JP2016076672A - Arrestor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arrestor which can prevent intrusion of a coating part into a gap between nonlinear resistive elements, by a simple structure.SOLUTION: An arrestor includes a plurality of laminated nonlinear resistor elements 25, a pair of terminal electrodes arranged at both ends of the nonlinear resistor elements 25 in the lamination direction, a coating part formed by coating the periphery of the nonlinear resistor elements with an insulating material, and a foil 28 made of a conductive material and sandwiched between adjoining nonlinear resistor elements 25.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lightning arrester.

  Conventionally, in a lightning arrester, a plurality of non-linear resistance elements stacked, a pair of terminal electrodes arranged on both sides in the stacking direction of the non-linear resistance elements, and an insulating resin covering the outer periphery of the non-linear resistance elements The thing provided with the coating | coated part of this is known (for example, refer patent document 1 and patent document 2). In such a lightning arrester, there is a problem that the resin material may enter a gap between the stacked non-linear resistance elements when the covering portion made of the resin material is molded. On the other hand, in patent document 1, in order to cover the laminated non-linear resistance element with a heat-shrinkable tube (first covering portion), the covering portion provided outside the heat-shrinkable tube has a gap between the non-linear resistance elements. Hard to penetrate. Moreover, in patent document 2, the surface of the laminated non-linear resistance element is covered with a first resin-coated portion under normal pressure, and the first coated portion is covered with a second resin-coated portion in a vacuum mold. Since it coat | covers with, it can suppress that resin penetrate | invades in the clearance gap between non-linear resistance elements.

Japanese Patent Application Laid-Open No. 07-296657 JP 2012-99615 A

However, in the configurations of Patent Document 1 and Patent Document 2, since the second covering portion is provided outside the first covering portion, there is a problem that the manufacturing process and the number of parts increase.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the lightning arrester which can prevent the penetration | invasion to the clearance gap between the non-linear resistance elements of a coating | coated part with a simple structure.

In order to achieve the above object, the present invention provides a plurality of stacked non-linear resistance elements, a pair of terminal electrodes disposed at both ends of the non-linear resistance elements in the stacking direction, and the periphery of the non-linear resistance elements. Provided is a lightning arrester comprising: a covering portion formed by covering with an insulating material; and a conductive material foil sandwiched between adjacent non-linear resistance elements.
According to the present invention, since the lightning arrester includes the foil made of the conductive material sandwiched between the adjacent non-linear resistance elements, the conductivity between the non-linear resistance elements is secured by the foil. Can be filled with foil. For this reason, it can prevent with a simple structure that a coating | coated part penetrate | invades into the clearance gap between nonlinear resistance elements.

Further, the present invention is characterized in that a length adjusting spacer is provided so as to overlap the non-linear resistance element, and the foil is provided between the spacer and the non-linear resistance element.
According to the present invention, the spacer for adjusting the length arranged to overlap the non-linear resistance element is provided, and the foil is provided between the spacer and the non-linear resistance element. Can be filled with foil. For this reason, it can prevent with a simple structure that a coating | coated part penetrate | invades into the clearance gap between a non-linear resistance element and a spacer.
Further, the present invention is characterized in that a plurality of the spacers are provided so as to overlap each other, and the foil is provided between the spacers.
According to the present invention, a plurality of spacers are provided in a stacked manner, and a foil is provided between the spacers, so that the gap between the spacers can be filled with the foil. For this reason, it can prevent with a simple structure that a coating | coated part penetrate | invades into the clearance gap between spacers.

