JPH07262844A - Failure indicator for lighting protection insulator and lighting protection insulator employing the indicator - Google Patents

Abstract

PURPOSE:To provide a failure indicator for a lighting protection insulator, which is simple in constitution, and can facilitate its manufacturing and installing works. CONSTITUTION:Each ring 11 is roughly identical in diameter to the barrel section 9 of a lighting protection insulator, is larger in width than the diameter of each pressure release hole 2, and is formed into a ring shape. In each ring 11, the surface opposite to each pressure release hole 2 is made to be a pressure bearing surface 11a. A part of each ring 11 is cut off, so that a clearance section is thereby formed therein. Color different from that for the outer surface of the lighting protection insulator is coated over each ring 11, so that an indicator 10 is thereby formed. The indicator 10 is fitted on the barrel section 9 of the lighting protection insulator so as to be fixed there with adhesives.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fault arrester for a lightning arrestor that notifies a fault of the lightning arrester, and a lightning arrester having the fault indicator.

[0002]

2. Description of the Related Art Generally, in a lightning arrester device, a current limiting element made of zinc oxide or the like having a non-linear voltage-current characteristic is housed inside. When an unexpected lightning surge current flows through this current limiting element, the current limiting element becomes conductive and it becomes impossible to interrupt the subsequent current that occurs thereafter, which may cause a ground fault.

In the above state, the function as a lightning protection insulator is lost. For this reason, it is necessary to immediately find the defective lightning arrester and replace it with a new one. Conventionally, a display tool 29 as shown in FIGS. 5 and 6 has been proposed in order to detect a failure of the lightning protection insulator device. That is, the display tool 29 is fitted on the body of the lightning protection insulator 34. The pressure receiving unit 30 receives the high pressure gas generated from the current limiting element 35 due to the lightning surge current at the time of lightning strike. The petal-shaped display unit 31 is fixed to the pressure receiving unit 30. The fixing portion 32 having a hook fixes the pressure receiving portion 30 to the lightning protection insulator 34, and
It is dissociated by the pressure of the high-pressure gas to release the fixation of the pressure receiving portion 30. When the display tool 29 is mounted on the lightning protection insulator 34, the mounted state of the display tool 29 can be confirmed by the display unit 31 from a distance.

When a lightning surge current more than expected flows through the lightning arrester 34, the current limiting element 35 becomes conductive, and the high pressure gas generated by the follow current is ejected from the pressure release port 36 of the lightning arrester 34. The pressure receiving portion 30 receives the gas pressure, whereby the fixing portion 32 releases the fixation of the pressure receiving portion 30, and the display 29
Is dropped. Therefore, it can be seen at a glance that the display unit 31 is not attached to the lightning protection insulator 34, and a failure of the lightning protection insulator 34 can be found.

[0005]

However, in the above-described conventional technique, when the display tool 29 is mounted on the lightning protection insulator 34, a lightning surge current flows through the lightning protection insulator 34 due to a strong wind pressure on the display unit 31 during a typhoon. Although it is not flowing, there is a risk of it coming off, and in such a case, there was a risk of misidentification of a failure of the lightning arrester 34. Even if the display tool 29 does not come off due to the wind pressure, the lightning protection insulator 34 may be shaken by the wind pressure, or the lightning protection insulator 34 may be continuously vibrated, and the lightning protection insulator 34 may be damaged.

Further, the conventional display device 29 includes a pressure receiving portion 30,
Since it is necessary to provide the display unit 31, the fixing unit 32, etc., the structure is complicated and large in size, and it is troublesome to manufacture and install the unit.

The present invention has been made by paying attention to the problems existing in the above-mentioned prior art, and the purpose thereof is not to make an erroneous display, the structure is simple, and the manufacturing and the installation thereof can be easily performed. To provide a failure indicator for a lightning arrester and a lightning arrester having the failure indicator.

[0008]

Means for Solving the Problems In order to achieve the above object, in the invention of claim 1, it is fitted on the outer side surface of an insulating cylinder, is generated in the insulating cylinder at the time of failure, and is discharged from a pressure release port. A ring for receiving high-pressure gas, a discriminating portion for allowing the ring to be released from the fitted state when the high-pressure gas is received, and an identifying means for identifying the ring mounted on the lightning arrestor And are provided.

Further, in the invention of claim 2, the identifying means colors the ring with a color different from that of the lightning protection insulator. Further, in the invention of claim 3, the lightning insulator failure display device of claim 1 or 2 is provided.

