JP7589187B2 - Ground installation equipment and cable fixing method - Google Patents

Description

The present invention relates to ground-mounted equipment, and more specifically to equipment that houses a transformer, a switch, a disconnector, etc., in the same box. It also relates to a method for fixing cables in the ground-mounted equipment.

Ground-mounted equipment is equipment that houses a transformer, switchgear, disconnector, etc. in an outer box, and is equipment for underground power distribution that is installed on roadsides, etc., so the connecting power cable needs to be pulled in from underground. Therefore, an opening is required to pull in the cable in the base that supports the outer box and transformer tank part located at the bottom of the equipment.

For example, transformer tanks are provided with fixed receivers to hold the pulled-in cable, and the cable is held in place by clamping the cable support and bolting the fixing bracket. The cable support and fixing brackets are also designed to minimize the opening area to prevent the intrusion of small animals and the inflow of moisture, but an opening for passing the cable through is essential. Therefore, if the cable is not inserted and installed, moisture that has flowed in from underground can accumulate. Also, in consideration of work efficiency, the number of parts is kept as small as possible when fixing the cable, and a simple structure is used.

JP 2004-260873 A

Conventional structures are unable to prevent moisture from entering when the cable is not inserted or installed. As a result, moisture that does enter stays inside the above-ground equipment, creating a humid environment inside the equipment, which has a detrimental effect on the painted surfaces of the outer box and transformer tank, for example.

The present invention aims to provide a ground-mounted device that can prevent moisture from entering even when the cable is not inserted or installed, and a cable fixing method for this ground-mounted device.

According to the present invention, the following aspect of ground-installed equipment is provided. The ground-installed equipment includes a cable support and a fixing device. The cable support has an insertion hole into which a cable connected to the equipment is inserted. The fixing device fixes the cable inserted into the insertion hole of the cable support. The fixing device is structured to open and close the insertion hole of the cable support by rotating and positioning it.

According to the present invention, the following cable fixing method is provided. This method is a cable fixing method for ground-installed equipment that includes a cable support having an insertion hole formed therein through which a cable connected to the equipment is inserted, and a fixture that fixes the cable inserted into the insertion hole of the cable support and that has a structure that opens and closes the insertion hole of the cable support by rotating and positioning it. In this method, (1) an operator takes out the fixture that blocks the insertion hole of the cable support, (2) an operator inserts a cable into the insertion hole of the cable support, and (3) an operator fixes the fixture in a state in which the cable support is compressed by the fixture.

The present invention can prevent moisture from entering the inside of the device through the cable insertion section. It can also prevent adverse effects such as rust and blister formation on the painted surface of the device due to moisture.

FIG. 2 is a perspective view showing an example of ground-based equipment. FIG. 2 is a view of cross section A in FIG. 1 as seen from above. FIG. 13 is a top view of the cable support and the fixing device. 4 is a cross-sectional view taken along line BB in FIG. 3. FIG. 13 is a view of the cable support and the fixture as viewed from above with the cable being inserted. 6 is a cross-sectional view taken along the line DD in FIG. 5. FIG. 13 is a view of the cable support and the fixture as seen from above with no cable inserted. FIG. 8 is a cross-sectional view taken along line CC of FIG. 7, illustrating the prevention of moisture intrusion. 4A to 4C are diagrams illustrating an example of the structure of a fixing tool used in the first embodiment. 6A to 6C are diagrams for explaining opening and closing of an insertion hole of a cable support by a fixing device used in the first embodiment. 13A and 13B are diagrams illustrating an example of the structure of a fixing device used in the second embodiment. 13A to 13C are diagrams for explaining opening and closing of an insertion hole of a cable support by a fixing device used in the second embodiment. 13A and 13B are diagrams illustrating an example of the structure of a fixing device used in the third embodiment. 13A to 13C are diagrams for explaining opening and closing of an insertion hole of a cable support by a fixing device used in the third embodiment. 13A and 13B are diagrams illustrating an example of the structure of a fixing device used in the fourth embodiment. 13A to 13C are diagrams for explaining opening and closing of an insertion hole of a cable support by a fixing device used in the fourth embodiment.

