Light shielding sheet and gas leak repairing method

Abstract

To provide a light shielding sheet and a gas leak repair method capable of easily performing curing for light shielding related to repair work of a gas leak part of a gas circuit breaker.SOLUTION: A light shielding sheet 1 used for gas leak repair of a gas circuit breaker includes a sheet body 10, an opening 11 formed in the sheet body 10 and wound around a bushing of the gas circuit breaker, and a first opening / closing part 12 connected from one side of the sheet body 10 to the opening 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a light-shielding sheet and a gas leak repair method for repairing insulating gas leaks caused by deterioration of the sealing performance of flange packing due to aging of a gas circuit breaker or pinholes in welds. [Background technology]

[0002] A gas circuit breaker is a circuit breaker that switches current in an insulating gas. In gas circuit breakers, there is a risk that the insulating gas inside the gas circuit breaker may leak to the outside due to a decrease in the sealing performance of the packing in the flange, pinholes in the welds of pipes and tanks, or deterioration over time in the cementing parts of the bushing. If a gas leak is left unchecked, the insulating gas inside the gas circuit breaker will be lost, reducing the insulating performance and potentially leading to an electrical equipment accident, so it is necessary to repair the gas leak area as soon as possible.

[0003] An example of a method for repairing a gas leak is to fill the gas leak area with a repair agent that hardens when exposed to ultraviolet light (ultraviolet-curing repair agent), and then expose the filled repair agent to ultraviolet light to harden the repair agent and seal the gas leak area (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-89704 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the process of filling the gas leak area with an ultraviolet-curing repair agent as described in Patent Document 1, if strong ultraviolet rays such as direct sunlight are applied, the repair agent will harden before it can penetrate the holes and cracks in the gas leak area. Therefore, when using an ultraviolet-curing repair agent, it is necessary to carry out the work in an environment that is shielded from direct sunlight. Therefore, workers must cover the gas leak area with a light-shielding sheet or the like and work inside.

[0006] As shown in Fig. 5, the gas circuit breaker 3 is connected to an overhead line 32 via a bushing 31. Gas leaks occur at cementing parts of the bushing 31, flanges, pipe connections, welds, etc. Therefore, if an attempt is made to shield the gas leak points with a general rectangular shading sheet, it becomes necessary to use multiple shading sheets to surround the bushing 31, which makes the work complicated.

[0007] The present invention has been made in consideration of these points, and aims to provide a shading sheet and a gas leak repair method that allow for easy shading protection during repair work on gas leak points in gas circuit breakers. [Means for solving the problem]

[0008] As a means for solving the problems of the above-mentioned background art, a typical configuration of the present invention is a shading sheet used to repair gas leaks in gas circuit breakers, characterized by comprising a sheet body, an opening formed in the sheet body to be wrapped around a bushing of the gas circuit breaker, and a first opening / closing portion connecting one side of the sheet body to the opening.

[0009] The above-mentioned shading sheet has a tubular portion that is joined along the edge of the opening and wound around the bushing, and the tubular portion is provided with a second opening / closing portion that connects from the upper end to the lower end of the tubular portion, and it is preferable that the first opening / closing portion and the second opening / closing portion are continuously connected.

[0010] The shading sheet may have a tapered portion on the cylindrical portion that narrows the upper end of the cylindrical portion.

[0011] A typical configuration of the gas leak repair method of the present invention is characterized in that the opening is wrapped around the bushing using the above-mentioned shading sheet, the first opening / closing part is closed to cover the gas circuit breaker with the shading sheet, and the gas leak location is repaired using an ultraviolet-curing repair agent. [Effects of the Invention]

[0012] According to the light-shielding sheet and gas leak repair method of the present invention, it is possible to easily implement light-shielding protection during repair work on a gas leak location in a gas circuit breaker. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing a light-shielding sheet according to the present invention. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a diagram illustrating a state in which the gas circuit breaker is covered with a light-shielding sheet. [Figure 5] FIG. 1 is a perspective view of a gas circuit breaker that is the target of gas leak repair. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present invention will be described with reference to the drawings.

[0015] FIG. 1 shows a diagram of a shading sheet 1 according to the present invention. FIG. 1(a) is the front side (plan view), and (b) is the back side (bottom view). The shading sheet 1 has an opening 11 in a sheet body 10 for winding around a bushing 31. It also has a first opening / closing section 12 that connects one side of the sheet body 10 to the opening 11. In this embodiment, there is one opening 11, but two or more openings may be provided depending on the structure of the gas circuit breaker 3.

[0016] The sheet body 10 is, for example, a rectangular sheet made of synthetic fiber such as polyester. However, the material of the sheet body 10 is not limited to the above example, as long as it is a flexible sheet that has a light-blocking effect. The shape of the sheet body 10 is also not limited to a rectangle, as long as it is a shape that can block light from the gas leak point of the gas circuit breaker 3. In addition, in this embodiment, grommets 10a are provided at predetermined intervals on the four sides of the sheet body.

