Protective device for underground cable

Abstract

The embodiment of the invention relates to the field of communication, and provides an underground cable protection device, which comprises an underground cable and a protection part, and is characterized in that the protection part is located at one side, close to the ground surface, of the underground cable; the protection part comprises N conductive wires which are arranged in parallel along a first direction, wherein N is greater than or equal to 2; the extension direction of the conductive wire is parallel to the extension direction of the underground cable; two ends of the conductive connecting piece are respectively arranged between the adjacent conductive wires and are electrically connected with the conductive wires; and a net-shaped structure is formed between the conductive wire and the conductive connecting piece. The protection device of the underground cable provided by the embodiment of the invention at least can protect the safety of a communication line, and also can isolate various discrete currents.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and in particular to a protective device for underground cables. Background Art

[0002] For countries with undulating terrain, long-distance communication lines need to cross mountains and ridges in many sections, and adopt overhead routing. Although the construction is relatively simple, there are also great hidden dangers in its safety. Especially in areas where lightning strikes frequently, such as mountains, jungles and plateaus, communication failures caused by electrical damage are the main factor in regional communication accidents. Usually, most of these areas will adopt underground direct burial for construction. Compared with overhead optical cable protection, direct burial has great advantages. The conductive properties of metal materials in communication lines can easily become lightning strike carriers in areas with frequent lightning.

[0003] At present, the conventional ways to deal with strong currents in most areas are: 1) using non-metallic communication optical cables made of quartz and other materials; 2) using non-metallic pipe isolation methods; 3) using current diversion plate protection methods; 4) using metal electromagnetic shielding layer pipes; however, the construction costs of these prevention methods are relatively high and the construction difficulty is high, which is not conducive to specific implementation.

[0004] Therefore, how to design a method and structure that is low in cost and easy to construct and can be helpful in handling high currents is a technical problem that those skilled in the art need to solve. Summary of the invention

[0005] The embodiment of the present application provides a protective device for underground cables, which at least helps to solve the problems of burning and corrosion of underground cables during thunderstorms and rainy seasons.

[0006] According to some embodiments of the present application, on the one hand, the embodiments of the present application provide a protective device for underground cables, comprising: an underground cable and a protective member, wherein the protective member is located on a side of the underground cable close to the ground surface; the protective member comprises: N conductive wires arranged in parallel along a first direction, wherein N ≥ 2; an extension direction of the conductive wires is parallel to an extension direction of the underground cable; a conductive connecting member, wherein both ends of the conductive connecting member are respectively spanned between adjacent conductive wires and electrically connected to the conductive wires; and a mesh structure is formed between the conductive wires and the conductive connecting member.

[0007] In some embodiments, the distance S between the conductive wire and the underground cable ranges from 40 cm to 120 cm.

[0008] In some embodiments, N≥3, and the distance between the conductive line located in the middle and the ground surface is the smallest.

[0009] In some embodiments, the conductive wires include a first type of conductive wires and a second type of conductive wires, the first type of conductive wires are located above the underground cables, the second type of conductive wires are located to the side of the underground cables, and the distance S1 between the first type of conductive wires and the underground cables ranges from 40 cm to 120 cm.

[0010] In some embodiments, the second type of conductive wire is located above and to the side of the underground cable, and a vertical distance S2 between the second type of conductive wire and the underground cable is less than or equal to a distance S1 between the first type of conductive wire and the underground cable.

[0011] In some embodiments, the end of the conductive connector is wrapped around the outside of the conductive wire, or the end of the conductive connector has a clamping structure, and the clamping structure is used to clamp the conductive wire.

[0012] In some embodiments, it further includes: a line junction box, which is located at the connection between two underground cables extending along the second direction; and a grounding device, which is connected to the grounding wire in the line junction box.

[0013] In some embodiments, the grounding device is also electrically connected to the conductive line.

[0014] In some embodiments, the distance L1 between adjacent conductive lines ranges from 10 cm to 50 cm.

[0015] In some embodiments, the spacing L2 of the conductive connectors is less than or equal to 200 cm.

