A power input component for high-power low-voltage SVG and APF

Abstract

The invention discloses a power input component for high-power low-voltage SVG and APF, comprising a parallel A-phase branch, a B-phase branch, a C-phase branch and a panel, wherein the A-phase branch, the B-phase branch and the C-phase branch respectively comprise an external wiring shield, a fuse, a main relay, a current limiting relay, a current limiting resistor and a reactor, the external wiring shield, the fuse, the main relay and the reactor are sequentially connected in a straight line direction, the current limiting relay and the current limiting resistor are located outside the main relay, and the external wiring shields of the A-phase branch, the B-phase branch and the C-phase branch are fixed on the panel. The invention has the characteristics of simple structure, low temperature rise, high reliability, small size and low cost.

Description

Technical Field

[0001] The invention relates to a power input component, in particular to a power input component for high-power low-voltage SVG and APF, belonging to the field of SVG and APF. Background Art

[0002] Low-voltage SVG is used for reactive power control of low-voltage power distribution grid, so as to reduce power loss, improve the safety and efficiency of power grid operation, and improve the voltage quality of power grid. Low-voltage APF is used for harmonic control of low-voltage power distribution grid, so as to eliminate harmonic pollution and improve the power quality of power grid. Low-voltage SVG and APF have the same circuit structure, but different programs are written.

[0003] SVG and APF both have essential power input components, including wiring terminals, protective fuses, switches for on-off circuits, filter reactors, etc. For high-power low-voltage SVG and APF, the power loss, reliability, volume, cost, etc. are extremely important because of the large current passing through them. The existing power input components of high-power low-voltage SVG and APF have problems such as improper use of components and unreasonable structure, resulting in large power loss, temperature rise, poor reliability, large volume, and difficulty in production and assembly. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a power input component for high-power low-voltage SVG and APF, so as to improve the reliability of the power input component.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A power input component for high-power low-voltage SVG and APF, characterized in that: it includes an A-phase branch, a B-phase branch, a C-phase branch and a panel arranged in parallel, the A-phase branch, the B-phase branch and the C-phase branch respectively include an external wiring shield, a fuse, a main relay, a current limiting relay, a current limiting resistor and a reactor, the external wiring shield, the fuse, the main relay and the reactor are connected in sequence along a straight line direction, the current limiting relay and the current limiting resistor are located on the outside of the main relay, and the external wiring shields of the A-phase branch, the B-phase branch and the C-phase branch are fixed on the panel.

[0007] Furthermore, a first connecting piece is provided on the lower side of one end of the fuse, and a second connecting piece is provided on the upper side of the other end of the fuse. Both the first connecting piece and the second connecting piece are provided with connecting holes. The first connecting piece of the fuse extends out from the external wiring shield to serve as a wiring terminal for the external power supply of SVG and APF.

[0008] Furthermore, the main relay is provided with a first connecting screw and a second connecting screw, the first connecting screw passes through the connecting hole of the second connecting piece of the fuse and is fastened by a connecting nut, the connecting copper piece is an L-shaped copper piece, and connecting holes are opened at both ends of the connecting copper piece, and the second connecting screw passes through the connecting hole at one end of the connecting copper piece and is fastened by a connecting nut.

[0009] Furthermore, a first connection end is provided at one end of the reactor, and a second connection end is provided at the other end of the reactor. A nut hole is opened at the end of the first connection end. The third connecting screw passes through the connection hole at the other end of the connecting copper piece and is screwed into the nut hole of the first connection end of the reactor for fastening. The second connection end at the other end of the reactor is connected to the relevant circuits of SVG and APF.

[0010] Furthermore, the current limiting relay is provided with a first connection point and a second connection point, the first connection point of the current limiting relay is connected to the first connection screw of the main relay, the current limiting resistor is provided with a third connection point and a fourth connection point, the second connection point of the current limiting relay is connected to the third connection point of the current limiting resistor, and the fourth connection point of the current limiting resistor is connected to the second connection screw of the main relay.

