KR102488644B1 - Underground-laid electric transformer, switch and foundation structure thereof - Google Patents

Abstract

An underground buried power device is provided. A structure for an underground power device according to some embodiments of the present invention includes a power device installation box in which the power device is installed, a cable entry box located on one side of the power device installation box and having a first cable drawn from the outside, and the and a cable lead-out box located on the other side of the power device installation box and from which a second cable is drawn out, and an inner space of the power device installation box is a space distinguished from the cable lead-in box or the cable lead-out box, and the first cable is introduced into the power device through the cable lead-in box, and the second cable is pulled out of the power device through the cable lead-out box.

Description

Underground buried transformer, switchgear and its installation foundation structure {UNDERGROUND-LAID ELECTRIC TRANSFORMER, SWITCH AND FOUNDATION STRUCTURE THEREOF}

The present invention relates to a transformer, a switchgear, and a basic structure for installing the same, which can safely take waterproof measures while simplifying installation, operation, and maintenance when installing high-voltage facilities such as transformers and switches in the ground.

When a distribution line is buried underground, the distribution line is mainly constructed along the roadside. When installing a transformer or switch, a concrete foundation is first installed underground, then cables are drawn in and out, and the transformer or switch is installed on the foundation again. will do However, when a transformer or switchgear is installed underground, it is difficult to completely waterproof the inlet and outlet of the cable, and when connecting the cable from the front, the base becomes large and there are problems with maintenance. In the past, transformers or switchgear were generally installed on the ground. have been

On the other hand, if a transformer or switchgear is installed on the ground, a considerably large volume of electrical equipment must be installed on the road, which hinders walking and impairs the aesthetics of the city. cause this to be raised. In order to solve these conflicting problems, a relatively wide manhole is installed underground, and a method of installing, constructing, and maintaining a transformer or switch in the manhole has been proposed. However, in order to apply this method, waterproofing is difficult and drainage facilities are required for cable inlet and outlet, foundation cover, as well as electrical facilities buried in the ground. However, there is a problem in that it is difficult to secure a wide foundation space because water or gas pipes are installed underground in the actual roadside.

Republic of Korea Patent Registration No. 10-1848836 (published on July 24, 2017)

The technical problem to be solved by the present invention is to solve the problem of work space and waterproofing caused by connecting underground cables, and to solve the installation, operation, maintenance, and replacement of transformers and switchgear smoothly, thereby improving urban aesthetics, securing pedestrian paths, It is to remove the elements of various civil complaints. Therefore, the present invention includes information on a new structure of a transformer and a switchgear and a concrete foundation structure for accommodating and installing them in the ground and connecting high-voltage cables.

According to some embodiments of the present invention for achieving the above object, a structure for a power device buried in the ground is located on one side of a power device installation box in which electrical equipment is installed, and a first cable from the outside. and a cable lead-out box located on the other side of the power device installation box and from which a second cable is pulled out, and the inner space of the power device installation box is the same as the cable lead-in box or the cable lead-out box. It is a divided space, the first cable is introduced into the electrical equipment through the cable entry box, and the second cable is pulled out of the electrical equipment through the cable withdrawal box.

As an embodiment, the cable entry box includes an inlet located at a lower portion of the cable entry box and through which the first cable is introduced from the outside, and an inlet located at an upper portion of the cable entry box and introduced through the inlet to the power device. It may include a passage groove that is introduced into the installation.

As an embodiment, the cable withdrawal box is located at the top of the cable withdrawal box and has a passage groove through which the second cable is withdrawn from the power device installation box, and the second cable is located at the bottom of the cable withdrawal box and drawn out through the passage groove. 2 May include an outlet through which the cable is led out.

As one embodiment, the passage groove may be formed in a 'U' shape.

As an embodiment, it may further include a waterproof block mounted in the passage groove to prevent inflow of water by installing the power device.

As an embodiment, an upper cover covering an upper portion of the power device installation box, and a sealing portion mounted between the power device installation box and the upper cover may be further included.

As an embodiment, a pipe for inducing a flow of air may be formed on the upper cover so that the air inside the power device installation box can be circulated to the outside.

As an embodiment, a foreign substance inflow prevention body may be provided at one end of the pipe to prevent the inflow of external rainwater.

A transformer installed in an underground buried structure according to some embodiments of the present invention for achieving the above object is a transformer core including a transformer core, located on the side of the transformer unit and forming an enclosed space separated from the transformer unit. An independent space and a transformer protection device installed in the independent space and electrically connected to the transformer to protect the transformer.

As an embodiment, the transformer protection device includes a current-limiting fuse and a bay-O-net fuse, and the current-limiting fuse and the bayonet fuse may be connected in series with each other.

As an embodiment, an upper hole of the fuse box located above the independent space may be further included, and the current-limiting fuse or the bayonet fuse may be replaceable through the upper hole of the fuse box.

As an embodiment, further comprising a first bushing into which the first cable is introduced from the outside, and a second bushing through which the second cable is drawn out to the outside, wherein the first bushing and the second bushing are electrically connected to each other through a conductor. The conductor is electrically connected to one end of the current-limiting fuse, and the other end of the current-limiting fuse is formed as an insulating bushing and can be introduced into the transformer.

As an embodiment, the transformer and the independent space are installed in a power device installation box of the underground buried structure, and the underground buried structure is located on one side of the power device installation box and a first cable is introduced from the outside It may include a cable entry box, and a cable withdrawal box located on the other side of the power device installation box and from which a second cable is pulled out.

An opening and closing device installed in an underground buried structure according to some embodiments of the present disclosure for achieving the above object includes a plurality of two-way switching device bushings located on both sides facing each other, and the plurality of two-way opening and closing device bushings. -Including switchgear actuators positioned between way switchgear bushings, wherein the plurality of two-way switchgear bushings and the switchgear actuators are installed in a power appliance installation box of the buried structure is located on one side of the power device installation box and includes a cable lead-in box through which a first cable is introduced from the outside, and a cable lead-out box located on the other side of the power device installation box and through which a second cable is pulled out to the outside.

Undergrounding of distribution lines is essential for securing urban aesthetics and safety, and it is a keen interest in urban undergrounding work worldwide. When installed on the ground, it occupies the road, obstructs the view, harms the commercial district, and causes traffic accidents. The main reason why power equipment cannot be buried in the ground is due to waterproof problems of power equipment when flooded and inconvenience in installation, operation, and maintenance. The present invention provides a means to solve this problem, Suggests solutions to pressure rise and heat dissipation problems during arcing. According to the present invention, installation, operation, maintenance, etc. are similar to the existing ground installation type, but it is possible to make an ideal urban distribution line underground by not occupying a road on the ground.

1 is an exemplary installation view of a conventional ground-type transformer.
2 is an installation example of a conventional ground type switchgear.
3 is an exemplary view of a conventional underground installation type switchgear.
4 is an exemplary installation view of the underground installation type transformer of the present invention.
5 is an exemplary installation view of the underground installation type switchgear of the present invention.
6 is a structural example of an underground installation type transformer of the present invention.
7 is a structural example of an underground installation type switchgear of the present invention.
8 is an exemplary view of a cable installation box and a power device installation box of the present invention.
9 is an upper view of the installation of the underground installation type transformer of the present invention.
10 is a front view of installing an underground installation type transformer of the present invention.
11 is a front view of the installation of the underground installation type transformer of the present invention.
12 is an upper view of the installation of the underground installation type switchgear of the present invention.
13 is a front view of the installation of an underground installation type switchgear of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the technical idea of the present invention is not limited to the following embodiments and can be implemented in various different forms, only the following embodiments complete the technical idea of the present invention, and in the technical field to which the present invention belongs It is provided to fully inform those skilled in the art of the scope of the present invention, and the technical spirit of the present invention is only defined by the scope of the claims.

In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined. Terminology used herein is for describing the embodiments and is not intended to limit the present invention. In this specification, singular forms also include plural forms unless specifically stated otherwise in a phrase.

In addition, in describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is directly connected or connectable to the other element, but there is another element between the elements. It will be understood that elements may be “connected”, “coupled” or “connected”.

As used herein, "comprises" and/or "comprising" means that a stated component, step, operation, and/or element is one or more other components, steps, operations, and/or elements. Existence or additions are not excluded.

Hereinafter, various embodiments of the present invention for solving the above-described technical problem will be described.

In general, cables buried underground are usually buried at a depth of about 1 m underground and extended along the roadside. When the cable is branched, a switchgear is installed on the ground, and a transformer is installed to supply power when low voltage power is required. In the case of a building with a large demand for electricity, it is sufficient to install only a multi-circuit switchgear because a power reception facility is installed inside the building. I have no choice but to In this case, the problem of narrowing the pedestrian path of the road mentioned above and damaging the urban aesthetics occurs, and if the demand for power increases even after installation, additional transformers must be continuously added, so the urban aesthetics, the right of passage of citizens, and the safety of passers-by Serious problems can arise. At this time, when electrical equipment is buried underground, urban aesthetics, right of way, and safety issues are relatively small, but in the case of conventional underground electrical equipment, there were various deficiencies in waterproofing and dustproofing, and also, Due to limited space, installation and maintenance of electrical equipment were difficult.

The present invention proposes a buried electric facility and a structure for it that can comprehensively solve the various problems described above. In the present invention, the structure in which the underground electrical equipment is installed is spatially separated into a part where the electric equipment is installed, a part where the cable is introduced, and a part where the cable is pulled out, respectively, and the cable passes between the separated spaces. After forming a passage groove on the upper part of the structure, sealing the peripheral gap to prevent water or dust from entering the electrical equipment, while fitting it to the structure so that the installation, operation and maintenance of the electrical equipment can be performed on the upper ground Optimize the shape of electrical installations.

Underground cable lines are installed with high-voltage cables buried in the ground, and a concrete foundation is installed at the point where a transformer or switch is installed to form a manhole. Cables are drawn in and out of manholes, and cable connections with transformers or switchgear are made on the front of the ground, so they occupy pedestrian paths, damage urban aesthetics, and cause various civil complaints.

The reason why it was difficult to bury the power equipment above in the ground is that it is difficult to waterproof the cable inlet and outlet, so there is a high risk of insulation accidents due to flooding when installing transformers and switches in the ground, and both the cable connection area and the control box This is because it is located in the front and requires a large work space in the basement. The existing installation foundation structure is a square column with a blocked bottom, and a weak part that can be drilled according to the situation of the site is made at the bottom so that the cable can be pulled in and out, and after the cable work is completed, waterproofing measures are taken again, but to prevent water inflow Since it cannot be completely blocked, it relies on natural drainage, so transformers and switchgear must be installed on the ground to prevent flooding. Therefore, the cable connection part and operation part of the existing switchgear and transformer are located on the front side, and the installation height on the ground is increased, causing the above-described problem. In order to solve this problem, in the present invention, the cable entry and exit installation box installed underground and the power equipment installation box for installing and accommodating transformers, switches, etc. By pulling in and out, there is a cable installation box outside the power equipment installation box, and the power equipment installation box is connected to the cable installation box through the upper U-shaped groove, but the lower part has a completely waterproof and separate structure. The cable installation box can be located on the left and right sides, front and rear, or front and rear left and right sides of the power equipment installation box. connected to the installation box. Waterproofing is limited between the U-shaped groove and the cable, base and upper cover, and installation of power equipment, connection of cables, operation and maintenance work are all performed from the top with the top cover removed.

In the case of the existing ground-mounted foundation, the upper part of the foundation is buried 10 to 15 cm higher than the ground to prevent rainwater inflow at normal times. Therefore, the existing foundation does not completely waterproof the cable inlet and outlet, and the electric power machine, cable connection part, control part, and control device are installed on the ground, solving the insulation problem in case of flooding.

In the present invention, the upper part of the cable installation box and the power equipment installation box can be installed 10 to 15 cm above the ground to prevent the inflow of rainwater, and the upper part is waterproofed between the cover and the installation box through rubber packing, etc., and the cable installation box and power The U-shaped groove between the equipment installation boxes facilitates cable installation and removal, while achieving perfect waterproofing through the U-shaped separated upper and lower rubber packing. Existing installation foundations are submerged in water when the road is submerged above a certain height, but in the present invention, as long as the U-shaped groove between the top of the installation box and the cover maintains a seal, it maintains waterproof regardless of the submerged height. In general, since power cables are installed along roads, the cable lead-in and lead-out directions are often in the roadside direction, and sometimes may cross roads. If the cable installation is placed on the left and right along the roadside, the width of the left and right sides increases, but the length occupying the width of the road decreases, so that the distance to water, gas, communication lines, etc. of the road can be secured. The cable installation box can be located on the left and right sides, the front, etc. of the power equipment installation box. To put it simply, the outer cable installation box and the central power equipment installation box have a double wall while sharing the bottom surface, and the cable installation box It is pierced to the outside through another tool and is connected to the power equipment installation box only through the U-shaped groove on the top. The cable installation box must have a space larger than the bending radius of the cable work. The order of construction is almost the same as in the case of existing ground installation. First, the cable is laid and the installation box is buried, and then the cable is pulled out to the ground through the inlet and outlet. After that, the power equipment is placed in the installation box, the cable connection work is completed, and the cover is covered. For underground burial, structures such as transformers and switchgear should be suitable for underground burial in addition to doubled cables and power equipment installation boxes.

In the case of a transformer, there is a transformer protection device on either side of the transformer, which is connected to the primary coil of the transformer, and also has a bushing part that can connect the cable to another transformer, and the output of the secondary coil is also waterproofed to the outside through the protection device. should be sent out. It is advantageous for safety to install the transformer protection device outside the transformer box, but it is also possible to install it in one box.

In the present invention, the cable installation box is placed outside the power equipment installation box, and there is a perforated portion for cable insertion and withdrawal at the bottom of the cable installation box, and the cables coming out of the cable installation box are connected to the power equipment installation box through the U-shaped groove at the top. do. At this time, water can enter the cable installation box, but it drains naturally, and the power equipment installation box is waterproofed through the waterproof sealing of the U-shaped groove, and the upper cover is sealed by rubber packing at the top of the cable installation box and power equipment installation box. Transformers, switchgear, etc. are configured such that bushings are placed at the top so that cables can be connected from the top, and operating mechanisms are operated at the top.

1 is an example of the installation of a conventional land-type transformer, and there is a perforated part for cable inlet and outlet at the bottom of one concrete foundation, and a base on which the transformer can be placed and fixed. The bushing is arranged in the front part of the ground, and the primary protection device for the transformer (Magnex switch) is also arranged in the front part. The concrete foundation is a submerged but naturally draining structure. This method is easy to install transformers and connect cables, and it is convenient to operate the Magnex switch, but it takes up a lot of space on the ground, which spoils the aesthetics of the city, causes civil complaints, and causes inconvenience to traffic.

FIG. 2 is an exemplary installation view of a conventional ground type switchgear, which is similar in appearance and function to FIG. 1. Referring to FIG.

3 is an example of installation of a conventional snow-type switchgear, which requires a wide working space for cables and limits its application, and requires a drainage pump to be installed in preparation for flooding, which is expensive and generally difficult to apply.

4 is an exemplary diagram of an underground installation type transformer of the present invention. There is a cable installation box on the outer left and right sides of the transformer installation box, and there is a perforated area for cable entry and exit at the bottom of the cable installation box. The cable installation box and transformer installation box are connected with cables by the U-shaped groove on the top, and the manhole cover is located on the top of the cable installation box and transformer installation box, which is waterproofed through rubber packing. In the case of a transformer, heat dissipation measures are required, which can circulate outside air through a fan by installing intake and exhaust pipes at the top of the transformer installation box, and transfer heat from the transformer to the cable installation box through heat pipes, etc., and from the cable installation box to the outside atmosphere. heat exchange can occur. The cable coming into the transformer is connected to a bushing connected to a current-limiting fuse, Magnex, etc., and this bushing is connected to another bushing to connect another transformer. The high-voltage lead wire via the current-limiting fuse Magnex is connected to the primary coil inside the transformer to protect the transformer. Since the transformer does not normally operate, only fuse replacement and heat dissipation problems need to be solved, and there is no need to be restricted by insulation methods such as oil-immersed, dry, or molded transformers. However, since the inside of the power equipment installation box may become damp, a pipe for air convection on the upper part of the cover can be installed.

5 is an illustration of the underground installation type switchgear of the present invention, and the cable installation box needs to be located on the left and right sides or the front side, and the cable connection bushing, the operating tool of the operating mechanism, and the control device are installed on the ground so as to be located on the upper part , operation and maintenance. In the case of an underground installation type switchgear, it is necessary to install a safety barrier to reduce the pressure during an internal arc, and it is necessary to install a safety barrier between the power equipment installation box and the cable installation box or on the top of the power equipment installation box and install the cable to prevent excessive pressure during an internal arc. It is necessary to discharge through the cable duct through the box and, if necessary, through a safe gas discharge path from the top of the cable installation box.

Figure 6 is a structural example of the underground installation type transformer of the present invention, the transformer protection device can be distinguished from the transformer body and may be installed inside the transformer body. In order to smoothly operate the protection device in case of internal failure of the transformer, it is advantageous to manufacture it in a separate structure. The cable from the cable installation box is combined with the bushing connected to the protection device, and one of the conductors connected to the bushing is connected to the primary coil of the transformer through a fuse or protection device and connected to the cable lead-out bushing to configure the network.

7 is a schematic diagram of the structure of an underground installation type switchgear of the present invention, and installation, operation, maintenance, etc. can be easily performed on the ground only when the bushing, operating mechanism, operation tool, and control device are all positioned at the top. The bushing of the switchgear can be arranged so that two sets of cables can be combined from the left and right, or all four sets can be combined from the front. A safety shield is installed in the switchgear tank to discharge it when the pressure rises due to an internal arc, and another safety shield is installed in the installation of power equipment to discharge excessive pressure by installing a cable. If the switch is insulated with epoxy instead of SF6 gas or air insulation, it is more convenient because there is no need for a separate safety barrier because there is not much pressure rise.

