JPH11122726A - Inside inspecting device of sealed electric appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent previously degradations of the transmissive members of an inspecting device, by widening its inspecting scope, inside the inspecting device of an sealed electric appliance. SOLUTION: To an opening 21 of a container 2, an inspecting device main body 11 is attached rotatably and movably in its axial direction. In the inspecting device main body 11, a lighting optical path 16 and an inspecting optical path 17 are formed. When uninspecting inside the container 2, the respective optical paths 16, 17 are stored inside an adsorbent storing portion 24 to eliminate degradations of the transmissive materials of the optical paths 16, 17 caused by the decomposed gases generated in the container 2. When inspecting inside the container 2, squeezing the inspecting device main body 11 into the inside of the container 2, the optical paths 16, 17 are located in an observable place inside the container 2 to illuminate the inside by the lighting optical path 16 and observe the inside from the inspecting optical path 17. Since the inspecting device main body 11 is rotatable, is inspection area can be made wide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed electric device such as a gas insulated switchgear (GIS).
The present invention relates to an internal inspection device for visually inspecting the inside of a sealed electric device from the outside.

[0002]

2. Description of the Related Art FIG. 1 shows an example of a conventional sealed electric device having an internal inspection section. In FIG. 1, reference numeral 1 denotes a gas insulated switchgear, which includes an electric device 3 in a sealed metal container 2.
And SF6 gas 4 is sealed as an insulating gas. In this gas insulated switchgear 1, a viewing window 5 is provided for visually checking the state of the electric device 3. The viewing window 5 is provided with an opening 6 in the container 2 and the opening 6 is closed by a glass 7 which is a light transmitting member.

[0003]

In the above-described internal inspection device for a sealed electric device, the viewing range is limited because the observation window 5 is merely provided. In addition, when the place to be inspected is dark, if the inside is to be illuminated through the viewing window 5, reflection may occur on the glass 7 and the inside may not be seen.

Further, since glass is used for the viewing window, if an insulating gas is decomposed due to an arc generated inside the container, the decomposed gas deteriorates the glass surface.
Becomes cloudy with the passage of time, and cannot be observed in a good state. In addition, since the glass 7 has brittleness, the glass 7 may be broken when subjected to an impact force due to, for example, generation of an arc in an electric device, which lowers the mechanical strength of the container.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device for inspecting the interior of a sealed electric device, which has a wider inspection range, prevents deterioration of a light transmitting member of the inspection device, and does not lower the mechanical strength of the container. is there.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an opening provided in a container wall of a hermetically sealed electric device, and an opening which is held in the opening and which is used for inspecting the inside of the hermetically sealed electric device from outside the container. Inspection means for looking inside, comprising a lighting optical path for guiding light from the outside of the container to the inside of the container, and an inspection light path for guiding light from the inside of the container to the outside of the container. In each of the light paths, inspection means having a light transmitting member that shields the inside and outside of the container, and a member that holds the inspection means in the opening in an airtight and rotatable and axially movable manner, Checking means
At the time of non-inspection moved to the outside of the container, it is sealed from the adsorbent storage section for disposing the degraded gas adsorbent between the light transmitting member provided in each optical path of the inspection means and the inside of the container at the time of non-inspection. Construct an internal inspection device for electrical equipment.

According to this inspection device, at the time of inspection, the inspection device main body is moved so that each optical path provided in the main body is located inside the container from the adsorbent storage section. Then, in this state, light is irradiated from the outside of the container to the inside of the container from the lighting optical path, and the state of the electric device is observed from the outside of the container through the inspection optical path. At this time, since the inspection device main body is rotatable, the visible range can be changed to widen the range that can be inspected.

[0008] When the inspection is completed, the inspection device body is moved to position the optical path in the adsorbent storage section. Thus, the gas that has passed through the deteriorated gas adsorbent comes into contact with the light transmitting material in the light path, so that the light transmitting member is not deteriorated by the decomposition gas. Even when an impact force is generated inside the container due to an arc or the like, the presence of the adsorbent storage portion prevents the impact force from being directly applied to the light transmitting material, so that the mechanical strength of the container is not reduced.