[0017] The first opening / closing section 12 connects one side of the seat main body 10 to the opening 11. Opening the first opening / closing section 12 cuts open the seat main body 10 from one side to the opening 11. A line fastener (first line fastener 12a) is used for the first opening / closing section, but other openable / closable structures such as buttons can also be used. A first flap 12b that covers the entire length of the first line fastener 12a is provided on the back side of the seat main body 10. The first flap 12b is joined to the seat main body 10 at one longitudinal side by sewing or the like, and is detachable from the seat main body 10 at the other side by a first hook-and-loop fastener 12c. In this embodiment, the first flap 12b is provided on the back side of the seat main body 10, but it may also be provided on the front side.

[0018] Fig. 2 is a perspective view of the cylindrical portion, Fig. 2(a) is a view showing a state in which the first opening / closing unit 12 and the second opening / closing unit 21 are open, and Fig. 2(b) is a view showing a state in which the first opening / closing unit 12 and the second opening / closing unit 21 are closed. Fig. 3 is a view for explaining the cylindrical portion, Fig. 3(a) is a plan view, Fig. 3(b) is a front view, and Fig. 3(c) is an AA cross-sectional view of Fig. 3(a).

[0019] As shown in FIG. 2, the light blocking sheet 1 may have a configuration in which a tubular portion 20 to be wound around a bushing 31 is provided at the opening 11.

[0020] The tubular portion 20 is joined by sewing or the like along the edge of the opening 11. In this embodiment, the material of the tubular portion 20 is the same synthetic fiber such as polyester as the sheet body 10, but other materials may be used as long as they are light-blocking and flexible.

[0021] The tubular portion 20 has a second opening and closing portion 21 that connects the upper end to the lower end of the tubular portion 20. The second opening and closing portion 21 is made up of a line fastener (second line fastener 21a) like the first opening and closing portion 12, and the first opening and closing portion 12 and the second opening and closing portion 21 are continuously connected. In other words, the first line fastener 12a and the second line fastener 21a are made up of a single line fastener.

[0022] Additionally, a second flap 21b that covers the second line fastener 21a from the outside is provided in the second opening / closing section 21. One side of the second flap 21b is joined to the tubular section 20 by sewing or the like, and the other side is detachably attached to the tubular section 20 by a second hook-and-loop fastener 21c.

[0023] Furthermore, the upper side of the cylindrical portion 20 is provided with a tapered portion 22. As shown in Figures 2 and 3, the tapered portion 22 is made up of a rope 22a, a rope passage portion 22b (see Figure 3(c)), a slit 22c, a rope ratchet 22d, and a hook 22e.

[0024] 3(c), the upper end of the tubular portion 20 is woven and sewn inside, forming a space (rope-passing portion 22b) through which the rope 22a can be passed inside the tubular portion 20. The rope 22a passes through the rope-passing portion 22b, and both ends of the rope 22a are passed out through slits 22c provided in the tubular portion 20.

[0025] Two slits 22c are provided at approximately the same height as the rope-passing section 22a so as not to overlap with the second flap 21b. The rope 22a pulled out from one slit 22c is passed through a rope ratchet 22d, and a hook 22e is attached to the rope 22a pulled out from the other slit 22c.

[0026] Next, a gas leak repair method using the light blocking sheet 1 according to this embodiment will be described.

[0027] The worker opens the first opening / closing portion 12 and the second opening / closing portion 21 of the shading sheet 1, and places the shading sheet 1 over the gas circuit breaker 3 so that the bushing 31 is wrapped around the opening 11. In other words, the bushing 31 is lightly wrapped around the tubular portion 20. In this state, the worker attaches the second flap 21b to the second hook-and-loop fastener 21c from the outside of the shading sheet 1, and temporarily fastens the tubular portion 20 to the bushing 31.

[0028] After the temporary fastening work, the worker arranges the light-shielding sheet 1 so that the gas leak location is shielded from light and so that both ends of the first fastener line 12a can be aligned.

[0029] Thereafter, the worker closes the first line fastener 12a on the outside (surface) of the shading sheet 1 from one side of the sheet body 10 toward the opening 11. Next, the worker temporarily peels off the second flap 21b that has been attached to the second surface fastener 21c, and closes the second line fastener 21a up to the upper end of the tubular portion 20. Then, the second flap 21b is again attached to the second surface fastener 21c.

[0030] Next, the worker attaches the first flap 12b to the first surface fastener 12c on the back side (rear surface) of the shading sheet 1, thereby covering the back side of the first line fastener 12a.