[0016] The technical solution provided by the embodiment of the present application has at least the following advantages:

[0017] The protective device for underground cables provided in the embodiment of the present application provides a protective member, which includes a conductive wire and a conductive connector. The conductive wire and the conductive connector form a mesh structure to provide all-round protection for the communication lines. The mesh structure formed by the protective lines has excellent tensile and compressive properties. The force of each section is transmitted through the conductive connector and will be spread to all lines to bear together. This time, the physical principle of parallel circuits is used to quickly reduce the voltage and current on the unit circuit, and the strong current is introduced into the ground through the metal drainage route. It protects the safety of the communication lines and can also isolate various types of discrete currents, thereby playing a great role in the electrical protection of underground communication equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily illustrated by the figures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Unless otherwise specified, the figures in the drawings do not constitute a scale limitation. In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic cross-sectional structure diagram of a protective device for underground cables provided in one embodiment of the present application;

[0020] Figure 2 Another schematic cross-sectional structure diagram of a protective device for underground cables provided in one embodiment of the present application;

[0021] Figure 3 A top view of a protective device for underground cables provided in one embodiment of the present application;

[0022] Figure 4 Another top view of a protective device for underground cables provided in one embodiment of the present application. DETAILED DESCRIPTION

[0023] As can be seen from the background technology, current underground cables are prone to burnout and corrosion during thunderstorms and rainy seasons.

[0024] Analysis found that one of the reasons why underground cables are prone to burning and corrosion during thunderstorms is that although the earth itself is an insulator, when current is introduced into the earth, some discrete current phenomena will be generated due to the energy of impurities such as moisture and metal in the soil, forming an electric field effect within a certain range. The electric field caused by this stray current is the discrete current flowing outside the given circuit loop. When these stray currents flow into the metal components of the buried communication line, and then flow out of the metal body and are introduced into conductive materials such as the earth or water, due to the anode phenomenon formed at the current outflow site, a fierce corrosion reaction will occur at the current outflow site. This is usually called discrete electrical corrosion. Discrete electrical corrosion is one of the biggest hazards of buried communication lines. It not only affects the service life of buried communication equipment, but also affects the transmission quality of communication signals conducted inside the line. It is more likely to cause a series of communication accidents due to current interference and electrical breakdown short circuit.

[0025] An embodiment of the present application provides a protective device for underground cables. Before a strong current enters the communication equipment, a mesh structure composed of conductive wires and conductive connectors in the protective member is adopted. The conductive wires and conductive connectors in the protective member are made of conventional materials, not special preparation materials, and therefore are inexpensive and easy to prepare.

[0026] The mesh structure composed of conductive wires and conductive connectors in the protective part is located above the underground cable. When lightning is transmitted from the ground surface to the underground cable, it needs to pass through the conductive wires and conductive connectors. Because of the protection characteristics of the parallel current of the mesh structure, it also has a strong ability to prevent various problems caused by discrete current. This low-cost protection method can effectively solve various current protection problems of underground communication lines. It can eliminate most discrete electrical corrosion reactions, greatly improve the service life of underground communication equipment, and reduce subsequent maintenance costs and work intensity.

[0027] The mesh structure composed of conductive wires and conductive connectors in the protective element will form a stable high-current protection network area on the upper part of the communication trunk line, which can almost cope with all electrical damage. The solid stability of the metal connecting components makes the formed mesh protective layer also have a strong protective function against physical impact and puncture damage. The mesh metal protective layer has a strong resistance to natural disasters such as floods, mudslides, and rock falls. The mesh structure can evenly distribute the damage to each section of the protective layer.

[0028] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0031] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0032] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0034] In the drawings corresponding to the embodiments of the present application, the thickness and area of ​​the layers are exaggerated for better understanding and ease of description. When describing a component (such as a layer, film, region or substrate) on another component or on the surface of another component, the component may be "directly" located on the surface of the other component, or a third component may be present between the two components. On the contrary, when describing a component on the surface of another component or when another component is formed or provided on the surface of a component, it means that there is no third component between the two components. In addition, when describing a component as being "substantially" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0035] In the description of the embodiments of the present application, when a component "includes" another component, unless otherwise specified, other components are not excluded, and other components may be further included. In addition, when a component such as a layer, film, region, or plate is referred to as being "on / located on" another component, it may be "directly on" the other component (i.e., located on the surface of the other component with no other components between them), or another component may exist in between. In addition, when a component such as a layer, film, region, or plate is "directly located on" another component, or when a component such as a layer, film, region, or plate is located on the surface of another component, it means that no other components are located in between.

[0036] The terms used in the description of the various embodiments described herein are only used to describe specific embodiments and are not intended to be limiting. As used in the description of the various embodiments described and in the appended claims, "the part" is also intended to include the plural form unless the context clearly indicates otherwise. Among them, a component includes a layer, a film, a region, or a plate.

[0037] The following will describe the various embodiments of the present application in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present application, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed in the present application can be implemented.

