Monitoring device for electrical equipment and electrical equipment comprising same

Abstract

The invention relates to a monitoring device for electrical equipment and the electrical equipment comprising the same. The electrical equipment comprises a shell with at least one hole formed in the wall, and a monitoring device is installed on the outer side of the shell so as to monitor the internal condition of the shell through the hole. The monitoring device comprises a camera and a light supplementing lamp which are adjacent to the ground and face the corresponding holes. The observation window covers the hole, is mounted among the hole, the camera and the light supplementing lamp and comprises a first transparent part and a second transparent part; and the camera and the light supplementing lamp can shoot and illuminate the interior of the shell through the first transparent part, the second transparent part and the corresponding hole respectively. The observation window further comprises a non-transparent part, and the non-transparent part is arranged between the first transparent part and the second transparent part so as to absorb or block at least one part of light which is emitted from the light supplementing lamp and reflected by the observation window towards the camera. The monitoring device provided by the invention can reduce the adverse effect on the image quality of the camera by the illumination light of the light supplement lamp reflected to the camera side by the observation window.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment, and more specifically to a monitoring device for electrical equipment. Background Technology

[0002] Many electrical devices, such as switchgear, require real-time or dynamic monitoring of the various conditions of their internal components. For example, switchgear often has disconnecting switches (such as a typical three-position switch) installed in its gas box. During operation and maintenance, the position and status of the disconnecting switch affect the safety and stability of operation and maintenance. For instance, if the three-position switch is not reliably grounded during maintenance, it may pose a personal danger to maintenance personnel. Therefore, it is generally necessary to monitor the working status of the disconnecting switch at all times to detect switch faults in a timely manner and avoid affecting the normal operation of the switchgear and related power systems. One existing solution for monitoring is to use a camera to capture images of the inside of the switchgear. Since the interior of switchgear is generally not well-lit, the monitoring device is often equipped with supplementary lighting near the camera to provide illumination inside the switchgear.

[0003] Considering the space constraints inside the switchgear and the airtightness requirements of certain types of switchgear (such as gas-insulated metal-enclosed switchgear / GIS), as well as the ease of maintenance of monitoring devices such as cameras and supplementary lights, the monitoring devices are often installed on the outside of the switchgear, and holes covered with transparent observation windows are opened in the wall of the switchgear housing, so that the cameras and supplementary lights can take pictures and illuminate the inside of the switchgear through the transparent observation windows and holes.

[0004] However, it has been found that in the existing monitoring devices described above, the images captured by the cameras are often not clear enough or have areas of blurred light and shadow, making it difficult to see or identify the internal condition of the switch cabinet from the monitoring images. Summary of the Invention

[0005] The purpose of this invention is to solve the above-mentioned problems and / or other defects existing in the prior art.

[0006] Through careful research, the inventors realized that the poor image quality captured by cameras in existing monitoring devices stems from the fact that the illumination light emitted by the supplementary lighting must pass through a transparent observation window mounted on the outer side of the switch cabinet before entering the cabinet through holes in the cabinet's casing. However, when the illumination light hits and passes through the observation window, it inevitably reflects off the outer and inner surfaces of the window. At least a portion of this reflected light inevitably hits the camera positioned near the supplementary lighting, interfering with the camera's image capture and resulting in poor image quality. Based on this discovery, the present invention conceives of improving camera image quality by suppressing the illumination light emitted from the supplementary lighting and reflected towards the camera through the transparent observation window.

[0007] Specifically, one aspect of the present invention provides a monitoring device for electrical equipment, the electrical equipment including a housing with at least one hole in its wall, the monitoring device being configured to be mounted on the outside of the housing to monitor the internal condition of the housing through the hole. The monitoring device includes: a camera and a supplementary light, the camera and the supplementary light being disposed adjacent to each other on the ground and facing their respective corresponding holes; and an observation window configured to cover the hole and mounted between the hole and the camera and the supplementary light, the observation window including a first transparent portion and a second transparent portion, the camera and the supplementary light being capable of photographing and illuminating the interior of the housing through the first transparent portion, the second transparent portion, and their respective corresponding holes. The observation window also includes an opaque portion disposed between the first transparent portion and the second transparent portion to absorb or block at least a portion of light emitted from the supplementary light and reflected by the observation window toward the camera.

