KR101653403B1 - Protection joint for protection plate of underground cable - Google Patents

Protection joint for protection plate of underground cable Download PDF

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Publication number
KR101653403B1
KR101653403B1 KR1020160006495A KR20160006495A KR101653403B1 KR 101653403 B1 KR101653403 B1 KR 101653403B1 KR 1020160006495 A KR1020160006495 A KR 1020160006495A KR 20160006495 A KR20160006495 A KR 20160006495A KR 101653403 B1 KR101653403 B1 KR 101653403B1
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KR
South Korea
Prior art keywords
plate
underground cable
plates
connector
bending
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Application number
KR1020160006495A
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Korean (ko)
Inventor
조성인
Original Assignee
주식회사 에스지이엔지
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Priority to KR1020160006495A priority Critical patent/KR101653403B1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G9/00—Installations of electric cables or lines in or on the ground or water
    • H02G9/02—Installations of electric cables or lines in or on the ground or water laid directly in or on the ground, river-bed or sea-bottom; Coverings therefor, e.g. tile

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  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

The present invention relates to a joining structure for protection plates of an underground cable which, more specifically, joins the protection plates, continuously molded by extrusion to have a long length, in an easy manner and thus maintains a stable, underground installation state of the underground cable. The joining structure comprises protection plate joining parts (50), which are joined to a plurality of underground cable protection plates, installed underground, and join a plurality of the underground cable protection plates. The protection plate joining parts (50) are inserted in and joined to shape maintaining through-holes (20) formed on one side of a plate (10) of both underground cable protection plates.

Description

PROTECTION JOINT FOR PROTECTION PLATE OF UNDERGROUND CABLE [0002]

The present invention relates to a connection structure of shield plates for an underground cable shield plate, and more particularly, to a shield plate for an underground cable shield plate which enables a ground cable shield plate formed by continuous extrusion to be easily connected, As shown in FIG.

Generally, in the use of electricity, in order to supply electricity between users using generic electricity from a power generation facility, transmission and reception of electric power through electric wires are involved. In order to transmit and receive traditional electric power, ground electric pole is used, but when necessary, electric power is transmitted by buried in the ground.

Especially in recent years, as the industrialization and the informationization are accelerated, the power consumption and the information communication amount are rapidly increasing. Accordingly, the facilities for power supply and signal transmission are required to be further expanded and securely installed.

Generally, a line used for power transmission / reception, communication, etc. is made of a sheathed wire. Especially, these wires are installed in a way that a hollow is formed in the ground and wired or buried in the ground in consideration of various reasons such as urban beauty.

Thus, once embedded in the ground, the wires remain buried in the ground for a long period of time, unless there are special circumstances. However, the maintenance and repair works of wires, pavement construction of roads and construction of other underground facilities such as gas pipes and water pipes There may be work to be done later, and therefore it is inevitable to re-excavate the underpass. At this time, underground cable shields are usually installed on top of the buried cable, because careless excavation may damage the cables in the ground.

A conventional underground cable shielding plate is disclosed in Patent Registration No. 10-0473328 or Utility Model Registration No. 20-0411615. In such a conventional protection plate, a plurality of compensation ribs are formed on the plate to protect the underground cable from excavation equipment such as an excavator during excavation for repairing and replacing the underground cable, and a plurality of compensation ribs So that a projection is formed and used. Especially, since the underground cable shielding plates are individually manufactured one by one, it takes a long time to manufacture them, resulting in an increase in manufacturing costs, which is an obstacle to mass production. It is more difficult to manufacture due to the complexity of the protruding parts such as protrusions and ribs and the like shape like a net, and it is difficult to manage.

In particular, there is a need for a technique that makes it easier to assemble a protective plate installed in the ground with a rigid mounting state.

Registered Patent No. 10-0473328 (published on Mar. 07, 2005) Registered Utility Model No. 20-0411615 (Notice of March 16, 2006)

In order to solve the above-mentioned problems, the present invention provides an underground cable shielding plate in which long grooves are formed on the upper surface of the plate having a large area plane and long protrusions are formed below to prevent deformation of the shape, So that a plurality of pieces can be easily fastened, thereby facilitating installation in the ground.