[0010]

In the invention of claim 1 having the above-mentioned configuration, in a state where the display tool is fitted in the lightning protection insulator, the fitting state can be identified by the identifying means. When an unexpectedly large-scale lightning surge current flows through the lightning arrestor, the current limiting element becomes conductive, and high-pressure gas is generated and released by the follow current, force is applied to the ring in the direction to release the fitting and fixing. Works, the separation part opens and the ring is dropped from the insulating cylinder. For this reason,
A worker or the like recognizes a failure of the lightning arrester.

According to the second aspect of the present invention, the identification means is provided by coloring the ring with a color different from that of the lightning protection insulator. For this reason, the distinguishability from a distant place becomes high. Claim 3
In the invention, the lightning protection insulator has the display device having the above-mentioned configuration. For this reason, it becomes possible to quickly detect a failure of the lightning protection insulator.

[0012]

Embodiment Hereinafter, an embodiment embodying the present invention will be described with reference to FIG.
~ It demonstrates according to FIG. First, the lightning protection insulator will be described. As shown in FIGS. 2 and 3, the insulating cylinder 1 is formed with a pressure release port 2 for releasing high-pressure gas generated at the time of failure. Therefore, the insulating cylinder 1 has a pressure release function. In particular, as shown in FIG. 4, a pair of pressure relief ports 2 are formed on the peripheral wall of the insulating cylinder 1 at symmetrical positions about the axis thereof, and the pair of pressure relief ports 2 are provided at a plurality of upper and lower positions so that the directions of the pressure relief ports 2 are different. ing. Electrode fittings 3 and 4 are fitted to the upper and lower ends of the insulating cylinder 1. In the insulating cylinder 1, a large number of current limiting elements 5 mainly made of zinc oxide or the like having a non-linear voltage-current characteristic are stacked and housed in series. Inner peripheral surface of insulating cylinder 1 and current limiting element 5
An insulating filler such as silicon rubber is injected between the outer peripheral surface and the outer peripheral surface to form an insulating layer 6, which prevents movement of the current limiting element 5 and maintains airtightness and insulation. An insulating jacket 7 is formed on the outer peripheral surface of the insulating cylinder 1, and a large number of cap portions 8 are integrally formed around the insulating jacket 7.

Explaining the display tool 10, as shown in FIG. 1, the ring 11 is made of a soft elastic material having a spring property, and is made of a plastic such as acrylic, polycarbonate, or polyethylene. Same ring 1
Reference numeral 1 has a width substantially the same as that of the body portion 9 of the lightning protection insulator and larger than the diameter of the pressure release port 2. A surface of the ring 11 facing the pressure release port 2 is referred to as a pressure receiving surface 11a. A part of the ring 11 is separated to form a separating portion 12.

The ring 11 has a color different from the color of the outer surface of the insulating cylinder 1. This is colored by mixing a colorant when molding the ring 11 with plastic or the like, or by painting a paint after molding. This coloring constitutes identification means. This coloring is preferably colored in contrast with the surface color of the lightning insulator, for example, if the surface of the lightning insulator is black, it is colored white, and if the lightning insulator is white, it is colored black. . As described above, the display tool 10 is configured by separating the ring 11 to form the spacing portion 12 and coloring the ring 11.

The display tool 10 is provided on the body 9 near the upper and lower portions of the above-mentioned lightning protection insulator so that the pressure release port 2 formed therein and the pressure receiving surface 11a of the display tool 10 face each other. It is fitted and fixed in spots with an adhesive if necessary. The reason why the lightning insulator is fixed to the pressure release ports 2 near the upper and lower portions of the lightning arrestor is that the high pressure gas is easily blown from there since it is near the electrodes. In addition, the display 1
0 may be attached, or it may be attached other than near the upper and lower parts, for example, near the center of the body 9.

Therefore, when the display tool 10 is mounted on the lightning protection insulator, the mounting condition can be reliably identified from the ground or on the helicopter by coloring, and the lightning protection insulator can operate normally without being damaged. You can confirm that it is in a state.

When a large-scale lightning surge current that exceeds the assumption flows through the lightning protection insulator, the current limiting element 5
Becomes a conductive state and a follow-up current flows after a lightning surge, resulting in a ground fault. At this time, the inside of the lightning protection insulator is instantaneously filled with high-pressure gas. This high-pressure gas breaks the insulating jacket 7 from the pressure release port 2 and applies pressure to the pressure receiving surface 11 a of the display 10. The display tool 10 to which the pressure of the high-pressure gas is applied bends in the expanding direction against the elastic force thereof, whereby the separating portion 12
Are separated from each other and the display tool 10 is dropped from the body portion 9 of the insulating cylinder 1. Therefore, a different color part of the lightning protection insulator (display 1
0) does not exist, and the damage of the lightning protection insulator is displayed.

