JPH076650Y2 - Gas insulated switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a bushing retractable gas insulated switchgear installed in a snowfall area.

[Prior Art] In a bushing retractable gas-insulated switchgear installed in a snowfall area, when snow accumulates on the ceiling of the container near the bushing, a flashover occurs between the accumulated snow and the bushing terminal. May occur.

FIG. 8 shows an example of the construction of a bushing retractable gas insulated switchgear. In this example, a cylindrical container 3 is supported at one end of an installation base 1 via a pedestal 2 and shuts off inside the container 3. The switchgear and the switchgear such as earthing switch are stored. Branch pipes 3a and 3b are provided on the upper and lower sides of the container 3, respectively.
Is provided, and the bushing mounting container 4 is provided on the upper branch pipe portion 3a.
Has one end connected via an insulating spacer. One end of the bushing mounting container 5 is connected to the other end of the bushing mounting container 4, and one end of the bushing mounting container 6 is connected to the other end of the bushing mounting container 5 via insulating spacers. Installed base 1 via
Supported above. Bushings 12 to 14 are attached to nozzle portions 4a to 6a provided on the upper portions of the bushing attachment containers 4 to 6 via relay containers 9 to 11, respectively. A busbar container 15 is connected to the lower branch pipe portion 3b of the container 3 via an insulating spacer.
The support 15 is supported on the installation base 1 via a mount 16.
A bus bar conductor 15 is accommodated in the bus bar container 15, and the bus bar conductor is passed through a predetermined switching circuit in the container 3 to form the bushings 12 to 14.
It is connected to the. An operating device box 17 is attached to the side surface of the container 3 opposite to the bushing. SF ₆ gas is enclosed in the containers 3 to 6 and 15 at a predetermined pressure.

[Problems to be Solved by the Invention] In the bushing retractable gas-insulated switchgear in which the bushing 12 is arranged in the vicinity of the container 3 as described above, when snow 18 is accumulated on the container 3, 18 and bushing 12
There is a problem that a flashover 19 is generated between the terminal 12a and the terminal 12a.

In order to prevent snow accumulation on the container 3, a steeply sloping roof 20 is attached to the ceiling of the container 3 as shown in FIGS. 9 and 10. However, since the height of the steeply sloping roof is considerably high, in order to secure the insulation distance L between the roof and the terminal of the bushing 12, the length of the relay pipe 9 is lengthened to install the bushing 12 at the mounting position. It needs to be high. Also, no matter how steep the roof is, it does not slip off until a certain amount of snow is accumulated, so it is inevitable that some snow 18 will accumulate on the roof. Therefore, in anticipation of this snowfall, bushing 12
It was necessary to set the height of the terminal 12a of the device to a higher height, and it was unavoidable that the device became large.

Further, when a steeply sloping roof 20 is provided, the insulating distance between the terminal 12a of the bushing 12 and the roof 20 is also secured by moving the bushing 12 away from the container 3 as shown in FIG. However, in the case of such a configuration, it is necessary to increase the length of the bushing mounting container 4, so that it is inevitable that the device becomes large.

When a steeply sloping roof is installed as described above, the size of the device is inevitable, so there is a limit to the installation space for the gas-insulated switchgear and the height of the bushing terminals. If you can't install a steep roof. In that case, it is necessary to manually remove the snow when the amount of snow reaches a certain amount, but the ceiling of the container 3 is close to the terminals of the bushing, and it is a safety problem to perform the snow removal while the power is on. Because of this, there was a need for a power outage every time it snowed.

An object of the present invention is to provide a gas-insulated switchgear in which an overhead wire drawing bushing is disposed near a container accommodating a switchgear such as a circuit breaker, without increasing the size of the device. Another object of the present invention is to provide a gas-insulated switchgear that prevents snow accumulation.

[Means for Solving the Problems] In the present invention, in order to achieve the above object, a hollow snow cover is attached so as to cover the ceiling of a container, and a space heater is arranged in a space inside the snow cover. . The snow cover comprises a base plate fixed to the ceiling of the container, a roof plate that covers the base plate with a space, and a side plate that laterally closes the space between the roof plate and the base plate. In this case, the space heater is mounted on a heater mounting plate slidably supported on a guide rail fixed to the base plate. Then, a part of the side plate of the snow cover is made detachable, and an opening for drawing out the heater mounting plate to the outside when the side plate is removed is formed.

[Operation] As described above, when the hollow snow cover is attached so as to cover the ceiling of the container and the space heater is arranged in the space inside the snow cover, the snow falling on the snow cover is removed from the space heater. Because it can be melted by heat generation,
A large amount of snow can be prevented from accumulating on the upper part of the container, and a flashover accident due to snow can be prevented.

Further, since it is not necessary to form the upper surface of the snow cover to have a steep slope, it is necessary to increase the height of the bushing as in the case where a steep roof is installed or to increase the distance between the container and the bushing. And prevents the device from becoming bulky, such as when installing a steeply sloping roof.

Further, as described above, the space heater is attached to the heater mounting plate which is slidably supported, and a part of the side plate of the snow cover is detachable, and the detachable side plate is removed from the opening formed. If the heater can be pulled out together with the mounting plate, the heater can be easily replaced.