According to another aspect of the present invention, there is provided an opening provided in a container wall of a sealed electric device, and an inspection which is held by the opening and allows the inside of the sealed electric device to be viewed from outside the container when inspecting the inside. Means, the inspection means is formed of two members, one member is a member held in the opening, the other member is detachably attached to the one member and the outside of the container, And, has a light path for lighting that guides light from outside the container to the inside of the container, and a light path for inspection that guides light from inside the container to the outside of the container, and in each of the light paths, Inspection means having a light transmitting material for blocking the inside and outside of the container,
A member for holding the inspection means in the opening in an airtight manner, rotatably and movably in the axial direction constitutes an internal inspection device of the sealed electric device.

According to this inspection device, at the time of inspection, the two members are integrated to assemble the inspection device main body and inspect the inside of the container. At this time, since the inspection device main body is rotatable, the visible range can be changed to widen the inspection range. When the inspection is completed, the member having the light path is removed, and only the remaining members are held in the opening of the container. Therefore, at the time of light inspection, the light path does not come into contact with the gas inside the container, so that there is no deterioration of the light transmitting member, and there is no portion that is weak to impact force.

[0011]

Embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 2 is a sectional view showing a first embodiment of the inspection device of the present invention. In FIG. 2, reference numeral 11 denotes an inspection device main body, which is formed in a cylindrical shape, and flanges 12 and 13 are formed at both ends. Although not shown, the two flanges 12,
At least one of 13 is detachably attached to the inspection device main body 11. An annular groove 14 is formed on the outer periphery of the flange 12 disposed inside the container 2, and an O-ring 15 is fitted therein. A temporary lid 18 is detachably attached to the flange 13 arranged outside the container 2. Further, an O-ring 19 is provided to keep the airtightness between the flange 13 and the temporary lid 18.

A light path 16 for lighting and a light path 17 for checking are formed inside the inspection apparatus main body 11. Details of each of the optical paths 16 and 17 will be described later. A circular opening 21 is formed in the container 2 for mounting the inspection device main body 11. An annular groove 22 is formed on the inner periphery of the opening 21.
Is formed, and the O-ring 23 is fitted therein. The body of the inspection device 11 is inserted into the opening 21 and is supported so as to be movable in the axial direction and rotatable. O-ring 23 between the inside and outside of opening 21
Keeps hermeticity.

The inspection device body 1 is provided inside the container 2 at the opening 21.
An adsorbent storage section 24 is provided so as to surround the outside of the first adsorbent. The adsorbent storage section 24 has a cylindrical outer shape, and stores therein the deteriorated gas adsorbent 25 therein. Activated carbon or the like can also be used as the deteriorated gas adsorbent 25.
The adsorbent storage section 24 has a concave portion 27 at the front end inside the container where the flange 12 of the inspection device main body 11 is engaged, and the O-ring 1 is provided between the adsorbent storage section 24 and the inside of the container 2.
5 sealed. The adsorbent storage section 24 has a hole 26 formed inside the container 2. The hole 26 is provided in a portion for storing the deteriorated gas adsorbent 25. Therefore, the inside of the container 2 and the inside of the adsorbent storage section 24 communicate with each other via the deteriorated gas adsorbent 25.

Here, the optical paths 16 and 17 formed in the inspection device main body 11 will be described. Both light paths 16,1
Numeral 7 opens in the axial direction of the main body 11 outside the container 2 and opens in the side surface of the main body 11 inside the container. Light 9 on the way
Mirrors 28 and 28 for bending by 0 degree and glasses 29 and 29 for blocking the inside and outside of the container 2 are inserted. A fisheye lens 30 is attached to the opening inside the container of the inspection light path 17 to widen the inspection range.
0 can be omitted. Note that the illustrated optical paths 16,
17 is bent at right angles by the mirrors 28, 28, but this angle is not limited to a right angle, and may be any angle.

Next, the usage of the inspection device will be described. In FIG. 2, a portion drawn by a solid line indicates a state at the time of non-inspection, and a portion drawn by a two-dot chain line indicates a state at the time of inspection. At the time of non-inspection, the inspection device main body 11
It is in the state pulled out of the outside. At this time, the flange 12 inside the container of the inspection device main body 11 is
4 is engaged with the concave portion 27 at the tip of
The opening inside the container 7 is located in the adsorbent storage section 24.

