Three-phase dry-type core shunt reactor grounding system

Abstract

The present application belongs to the field of dry core reactor manufacturing, and relates to a three-phase dry core shunt reactor grounding system, which comprises a clamp grounding structure and a core grounding structure. The clamp comprises the following metal structural parts: an upper clamp web, a lower clamp web, an AC phase upper cross beam, a B phase upper cross beam, an AC phase lower cross beam, a B phase lower cross beam, a pressing beam, a pad foot, an upper side beam and a lower side beam. The core comprises an upper iron yoke, a lower iron yoke and a core column. The metal structural parts of the clamp are connected in insulation or in electricity through fastening bolts, yoke penetrating screws and pulling screws to form the clamp grounding structure. The core column screw penetrates the upper iron yoke, the lower iron yoke and the core column to form the core grounding structure in electricity. The core column is internally embedded with a grounding wire, which is led out and fixedly connected to the upper clamp support plate, which is welded to the upper clamp web. The present application ensures reliable grounding of the core, the clamp and other metal structural parts, ensures no circulating current in the system and realizes one-point grounding.

Description

Technical Field

[0001] This invention belongs to the field of dry-type iron-core reactor manufacturing, specifically relating to a grounding system for a three-phase dry-type iron-core parallel reactor. Background Technology

[0002] During operation, the core, clamps, and other metal components of a dry-type iron-core reactor are all situated in a strong electric field, resulting in a high potential to ground. Because the core, clamps, and other metal components are located in a non-uniform magnetic field, the electromotive forces induced by the magnetic field are unequal in magnitude. This potential difference can lead to discharge phenomena; therefore, the core, clamps, and other metal components must be reliably grounded. To prevent circulating currents from causing overheating in the core and clamps, a single-point grounding must also be ensured for the core and clamps.

[0003] Currently, there is no effective and reliable grounding system specifically designed for three-phase dry-type iron-core reactors in the industry. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a three-phase dry-type iron-core parallel reactor grounding system. The technical solution adopted by this invention is as follows:

[0005] A three-phase dry-type iron-core parallel reactor grounding system includes a clamp grounding structure and an iron core grounding structure. The clamp includes the following metal structural components: upper clamp web, lower clamp web, AC phase upper crossbeam, B phase upper crossbeam, AC phase lower crossbeam, B phase lower crossbeam, pressure beam, pad, upper side beam and lower side beam. The iron core includes an upper yoke, a lower yoke and a core column.

[0006] The clamp grounding structure is as follows: the AC phase upper crossbeam, pressure beam, upper side beam, and upper clamp web are insulatedly connected to the upper clamp web on the high-voltage side via fastening bolts, and electrically connected to the upper clamp web on the low-voltage side via fastening bolts; the AC phase lower crossbeam is insulatedly connected to the lower clamp web on both the high-voltage and low-voltage sides via fastening bolts; the lower side beam and pad are insulatedly connected to the lower clamp web on the high-voltage side via fastening bolts, and electrically connected to the lower clamp web on the low-voltage side via fastening bolts; the B phase upper crossbeam and B phase lower crossbeam are connected via fastening bolts... The upper clamp web and the lower clamp web are electrically connected on the high-voltage side and the low-voltage side, respectively. The through-yoke screw passes through the upper clamp web and the lower clamp web on the high-voltage side and the low-voltage side, respectively, and is connected to the iron yoke silicon steel sheet. The through-yoke screw is insulated from the upper clamp web and the lower clamp web on the high-voltage side, and is electrically connected to the upper clamp web and the lower clamp web on the low-voltage side. The pull screw passes through the pressure beam, the pad, the upper side beam and the lower side beam, respectively. The pull screw is insulated from the upper clamp web on the high-voltage side and the low-voltage side, and is electrically connected to the lower clamp web on the high-voltage side and the low-voltage side.

[0007] The core grounding structure is as follows: the core screw passes through the upper yoke, the lower yoke, and the core column, and the core screw is electrically connected to the AC phase upper crossbeam, the B phase upper crossbeam, the AC phase lower crossbeam, and the B phase lower crossbeam, respectively.

[0008] The connection structure of the clamp grounding structure and the iron core grounding structure is as follows: the upper iron yoke is electrically connected to the upper clamp web plate through a grounding plate, and the lower iron yoke is electrically connected to the lower clamp web plate through a grounding plate. A grounding wire is pre-embedded inside the core column, and the grounding wire is led out and fixedly connected to the upper clamp support plate by bolts. The upper clamp support plate is welded to the upper clamp web plate, and the upper clamp support plate has a reserved grounding wire hole. The upper clamp support plate is located on both sides of the core column.