First, the overall structure of the ground-installed equipment will be described with reference to Figures 1 to 4 showing a conventional structure. Figure 1 is an example of ground-installed equipment, and is a perspective view showing the ground-installed equipment. Figure 2 is a view of cross section A in Figure 1 as seen from above. Figure 3 is a view of the cable support and fixing device as seen from above. Figure 4 is a view of cross section B-B in Figure 3.

As shown in FIG. 1, the ground-installed equipment has a box-like appearance and is configured to store equipment such as a transformer, a switch, and a disconnector inside. The ground-installed equipment includes an opening/closing door 101, a side plate 102, a base portion 103, and a top plate 104. The opening/closing door 101 is provided so that it can rotate around an end of the ground-installed equipment (in this example, the end on the right side of the front). The opening/closing door 101 is attached using a hinge or the like. The side plate 102 forms the side wall of the ground-installed equipment and is fixed between the base portion 103 and the top plate 104. The base portion 103 forms the base of the ground-installed equipment and supports the equipment to be stored. The top plate 104 is fixed to the side plate 102 and forms the upper wall of the ground-installed equipment.

As shown in FIG. 2, a transformer 105 is housed inside the ground-mounted equipment as an example of equipment. Also provided are a support member 106 and a frame 107. In this example, the support member 106 is configured to support a cable support 201, which will be described later. The frame 107 is configured to support a fixture 202p, which will be described later.

As an example, a plurality of support members 106 are provided so as to extend upward from the base portion 103. The frame 107 is a member that extends in the left-right direction, and as an example, is fixed to the base portion 103.

The base portion 103 also has an opening 108 for pulling in a cable that connects to a transformer 105, which is an example of equipment. In Figures 1 to 4, the ground visible through the opening 108 is shown by hatching for convenience.

As shown in Figures 3 and 4, a cable support 201 is connected to the transformer 105, and multiple insertion holes are formed in the cable support 201 for inserting cables. The cable support 201 is formed as a member that is compressed by pressing. As an example, the cable support 201 is welded to the transformer 105.

A fixing device 202p is disposed on the upper part of the frame 107. The fixing device 202p extends in one direction and is a member that an operator uses to fix a cable. The operator can fix the cable inserted in the cable support 201 by fixing the fixing device 202p to an appropriate member while pressing the cable support 201 with the cable inserted therein with the fixing device 202p.

First Embodiment
Next, the ground-installed equipment according to the first embodiment will be described with reference to Figures 5 to 10. Note that the description similar to that described above may be omitted. In the first embodiment, the structure of the fixture is different from that described above.

First, an overview of the structure for preventing moisture from entering the inside of the device in each embodiment will be described with reference to Figs. 5 to 8. Fig. 5 is a diagram of the cable support and the fixture as viewed from above when the cable is inserted. Fig. 6 is a diagram of the D-D cross section in Fig. 5. Fig. 7 is a diagram of the cable support and the fixture as viewed from above when the cable is not inserted. Fig. 8 is a diagram of the C-C cross section in Fig. 7, and is used to explain the prevention of moisture inflow.

As shown in Figures 5 and 6, when a cable is to be inserted, the fixture 202 is positioned so that it does not block the insertion hole of the cable support 201, allowing the cable to be inserted. On the other hand, as shown in Figures 7 and 8, when a cable is not to be inserted, the fixture 202 is positioned with its orientation changed so that it blocks the insertion hole of the cable support 201. This prevents moisture from entering.

In addition, the arrow A in Figure 8 shows a schematic diagram of the inflow of moisture from the underground portion being stopped because the fastener 202 is blocking it. Also, in Figure 7, for convenience, the fastener 202 blocking the insertion hole of the cable support 201 is shown by hatching.

Next, the structure of the fastener in the first embodiment will be specifically described with reference to Figures 9 and 10. Figure 9 is a diagram showing an example of the structure of the fastener used in the first embodiment. Figure 10 is a diagram for explaining the opening and closing of the insertion hole of the cable support by the fastener used in the first embodiment.

9 and 10, the fastener 202a has a T-shaped cross section and includes a horizontal first portion 202a1 and a second portion 202a2 that rises vertically at the center of the width of the first portion 202a1. The first portion 202a1 is provided with a bolt hole 202a3 that is used to fasten the cable to the transformer 105, and the second portion 202a2 is provided with a bolt hole 202a4 that is used to fasten the cable to the frame 107, when the cable is fixed.