[0008] According to the above-described solution of the present invention, an opaque portion is provided between two transparent portions of the observation window installed on the outer side of the housing wall of the electrical equipment, corresponding to the camera and the supplementary light, respectively. The opaque portion can absorb or block at least a portion of the illumination light emitted from the supplementary light and reflected by the observation window toward the camera, thereby reducing the adverse effects of the illumination light from the supplementary light reflected by the observation window (especially the inner or bottom interface of the observation window) on the image captured by the camera, improving image quality, and thus improving the accuracy and ease of identification of the internal condition of the electrical equipment housing by the monitoring device.

[0009] According to an exemplary embodiment of the present invention, the opaque portion includes an opaque coating applied to the outer surface of the observation window, the opaque coating being located between a first projection area of ​​the supplementary light on the outer surface of the observation window and a second projection area of ​​the camera on the outer surface. With this configuration, the opaque portion can be easily formed by applying a coating to the outer surface of the observation window.

[0010] According to an exemplary embodiment of the present invention, the opaque coating is in the form of a strip, which is substantially perpendicular to the arrangement direction of the first projection area and the second projection area, and the width of the strip is set to be more than 30% of the gap between the first projection area and the second projection area in the arrangement direction. An opaque coating applied in this manner can achieve good light absorption or blocking effects with a simple configuration.

[0011] According to an exemplary embodiment of the present invention, the monitoring device further includes a baffle disposed between the fill light and the camera to block or absorb at least a portion of the light emitted from the fill light and reflected towards the camera by the viewing window. By disposing of the baffle between the fill light and the camera, at least a portion of the illumination light emitted from the fill light and reflected towards the camera by the viewing window (especially the outer interface of the viewing window) can also be blocked or absorbed, thereby reducing the adverse effects of the fill light on the images captured by the camera.

[0012] According to an exemplary embodiment of the present invention, the baffle is configured to press against the outer surface of the viewing window. This configuration of the baffle prevents the illumination light from directly reaching the camera side between the baffle and the viewing window, further reducing the adverse effects on the camera image.

[0013] According to an exemplary embodiment of the present invention, the supplementary light and the camera are housed and mounted in a common housing, and are mounted on the outside of the housing via the housing. This common housing simplifies the installation and maintenance of the supplementary light and the camera and improves the compactness of the monitoring device.

[0014] According to an exemplary embodiment of the present invention, a sealing ring is provided between the observation window and the wall of the housing, surrounding the hole, so that the observation window sealably covers the hole. The sealing ring's ability to seal the hole ensures the airtightness of the electrical equipment housing, making the monitoring device particularly suitable for electrical equipment requiring airtightness.

[0015] According to an exemplary embodiment of the present invention, the monitoring device further includes a pressure plate disposed between the supplementary light and the camera and the observation window, and pressing the observation window firmly against the wall of the housing. This pressure plate provides protection for the observation window during installation and normal operation, and also strengthens the observation window, which typically has limited material strength, preventing damage to the observation window and the external environment that may be caused by the internal operating conditions of electrical equipment.

[0016] Another aspect of the present invention provides an electrical device comprising: a housing having at least one hole in its wall; and a monitoring device according to any one of the preceding claims, the monitoring device being configured to be mounted on the outside of the housing to monitor the internal condition of the housing through the hole.

