JPH0253889B2 - - 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 equipped with a lightning arrester,
In No. 54-22922, a lightning arrester element and a gap element are housed in a cylindrical insulator tube 40 as shown in FIG. The insulator tube 40 is sealed by attaching electrode plates 41 and 42 that close the pressure ports, gas discharge passages 43 and 44 are formed in the electrode plates 41 and 42, and a gutter-shaped arc is formed in the discharge passages 43 and 44. A structure in which horns 45 and 46 are connected has been proposed.

Furthermore, in Utility Model Application Laid-open No. 55-35736, the applicant of the present invention previously fitted a ring-shaped lightning arrester element 48 to a tensile insulating rod 47 as shown in FIG.
Cap fittings 49 and 50 are disposed at both ends of the lightning arrester element 48, and the lightning arrester element 48 is held between the cap fittings 49 and 50 under the elastic body 51, and the outer periphery of the lightning arrester element 48 is molded with an organic insulator 52. proposed a structure in which the lightning arrester element 48 is enclosed in a hermetically sealed manner.

(Problems to be Solved by the Invention) However, in the former of the above two conventional examples, the effect of the arc horn (charged high temperature gas (plasma) is
6 and suppressing the discharge inside the insulator tube 40), the pressure relief port and the discharge passages 43 and 44 for blowing out the high temperature and high pressure gas generated during pressure relief must be connected to both ends of the insulator tube 40. There is a problem in that the lightning arrester becomes large in size. Furthermore, in the latter case, when the short-circuit capacity increases during pressure release, there is a problem in that the lightning arrester element 48 and the organic insulator 52 are easily damaged and scattered by the high pressure gas and heat generated during pressure release. .

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. contains a lightning arrester made of a material with non-linear voltage-current characteristics and is electrically connected to the cap fitting, and the voltage-resistant insulating tube has at least one lightning arrester made of a material with non-linear voltage-current characteristics, and at least one lightning arrester is provided in the voltage-resistant insulating tube so as to correspond to both ends of the lightning arrester. A pressure hole is formed through the cap metal fitting, and an arc-inducing member is provided in the cap fitting so as to correspond to the outside of the pressure relief hole, and the outer periphery of the voltage-resistant insulating cylinder and the gap between the voltage-resistant insulating cylinder and the lightning arrester element are The structure is such that an outer covering part and an inner covering part are formed by molding with an insulating material, and the pressure release hole is filled 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 and the like. Furthermore, when lightning surges occurring on power transmission and distribution lines are absorbed by lightning arrester elements, if excessive lightning surges exceeding the designed withstand capacity are absorbed, penetration of the lightning arrester element or flash shorting on the outer surface of the lightning arrester element occurs. In this case, the operating voltage of the power transmission and distribution line or its ground voltage will be short-circuited at the lightning protection element. The high-temperature, high-pressure arc that occurs at this time increases the internal pressure, softening or melting the organic insulating material filled in the pressure relief hole and the corresponding outer covering, and pushing them out due to pressure, leading to the outside. A pressure relief path is forcibly formed to release the gas filled in the pressure insulating cylinder to prevent explosion damage to the voltage insulating cylinder.

Then, the charged high-temperature, high-pressure gas released during pressure relief, that is, the arc jet, is received by a pair of arc-inducing members provided on the cap metal fittings so as to face the pressure relief hole, and the arc path is routed from inside the insulator to outside. In addition, an external arc path is formed between both arc guiding members, and the arc inside the insulator is extinguished.

(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 fitting 4.

Further, an arcing horn 6 is attached to the gripping fitting 4 in an upward direction, and a lightning arrester 8 of the present invention is opposed to the arcing horn 6 with a fixed discharge gap on the hanging fitting 2 via a mounting fitting 7. installed to do so.

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

Male threaded portions 9a, 9b are formed on the outer periphery of both ends of the pressure-resistant insulating cylinder 9, which is formed into a cylindrical shape from a material with excellent mechanical strength such as reinforced plastic (for example, FRP). Female thread part 1
Cap fittings 12 and 13 having 2a and 13a are screwed and fixed.

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 rod-shaped electrodes 18 and 17 that are screwed together.

The voltage-resistant insulating cylinder 9 is provided with an insulating cylinder 9 so as to correspond to the disc springs 15 and 16 at both ends of the lightning arrester element 14.
Pressure relief hole 11 in a direction oblique to the central axis of
a, 11b are formed through the upper pressure relief hole 11b, and the lower pressure relief hole 11a is formed facing downward. Moreover, these pressure relief holes 11a and 11b are
As shown in the figure, two locations are provided symmetrically 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).

On the entire circumference of the opening edges of both cap fittings 12 and 13, there is an arc-inducing tube 1 as an arc-inducing member having a truncated conical shape so as to correspond to the pressure relief holes 11a and 11b.
9 and 20 are integrally formed so as to face each other with a constant discharge interval. In addition, there are drain holes 19a near the base ends of both arc guide tubes 19 and 20.
20a is installed transparently to prevent raindrops from accumulating and to prevent the arc-inducing cylinder 19 from increasing local pressure during pressure release.
20 to prevent damage.

