JPH0736647B2 - How to make electrical equipment containers - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a method for manufacturing a container of a cubicle type insulated switchgear using an insulating medium such as SF6 gas.

"Prior Art" Fig. 7 shows an example of a cubicle type gas insulated switchgear (hereinafter referred to as "C-GIS") conventionally used in substations, etc., and Fig. 8 shows its single wire connection diagram. . As shown in FIG. 7, the C-GIS is a single device such as a circuit breaker 1, a disconnector 2, a grounding switch 3, a lightning arrester 4, a cable connecting portion 5 and a bus bar 6.
Etc. are collectively stored in a container 7, and the features of the device have been evaluated, and it has been widely used in recent years.

In the conventional C-GIS, from the manholes 8a and 8b provided in the container 7, the components such as the circuit breaker 1, the disconnecting switch 2 and the earthing switch 3 are carried into the container 7 individually or in a combined state. An operator enters the container 7 and each device is mounted on each wall surface of the container 7. That is, conventional C-GIS
Is manufactured by a procedure in which a substantially rectangular parallelepiped container is first manufactured, and then the device is carried in through a manhole provided in the container.

As the insulating medium 9 of this type of switchgear, insulation,
In addition to SF6 gas, which has excellent arc extinguishing properties, there are some that use insulating oil or the like, but the type of arc extinguishing medium 9 is not a requirement of the present invention, so it is not mentioned and is represented by the term C-GIS. Let me explain.

"Problems to be Solved by the Invention" The C-GIS having the conventional structure has the following drawbacks because a person must enter the container 7 to perform work.
That is, (1) in order to secure a working space, the arrangement of the devices must be provided with a margin, and the container must be enlarged, so that the intended compactness is sacrificed.

(2) In spite of (1), the worker is required to work in an unfavorable environment for the purpose of achieving compactness.

(3) As a result of (2), the reliability of the device is unavoidably deteriorated to some extent, and there is a risk of damage.

(4) Inefficiency.

(5) Since this type of switchgear has extremely strict electric field design conditions, it is extremely disliked by foreign substances, but there is always the risk of being brought in during work or adhering to and entering the worker himself. There is a concern that electrical reliability will deteriorate.

(6) Since the completion inspection cannot be performed until the work is completely completed, it takes a lot of labor and time to restore even if there is a defect.

Moreover, since each surface of the container 7 is formed of a flat plate having a rectangular shape as a base, it is difficult to provide a container that can withstand a large internal pressure, and in general, a pressure difference occurs inside and outside the container. It is applied only when the internal pressure is sufficiently low, but the joint between the bottom plate and the cover still has a weak point in strength, so a sturdy welded structure can be used. is necessary.

"Means for Solving Problems" After inserting necessary components into a flat bottom plate, a substantially rectangular parallelepiped cover having a projection surface slightly smaller than the bottom plate is joined to the bottom plate, and Near the joint,
According to a method of constructing a container of equipment by welding one end of a hook-shaped member having a frame-shaped projection surface and a hook-shaped member to a side plate of a cover and enclosing an insulating medium in the other end.

[Embodiment] FIG. 1 is a structural diagram showing an embodiment of a cubicle type opening / closing apparatus of the present invention. The single line connection diagram corresponding to FIG. 1 is the same as that of FIG. Further, a part of the description of the same structure part will be omitted. In FIG. 1, the constituent devices such as the circuit breaker 1, the disconnector 2, the grounding switch 3 and the like are the bottom plate 10 of the container 17.
After it is mounted on, the necessary measures such as checking the assembled state and reworking are taken. Thereafter, the bottom plate 10 and the cover 11, which is a substantially rectangular parallelepiped, are tentatively welded to an extent that they can be easily disassembled to form a housing. Perform necessary measures such as operation test in this state,
If there is a problem, remove the temporary welding and perform repair work. When the refurbishment work is completed, assembly and testing will be performed again. Reference numeral 4 is a lightning arrestor, which is mounted on the upper surface 12 of the cover 11, but an automatic connection structure such as a tulip contact is applied to the cable connecting portion 5, and the cover 11 is joined to the bottom plate 10. When the installation is completed. In the case of a device in which such automatic connection is taken into consideration, it is not always necessary to mount it on the bottom plate 10. The operation test may be carried out at the stage where each component is attached to the bottom plate 10 depending on the configuration of the device. After the test is completed, the hook members 13 are then placed along the bottom plate 10.
And one end of the side plate 14 of the cover 11 and the other end of the bottom plate 10
Respectively, and the insulating medium 9 is sealed in the container. Incidentally, in the case of a container 17 structure having a rectangular parallelepiped as a basic structure which is classified as a cubicle type opening / closing device, due to a pressure difference between the inside and outside of the container 17, it is more flexible than a spherical or cylindrical body, and the end of the container 17 is easily bent. High stress is generated in the part. Therefore, it is difficult to economically manufacture the container 17 because it is necessary to thicken the constituent members of the container 17 or to add a reinforcing member, but by welding the hook-shaped member 13, The part has a three-dimensional structure, and the rigidity and mechanical strength are significantly increased, and this is also an extremely advantageous structure. 2. FIG. 2 is a diagram showing details of the joint between the bottom plate 10, the side plate 14 of the cover 11 and the hook-shaped member 13.