[0009] Preferably, the insulating connection structure for achieving the insulating connection is as follows: an insulating tube is installed on the outer periphery of the fastening bolt and the outer periphery of the contact part between the tie rod and the metal structural component; an insulating washer is installed between the head of the fastening bolt and the contact part between the tie rod and the metal structural component; an insulating plate is installed between the web plate of the upper clamping member and the upper crossbeam of AC phase, the pressure beam and the upper crossbeam of B phase; and an insulating plate is installed between the web plate of the lower clamping member and the lower crossbeam of AC phase, the pad and the lower crossbeam of B phase.

[0010] Preferably, the grounding piece is a tin-plated copper strip with a thickness of 0.3 mm.

[0011] The beneficial effects of this invention are:

[0012] The grounding system of this invention ensures reliable grounding of the core, clamps, and other metal structural components, while also preventing circulating currents within the system, achieving single-point grounding. It provides a reliable grounding system for dry-type core reactors with complex clamp structures. This grounding system is rationally designed, highly reliable, and simple to manufacture, making it valuable for widespread application. Through electrical and insulating connections with bolts, the clamps and other metal components form a single-point grounding system. The reactor core column and upper and lower yokes are connected to the clamps at a single point via grounding wires, thereby achieving single-point grounding of the core. Attached Figure Description

[0013] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some specific embodiments of the present invention. For those skilled in the art, other drawings falling within the scope of protection of this application can be obtained based on these drawings without any creative effort.

[0014] Figure 1 This is a front view of a three-phase dry-type iron-core reactor grounding system according to an embodiment of the present invention;

[0015] Figure 2This is a top view of a three-phase dry-type iron-core reactor grounding system according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the clamp and core grounding structure according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the bolt-insulated connection structure according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the bolt electrical connection structure according to an embodiment of the present invention;

[0019] Among them, 1. Upper clamp web, 2. Upper yoke, 3. Core column, 4. Lower yoke, 5. Lower clamp web, 6. AC phase upper crossbeam, 7. Pressure beam, 8. B phase upper crossbeam, 9. AC phase lower crossbeam, 10. Pad, 11. B phase lower crossbeam, 12. Pull screw, 13. Through yoke screw, 14. Upper side beam, 15. Insulating washer, 16. Insulating tube, 17. Grounding plate, 18. Clamp support plate, 19. Grounding wire, 20. Insulating plate, 21. Fastening bolt, 22. Core column screw, 23. Lower side beam. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] like Figure 1 The image shown is a front view of a three-phase dry-type iron-core reactor grounding system according to an embodiment of the present invention; as shown... Figure 2 The image shown is a top view of a three-phase dry-type iron-core reactor grounding system according to an embodiment of the present invention. A three-phase dry-type iron-core parallel reactor grounding system includes a clamp grounding structure and an iron-core grounding structure.

[0022] The clamping component includes upper and lower clamping webs (upper clamping web 1 and lower clamping web 5), upper and lower crossbeams (AC phase upper crossbeam 6, B phase upper crossbeam 8, AC phase lower crossbeam 9 and B phase lower crossbeam 11), pressure beam 7, pad 10, side beams (upper side beam 14 and lower side beam 23), and other metal structural components, which are fixedly installed as a whole by fastening bolts 21, core column screws 22, through yoke screws 13 and pull screws 12. The metal structural components such as the AC phase upper crossbeam 6, pressure beam 7, and upper side beam 14 are all insulatedly connected to the upper clamping web 1 on the high-voltage side via fastening bolts 21, and electrically connected to the upper clamping web 1 on the low-voltage side via fastening bolts 21. The AC phase lower crossbeam 9 is insulatedly connected to the lower clamping web 5 on both the high-voltage and low-voltage sides via fastening bolts 21. The lower side beam 23 and pad 10 are insulatedly connected to the lower clamping web 5 on the high-voltage side via fastening bolts 21, and electrically connected to the lower clamping web 5 on the low-voltage side via fastening bolts 21. The B phase upper crossbeam 8 and B phase lower crossbeam 11 are electrically connected to the upper clamping web 1 and lower clamping web 5 on both the high-voltage and low-voltage sides via fastening bolts 21.