[0011] Furthermore, the reactor includes a circular iron core, a copper rod and a copper sheet. The copper rod is arranged along the axial direction of the circular iron core and is close to the inner hole wall of the circular iron core. Several copper rods are arranged at equal intervals along the circumference of the circular iron core. The copper sheet is arranged on the outside of the circular iron core. One end of one of the several copper rods serves as the first connection end of the reactor and the other end of the copper rod is connected to one end of the copper sheet. The other end of the copper sheet is connected to one end of another copper rod. The copper sheet and the copper rod are connected end to end in an alternating manner in sequence, and the other end of the last copper rod serves as the second connection end of the reactor.

[0012] Furthermore, the ends of the copper rod connected to the copper sheet are bent outward along the radial direction of the circular iron core, nut holes are opened at the ends of the copper rod, and connecting holes are opened at both ends of the copper sheet. The two ends of the copper sheet are fastened in the nut holes of the copper rod by screws and the copper sheet is obliquely arranged on the outside of the circular iron core.

[0013] Furthermore, the annular iron core is composed of multiple small iron cores along the axial direction, gaps are arranged between the small iron cores, an insulator bracket is arranged between the annular iron core and the copper sheet, the outer side of the insulator bracket is fixed to the inner side of the copper sheet, and a block matching the gap of the small iron core is arranged on the inner side of the insulator bracket and the block is embedded in the gap of the small iron core.

[0014] Compared with the prior art, the present invention has the following advantages and effects: the power input component for high-power low-voltage SVG and APF of the present invention is easy to install and has a simple structure, thereby reducing costs, through the reasonable distribution of the external wiring shield, fuse, main relay, current limiting relay, current limiting resistor and reactor structural components; by performing a new structural design on the reactor, the winding structure in the prior art is replaced by a combined structure of copper rods and copper sheets, which has a smaller volume and does not require a winding bracket, thereby freeing up a large amount of space in the center through hole of the iron core, thereby improving the heat dissipation effect of the reactor, and at the same time, the iron core is combined with a small iron core with a gap, thereby further improving the heat dissipation effect of the reactor, effectively solving the problem of excessive temperature increase of the reactor, and improving the reliability of the entire power input component. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a power input component for high-power low-voltage SVG and APF of the present invention.

[0016] Figure 2 Schematic diagram of the fuse of the present invention.

[0017] Figure 3 Schematic diagram of the connecting copper parts of the present invention.

[0018] Figure 4 is a schematic diagram of a reactor of the present invention. DETAILED DESCRIPTION

[0019] In order to elaborate on the technical scheme adopted by the present invention to achieve the predetermined technical purpose, the technical scheme 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 only partial embodiments of the present invention, rather than all embodiments, and the technical means or technical features in the embodiments of the present invention can be replaced without paying creative work. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0020] like Figure 1 As shown, a power input component for high-power low-voltage SVG and APF of the present invention comprises an A-phase branch 1, a B-phase branch 2, a C-phase branch 3 and a panel 10 arranged in parallel, wherein the A-phase branch 1, the B-phase branch 2, and the C-phase branch 3 are parallel to each other, and the A-phase branch 1, the B-phase branch 2, and the C-phase branch 3 are all fixedly mounted on an insulating base plate, and the insulating base plate is vertically fixed on one side of the panel 10.

[0021] The A phase branch 1, the B phase branch 2 and the C phase branch 3 respectively include an external wiring shield 4, a fuse 5, a main relay 6, a current limiting relay 7, a current limiting resistor 8 and a reactor 9. The external wiring shield 4, the fuse 5, the main relay 6 and the reactor 9 are connected in sequence along a straight line. The current limiting relay 7 and the current limiting resistor 8 are located on the outside of the main relay 6. The external wiring shield 4 of the A phase branch 1, the B phase branch 2 and the C phase branch 3 is fixed on the panel 10.

[0022] like Figure 2 As shown, a first connector 12 is disposed at the lower side of one end of the fuse 5, and a second connector 13 is disposed at the upper side of the other end of the fuse 5. The main body of the fuse 5 is a rectangular parallelepiped structure, and the first connector 12 and the second connector 13 are both disposed in the horizontal direction. A connection hole 11 is formed on each of the first connector 12 and the second connector 13. The first connector 12 of the fuse 5 extends from the external wiring shield 4 as a wiring terminal for an external power supply of the SVG and APF.