As shown in FIG. 10, according to the first embodiment, the insertion hole of the cable support 201 can be opened and closed by rotating and positioning the fastener 202a in an appropriate direction. The cable support 201 with the cable inserted therein is pressed by the first portion 202a1, and the fastener 202a is fastened and fixed through the bolt holes (202a3, 202a4), thereby fixing the cable inserted in the cable support 201. At this time, the cable support 201 can be pressed by the first portion 202a1 by tightening the bolt through the bolt hole 202a3 of the first portion 202a1. In addition, when no cable is inserted, as an example, the fastener 202a is supported by the frame 107 as a support portion, and the insertion hole of the cable support 201 is blocked by the first portion 202a1, thereby preventing moisture from entering the above the ground-installed equipment through the insertion hole of the cable support 201.

Note that it is sufficient to be able to open and close the insertion hole of the cable support 201 and to fix the cable. For example, the dimensions of the fixing device 202a and the positions and number of openings such as bolt holes can be set (changed) as appropriate.

The dimensions of the support member 106 may be set so as to support the fixture 202a that covers the cable support 201. In this case, the support member 106 and the frame 107 become the support part for the fixture 202a that covers the cable support 201. Note that the support member 106 is arranged so as not to overlap the insertion hole of the cable support 201 when viewed from above, for example, so as not to impede the insertion of the cable.

A protrusion or projection that supports the fixing device 202a that blocks the insertion hole of the cable support 201 between the fixing device 202a and the lower part of the cable support 201 may be provided as a support part. Here, as an example, the protrusion or projection is connected to the transformer 105 so as to protrude from the transformer 105. As above, as an example, the protrusion or projection is provided so as not to overlap the insertion hole of the cable support 201 when viewed from above so as not to interfere with the insertion of the cable.

Second Embodiment
Next, a ground-installed device according to a second embodiment will be described with reference to Figs. 11 and 12. Note that the same description as that described above may be omitted. In the second embodiment, the structure of the fixture is different from that described above.

11 and 12, the fixing device 202b has a T-shaped cross section, as in the first embodiment, and includes a horizontal first portion 202b1 and a second portion 202b2 perpendicular to the first portion 202b1 at the center of the width of the first portion 202b1. The fixing device 202b is made of a non-metallic material such as a non-magnetic material, rubber, or plastic that can suppress eddy current loss so that it can be easily molded, and a plurality of openings 202b3 (round holes in this example) that communicate with the insertion hole of the cable support 201 are formed on one side of the first portion 202b1 between which the second portion 202b2 is sandwiched. In addition, bolt holes (202b4, 202b5) used for fastening and fixing to the transformer 105 are formed on one side of the first portion 202b1 and the second portion 202b2.

As shown in FIG. 12, according to the second embodiment, with the cable inserted into the opening of the first portion 202b1 and the insertion hole of the cable support 201, the cable support 201 is compressed by the second portion 202b2 while the fastener 202b is fastened and fixed, thereby fixing the cable. At this time, the cable support 201 can be pressed by the second portion 202b2 by tightening the bolt through the bolt hole 202b5 of the second portion 202b2.

Note that, with respect to the first portion 202b1 of the fixing device 202b, the width dimension of one side on which the above-mentioned multiple openings 202b3 are formed may be set to be shorter than the width dimension of the cable support 201. Here, the dimensions may be set so that a predetermined amount of compression is achieved when the cable support 201 is compressed until there is no gap between it and the transformer 105 (i.e., until it abuts against the transformer 105). In this way, it is possible to specify the amount of compression and prevent excessive compression.

Third Embodiment
Next, a ground-installed device according to a third embodiment will be described with reference to Figs. 13 and 14. Note that the same description as that described above may be omitted. In the third embodiment, the structure of the fixture is different from that described above.