[0023] Insulating plates 20 are placed between the webs of the upper and lower clamping members and the upper and lower crossbeams, pressure beams 7 and pads 10 to ensure insulation between them. When the fastening bolts 21 tighten the clamping members, the addition of insulating washers 15 and insulating tubes 16 achieves a bolted insulated connection between the webs of the clamping members and other metal structural members. Otherwise, the webs of the clamping members and other metal structural members are electrically connected by bolts.

[0024] The iron core includes upper and lower yokes (upper yoke 2 and lower yoke 4) and core column 3. Grounding of the upper and lower yokes is mainly achieved through an electrical connection between grounding plates 17 and the webs of the upper and lower clamping members. The grounding plates 17 are tin-plated copper strips with a thickness of 0.3 mm. During core stacking, the grounding plates 17 are pre-embedded in the upper yoke 2 and lower yoke 4, respectively, and inserted between two silicon steel sheets. During core assembly, grounding wire holes are pre-drilled at corresponding positions on the webs of the clamping members. The grounding plates 17 are then bolted to the webs of the clamping members to achieve grounding connection between the upper and lower yokes and the clamping members. Grounding of the core column 3 is achieved by pre-embedding grounding wires 19 inside the core column 3 and leading them out to the upper clamping member support plate 18 via bolts, thus achieving grounding connection between the core column and the clamping members. The upper clamping member support plate 18 is welded to the upper clamping member web 1, has pre-drilled grounding wire holes, and is located on both sides of the core column 3.

[0025] The through-yoke screw 13 passes through the upper and lower clamping webs and the silicon steel sheet of the yoke on both the high-voltage and low-voltage sides. The function of the through-yoke screw 13 is to securely fasten the clamping webs and the yoke horizontally. The through-yoke screw 13 is insulated from both the upper clamping web 1 and the lower clamping web 5 on the high-voltage side, and electrically connected to both the upper clamping web 1 and the lower clamping web 5 on the low-voltage side. There are eight pull screws 12, used for vertically clamping the upper and lower clamping webs, and for connecting and fixing the pressure beam 7, the pad 10, and the upper and lower side beams. The pull screws 12 achieve insulated connection to the upper clamping web 1 on both the high-voltage and low-voltage sides by adding insulating tubes 16 and insulating washers 15; the pull screws 12 achieve electrical connection to the lower clamping web 5 on both the high-voltage and low-voltage sides by using nuts and metal washers without adding insulating tubes 16 and insulating washers 15.

[0026] like Figure 3 The diagram shown is a schematic diagram of the clamp and iron core grounding structure according to an embodiment of the present invention; Figure 3 The hollow circle in the diagram represents the bolted insulated connection structure, while the solid circle represents the bolted electrical connection structure. The core screw 22 is electrically connected to the upper and lower crossbeams of phases A, B, and C. The core screw 22 passes through the upper and lower yokes and the core column 3, and is used for the overall clamping of the upper and lower yokes and the core column, thereby connecting the web plates of the upper and lower clamping parts into a whole. Figure 3 In the diagram, except for the solid circles at both ends of the core post 3 (representing the core post screw 22), all other hollow and solid circles represent the positions of the fastening bolts 21.

[0027] like Figure 4 The diagram shown is a schematic representation of a bolt-insulated connection structure according to an embodiment of the present invention; as shown... Figure 5 The diagram shown is a schematic representation of the bolt electrical connection structure according to an embodiment of the present invention. In this bolt electrical connection structure, the bolt not only serves a fastening function but also provides electrical conductivity between the two sides of the connection. In this bolt insulated connection structure, the bolt is insulated from the metal component on one side by adding an insulating tube 16 and an insulating washer 15. Figure 5 Taking the structure of fastening bolt 21 as an example, similarly, for pull screw 12, through yoke screw 13 and core screw 22, electrical connection is also achieved through screws and metal structural components. By adding insulating tube 16 and insulating washer 15 to the end of the screw, the screw itself is insulated from the metal structural components (pressure beam, pad, crossbeam, etc.), thereby making the clamp and iron core insulated from the aforementioned metal structural components.

[0028] The entire clamp grounding structure ensures no internal loops and connects to the grounding network via a grounding wire, thus achieving single-point grounding. The core grounding structure connects to a single point on the clamp via the upper and lower yokes and the core column, achieving its own single-point grounding. The clamp grounding structure and the core grounding structure together constitute the three-phase dry-type core reactor grounding system of this embodiment of the invention.