Another object of the present invention is to provide a stable shielding plate by easily connecting to a through hole of an underground cable shielding plate which has a long longitudinal hole formed inside the body to lighten the overall weight and save the material.

According to an aspect of the present invention, there is provided an underground cable shielding plate for a underground cable shielding plate, the underground cable shielding plates being connected to a plurality of underground cable shielding plates installed in the ground, And the shield plate connector 50 is inserted into the shape retaining hole 20 formed on one side of the plate 10 of the underground cable shield plates.

In a preferred embodiment of the present invention, a connector outer surface 51 inserted into the shape retaining hole 20 formed at one side of the plate 10 of the underground cable shield plates and abutting against the inner wall surface of the shape retaining hole 20; And a connector through hole (52) penetrating in the longitudinal direction in the inside.

In the preferred embodiment of the present invention, the connecting port outer surface 51 is formed with a connecting protrusion protrusion 53, which is a plurality of protrusions protruding outwardly. In the state where the connecting protrusion 53 is inserted into the shape retaining hole 20, Characterized in that the fixing protrusion (53) is pressed against the inner wall surface of the shape retaining hole (20) to prevent the shield plate connector from escaping from the shape retaining hole (20) do.

In the preferred embodiment of the present invention, a plurality of underground cable shield plates installed in the ground are installed to be coupled to each other, and a bending connection pin 61 for an underground cable shield plate connecting a plurality of underground cable shield plates is provided at one side, The underground cable protection plate connected to both sides of the bending connection body (62) includes a bent connection body (62) formed with a bending connection pin (61) at one side or both sides and having a curved shape as a whole, And a bending connector for a protection plate for an underground cable shielding plate.

A bending lower fixing blade 63 is formed on the lower surface of the bending connection body 62 and a bending connection body 62 corresponding to the bending lower fixing blade 63 is formed on the upper surface of the bending connection body 62. [ And a water flow valley (64) is formed on the bottom wall of the underfloor cable shielding plate.
In a preferred embodiment of the present invention, a plurality of underground cable shield plates 100 installed in the ground; A plurality of ground cable protection plates 100 installed in the ground are installed in a plurality of the ground cable protection plates 100, and a plurality of underground cable protection plates are connected to the underground cable protection plate protection plate connection port 50, Wherein the protection plate connector 50 is inserted into a shape retaining hole 20 formed at one side of the plate 10 of both side underground cable protection plates and the protection plate connector 50 is connected to the plate 10 of the underground cable protection plates, A connecting port outer surface (51) inserted into the shape retaining hole (20) formed on one side surface and contacting the inner wall surface of the shape retaining hole (20); And a connecting through hole (52) penetrating in the longitudinal direction, wherein when the direction of installation of the plurality of underground cable protecting plates (100) is changed, And a plurality of underground cable protection plates 100 are formed in a straight line shape and are provided in a curved shape. The protection plate flexure connection ports 60 are formed by connecting underground cable A plurality of baffle connection pins 61 for underground cable shielding plates for connecting a plurality of underground cable baffle plates are provided on one side and bending connection pins 61 are formed on one side or both sides of the baffle connection pins 61, And the underground cable shield plate connected to both sides of the bending connection body (62) has a direction It provides a connection structure of the shroud cover for underground cable, characterized in that differently formed.
In the preferred embodiment of the present invention, the connecting port outer surface 51 is formed with a connecting protrusion protrusion 53, which is a plurality of protrusions protruding outwardly. In the state where the connecting protrusion 53 is inserted into the shape retaining hole 20, The protruding protrusion 53 is pressed against the inner wall surface of the shape retaining hole 20 to prevent the protruding connector from separating from the shape retaining hole 20 and the underground cable shield plate 100 has a large area A plate 10 in the form of a flat plate; A lower fixing blade 30 protruding in the longitudinal direction in the longitudinal direction at the lower surface of the plate 10 to prevent rocking in the ground; And an upper water flow valley (40) forming a groove having a long length in the longitudinal direction on the upper surface of the plate (10), wherein the upper water flow valley (40) And the lower stationary vane 30 has lower airbag protrusions 31 and 31 'protruding laterally from the lower stationary vane 30 and the lower airbag 30' ) 31 'may be a circular lowering protrusion formed by a protrusion protruding sideways and having a round shape below the lower stationary vane 30, or a lower protrusion protruding laterally from the lower stationary vane 30 in a triangular shape The protruding protrusions are formed in a triangular protrusion-like lowering protuberance.