[0017] According to an exemplary embodiment of the present invention, the housing is an airtight housing filled with insulating gas. The monitoring device according to the present invention can be easily and sealingly installed on the outside of the housing relative to the electrical equipment housing. The installation, maintenance, or replacement of the monitoring device will not affect the airtightness of the electrical equipment housing. It is particularly suitable for electrical equipment including airtight housings filled with insulating gas, such as GIS switch cabinets. Attached Figure Description

[0018] The features and advantages of the present invention will become clear from the detailed description provided below with reference to the accompanying drawings. It should be noted that the following drawings are merely schematic and not necessarily drawn to scale, and therefore should not be considered as limitations on the invention, wherein:

[0019] Figure 1 This is a perspective view of a monitoring device installed on the outside of the housing of an electrical device according to an embodiment of the present invention.

[0020] Figure 2 From Figure 1 A 3D view of the electrical equipment casing after the monitoring device has been removed.

[0021] Figure 3 yes Figure 1 A 3D view of the monitoring device from another angle.

[0022] Figure 4 yes Figure 3 The monitoring device shown is viewed from below.

[0023] Figure 5 yes Figure 3 The image shown is a 3D view of the monitoring device from the bottom after the viewing window has been removed.

[0024] Figure 6 yes Figure 1 A 3D view of the surveillance equipment after the boxes used to house the cameras and fill lights have been removed.

[0025] Figure 7 yes Figure 3 The image shown is a 3D view of the monitoring device after the housing for the camera and fill light has been removed.

[0026] Figure 8 yes Figure 7The image shows a 3D view of the monitoring device after the mounting mechanisms for the cameras and supplementary lights have been further removed.

[0027] Figure 9 yes Figure 1 The diagram shows a perspective view of the monitoring device with the observation window installed on the outside of the electrical equipment housing.

[0028] Figure 10 From Figure 1 After removing the cameras, supplementary lights, and housings of the monitoring devices, only the view of the pressure plate covering the observation window and mounted on the outside of the electrical equipment's casing is visible.

[0029] Figure 11 yes Figure 9 The enlarged view of the observation window shown.

[0030] Figure 12 yes Figure 10 The observation window shown is a three-dimensional view from the bottom side.

[0031] Figure 13 This is an enlarged perspective view of an observation window based on another exemplary configuration. Detailed Implementation

[0032] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the invention. However, it will be apparent to those skilled in the art that implementation of the invention may not include some of these specific details. Furthermore, it should be understood that the invention is not limited to the specific embodiments described. Rather, the invention can be conceived to be practiced with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0033] Figure 1A general schematic diagram of a monitoring device 100 according to an embodiment of the present invention and electrical equipment including thereof or applied thereto is shown. The electrical equipment may include a housing 200 defining a compartment of the electrical equipment for accommodating components requiring monitoring. It should be noted that the electrical equipment may also include other housings besides housing 200 to define other compartments of the electrical equipment. For example, for a GIS switchgear, housing 200 may only define its gas box (inflatable compartment), and may also include additional housings defining other compartments. The monitoring device 100 is mounted on the outside of housing 200 (more specifically on the outside of one of the walls 201 of housing 200 in the illustrated embodiment), which facilitates convenient maintenance or replacement of the monitoring device without unduly occupying internal space of housing 200.

[0034] In order for the monitoring device 100 located outside the housing 200 to monitor the interior of the housing 200, such as Figure 2 As shown, at least one hole (two exemplary holes 202 and 204 in the illustrated embodiment) is provided on the wall 201 of the housing 200 where the monitoring device 100 is installed. The monitoring device 100 can monitor the internal condition of the housing 200 (such as the working status of internal components) through the at least one hole.

[0035] like Figure 3-8 As shown, the monitoring device 100 includes a camera 20, which is positioned facing a corresponding hole 202 on the housing wall 201 to capture images of the interior of the housing 200 through the hole 202. Furthermore, considering that the interior of the housing 200 is often dimly lit, the monitoring device 100 also includes a supplementary light 40 adjacent to the camera 20, which faces another corresponding hole 204 on the housing wall 201 to emit illumination light into the interior of the housing 200 through the hole 204, providing sufficient light for the camera 20 to capture images. Those skilled in the art will understand that the holes 202 and 204 corresponding to the camera 20 and the supplementary light 40 can also be combined into a single, larger hole.