[0031] Additionally, the worker hooks the hook 22e onto the rope ratchet 22d on the outside of the shading sheet 1 and pulls the rope 22a on the outlet side of the rope ratchet 22d, thereby causing the narrowing portion 22 to bite into the groove of the bushing 31.

[0032] 4(a) is a photograph showing the vicinity of the opening 11, and FIG. 4(b) is a photograph showing the entire shading sheet 1. As can be clearly seen from FIG. 4(a), when the above work is completed, the narrowed portion 22 is embedded in the groove of the bushing 31, and the gas circuit breaker 3 is covered with the shading sheet 1.

[0033] Finally, the string tied to the multiple grommets 10a is fixed to any location on the gas circuit breaker 3 or scaffolding, completing the light-shielding curing of the gas leak location. This prevents strong light (direct sunlight) from hitting the repair location (gas leak location). In this state, the worker performs the gas leak repair work using an ultraviolet-curing repair agent.

[0034] In conventional work, workers were required to use multiple sheets to surround bushing 31 for light-blocking protection, making the work complicated, but the gas leak repair method using light-blocking sheet 1 according to the present invention makes the work easier by allowing light-blocking protection with just one sheet of light-blocking sheet 1. In other words, light-blocking protection can be achieved by opening the first and second opening / closing parts of light-blocking sheet 1, wrapping opening 11 around bushing 31, and then closing the first and second opening / closing parts, thereby reducing the labor required.

[0035] Furthermore, by using the shading sheet 1 according to the present invention, the worker can firmly fix the shading sheet 1 to the bushing 31 by squeezing the drawing portion 22 along the groove of the bushing 31 and making it bite into the bushing 31. This process significantly stabilizes the positioning of the shading sheet 1, and the sheet will not shift when the eyelets 10a are pulled with a string. Conventionally, when shading curing is performed using multiple sheets, there is always a risk that the positioning of each sheet will shift, making it complicated.

[0036] Here, because the drawn portion 22 is provided on the tubular portion 20 rather than on the sheet main body 10, wrinkles that occur when the drawn portion 22 is inserted into the bushing 31 can be absorbed by the tubular portion 20, making it less likely that wrinkles will occur in the sheet main body 10. This makes it easier to handle the shading sheet 1 after the drawn portion 22 is fixed. Specifically, this makes it easier to fix the four sides of the shading sheet to any location on the gas circuit breaker 3 or scaffolding using the grommets 10a while adjusting the overall shape of the shading sheet 1.

[0037] The first and second opening / closing sections are provided with a first flap 12b and a second flap 21b, respectively. The first and second flaps 12b and 21b can cover the first and second fastener strips 12a and 21a, respectively, and can prevent light leaking through the seams of the first and second fastener strips 12a and 21a from penetrating inside the light-blocking sheet 1, thereby further improving the light-blocking properties.

[0038] Here, the second flap 21b is provided on the outside of the tubular portion 20. With this configuration, the worker can first attach the second flap 21b to the second hook-and-loop fastener 21c, thereby temporarily fastening the tubular portion 20 to the bushing 31. This temporary fastening allows the worker to easily unfold the shading sheet 1 and close the first opening / closing portion 12 and the second opening / closing portion 21 thereafter. [Explanation of symbols]

[0039] 1 Blackout sheet 10 Seat body 10a eyelet 11 Opening 12 First opening and closing section 12a First Line Zipper 12b First flap 12c First hook-and-loop fastener 20 Cylinder part 21 Second opening and closing section 21a 2nd line zipper 21b Second flap 21c Second hook-and-loop fastener 22 Constriction section 22a Rope 22b Rope hole 22c slit 22d Rope Ratchet 22e hook 3. Gas circuit breaker 31 Bushing 32 overhead lines

Claims

1. A light-shielding sheet used to repair gas leaks in gas circuit breakers, The seat body, an opening formed in the sheet body for winding around a bushing of the gas circuit breaker; a first opening / closing portion that connects one side of the seat body to the opening; A light-blocking sheet comprising:

2. a cylindrical portion joined along the edge of the opening and wound around the bushing; The cylindrical portion includes a second opening / closing portion that is connected from the upper end to the lower end of the cylindrical portion, 2. The light-shielding sheet according to claim 1, wherein the first opening / closing portion and the second opening / closing portion are continuously connected.

3. 3. The light-shielding sheet according to claim 2, wherein the cylindrical portion has a narrowing portion that narrows the upper end of the cylindrical portion.

4. A method for repairing a gas leak in a gas circuit breaker using the light-shielding sheet according to claim 1, A gas leak repair method characterized by wrapping the opening around the bushing, closing the first opening / closing part, and covering the gas circuit breaker with the light-shielding sheet, and then repairing the gas leak location using an ultraviolet-curing repair agent.

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