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

1 to 6 show the essential parts of an embodiment of the present invention, and the overall construction of this embodiment is similar to that shown in FIG. In the present invention, a snow cover 30 is attached to the ceiling part of the container 3 near the overhead wire drawing bushing 12 and in which a switchgear such as a circuit breaker is stored. As shown in FIG. 4, the snow cover 30 of this embodiment has a square or rectangular base plate 31 whose one side is larger than the outer diameter of the ceiling plate 3c of the container 3, and the base plate 31. And a cover main body 32 which is attached so as to cover.
The base plate 31 is fixed to the ceiling plate 3c of the container 3 with bolts 33. Standing wall portions 31a, 31a extending in the depth direction of the base plate 31 are formed at both ends in the width direction of the base plate 31.

As shown in FIG. 3, the cover main body 32 includes a gable-shaped roof plate 34 that covers the base plate 31 at intervals, and a side plate 35A that laterally closes the space between the roof plate 34 and the base plate 31. 35B, 36
And 37. The strip-shaped side plates 35A and 35B located at both ends of the roof plate 34 in the width direction are formed by vertically bending an extended portion continuous to both ends of the roof plate 34 in the width direction. Further, the home base type side plate 36 located at one end in the depth direction of the roof plate 34 includes the roof plate 34 and the side plates 35A and 35B.
Is welded to the edge of one end.

The inclination angle of the roof plate 34 with respect to the horizontal plane is set to a minimum size necessary for allowing the water generated by the melting of snow on the roof plate to flow down. The angle of inclination of this roof plate can be made much smaller than the angle of inclination required for the snow to fall naturally.

Inside the both ends of the roof plate 34 in the width direction, corner plates 38 and 39 are welded at positions near both ends in the longitudinal direction of the roof plate, respectively, and when the cover main body 32 is covered with the base plate 31. These corner plates come into contact with the standing wall portions 31a, 31a at both ends of the base plate 31 to position the cover body 32 in the vertical direction.

A home base type side plate 37 located on the other end side of the roof plate 34 in the depth direction is detachably attached. Therefore, the corner plates 38, 39 provided on the side plate 37 side are provided with screw holes 38a, 39a for screwing bolts for fixing the side plates. The side plate fixing plate 40 is welded to the inside of the top of the roof plate 34 of the cover body so as to be located near the end on the side plate 37 side which is removable, and this fixing plate 40 is also provided with a screw hole 40a.
The side plate 37 is fitted inside the ends of the roof plate 34 and the side plates 35A and 35B, and bolts 41 to 43 screwed into the screw holes 38a to 40a.
Are fixed to the roof plate 33 and the side plates 35A and 35B. Further, in this embodiment, in order to facilitate the attachment / detachment of the side plate 37, the positioning plates 45 to 47 are welded inside the side plate 37,
By fitting these positioning plates to the inner surface of the opening of the space 44 formed between the base plate 31 and the cover body 32, the side plate 37 can be temporarily held until the bolts 41 to 43 are attached. It is like this. A handle 48 is attached to the outer surface of the side plate 37.

As shown in FIG. 4, two sets of guide rails 50 are fixed to the upper surface of the base plate 31 and are composed of a pair of rail members extending in parallel along the depth direction of the roof plate 34.

As shown in FIGS. 4 and 5, a stud bolt 52 is provided which extends vertically through the one end of the rail member 50a located at the back of the cover. The stud bolt 52 has a collar 53 with a collar. They are fitted and fixed by nuts 54. A holding plate 55 having a tip portion 55a that obliquely rises is slidably held by the collar 53, and the holding plate 55 is provided between the collar portion 53a of the collar 53 and the holding plate 55. A spring 56 that biases the side is provided.

A heater mounting plate 57 formed in a channel shape is slidably supported on each of the guide rails 50 so as to lie down.
As shown in FIG. 6, a pair of U-shaped grooves 57a is formed at one end of each heater mounting plate 57, and an opening of a space 44 between the cover body 32 and the base plate 31 with the side plates 37 removed. From the side, the heater mounting plate 57 is slid along the guide rail 50 and the tip thereof is engaged between the pressing plate 55 and the guide rail 50, so that the U-shaped groove 57a is fitted to the bolt 52. The mounting plate 5
7 and position the end of the mounting plate 57
It is designed to be sandwiched and fixed between 5 and the guide rail. A handle 58 is attached to the other end of the heater attachment plate 57.

Three heater holding plates 59 (this number is arbitrary) are mounted on the heater mounting plate 57 via columns 58, and each heater holding plate is
Space heater 60 is held on 59. The power supply terminal of each space heater 60 is connected to the terminal of a terminal block 62 fixed to the end of the mounting plate 57 through a wire 61.