[0036] The camera 20 and the supplementary light 40 can be housed in a common housing 90 and mounted on the outside of the housing 200 by means of the housing 90. More specifically, the camera 20 and the supplementary light 40 can first be mounted into the housing 90 by their respective mounting mechanisms (such as brackets, supports, etc.) 92, 94, with the housing 90 providing positioning, fixation, and protection, and then uniformly mounted to an appropriate position on the outside of the housing 200 by means of the housing 90. For example, the housing 90, which houses the camera 20 and the supplementary light 40, can be directly mounted to the wall of the housing 200 by means of protrusions 93 extending from its main body, for example by fasteners, or indirectly mounted to other structures with a fixed positional relationship relative to the housing 200. Using this housing 90 simplifies the installation and maintenance of the camera 20 and the supplementary light 40 and improves the compactness of the entire monitoring device 100.

[0037] The camera 20 and the supplementary light 40 can be selected with appropriate types and parameters according to monitoring needs. As an example, the following camera parameters can be used: resolution: ≥1280*720; viewing angle: long side FOV ≥120°; network protocol: TCP / IP, DHCP, HTTP, UPNP, RTSP, ONVIF; image storage capacity: ≥8GB; power supply: POE (IEEE 802.3af, IEEE 802.3at); power consumption: ≤5W; operating temperature and humidity: -25~55℃, 20%~80% non-condensing humidity. For example, the supplementary light can be a white LED with a beam divergence angle of not less than 120°.

[0038] The interior and exterior of the electrical equipment housing 200 may adversely affect each other through openings 202 and 204 in its walls. For example, foreign objects outside the housing may enter the interior through the openings, and insulating gas inside the housing, which requires airtightness, may leak to the outside through the openings. To avoid these adverse situations, such as... Figure 4 , 9 As shown in Figure 10, the monitoring device 100 also includes an observation window 50 located between the camera 20 and the supplementary light 40 and the portion of the housing wall 201 with the holes. The observation window 50 is configured to cover the holes 202 and 204 mounted on the housing wall 201, thereby providing at least a certain degree or level of physical obstruction to the holes. Of course, the observation window 50 does not affect the camera 20 and the supplementary light 40's ability to capture and illuminate the interior of the housing. To this end, the observation window 50 may include a first transparent portion 52 and a second transparent portion 54 corresponding to the camera 20 and the supplementary light 40, respectively, through which the camera 20 and the supplementary light 40 can capture and illuminate the interior of the housing 200.

[0039] In one embodiment, such as Figure 11 and12 As shown, the observation window 50 can be formed from a single piece of transparent material, such as an acrylic (i.e., plexiglass) sheet, and the first and second transparent portions 52 and 54 are two juxtaposed areas of the sheet facing the camera 20 and the supplementary light 40, respectively. Of course, the observation window 50 can also be made of any other suitable material or one or more materials, as long as it meets the required strength requirements and has two transparent portions.

[0040] In the illustrated embodiment, the viewing window 50 has multiple through holes 51, and can be mounted on the wall 201 of the housing 200 using corresponding fasteners (such as bolt / nut assemblies) 70 passing through these through holes. Of course, any other method (such as adhesive bonding, snap-fit ​​connection, etc.) can be used to mount the viewing window 50 to the housing 200, depending on the material and shape of the viewing window 50, as long as the required mounting strength is achieved.

