Copper bar capable of preventing abnormal heating and connecting structure with same

Abstract

The invention discloses a copper bar capable of preventing abnormal heating, which comprises a copper bar body, the copper bar body comprises a first plate section, a second plate section and a transition plate section arranged between the first plate section and the second plate section, and the transition plate section is formed by overlapping a plurality of copper sheets. The first plate section and the second plate section are each provided with a plurality of first connecting holes distributed in a rectangular array mode. The invention further provides a connecting structure with the copper bar, the connecting structure comprises a connector bar, the connector bar comprises two clamping plates which are attached to each other, the two clamping plates are each provided with an outwards-protruding cambered surface section and a plane section, the two outwards-protruding cambered surface sections define a tubular body structure, and the two plane sections are each provided with a third connecting hole capable of being matched with a first bolt. And the line bank and the fixed pressing plate are clamped on the two sides of the second plate section. The method has the advantages that the current load capacity is improved, and the situation of power failure of the transformer is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of transformer copper bars, and in particular to a copper bar capable of preventing abnormal heating and a connection structure having the copper bar. Background Art

[0002] The oil-immersed transformer is a new type of high-performance transformer with low loss, low noise, reasonable structure and excellent performance. It uses oil as the main insulation means of the transformer and relies on oil as the cooling medium. The main components of the oil-immersed transformer include iron core, winding, oil tank, oil pillow, respirator, explosion-proof pipe, radiator, transformer bushing, tap changer, gas relay, temperature machine, oil purifier. The oil-immersed transformer can be used for the transformation of urban and rural, industrial and mining enterprises' power grids, and is also suitable for combined transformers and prefabricated substation transformers.

[0003] At present, since the steel plant area currently used by the applicant often needs to use hundreds of oil-immersed transformers, and the transformers are all installed outdoors, the installation parts of the transformer bushings are all designed with closed protection. This design can protect the transformer bushing body from interference and damage from external debris. The transformer bushing is used to assist the high and low leads inside the transformer to be led out to the outside of the oil tank, and then form an electrical connection with the copper bus or cable to allow the current to be led out and shunted. The transformer bushing not only fixes the lead wire, but also insulates the lead wire from the transformer casing; please refer to Figure 1 and Figure 2 , which shows the design shape of the copper busbar and terminal busbar currently in use, as well as the assembly form of the two. During the operation of the oil-immersed transformer, the transformer bushing accessories are the primary components and are installed on the top of the transformer bushing. The transformer bushing accessories include copper busbars and terminal busbars. The terminal busbars play the role of mechanical tensile resistance and contact conduction, and guide the current to the cable position through the copper busbars. The transformer bushing accessories are required to be able to withstand the load current for a long time as a whole. However, the transformer bushing accessories have the problem of unstable use, which leads to power outages in the transformer. The main reason is that the connection between the copper busbar and the terminal busbar generates too much heat, which causes the copper busbar and the terminal busbar to be burned, and even cracked and disconnected in severe cases. At the same time, in the closed protection state, the heat cannot be dissipated, and the transformer bushing will be burned due to excessive temperature, which will cause the transformer to shut down due to oil leakage. The time required for the shutdown processing and startup recovery of the transformer is relatively long, which will seriously affect the normal operation of the rolling line production and reduce productivity. Summary of the invention

[0004] The object of the present invention is to provide a copper busbar capable of preventing abnormal heating and a connection structure having the copper busbar, which can improve the current load capacity, enhance the electrodynamic strength and heat resistance, and avoid transformer power outage failure.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A copper bar capable of preventing abnormal heating comprises a copper bar body, wherein the copper bar body comprises a first plate segment, a second plate segment and a transition plate segment arranged between the first plate segment and the second plate segment, wherein the transition plate segment is formed by stacking a plurality of copper sheets, wherein one side of each of the copper sheets is connected to a side surface of the first plate segment, and the other side of each of the copper sheets is connected to a side surface of the second plate segment, and the first plate segment and the second plate segment are respectively provided with a plurality of first connection holes distributed in a rectangular array.