FIG. 3 is a bottom plate corresponding to FIG. 2 of another embodiment of the present invention.
10 is a view showing a portion of the cover 11 and the hook-shaped member 13,
The bottom of 21 is formed outward in the direction of the side plate 14 so as to have a frame shape so that the cross section becomes L-shaped, and at the bottom of the side plate 24 of the cover 21 and the respective holes formed in the bottom plate 10 with bolts 15 or the like. This is a case where the same hook-shaped member 13 as in FIG. 2 is added near the bottom plate 10 and the cover 11 while being screwed to form a housing. Before the housing is completed by the hook-shaped member 13, the cover 21 can be easily attached and detached as compared with the case of FIG. 4 is similar to the case of FIG. 3, but a gasket 16 is provided between the bottom of the cover 11 and the bottom plate 10.
Is the case of adding. In this case, cover 11 and bottom plate 10
There is a feature that the insulating medium 9 can be sealed at the stage of screwing. Since the insulating medium 9 needs only to be sealed for a short period between tests, it can be used even when the cover 11 and the bottom plate 10 are screwed together. Further, when the gasket 16 is used, there is also a feature that it is good in terms of quality maintenance when it is left in a temporarily assembled state for a long time. Furthermore, FIG. 5 is the same as the case of FIG.
This is the case where the method of sandwiching 11 and the bottom plate 10 with a tool such as a vise 27 is used instead of screwing.

Further, FIG. 6 shows that the hook-shaped member 23 is composed of two flat plates, one of which is previously fixed to the side plate 24 by a method such as welding, and the bottom plate 10 and the cover 21 are joined to form a housing. After being constructed, the other one end of the hook-shaped member 13 is welded to the bottom plate 10 and the other end is welded to the other one of the hook-shaped members 23 which are previously fixed to the cover. In the case of the configuration shown in FIG. 6, since the welded portion after the housing is constructed is located away from the side plate 24, the surface treatment such as painting applied to the inner surface of the side plate 24 in advance does not affect the heat of welding. It is characterized by being able to eliminate the effects. The structure of FIG. 6 can be applied to any of FIGS. 2 to 5.

[Advantages of the Invention] (1) Assembling and inspecting the equipment can be done in an open state on the bottom plate, so the arrangement of the equipment can be determined based on performance requirements, and the construction can be extremely compact.

(2) It is possible to work in a good environment, and no extra burden is imposed on the worker.

(3) The risk of damaging the device is almost eliminated, and the reliability is improved.

(4) High work efficiency.

(5) Removal of foreign matter such as dust is extremely easy and highly reliable.

(6) Repair work should be easy.

(7) The rigidity of the joint between the bottom plate and the cover, which is a weak point in strength, is remarkably high, and the strength is also improved.

[Brief description of drawings]

FIG. 1 is a structural view showing an embodiment of the present invention, FIG. 2 is a detailed view of a joint between a bottom plate and a cover, FIGS. 3 to 6 are detailed views of a joint with respect to other embodiments, and FIG. Shows a structure diagram of a conventional example, and FIG. 8 shows a single line connection diagram. In the figure, 10 is a bottom plate 11, a cover 13 is a hook member 14, a side plate 17 is a container.

Claims (1)

[Claims] 1. A plurality of electric devices are assembled on a flat bottom plate, a substantially rectangular parallelepiped cover that covers the electric devices and has a projection surface slightly smaller than the bottom plate is formed, and a tip portion is provided on a side plate of the cover. Welds the flat plate so as to project outward of the side plate, temporarily joins the lower end of the cover to the bottom plate, and outside the joint between the cover and the bottom plate, the bottom plate has a tip end on top. The flat plates are welded so as to project in the direction, the tip portions of the two flat plates are welded to each other to form a hook-shaped member, and an insulating medium is enclosed in a container formed by the cover and the bottom plate. A method for manufacturing an electric equipment container, comprising: