JP2023002920A - Switchgear cable laying structure - Google Patents

Abstract

To provide a switchgear cable laying structure capable of reducing work man-hours and work costs required for core removal by forming only one through-hole in the floor when guiding the control cable of a switchgear consisting of a plurality of adjacently arranged boxes installed on the floor to a tunnel under the floor through a through-hole formed by core removal from the floor.SOLUTION: A horizontal cable duct 31 extending substantially horizontally is provided on the top of a plurality of boxes 100, and the end of the horizontal cable duct 31 is connected to the outermost side wall of the plurality of boxes 100 to provide a vertical cable duct 32 that extends substantially vertically. A control cable 21 of each of the boxes 100 is pulled into the horizontal cable duct 31 from the upper surface of the box 100, guided through the vertical cable duct 32 to the floor surface, and is passed through one through-hole 51 formed by removing the core from the floor 60 and led to the tunnel under the floor.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying structure for a switchgear installed indoors, and more particularly to a cable laying structure for guiding control cables of the switchgear to tunnels under the floor through through holes formed by removing cores from the floor.

A metal-enclosed switchgear is configured by arranging adjacently in a line a plurality of boxes in which storage devices such as circuit breakers and disconnecting switches of a power supply system are housed in functional units. When such a switchgear is installed indoors, a plurality of boxes are arranged in a row on a frame installed on the floor and fixed (see Patent Documents 1 and 2). In order to route the existing control cables to the subfloor tunnels, it is necessary to coring the floor to form holes through which the control cables are routed to the tunnels.

JP 2020-127279 A JP 2012-95440 A

However, when the control cables 21 existing in each box 100 of the switchgear 1 are arranged along the left and right side walls of each box 100, the control cables are drawn into the sinus from each box 100. Additionally, two cored through holes 80 per box 100 are required. For this reason, for example, as shown in FIG. 11, there are six boxes 100 per bank (distribution line boxes 3, 4, 5, distribution transformer secondary box 6, in-station/GPT box 7, NGR box 8). ), this one set of switchgear 1 requires 12 (6×2) through-holes 80 for core extraction, which increases the number of core extraction operations, resulting in increased work man-hours and costs. There is an inconvenience of bulking up.

The present invention has been made in view of such circumstances, and the control cable of the switchgear consisting of a plurality of adjacently arranged boxes installed on the floor is passed through a through hole formed by removing the core from the floor. To provide a switchgear cable laying structure capable of reducing work man-hours and work costs required for core extraction by forming only one through-hole formed in the floor when guiding the cable to a tunnel under the floor. is the main issue.

In order to achieve the above object, a switchgear cable laying structure according to the present invention provides a switchgear in which a plurality of boxes are installed adjacently on a floor. A cable laying structure for inserting a through hole formed by coring the floor to guide it to a tunnel under the floor,
A horizontal cable duct extending substantially horizontally along the plurality of boxes is disposed above the plurality of boxes, and an end of the horizontal cable duct is provided on a side wall of the outermost portion of the plurality of boxes. A vertical cable duct that connects with the part and extends in a substantially vertical direction is arranged,
A control cable of each box is pulled into the horizontal cable duct from the upper surface of each box, passed through the horizontal cable duct, and then guided to the floor through the vertical cable duct, and the floor is formed by core removal. It is characterized in that it is guided to the sinus passage by passing through one of the through-holes.

Therefore, the control cables in each box are drawn into the horizontal cable duct from the upper surface of the box, run through the horizontal cable duct to the end connecting with the vertical cable duct, and then pass through the vertical cable duct to the floor surface. Since it is guided to the tunnel through one common through hole formed in the floor, it is sufficient to remove the core through one through hole in the floor, which can greatly reduce the number of man-hours and work costs. It becomes possible.

Here, the horizontal cable duct is configured by horizontally connecting horizontal duct constituent members provided for each box on the upper part of each box, and the vertical cable duct is configured by vertically connecting a plurality of vertical duct constituent members. It is good to connect and constitute.
According to such a configuration, it is possible to install the horizontal duct constituent members in advance for each box, and it is possible to easily cope with the case where the arrangement order of the boxes is changed. In addition, by configuring the vertical cable duct with a plurality of vertical duct constituent members, it becomes easier to carry and assemble the vertical duct constituent members when assembling them into the box body, and it is also easy to open the duct during work. Become.