Further, two injection holes 21 for an organic insulating material (to be described later) are formed in the cap fitting 13, and a plug 22 is screwed into the two injection holes 21.

Inside the pressure release holes 11a and 11b and the disc spring 15,
The outer periphery of 16 is filled with porous organic insulator 23 .

The outer peripheral surface of the voltage-resistant insulating tube 9 is coated with silicone rubber,
An outer cover 24 made of a weather-resistant organic elastic insulating material such as ethylene propylene rubber is molded, and the outer cover 24 is integrally formed with pleats 24a at equal intervals. In addition, the gap between the inner peripheral surface of the voltage-resistant insulating cylinder 9 and the outer peripheral surface of the lightning arrester element 14 and the inside of the cap metal fittings 12 and 13 are filled with the cap metal fittings 13.
The organic elastic insulating material is injected through the injection hole 21 to form the inner covering part 25, 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 the electric wire 5 is struck by lightning, the lightning surge voltage generated on the line is applied to the construction equipment, but at this time, the current flows from the grip 4 to the arcing horn 6 to the cap on the energized side of the lightning arrester 8. Discharge is applied to the metal fitting 12, and the rod-shaped electrode 17→disc spring 15→lightning arrester element 14
→ Disc spring 16 → Rod-shaped electrode 18 → Ground side cap metal fitting 13 → Mounting metal fitting 7 → Hanging metal fitting 2 → Grounded to the earth via steel tower 1.

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, the lightning surge current is discharged, and the lightning surge voltage on the line is quickly reduced. At this time, if an excessive lightning surge exceeding the design withstand capacity of the lightning arrester 14 is absorbed, the outer surface of the lightning arrester 14 or the lightning surge of the lightning arrester 1
This results in 4 penetrations. In this case, the operating voltage of the line or its ground voltage will be short-circuited at the lightning arrester element. The high temperature and
The internal pressure rises due to the high-pressure arc, and the porous organic insulator 23 filled in the pressure release holes 11a, 11b of the voltage-resistant insulating cylinder 9 and the corresponding outer covering part 24 are partially softened or melted by heat. By forcing the pressure to the outside and forcibly forming a pressure relief path leading to the outside, the gas filled in the pressure insulating tube 9 can be released, thereby preventing explosion damage to the pressure insulating tube 9.

Then, the charged high-temperature, high-pressure gas released during this pressure release, that is, the arc jet, is transferred to the arc inducing cylinder 1 corresponding to the pressure release holes 11a and 11b.
9 and 20 receive the arc path, and the voltage-resistant insulating tube 9
The arc is quickly transferred from the inside to the outside, and further, an external arc path is formed between both arc induction tubes 19 and 20 by the arc jet that hits the arc induction tubes 19 and 20, and the arc inside the voltage-resistant insulation tube 9 is extinguished. can be done.

In addition, in the embodiment of the present invention, the lightning arrester element 14 is built in the voltage-resistant insulating tube 9, and an outer cover portion 24 made of an organic elastic insulating material is provided on the outer peripheral surface of the voltage-resistant insulating tube 9 and the gap between the insulating tube 9 and the lightning arrester element 14. Since the inner sheathing part 25 is molded to hermetically encapsulate the lightning arrester element 14, airtightness is always maintained reliably and deterioration of the lightning arrester element 14 due to moisture absorption etc. can be prevented.

Further, unlike conventional lightning arresters, there is no need to provide a pressure relief film or a pressure release port in the vertical direction on both the upper and lower ends of the insulator tube, and the lightning arrester 8 does not become large in size.

In addition, in the above embodiment, the arc guide tubes 19, 20
Water drainage holes 19a and 20a are provided in the arc guide tubes 19 and 20 to prevent raindrops from accumulating, and the water at the bottom of the arc guide tubes 19 and 20 is rapidly heated and vaporized when the pressure is released, causing a local pressure increase. , 20 can be prevented from being damaged.

Second Example Next, a second example will be described.
Components having the same functions as those in the embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted.

Both cap metal fittings 12, 13 as shown in FIG.
In place of the rod-shaped electrodes 17 and 18 of the first embodiment, protrusions 12d and 13d are integrally formed on the back surface, and the injection hole 21 is omitted in the drawing.

Pressure relief holes 26a and 26b are provided perpendicularly to the voltage-resistant insulating cylinder 9, and are filled with a porous organic insulator 23.

As shown in FIG. 5, arc guiding members formed separately from the cap metal fittings 12 and 13 are fixed to both the cap metal fittings 12 and 13. This arc inducing member includes a mounting ring 27 fitted and fixed to both cap fittings 12 and 13, and a pair of arc inducing plates 28 connected to the mounting ring 27 and disposed opposite to the pressure relief holes 26a and 26b. , and an annular arc-inducing ring 29 connected to the tip of the arc-inducing plate 28.