8 is an exemplary view of a cable installation box and a power equipment installation box of the present invention, in which a cable entry and exit installation box installed underground and a power equipment installation box for installing and accommodating transformers, switchgear, etc. are separated through a partition wall and power equipment is installed There is a cable installation box outside the power equipment installation box by introducing and withdrawing the cable through the U-shaped groove on the top, and the power equipment installation box is connected to the cable installation box through the U-shaped groove on the top, but the lower part is a completely waterproof and detachable structure. . The cable installation box can be located on the left and right sides, front and back, or front and rear left and right sides of the power equipment installation box. connected with Ham Waterproofing is limited between the U-shaped groove and the cable, base and upper cover, and installation of power equipment, connection of cables, operation and maintenance work are all performed from the top with the top cover removed.

Unlike a transformer, a switchgear requires a mechanical operating mechanism and an electrical control device in addition to a cable connection bushing, and all of these must be located at the top. There can be a method of arranging the cable connection bushing on the left and right of the upper part, or a method of arranging it on the front part. In the case of arranging the cable connection bushing on the front part, it is substantially the same as the existing switchgear configuration, but the road occupation width is increased, and the left and right arrangement structure is the road occupation width is small, but the internal structure of the switchgear is designed to fit it.

In the case of a transformer, in order to solve the heat dissipation problem, the heat of the transformer is transferred to the cable installation box through a heat pipe or a heat medium circulation pipe, and is designed in a structure where it is discharged to the outside.

Referring to FIG. 8 , a structure 100 for a buried electrical installation in the ground includes a foundation 110, one or more waterproof blocks 120, a sealing part 130, and an upper cover 140.

The foundation 110 is a structure that houses electrical equipment such as transformers and switchgear and allows cables buried in the ground to be drawn in and out.

Among the boxes 111, 112, and 113, the box located in the center is an electrical equipment installation box 111 in which underground buried electrical equipment is installed and stored, and the installed and stored electrical equipment is protected from external air and dust. do. On both sides of the electrical equipment installation box 111, a cable entry box 112 into which cables are introduced and a cable withdrawal box 113 through which cables are pulled out are provided.

The cable entry box 112 is a structure for physically separating the cable entry part from the electrical equipment and is provided on one side of the power device installation box 111. The cable entry box 112 is provided with an inlet 114a through which the cable is introduced at the bottom and a passage groove 114b through which the cable enters the power device installation box 111 is provided at the top.

A plurality of inlets 114a may be formed in various directions in the cable inlet 112 . For example, since water or dust in the cable entry box 112 should not flow into the power equipment installation box 111, the inlet cannot be formed in the direction of contact with the power equipment installation box 111, but the other three directions Each inlet 114a may be formed as. The inlet 114a may be formed by directly drilling a hole in the field according to the underground cable laying depth of the site after the foundation 110 is buried. In general, since the underground cable is buried at a depth of about 1 m underground, the outlet 114a is also formed at the lower part of the cable entry box 112 accordingly.

The passage groove 114b is a passage through which the cable introduced into the cable entry box 112 is connected to the electrical equipment installed in the power device installation box 111. The passage groove 114b is the upper part (preferably, the uppermost part) of the cable entry box 112 so that water inside the cable entry box 112 does not flow into the power device installation box 111 through the passage groove 114b. is formed in The passage groove 114b is as shown in FIG. 1 so that the waterproof block 120 can be easily attached to and detached from the passage groove 114b and there is no gap between the waterproof block 120 and the passage groove 114b. It may be formed in a 'U' shape.

The cable withdrawal box 113 is a structure for physically separating a portion from which cables are drawn out from electrical equipment, and is provided on one side of the power device installation box 111. The cable withdrawal box 113 may be provided on one side opposite to the cable entry box 112, but the present embodiment is not limited thereto. The cable withdrawal box 113 is provided with a passage groove through which cables pass through from the power device installation box 111 at the upper part, and a withdrawal hole through which the cable that has passed through is drawn out to the outside at the lower part.

In contrast to the cable entry box 112, except for the fact that the cable is pulled out from the power equipment installation box 111, the overall mechanical structure of the cable entry box 113 is the same as that of the cable entry box 112. Accordingly, further description of the cable drawer 113 and the outlet and passage groove provided therein will be omitted for redundancy of description.