[0023] The main relay 6 is provided with a first connecting screw 14 and a second connecting screw 15. The first connecting screw 14 passes through the connecting hole 11 of the second connecting member 13 of the fuse 5 and is fastened by a connecting nut 16. Figure 3 As shown, the connecting copper piece 17 is an L-shaped copper piece, and connecting holes 11 are opened at both ends of the connecting copper piece 17. The second connecting screw 15 passes through the connecting hole 11 at one end of the connecting copper piece 17 and is fastened by the connecting nut 16.

[0024] A first connection end 18 is provided at one end of the reactor 9, and a second connection end 19 is provided at the other end of the reactor 9. A nut hole 20 is opened at the end of the first connection end 18. A third connecting screw 21 passes through the connecting hole 11 at the other end of the connecting copper piece 17 and is screwed into the nut hole 20 of the first connection end 18 of the reactor 9 for fastening. The second connection end 19 at the other end of the reactor 9 is connected to the relevant circuits of SVG and APF.

[0025] The current limiting relay 7 is provided with a first connection point 22 and a second connection point 23, and the first connection point 22 of the current limiting relay 7 is connected to the first connection screw 14 of the main relay. The current limiting resistor 8 is provided with a third connection point 24 and a fourth connection point 25, and the second connection point 23 of the current limiting relay 7 is connected to the third connection point 24 of the current limiting resistor 8, and the fourth connection point 25 of the current limiting resistor 8 is connected to the second connection screw 15 of the main relay 6.

[0026] When it is necessary to start the power on, the current limiting relay 7 is first energized, and the current passes through the first connection point 22, the second connection point 23 and the current limiting resistor 8 of the current limiting relay 7. Since the current limiting resistor 8 in the circuit limits the startup current; after a delay period, the main relay 7 is energized, and the current flows directly and unimpeded through the first connecting screw 14 and the second connecting screw 15 of the main relay.

[0027] The connections between the external wiring shield 4, the fuse 5, the main relay 6 and the reactor 9 all adopt a reasonable structural distribution, so that the connecting screws of the connecting parts have sufficient operating space for installation, and the overall installation structure is simple and convenient, which can greatly improve the overall installation efficiency of the power input component and reduce production costs.

[0028] like Figure 4 As shown, the reactor 9 includes a circular iron core 26, a copper rod 27 and a copper sheet 28. The copper rod 27 is arranged along the axial direction of the circular iron core 26 and is close to the inner hole wall of the circular iron core 26. The surface of the circular iron core 26 needs to be insulated. A plurality of copper rods 27 are arranged at equal intervals along the circumference of the circular iron core 26. The copper sheet 28 is arranged on the outside of the circular iron core 26. One end of one of the plurality of copper rods 27 serves as the first connection end 18 of the reactor 9 and the other end of the copper rod 27 is connected to one end of the copper sheet 28. The other end of the copper sheet 28 is connected to one end of another copper rod 27. The copper sheet 28 and the copper rod 27 are connected end to end in sequence. The other end of the last copper rod 27 serves as the second connection end 19 of the reactor 9. The copper rods 27 and the copper sheets 28 are staggered and connected in series, thereby forming a coil form similar to that wound along the circumference of the circular iron core in the S direction. Such a structure is connected in the first place without the need to be wound in a narrow iron core. It is simple and convenient to install, and does not require structures such as slot brackets for winding the coil. The structure is simpler and more compact, and occupies very little space inside the iron core, which is convenient for heat dissipation of the inductor.

[0029] The ends of the copper rod 27 and the copper sheet 28 connected are bent outward along the radial direction of the annular iron core 26. The ends of the copper rod 27 are provided with nut holes 20, and the two ends of the copper sheet 28 are provided with connection holes 11. The two ends of the copper sheet 28 are fastened in the nut holes of the copper rod 27 by screws, and the copper sheet 28 is obliquely arranged on the outside of the annular iron core 26. Since the copper rods 27 are arranged in parallel, the copper sheet needs to connect the two ends of the two adjacent copper rods corresponding thereto, so the copper sheet 28 needs to be obliquely arranged on the outer surface of the iron core.