[0006] Furthermore, the thickness of the copper busbar body is set to 13-15 mm, the lengths of the first plate section and the second plate section are both set to 150 mm, and the length of the transition plate section is set to 280 mm.

[0007] Furthermore, the copper sheet is made of red copper.

[0008] Furthermore, a first bolt is provided in the first connecting hole, a first nut is provided on the first bolt, a fixed clamping plate is provided on the side of the first plate segment and the side of the second plate segment respectively, and the fixed clamping plate is provided with a second connecting hole matching with the first bolt.

[0009] Furthermore, the first bolt is a half-thread bolt.

[0010] The present invention also provides a connection structure, having the copper busbar capable of preventing abnormal heating, and also including a terminal block, wherein the terminal block includes two clamping plates fitted to each other, the two clamping plates are respectively provided with an outer convex arc surface section and a plane section, the two outer convex arc surface sections form a tubular structure, the two plane sections are respectively provided with a third connection hole capable of cooperating with a first bolt, and under normal circumstances, the terminal block and the fixed clamping plate are clamped on both sides of the second plate section.

[0011] Furthermore, one side of the two clamps are connected to each other, and the other side of the clamp is a free side.

[0012] Furthermore, the two plane sections are respectively provided with a plurality of fourth connection holes corresponding to each other, and the plurality of fourth connection holes arranged on the same plane section are distributed longitudinally, a second bolt is arranged in the fourth connection hole, and a second nut is arranged on the second bolt.

[0013] Furthermore, the second bolt is a half-thread bolt.

[0014] Compared with the prior art, the present invention has the following beneficial effects: the present invention changes the structural form, size and material of the copper busbar, optimizes the connection method between the copper busbar and the transformer bushing, improves the current load capacity of the copper busbar when the transformer is overloaded, enhances the electrodynamic strength and heat resistance, avoids abnormal heating at the connection between the copper busbar and the terminal busbar, thereby avoiding cracking or disconnection of the copper busbar and the terminal busbar due to abnormal heating, and avoids the transformer from shutting down due to serious oil leakage caused by high-temperature burning of the transformer bushing, thereby ensuring that the transformer can continue to operate normally under overload conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the existing transformer bushing accessories.

[0016] Figure 2 It is a top view of the existing transformer bushing accessories.

[0017] Figure 3 It is a top view of the copper busbar provided in an embodiment of the present invention.

[0018] Figure 4 It is a rear view of the copper busbar provided in the embodiment of the present invention.

[0019] Figure 5 It is a top view of the connection structure provided by an embodiment of the present invention.

[0020] Figure 6 It is a front view of the connection structure provided by an embodiment of the present invention.

[0021] Figure 7 It is a schematic diagram of the connection structure provided by an embodiment of the present invention being assembled on a transformer bushing.

[0022] Markings in the figure: A1, existing copper busbar; A2, existing terminal block; A3, full-thread bolt; A4, assembly nut; 1, copper busbar body; 2, first plate section; 3, second plate section; 4, transition plate section; 4a, copper sheet; 5, first connecting hole; 6, first bolt; 7, first nut; 8, fixed clamping plate; 9, second connecting hole; 10, terminal block; 11, clamping plate; 11a, convex arc section; 11b, plane section; 12, third connecting hole; 13, fourth connecting hole; 14, second bolt; 15, second nut; 16, transformer bushing; 17, transformer lead. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0024] like Figure 3 and Figure 4As shown, a copper busbar capable of preventing abnormal heating includes a copper busbar body 1, wherein the copper busbar body 1 includes a first plate segment 2, a second plate segment 3, and a transition plate segment 4 arranged between the first plate segment 2 and the second plate segment 3, wherein the transition plate segment 4 is formed by stacking a plurality of copper sheets 4a, wherein one side of each of the copper sheets 4a is connected to the side surface of the first plate segment 2, and the other side of each of the copper sheets 4a is connected to the side surface of the second plate segment 3, and the first plate segment 2 and the second plate segment 3 are respectively provided with a plurality of first connection holes 5 distributed in a rectangular array.

