Core column, core body and lightning arrester

Abstract

The present invention provides a core column, a core body and a lightning arrester. The core column includes: an insulating cylinder, a plurality of resistors and a plurality of arc-isolating mechanisms; wherein each resistor is arranged in the insulating cylinder, and each resistor is arranged in parallel in sequence along the height direction of the insulating cylinder, and a preset gap is provided between the outer peripheral wall of each resistor and the inner wall of the insulating cylinder; an arc-isolating mechanism is arranged between any two adjacent resistors, and each arc-isolating mechanism is used to isolate the arc when the resistor generates an arc. In the present invention, each resistor is arranged in parallel in sequence, and an arc-isolating mechanism is arranged between two adjacent resistors. When any resistor is defective and generates an arc, the two adjacent arc-isolating mechanisms isolate the arc to avoid arc erosion of the adjacent resistors, which can effectively suppress the arc caused by the defective resistors and ensure the stable operation of the remaining resistors. When the core column is applied to the lightning arrester, it can effectively avoid the failure of the lightning arrester and reduce the failure rate of the lightning arrester.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a core column, a core body and a lightning arrester. Background Art

[0002] Large-capacity multi-column parallel arresters are widely used in DC converter stations, AC series compensation devices and other fields. Their main function is to absorb system redundant energy and limit overvoltage. Operation experience shows that large-capacity multi-column parallel arresters have a high failure rate due to the large number of parallel columns. The main reason for the high failure rate is the existence of defective resistors with a very low probability. When the surface of the defective resistor flashes over, it is very easy to burn the adjacent qualified resistors, thus developing into flashover of the entire column of the arrester. Summary of the invention

[0003] In view of this, the present invention proposes a core column, aiming to solve the problem in the prior art that the surface flashover of a defective resistor is easy to burn adjacent qualified resistors. The present invention also proposes a core body having the core column and a lightning arrester having the core body.

[0004] In one aspect, the present invention provides a core column, which includes: an insulating cylinder, multiple resistors and multiple arc isolation mechanisms; wherein each resistor is arranged in the insulating cylinder, and each resistor is arranged in parallel in sequence along the height direction of the insulating cylinder, and a preset gap is provided between the outer peripheral wall of each resistor and the inner wall of the insulating cylinder; an arc isolation mechanism is arranged between any two adjacent resistors, and each arc isolation mechanism is used to isolate the arc when an arc is generated in the resistor.

[0005] Furthermore, in the above-mentioned core column, each arc-isolating mechanism is an arc-isolating pad with a preset thickness, and each arc-isolating pad is clamped between two adjacent resistor sheets; the size of each arc-isolating pad is the same as the size of each resistor sheet, and each arc-isolating pad is provided with a protrusion extending toward the inner wall of the insulating tube along the circumferential direction to block the arc.

[0006] Furthermore, in the above-mentioned core column, the insulating tube is integrally formed, and there is a first preset distance between the outer peripheral wall of each protrusion and the inner wall of the insulating tube.

[0007] Furthermore, in the above-mentioned core column, the insulating tube includes: a plurality of annular connecting sections, each of which is detachably connected in sequence; a plurality of accommodating grooves are provided on the inner wall of the insulating tube, and the outer peripheral wall of each protrusion is provided with a clamping portion extending toward the inner wall of the insulating tube, and each clamping portion is clamped in a accommodating groove.

[0008] Furthermore, in the above-mentioned core column, each arc isolation pad corresponds to the connection between two adjacent connecting sections, and each accommodating groove is opened on the inner wall of the connection between two adjacent connecting sections.

[0009] Furthermore, in the above-mentioned core column, each connecting section includes: a main body, a first extension portion and a second extension portion, all of which are annular; wherein the wall thickness of the main body is greater than the wall thickness of the first extension portion and the wall thickness of the second extension portion; the first extension portion is arranged on the top surface of the main body, and the outer circumferential wall of the first extension portion is aligned with the outer circumferential wall of the main body; the second extension portion is arranged on the bottom surface of the main body, and the inner circumferential wall of the second extension portion is aligned with the inner circumferential wall of the main body; the second extension portion of each connecting section is aligned with the first extension portion of the adjacent connecting section, and the second extension portion of each connecting section has a second preset distance from the top surface of the main body of the adjacent connecting section to form a receiving groove.

[0010] Furthermore, in the above-mentioned core column, the sum of the wall thickness of the first extension portion and the wall thickness of the second extension portion is equal to the wall thickness of the body.

[0011] Furthermore, in the above-mentioned core column, the insulating tube is provided with a plurality of pressure release holes along the height direction.

[0012] In the present invention, each resistor is arranged in parallel in sequence, and an arc isolation mechanism is arranged between two adjacent resistors. When any resistor is defective and an arc is generated, the two adjacent arc isolation mechanisms isolate the arc, so that the arc is placed in the gap between the resistor, the insulating tube and the two arc isolation mechanisms, avoiding the arc from burning adjacent resistors, effectively ensuring that the qualified resistor does not flash over when the defective resistor surface flashes over, and can effectively suppress the arc caused by the defective resistor, ensure the stable operation of the remaining resistors, avoid the defective resistor affecting the remaining qualified resistors, and solve the problem in the prior art that the defective resistor surface flashover is easy to burn the adjacent qualified resistor. The core column has a simple structure and is easy to implement. When the core column is applied to the lightning arrester, it can effectively avoid the failure of the lightning arrester and reduce the failure rate of the lightning arrester.

[0013] On the other hand, the present invention also proposes a core body, which includes: a plurality of epoxy rods, a cover body, a base and any one of the above-mentioned core columns; wherein the cover body is arranged on the top of the core column, the base is arranged on the bottom of the core column, and each epoxy rod is arranged between the cover body and the base at intervals along the circumference of the core column.

[0014] Since the core column has the above-mentioned effects, the core body having the core column also has corresponding technical effects.

[0015] On the other hand, the present invention further provides a lightning arrester, which includes: a composite outer shell and the above-mentioned core body; wherein the core body is arranged inside the composite outer shell.

[0016] Since the core has the above-mentioned effects, the lightning arrester having the core also has corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 A schematic diagram of the structure of a core column provided by an embodiment of the present invention;

[0019] Figure 2 Another structural schematic diagram of a core column provided in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the structure of a lightning arrester provided in an embodiment of the present invention;

[0021] Figure 4 Another structural schematic diagram of the lightning arrester provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Core column embodiment:

[0024] See also Figure 1 to Figure 2 , the figure shows the preferred structure of the core column in this embodiment. As shown in the figure, the core column includes: an insulating cylinder 1, a plurality of resistor sheets 2 and a plurality of arc isolation mechanisms. Among them, each resistor sheet 2 is arranged inside the insulating cylinder 1, and each resistor sheet 2 is stacked in parallel in the height direction of the insulating cylinder 1. Specifically, the height direction of the insulating cylinder 1 is Figure 1 As shown in the top-to-bottom direction, each resistor sheet 2 is stacked and sequentially placed inside the insulating tube 1 .

[0025] There is a preset gap between the outer peripheral wall of each resistor 2 and the inner wall of the insulating tube 1. The preset gap can be determined according to actual conditions, and this embodiment does not impose any restrictions on this. Specifically, the cross section of each resistor 2 is circular, the cross section of the insulating tube 1 is also circular, the central axis of each resistor 2 coincides with the central axis of the insulating tube 1, and the outer diameter of each resistor 2 is smaller than the inner diameter of the insulating tube 1.

[0026] An arc isolation mechanism is provided between any two adjacent resistor sheets 2 , and each arc isolation mechanism is used to isolate the arc when an arc is generated in the resistor sheet 2 , so as to prevent the arc from burning the adjacent resistor sheets 2 .

