformer equipment, under the influence of various factors such as electromagnetic force, equipment vibration, and possible external mechanical forces, the lap copper busbars 07 may loosen, shift, or even detach. Therefore, in an optional embodiment, the low-voltage direct-connected transformer equipment also includes a fixing component, which is disposed within the transformer housing 01 and is used to fix each lap copper busbar 07.
[0041] The fixing assembly is installed inside the transformer box 01, and its function is to securely fix each lap copper busbar 07. The fixing assembly ensures that the lap copper busbar 07 is always kept in the correct position and orientation, ensuring a good connection between it and the busbar copper busbar 06 and the phase copper busbar 04.
[0042] Each overlapping copper busbar 07 is fixed at a different position on the fixing component to ensure that the overlapping copper busbar 07 does not become loose.
[0043] To prevent leakage and short circuits between the lap copper busbar 07 and the fixing component, in this optional embodiment, each lap copper busbar 07 is connected to the fixing component by an insulator 08.
[0044] Each lap copper busbar 07 is connected to the fixed component via an insulator 08, which provides reliable electrical insulation. The insulator 08 effectively isolates the electrical path between the lap copper busbar 07 and the fixed component, ensuring that current can only be transmitted through the lap copper busbar 07 along a predetermined path, preventing current leakage to the fixed component and transformer box 01, and ensuring the safety of equipment and personnel.
[0045] In addition, insulator 08 has a certain buffering effect, reducing the impact of vibration on the connection of lap copper busbar 07 and reducing the risk of the connection loosening due to vibration.
[0046] The material of insulator 08 can be ceramic, glass, or organic composite material (insulation). In this application, the material of insulator 08 is not limited, and the material that can be actually realized shall prevail.
[0047] Please continue reading. Figure 5 and Figure 6 In this optional embodiment, the fixing assembly includes a hoisting installation beam 09 and a crossarm support 10. The crossarm support 10 is connected to the transformer box 01. The hoisting installation beam 09 is located inside the transformer box 01 and is connected to the crossarm support 10. The insulator 08 is fixed on the hoisting installation beam 09.
[0048] Two crossarm supports 10 are installed on the transformer box 01. One is located below the compact busbar trunking 05, and the other is located at the end of the busbar copper busbar 06 (the longest busbar copper busbar 06). The two ends of the hoisting installation beam 09 are connected to the two crossarm supports 10 respectively, and the bottom of the hoisting installation beam 09 is parallel to the horizontal plane.
[0049] The crossarm support 10 is installed above the transformer box 01 (located inside the starting box 02), while the hoisting beam 09 is located inside the transformer box 01. The crossarm support 10 and the hoisting beam 09 are connected by a snap fastener; the overlapping copper busbar 07 is connected to the hoisting beam 09 by an insulator 08.
[0050] In this optional embodiment, the insulator 08 is bolted to the hoisting beam 09. This bolted connection facilitates installation and easy disassembly.
[0051] In addition, insulator 08 and lap copper busbar 07 can also be connected by bolts. It should be noted that electrical insulation is ensured between lap copper busbar 07 and hoisting beam 09 (the bolts between insulator 08 and hoisting beam 09, and the bolts between insulator 08 and lap copper busbar 07 do not contact each other to ensure electrical insulation).
[0052] In this optional embodiment, a pressure plate bracket 11 is provided on the crossarm bracket 10, and the upper part of the pressure plate bracket 11 abuts against the dense busbar trough 05.
[0053] In this embodiment, the pressure plate bracket 11 is fixed above the crossarm bracket 10 (the crossarm bracket 10 below the compact busbar 05), and the compact busbar 05 presses on the pressure plate bracket 11. The pressure plate bracket 11 is used to support the compact busbar 05 and prevent the compact busbar 05 from sinking.
[0054] In an optional embodiment, an insulating plate 12 is provided inside the starting box 02. The insulating plate 12 is located between the ends of adjacent busbar copper busbars 06 and is used to support the busbar copper busbars 06.
[0055] In this embodiment, a gap is provided between the ends of each busbar copper bus 06, and an insulating plate 12 is provided in the gap. If the end of busbar a copper bus 06 is adjacent to the end of busbar b copper bus 06, an insulating plate 12 is provided between the end of busbar a copper bus 06 and the end of busbar b copper bus 06 to achieve electrical insulation between the two and prevent short circuit or discharge.