[0025] The thickness of the copper bar body 1 is set to 13-15 mm, the lengths of the first plate section 2 and the second plate section 3 are both set to 150 mm, and the length of the transition plate section 4 is set to 280 mm. The copper sheet 4a is made of red copper.

[0026] The first connection hole 5 is provided with a first bolt 6, on which a first nut 7 is provided, and the side surfaces of the first plate section 2 and the second plate section 3 are provided with fixed clamping plates 8, respectively, and the fixed clamping plates 8 are provided with second connection holes 9 matched with the first bolt 6. The first bolt 6 is a half-thread bolt.

[0027] In this embodiment, the structural form, size, and material of the copper busbar body 1 are adjusted and changed, which can effectively avoid abnormal heating of the copper busbar body 1, optimize and improve the current load capacity of the copper busbar body 1, enhance the electrodynamic strength and heat resistance, so that the copper busbar body 1 can effectively carry the overload current, and ensure the stability and safety of the current conduction of the copper busbar body 1 when the transformer is overloaded, thereby ensuring that the transformer can continue to operate normally under overload conditions.

[0028] It should be understood that the transition plate segment 4 is formed by pressing a plurality of copper sheets 4a so that the plurality of copper sheets 4a fit closely together. Specifically, the two sides of the transition plate segment 4 are respectively welded to the sides of the first plate segment 2 and the second plate segment 3, and the surfaces are pressed and combined into one by tinning. At the same time, the thickness of the copper busbar body 1 is controlled at 13 to 15 mm, so that the transition plate segment 4 as a whole will not be loosely layered, thereby ensuring the normal current conduction of the copper busbar body 1 and avoiding the occurrence of electrolytic corrosion of the copper busbar body 1.

[0029] It should be understood that the copper sheet 4a is made of red copper material, which can improve its electrical conductivity.

[0030] It should be understood that the fixing clamping plate 8 can not only increase the contact area between the screw head of the first bolt 6 and the first plate segment 2 and the second plate segment 3, but also prevent the screw head of the first bolt 6 from wearing the surface of the first plate segment 2 and the second plate segment 3, thereby preventing the copper busbar body 1 from generating local heating at a certain point due to the current concentrated accumulation caused by the uneven surface.

[0031] It should be understood that the combination design of the first bolt 6 and the first nut 7 is used to fix the copper busbar body 1 with other conductive parts, wherein the first bolt 6 is a half-thread bolt, and the unthreaded portion of the half-thread bolt can fill the gaps between the first bolt 6 and the first plate segment 2, the second plate segment 3, and the fixed clamping plate 8, respectively, so that the unthreaded portion of the first bolt 6 can be close to the hole walls of the first connecting hole 5 and the second connecting hole 9, respectively, reducing or eliminating the possibility of local overheating caused by the concentrated accumulation of current in the gap, thereby avoiding abnormal heating at the connection of the copper busbar body 1.

[0032] like Figure 5 , Figure 6 and Figure 7 As shown, the present invention also provides a connection structure, having the copper busbar capable of preventing abnormal heating, and also including a terminal block 10, wherein the terminal block 10 includes two mutually fitted clamps 11, wherein the two clamps 11 are respectively provided with an outer convex arc surface section 11a and a plane section 11b, wherein the two outer convex arc surface sections 11a form a tubular structure, and the two plane sections 11b are respectively provided with a third connection hole 12 capable of cooperating with the first bolt 6, and under normal circumstances, the terminal block 10 and the fixed clamping plate 8 are clamped on both sides of the second plate section 3.

[0033] One side of the two clamping plates 11 is connected to each other, and the other side of the clamping plates 11 is a free side.

[0034] The two plane sections 11b are respectively provided with a plurality of fourth connection holes 13 corresponding to each other, and the plurality of fourth connection holes 13 provided on the same plane section 11b are longitudinally distributed, and a second bolt 14 is provided in the fourth connection hole 13, and a second nut 15 is provided on the second bolt 14. The second bolt 14 is a half-thread bolt.