[0029] In the embodiments of the present invention, all technical features not described in detail are existing technologies or conventional technical means, and will not be repeated here.

[0030] Finally, it should be noted that the above embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A three-phase dry-type iron-core parallel reactor grounding system, comprising a clamp grounding structure and an iron-core grounding structure, wherein the clamp comprises the following metal structural components: an upper clamp web (1), a lower clamp web (5), an AC phase upper crossbeam (6), a B phase upper crossbeam (8), an AC phase lower crossbeam (9), a B phase lower crossbeam (11), a pressure beam (7), a pad (10), an upper side beam (14), and a lower side beam (23), and the iron core comprises an upper yoke (2), a lower yoke (4), and a core column (3); characterized in that: The clamp grounding structure is as follows: the AC phase upper crossbeam (6), pressure beam (7), upper side beam (14) and upper clamp web (1) are insulatedly connected to the upper clamp web (1) on the high voltage side by fastening bolts (21), and electrically connected to the upper clamp web (1) on the low voltage side by fastening bolts (21); the AC phase lower crossbeam (9) is insulatedly connected to the lower clamp web (5) on the high voltage side and the low voltage side by fastening bolts (21), the lower side beam (23) and pad (10) are insulatedly connected to the lower clamp web (5) on the high voltage side by fastening bolts (21), and the lower side beam (23) and pad (10) are electrically connected to the lower clamp web (5) on the low voltage side by fastening bolts (21); the B phase upper crossbeam (8) and B phase lower crossbeam (11) are connected by fastening bolts. (21) Electrically connected to the upper clamp web (1) and lower clamp web (5) on the high-voltage side and the low-voltage side; the through screw (13) passes through the upper clamp web (1) and lower clamp web (5) on the high-voltage side and the low-voltage side respectively and the iron yoke silicon steel sheet, the through screw (13) is insulatedly connected to the upper clamp web (1) and lower clamp web (5) on the high-voltage side, and the through screw (13) is electrically connected to the upper clamp web (1) and lower clamp web (5) on the low-voltage side; the pull screw (12) passes through the pressure beam (7), pad (10), upper side beam (14) and lower side beam (23) respectively, the pull screw (12) is insulatedly connected to the upper clamp web (1) on the high-voltage side and the low-voltage side, and the pull screw (12) is electrically connected to the lower clamp web (5) on the high-voltage side and the low-voltage side; The core grounding structure is as follows: the core screw (22) passes through the upper yoke (2), the lower yoke (4), and the core (3), and the core screw (22) is electrically connected to the AC phase upper crossbeam (6), the B phase upper crossbeam (8), the AC phase lower crossbeam (9), and the B phase lower crossbeam (11), respectively. The connection structure of the clamp grounding structure and the iron core grounding structure is as follows: the upper iron yoke (2) is electrically connected to the upper clamp web (1) through the grounding plate (17), the lower iron yoke (4) is electrically connected to the lower clamp web (5) through the grounding plate (17), the core column (3) is pre-embedded with a grounding wire (19), and the grounding wire (19) is led out and fixedly connected to the upper clamp support plate (18) by bolts. The upper clamp support plate (18) is welded on the upper clamp web (1), the upper clamp support plate (18) has a reserved grounding wire hole, and the upper clamp support plate (18) is located on both sides of the core column (3).

2. A three-phase dry-type iron-core parallel reactor grounding system according to claim 1, characterized in that, The insulating connection structure used to achieve the insulating connection is as follows: an insulating tube (16) is installed on the outer periphery of the fastening bolt (21) and the outer periphery of the contact part between the tie rod (12) and the metal structural component; an insulating washer (15) is installed between the head of the fastening bolt (21) and the contact part between the tie rod (12) and the metal structural component; an insulating plate (20) is installed between the upper clamping web plate (1) and the AC phase upper crossbeam (6), pressure beam (7) and B phase upper crossbeam (8); an insulating plate (20) is installed between the lower clamping web plate (5) and the AC phase lower crossbeam (9), pad (10) and B phase lower crossbeam (11).

3. A three-phase dry-type iron-core parallel reactor grounding system according to claim 1, characterized in that, The grounding piece (17) is a tin-plated copper strip with a thickness of 0.3 mm.

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