Therefore, even if a decomposed gas is generated in the container 2, the degraded gas is discharged through the hole 26 and the degraded gas adsorbent 25.
Through the optical paths 16 and 17. As a result, the deteriorated gas is adsorbed by the deteriorated gas adsorbent 25, so that the light transmitting material such as the mirrors 28, 28, the glasses 29, 29, and the lens 30 of the optical paths 16, 17 does not deteriorate.

Even if an impact force is generated by an arc or the like inside the container 2, the impact force is directly applied to the mirrors 28, 28, the glasses 29, 29, and the lens 30 because the diameter of the hole 26 is small.
And the light transmitting material is not destroyed. Therefore, even if the inspection device is provided, the mechanical strength of the container 2 does not decrease. When inspecting the inside of the sealed electric device, the temporary lid 18 is removed, and the inspection device main body 11 is pushed toward the inside of the container 2. As a result, as shown by the two-dot chain line in FIG. 2, the two optical paths 16 and 17 are separated from the adsorbent storage section 24 and open inside the container. In this state, when light is incident on the lighting optical path 16 from the outside of the container by an appropriate light source, the light passes through the optical path 16, is reflected by the mirror 28, is emitted to the outside of the path, and illuminates the inside of the container 2. The state inside the container 2 illuminated with this light can be observed outside through the inspection light path 17. This observation can be performed with the naked eye, or can be performed by attaching a CCD camera or the like to the optical path 17.

Since the inspection device main body 11 is rotatably supported, by rotating the main body 11, the light irradiation place and the observation place can be changed, and a desired place in the container 2 can be inspected. it can. Further, since the light path 16 for writing and the light path 17 for inspection are provided separately, the writing light is not reflected in the light path 17 for inspection, so that the inspection is not disturbed.

When this inspection is completed, the inspection device body 11
Is moved to the outside of the container again, and brought into the state shown by the solid line in FIG. As a result, the optical paths 16 and 17 are opened in the deteriorated gas adsorbent accommodating section 24, so that the optical paths
Mirrors 28, 28 and glass 29, 2 provided on 17
9. The light transmitting material such as the lens 30 only touches the gas in the container 2 for a short time during inspection. Therefore, even if the decomposed gas is present in the container 2, the time during which the light transmitting material touches the decomposition gas is extremely short, and the light transmitting material does not deteriorate.

Normally, in closed electric equipment,
Since the internal gas pressure is higher than the atmospheric pressure,
The inspection device main body 11 is held at the position indicated by the solid line in FIG. 2 due to the pressure difference between the inside and the outside of the inspection device.
It is optional to provide a suitable stopper on the body 11 so that the body 11 does not accidentally move inside the container. (Embodiment 2) FIG. 3 shows a sectional view of a second embodiment of the inspection device of the present invention. 3, components having the same functions as those in FIG. 2 described above are denoted by the same reference numerals, and redundant description will be omitted in the following description.

In this embodiment, the inspection device main body 31 is composed of two parts that can be detached from each other. One is an airtight lid 32 that is held by the opening 21 of the container 2 and closes the opening 21 at the time of non-inspection, and the other is an inspection rod 33 having the optical paths 16 and 17. The airtight lid 32 and the inspection rod 33 can be integrated and separated by a bolt 34 and a nut 35. In addition, the airtight lid 32 and the inspection rod 33 have the same body diameter and have a single rod shape when integrated. FIG. 3 shows a state in which both are separated.

The airtight lid 32 has a flange 12 formed on a portion arranged inside the container 2 and a bolt 34 for attaching an inspection rod 33 to a portion arranged outside the container 2. In addition, a through hole 3 is formed in the side surface of the airtight lid 32 in the diameter direction.
7 is formed, and the stopper pin 36 can be inserted and removed. At the time of non-inspection, the stopper pin 36
The airtight lid 32 is held in the opening 21 of the container 2 by the flange 12 and the stopper pin 36, and is prevented from dropping into the container. FIG. 4 shows a perspective view of the airtight lid 32.