Inside the cap fittings 12 and 13, and in the gap between the lightning arrester element 14 and the voltage-resistant insulating tube 9, an inner covering portion 25 is formed of an organic elastic insulating material that does not have weather resistance (for example, polyethylene, chloroprene rubber, etc.).
The outer peripheral surface includes an inner layer 30 made of a non-weather-resistant organic elastic insulating material (e.g., polyethylene, chloroprene rubber, etc.) and a bulk portion made of a weather-resistant organic elastic insulating material (e.g., silicone rubber, ethylene-propylene rubber, etc.). A jacket part 32 is formed, which consists of an outer layer 31 with 31a.

In this embodiment, if the arc guiding member is damaged, it can be replaced, and compared to the first embodiment, only the outer layer 31 needs to be made of an expensive weather-resistant material, so it can be manufactured at a lower cost. Can be done.

Note that the present invention is not limited to the above embodiments, and the arc guide ring 29 in the second embodiment
Instead, the arc guiding member may be provided with an arc guiding piece 33 made of an elliptical thin plate as shown in FIG.

In addition, the pressure release holes 11a, 11b, 26a, 26b
Also, instead of the porous organic insulator 23 filled around the outer periphery of the disc springs 15 and 16, an organic insulating material may be filled.

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. In response to the increase in internal pressure caused by the high temperature and high pressure arc during pressure relief, the organic insulating material filled in the pressure relief hole and the corresponding organic insulating material on the outer periphery of the voltage-resistant insulation cylinder are softened or melted by heat. A pressure relief path is forcibly formed that leads to the outside by being pushed out by pressure, and the gas filled in the pressure-resistant insulating cylinder, that is, the arc jet, is released, and the released arc jet is received by a pair of arc inviting members, and the arc path is It is excellent in that it quickly transfers the arc from inside the insulator to the outside, and furthermore, it forms an external arc path between both arc-inducing members, extinguishes the arc inside the insulator, and prevents explosion damage to the voltage-resistant insulating tube of the lightning arrester insulator. It has a positive effect.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the lightning arrester of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is a front view showing the main parts of the electric wire erection device with a lightning arrester attached, and FIG. 4 is a cross-sectional view showing the second embodiment.
5 is a sectional view taken along the line B--B in FIG. 4, FIG. 6 is a sectional view showing another example, FIG. 7 is a front view showing a conventional example, and FIG. 8 is a sectional view showing a conventional example. 8... Lightning arrester, 9... Voltage-proof insulating tube, 11a,
11b, 26a, 26b...pressure release hole, 12, 13
...Cap metal fitting, 14...Lightning arrester element, 19,2
0... Arc guiding cylinder, 23... Porous organic insulator, 24, 32... Outer covering part, 25... Inner covering part, 2
8... Arc invitation plate, 29... Arc invitation ring, 3
3...Arc summoning piece.

Claims (1)

[Scope of Claims] 1. Cap fittings 12 and 13 are fitted and fixed to the openings at both ends of a cylindrical voltage-resistant insulating cylinder 9, and a material having non-linear voltage-current characteristics is placed inside the voltage-resistant insulating cylinder 9. The cap fitting 1 accommodates the lightning arrester 14.
2 and 13, and at least one pressure relief hole 11a, 11b, 26 is provided in the voltage-resistant insulating tube 9 so as to correspond to both ends of the lightning arrester element 14.
a, 26b are provided transparently, and the cap metal fittings 12, 1
3, an arc inviting member is connected to the pressure relief holes 11a, 11.
b, 26a, and 26b so as to correspond to each other on the outside, and furthermore, the outer periphery of the voltage-resistant insulating tube 9 and the gap between the voltage-resistant insulating tube 9 and the lightning arrester element 14 are molded with an organic insulating material to form an outer cover and an inner cover, respectively. The pressure relief holes 11a, 11b, 26a, 26b
A lightning protection insulator characterized by being filled with an organic insulating material. 2 The arc guiding members are both cap metal fittings 12, 13
The arc guide tubes 19 and 20 are integrally formed in the shape of a truncated conical tube at the edge of the opening, and have one or more drain holes 19a,
20a is formed. 20a. The lightning arrester according to claim 1. 3 Arc guiding members are both cap metal fittings 12, 13
a mounting ring 27 fitted and fixed to the mounting ring 27; an arc-inducing plate 28 connected to the mounting ring 27 and disposed opposite to the pressure relief holes 26a and 26b; The lightning arrester according to claim 1, comprising an annular arc guide ring 29. 4. The lightning arrester according to claim 1, wherein the pressure relief holes 11a, 11b, 26a, and 26b are filled with a porous organic insulator 23. 5 The outer cover is formed of two layers of organic insulating material,
The lightning arrester according to claim 1, wherein the outer layer is an organic insulating material that has weather resistance, and the inner layer is an organic insulating material that does not have weather resistance.