Furthermore, the present invention is characterized by comprising an elastic member that compresses the non-linear resistance element in the stacking direction between the pair of terminal electrodes.
According to the present invention, since the lightning arrester includes the elastic member that compresses the non-linear resistance element in the stacking direction, it can be brought into close contact with the surface by crushing the foil by the compressive force of the elastic member. For this reason, the gap can be effectively filled with foil.
Further, according to the present invention, the non-linear resistance element includes a conductive vapor deposition layer on an end face in the stacking direction, and the foil is provided between the vapor deposition layer forming surfaces of the non-linear resistance element, The thickness dimension of foil is larger than the thickness dimension of the said vapor deposition layer, It is characterized by the above-mentioned.
According to the present invention, the foil is provided between the conductive vapor deposition layer forming surfaces of the non-linear resistance element, and the thickness dimension of the foil is larger than the thickness dimension of the vapor deposition layer. A large amount can be secured, and the foil can be adhered to the vapor deposition layer. For this reason, the gap can be effectively filled with foil.

Further, according to the present invention, the foil has a protruding portion that protrudes outward from between the non-linear resistance elements, and the protruding length of the protruding portion is the length of one non-linear resistance element in the stacking direction. It is characterized by being 20% or less.
According to the present invention, since the protruding length of the protruding portion of the foil is 20% or less of the length of one non-linear resistance element in the stacking direction, even if the protruding portion is present, Appropriate insulation characteristics can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, the lightning arrester which can prevent the penetration | invasion to the clearance gap between the non-linear resistance elements of a coating | coated part with a simple structure can be provided.

It is a figure which shows the lightning arrester which concerns on embodiment of this invention. It is a figure which shows the structure of an element part. It is a figure which shows the state which one part of foil protruded outside.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a lightning arrester according to an embodiment of the present invention.
The lightning arrester 10 is provided, for example, in an insulator device that supports electric wires installed between steel towers in an insulated state on the steel tower. The lightning arrester 10 prevents a power failure by discharging between the arc horn and passing only the current of the lightning during a lightning strike, and interrupting the continuity.

  As shown in FIG. 1, the lightning arrester 10 surrounds the element part 11 from the circumference | surroundings with the cylindrical element part 11, a pair of terminal electrodes 12 and 13 arrange | positioned at the both ends of the axial direction of the element part 11, respectively. And a plurality of insulating rods 14 arranged to couple the pair of terminal electrodes 12 and 13 in the axial direction. Further, the lightning arrester 10 includes a spring portion 15 (elastic member) interposed between the element portion 11 and one terminal electrode 12, an element portion 11, an insulating rod 14, and a pair of terminal electrodes 12, 13 from the outside. And a covering portion 16 for covering. In FIG. 1, the internal structure of the lightning arrester 10 is indicated by a solid line, and the covering portion 16 is indicated by a two-dot chain line.

Each of the terminal electrodes 12 and 13 includes a cylindrical receiving portion 17 that is formed to have a larger diameter than the element portion 11 and receives an end of the element portion 11, and an attachment portion 18 that extends from the receiving portion 17 in the axial direction. For example, a mounting bracket (not shown) attached to the insulator side is connected to one side of the mounting part 18, and a discharge part (not shown) that discharges with the arc horn is connected to the other side of the mounting part 18. The
Each insulating rod 14 is made of a material having electrical insulation. The insulating rods 14 are arranged substantially in parallel with the element portion 11 and arranged in an annular arrangement at substantially equal intervals in the circumferential direction, and the element portions 11 are accommodated in spaces inside the plurality of insulating rods 14. The

The spring portion 15 includes a metal spring provided in a compressed state between the element portion 11 and one terminal electrode 12.
The coating | coated part 16 is comprised with the resin material provided with electrical insulation. The covering portion 16 is made of, for example, silicone rubber. The covering portion 16 covers the entire outer peripheral surface of the element portion 11 in the axial direction, and both end portions of the covering portion 16 cover the outer peripheral surface of the receiving portion 17 of the terminal electrodes 12 and 13.
The covering portion 16 includes a cylindrical portion 19 that covers the insulating rod 14, the element portion 11, and the like, and a disk-shaped fold portion 20 that protrudes in the radial direction from the outer peripheral surface of the cylindrical portion 19. A plurality of pleat portions 20 are provided at substantially equal intervals in the axial direction of the cylindrical portion 19. The covering portion 16 is formed by directly molding a resin material on the outer peripheral surface of the element portion 11.

FIG. 2 is a diagram illustrating a configuration of the element unit 11.
The element unit 11 includes a plurality of non-linear resistance elements 25 stacked in the axial direction and a length adjusting spacer 26 stacked on the non-linear resistance elements 25. Since the spacers 26 are provided for adjusting the length of the element portion 11, the spacers 26 are provided as zero, one, or a plurality as necessary.
The non-linear resistance element 25 is an element having a characteristic that the electric resistance greatly decreases as the voltage increases. In other words, the non-linear resistance element 25 is connected to the object to be mounted, and when the voltage is small, only a very small current normally flows and the leakage current is small. However, when a high voltage is applied due to a surge, the non-linear resistance element 25 has an electric resistance. A large current drops and a large current flows.

The non-linear resistance element 25 is, for example, a ceramic sintered body mainly composed of zinc oxide (ZnO). Each non-linear resistance element 25 is formed in a cylindrical shape, and an aluminum vapor deposition layer 27 is formed on both end faces in the axial direction of the non-linear resistance element 25 in order to impart conductivity. That is, the non-linear resistance element 25 includes a deposited layer forming surface on both end surfaces in the stacking direction. The non-linear resistance elements 25 have the same outer diameter and axial length. A plurality of non-linear resistance elements 25 are laminated in the axial direction in order to be restricted in size so that a uniform structure can be obtained by sintering.
The spacer 26 is a disk-shaped thin plate formed to have substantially the same diameter as the outer diameter of the non-linear resistance element 25. The spacer 26 is made of the same material as the vapor deposition layer 27 and is made of aluminum.

The element unit 11 includes a foil 28 provided in a gap between adjacent non-linear resistance elements 25 and 25, a foil 29 provided in a gap between the non-linear resistance element 25 and the spacer 26, and an adjacent spacer. 26 and 26, and a foil 30 provided in the gap between the element portions 11 and the spring portion 15 is provided. The foils 28, 29, 30 and 31 are made of a conductive metal material and are made of the same material as the vapor deposition layer 27. That is, the foils 28, 29, 30, and 31 are aluminum foils, which are the same parts.
The thickness of the foils 28, 29, 30, and 31 is larger than the thickness of the vapor deposition layer 27, for example, 0.02 mm. The foils 28, 29, 30, and 31 are substantially circular foils in a plan view formed to have substantially the same diameter as the outer diameter of the non-linear resistance element 25. The foil 28 is sandwiched between the vapor deposition layer forming surfaces of the non-linear resistance elements 25 and 25 when the non-linear resistance elements 25 are stacked. That is, the foil 28 is provided between the vapor deposition layers 27 and 27 of the adjacent non-linear resistance elements 25 and 25.

The foil 28 is sandwiched between the non-linear resistance elements 25 and 25, thereby deforming along the surface of the vapor deposition layer 27 and closing the gap between the non-linear resistance elements 25 and 25. The thickness of the aluminum vapor deposition layer 27 is not completely uniform, and fine irregularities are present on the surface of the vapor deposition layer 27. As in the present embodiment, a foil is provided between the vapor deposition layers 27 and 27. By providing 28, the clearance gap between the vapor deposition layers 27 and 27 can be filled effectively, and it can prevent that the coating | coated part 16 penetrate | invades into a clearance gap. Furthermore, since the foil 28 is compressed between the vapor deposition layers 27 and 27 by the preset load of the spring portion 15 arranged in a compressed state, the foil 28 is effectively brought into close contact with the vapor deposition layers 27 and 27 to form a gap. Can be blocked.
Similarly, the foils 29, 30, and 31 are sandwiched between the non-linear resistance element 25 and the spacer 26, between the spacers 26 and 26, and between the element portion 11 and the spring portion 15, respectively. Then, it deforms along the surface of the non-linear resistance element 25, the surface of the spacer 26, and the surface of the connecting member 21 to fill the gap. This prevents the covering portion 16 from entering the gap.

FIG. 3 is a diagram illustrating a state in which a part of the foil 28 protrudes outward.
As shown in FIG. 3, the foil 28 may have a protruding portion 32 that protrudes from between the non-linear resistance elements 25, 25 due to errors during assembly and manufacturing.
The present inventors examined the influence of the protruding portion 32 on the leakage current and the operation start voltage by experiments. Here, the operation start voltage is a voltage at which the non-linear resistance element 25 starts to flow a large current as the electric resistance of the non-linear resistance element 25 is greatly reduced as the voltage increases. In this experiment, a test lightning arrester is formed by molding the covering portion 16 in a state where the protruding portion 32 exists on one end side of the single non-linear resistance element 25 and the protruding portion 32 does not exist on the other end side. 10 was performed. In this lightning arrester 10 for testing, the protruding portion 32 exists between the covering portion 16 and the outer peripheral surface of the non-linear resistance element 25.

  As a result, if the protruding length L1 in the axial direction of the protruding portion 32 is 20% or less of the length L in the stacking direction of the single nonlinear resistance element 25, the leakage current affects the performance of the lightning arrester 10. It has become clear that the operation start voltage does not increase so much and the operation start voltage does not decrease so much that the performance of the lightning arrester 10 is affected. That is, including the state where the protruding portion 32 exists at both ends of the single non-linear resistance element 25, even if the protruding portion 32 exists, the distance between the adjacent foils 28, 28 is a single non-linear. If the linear resistance element 25 is 80% or more of the total length in the axial direction, the performance of the lightning arrester 10 is satisfied.

Here, the manufacturing process of the lightning arrester 10 will be described.
First, the non-linear resistance element 25, the spacer 26, and the foils 28, 29, 30, and 31 are laminated to form the element portion 11, and the element portion 11 is disposed inside the insulating rod 14 assembled to the terminal electrode 13. Provided in space. Next, the connecting member 21 and the spring portion 15 are disposed between the element portion 11 and the terminal electrode 12, and the terminal electrode 12 is coupled to the insulating rod 14, thereby forming a small assembly. In the state of the small assembly, the spring portion 15 is provided in a compressed state, so that a preset load is applied.

Next, the small assembly is set in a mold having a shape for forming the covering portion 16, and after the liquid resin is injected into the mold, the resin is solidified, whereby the outer periphery of the small assembly is obtained. The covering portion 16 is integrally formed on the surface. The mold is preheated at the time of injecting resin, and the inside is in a vacuum state.
In the present embodiment, a gap between adjacent non-linear resistance elements 25, 25, a gap between non-linear resistance element 25 and spacer 26, a gap between adjacent spacers 26, 26, and element unit 11 Since the foils 28, 29, 30, 31 are provided between the connecting member 21 and the gap, the gap is closed, so that when the resin is molded, the resin can be effectively prevented from entering the gap. . Thereby, since the reduction | decrease of the area of the conduction | electrical_connection part by the insulating resin penetrate | invading into a clearance gap can be prevented, the lightning arrester provided with the favorable characteristic can be obtained.

  As described above, according to the embodiment to which the present invention is applied, the lightning arrester 10 includes a plurality of stacked non-linear resistance elements 25 and a pair of non-linear resistance elements 25 disposed at both ends in the stacking direction. The terminal electrodes 12, 13, the covering portion 16 formed by covering the periphery of the non-linear resistance element 25 with an insulating material, and the conductive material foil 28 sandwiched between the adjacent non-linear resistance elements 25, 25. Therefore, the gap between the non-linear resistance elements 25 and 25 can be filled with the foil 28 while ensuring the conductivity between the non-linear resistance elements 25 and 25 by the foil 28. For this reason, it is possible to prevent the foil 28 from entering the gap between the non-linear resistance elements 25 and 25 with a simple structure.