[0041] In one embodiment, for example, Figure 7 , 8 As shown in Figure 10, a pressure plate 60 can also be provided on the outside of the observation window 50 (the side facing away from the housing 200) to press the observation window 50 tightly onto the wall 201 of the housing 200. The pressure plate 60 covers the observation window 50, providing protection against external wear. Each fastener 70 can indirectly and evenly apply a fastening force to the observation window 50 through the pressure plate 60. The housing 90 can also indirectly abut against the observation window 50 during installation via the pressure plate 60 (see Figure 10). Figure 3 This prevents the fasteners 70 and the housing 90 from directly pressing against the observation window 50 and causing damage. The pressure plate 60 also enhances the strength of the observation window 50 (which is typically made of materials with limited strength) to prevent damage to the observation window and the outside environment that might occur due to the internal operating conditions of the electrical equipment (e.g., preventing arcing inside the switchgear from breaking through the observation window). Through holes 62 and 64, corresponding to the camera 20 and the supplementary light 40 respectively, can be provided on the pressure plate 60 to avoid obstructing the camera's view and the supplementary light's light. Those skilled in the art will understand that the pressure plate 60 is not essential; if the observation window 50 itself is made of a sufficiently strong material, the pressure plate 60 can be omitted.

[0042] Optionally, sealing rings 32 and 34 may be provided around the holes 202 and 204 between the observation window 50 and the wall 201 of the housing 200 (see...). Figure 4 This achieves a sealed installation of the observation window 50 relative to the housing 200, making the monitoring device 100 suitable for electrical equipment requiring airtightness (such as GIS switchgear). Therefore, as... Figure 11 and 12As shown, grooves 72 and 74 for receiving sealing rings 32 and 34 are formed on the inner or bottom side (the side facing the housing 200) of the observation window 50, respectively.

[0043] As described above, the camera 20 and the supplementary light 40 monitor and illuminate the interior of the electrical equipment housing 200 through the observation window 50, respectively. However, the inventors discovered through research that the illumination light emitted from the supplementary light into the housing will inevitably be reflected on the observation window when it shines on and passes through it. More specifically, see... Figure 11 The observation window 50 is on its outer surface ( Figure 11 The upper surface and the inner or bottom surface (in) Figure 11 At the bottom surface (opposite to the top surface), there are interfaces with other media (such as outside air) (referred to in this paper as the outer interface and the inner or bottom interface). The illumination light from the fill light will be reflected at these interfaces, and at least part of the reflected illumination light will inevitably hit the camera placed near the fill light, thus causing light interference to the camera's shooting, which is the reason for the deterioration of the camera image quality.

[0044] Therefore, the monitoring device according to the present invention is configured to suppress illumination light emitted from the supplementary light 40 and reflected towards the camera 20 by the observation window 50, thereby improving the image quality of the camera. More specifically, the observation window 50 in the monitoring device 100 is designed to include an opaque portion located between the first and second transparent portions 52 and 54, in addition to the first and second transparent portions 52 and 54. Since the first and second transparent portions 52 and 54 are positioned facing the camera 20 and the supplementary light 40, respectively, the opaque portion located between the first and second transparent portions can absorb or block at least a portion of the illumination light emitted from the supplementary light 40 and reflected towards the camera 20 by the observation window 50, thereby reducing the adverse interference of the illumination light from the supplementary light to the camera 20.

[0045] In one embodiment, the opaque portion is configured as an opaque coating 53 applied to the outer surface of the viewing window 50, such as... Figure 11 As shown. Coating 53, due to its opaque nature, is able to absorb or block light incident upon it. The opaque coating 53 can be easily formed, for example, by applying a polyvinyl alcohol solvent to the outer surface of the viewing window 50, and is typically a black (RGB number (0,0,0)) coating with good light absorption or blocking effect as illustrated. Of course, opaque coatings formed of other materials are also possible, as long as they can absorb or block light incident upon them.

