JPH0441593Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a gap unit housed within an insulating container of a lightning arrester.

(Prior Art) Conventionally, this type of gap unit has been constructed by bonding and fixing discharge electrodes that close the opening of the cylinder to both end faces of a cylinder made of an insulating material, and using the gap unit as a lightning arrester. It is known that the container is housed in a lumen formed in a porcelain container.

(Problems to be Solved by the Invention) However, in the conventional gear gear unit, the cylindrical body becomes unable to cut off the follow-on current due to excessive lightning surge, and high-temperature, high-pressure gas is generated inside due to the follow-on arc. The uneven heat and pressure shock could cause the cylinder to shatter, and the porcelain container of the lightning arrester could break and fall to the ground, posing a public safety issue.

This invention was made to solve the above problems, and its purpose is to provide a gap unit for a lightning arrester that can improve the explosion-proof properties of the gap unit and the main body of the lightning arrester.

Structure of the invention (Means for solving the problem) In order to achieve the above object, this invention provides a pair of inner and outer cylinders made of insulating material, and a space between them. A configuration is adopted in which the inner cavities of both cylinders are closed at both ends of both cylinders, and discharge electrodes facing each other are bonded and fixed.

(Function) With the above configuration, in this invention, when high temperature and high pressure gas is generated in the gear unit due to a follow-on arc, the high heat and pressure shock are shielded by the inner and outer cylinders, and the lightning arrester is insulated. The impact on the container is reduced and the safety of the gap unit and insulating container is improved.

(Embodiment) Hereinafter, an embodiment embodying this invention will be described in detail with reference to the drawings.

An upper conductive unit 9, a gap unit 2, a conductive spacer 10, a nonlinear resistor unit 11, and a lower conductive unit 12 are housed in this order in a cavity 1a of an insulating container 1 made of porcelain.

Here, the gap unit 2 will be explained. As shown in Fig. 2, the gap unit 2 includes an outer cylinder 3 made of an inorganic material such as porcelain, and the inside thereof is made of heat-resistant and impact-resistant quartz glass, alumina porcelain, or sound-absorbing porous material. An inner cylinder 4 made of an inorganic material such as quality ceramics is provided. In addition, both the inner and outer cylinders 3,
A space A is provided between 4 and 4. A metal plate discharge electrode 5 consisting of a discharge end 5a and an electrode plate 5b is bonded and fixed to both upper and lower end surfaces of the outer cylinder 3 by the electrode plate 5b, and both discharge ends 5a are connected to the inner cavity of the inner cylinder 4. They are arranged facing each other with a discharge gap 〓G interposed therebetween. 5c is a gas passage notch, and the discharge end 5
This makes it easier to break the gap unit 2 due to melting and loss of the electrode plate 5a and the electrode plate 5b. Reference numeral 8 denotes a seal plug for opening and sealing when filling the gap unit 2 with an inert insulating gas or the like. In addition, an inorganic material such as low melting point glass is filled between the outer circumferential surface of the gap unit 2 and the inner circumferential surface of the cavity 1a.
Insulating layer 13 formed by heating and melting in a furnace together with
is provided. This insulating layer 13 has both 1 and 2
The gap unit 2 is quickly welded and formed in between.
Contains insulation. The conductive spacer 10 is made of a metal material formed into a columnar or cylindrical shape, and is placed between the gap unit 2 and the non-linear resistor unit 11.

The non-linear resistor unit 11 includes a non-linear resistive element mainly made of zinc oxide (ZnO),
The non-linear resistance element is connected in series with the gap unit 2 and the conductive spacer 10 through welded metal electrodes, intermediate electrode plates, etc. at the upper and lower end surfaces thereof and between each other.

The upper and lower conductive units 9 and 12 are arranged between the cap fittings 16 and 16, which are respectively caulked to the openings at both ends of the insulating container 1, and the gap unit 2 and the non-linear resistor 11. It is composed of

Cap fittings 16 and 16 each have an O-ring 1
7 and 17 are interposed to seal the insulating container 1.