The present invention constructed as described above has a structure in which a long groove is formed on the upper surface of a plate having a large area and a long protrusion is formed to prevent deformation of the shape, So that it is easy to install in the ground.

Further, another effect of the present invention is to provide a stable shielding plate by easily connecting to a through hole of an underground cable shielding plate, which also allows long longitudinal holes to be formed in the inside of the body to lighten the overall weight and save material.

Particularly, another effect of the present invention is that even if the direction of installation of the underground cable shielding plate installed in the ground is changed, it is possible to have a free installation state by the bending connector.

Another advantage of the present invention is that a long length of bending grooves is formed on the upper surface of the plate and a long bending protrusion is formed on the lower surface of the plate, So that it is convenient to carry.

1 is a perspective view of an underground cable shield according to the present invention.
FIG. 2 is a cross-sectional view illustrating an embodiment in which a lower fixed blade of the underground cable protection plate according to the present invention is formed as a round protrusion.
FIG. 3 is a cross-sectional view illustrating an embodiment in which the lower side of the lower fixed blade of the underground cable protection plate according to the present invention is formed with a projection projecting in a lateral direction as a triangle.
4 is a plan view of an underground cable shield according to the present invention.
FIG. 5 is a view showing an embodiment in which a plurality of underground cable protection plates according to the present invention are stacked. FIG.
6 is a schematic perspective view of a manufacturing apparatus for manufacturing an underground cable shielding plate in the present invention.
7 is a view illustrating an embodiment in which the upper surface forming unit forming the upper water flow bone is pressed by the manufacturing apparatus for manufacturing the underground cable protection plate according to the present invention.
8 is a view illustrating an embodiment in which the upper surface forming unit for forming the upper water flow bone is formed in a roller shape in the manufacturing apparatus for manufacturing the underground cable protection plate in the present invention.
9 is a view schematically showing a process of manufacturing an underground cable shielding plate by a manufacturing apparatus for manufacturing an underground cable shielding plate in the present invention.
10 is an exploded perspective view showing that an underground cable shield plate positioned at both sides is coupled by a shield plate connector for an underground cable shield plate according to the present invention.
11 is a perspective view of an embodiment of a protection plate connector for an underground cable protection plate according to the present invention, in which a through hole is formed at the center.
12 is a front view of an embodiment of a protection plate connector for an underground cable protection plate according to the present invention, in which a through hole is formed at the center.
13 is a perspective view of an embodiment of a protection plate connector for an underground cable shield according to the present invention, in which a through hole is formed at the center and a protrusion is formed on the outer surface.
FIG. 14 is a front view of an embodiment of a protection plate connector for an underground cable protection plate according to the present invention, in which a through hole is formed at the center and a protrusion is formed on the outer surface. FIG.
FIG. 15 is a view illustrating an example of separation of a use state of an embodiment in which a bending connector of a protection plate for an underground cable protection plate according to the present invention has a curved shape.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

That is, in the present invention, the connecting structure of the underwater cable shielding plates including the underground cable shielding plate 100 is the same as that of the underground cable shielding plate and its manufacturing apparatus in FIGS. 1 to 15, 10 to 15, etc., the underground cable shield plate 100 installed in the ground is formed in a generally flat plate shape so as to protect the electric wire from the external force applied from the upper portion while indicating the position of the electric wire buried in the ground. Respectively.

The underground cable protection plates 100 are provided in a plurality of units and connected to each other, and thus the protection plate connection unit 50 connecting the plurality of underground cable protection plates 100 is described. In particular, as shown in FIG. 10 to FIG. 14, when a plurality of underground cable protection plates 100 are connected to each other through a simple connection of a protection plate connector 50 and a plurality of underground cable protection plates 100 as shown in FIG. 15, And a protection plate bending connector 60 connected in a curved shape. Thus, the underground cable protection plates 100 may be installed optimally according to a situation where the underground cable protection plates 100 are installed in the ground or bent in a curved shape in a straight line.