13 and 14, the fixing device 202c has an L-shaped cross section and includes a first portion 202c1 and a second portion 202c2 perpendicular to the first portion 202c1 at the widthwise end of the first portion 202c1. The second portion 202c2 is formed with a bolt hole 202c3 for fastening to the transformer 105. The first portion 202c1 may be formed with a bolt hole for fastening to the frame 107. The bolt hole may be formed at a position that does not overlap the insertion hole of the cable support 201 when the fixing device 202c blocks the insertion hole.

As shown in FIG. 14, according to the third embodiment, the insertion hole of the cable support 201 can be opened and closed by rotating and positioning the fastener 202c in an appropriate direction. The cable inserted into the cable support 201 is then fixed by fastening it through the bolt hole while pressing the cable support 201 with the cable inserted therein. At this time, the cable support 201 can be pressed by the second portion 202c2 by tightening the bolt through the bolt hole 202c3 of the second portion 202c2. In addition, when no cable is inserted, the insertion hole of the cable support 201 can be blocked to prevent moisture from entering above the ground-installed equipment through the insertion hole of the cable support 201.

Fourth Embodiment
Next, a ground-installed device according to a fourth embodiment will be described with reference to Figs. 15 and 16. Note that the same description as that described above may be omitted. In the fourth embodiment, the structure of the fixture is different from that described above.

15 and 16, the fixing device 202d has an L-shaped cross section, as in the third embodiment, and includes a first portion 202d1 and a second portion 202d2 perpendicular to the first portion 202d1 at the widthwise end of the first portion 202d1. The fixing device 202d is made of a non-metallic material such as a non-magnetic material, rubber, or plastic that can suppress eddy current loss so that it can be easily molded, and the first portion 202d1 has a plurality of openings 202d3 (round holes in this example) that communicate with the insertion hole of the cable support 201. In addition, the first portion 202d1 and the second portion 202d2 have bolt holes (202d4, 202d5) used for fastening and fixing to the transformer 105.

According to the fourth embodiment, the insertion hole of the cable support 201 can be opened and closed by rotating and positioning the fixing device 202d in an appropriate direction. The cable inserted into the cable support 201 is fixed by pressing and fixing the cable support 201 with the cable inserted therein. At this time, the cable support 201 can be pressed by the second portion 202d2 by tightening the bolt through the bolt hole 202d5 of the second portion 202d2. Furthermore, when no cable is inserted, the insertion hole of the cable support 201 can be blocked to prevent moisture from entering from the insertion hole of the cable support 201 to above the ground-installed equipment.

Note that the width dimension of the portion of the fixing device 202d where the above-mentioned multiple openings are formed may be set to be shorter than the width dimension of the cable support 201. Here, the dimensions may be set so that a predetermined amount of compression is achieved when the cable support 201 is compressed until there is no gap between the transformer 105 (i.e., until it abuts against the transformer 105). In this way, it is possible to specify the amount of compression and prevent excessive compression.

Next, an example of a cable fixing method using the fixing tool described in the embodiment will be described. When an operator places the fixing tool 202 described in the above embodiment so as to block the insertion hole of the cable support 201, moisture is prevented from entering through the insertion hole. When connecting a cable to a device (transformer 105 in the example embodiment), as an example, an operator can take out the fixing tool 202 that blocks the insertion hole of the cable support 201, insert the cable into the insertion hole of the cable support 201 (or additionally, the opening of the fixing tool 202 rotated in this case), and fix the fixing tool 202 in a state in which the cable support 201 is compressed by the fixing tool 202, thereby fixing the cable.

Although the embodiment has been described above, the present invention is not limited to the above embodiment and includes various modifications. For example, it is possible to add, delete, or replace part of the configuration of the embodiment with other configurations.

The position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

The arrangement of the opening and closing doors 101 is not limited to the above example, and may be changed as appropriate depending on the arrangement of the stored equipment, for example, to make work easier. In addition, multiple opening and closing doors may be provided, for example, an opening and closing door that rotates around the end on the left side of the front of the ground-installed equipment, and an opening and closing door that rotates around the end on the right side of the front of the ground-installed equipment.

When the fixing device 202 is used to block the insertion hole of the cable support 201, the fixing device 202 may be placed on the surface or fixed to an appropriate member.

The transformer 105 may include a member used to fasten the fastener 202 having a bolt hole formed therein. As an example, this member is provided so as to protrude toward the cable support 201 so that the cable support 201 is positioned in the left-right direction.