[0056] In addition, the insulating plate 12 is provided with perforations, the size of which matches the size of the busbar copper bus 06 and corresponds to the extension position of the busbar copper bus 06. When the busbar copper bus 06 passes through the perforation, it is supported by the bottom of the perforation. For the longer extension of the busbar copper bus 06, the insulating plate 12 provides support. For example, if the longest extension is busbar a 06, then busbar a 06 will pass through 3 insulating plates 12, and at this time, busbar a 06 will be supported by 3 insulating plates 12 simultaneously.
[0057] In this optional embodiment, upright brackets 13 are provided on both sides of the starting box 02, and the insulating plate 12 is fixed on the upright brackets 13.
[0058] In this embodiment, the connected insulating plates 12 are arranged in parallel, and each insulating plate 12 is fixed by a pair of vertical brackets 13.
[0059] During operation, relative displacement may occur between the overlapping copper busbar 07 and the phase copper busbar 04 due to factors such as temperature changes and mechanical vibration. Therefore, in an optional embodiment, the overlapping copper busbar 07 and the phase copper busbar 04 are connected by a flexible connecting copper busbar 14.
[0060] In this embodiment, the flexible copper busbar 14 can be formed by laminating and welding multiple layers of thin copper foil, or copper braided strip can be used as the substrate. Thin copper foil has good conductivity, high copper content, and low resistivity, which can effectively reduce energy loss and heat generation when current passes through it. Copper braided strip is made of multiple strands of fine copper wire, which has high flexibility and heat dissipation performance. Its braided structure allows air to circulate between the copper wires, which helps dissipate heat.
[0061] The flexible copper busbar 14 can avoid problems such as loose connection and increased contact resistance caused by displacement, thereby reducing equipment failure, improving connection reliability, and always maintaining a good electrical connection.
[0062] In an optional embodiment, the connection between the transformer box 01 and the starting box 02 is hollowed out. In this embodiment, the hollowed-out design facilitates the vertical installation of the overlapping copper busbar 07 and the fixing of the hoisting installation beam 09. The hollowed-out design also facilitates heat dissipation.
Claims
1. A low-voltage direct-connected transformer device, characterized in that, Includes: a transformer box and a starting box disposed on top of the transformer box, wherein a transformer body is disposed inside the transformer box, and multiple phase copper busbars are disposed on the low-voltage side of the transformer body; The starting box is equipped with a dense busbar trunking, which contains multiple busbar copper busbars. The multiple busbar copper busbars extend horizontally, and the end of one busbar copper busbar is aligned vertically with one phase copper busbar. The end of each busbar copper busbar is connected to the corresponding phase copper busbar by a lap copper busbar.
2. The low-voltage direct-connected transformer equipment according to claim 1, characterized in that, The low-voltage direct-connected transformer equipment also includes a fixing component, which is disposed inside the transformer box and is used to fix each of the lap copper busbars.
3. The low-voltage direct-connected transformer equipment according to claim 2, characterized in that, Each of the lap copper busbars is connected to the fixing component via an insulator.
4. The low-voltage direct-connected transformer equipment according to claim 3, characterized in that, The fixing assembly includes a hoisting installation beam and a crossarm support. The crossarm support is connected to the transformer box. The hoisting installation beam is located inside the transformer box and is connected to the crossarm support. The insulator is fixed on the hoisting installation beam.
5. The low-voltage direct-connected transformer equipment according to claim 4, characterized in that, The insulator is connected to the hoisting beam by bolts.
6. The low-voltage direct-connected transformer equipment according to claim 4, characterized in that, A pressure plate bracket is provided on the crossarm support, and the upper part of the pressure plate bracket abuts against the compact busbar trunking.
7. The low-voltage direct-connected transformer equipment according to any one of claims 1 to 6, characterized in that, An insulating plate is provided inside the starting box. The insulating plate is located between the ends of adjacent busbar copper busbars and is used to support the busbar copper busbars.
8. The low-voltage direct-connected transformer equipment according to claim 7, characterized in that, The starting box is provided with upright brackets on both sides, and the insulating plate is fixed on the upright brackets.
9. The low-voltage direct-connected transformer equipment according to any one of claims 1 to 6, characterized in that, The overlapping copper busbar and the phase copper busbar are connected by a flexible connecting copper busbar.
10. The low-voltage direct-connected transformer equipment according to any one of claims 1 to 6, characterized in that, The connection between the transformer box and the starting box is hollowed out.