[0030] The annular iron core 26 is composed of a plurality of small iron cores along the axial direction, with gaps between the small iron cores, an insulator bracket is provided between the annular iron core and the copper sheet, the outer side of the insulator bracket is fixed to the inner side of the copper sheet, and a card block matching the gap of the small iron core is provided on the inner side of the insulator bracket and the card block is embedded in the gap of the small iron core. The iron core further improves the heat dissipation effect of the reactor by combining small iron cores with gaps, effectively solves the problem of excessive temperature rise of the reactor, and improves the reliability of the entire power input component.

[0031] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A power input component for high-power low-voltage SVG and APF, characterized by: It comprises an A-phase branch, a B-phase branch, a C-phase branch and a panel arranged in parallel, wherein the A-phase branch, the B-phase branch and the C-phase branch respectively comprise an external wiring shield, a fuse, a main relay, a current limiting relay, a current limiting resistor and a reactor, the external wiring shield, the fuse, the main relay and the reactor are sequentially connected in a straight line direction, the current limiting relay and the current limiting resistor are located outside the main relay, and the external wiring shields of the A-phase branch, the B-phase branch and the C-phase branch are fixed on the panel; The reactor comprises a circular iron core, a copper rod and a copper sheet. The copper rod is arranged along the axial direction of the circular iron core and is close to the inner hole wall of the circular iron core. A plurality of copper rods are arranged at equal intervals along the circumference of the circular iron core. The copper sheet is arranged on the outer side of the circular iron core. One end of one of the plurality of copper rods serves as the first connection end of the reactor and the other end of the copper rod is connected to one end of the copper sheet. The other end of the copper sheet is connected to one end of another copper rod. The copper sheet and the copper rod are connected end to end in an alternating manner in sequence. The other end of the last copper rod serves as the second connection end of the reactor.

2. A power input assembly for high-power low-voltage SVG and APF according to claim 1, characterized in that: A first connector is provided at the lower side of one end of the fuse, and a second connector is provided at the upper side of the other end of the fuse. Both the first connector and the second connector are provided with connection holes. The first connector of the fuse extends from the external wiring shield to serve as a wiring terminal for the external power supply of SVG and APF.

3. A power input assembly for high-power low-voltage SVG and APF according to claim 2, characterized in that: The main relay is provided with a first connecting screw and a second connecting screw, the first connecting screw passes through the connecting hole of the second connecting piece of the fuse and is fastened by a connecting nut, the connecting copper piece is an L-shaped copper piece, and connecting holes are opened at both ends of the connecting copper piece, and the second connecting screw passes through the connecting hole at one end of the connecting copper piece and is fastened by a connecting nut.

4. A power input assembly for high-power low-voltage SVG and APF according to claim 3, characterized in that: A first connection end is provided at one end of the reactor, and a second connection end is provided at the other end of the reactor. A nut hole is opened at the end of the first connection end. The third connecting screw passes through the connection hole at the other end of the connecting copper piece and is screwed into the nut hole of the first connection end of the reactor for fastening. The second connection end at the other end of the reactor is connected to the relevant circuits of SVG and APF.

5. The power input assembly for high-power low-voltage SVG and APF according to claim 3, characterized in that: The current limiting relay is provided with a first connection point and a second connection point, the first connection point of the current limiting relay is connected to the first connection screw of the main relay, the current limiting resistor is provided with a third connection point and a fourth connection point, the second connection point of the current limiting relay is connected to the third connection point of the current limiting resistor, and the fourth connection point of the current limiting resistor is connected to the second connection screw of the main relay.

6. A power input assembly for high-power low-voltage SVG and APF according to claim 1, characterized in that: The ends of the copper rod connected to the copper sheet are bent outward along the radial direction of the circular iron core. A nut hole is opened at the end of the copper rod, and connecting holes are opened at both ends of the copper sheet. The two ends of the copper sheet are fastened in the nut holes of the copper rod by screws, and the copper sheet is tilted and arranged on the outside of the circular iron core.

7. A power input assembly for high-power low-voltage SVG and APF according to claim 1, characterized in that: The annular iron core is composed of multiple small iron cores along the axial direction, and gaps are arranged between the small iron cores. An insulator bracket is arranged between the annular iron core and the copper sheet, and the outer side of the insulator bracket is fixed to the inner side of the copper sheet. A card block matching the gap of the small iron core is arranged on the inner side of the insulator bracket, and the card block is embedded in the gap of the small iron core.

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