In addition, since the spacer 26 for adjusting the length is provided so as to overlap the non-linear resistance element 25 and the foil 29 is provided between the spacer 26 and the non-linear resistance element 25, the non-linear resistance element 25 and the spacer 26 are provided. Can be filled with the foil 29. For this reason, it can prevent with the simple structure that the coating | coated part 16 penetrate | invades in the clearance gap between the non-linear resistance element 25 and the spacer 26. FIG.
In addition, a plurality of spacers 26 are provided in a stacked manner, and the foil 30 is provided between the spacers 26, 26, so that the gap between the spacers 26, 26 can be filled with the foil 30. For this reason, it can prevent with the simple structure that the coating | coated part 16 penetrate | invades in the clearance gap between spacers 26 and 26. FIG.

Furthermore, since the lightning arrester 10 includes the spring portion 15 that compresses the non-linear resistance element 25 in the stacking direction between the pair of terminal electrodes 12 and 13, the foils 28, 29, and 30 are crushed by the compressive force of the spring portion 15. Can be brought into close contact with the surface. For this reason, the gap can be effectively filled with the foils 28, 29 and 30.
In addition, the non-linear resistance element 25 includes a conductive vapor deposition layer 27 on the end face in the stacking direction, and the foil 28 is provided between the vapor deposition layer forming surfaces of the non-linear resistance element 25, and the thickness of the foil 28. Since the dimension is larger than the thickness dimension of the vapor deposition layer 27, a large deformation amount of the foil 28 can be secured, and the foil 28 can be adhered to the vapor deposition layer 27. For this reason, the gap can be effectively filled with the foil 28.

  The foil 28 has a protruding portion 32 that protrudes outward from between the non-linear resistance elements 25, 25, and the protruding length L 1 of the protruding portion 32 is a length L in the stacking direction of one non-linear resistance element 25. Therefore, even if the protruding portion 32 exists, appropriate insulation characteristics of the lightning arrester 10 can be obtained. For this reason, management of the dimensional accuracy of the foil 28 and the assembly accuracy of the small assembly is easy.

In addition, the said embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said embodiment.
In the said embodiment, although foil 28, 29, 30, 31 was demonstrated as what is an aluminum foil, this invention is not limited to this. The foils 28, 29, 30 and 31 may be made of a material having conductivity, and are preferably made of the same material as the vapor deposition layer 27. Moreover, as aluminum which comprises foil 28,29,30,31, pure aluminum or an aluminum alloy can be used.

10 Lightning Arrester 12, 13 Terminal Electrode 15 Spring Part (Elastic Member)
16 Covering portion 25 Non-linear resistance element 26 Spacer 27 Deposition layer 28, 29, 30 Foil 32 Protruding portion L1 Protruding length

Claims (6)

  A plurality of non-linear resistance elements stacked, a pair of terminal electrodes disposed at both ends of the non-linear resistance element in the stacking direction, and a coating formed by covering the periphery of the non-linear resistance element with an insulating material A lightning arrester comprising: a portion and a foil made of a conductive material sandwiched between the adjacent non-linear resistance elements.   2. The lightning arrester according to claim 1, further comprising a spacer for adjusting a length arranged to overlap the non-linear resistance element, wherein the foil is provided between the spacer and the non-linear resistance element.   The lightning arrester according to claim 2, wherein a plurality of the spacers are provided so as to overlap each other, and the foil is provided between the spacers.   The lightning arrester according to claim 1, further comprising an elastic member that compresses the non-linear resistance element in the stacking direction between the pair of terminal electrodes.   The non-linear resistance element includes a conductive vapor deposition layer on an end surface in the stacking direction, the foil is provided between vapor deposition layer forming surfaces of the non-linear resistance element, and the thickness dimension of the foil is The lightning arrester according to any one of claims 1 to 4, wherein the arrester is larger than a thickness dimension of the vapor deposition layer.   The foil has a protruding portion that protrudes outward from between the non-linear resistance elements, and the protruding length of the protruding portion is 20% or less of the length of one non-linear resistance element in the stacking direction. The lightning arrester according to any one of claims 1 to 5.

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