Each duct-constituting member includes a frame formed of a frame member in a rectangular parallelepiped shape, a fixing surface of the frame to the box body, and a lid covering at least an opening surface excluding a connection surface with an adjacent duct-constituting member. It is good to configure with a plate.
With such a configuration, the cable duct can be easily installed in the box and can be easily retrofitted.

Furthermore, if the portion of the vertical cable duct facing the floor is deviated from the position where the through hole is formed, a floor-laying cable duct that communicates with the vertical cable duct may be provided up to the through hole.
There is no problem if the common through-hole can be provided directly under the vertical cable duct, but if the position of the pre-cored through-hole is not directly under the vertical cable duct and is formed in a position that is shifted. In this case, the cable duct for laying on the floor is further provided following the vertical cable duct, so that the inconvenience of the cable being exposed on the floor can be eliminated.

As described above, according to the switchgear cable laying structure according to the present invention, the control cables in each box are drawn into the horizontal cable duct from the upper surface of the box, and the inside of the horizontal cable duct is called the vertical cable duct. It is made to run to the end to be connected, after which it is led to the floor through the vertical cable duct, and is led to the tunnel by sharing one through hole formed in the floor, so there is only one through hole in the floor. It is possible to greatly reduce the number of man-hours and work costs compared to the conventional method.

If one common through-hole is not directly under the vertical cable duct and is formed at an offset position, a floor-laying cable duct is further provided following the vertical cable duct so that the cable can be placed above the floor. It becomes possible to improve the appearance.

1A and 1B are diagrams showing the overall configuration of an example of a switchgear cable laying structure according to the present invention, where (a) is a front view thereof and (b) is a side view thereof. FIG. 2 is a single line diagram of the switchgear. 3A and 3B are diagrams showing a horizontal duct constituting member, FIG. 3A being a perspective view showing components of the horizontal duct constituting member, and FIG. 3B being a perspective view of the horizontal duct constituting member. FIG. 4 is a perspective view showing a state in which the control cable is pulled into the horizontal cable duct from the upper surface of the box. FIG. 5 is a perspective view showing a vertical cable duct; FIG. 6 is a perspective view showing components of a vertical duct component. FIG. 7(a) is a diagram illustrating a state in which the control cable is passed through the vertical cable duct from the horizontal cable duct in the cable laying structure of FIG. FIG. 7(b) is a perspective view showing the vicinity of the through hole through which the control cable is passed. 8A and 8B are diagrams showing another cable laying structure example of the switchgear, where (a) is a front view thereof and (b) is a side view thereof. FIG. 9 is a perspective view showing cable ducts (horizontal cable duct, vertical cable duct, floor laying cable duct) used in the cable laying structure of FIG. FIG. 10(a) shows a state in which the control cable is passed through the vertical cable duct from the horizontal cable duct in the cable laying structure of FIG. FIG. 9B is a perspective view showing a state in which the control cable is led to the through hole via the floor laying cable duct. FIG. 11 is a diagram showing a conventional switchgear cable laying structure.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described based on the drawings.
1 and 2 show the overall configuration of a switchgear 1 installed indoors in an electrical station.

This switchgear 1 is composed of a plurality of boxes 100 connected to, for example, a 6 kV bus 2 laid in an electric station. A box 6, an in-house/GPT box 7, and an NGR box 8 are arranged adjacently in a row on a floor 60 via racks 1a to 1c.

The distribution box 3, 4 supplies electric power to the bus 2 through a vacuum circuit breaker (VCB) 9, a current transformer (CT) 10, and a zero-phase current transformer (ZCT) 11 provided in the box. It is connected to cable 12 .

The bus/distribution box 5 is connected to the power cable 12 via a vacuum circuit breaker (VCB) 9, a current transformer (CT) 10, and a zero-phase current transformer (ZCT) 11 with respect to the bus 2, It is also connected to another bank 29 via a vacuum circuit breaker (VCB) 9 .

The distribution secondary box 6 has a vacuum circuit breaker (VCB) 9 and a lightning arrester (LA) 13 connected to the bus 2, and the vacuum circuit breaker (VCB) 9 is shown via a current transformer (CT) 10. connected to a transformer that does not

The in-house/GPT box 7 is connected to the bus 2 with a potential transformer (GPT) 14 and a current-limiting fuse (LBS) 15, and is connected to a high-voltage transformer (HTr) 16 via the current-limiting fuse (LBS) 15. A wiring breaker (MCCB) 17 is connected to the secondary side of the high voltage transformer (HTr) 16 .

A grounding transformer (GTr) 19 is connected to the NGR box 8 via a high-voltage AC load switch (LBS) 18 to the bus 2, and a neutral point is connected to the secondary side of this grounding transformer (GTr) 19. A ground resistor (NGR) 20 and a current transformer (CT) 10 are provided.

The connection diagram shown in FIG. 2 shows the main circuit, and does not show the control cable 21, which will be described later.

A large number of control cables 21 are present in each box 100 (3 to 8), and these control cables 21 (21a to 21f) are bundled along the left and right sides of each box 100. , are connected to terminal blocks 22 (22a to 22f) on both left and right sides fixed in the box 100. As shown in FIG. Conventionally, each control cable 21 (21a to 21f) is pulled out from the lower part (bottom surface) of each box 100 and passed through a through hole formed by core removal directly below each box of the floor 60. However, in the present invention, they are led through one common through hole 51 cored in the floor 60 through the cable duct 30 described below to the tunnel under the floor.
Here, the control cable 21 is used, for example, for on/off control of a switch in the box 100, and for signal transmission of a display circuit, a relay protection circuit, a measurement circuit, and the like.

The cable duct 30 includes a horizontal cable duct 31 disposed above the plurality of boxes 100 (3 to 8) of the switchgear 1 and extending in a substantially horizontal direction, and a side wall at the end of the plurality of boxes 100. and a vertical cable duct 32 that is arranged in the vertical direction and connected to the end of the horizontal cable duct 31 and extends in a substantially vertical direction.

The horizontal cable duct 31 is configured by horizontally connecting horizontal duct forming members 31a to 31f provided for each box 100 on the upper portion of each box 100 (3 to 8). Each of the horizontal duct constituting members 31a to 31f has a length corresponding to the width of each box 100, and as shown in FIG. It is composed of a fixing surface (mounting surface) of the frame 33 to the box 100 and a rectangular cover plate 34 that closes the opening surface except for the connection surface with the adjacent duct component member. The rectangular cover plate 34 includes a cover plate 34a that closes the upper end face, cover plates 34b and 34c that cover the front and rear surfaces and has a vent 35, and a cover that closes the end face that is not connected to other duct constituting members. and a plate 34d. Incidentally, even if the vent holes 35 formed in the cover plates 34b and 34c are formed integrally with the cover plates 34b and 34c, openings are formed in the cover plates 34b and 34c and a separate member is attached. Also, the vent 35 may be formed in a mesh shape and may be formed in a slit shape (in the drawing, it is formed integrally in a mesh shape). if there is).

The frame 33 is fixed to the upper surface of the box 100 by bolts 36, each cover plate 34 (cover plates 34a to 34d) is also fixed to the frame 33 by bolts 36, and the adjacent frames 33 are also fixed by bolts 36. is fixed by

In this example, as shown in FIG. 4, cable insertion holes 50 are formed at two locations near the left and right ends of the upper surface of each box 100 for pulling out the control cable 21 upward from the box 100 .

Therefore, the horizontal cable duct 31 extends over the entire left and right width of the upper surface of the switchgear 1 so that the inside communicates with the inside of each box 100 via the cable insertion hole 50 . . In this example, the horizontal cable duct 31 is arranged such that its front surface is substantially flush with the front surface of each box (see FIG. 1(b)).

The vertical cable duct 32 is fixed to the side wall of the endmost box 100 (NGR box 8) of the switchgear 1, connected to the end of the horizontal cable duct 31 (horizontal duct component 31f), It extends substantially vertically along the side surface of the box 100 (NGR box 8) to the floor 60 or its vicinity (in this example, it extends to the floor 60).

As shown in FIG. 5, the vertical cable duct 32 is configured by vertically connecting a plurality of (two in this example) vertical duct forming members 32a and 32b. It is formed to have a length that is the sum of the height and the height of the horizontal cable duct 31 . As shown in FIG. 6, each of the vertical duct forming members 32a and 32b includes a frame 37 formed in a rectangular parallelepiped shape by a rod-shaped frame material, an attachment surface of the box 100, and an adjacent duct forming member. and a rectangular cover plate 38 that closes the opening surface excluding the connection surface with the .

The rectangular cover plate 38 has a cover plate 38a that closes the opening surface on the side opposite to the mounting surface of the box 100 and has a vent 39, cover plates 38b and 38c that cover the front and rear surfaces, and other vertical openings. and a cover plate 38d that closes the end surface of the upper end that is not connected to the duct constituting member. The vent 39 formed in the cover plate 38a may be formed integrally with the cover plate 38a, but may be constructed by forming an opening in the cover plate 38a and attaching a separate member. Alternatively, the vent 39 may be formed in a mesh shape and may be formed in a slit shape (the drawing shows a case where it is integrally formed in a mesh shape).

In the vertical cable duct 32 as well, the frame 37 is fixed to the side wall of the box 100 by bolts 36, the cover plate 38 is also fixed to the frame 37 by bolts 36, and the adjacent frames 37 are also fixed by bolts 36. ing.
Therefore, since the vertical cable duct 32 is formed to have a length that is the sum of the height of the box 100 and the pedestal 1c and the height of the horizontal cable duct 31, it faces the horizontal cable duct of the uppermost vertical duct component 32a. The portion that connects becomes an opening that communicates with the horizontal cable duct 31 , and this opening constitutes a cable introduction port 30 a for introducing the control cable 21 from the horizontal cable duct 31 to the vertical cable duct 32 .

At a position where the vertical cable duct 32 faces the floor surface 60 (immediately below the vertical cable duct 32), a single through hole 51 is formed by removing cores from the floor 60 and communicating with a tunnel (not shown) under the floor. It is
Therefore, as shown in FIGS. 7A and 7B, the vertical cable duct 32 extends from the end (cable inlet 30a) connecting to the horizontal cable duct 31 to the floor 60 so that the interior is in communication. It communicates with the tunnel under the floor through a through hole 51.

In the above configuration, the control cable 21 of each box 100 is drawn into the horizontal cable duct 31 from the cable insertion hole 50 on the upper surface of each box, and then directed through the horizontal cable duct 31 toward the vertical cable duct 32. After that, it is pulled into the vertical cable duct 32 and guided to the floor surface 60 through the vertical cable duct 32, and then passed through the through hole 51 formed directly under the vertical cable duct 32 to be guided to the tunnel. It becomes possible.

Therefore, since the through hole 51 serves as a common through hole for guiding the control cables 21 from the respective boxes 100 to the tunnel, the diameter of the through hole 51 is such that all the control cables 21 of the switchgear 1 can be passed through. Although it is necessary to form a large size, it is not necessary to remove cores from the through-holes for each box of the switchgear 1, and it is sufficient to form one through-hole 51. It is possible to greatly reduce the core removal work and work cost compared to the conventional method in which the core is formed.

In the above configuration, since the horizontal cable duct 31 and the vertical cable duct 32 are composed of a plurality of duct constituent members, the respective duct constituent members can be combined according to the number, width and height of the boxes. becomes possible. In particular, since the horizontal cable duct 31 is configured by horizontally connecting the horizontal duct constituting members 31a to 31f provided for each box on the upper part of each box 100, the horizontal duct constituting members 31a are arranged in box units. 31f can be installed in advance, and even when the order of arrangement of the boxes 100 is changed, it is possible to easily deal with it. In addition, since the vertical cable duct 32 is composed of a plurality of vertical duct constituent members 32a and 32b, it is easy to carry and assemble the vertical duct constituent members when assembling the vertical duct constituent members to the box 100. Detachment of the cover (opening of the duct) is also facilitated.

In the above configuration, an example is shown in which the core extraction hole (through hole 51) is formed directly below the vertical cable duct 32 (see FIGS. 7(a) and 7(b)). If the through hole 51 cannot be formed directly below the vertical cable duct, or if an existing through hole previously formed at a position displaced from the vertical cable duct is used, the floor laying cable duct 40 is further connected to the vertical cable duct 32. may be provided.

Examples thereof are shown in FIGS. 8 to 10, where the floor laying cable duct 40 is provided from the lower end of the vertical cable duct 32 (vertical duct component member 32b) to a position covering the through hole 51. FIG.