[0027] When in use, two adjacent resistor pieces 2 are blocked by the arc isolation mechanism. If one of the resistor pieces 2 is defective, an arc will be generated in the gap between the resistor piece 2 and the inner wall of the insulating tube 1. Due to the setting of the arc isolation mechanism, the arc will be blocked by the arc isolation mechanism, and the arc cannot burn the remaining adjacent resistor pieces 2.

[0028] In a specific implementation, the cross section of the insulating tube 1 is circular, and the diameter of the insulating tube 1 is greater than or equal to 120 mm and less than or equal to 300 mm. The insulating tube 1 is made of materials with high insulation strength, ablation resistance, flame retardancy and other properties.

[0029] In specific implementation, the diameter of each resistor sheet 2 is 105 mm. Each resistor sheet 2 can be a zinc oxide resistor sheet. When the core column is applied to a lightning arrester, the resistor sheet 2 is used to realize the function of limiting overvoltage of the lightning arrester.

[0030] It can be seen that in the present embodiment, each resistor piece 2 is arranged in parallel in sequence, and an arc isolation mechanism is arranged between two adjacent resistor pieces 2. When any resistor piece 2 is defective and generates an arc, the two adjacent arc isolation mechanisms isolate the arc, so that the arc is placed in the gap between the resistor piece 2, the insulating tube 1 and the two arc isolation mechanisms, to avoid the arc burning the adjacent resistor pieces 2, effectively ensure that the qualified resistor piece 2 does not flash over when the surface of the defective resistor piece 2 flashes over, and can effectively suppress the arc caused by the defective resistor piece 2, to ensure that the remaining resistor pieces 2 work stably, to avoid the defective resistor piece 2 affecting the remaining qualified resistor pieces 2, to solve the problem in the prior art that the surface flashover of the defective resistor piece is easy to burn the adjacent qualified resistor piece, the core column has a simple structure and is easy to implement. When the core column is applied to the arrester, it can effectively avoid the arrester from failing and reduce the failure rate of the arrester.

[0031] See also Figure 1 to Figure 2 In the above embodiment, each arc isolation mechanism is an arc isolation pad 3 with a preset thickness, and each arc isolation pad 3 is sandwiched between two adjacent resistor sheets 2. Specifically, the arc isolation pad 3 is made of metal, and the preset thickness can be determined according to actual conditions, and this embodiment does not impose any limitation on this.

[0032] The size of each arc-isolating pad 3 is the same as that of each resistor piece 2. Specifically, the size of each resistor piece 2 is the same, the cross section of each arc-isolating pad 3 is circular, and the outer diameter of each arc-isolating pad 3 is equal to the outer diameter of each resistor piece 2. In addition, each arc-isolating pad 3 is aligned with each resistor piece 2.

[0033] Each arc-isolating pad 3 is provided with a protrusion 5 along the circumferential direction, and the protrusion 5 extends toward the inner wall of the insulating tube 1, and the protrusion 5 is used to block the arc. Specifically, the protrusion 5 is annular, and the protrusion 5 is a circle of the outer circumferential wall of the arc-isolating pad 3 protruding outward, so the protrusions 5 of two adjacent arc-isolating pads 3 block the gap between the resistor sheet 2 and the insulating tube 1, thereby blocking the arc.

[0034] It can be seen that in this embodiment, each arc isolation mechanism has a simple structure and is easy to implement, and the raised portion 5 of each arc isolation pad 3 blocks the arc generated by the defective resistor 2 to prevent the arc from burning the adjacent qualified resistor 2.

[0035] See also Figure 2 , this embodiment shows an implementation of an insulating cylinder. As shown in the figure, the insulating cylinder 1 is integrally formed, and each resistor 2 and each arc-isolating pad 3 are arranged in parallel in sequence to form a whole, and the whole is placed inside the insulating cylinder 1. There is a first preset distance between the outer peripheral wall of each protrusion 5 and the inner wall of the insulating cylinder 1. The first preset distance can be determined according to actual conditions, and this embodiment does not impose any restrictions on this. Specifically, each protrusion 5 is in a circular ring shape, and the difference between the outer diameter of each protrusion 5 and the inner diameter of the insulating cylinder 1 is less than or equal to 4mm.

[0036] During specific implementation, the diameter of the arc isolation pad 3 is 158 mm.

[0037] See also Figure 1 In this embodiment, another implementation of the insulation cylinder is shown. As shown in the figure, the insulation cylinder 1 includes: a plurality of connecting sections 4. Each connecting section 4 is annular, and each connecting section 4 can be detachably connected in sequence. Specifically, each connecting section 4 is annular.

[0038] The inner wall of the insulating tube 1 is provided with a plurality of accommodating grooves, each of which is arranged in sequence along the height direction of the insulating tube 1, each of which is annular, and each of which is recessed toward the outer wall of the insulating tube 1. The outer peripheral wall of each protrusion 5 is provided with a clamping portion 6, and the clamping portion 6 is arranged along the outer peripheral wall of the protrusion 5 in a circle, so that the clamping portion 6 is annular, and the clamping portion 6 extends toward the inner wall of the insulating tube 1. Each clamping portion 6 is clamped in a accommodating groove. Specifically, the number of accommodating grooves can be determined according to actual conditions, and this embodiment does not impose any restrictions on this. Preferably, the number of each clamping portion 6 is the same as that of each accommodating groove and corresponds one to one, and each clamping portion 6 is clamped in the corresponding accommodating groove.

[0039] It can be seen that in the present embodiment, the connecting sections 4 of the insulating tube 1 can be detachably connected in sequence, which is convenient for installation and disassembly, and each protrusion 5 is provided with a clamping portion 6 extending outward, and each clamping portion 6 is clamped in a receiving groove on the inner wall of the insulating tube 1, which can not only clamp and fix each arc isolation pad 3, but also effectively block the arc and prevent the arc from burning the qualified resistor 2.

[0040] Continue to see Figure 1 In the above embodiment, each arc isolation pad 3 corresponds to the connection between two adjacent connection segments 4, and each accommodating groove is provided on the inner wall of the connection between two adjacent connection segments 4. Specifically, a accommodating groove is provided at the connection between any two adjacent connection segments 4.

[0041] Each connecting section 4 may include: a body 41, a first extension portion 42, and a second extension portion 43. The body 41, the first extension portion 42, and the second extension portion 43 are all annular. The wall thickness of the body 41 is greater than the wall thickness of the first extension portion 42, and the wall thickness of the body 41 is greater than the wall thickness of the second extension portion 43. The wall thickness refers to Figure 1 Preferably, the sum of the wall thickness of the first extension portion 42 and the wall thickness of the second extension portion 43 is equal to the wall thickness of the body 41 .

[0042] The first extension portion 42 is disposed on the top surface of the main body 41 ( Figure 1 The outer peripheral wall of the first extension portion 42 is aligned with the outer peripheral wall of the body 41. The second extension portion 43 is disposed on the bottom surface of the body 41 ( Figure 1 As shown below), and the inner peripheral wall of the second extension portion 43 is aligned with the inner peripheral wall of the body 41. Specifically, Figure 1 The left side is the outside and the right side is the inside, then the outer peripheral wall of the first extension part 42 refers to the outside of the first extension part 42, the inner peripheral wall of the second extension part 43 refers to the inside of the second extension part 43, the outer peripheral wall of the body 41 refers to the outside of the body 41, and the inner peripheral wall of the body 41 refers to the inside of the body 41. The first extension part 42 and the second extension part 43 are respectively placed on the upper and lower sides of the body 41, and the first extension part 42 and the second extension part 43 are staggered.

