JP2501618Y2 - Lightning arrester - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a lightning arrester designed to be lightweight and to prevent scattering at the time of destruction.

B. Outline of the Invention The present invention relates to a lightning arrester configured by stacking elements inside a container. A rubber-type polymer material is provided on the inner and outer peripheral surfaces of a glass fiber reinforced epoxy pipe to form a container, and the outer periphery between the elements is formed. By accommodating the element group configured by covering the surface with an insulating material in the container without forming a space between the element and the container, the lightning arrester was lightened and the container was prevented from breaking and scattering due to explosion. It is a thing.

C. Conventional Technology A lightning arrester is conventionally configured as shown in FIG.

As shown in the figure, an element group 3 formed by stacking elements 2 is housed inside a substantially cylindrical container 1 having a plurality of folds 1a on its outer peripheral surface, and the container 1 is fixed to both ends of the container 1. A press plate 5 and a pressure release plate presser 6 are attached via the flange 4. The pressure plate 5 and the pressure release plate retainer 6 have pressure release holes (not shown), and a thin pressure release plate that closes the pressure release holes is sandwiched between these to hold the inside of the container 1 airtight. The element group 3 in the container 1 is
It is supported on the lower holding plate 5 through a hollow distance 8, and is held by a spring 9 provided between the upper holding plate 5 and the element group 3.

As the container 1 used in such a lightning arrester, a porcelain material that is not exposed to the outdoors directly and is not deteriorated electrically or mechanically is used as an insulating material.

D. Problems to be solved by the device However, such a lightning arrester has the following problems.

Since the porcelain used as a container has a large specific gravity, the strength of the steel tower on which the lightning arrester is mounted is limited, which hinders the downsizing of the steel tower. In addition, since porcelain is hard and brittle, it occurs when the folds of the container are broken and dropped from the tower by the impact force of electric energy during an air flash on the outer peripheral surface of the container, or when an excessive lightning surge is absorbed. The inert gas in the container expands and explodes due to penetration of the element or flashing outside the element. Even with a pressure relief plate, the container often cracks due to the impact force of an explosion.

Then, this invention aims at providing the lightning arrester which solved such a subject.

E. Means for Solving the Problems The constitution of the present invention for achieving such an object is such that a rubber-type polymer potting material is provided on the inner peripheral surface of a glass fiber reinforced epoxy pipe, while ethylene A substantially cylindrical container is formed by providing and integrating a propylene / terpolymer, and an element group formed by covering the outer peripheral surface between the laminated elements with an insulating material is formed between the inner peripheral surface of the container and the element group. It is characterized in that metal fittings that are housed in the container without forming a space therein and that abut against the element are provided at both ends of the container.

F. Action The lightning arrester is lightened because the container that houses the element is made of rubber-based polymer material, and because it is rubber-based, it is flexible and will not break and scatter during a flashover. Also,
Since the rubber-based polymer potting material is used as the rubber-based polymer material inside the container, waterproof treatment is performed between the glass fiber reinforced epoxy pipe and the element group, and the element in the dew condensation state and the glass fiber reinforced epoxy pipe The creepage flashover value is prevented from decreasing, the elements are prevented from scattering during overvoltage withstand voltage, and the explosion is suppressed.

On the other hand, in order to manufacture a lightning arrester, put the element group in a glass fiber reinforced epoxy pipe, and provide ethylene / propylene / terpolymer by injection molding on the outside of the pipe,
Inside the pipe, instead of injection molding, a rubber polymer potting material is filled between the pipe and the element group.

Since the outer peripheral surface between the elements in the element group in which the elements are laminated is covered with the insulating material, even if the rubber-based polymer potting material is filled between the element group and the pipe, the rubber-based polymer potting material is provided between the elements. It does not cause insulation failure due to penetration.

G. Embodiment Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

As shown in FIG. 1, the outer peripheral surface of a glass fiber reinforced epoxy pipe (hereinafter, simply referred to as a pipe) 10 is injection-molded to form an ethylene / propylene / terpolymer (hereinafter simply referred to as EP).
A rubber-type polymer potting material 13 is filled between the pipe 10 and the element group in which the element 2 is integrated with the heat-shrinkable tube 15 and the pipe 10 and EPDM 11 and the rubber-type polymer potting material 13 are formed. The container 14 is formed by integrating and
The element 2 is stacked and accommodated in the container 14 without forming a space with the container 14. Further, metal fittings 12 that come into contact with the element 2 are provided above and below the container 14. The elements 2 are laminated and their outer peripheral surfaces are covered with a heat-resistant heat-shrinkable tube 15 as an insulating material.

The glass fiber reinforced epoxy pipe 10 is provided for the purpose of ensuring the mechanical strength and insulation of the container 14, reducing the weight of the container, preventing the container from scattering during an internal explosion, and holding the metal fitting 12.

On the other hand, as the EPDM11, in order to reduce the weight of the container 14, a polymer material having a specific gravity of 1.0 to 1.8 smaller than the specific gravity of porcelain of 2.3 to 4 and a composite material obtained by adding an inorganic filler to the polymer material are used. From the viewpoint of preventing cracks and scattering, we selected flexible rubber-based polymer materials and rubber-based composite materials among polymer materials. Furthermore, the types of rubber-based polymer materials have good weather resistance and insulation properties, and are comprehensive. There are three types of materials that are excellent in outdoor exposure and electricity charging, EPDM, silicone rubber, and fluorine rubber, but here the raw material price is low and the dimensional stability of the pleated shape, reproducibility, large-sized formability, and metal fittings. EPDM is used as the material because of its adhesiveness with 12 and pipe 10.

The heat shrink tube is made of the same material as self-fusing type silicone rubber or EPDM. As the insulating material, a heat-resistant tape made of the same material as these may be used.

The lightning arrester is manufactured as follows.
The outer peripheral surface of the pipe 10 is shot or sandblasted in order to improve the adhesiveness, and the element 2, the pipe 10, and the pipe 10 are placed in the mold so that the gap between the pipe 10 and the element 2 is minimized.
Set the upper and lower brackets 12. At this time, a plurality of elements 2 are laminated and then covered with a heat-shrinkable tube 15 to be heat-shrinked to form an integrated element group, which is set in the pipe 10 in the form of an element group. Then, the EPDM 11 is injection-molded only on the outside of the pipe 10. Then, a heat-crosslinking type rubber-based polymer potting material 13 having a low viscosity is injected between the metal fitting 12, the pipe 10 and the element group. The injection into the pipe 10 is performed through a hole (not shown) formed in the pipe 10.

Examples of the rubber-based polymer potting material 13 include liquid poly-butadiene rubber, rubber-like epoxy resin, potting-type silicone rubber, and the like. In this embodiment, the adhesiveness to the heat-shrinkable tube 15 and the pipe 10 is high. Highly liquid polybutadiene rubber or rubber-like epoxy resin with good adhesiveness and heat resistance is used.

In this way, filling the rubber-based polymer potting material 13 is to perform waterproofing between the pipe 10 and the element group, prevent the element 2 in the dew condensation state, and the reduction of the creeping flashover value of each of the pipes 10, This is to prevent scattering of the element 2 and suppression of explosion during overvoltage withstand voltage.

The container used in the present invention can be used not only for the arrester but also for insulators, spacers, bushings and the like.

H. Effect of the Invention As can be seen from the above description, the lightning arrester according to the present invention has the following effects.

Since the container is made of a rubber-based polymer material having a specific gravity smaller than that of the conventional porcelain, the lightning arrester is lightened.

Compared to the hard and brittle porcelain used in the past, the rubber polymer material is more flexible, so it is possible to prevent scattering damage when the container is flashing outside or inside, and preventing secondary disasters around the equipment. Becomes

Conventionally used porcelain has a dielectric constant of around 6, but rubber-based polymer materials have a dielectric constant of around 3, so a high creepage value per unit length can be obtained. Therefore, if the length is the same, high reliability can be realized, and if the voltage is the same, downsizing can be realized.

Since the rubber-based polymer material can be formed by injection molding or potting (casting), the number of working steps can be reduced and the manufacturing cost can be reduced.

In addition, since the inside of the pipe is filled with a rubber-based polymer potting material, the water between the pipe and the element group is waterproofed, and the drop of the creeping flash value of the element and the pipe in the dew condensation state is prevented. .

When a conventional porcelain container was used, a space filled with an inert gas was formed between the container and the element, but this invention does not form a space, so gas explosion at the time of flashover of the surface of the element is suppressed. Also, scattering and destruction of the container can be prevented. Further, since no space is formed, it is possible to prevent dew condensation on the inner surface, which has occurred conventionally, and it is not necessary to consider a complicated structure for preventing intrusion of water from the outside of the container.

Since the glass fiber reinforced epoxy pipe can have higher strength per unit thickness than porcelain, the strength of the arrester can be guaranteed even if the thickness is reduced as compared with the case of porcelain. Therefore, the lightning arrestor can be downsized and the weight can be further reduced.

Also, since the outer peripheral surface between the stacked elements is covered with an insulating material,
Even if the rubber-based polymer material is injection-molded or potted, the rubber-based polymer material does not get stuck between the elements to cause poor conduction.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a lightning arrester according to the present invention, and FIG. 2 is a sectional view showing a conventional lightning arrester. 1 ... Element, 10 ... Glass fiber reinforced epoxy pipe, 11
…… EPDM, 12 …… metal fittings, 13 …… rubber-based polymer potting material, 14 …… container, 15 …… heat-shrinkable tube.

Claims (1)

(57) [Scope of utility model registration request] 1. A glass fiber reinforced epoxy pipe is provided with a rubber-based polymeric potting material on the inner peripheral surface thereof, while an ethylene / propylene / terpolymer is provided on the outer peripheral surface thereof to form a substantially tubular shape. A metal fitting that forms a container and stores the element group formed by covering the outer peripheral surface between the stacked elements with an insulating material in the container without forming a space between the element and the inner peripheral surface of the container, and abutting the element A lightning arrester, characterized in that each is provided at both ends of the container.