Special-shaped structure wiring terminal for photovoltaic box-type substation

Abstract

A wiring terminal of a special-shaped structure for a photovoltaic box-type substation comprises an integrally-formed copper bar, one end of the copper bar is an inner-end copper bar, the inner-end copper bar is integrally connected with an outer-end copper bar through a middle copper bar, the width of the inner-end copper bar is smaller than that of the outer-end copper bar, and the inner-end copper bar and the outer-end copper bar are provided with a first hole and a second hole respectively. The middle copper bar, the inner-end copper bars and the outer-end copper bars are not in the same plane, and the planes where the inner-end copper bars and the outer-end copper bars are located are not parallel; the inner-end copper bar is connected with the molded case circuit breaker through the first hole, and after a predelivery test is completed, the outer-end copper bar is connected with an external cable through the second hole to realize power-on operation; the width of the inner-end copper bars is smaller than that of the outer-end copper bars, the usage amount of the copper bars can be obviously reduced, the middle copper bars, the inner-end copper bars and the outer-end copper bars are not in the same plane, the insulation distance between the outer-end copper bars can be increased, and potential discharge hazards are reduced.

Description

Technical Field

[0001] The utility model relates to a wiring terminal, in particular to a special-shaped wiring terminal for a photovoltaic box-type substation. Background Art

[0002] At present, photovoltaic box-type substations are widely used in string-type multi-channel photovoltaic power stations. The box-type substation is connected to the photovoltaic power station through the low-voltage incoming cabinet molded case circuit breaker with a wiring terminal to achieve line voltage boost. With the widespread application of string inverters, the low-voltage incoming line plastic case of new energy box-type transformers has undergone tremendous changes. Multiple lines, high voltage, and high current have become new development trends. Taking the photovoltaic 3150kVA product as an example, the number of low-voltage plastic case lines reaches about 18, the current reaches 250~315A, and the rated voltage is 800V, which puts forward new requirements for the quality and economic benefits of the terminal products. The existing low-voltage incoming cabinet molded case circuit breaker terminal blocks usually use an integrated connection terminal, one end of which is connected to the circuit breaker and the other end is connected to the external cable. Although the two-stage connection terminal connection method is simplified and the deformation, local overheating, and operating discharge that may exist at the bolt connection of the two sections of copper bars are avoided, the copper bars at both ends use the same width, resulting in low product versatility, waste of copper bars, and high production costs. At the same time, the insulation distance of the copper bar terminals on the same plane connected to the external cable is small, and there is a hidden danger of discharge. Summary of the invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the utility model is to propose a special-shaped structure terminal for photovoltaic box-type substations, by designing a copper bar with different widths at both ends, and the copper bars at both ends and the middle copper bar are not in the same plane, thereby reducing the use of copper bars, and increasing the insulation distance between multiple copper bars connected to the cable, reducing the discharge risk. To achieve the above purpose, the technical solution of the utility model is:

[0004] A special-shaped terminal block for a photovoltaic box-type substation comprises an integrally formed copper bar, one end of which is an inner copper bar 2, the inner copper bar 2 is integrally connected with an outer copper bar 5 via a middle copper bar 3, the width of the inner copper bar 2 is smaller than the width of the outer copper bar 5, and a first hole 1 and a second hole 4 are respectively provided on the inner copper bar 2 and the outer copper bar 5.

[0005] Furthermore, the middle copper bar 3 and the inner copper bar 2 and the outer copper bar 5 are not in the same plane, and the planes where the inner copper bar 2 and the outer copper bar 5 are located are not parallel.

[0006] Furthermore, threads are provided inside the first hole 1 and the second hole 4 .

[0007] Furthermore, the inner copper bar 2 and the outer copper bar 5 are of any shape.

[0008] Furthermore, the connection between the middle copper bar 3 and the inner copper bar 2 and the outer copper bar 5 is an arc structure.

[0009] The beneficial effects of the utility model are:

[0010] (1) The width of the inner copper bar 2 of the utility model is smaller than that of the outer copper bar 5. On the premise of meeting the width requirements of the wiring terminals of the cables at both ends, the amount of copper bar used is reduced as much as possible, thereby achieving the production requirements of compact string-type multi-channel structure products at a lower cost.

[0011] (2) The middle copper bar 3 of the utility model is not in the same plane as the inner copper bar 2 and the outer copper bar 5, which can increase the insulation distance between the multiple outer copper bars 5 connected to the cables and reduce the discharge risk. At the same time, there is no need to add an insulating layer, which simplifies the operation process and improves the product performance.

[0012] (3) The first hole 1 and the second hole 4 of the terminal block adopt a threaded structure, which increases the connection stability between the terminal block and the circuit breaker and the cable, reduces the risk of local overheating, and reduces the number of bolts used, thereby optimizing the operation steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a stereogram of the utility model.

[0014] Figure 2 It is an installation schematic diagram of the utility model.