[0038] Figure 1 A schematic cross-sectional structure diagram of a protective device for underground cables provided in one embodiment of the present application; Figure 2 Another schematic cross-sectional structure diagram of a protective device for underground cables provided in one embodiment of the present application; Figure 3 A top view of a protective device for underground cables provided in one embodiment of the present application; Figure 4 Another top view of a protective device for underground cables provided in one embodiment of the present application.

[0039] refer to Figure 1 and Figure 3 According to some embodiments of the present application, on the one hand, the embodiments of the present application provide a protective device for an underground cable 10, comprising: an underground cable 10 and a protective member, the protective member being located on a side of the underground cable 10 close to the ground surface; the protective member comprising: N conductive wires 110 arranged in parallel along a first direction, N ≥ 2; the extension direction of the conductive wires 110 is parallel to the extension direction of the underground cable 10; a conductive connector 120, the two ends of the conductive connector 120 are respectively arranged between adjacent conductive wires 110 and electrically connected to the conductive wires 110; and a mesh structure is formed between the conductive wires 110 and the conductive connector 120.

[0040] The underground cable 10 provided in the embodiment of the present application can be any cable for communication current, such as power cable, control cable, compensation cable, shielded cable, high temperature cable, computer cable, signal cable, marine cable, etc.

[0041] In some embodiments, the protective element is located on the side of the underground cable 10 close to the ground surface. When lightning is transmitted from the ground surface to the underground cable 10, it needs to pass through the conductive wire 110 and the conductive connector 120. Because of the protection characteristics of the parallel current of the mesh structure, it also has a strong ability to prevent various problems caused by discrete current. This low-cost protection method can effectively solve various current protection problems of underground communication lines. It can eliminate most discrete electrical corrosion reactions, greatly improve the service life of underground communication equipment, and reduce subsequent maintenance costs and work intensity.

[0042] In some embodiments, there is no qualitative requirement for the number of conductive wires 110, and the number can be increased or decreased according to actual needs and cost considerations. As for the specific material, various types of conductive metal materials can be selected according to actual needs, that is, more expensive materials such as copper with excellent conductivity can be selected, or cheaper materials such as iron and aluminum can be selected. The laying method can be adjusted accordingly according to the actual terrain and altitude.

[0043] In some embodiments, the distance S between the conductive wire 110 and the underground cable 10 is in the range of 40 cm to 120 cm. In this way, the conductive wire 110 and the underground cable 10 may not affect each other or have little mutual influence, and the influence of current arc or parasitic capacitance on each other can be effectively avoided, thereby causing adverse effects on the signals transmitted by the communication.

[0044] In some embodiments, the distance S between the conductive wire 110 and the underground cable 10 may be 40 cm, 48 cm, 56 cm, 69 cm, 84 cm, or 112 cm.

[0045] In some embodiments, N≥3, the distance between the conductive wire 110 in the middle and the ground surface is the shortest, that is, the distance between the conductive wire 110 in the middle and the underground cable 10 is the farthest. The protective element formed in this way presents a structure with a high middle and low sides. This structure with a high middle and low sides can have good current resistance.

[0046] The structure with high in the middle and low on both sides can also form a stable triangle. This triangular structure can make the protection device more stable and effectively prevent the communication trunk line from being torn and broken due to the physical pulling force of muddy water, which may cause communication accidents. The stable structure can also greatly prevent the loss of soil below, thereby protecting the communication trunk line below.

[0047] The triangular structure can also shorten the horizontal dimension of the groove for accommodating the underground cable 10, thereby reducing the difficulty and cost of forming the groove; in addition, the structure can be set in a hilly area, thereby improving the application scenario of the structure.

[0048] In some embodiments, the spacing L1 between adjacent conductive wires 110 ranges from 10 cm to 50 cm. The spacing between the conductive wires 110 is to ensure that the parasitic capacitance and current arc between adjacent conductive wires 110 are less affected; secondly, to ensure that there are more diversion channels for diverting current, thereby providing higher protection for the underground cable 10; thirdly, the preparation cost and difficulty of the conductive wire 110 can be lowered under the premise of having higher protection in an effective preparation space.

[0049] In some embodiments, the distance L1 between adjacent conductive lines 110 may be 10 cm, 12 cm, 22 cm, 38 cm, 44 cm, or 50 cm.

[0050] It should be noted that the above-mentioned spacing L1 between adjacent conductive lines 110 and the spacing L2 between adjacent conductive connectors 120 mentioned below are examples. Those skilled in the art can set the spacing L1 between adjacent conductive lines 110 and the spacing L2 between adjacent conductive connectors 120 mentioned below according to actual needs.

[0051] In some embodiments, the conductive wire 110 includes a first type of conductive wire 111 and a second type of conductive wire 112, the first type of conductive wire 111 is located above the underground cable 10, the second type of conductive wire 112 is located on the side of the underground cable 10, and the distance S1 between the first type of conductive wire 111 and the underground cable 10 ranges from 40cm to 120cm. In this way, in slopes such as hills and other slopes, the metal mesh composed of metal protective lines can be used to dig auxiliary ditches to achieve better protection efficiency, that is, it is not limited to plain areas, and can be actually designed in combination with the topographical characteristics of the laying area to achieve better protection effects and functions for the underground cable 10, thereby improving the application scenarios and practicality of the protective structure of the underground cable 10 provided in the embodiment of the present application.

[0052] In some embodiments, the first type of conductive wire 111 and the underground cable 10 are located in the first trench 101 , and the second type of conductive wire 112 is located in the second trench 102 .

[0053] In some embodiments, the second type conductive wire 112 is located above and to the side of the underground cable 10 , and a vertical distance S2 between the second type conductive wire 112 and the underground cable 10 is less than or equal to a distance S1 between the first type conductive wire 111 and the underground cable 10 .

[0054] In some embodiments, a distance S2 between the second type conductive wire 112 and the underground cable 10 along the vertical direction is greater than a distance S1 between the first type conductive wire 111 and the underground cable 10 .

[0055] In the above two situations, the second type of conductive wire 112 can be combined with relevant situations to form different positions of the underground cable 10. That is to say, the second type of conductive wire 112 can be actually designed according to the topographical characteristics of the laying area to achieve better protection effect and function for the underground cable 10.

[0056] In some embodiments, the conductive wires 110 are connected by metal connecting members, so that each protective metal wire forms a metal wiring mesh structure with a relatively stable spacing. The structural firmness of the metal connecting member and the tensile and compressive resistance of the mesh structure formed by the protective line are excellent. The force of each section is transmitted through the connecting member and will be spread to all lines to bear together. Unless the instantaneous force is greater than N sections (N is the number of metal wires laid in the route), it is difficult to break through the mesh protection layer and damage the communication trunk line protected deeper. The metal wiring mesh structure also has a certain protective effect against the impact damage of water flow. The impact damage to the field directly buried communication trunk line is mainly caused by mountain torrents, landslides, mudslides and other damages caused by heavy rain. These disasters are mainly caused by the impact of a large amount of soil, which causes the communication trunk line buried deep to be exposed to the physical tension of the muddy water, causing the communication trunk line to be torn and broken, causing communication accidents. The metal mesh protection structure causes the tensile strength of the metal wire and the tension of the mesh structure to share, which can basically withstand most of the impact damage. The characteristics of the mesh protection structure can greatly prevent the loss of soil below, thereby protecting the communication trunk lines below.

[0057] In some embodiments, there is no qualitative requirement for the number of conductive connectors 120, and they can be increased or decreased according to actual needs and cost considerations. For specific materials, various types of conductive metal materials can be selected according to actual needs, that is, more expensive materials such as copper with excellent conductivity can be selected, or cheaper materials such as iron and aluminum can be selected. The laying method can be adjusted accordingly according to the actual terrain and altitude.

[0058] In some embodiments, the end of the conductive connector 120 is wrapped around the outside of the conductive wire 110 .

[0059] In some embodiments, the end of the conductive connector 120 has a snap-fit ​​structure, and the snap-fit ​​structure is used to snap the conductive wire 110 .

[0060] In some embodiments, the spacing L2 between adjacent conductive connectors 120 is less than or equal to 200 cm. This spacing range is to shorten the distance between the branches of the current diversion, so that the current can be quickly diverted through the conductive connector 120 to avoid the problem of accumulation on a conductive line 110 causing burning and local overheating.

[0061] In addition, this spacing range can make the stability between the conductive wire 110 and the conductive connector 120 higher, and thus can effectively avoid the communication accidents caused by the physical tension of the impact caused by mountain torrents, landslides, mudslides and other damages caused by heavy rain, which may cause the communication trunk line to be torn and broken. In other words, the metal mesh protection structure formed by this spacing can improve the tensile strength of the metal wire and the tension sharing of the mesh structure, and can basically withstand most of the impact damage. The characteristics of the mesh protection structure can also greatly protect the loss of soil below, thereby protecting the communication trunk line below.