[0046] An opaque coating 53 is located between the first transparent portion 52 and the second transparent portion 54. More specifically, those skilled in the art will understand that when the supplementary light 40 projects perpendicularly to the outer surface of the viewing window 50, a projection area (referred to as the "first projection area") is generated on that outer surface, and when the camera 20 projects perpendicularly to that outer surface, a projection area (referred to as the "second projection area") is also generated on that outer surface. The opaque coating 53 is located on the outer surface of the viewing window 50 between the first and second projection areas to minimize obstruction of the illumination light of the supplementary light 40 and the field of view of the camera 20, and in particular, it is able to absorb or block the supplementary light illumination reflected from the inner or bottom interface of the viewing window 50 toward the location of the camera 20. Advantageously, the opaque coating 53 is... Figure 11 The diagram shows a simple strip-shaped structure, which is substantially perpendicular to the arrangement direction of the first and second projection areas. For Figure 11 In the rectangular observation window 50 shown, the first and second projection areas can be considered to be arranged along the extension direction of the long side of the rectangular plate. Therefore, the arrangement direction is generally consistent with the extension direction of the long side, and thus the extension direction of the strip is consistent with the extension direction of the short side of the rectangular plate. In addition, in order to ensure that the opaque coating 53 has sufficient light-absorbing or light-blocking area, the width of the strip can be set to more than 30% of the gap between the first and second projection areas in the arrangement direction, and more preferably more than half of the gap size.

[0047] The opaque portion 53 of the observation window 50 is not limited to the form of the opaque coating described above. Any opaque portion of any shape, size, and position disposed between the first transparent portion 52 and the second transparent portion 54, capable of at least partially absorbing or blocking illumination light emitted from the supplementary light 40 and reflected by the observation window toward the camera 20, is within the scope of this invention. For example, in another embodiment, such as Figure 13 As shown, the opaque portion can also be an opaque (e.g., treated black) block 53 formed integrally with the first transparent portion and the second transparent portion along the entire thickness of the viewing window 50 (e.g., by injection molding).

[0048] Furthermore, such as Figure 5As shown, the monitoring device 100 may further include a baffle 80 disposed between the camera 20 and the supplementary light 40. This baffle is also configured to block or absorb at least a portion of the light emitted from the supplementary light 40 and reflected towards the camera 20 by the viewing window 50. In particular, the baffle 80 is positioned such that it can block or absorb the supplementary light reflected towards the camera 20 from the outer interface of the viewing window 50. The baffle 80 may be made, for example, of an aluminum-zinc coated sheet with a thickness of 1-2 mm, and may also be fixed within the housing 90. Advantageously, when the baffle 80 is mounted with the housing 90 as... Figure 3 When installed on the pressure plate 60 or the observation window 50 as shown (in the absence of a pressure plate), the baffle 80 can press against the outer surface of the observation window 50. This includes both the case where the baffle 80 is indirectly pressed against the outer surface of the observation window 50 via the pressure plate 60, and the case where the baffle 80 directly presses against the outer surface of the observation window 50 (when the pressure plate 60 is not provided). For example, the baffle 80 can directly abut against the outer surface of the pressure plate 60 or the observation window 50 via its bottom edge 81, thereby pressing against the outer surface of the observation window 50. The purpose is to minimize or even eliminate the gap between the baffle 80 and the pressure plate 60 or the outer surface of the observation window 50, thus preventing the illumination light from the supplementary lighting lamp from directly reaching the camera side from between the baffle and the pressure plate or the observation window, thereby further reducing the adverse effects on the camera image.

[0049] like Figure 3 and 5 As shown, in addition to the bottom edge 81 of the baffle 80 abutting against the outer surface of the pressure plate 60 or the observation window 50, at least one bottom edge of the housing 90 can also abut against the outer surface of the pressure plate 60 or the observation window 50 via a sealing strip 95 to prevent dust and other impurities from entering the housing 90. In this way, the housing 90 forms a relatively enclosed space relative to the outside, and the baffle 80 installed inside the housing 90 can further divide the space inside the housing into two smaller enclosed spaces for accommodating the camera 20 and the fill light 40 respectively. These two smaller spaces do not interfere with each other and also have good sealing relative to the outside, providing good protection for both the camera 20 and the fill light 40.

[0050] In summary, by providing the aforementioned opaque portion on the observation window 50 and optionally providing a baffle 80 between the camera 20 and the supplementary light 40, the supplementary light reflected from the observation window to the camera side can be greatly reduced, thereby reducing the adverse effects of the supplementary light on the camera image, improving image quality, and further improving the accuracy and ease of identification of the internal condition of the electrical equipment housing by the monitoring device.