101 Opening and closing door 102 Side plate 103 Base portion 104 Top plate 105 Transformer 106 Support member 107 Frame 108 Opening 201 Cable support 202 Fixture

Claims (9)

a cable support having an insertion hole into which a cable connected to the device is inserted;
a fastener for fastening a cable to be inserted into the insertion hole of the cable support;
Equipped with
The fixing device is
The cable support has a structure that opens and closes the insertion hole of the cable support by rotating and disposing the cable support.
The dimensions of the fixture are set so that a gap is provided between the device and the fixture that defines an amount of compression that will compress the cable support when the cable is secured.
A ground-mounted device characterized by : The ground-based equipment according to claim 1,
The fixing device is
It is made of non-metallic
A ground-mounted device characterized by: The ground-installed equipment according to claim 2,
The fixing device is
It is made of a non-magnetic material, rubber, or plastic that reduces eddy current loss.
A ground-mounted device characterized by: a cable support having an insertion hole into which a cable connected to the device is inserted;
a fastener for fastening a cable to be inserted into the insertion hole of the cable support;
Equipped with
The fixing device is
The cable support has a structure that opens and closes the insertion hole of the cable support by rotating and disposing the cable support.
The fixing device is
The insulating layer extends in one direction and includes a first portion and a second portion that is perpendicular to the first portion at a widthwise center of the first portion,
The first portion and the second portion are formed with bolt holes used to fix the cable support in a compressed state.
A ground-mounted device characterized by : a cable support having an insertion hole into which a cable connected to the device is inserted;
a fastener for fastening a cable to be inserted into the insertion hole of the cable support;
Equipped with
The fixing device is
The cable support has a structure that opens and closes the insertion hole of the cable support by rotating and disposing the cable support.
The fixing device is
The insulating layer extends in one direction and includes a first portion and a second portion that is perpendicular to the first portion at a widthwise center of the first portion,
an opening for inserting a cable when fixing the cable is formed on one side of the first portion between the second portion and the cable;
A bolt hole is formed on one side of the first portion and the second portion to fix the cable support in a compressed state.
A ground-mounted device characterized by : a cable support having an insertion hole into which a cable connected to the device is inserted;
a fastener for fastening a cable to be inserted into the insertion hole of the cable support;
Equipped with
The fixing device is
The cable support has a structure that opens and closes the insertion hole of the cable support by rotating and disposing the cable support.
The fixing device is
The insulating film extends in one direction and includes a first portion and a second portion that is perpendicular to the first portion at one end of the first portion in a width direction.
The second portion is formed with a bolt hole used for fixing the cable support in a compressed state.
A ground-mounted device characterized by : a cable support having an insertion hole into which a cable connected to the device is inserted;
a fastener for fastening a cable to be inserted into the insertion hole of the cable support;
Equipped with
The fixing device is
The cable support has a structure that opens and closes the insertion hole of the cable support by rotating and disposing the cable support.
The fixing device is
The insulating film extends in one direction and includes a first portion and a second portion that is perpendicular to the first portion at one end of the first portion in a width direction.
an opening for inserting a cable when fixing the cable is formed in the first portion;
The first portion and the second portion are formed with bolt holes used to fix the cable support in a compressed state.
A ground-mounted device characterized by : a cable support having an insertion hole into which a cable connected to the device is inserted;
a fixing device that fixes a cable to be inserted into the insertion hole of the cable support, the fixing device being configured to open and close the insertion hole of the cable support by rotating and disposing the fixing device;
A cable fixing method for a ground-mounted device comprising:
(1) An operator removes the fixing tool that closes the insertion hole of the cable support,
(2) An operator inserts a cable into the insertion hole of the cable support,
(3) An operator fixes the fixing tool in a state in which the cable support is compressed by the fixing tool.
A cable fixing method comprising the steps of: The cable fixing method according to claim 8 ,
The dimensions of the fixture are set so that a gap is formed between the device and the fixture that defines an amount of compression for compressing the cable support when the cable is fixed;
The operator fixes the fixing tool in a state in which the cable support is compressed until the fixing tool abuts against the equipment.
A cable fixing method comprising the steps of:

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