First, prior to the description of the protection plate connector according to the present invention, the underground cable protection plate 100 installed in the ground will be described in detail. A plate 10 having a large area is provided, On the upper surface of the plate 10, a state of embedding of electric wires is indicated by film, printing, or the like, or an emergency telephone is indicated.

A lower fixing blade 30 protruding from the lower surface of the plate 10 in the longitudinal direction to prevent rocking in the paper is provided to prevent movement to another position in a state where the lower fixing blade 30 is installed in the ground. So that the underground cable shield plate 100 is always positioned on the upper side where the electric wire is buried.

As shown in FIG. 2, the lower stationary vane 30 is provided with a circular lowering protuberance 31 formed by a round protrusion on the lower side of the lower stationary vane 30.

And a triangular projection-like lowering protrusion 31 'made of a protrusion protruding laterally from the lower fixed blade 30 in a triangular shape. Thus, even when the plate 10 is pressed from the upper part, the lower fixing vane 30 can be easily inserted into the ground, so that the lower fixing vane 30 can be easily inserted into the ground.

In addition, such a lowering projection can be stably maintained in a plurality of stacked states during transportation by preventing it from falling easily even after it is inserted into the upper water flow valley 40 of another underground cable shielding plate stacked below .

Next, the underground cable protection plate 100 includes an upper water flow valley 40 which forms a groove having a long length in the longitudinal direction on the upper surface of the plate 10.

In particular, the upper water flow channel 40 is formed at a position corresponding to the lower stationary vane 30 below.

Thus, when a plurality of underground cable protection plates 100 are stacked vertically, the lower lower fixed wings of the upper underground cable protection plate are inserted into the upper upper water flow passage 40 of the lower underground cable protection plate so that the underground cable protection plates can be easily stacked So that the laminated state can be stably maintained even when there is fluctuation during transportation in a laminated state.

The plate 10 has a predetermined thickness, and the plate 10 is formed with a plurality of shape retaining holes 20 through which the plate 10 passes in the longitudinal direction.

As the shape retaining hole 20 is formed so as to penetrate through the plate 10 in the lateral direction of the plate 10, the shape of the underground cable shield plate 100 is constantly formed by the shape retaining hole 20 even if heat or pressure is applied Thereby maintaining the formed state. Also, it is possible to reduce the amount of material excluded by the shape retaining hole 20, while also helping to reduce the weight.

As described above, in the underground cable protection plate 100, which is generally in the form of a flat plate having a large area, the upper surface of the plate 10 is formed with the upper water flow trough 40 in the longitudinal direction, A plurality of through holes 20 are formed at the center of the body 10 between the upper water flow groove 40 and the lower fixing blade 30 and the shape retaining through holes 20, 20 to prevent the underground cable shield plate 100 from being twisted as a whole.

In particular, the underground cable protection plate 100 is formed by extrusion so that the shape retaining hole 20, the lower fixing blade 30, the upper water flow troughs 40, and the like are formed to be long in the longitudinal direction. .

To this end, a protection plate manufacturing apparatus 70 for manufacturing an underground cable protection plate 100 according to the present invention is provided.

6 to 9, a plate extruder 71 for forming the plate 10 of the underground cable shielding plate by a long length is provided. So that the plate 10, which is generally large in area, is continuously extruded.

And an upper sheet extruder 72 for producing a sheet adhered to the upper surface of the plate 10 is provided. Alternatively, in the case where the sheet is already prepared in place of the upper sheet extruder 72, it may be replaced with a sheet roll rolled up. Thus, a film can be formed in necessary colors such as yellow, red, and coated on the upper surface of the plate 10.

Further, a printing machine 74 for printing characters and patterns on the upper surface of the plate 10 is provided.

By this printing machine 74, a guiding text or figure like the one shown in FIG. 4 and the like is printed on the upper surface of the plate 10. Of course, a device such as a coating device or a drying device may be further provided to stabilize the printed state.