[0062] In some embodiments, the distance L2 between adjacent conductive connectors 120 may be 10 cm, 22 cm, 50 cm, 88 cm, 144 cm, or 186 cm.

[0063] In some embodiments, reference Figure 4 , further comprising: a line junction box 103, the line junction box 103 being located at the connection of two underground cables 10 extending along the second direction; a grounding device, the grounding device being connected to the grounding wire in the line junction box.

[0064] In some embodiments, the grounding device is also electrically connected to the conductive line 110. Through the grounding protection device at each joint point, the segmented double grounding mode completes the strong current protection of the communication line to prevent the current backflow phenomenon caused by excessive current and voltage from damaging the communication line.

[0065] An embodiment of the present application provides a protective device for an underground cable 10. Before a strong current enters the communication equipment, a mesh structure composed of a conductive wire 110 and a conductive connector 120 in the protective member is adopted. The conductive wire 110 and the conductive connector 120 in the protective member are both conventional materials, not special preparation materials, and therefore are inexpensive and easy to prepare.

[0066] The mesh structure composed of the conductive wire 110 and the conductive connector 120 in the protective member is located above the underground cable 10. When lightning is transmitted from the ground surface to the underground cable 10, it needs to pass through the conductive wire 110 and the conductive connector 120. Because of the protection characteristics of the parallel current of the mesh structure, it also has a strong ability to prevent various problems caused by discrete current. This low-cost protection method efficiently solves various current protection problems of underground communication lines. It can eliminate most discrete electrical corrosion reactions, greatly improve the service life of underground communication equipment, and reduce subsequent maintenance costs and work intensity.

[0067] The mesh structure composed of the conductive wire 110 and the conductive connector 120 in the protective member will form a stable strong current protection network area on the upper part of the communication trunk line, which can almost cope with all electrical damage. The solid stability of the metal connecting components makes the formed mesh protective layer also have a strong protective function against physical impact and puncture damage. The mesh metal protective layer has a strong resistance to natural disasters such as floods, mudslides, and rock falls. The mesh structure can evenly distribute the damage to each section of the protective layer.

[0068] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present application, and in practical applications, various changes may be made to the embodiments in form and detail without departing from the spirit and scope of the present application. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present application, and therefore the scope of protection of the present application shall be subject to the scope defined in the claims.

Claims

1. A protective device for underground cables, characterized in that: include: An underground cable and a protective member, wherein the protective member is located on a side of the underground cable close to the ground surface; The protective element comprises: N conductive wires arranged in parallel along a first direction, wherein N≥2; the extending direction of the conductive wires is parallel to the extending direction of the underground cable; A conductive connecting member, two ends of which are respectively arranged between adjacent conductive wires and electrically connected to the conductive wires; and a mesh structure is formed between the conductive wires and the conductive connecting member.

2. The underground cable protection device according to claim 1, characterized in that: The distance S between the conductive wire and the underground cable ranges from 40 cm to 120 cm.

3. The underground cable protection device according to claim 1 or 2, characterized in that: When N≥3, the distance between the conductive wire in the middle and the ground surface is the smallest.

4. The underground cable protection device according to claim 1 or 2, characterized in that: The conductive wires include first-type conductive wires and second-type conductive wires. The first-type conductive wires are located above the underground cable, and the second-type conductive wires are located on the side of the underground cable. The distance S1 between the first-type conductive wires and the underground cable is in the range of 40 cm to 120 cm.

5. The underground cable protection device according to claim 4, characterized in that: The second type of conductive wire is located above and to the side of the underground cable, and a distance S2 between the second type of conductive wire and the underground cable in a vertical direction is less than or equal to a distance S1 between the first type of conductive wire and the underground cable.

6. The underground cable protection device according to claim 1, characterized in that: The end of the conductive connecting member is wound around the outside of the conductive wire, or the end of the conductive connecting member has a clamping structure, and the clamping structure is used to clamp the conductive wire.

7. The underground cable protection device according to claim 1, characterized in that: Also includes: A line junction box, the line junction box is located at the connection of two underground cables extending along the second direction; A grounding device is connected to the grounding wire in the line junction box.

8. The underground cable protection device according to claim 7, characterized in that: The grounding device is also electrically connected to the conductive wire.

9. The underground cable protection device according to claim 1, characterized in that: The distance L1 between adjacent conductive lines ranges from 10 cm to 50 cm.

10. The underground cable protection device according to claim 1, characterized in that: The distance L2 between the conductive connecting members is less than or equal to 200 cm.

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