[0051] As described above, the monitoring device according to the present invention can be installed in a sealed manner relative to the housing of electrical equipment on the outside of the housing, so that the installation, maintenance or replacement of the monitoring device will not affect the airtightness of the electrical equipment housing. Therefore, it is particularly suitable for electrical equipment including airtight housings filled with insulating gas, such as GIS switch cabinets. Of course, the present invention is not limited to this. Any electrical equipment that can or needs to have a monitoring device including a camera and a supplementary light installed on the outside of the housing to monitor the internal condition of the housing can be subject to the present invention to improve the quality of the monitoring images.

[0052] Various modifications and variations can be made to the embodiments disclosed above without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art based on the practice of the invention disclosed in this specification. This specification and the examples disclosed herein should be considered illustrative only, and the true scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A monitoring device (100) for electrical equipment, said electrical equipment including a housing (200) having at least one hole (202, 204) in a wall (201) of said housing, said monitoring device (100) being configured to be mounted on the outside of said housing (200) to monitor the internal condition of said housing through said hole, said monitoring device comprising: A camera (20) and a fill light (40) are provided, which are positioned close to each other on the ground and facing their respective corresponding holes (202, 204); as well as An observation window (50) is configured to cover the holes (202, 204) and is installed between the holes and the camera (20) and the fill light (40). The observation window includes a first transparent portion (52) and a second transparent portion (54). The camera and the fill light can respectively capture images of and illuminate the interior of the housing (200) through the first transparent portion, the second transparent portion, and their respective holes (202, 204). The observation window (50) further includes an opaque portion (53), which is disposed between the first transparent portion (52) and the second transparent portion (54) to absorb or block at least a portion of the light emitted from the supplementary light (40) and reflected by the observation window (50) toward the camera (20).

2. The monitoring device (100) according to claim 1, characterized in that, The opaque portion (53) includes an opaque coating applied to the outer surface of the observation window (50), the opaque coating being located between a first projection area of ​​the supplementary light (40) on the outer surface of the observation window (50) and a second projection area of ​​the camera (20) on the outer surface.

3. The monitoring device (100) according to claim 2, characterized in that, The opaque coating is in the form of a strip, which is substantially perpendicular to the arrangement direction of the first projection area and the second projection area, and the width of the strip is set to be more than 30% of the gap between the first projection area and the second projection area in the arrangement direction.

4. The monitoring device (100) according to any one of claims 1 to 3, characterized in that, It also includes a baffle (80) disposed between the fill light (40) and the camera (20) to block or absorb at least a portion of the light emitted from the fill light and reflected towards the camera by the viewing window (50).

5. The monitoring device (100) according to claim 4, characterized in that, The baffle (80) is configured to press against the outer surface of the observation window (50).

6. The monitoring device (100) according to any one of claims 1 to 5, characterized in that, The fill light (40) and the camera (20) are housed and installed in a common housing (90) and mounted on the outside of the housing (200) via the housing (90).

7. The monitoring device (100) according to any one of claims 1 to 6, characterized in that, A sealing ring (32, 34) is provided between the observation window (50) and the wall (201) of the housing (200) around the hole (202, 204) so ​​that the observation window (50) sealably covers the hole.

8. The monitoring device (100) according to any one of claims 1 to 7, characterized in that, It also includes a pressure plate (60) disposed between the supplementary light (40) and the camera (20) and the observation window (50) and pressing the observation window against the wall (201) of the housing (200).

9. An electrical device comprising: The housing (200) has at least one hole (202, 204) on its wall (201); and The monitoring device (100) according to any one of claims 1 to 8 is configured to be mounted on the outside of the housing (200) to monitor the internal condition of the housing through the holes (202, 204).

10. The electrical equipment according to claim 9, characterized in that, The housing (200) is an airtight housing filled with insulating gas.

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