The inspection rod 33 has a nut 35 to be attached to the airtight lid 32 at the tip disposed inside the container 2, and optical paths 16 and 17 formed therein. The configurations of these optical paths 16 and 17 are the same as in the first embodiment. In this example, the temporary cover 18 shown in FIG. 2 is not provided. A usage mode of the inspection device of the present example will be described.

At the time of inspection, the airtight lid 32 and the inspection rod 33 are connected by bolts 34 and nuts 35, and the inspection device main body 3
1 is formed, and the stopper pin 36 is pulled out of the through hole 37. Thus, the inspection device main body 31 can be pushed into the container 2 as in the first embodiment, and the openings of the optical paths 16 and 17 are located in the container 2. Accordingly, similarly to the first embodiment, the inside of the container 2 can be lit and the inspection work inside can be advanced.

After the inspection is completed, the inspection device main body 31 is
The stopper pin 36 is inserted into the through hole 37 and the airtight lid 32 is fixed to the container 2. In this state, the inspection rod 33 is removed from the airtight lid 32.
In this example, similarly to Embodiment 1 described above, at the time of inspection, internal inspection can be performed while writing is performed, and at this time, the observation position can be changed by rotating the inspection device main body 31. When the inspection is not performed, the inspection rod 33 having the optical paths 16 and 17 is removed, so that the light transmitting materials such as the glasses 28 and 28, the lenses 29 and 29, and the lens 30 do not come into contact with the decomposition gas. Therefore,
The deteriorated gas adsorbent 25, the adsorbent storage unit 24, and the temporary cover 18 provided in the inspection device of the first embodiment can be omitted.

[Brief description of the drawings]

FIG. 1 is a diagram showing the configuration of a conventional sealed electric device having a viewing window.

FIG. 2 is a diagram showing a configuration of a first embodiment of an inspection device for a sealed electric device according to the present invention.

FIG. 3 is a diagram showing a configuration of a second embodiment of the inspection device for a sealed electric device according to the present invention.

FIG. 4 is a perspective view of an airtight lid in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... GIS 2 ... Container 3 ... Electric equipment 4 ... SF6 gas 5 ... Peep window 6 ... Opening 7 ... Glass 11 ... Inspection apparatus main body 12, 13 ... Flange 14 ... Groove 15 ... O-ring 16 ... Lighting path for lighting 17 ... Inspection Light path for use 18 ... Temporary lid 19 ... O-ring 21 ... Opening 22 ... Groove 23 ... O-ring 24 ... Adsorbent storage part 25 ... Deteriorating gas adsorbent 26 ... Evacuation hole 27 ... Recess 28 ... Mirror 29 ... Glass 30 ... Lens 31 ... Inspection device body 32 Airtight lid 33 Inspection rod 34 Bolt 35 Nut 36 Stopper pin 37 Through hole

Claims (2)

[Claims] 1. An opening provided in a wall of a container of a sealed electric device, and inspection means held by the opening, for inspecting the inside of the sealed electric device from outside the container when inspecting the inside of the sealed electric device, A light path for lighting that guides light from the inside of the container, and a light path for inspection that guides light from the inside of the lighted vessel to the outside of the container, and in each of the light paths,
Inspection means having a light transmitting member for blocking the inside and outside of the container, a member for holding the inspection means airtightly in the opening, and rotatably and axially movable; and A sealed electric device comprising an adsorbent storage section for disposing a degraded gas adsorbent between a light transmitting member provided in each light path of the inspection means and the inside of the container when the inspection apparatus is not inspected. Equipment for internal inspection of equipment. 2. An opening provided in a container wall of the sealed electric device, and inspection means held by the opening for inspecting the inside of the sealed electric device from outside the container when inspecting the inside, wherein the inspection means is It is formed of two members, one member is a member held in the opening, and the other member is detachably attached to the one member and the outside of the container, and is provided with light from the outside of the container. A light path for lighting that guides the light into the container, and a light path for inspection that guides the light from the inside of the container to the outside of the container, and a light transmitting member that blocks the inside and outside of the container in each of the light paths. And a member for holding the inspection means in the opening in an airtight manner, rotatably and movably in an axial direction.