In this example, the floor-laying cable duct 40 consists of a first floor-laying duct component 40a laid substantially parallel to the switchgear 1 so as to cover the through-hole 51, and a vertical duct having a vertical cable duct 32 at one end. Second floor laying connected to the lower end of the component 32a and having the other end connected to the first floor laying duct forming member 40a to allow the vertical duct forming member 32b and the first floor laying duct forming member 40a to communicate with each other. and a duct component member 40b.

Therefore, the control cable 21 guided through the vertical cable duct 32 is connected to the lower end side surface of the lowermost vertical duct component 32b and the side surface of the first floor-installed duct component 40a. Cable introduction ports 30b and 30c are formed for introduction into the first floor laying duct component 40a via the member 40b.

Each of the floor-installed duct constituent members 40a and 40b has substantially the same structure as the horizontal duct constituent members 31a to 31f, so detailed description thereof is omitted. , a rectangular cover plate 41 (a cover plate 41 a covering the opening surface of the first floor-installed duct component member 40 a 41e, and cover plates 41f to 41h) for closing the opening surface of the second floor laying duct component 40b. Each lid is fixed to the frame with bolts, and adjacent frames are also fixed with bolts. It should be noted that each floor-surface-installed duct constituting member may be simply placed on the floor 60 without being fixed to the floor 60 with bolts or the like.

Therefore, according to such a configuration, as shown in FIG. 10, even if the through hole 51 is not directly below the vertical cable duct 32, the control cable 21 extending down the vertical cable duct 32 to the floor surface 60 is Since the control cable 21 is guided to the through hole 51 while being covered with the surface laying cable duct 40, the same effects as those of the configuration example shown in FIG. It is possible to improve the appearance without Moreover, it is possible to avoid the inconvenience of the control cable 21 spreading over the floor surface 60 .

In the above example, the vertical cable duct 32 is composed of two vertical duct constituent members 32a and 32b. good. Further, although the case where the floor-laying cable duct 40 is formed in an L shape by combining the two floor-laying duct constituent members 40a and 40b has been disclosed, the cable duct 32 is properly laid from the vertical cable duct 32 to the through hole 51. For example, the number of floor laying duct constituent members and the shape of the floor laying cable duct are not limited.
Furthermore, in the above configuration, the switchgear 1 with six boxes 100 as one set has been described. through holes) can be reduced.

1 switch gear 21 control cable 31 horizontal cable duct 31a to 31f horizontal duct component 32 vertical cable duct 32a, 32b vertical duct component 33, 37 frame 34, 38, 41 cover plate 40 floor laying cable duct 40a first Floor laying duct component 40b Second floor laying duct component 50 Cable insertion hole 51 Through hole 60 Floor 100 Box

Claims (4)

In a switchgear in which a plurality of boxes are installed adjacently on the floor, a through hole formed by removing a core from the floor for guiding control cables existing inside each box to a tunnel under the floor. A cable laying structure for inserting the
A horizontal cable duct extending substantially horizontally along the plurality of boxes is provided above the plurality of boxes, and an end of the horizontal cable duct is provided on a side wall of the outermost portion of the plurality of boxes. A vertical cable duct that connects with the part and extends in a substantially vertical direction is arranged,
The control cable of each box is pulled into the horizontal cable duct from the top surface of each box, guided to the floor through the vertical cable duct, and inserted through one through hole formed by core removal from the floor. A cable-laying structure, characterized in that the cable-laying structure is made to lead to the above-mentioned tunnel. The horizontal cable duct is configured by horizontally connecting horizontal duct constituting members provided for each box on the upper part of each box, and the vertical cable duct vertically connects a plurality of vertical duct constituting members. 2. The cable laying structure according to claim 1, wherein the cable laying structure is constructed as follows. The duct-constituting member includes a frame formed of a frame member in a rectangular parallelepiped shape, a fixing surface of the frame to the box, and a lid that covers at least an opening surface excluding a connection surface with an adjacent duct-constituting member. 3. The gable laying structure according to claim 2, wherein the gable laying structure comprises a plate. 2. A floor laying cable duct communicating with said vertical cable duct is provided up to said through hole when the portion of said vertical cable duct facing the floor is misaligned with said through hole. 4. The cable laying structure according to any one of 1 to 3.

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