Therefore, the damaged lightning arrestor is monitored from the ground or from the helicopter as described above, and if the display tool 10 can identify the lightning arrestor, it is determined that the lightning insulator is normal, and the lightning insulator is identified. If it cannot be done, it is determined to be a failure.

As described above in detail, according to the present embodiment having the above-described structure, since the display device 10 has a simple ring shape in which some of the display devices 10 are separated from each other, the structure is simple and the manufacturing and mounting can be easily performed. .

Further, since the distinctiveness from a distant place is enhanced by coloring, it is not necessary to provide the large display section 31 unlike the prior art shown in FIG. Therefore, it can be made compact and can be manufactured at low cost.

In addition, unlike the prior art, since there is no display portion 31 such as a petal that greatly protrudes, there is no possibility of a false display due to the wind pressure when it is attached to the lightning arrestor. Further, in this embodiment, the coloring as the identification means uses a color which is in contrast to the lightning protection insulator. Therefore, the distinguishability is improved.

The present invention is not limited to the above embodiments, and can be carried out in the following modes without departing from the spirit of the present invention. (1) In the ring 11, for example, the strength of the peripheral surface in the vicinity of the symmetrical position with respect to the separating portion 12 is formed to be weaker than that of other portions (for example, making a notch or making the portion thin). With this configuration, when the pressure receiving surface 11a receives the high pressure gas and the display tool 10 bends in the direction to release the fitting, the weak portion of the display tool is actively cracked, and the display tool 10 is easily dropped. Therefore, it is possible to prevent the display tool 10 from being dropped. (2) Use fluorescent paint for coloring the ring 11. In this way, it becomes easy to identify the lightning protection insulator even at night. (3) Draw a pattern on the ring 11 as an identification means.
This makes it easier to identify. (4) The display tool 10 and the lightning protection insulator are connected by a string-shaped connecting member. In this way, the display tool 10 is not dropped and can be reused.

The technical ideas other than the claims that can be understood from the above-described embodiments will be described below along with their effects. (1) The fault indicator for a lightning protection insulator according to claim 2, wherein a color opposite to the surface color of the lightning protection insulator is colored.

In this way, the distinguishability of the display 10 with respect to the lightning arrestor is further improved. Separation portion: In the present specification, the separation portion allows the display device 10 to drop from the lightning protection insulator when the display device 10 receives a high pressure gas.

[0025]

As described above in detail, according to the first aspect of the invention, since the structure can be made compact, the manufacturing cost and the installation cost can be kept low. Further, there is no erroneous display, and the distinguishability from a distant place becomes high without providing a large display section.

According to the second aspect of the present invention, the distinguishability from a distance is further enhanced. According to the invention of claim 3, it becomes possible to promptly detect the failure of the lightning protection insulator.

[Brief description of drawings]

FIG. 1 is a perspective view of a failure display tool showing an embodiment embodying the present invention.

FIG. 2 is a cutaway view showing a state in which a failure indicator is attached to the lightning protection insulator.

FIG. 3 is an enlarged view of the vicinity of a pressure release port in FIG.

FIG. 4 is a cross-sectional view of a pressure relief port of a lightning arrester.

FIG. 5 is a top view showing a conventional failure display tool.

FIG. 6 is a partial cross-sectional view showing a state in which a conventional fault indicator is attached to a lightning protection insulator.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Insulating cylinder, 2 ... Pressure release port, 5 ... Current limiting element, 10 ... Fault display tool, 11 ... Ring, 11a ... Pressure receiving surface for receiving high pressure gas, 12 ... Separation part.

Claims (3)

[Claims] 1. A fault indicator for a lightning arrestor, which is attached to a lightning arrester in which a current limiting element is housed in an insulating cylinder having a pressure release port on a side surface and which notifies a failure of the lightning arrester, comprising: A ring that is fitted to the outer surface and receives the high pressure gas that is generated in the insulating cylinder when a failure occurs and is released from the pressure release port to allow the ring to be released from the fitted state when receiving the high pressure gas. Failure indicator for a lightning arrester, which is provided with the separated portion and an identification means for identifying the ring attached to the lightning arrester. 2. The fault indicator for a lightning protection insulator according to claim 1, wherein the identification means colors the ring differently from the lightning protection insulator. 3. A lightning arrester having the fault indicator for a lightning insulator according to claim 1 or 2.