[0035] Different from the prior art, the present invention not only optimizes the structural shape of the terminal block 10, but also optimizes the connection mode among the copper busbar body 1, the terminal block 10 and the transformer lead 17. The specific optimization is as follows: first, the contact area between the terminal block 10 and the transformer lead 17 is increased, so that more current can be guided; second, the two clamping plates 11 of the terminal block 10 are tightened by using the second bolt 14 and the second nut 15 to ensure that the terminal block 10 can be stably fixed on the transformer bushing 16, which has the effect of mechanical tensile resistance and also ensures that the two clamping plates 11 are tightly fitted to avoid the occurrence of electro-corrosion. The second bolt 14 adopts a half-thread bolt to ensure that the non-threaded part of the second bolt 14 is tightly fitted with the fourth connecting hole 13, eliminating the existence of the gap part.

[0036] It can be understood that when the first bolt 6 is placed in the third connecting hole 12, the unthreaded portion of the first bolt 6 fits tightly against the hole wall of the third connecting hole 12, reducing or eliminating the possibility of local overheating due to the accumulation of current in the gap, and avoiding abnormal heating at the connection between the copper busbar body 1 and the terminal block 10.

Claims

1. A copper bar capable of preventing abnormal heating, comprising a copper bar body (1), characterized in that: The copper busbar body (1) comprises a first plate segment (2), a second plate segment (3) and a transition plate segment (4) arranged between the first plate segment (2) and the second plate segment (3); the transition plate segment (4) is formed by stacking a plurality of copper sheets (4a); one side of each of the copper sheets (4a) is connected to a side surface of the first plate segment (2); and the other side of each of the copper sheets (4a) is connected to a side surface of the second plate segment (3); and the first plate segment (2) and the second plate segment (3) are respectively provided with a plurality of first connection holes (5) distributed in a rectangular array.

2. The copper busbar capable of preventing abnormal heating according to claim 1, characterized in that: The thickness of the copper busbar body (1) is set to 13-15 mm, the lengths of the first plate section (2) and the second plate section (3) are both set to 150 mm, and the length of the transition plate section (4) is set to 280 mm.

3. The copper busbar capable of preventing abnormal heating according to claim 1, characterized in that: The copper sheet (4a) is made of red copper.

4. The copper busbar capable of preventing abnormal heating according to any one of claims 1 to 3, characterized in that: A first bolt (6) is provided in the first connecting hole (5), a first nut (7) is provided on the first bolt (6), a fixed clamping plate (8) is provided on the side surface of the first plate segment (2) and the side surface of the second plate segment (3), respectively, and a second connecting hole (9) is provided on the fixed clamping plate (8) that matches the first bolt (6).

5. The copper busbar capable of preventing abnormal heating according to claim 4, characterized in that: The first bolt (6) is a half-thread bolt.

6. A connection structure having a copper busbar capable of preventing abnormal heating as claimed in claim 4 or 5, characterized in that: It also includes a terminal block (10), wherein the terminal block (10) includes two mutually fitted clamping plates (11), the two clamping plates (11) are respectively provided with an outer convex arc surface section (11a) and a plane section (11b), the two outer convex arc surface sections (11a) are surrounded by a tubular structure, and the two plane sections (11b) are respectively provided with a third connecting hole (12) that can cooperate with the first bolt (6). Under normal circumstances, the terminal block (10) and the fixed clamping plate (8) are clamped on both sides of the second plate section (3).

7. The connection structure according to claim 6, characterized in that: One side of the two clamping plates (11) is connected to each other, and the other side of the clamping plates (11) is a free side.

8. The connection structure according to claim 6 or 7, characterized in that: The two plane sections (11b) are respectively provided with a plurality of fourth connection holes (13) corresponding to each other, and the plurality of fourth connection holes (13) provided on the same plane section (11b) are distributed longitudinally, a second bolt (14) is provided in the fourth connection hole (13), and a second nut (15) is provided on the second bolt (14).

9. The connection structure according to claim 8, characterized in that: The second bolt (14) is a half-thread bolt.

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