A pipe 63, which is erected from inside the operator box 17 along the side surface of the container 3 shown in FIG. 8, penetrates the base plate 31 and is introduced into a space 44 between the base plate and the cover body 32 (see FIG. (See FIG. 4), two sets of electric wires 64 are introduced into the space 44 through this pipe. The electric wires 64 are further guided through the pipe 65 fixed on the base plate 31 to the opening side of the space 44, and the ends of the electric wires 64 led out from the pipe 65 are provided on the heater mounting plates. It is connected to terminal 62.

As described above, when the snow cover 30 is attached to the upper surface of the container 3 and the space heater 60 is arranged therein, the cover is covered.
As the snow on the top of 30 can be melted, a large amount of snow can be prevented from forming on the upper part of the container, and a flashover between the snow and the terminals of the bushing can be prevented. .

Further, as in the above embodiment, a part of the side plate 37 of the snow cover 30 is
When the heater mounting plate 57 to which the space heater 60 is attached and detached is slid along the guide rail and the side plate 37 is removed, the heater mounting plate 57 can be pulled out to the outside through the opening formed. Can be easily replaced.

FIG. 7 shows another embodiment of the present invention. In this embodiment, a plug 66 is attached to the side surface of the heater mounting plate 57, and the power terminal of each space heater 60 is connected to the plug 66 through a predetermined wiring. It is connected. On the other hand, the base plate 31 is provided with a receptacle 67 to which a plug 66 is connected when the heater mounting plate 57 is slid along the guide rail 50 and the tip thereof is engaged between the holding plate 55 and the guide rail 50. Installed,
An electric wire 64 is connected to the receptacle 67. With this configuration, when the heater mounting plate 57 is slid along the guide rail 50 and positioned at a predetermined position, the power supply terminal of the space heater 60 is automatically connected to the electric wire 64, so the space heater is replaced. When doing so, it is not necessary to wire to the heater mounting plate.

In the above embodiment, it is preferable that the heater mounting plate 57 be pulled out from the bushing 12 for safety reasons.

Further, in order to prevent the cover body 32 from coming off due to strong wind or the like, it is preferable to provide a means for fixing the cover body 32 to the base plate 31. For fixing the cover body 31, for example, the side plates 35A and 35B of the cover body 32 are attached to the standing wall portion 31 of the base plate 31.
It can be done by bolting to a and 31a.

In the above-described embodiment, the roof plate 34 is formed in the gable shape, but the roof plate may be formed in the one-way type.

[Advantage of the Invention] As described above, according to the present invention, the hollow snow cover is attached so as to cover the ceiling of the container, and the space heater is arranged in the space inside the snow cover. It is possible to melt the snow that has fallen on the ground due to the heat generated by the space heater, and to prevent a large amount of snow from being deposited on the upper part of the container to prevent a flashover accident due to the snow.

In addition, since the top surface of the snow cover does not need to be formed with a steep slope, it is necessary to increase the height of the bushing and increase the distance between the container and the bushing as when installing a steep roof. It is possible to prevent the device from becoming large.

Further, according to the present invention, an opening formed by attaching a space heater to a heater mounting plate slidably supported, detaching a side plate of a part of the snow cover, and removing the detachable side plate. Since the heater together with the mounting plate can be pulled out, there is an advantage that the heater can be easily replaced.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is a front view of a main part with a removable side plate removed, and FIG. 2 is a view with the side plate attached. Front view, FIG. 3 is a perspective view showing the cover body of the snow cover, FIG. 4 is a plan view of the base mounting plate, FIG. 5 is a sectional view showing the vicinity of the end of the guide rail, and FIG. 6 is a heater mounting. Perspective view of plate, seventh
FIG. 8 is a plan view of a main part of another embodiment of the present invention, FIG. 8 is a configuration diagram showing an example of a gas insulated switchgear to which the present invention is directed, and FIG. 9 is a container of the gas insulated switchgear of FIG. Fig. 11 is a side view showing a state in which a roof for preventing snow accumulation is attached to Fig. 10, Fig. 10 is a front view showing a conventional example in which an insulation distance between the bushing and the roof is secured by raising the attachment position of the bushing, Fig. 11 [Fig. 6] is a front view showing a conventional example in which a bushing is arranged away from a snow cover roof. 1 ... Installation base, 3 ... Container, 4-6 ... Bushing mounting container, 12-14 ... Bushing, 18 ... Snow cover, 30 ... Snow cover,
31 ... Base plate, 32 ... Cover body, 34 ... Roof, 35A, 35B, 3
6,37 ... Side plate, 50 ... Guide rail, 57 ... Heater mounting plate, 60
… Space heater.

Claims (1)

[Scope of utility model registration request] 1. A gas-insulated switchgear in which an overhead wire drawing bushing is arranged near a container accommodating a switchgear and other switchgear, and a hollow snow protection device installed so as to cover the ceiling of the container. A cover and a space heater disposed in a space inside the snow cover, the snow cover includes a base plate fixed to a ceiling portion of the container and a roof plate covering the base plate with a space therebetween. A side plate that laterally closes a space between the roof plate and the base plate, wherein the space heater is slidably supported on a guide rail fixed to the base plate. A part of the side plate of the snow cover is detachably provided, and an opening is formed for pulling out the heater mounting plate to the outside when the side plate is removed. You Gas insulated switchgear.