[0015] In the figure: 1. First hole; 2. Inner copper busbar; 3. Middle copper busbar; 4. Second hole; 5. Outer copper busbar; 6. Connecting bolt; 7. Molded case circuit breaker; 8. Cable. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0017] A special-shaped terminal block for a photovoltaic box-type substation comprises an integrally formed copper bar, one end of which is an inner copper bar 2, and the inner copper bar 2 is integrally connected with an outer copper bar 5 through a middle copper bar 3; the width of the inner copper bar 2 is smaller than that of the outer copper bar 5, so as to reduce the use of the copper bar and save costs; a first hole 1 and a second hole 4 are respectively provided on the inner copper bar 2 and the outer copper bar 5, the inner copper bar 2 is connected to a molded case circuit breaker 7 through the first hole 1, and the outer copper bar 5 is connected to a cable 8 through the second hole 4.

[0018] Furthermore, the middle copper bar 3, the inner copper bar 2 and the outer copper bar 5 are not in the same plane, the angle between the middle copper bar 3 and the inner copper bar 2 is in the range of 90° to 180°, and the angle between the middle copper bar 3 and the outer copper bar 5 is in the range of 90° to 180°. At the same time, the planes where the inner copper bar 2 and the outer copper bar 5 are located are not parallel. This angle setting can increase the insulation distance between adjacent and interlaced copper bars in actual use and reduce the risk of discharge.

[0019] Furthermore, the first hole 1 and the second hole 4 are provided with M10 to M12 threads, and the first hole 1 and the second hole 4 are respectively connected to the molded case circuit breaker 7 and the cable 8 through the connecting bolts 6, which can increase the connection stability between the copper busbars at both ends and the molded case circuit breaker 7 and the cable 8.

[0020] Furthermore, the inner copper bar 2 and the outer copper bar 5 are of any shape, preferably a regular shape such as a rectangle, a trapezoid, or an ellipse, to facilitate actual production and minimize the amount of copper bars used.

[0021] Furthermore, the middle copper bar 3 is connected to the inner copper bar 2 and the outer copper bar 5 through a 0° to 90° arc structure transition, and the middle copper bar 3 and the inner copper bar 2 have the same width, which can save copper bar usage.

[0022] In actual use, three separate special-shaped wiring terminals are installed as a group of wiring terminals. The outer copper busbar 5 of the middle wiring terminal is selected to face upward or downward when viewed from the front, and the outer copper busbar 5 of the wiring terminals on both sides is selected to face downward or upward when viewed from the front. This can significantly increase the insulation distance between the outer copper busbars 5, thereby reducing the discharge risk and improving the product's operating performance. When the installation space in the low-voltage incoming line cabinet is limited and the outer copper busbar 5 cannot be installed separately up and down in the direction of the front surface, wiring terminals with different angles between the middle copper busbar 3 and the outer copper busbar 5 can be used. They can be installed from one side to the other in order of the size of the angle, so that the outer copper busbar 5 is staggered in a stepped manner, thereby increasing the insulation distance between the outer copper busbars 5, reducing the discharge risk and improving the product's operating performance. At the same time, the special-shaped wiring terminals can also be used in conjunction with other types of connection terminals.

[0023] The working principle of the utility model is as follows: when the utility model is used, the first hole 1 on the inner copper busbar 2 is connected to the molded case circuit breaker 7 of the low-voltage incoming line cabinet by using the connecting bolt 6, and after all the special-shaped wiring terminals are connected, a factory test is performed, and the qualified products are delivered to the customer's operation site, and then the second hole 4 of the outer copper busbar 5 is connected to the external cable 8 by using the connecting bolt 6, and after the handover test is performed on site, power is supplied for operation, and the special-shaped wiring terminals connect the molded case circuit breaker of the low-voltage incoming line cabinet with the photovoltaic power station to play the role of power connection wires.

Claims

1. A special-shaped terminal block for photovoltaic box-type substation, comprising an integrally formed copper bar, characterized in that: One end of the copper bar is an inner copper bar (2), and the inner copper bar (2) is integrally connected to the outer copper bar (5) through the middle copper bar (3). The width of the inner copper bar (2) is smaller than the width of the outer copper bar (5). The inner copper bar (2) and the outer copper bar (5) are respectively provided with a first hole (1) and a second hole (4); the middle copper bar (3) and the inner copper bar (2) and the outer copper bar (5) are not in the same plane, and the planes on which the inner copper bar (2) and the outer copper bar (5) are located are not parallel; and the first hole (1) and the second hole (4) are provided with threads inside.

2. The special-shaped terminal block for photovoltaic box-type substation according to claim 1 is characterized in that: The included angle between the middle copper bar (3) and the inner copper bar (2) is in the range of 90° to 180°, and the included angle between the middle copper bar (3) and the outer copper bar (5) is in the range of 90° to 180°.

3. The special-shaped terminal block for photovoltaic box-type substation according to claim 1 is characterized in that: The first hole (1) and the second hole (4) are provided with M10 to M12 threads inside.

4. The special-shaped terminal block for photovoltaic box-type substation according to claim 1, characterized in that: The inner copper bar (2) and the outer copper bar (5) are of any shape.

5. The special-shaped terminal block for photovoltaic box-type substation according to claim 1, characterized in that: The connection between the middle copper bar (3), the inner copper bar (2) and the outer copper bar (5) is an arc structure.

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