The waterproof block 120 is mounted in the passage groove 114b of the cable entry box 112 or the passage groove of the cable withdrawal box 113, and is a seal that prevents water or dust from entering the power device installation box 111. provide means The individual waterproof block 120 is composed of one set of an upper piece (a) and a lower piece (b), and after inserting the lower piece (b) into the passage groove, the cable is drawn in or pulled out over it, and the drawn in or drawn out It is mounted in such a way that the upper piece (a) is inserted into the passage groove again over the cable. The waterproof block 120 is provided as many as the number of passage grooves provided in the foundation 110, and is mounted one-to-one in the passage grooves. As an embodiment, the waterproof block 120 may be made of an elastic and stretchable material such as rubber.

The sealing unit 130 is mounted between the base 110 and the upper cover 140, and performs a sealing function to prevent water or dust from passing through the gap between the base 110 and the upper cover 140. . The sealing unit 130 is placed on the foundation 110 after the waterproof block 120 is mounted on the foundation 110, and then mounted in such a way that the upper cover 140 is covered on the sealing unit 130 again. As an example, the sealing unit 130 may be made of a material having elasticity and elasticity such as rubber.

The upper cover 140 is a cover for isolating and sealing the inside of the base 110 from the outside, and is covered on the base 110. The upper cover 140 may be made of a metal material resistant to external impact, and the upper cover 140 has a pipe 141 for inducing air flow so that the air inside the foundation 110 can be circulated to the outside. One or more may be provided. As an example, after the upper cover 140 is mounted on the sealing portion 130, the same additional waterproof treatment may be applied by applying a waterproof coating thereon.

According to the configuration as described above, a structure 100 for an underground buried electrical installation is provided. The important point here is that there is no cable inlet at the bottom of the power device installation box (111) where electrical facilities such as transformers are placed, so the cable passage groove and the top of the power device installation box (111) are connected to the waterproof block 120 and the sealing part 130, respectively. If sealed, it is possible to prevent external water or dust from entering the inside of the power device installation box 111. Even if water and dust from the outside come in through the cable inlet 114a and the outlet, it stays only in the cable inlet 112 and the cable outlet 113 and does not flow into the power equipment installation box 111. don't

In the previous method, the inlet and outlet had to be formed directly at the part where the electrical equipment was installed according to the location of the underground cable buried at a depth of 1m underground. Accordingly, situations in which the buried type method is abandoned are common, but according to the present invention, such problems can be solved at once.

Meanwhile, in FIG. 8 , the power device installation box 111, the cable entry box 112, and the cable withdrawal box 113 are shown as integral, but the scope of the present invention is not limited thereto. For example, it is also possible to configure the base 110 by manufacturing the power equipment installation box 111, the cable entry box 112, and the cable withdrawal box 113 in separate forms and then combining them. Do.

9 is an upper view of the installation of the underground installation type transformer of the present invention. Referring to FIG. 9 , a form in which a transformer is installed in the structure of the foundation 110 described in FIG. 8 is shown.

In this embodiment, the main devices of the transformer 115 are disposed on the upper surface to enable integral installation, operation, and maintenance on the top or on the ground in accordance with the structure of the structure 100 proposed in FIG. 8 . Referring to FIG. 9 , for example, the network switch operating unit 116 of the transformer 115, the network switch operating unit 117, a pair of high-voltage bushings 118a and 118b, and the upper hole 119 of the fuse box are connected to the transformer. (115) may be disposed on the upper surface.

The pair of high-voltage bushings 118a and 118b are connected with cables drawn in or out through the passage grooves 114b. For example, the cable introduced into the cable entry box 112 is introduced into the first high-voltage bushing 118a through the passage groove 114b, and the cable drawn out from the second high-voltage bushing 118b passes through the passage groove 114b. It passes through the cable withdrawal box 113 and is drawn out.

Since the configuration and functions of the other network switch control unit 116, the network switch control unit 117, and the upper hole 119 of the fuse box are well known in the art, further description thereof will be omitted here.

According to the structure of the transformer 115 as described above, since all operations necessary for installing a transformer, introducing a cable into a transformer, or withdrawing a cable from a transformer can be completed from the top, the operator can directly perform the base (110 ) and do not have to work. Therefore, since it is not necessary to secure a separate work space inside the foundation 110, the size of the structure 100 can be minimized.

10 is a front view of installing an underground installation type transformer of the present invention. Referring to FIG. 10 , the internal structure of the transformer 115 is additionally shown.