The cap fittings 16, 16 are deformed or melted and ruptured by the high temperature and high pressure gas generated within the insulating container 1, and are provided with locally thinned parts or notches so that the gas can be released. You can leave it there.

Further, a protective sheet 19 made of reinforced plastic or rubber is provided on the circumferential surface of the cavity 1a, which is enclosed by the insulating layer 13 together with the upper conductive unit 9 and the gap unit 2, and in which the conductive spacer 10 and the nonlinear resistor unit 11 are located. is arranged in a cylindrical shape.

FIGS. 3 and 4 show another embodiment of the gap unit. In FIG. 3, one electrode plate 5b is formed thickly to make it less susceptible to melting away by an arc and to accelerate the ejected gas under pressure in the opposite direction. In FIG.
b is locked to prevent the electrode plate 5b from peeling off due to thermal expansion. The cap metal fitting 16 is provided with terminal metal fittings 18, 18 for connecting lead wires or ground wires.

In the embodiment configured as described above, when a lightning surge on the line is applied to the lightning arrester between the lead wire and the ground wire, the lightning surge is discharged to the ground, suppressing the rise in electric pressure, and causing cut-out, opening and closing. This prevents line failures due to flash faults in transformers or transformers.

In this embodiment, the gap unit 2
into the cavity 1a of the insulating container 1 via the insulating layer 13
Since the gap unit 2 is sealed immediately, moisture absorption in the gap unit 2 can be prevented, and variations in discharge voltage characteristics and insulation deterioration in the gap unit 2 can be prevented, and the reliability and durability of the lightning arrester can be improved.

In addition, if the lightning arrester becomes unable to interrupt the follow-on current due to an excessive lightning surge, etc., and high-temperature, high-pressure gas is generated in the gap unit 2 due to the follow-on arc, in this embodiment, the gap unit 2 is Since it is constructed in a double cylindrical shape with an air space (A) between the protective sheet 19 and the non-linear resistor 11 for absorbing and mitigating impact vibrations, the high heat and pressure impact of the gas is shielded, and the ejected gas is absorbed into the air space between the protective sheet 19 and the non-linear resistor 11. Since the insulating container 1 is discharged in a jet to the outside of the insulating container, destruction of the insulating container 1 due to uneven heat or pressure impact is prevented, and scattering and falling of the insulating container 1 are prevented.

Note that this invention can also be embodied in the following manner. That is, (a) Fill the void A with a highly elastic insulating material such as foamed rubber to form a buffer layer.

(b) Filling the gap unit with an inert insulating gas to strengthen insulation and arc extinguishing properties.

(c) Embodiment of this idea into protective equipment such as cutouts.

Effects of the invention As detailed above, this invention provides a pair of inner and outer cylinders made of an inorganic insulating material, and a space is provided between the two, and both ends of the cylinders are provided with an inner part of the cylinders. In addition to sealing the cavity, the discharge electrodes facing each other are bonded and fixed, so when a follow-on current occurs in the lightning arrester and high-temperature, high-pressure gas is generated within the gap unit, the high heat is absorbed by the inner and outer cylinders and the buffer layer. It is possible to prevent damage to the insulating container of the lightning arrester by shielding it from pressure shock and scattering of the lightning arrester.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of a lightning arrester embodying this idea, and FIGS. 2, 3, and 4 are enlarged sectional views of the main parts. In the figure, 1...Insulating container, 2...Gap unit, 3...Inner cylinder, 4...Outer cylinder, 5...Discharge electrode.

Claims (1)

[Claims for Utility Model Registration] In a gap unit 2 housed in an insulating container 1 of a lightning arrester, a pair of inner and outer cylinders 3 and 4 made of an insulating material is provided, and an air space A is provided between the two, A gap unit for a lightning arrester characterized in that the inner cavities of both the cylindrical bodies 3 and 4 are closed and discharge electrodes 5 facing each other are bonded and fixed to both ends of the cylindrical bodies 3 and 4.