In addition, a cutter 75 for cutting the plate 10, which is formed by a long length by an extruder, into a predetermined length to form an underground cable protection plate of the unit body. That is, the continuously manufactured products are cut by the cutter 75 to a predetermined length so as to be made into one individual underground cable shielding plate 100.

And an upper surface forming unit 73 for forming upper water flow troughs 40 on the upper surface of the plate 10.

Thereby forming a plurality of upper water flow troughs 40. As shown in FIG. 7, in the manufacturing apparatus for manufacturing such an underground cable shielding plate, the upper surface forming unit 73 forming the upper water flow channel 40 is composed of a pressing type for pressing the upper surface of the plate from above, A press forming portion 731 for forming the valley 40 may be provided.

8, in the manufacturing apparatus for manufacturing the underground cable shielding plate, the upper surface forming unit 73, which forms the upper water flow troughs 40, is formed in the form of a roller so as to form the upper water flow trough 40, A roller forming portion 732 protruding from the outer surface may be provided.

As a result, an upper water flow trough 40 having a long longitudinal groove formed on the upper surface of the plate 10 is formed so that water flowing on the upper surface in the state of being installed on the ground is drained along the upper water flow trough 40 will be.

The underground cable shielding plate 100 provided as described above is provided with the shielding plate connector 50 according to the present invention in a pin shape inserted into the shape retaining hole 20 having a through hole formed in the longitudinal direction.

That is, a plurality of underground cable shield plates installed in the ground are installed in a plurality of the ground guard plates, and the underground cable shield plate 50 is connected to a plurality of underground cable shield plates.

The shroud connector 50 is inserted into the shape retaining hole 20 formed on one side of the plate 10 of the underground cable shields. As a result, a plurality of underground cable shield plates 100 can be stably maintained in a state where they are coupled to each other.

A connecting port outer surface (51) inserted into the shape retaining hole (20) formed on one side surface of the plate (10) of the underground cable protecting plates and contacting the inner wall surface of the shape retaining hole (20) And includes a connector through hole 52.

Through this through-hole 52, the overall weight is reduced and the cost is reduced.

In addition, the connector outer surface 51 is formed with a connector fixing protrusion 53, which is a plurality of protrusions protruding outwardly.

That is, since the connector fixing protrusion 53 is pressed against the wall surface of the shape retaining hole 20 in a state where the shield plate connector is inserted into the shape retaining hole 20, the shield plate connector is detached from the shape retaining hole 20 .

The shape of the connector fixing protrusion 53 may be variously modified so that the protector connector 50 inserted from the shape retaining hole 20 of the plate 10 is not detached. In particular, if the inclined surface is formed in the marginal direction, it will fit easily when fitted and will not fall out easily.

Next, a plurality of underground cable shielding plates 100 may be further provided with a shielding plate bending connector 60 for connecting the underground cable shielding plates 100 with each other when the directions are different from each other.

The bending connector 60 is provided with a plurality of underground cable protection plates installed in the ground. The bending connection pin 61 for the underground cable protection plate connects the plurality of underground cable protection plates to one side, And a bending connection body 62 having curved connection surfaces formed on both sides thereof.

Thus, the underground cable protection plates connected to both sides of the flexure connecting body 62 are formed in different directions.

A bending lower fixing blade (63) is formed on the lower surface of the bending connection body (62) so that the connection to the ground surface is firm.

Also, on the upper surface of the bending connection body 62 corresponding to the bending lower fixing blade 63, a bending upper water flow bore 64 is formed to allow water to flow along the bending upper water flow bore 64. When a plurality of shroud bending connectors 60 are stacked, the bending lower fixing wings of the upper shroud bending joints are fitted to the bending upper water flow bumps 64 and the stacked state can be stably maintained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The technical idea of the present invention should not be construed as being limited.