[0043] The second extension portion 43 of each connecting segment 4 is aligned with the first extension portion 42 of the adjacent connecting segment 4, the outer peripheral wall of the second extension portion 43 is in contact with the inner peripheral wall of the first extension portion 42 of the adjacent connecting segment 4, and the end of the first extension portion 42 is in contact with the body 41 of the adjacent connecting segment 4. A second preset distance is provided between the second extension portion 43 of each connecting segment 4 and the top surface of the body 41 of the adjacent connecting segment 4 to form a receiving groove. Specifically, the length of the second extension portion 43 of each connecting segment 4 is less than the length of the first extension portion 42, so that when the end of the first extension portion 42 is in contact with the body 41, the space between the end of the second extension portion 43 and the body 41 forms a receiving groove.

[0044] During specific implementation, the second preset distance may be determined according to actual conditions, and this embodiment does not impose any limitation on this.

[0045] Preferably, the main body 41 , the first extension portion 42 and the second extension portion 43 are integrally formed.

[0046] It can be seen that in this embodiment, the outer diameter of the engaging portion 6 of each arc-isolating pad 3 is larger than the inner diameter of the insulating tube 1 to ensure reliable arc sealing, and the outer diameter of the engaging portion 6 of each arc-isolating pad 3 is smaller than the outer diameter of the insulating tube 1 to ensure that the arc-isolating pad 3 is not exposed. The structure of each connecting segment 4 is simple and easy to implement, and each connecting segment 4 is staggered and contacted in sequence to form the insulating tube 1.

[0047] See also Figure 1 and Figure 2 In the above embodiments, the insulation tube 1 is provided with a plurality of pressure release holes 11 along the height direction. When the insulation tube 1 includes a plurality of connecting sections 4, each connecting section 4 is provided with a pressure release hole 11.

[0048] In a specific implementation, the diameter of each pressure release hole 11 is greater than or equal to 5 mm and less than or equal to 20 mm.

[0049] To sum up, in this embodiment, each resistor piece 2 is arranged in parallel in sequence, and an arc isolation mechanism is arranged between two adjacent resistor pieces 2. When any resistor piece 2 is defective and generates an arc, the two adjacent arc isolation mechanisms isolate the arc, so that the arc is placed in the gap between the resistor piece 2, the insulating tube 1 and the two arc isolation mechanisms, so as to avoid the arc burning the adjacent resistor pieces 2, effectively ensuring that the qualified resistor piece 2 does not flash over when the surface of the defective resistor piece 2 flashes over, and can effectively suppress the arc caused by the defective resistor piece 2, so as to ensure the stable operation of the remaining resistor pieces 2. The core column has a simple structure and is easy to implement. When the core column is applied to the lightning arrester, it can effectively avoid the failure of the lightning arrester and reduce the failure rate of the lightning arrester.

[0050] Core embodiment:

[0051] This embodiment also proposes a core body, see Figure 3 and Figure 4 The core body comprises: a plurality of epoxy rods 7, a cover body 8, a base 9 and any of the above-mentioned core columns. The cover body 8 is arranged on the top of the core column, the base 9 is arranged on the bottom of the core column, and each epoxy rod 7 is arranged between the cover body 8 and the base 9 at intervals along the circumference of the core column. Specifically, a connecting piece is arranged between the bottom of the core column and the base 9, and the cover body 8 and the base 9 clamp the core column.

[0052] The specific implementation process of the core column can be found in the above description, and will not be described in detail in this embodiment.

[0053] Since the core column has the above-mentioned effects, the core body having the core column also has corresponding technical effects.

[0054] Lightning arrester embodiment:

[0055] This embodiment also proposes a lightning arrester, see Figure 3 and Figure 4 The arrester comprises: a composite outer jacket 10 and any one of the above cores. The core is arranged inside the composite outer jacket 10.

[0056] The specific implementation process of the core body can be found in the above description, and this embodiment will not be repeated here.