In FIG. 10, the transformer 115 includes a transformer core including a transformer primary and secondary windings 155 coupled to the same transformer iron core 154, and a transformer to protect the transformer 150. As a transformer protection device for protection, an overcurrent protection device 153 for overcurrent protection and a current limiting fuse 152 as a back-up protection device are included. Transformer insulating oil 156 is filled in the transformer unit 150 to insulate the transformer unit 150 from the outside. As an example, the overcurrent protection device 153 may be a Bay-O-net fuse or a load switching device.

In the case of a normal oil-immersed transformer, a current-limiting fuse and an overcurrent protection device are installed within the space of the transformer 150. In this case, if a flashover occurs in the fuse power supply unit when the transformer 115 is short-circuited, the function of the fuse may be lost. Accordingly, in the transformer 115 according to the present embodiment, the current limiting fuse 162 and the overcurrent protection device 163 are installed in an independent space 160, which is a separate enclosed space located on the side of the transformer 150, so that the transformer ( 115) It prevents the fuse from losing its function even in the event of an internal short circuit, and makes maintenance work such as replacement of the fuse easier. At this time, the current limiting fuse 162 and the overcurrent protection device 163 may be connected in series with each other.

As an embodiment, the current-limiting fuse 162 may be installed in a separate fuse box 161. At this time, the first high-voltage bushing 118a into which the cable is introduced and the second high-voltage bushing 118b into which the cable is pulled out may be positioned above the fuse box 161, and the fuse box upper hole 119 (not shown in FIG. 10) ) to replace the fuse. At this time, the first high-voltage bushing 118a and the second high-voltage bushing 118b are electrically connected through a conductor, and the conductor is electrically connected to one end of the current-limiting fuse 162, and the current-limiting fuse 162 The other end may be formed of an insulating bushing and introduced into the transformer 150 to be connected to the primary coil.

On the other hand, as described above, the upper cover 140 may be provided with one or more pipes 141 for inducing air flow so that the air inside the foundation 110 can be circulated to the outside, and the pipe 141 ) is provided with a hat-shaped foreign matter inflow prevention body at the ground-side end of ) to prevent external rainwater from flowing into the foundation 110.

11 is a front view of the installation of the underground installation type transformer of the present invention. The embodiment of FIG. 11 has most of the same configuration as the embodiment of FIG. 10, except that a network switch 164 is installed in a separate independent space 160 located on the side of the transformer 150, and a current-limiting fuse 162 ) and the fuse box 161 are moved to the lower side of the network switch 164, and the overcurrent protection device 163 (not shown in FIG. 11) is installed inside the transformer 150.

The present invention may be modified in various ways other than the form shown in FIGS. 10 and 11, but the high-voltage bushings 118a and 118b through which cables are drawn in and out are disposed above the transformer 115, and the fuse 162 or overcurrent By installing a transformer protection device such as the protection device 163 in an independent space 160 separated from the transformer 150, it is characterized in that the fuse fulfills its function even in the event of a flashover inside the transformer 115.

12 is an upper view of the installation of the underground installation type switchgear of the present invention.

Referring to FIG. 12 , a form in which an opening/closing device 215 is installed in a foundation 210 structure is shown.

The overall structure and shape of the base 210 is the same as that of the base 110 described in FIGS. 8 and 9 . That is, in the base 210, the power device installation box 211 is located in the center, and the cable entry box 212 and the cable withdrawal box 213 are located on the left and right sides of the power device installation box 211, A passage groove 214 is provided between the entry box 212 and the cable withdrawal box 213 and the power device installation box 211 so that cables can be drawn in or out.

12, the switchgear 215 is installed inside the power device installation box 211, and two-way switchgear bushings 216 are located on both sides of the switchgear 215, respectively. An open/close device manipulator 217 is positioned between both of the open/close device bushings 216 to facilitate operation and maintenance of the open/close device.

As in the previous embodiments of FIGS. 8 to 11, in the embodiment of FIG. 12, since the switchgear 215, which is a major electrical facility, is located in the power device installation box 211, it is the same as that described in FIGS. 8 to 11. For structural reasons, external water or dust does not flow into the opening/closing device 215. Accordingly, damage to the switchgear 215 due to moisture or dust is significantly reduced, maintenance of the switchgear 215 is facilitated, and furthermore, the main components of the switchgear 215 are located above the switchgear 215. Therefore, installation, operation and maintenance can be performed directly from the top or on the ground, eliminating the need to provide a separate work space inside the foundation 210.

13 is a front view of the installation of an underground installation type switchgear of the present invention. As in the previous embodiment of FIGS. 10 and 11 , in the embodiment of FIG. 13 , a form in which the sealing part 230 and the upper cover 240 are mounted on the foundation 210 is shown. The upper cover 240 may be provided with one or more pipes 241 for inducing air flow so that the air inside the foundation 210 can be circulated to the outside, and the upper end of the pipe 241 is shaped like a lampshade. A foreign material inflow prevention body is provided to prevent external rainwater from flowing into the base 210.

Other descriptions of the base 210, the sealing portion 230, and the upper cover 240 are of the base 110, the sealing portion 130, and the upper cover 140 described above with reference to FIGS. 8 to 11. Since the content is the same, additional description is omitted here to avoid duplication of description.

In the above, even though all the components constituting the embodiment of the present invention have been described as being combined or operated as one, the technical spirit of the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate.

Although actions are shown in a particular order in the drawings, it should not be understood that the actions must be performed in the specific order shown or in a sequential order, or that all shown actions must be performed to obtain a desired result. In certain circumstances, multitasking and parallel processing may be advantageous. Moreover, the separation of the various components in the embodiments described above should not be understood as requiring such separation, and the described program components and systems may generally be integrated together into a single software product or packaged into multiple software products. It should be understood that there is

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art can implement the present invention in other specific forms without changing the technical spirit or essential features. can understand that there is Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the technical ideas defined by the present invention.

Claims (14)

Install power equipment where electrical equipment is installed;
an upper cover mounted between the power device installation boxes and covering an upper portion of the power device installation boxes including a sealing portion for preventing foreign substances from entering from the outside;
a cable entry box located on one side of the power device installation box and into which a first cable is introduced from the outside; and
Including a cable withdrawal box located on the other side of the power device installation box and from which a second cable is pulled out,
The inner space of the power device installation box is a space distinguished from the cable entry box or the cable withdrawal box,
The first cable is introduced into the electrical installation through the cable entry box,
The second cable is pulled out from the electrical installation through the cable drawer.
Structures for underground power equipment. According to claim 1,
The cable entry box,
an inlet located at a lower portion of the cable inlet and into which the first cable is introduced from the outside; and
Located at the top of the cable inlet and including a passage groove through which the first cable introduced through the inlet is introduced into the power device installation box,
Structures for underground power equipment. According to claim 1,
The cable withdrawal box,
a pass-through groove located at an upper portion of the cable withdrawal box and through which the second cable is drawn from the power device installation box; and
It is located at the bottom of the cable withdrawal box and includes an outlet through which the second cable drawn out through the passage groove is withdrawn to the outside.
Structures for underground power equipment. According to any one of claims 2 to 3,
The passage groove is formed in a 'U' shape,
Structures for underground power equipment. According to any one of claims 2 to 3,
Further comprising a waterproof block mounted in the passage groove to prevent water from entering by installing the power device,
Structures for underground power equipment. delete According to claim 1,
In the upper cover,
A pipe is formed to guide the flow of air so that the air inside the power device installation box can be circulated to the outside.
Structures for underground power equipment. According to claim 7,
At one end of the pipe,
Equipped with a foreign substance inflow prevention body to prevent the inflow of external rainwater,
Structures for underground power equipment. In a transformer installed in an underground buried structure,
a transformer comprising a transformer core;
An enclosed space located on the side of the transformer unit and separated from the transformer unit, including an independent space in which a transformer protection device electrically connected to the transformer unit is installed,
In the upper part of the independent space, the upper hole of the fuse box is located,
Transformers. According to claim 9,
The transformer protection device,
Including Hallyu fuse and Bay-O-net fuse,
The current limiting fuse and the bayonet fuse are connected in series with each other,
Transformers. According to claim 10,
The current-limiting fuse or the bayonet fuse is replaceable through the upper hole of the fuse box,
Transformers. According to claim 10,
a first bushing into which a first cable is introduced from the outside; and
Further comprising a second bushing through which the second cable is withdrawn to the outside,
The first bushing and the second bushing are electrically connected to each other through a conductor,
The conductor is electrically connected to one end of the current-limiting fuse,
The other end of the current-limiting fuse is formed as an insulating bushing and is drawn into the transformer unit.
Transformers. delete In the opening and closing device installed in the underground buried structure,
A plurality of two-way (2-way) switchgear bushings located on both sides facing each other; and
And a switchgear manipulator positioned between the plurality of two-way switchgear bushings,
The plurality of two-way switchgear bushings and the switchgear manipulator,
Installed in the power equipment installation box of the underground buried structure,
The underground buried structure,
a cable entry box located on one side of the power device installation box and into which a first cable is introduced from the outside; and
Including a cable withdrawal box located on the other side of the power device installation box and leading a second cable to the outside,
switchgear.

Images