JPH023241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a lightning arrester with a built-in lightning arrester.

(Prior Art) Conventionally, as a lightning arrester insulator equipped with a lightning arrester element, electrode fittings 41 and 42 having pressure relief holes 43 are provided at both end openings of a cylindrical insulator tube 40 as shown in FIG.
The pressure release hole 43 is closed with a rupture plate 44, filled with an insulating gas such as air, and sealed.
0, there are power supply side and ground side electrodes 46, 47 on both ends.
The lightning arrester 45 connected to the contact fittings 37, 38,
39, and the openings at both ends of the insulator tube 40 and the electrode fittings 41, 42 are sealed with a gasket 48. Further, a cap fitting 50 is attached to the upper surface of the upper electrode fitting 41 via a mounting fitting 49, and the above-mentioned mounting A pressure relief passage 51a and a pressure relief port 5 are provided in a part of the metal fitting 49.
There is one that forms 1.

However, since this lightning arrester is provided with a rupture plate 44, a pressure relief passage 51a, a pressure relief port 51, etc., there is a problem in that the lightning arrester becomes large in size. Furthermore, since the insulating tube 40 has a sealed pressure release structure filled with gas, the gasket 48 is necessary, but if the airtightness is impaired due to deterioration of the gasket 48, there is a problem that the lightning arrester element 45 absorbs moisture and deteriorates. It was hot.

In addition, as shown in FIG.
An insulating cylinder 56 is fitted over the pin 55 to insulate the cross arm 52 and the pin 55, and a cylindrical lightning arrester element 58 and an electrode metal fitting are mounted on the insulating cylinder 56 between the base metal fitting 54 and the cross arm 52. 59, 60 and organic insulator 6
1, the lightning protection element 57 covered in step 1 is fitted, and the cross arm 52
An insulator device with a lightning arrester element has been proposed in which an insulating cylindrical body 62 made of porcelain or the like is disposed in series with the lightning arrester element 57 on the lower surface of the lightning arrester element. In this insulator device, when the short-circuit capacity during pressure release increases, the high pressure gas and heat generated during pressure release cause the lightning arrester 58 and the organic insulator 6 to
1 was damaged and scattered, and the support of the electric wire became unstable.
Furthermore, there was a risk of the electric wires falling or breaking.

(Problems to be Solved by the Invention) The present invention solves the problems existing in the conventional lightning arrester,
In other words, as the insulator becomes larger and the lightning protection element deteriorates due to moisture absorption due to the deterioration of the gas-tight seal, etc., and as the short-circuit capacity during pressure relief increases, the high-pressure gas and heat generated during pressure relief increase. This is an attempt to solve the problem that the lightning arrester element and the organic insulator are damaged and scattered, making the support of the electric wire unstable, and leading to the risk of the electric wire falling or breaking.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention includes fitting and fixing cap fittings to the openings at both ends of a cylindrical voltage-resistant insulating cylinder, and fixing the cap fittings inside the voltage-resistant insulating cylinder. accommodates a lightning arrester made of a material with non-linear voltage-current characteristics and is electrically connected to the cap fitting; a pressure relief hole is provided in the voltage-proof insulating tube; The structure is such that the voltage-resistant insulating cylinder is covered with an organic insulating material.

(Function) By employing the above means, the present invention reliably maintains airtightness at all times and prevents deterioration of the lightning arrester element due to moisture absorption or the like. In addition, when lightning surges occurring on power transmission and distribution lines are absorbed by lightning arrester elements, if excessive lightning surges exceeding the design withstand capacity of the lightning arrester are absorbed, penetration of the lightning arrester or flash shorting on the outer surface of the lightning arrester may occur. . In this case, the operating voltage of the power transmission and distribution line or its ground voltage will be short-circuited at the lightning arrester element. Hereinafter, this will be referred to as the time of pressure relief. The internal pressure increases due to the high-temperature and high-pressure arc generated at this time, and a part of the coating made of organic insulating material filled in the outer periphery of the pressure-resistant insulating cylinder and the pressure relief hole, that is, the inside of the pressure relief hole and the corresponding coating. is softened or melted by heat and extruded to the outside by pressure to forcibly form a pressure relief path leading to the outside, releasing the gas filled in the sheathing and preventing explosion damage to the voltage-resistant insulating tube of the lightning arrester. do.

(Examples) First Example A first example embodying the present invention will be described below with reference to FIGS. 1 to 3.

Figure 3 shows the entire power transmission line installation equipment.
A suspension insulator 3 is attached to the arm portion 1a by a hanging metal fitting 2.
is suspended, and an electric wire 5 is gripped and fixed to the lower end of the suspension insulator 3 by a gripping metal fitting 4.

Further, an arcing horn 6 is attached to the gripping fitting 4 diagonally upward, and a lightning arrester 8 of the present invention is attached to the hanging fitting 2 via a mounting fitting 7 so as to be positioned above the arcing horn 6. There is.

Next, the lightning arrester 8 will be explained with reference to FIGS. 1 and 2.

Excellent mechanical strength such as reinforced plastics
A pressure-resistant insulating cylinder 9 formed into a cylindrical shape from a material such as FRP has male threaded portions 9a and 9b formed on the outer periphery of both ends, and female threaded portions 1 and 1 are formed on the male threaded portions 9a and 9b.
Cap fittings 12 and 13 having 2a and 13a are screwed and fixed.

A plurality of pressure relief holes 10 are provided in the radial direction of the voltage-resistant insulating tube 9 in the center thereof in the axial direction, and other pressure relief holes 11a, 1 are provided near the male threaded portions 9a, 9b.
1b extends obliquely to the central axis of the insulating cylinder 9, and the upper pressure relief hole 11a faces downward and the lower pressure relief hole 11b faces upward.
Moreover, these pressure relief holes 10, 11a, 11b are the second
As shown in the figure, four locations are provided at equal intervals at the same height.

The cap fittings 12, 13 have locking pieces 12b, 1.
3b are each integrally formed, and this locking piece 12
Locking holes 12c and 13c are formed in b and 13b, so that they can be attached to the mounting fitting 7 or the like using bolts and nuts (not shown).

A plurality of lightning arrester elements 14 made of a material with non-linear voltage-current characteristics are housed in series in the voltage-resistant insulating tube 9, and both upper and lower ends thereof are connected to the back surfaces of the cap fittings 13, 12 via disc springs 16, 15. It is electrically connected to integrally formed protrusions 13d and 12d.

The outer peripheral surface of the voltage-resistant insulating tube 9 is coated with silicone rubber,
An outer covering part 17 made of an organic elastic insulating material such as ethylene propylene rubber is molded, and the outer covering part 17 is integrally formed with umbrella parts 17a at equal intervals. In addition, when molding the outer sheathing part 17, the gap between the inner circumferential surface of the voltage-resistant insulating cylinder 9 and the outer circumferential surface of the lightning arrester element 14 and the inside of the cap fittings 12, 13 are formed through the pressure relief holes 10, 11a, 11b. Also, the organic elastic insulating material is injected to form an inner covering part 18, which prevents movement of the lightning arrester element 14 and maintains airtightness and insulation.

Next, the operation of the lightning arrester 8 constructed as described above will be explained.

When a lightning surge occurs in the electric wire 5, this voltage is applied to the erection device, but at this time, the current flows through the gripping metal fitting 4.
→ Discharged through the arcing horn 6 to the cap fitting 12 on the energized side of the lightning arrester 8, and the disc spring 15 → lightning arrester 14 → the disc spring 16 → the cap fitting 13 on the grounding side → the mounting bracket 7 → the hanging bracket 2 → the steel tower. 1 and is grounded to the earth.

A lightning arrester element 14 built into the lightning arrester 8
However, due to the non-linearity of the voltage-current characteristics, the resistance value is quickly reduced to discharge the large lightning surge current and reduce the lightning surge voltage on the line. However, when receiving an excessive lightning surge and absorbing an excessive lightning surge that exceeds the design withstand capacity of the lightning arrester 14, the lightning arrester 14 may be penetrated or the outer surface of the lightning arrester 14 may be flashed. The operating voltage or its ground voltage is short-circuited at the lightning protection element. The high-temperature, high-pressure arc generated during this pressure release causes the internal pressure to rise (particularly near both ends of the lightning arrester element 14, this pressure rises rapidly and becomes high), and the outer periphery of the voltage-resistant insulating tube 9 and the pressure relief holes 10, 11a, Parts of the outer covering part 17 and inner covering part 18 made of an organic elastic insulating material filled in 11b, that is, the inside of the pressure relief holes 10, 11a, 11b and the covering parts corresponding thereto, are softened or melted by heat, and then by pressure. A pressure relief path leading to the outside is forcibly formed by extrusion to the outside, and the gas filled in the covering portion is released, thereby preventing explosion damage to the voltage-resistant insulating cylinder 9 of the lightning arrester 8.

In addition, in the embodiment described above, the pressure relief hole 10 was also provided in the center of the voltage-resistant insulating tube 9, but by doing so, the high temperature and high pressure arc generated in the center of the lightning arrester 8 can be removed through the pressure relief hole 10. Release the pressure-resistant insulation cylinder 9
It is possible to prevent an explosion in the central part of the lightning arrester 8, which is effective for a long lightning arrester 8.

However, in the above embodiment, the cap fittings 12, 1
At least one pressure relief hole 11 in the part corresponding to 3
Since most of the pressure is released by providing the hole a, a particularly short pressure relief hole in the middle of the lightning arrester 8 is not necessarily required.

In addition, in the embodiment of the present invention, a lightning arrester element 14 is built in the voltage-resistant insulating tube 9, and an outer covering portion 17 made of an organic elastic insulating material is provided on the outer peripheral surface of the voltage-resistant insulating tube 9 and in the gap between the insulating tube 9 and the lightning arrester element 14. Since the lightning arrester element 14 is hermetically sealed by molding the inner sheathing part 18,
It is possible to always maintain airtightness and prevent deterioration of the lightning arrester element 14 due to moisture absorption or the like.

Further, there is no need to provide a rupture plate or a pressure relief port in the vertical direction at both the upper and lower ends of the insulator tube as in conventional lightning arrester insulators, and the lightning arrester 8 does not become large in size.

Next, second to fourth embodiments will be described, and those having the same functions as those in the first embodiment will be denoted by the same reference numerals, and their explanation will be omitted.

Second Embodiment As shown in FIG. 4, the pressure relief hole 10 of the first embodiment,
11a, 11b and the vicinity of the inner covering portion 18 thereof are filled with a porous organic insulator 19.

This embodiment is characterized in that the pressure relief path is formed more quickly and reliably than in the first embodiment, and as a result, explosion damage to the lightning arrester 8 is less likely to occur.

Third Embodiment As shown in FIG.
Inner sheathing parts 18 and 20 are formed between the lightning arrester element 14 and the voltage-resistant insulating cylinder 9 and on the outer peripheral surface of the voltage-resistant insulating cylinder 9 using an organic elastic insulating material that does not have weather resistance. An outer covering part 21 comprising a bulk part 21a made of a weather-resistant organic elastic insulating material so as to cover the
form.

In this embodiment, compared to the first embodiment, the entire covering portion does not have to be made of an expensive weather-resistant material, so it is inexpensive and easy to manufacture.

Fourth Embodiment As shown in FIG.
The structure is such that a porous organic insulator 19 is filled near the sides.

In this embodiment, the pressure relief path is formed more quickly and reliably than in the third embodiment, and as a result,
It has the characteristic that the lightning arrester 8 is less likely to be damaged by explosion.

Effects of the Invention As detailed above, according to the present invention, it is possible to prevent the insulator from increasing in size, to ensure airtightness at all times, to prevent deterioration of the lightning protection element due to moisture absorption, and to absorb excessive lightning surges. The internal pressure rises due to the high-temperature, high-pressure arc that occurs during pressure relief, and the outer periphery of the voltage-proof insulating cylinder and part of the coating made of the organic insulating material filled in the pressure relief hole, that is, the inside of the pressure relief hole and the area surrounding it. The corresponding sheathing section is softened or melted by heat and forced out by pressure to forcibly form a pressure relief path leading to the outside, releasing the gas filled in the sheathing section and causing explosion damage to the voltage-resistant insulating tube of the lightning arrester. It has an excellent effect of preventing this.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the first embodiment, FIG. 2 is a sectional view taken along the line A-A in FIG. 4 is a sectional view showing the second embodiment, FIG. 5 is a sectional view showing the third embodiment, FIG. 6 is a sectional view showing the fourth embodiment, and FIGS. 7 and 8 are conventional It is a partial cross-sectional view showing an example. 8...Lightning arrester, 9...Voltage-resistant insulating cylinder, 10,1
1a, 11b... Pressure release hole, 12, 13... Cap metal fitting, 14... Lightning arrester element, 15, 16... Belleville spring, 17, 21... Outer cover part, 18, 20... Inner cover part, 19 ...Porous organic insulator.

Claims (1)

[Claims] 1. Cap fittings 12 and 13 are fitted and fixed to the openings at both ends of a cylindrical voltage-resistant insulating tube 9, and a material having non-linear voltage-current characteristics is placed inside the voltage-resistant insulating tube 9. The lightning arrester element 14 is housed therein and is electrically connected to the cap fittings 12 and 13, and pressure relief holes 10, 11a, and 11b are provided in the voltage-resistant insulating cylinder 9, and the lightning arrester element 14 and the voltage-resistant A lightning arrester characterized in that an insulating cylinder 9 is covered with an organic insulating material. 2. The lightning arrester according to claim 1, wherein the pressure relief holes 11a and 11b are provided near the ends of the cap fittings 12 and 13. 3. The pressure relief hole 10 is provided in a hollow portion in the axial direction of the voltage-resistant insulating cylinder 9.
Lightning arrester as described in section. 4 Pressure relief holes 10, 11a, 11b are pressure-resistant insulation tubes 9
The lightning arrester according to claim 1, wherein the lightning arrester is filled with an organic insulating material covering the lightning arrester. 5. The lightning arrester according to claim 1, wherein the pressure relief holes 10, 11a, 11b are filled with a porous organic insulator 19. 6. The voltage-resistant insulating cylinder 9 is covered with two layers of organic insulating material, and the outer layer is a weather-resistant organic insulating material,
The lightning arrester according to claim 1, wherein the inner layer is an organic insulating material that does not have weather resistance.