[0057] Since the core has the above-mentioned effects, the lightning arrester having the core also has corresponding technical effects.

[0058] It should be noted that the principles of the core column, core body and lightning arrester in the present invention are the same, and the relevant parts can be referenced to each other.

[0059] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0060] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A core column, characterized in that: include: An insulating cylinder (1), a plurality of resistor sheets (2) and a plurality of arc-isolating mechanisms; wherein: Each of the resistor sheets (2) is arranged in the insulating cylinder (1), and each of the resistor sheets (2) is arranged in parallel in sequence along the height direction of the insulating cylinder (1), and a preset gap is provided between the outer peripheral wall of each of the resistor sheets (2) and the inner wall of the insulating cylinder (1); An arc isolation mechanism is provided between any two adjacent resistor sheets (2), and each arc isolation mechanism is used to isolate the arc when the resistor sheet (2) generates an arc; Each of the arc-isolating mechanisms is an arc-isolating pad (3) having a preset thickness, and each of the arc-isolating pads (3) is sandwiched between two adjacent resistor sheets (2); The size of each arc-isolating pad (3) is the same as the size of each resistor sheet (2), and each arc-isolating pad (3) is provided with a protrusion (5) extending toward the inner wall of the insulating cylinder (1) along the circumferential direction to block the arc; The insulating tube (1) is integrally formed, and a first preset distance exists between the outer peripheral wall of each protrusion (5) and the inner wall of the insulating tube (1); or, The insulating cylinder (1) comprises: a plurality of annular connecting sections (4), each of the connecting sections (4) being detachably connected in sequence; The inner wall of the insulating cylinder (1) is provided with a plurality of accommodating grooves, the outer peripheral wall of each of the protruding portions (5) is provided with a clamping portion (6) extending toward the inner wall of the insulating cylinder (1), and each of the clamping portions (6) is clamped in a accommodating groove.

2. The stem according to claim 1, characterized in that: Each of the arc isolation pads (3) corresponds to the connection between two adjacent connection sections (4), and each of the accommodating grooves is opened on the inner wall of the connection between two adjacent connection sections (4).

3. The stem according to claim 1 or 2, characterized in that: Each of the connecting sections (4) comprises: a body (41) all in an annular shape, a first extending portion (42) and a second extending portion (43); wherein: The wall thickness of the main body (41) is greater than the wall thickness of the first extension portion (42) and the wall thickness of the second extension portion (43); The first extension portion (42) is arranged on the top surface of the main body (41), and the outer peripheral wall of the first extension portion (42) is aligned with the outer peripheral wall of the main body (41); The second extension portion (43) is arranged on the bottom surface of the main body (41), and the inner peripheral wall of the second extension portion (43) is aligned with the inner peripheral wall of the main body (41); The second extension portion (43) of each connecting segment (4) is aligned with the first extension portion (42) of an adjacent connecting segment (4), and a second preset distance is provided between the second extension portion (43) of each connecting segment (4) and the top surface of the body (41) of the adjacent connecting segment (4) to form the accommodation groove.

4. The stem according to claim 3, characterized in that: The sum of the wall thickness of the first extension portion (42) and the wall thickness of the second extension portion (43) is equal to the wall thickness of the body (41).

5. The stem according to claim 1, characterized in that: The insulating cylinder (1) is provided with a plurality of pressure release holes (11) along the height direction.

6. A core, characterized in that: include: A plurality of epoxy rods (7), a cover (8), a base (9) and a core column as claimed in any one of claims 1 to 5; wherein, The cover (8) is arranged at the top of the core column, the base (9) is arranged at the bottom of the core column, and each of the epoxy rods (7) is arranged between the cover (8) and the base (9) at intervals along the circumference of the core column.

7. A lightning arrester, characterized in that: include: A composite jacket (10) and a core as claimed in claim 6; wherein: The core is arranged inside the composite outer shell (10).

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