100: underground cable shield plate 10: plate
20: Shape retaining hole 30: Lower fixed blade
40: Upper water flow
50: shroud connector 60: shroud bend connector
70: Shielding plate manufacturing apparatus

Claims (5)

A plurality of underground cable shield plates 100 installed in the ground;
A plurality of ground cable protection plates 100 installed in the ground are installed in a plurality of the ground cable protection plates 100, and a plurality of underground cable protection plates are connected to the underground cable protection plate protection plate connection port 50, As a result,
The shield plate connector 50 is inserted into the shape retaining holes 20 formed on one side of the plate 10 of the underground cable shield plates,
The shield plate connector (50)
A connecting port outer surface 51 inserted into the shape retaining hole 20 formed at one side of the plate 10 of the underground cable protecting plates and abutting against the wall surface of the shape retaining hole 20; And
And a connector through hole (52) penetrating in the longitudinal direction inside,
And a shield plate flexure connector 60 connected in a curved shape so as to connect underground cable shield plates 100 installed in different directions when the plurality of underground cable shield plates 100 are installed in mutually different directions, The cable shielding plates 100 are formed in a straight line shape,
The shield plate bending connector (60)
A plurality of underground cable shielding plates installed in the ground are provided in a plurality of mutually connected to each other, and a bending connection pin 61 for an underground cable shielding plate for connecting a plurality of underground cable shielding plates is provided on one side,
And a bending connection body (62) having a bending connection pin (61) formed on one side or both sides and having a curved surface as a whole body shape,
And the underground cable protection plates connected to both sides of the bending connection body (62) are formed in different directions from each other.
delete The method according to claim 1,
A connector fixing protrusion 53, which is a plurality of protrusions protruding outward, is formed on the connector outer surface 51,
The connecting plate fixing protrusion 53 is pressed against the inner wall surface of the shape retaining through hole 20 in a state where the protecting plate connecting hole is inserted into the shape retaining hole 20, To prevent escape,
The underground cable shield plate (100)
A plate 10 in the form of a large-area flat plate;
A lower fixing blade 30 protruding in the longitudinal direction in the longitudinal direction at the lower surface of the plate 10 to prevent rocking in the ground; And
And an upper water flow valley (40) forming a longitudinally long groove in the upper surface of the plate (10)
The upper water flow valley 40 is formed at a position corresponding to the lower fixed vane 30,
The lower stationary vane 30 includes lower airbag protrusions 31 and 31 'projecting laterally from the lower stationary vane 30,
The lower air releasing projections 31 and 31 '
A circular lowering protrusion formed by a protrusion protruding sideways in a shape of a lower side of the lower fixing vane 30, or
And a triangular projection-like lowering protrusion made of a protrusion protruding laterally in a triangular shape under the lower fixing vane (30).
delete The method according to claim 1,
A bending lower fixing blade (63) is formed on a lower surface of the bending connection body (62)
And a bending upper water flow valley (64) is formed on the upper surface of the bending connection body (62) corresponding to the bending lower fixing vane (63).
KR1020160006495A 2016-01-19 2016-01-19 Protection joint for protection plate of underground cable KR101653403B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220170556A (en) * 2021-06-23 2022-12-30 한국전력공사 Protection plate of underground electric cable

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100473328B1 (en) 2001-10-05 2005-03-07 한보니스코 주식회사 Protect plate for subterranean line
KR200411615Y1 (en) 2005-12-21 2006-03-16 제룡산업 주식회사 Protect plate of transmission and distribution electricity line layed in underground
KR100960615B1 (en) * 2010-03-31 2010-06-07 대성네트웍 주식회사 Device for protecting the communication line
KR20140057952A (en) * 2012-11-05 2014-05-14 김경태 Fixing apparatus for protection panel of underground product

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100473328B1 (en) 2001-10-05 2005-03-07 한보니스코 주식회사 Protect plate for subterranean line
KR200411615Y1 (en) 2005-12-21 2006-03-16 제룡산업 주식회사 Protect plate of transmission and distribution electricity line layed in underground
KR100960615B1 (en) * 2010-03-31 2010-06-07 대성네트웍 주식회사 Device for protecting the communication line
KR20140057952A (en) * 2012-11-05 2014-05-14 김경태 Fixing apparatus for protection panel of underground product

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220170556A (en) * 2021-06-23 2022-12-30 한국전력공사 Protection plate of underground electric cable
KR102507330B1 (en) * 2021-06-23 2023-03-08 한국전력공사 Protection plate of underground electric cable

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