KR102436606B1 - Conductive shielding and cooling system for power cable - Google Patents

Abstract

The present invention relates to a conductive shielding cooling system for power cables. Conductive shielding cooling system for power cables according to the present invention is provided adjacent to the intermediate connection portion and the intermediate connection portion for connecting a plurality of power cables to each other, the conductive member through which the induced current induced by the current flowing along the conductor of the power cable flows and at least one conductive cooling pipe having a cooling unit through which a cooling fluid for cooling the conductive member flows.

Description

Conductive shielding and cooling system for power cable

The present invention relates to a conductive shielding cooling system for power cables.

As the industry develops in recent years, technologies related to cables for transmitting power and/or electrical signals to various devices have also been developed. The cable has a conductor made of copper or aluminum therein to transmit power or electrical signals.

However, when a current flows along a conductor provided inside the cable, an electromagnetic wave (EMF) or an electromagnetic field (hereinafter, referred to as an 'electromagnetic wave') is generated outside the conductor. The electromagnetic wave has components of an electric field and a magnetic field, and when a periodic current, ie, an alternating current, flows in a predetermined circuit, the magnetic field and the electric field are generated while alternately propagating. Since these electromagnetic waves may have a harmful effect on the human body, etc., it is important to shield electromagnetic waves, particularly magnetic fields, when alternating current flows along the conductor of the cable.

In particular, in the case of burying the power cable underground, since the power cable is buried at a relatively shallow depth of several meters underground, the intensity of the electromagnetic wave on the ground compared to overhead lines installed at a height of several tens of meters or more above the ground is relatively high.

As a technology for shielding such electromagnetic waves, there is a method of embedding a metal plate such as aluminum or copper in the upper portion of the power cable and shielding it by an eddy current or the like. Although this method can effectively reduce electromagnetic waves generated from the power cable, it takes a lot of time and money to embed the metal plate, and furthermore, there is a problem in that the metal plate is corroded over time, making maintenance difficult.

The second technique is to provide a ferromagnetic tape (Ferromagnetic Shielding tape) inside the power cable to shield the electromagnetic wave from the power cable itself. However, in the second method, since the ferromagnetic tape is included inside the power cable itself, the internal configuration of the power cable is complicated, and furthermore, the problem that the power cable standard according to each country or customer request may not be suitable. There is this.

In the third and final technique, an additional cable is installed adjacent to the power cable to form a so-called 'passive loop', and an induced current flowing in the opposite direction is induced by the current flowing through the conductor of the power cable. A method of shielding electromagnetic waves. Although the third method can reduce the electromagnetic wave without changing the configuration of the power cable, the temperature of the power cable may be increased by the additional cable, and accordingly, there is a problem in that the current capacity flowing along the power cable is reduced.

An object of the present invention is to prevent a decrease in the current capacity due to an increase in the temperature of the power cable when the electromagnetic wave is reduced by the passive loop method in order to solve the above problems.

An object of the present invention as described above is an intermediate connection portion for connecting a plurality of power cables to each other and a conductive member provided adjacent to the intermediate connection portion through which an induced current induced by a current flowing along a conductor of the power cable flows; This is achieved by a conductive shielding cooling system for a power cable having at least one conductive cooling pipe having a cooling section through which a cooling fluid for cooling the member flows.

Here, the conductive cooling pipe includes an outer pipe member provided adjacent to the intermediate connection portion, and the conductive member provided inside the outer pipe member and through which an induced current induced by a current flowing along a conductor of the power cable flows. do.

Meanwhile, the cooling unit includes an inner pipe member provided inside the conductive member and the cooling fluid flowing along the inside of the inner pipe member.

Here, the conductive cooling pipe is provided to constitute a closed loop, and the conductive shielding cooling system for the power cable further includes a circulation unit for circulating the cooling fluid along the conductive cooling pipe.

Furthermore, the conductive cooling pipe may further include a protective layer for preventing corrosion.

On the other hand, the object of the present invention as described above is a power cable having at least one conductor through which a current flows, and a conductive member provided adjacent to the power cable through which an induced current induced by a current flowing along the conductor of the power cable flows. and at least one conductive cooling pipe having a cooling section through which a cooling fluid for cooling the conductive member flows.

Here, the conductive cooling pipe includes an outer pipe member provided adjacent to the power cable and the conductive member provided inside the outer pipe member and through which an induced current induced by a current flowing along a conductor of the power cable flows. do.

Meanwhile, the cooling unit includes an inner pipe member provided inside the conductive member and the cooling fluid flowing along the inside of the inner pipe member.

Further, the conductive cooling pipe is provided to constitute a closed loop, and the conductive shielding cooling system for the power cable further includes a circulation unit for circulating the cooling fluid along the conductive cooling pipe.

In addition, the conductive cooling pipe may further include a protective layer for preventing corrosion.

According to the present invention having the above configuration, when the electromagnetic wave is reduced by the passive loop method, the temperature rise of the power cable is suppressed by a cooling unit for cooling the power cable to prevent a decrease in the current capacity. can

1 is a cross-sectional view showing a cross-section of a power cable according to an embodiment;
2 is a view showing an intermediate connection connecting the power cables to each other;
3 is a view showing the arrangement of the power cable at 'A' and 'B' in FIG. 2;
Figure 4 is a view in which the conductive member is arranged in Figure 3 (A);
Figure 5 is a view of the arrangement of the conductive member in Figure 3 (B),
6 to 8 are views measuring the intensity of electromagnetic waves in the arrangement according to FIGS. 3 to 5;
9 is a plan view showing the configuration of a conductive shielding cooling system for a power cable according to an embodiment of the present invention;
10 to 13 are views showing the arrangement of the power cable and the conductive cooling pipe in the conductive shielding cooling system for the power cable;
14 is a plan view showing the configuration of a conductive shielding cooling system for a power cable according to another embodiment of the present invention.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the drawings. First, we will look at the configuration of the power cable 100, and then look at the configuration of the conductive shielding cooling system for the power cable for shielding electromagnetic waves.

1 is a cross-sectional view illustrating an internal configuration of a power cable 100 according to an embodiment.

Referring to FIG. 1 , the power cable 100 includes a conductor 131 along the center thereof. The conductor 131 serves as a passage through which current flows, and is made of, for example, copper or aluminum. The conductor 131 is configured by winding a plurality of strands.

However, since the surface of the conductor 131 is not smooth, an electric field may be non-uniform or an electric field concentration may occur, and partial corona discharge may easily occur. In addition, when a void is formed between the surface of the conductor 131 and the insulating layer 132 to be described later, the insulating performance is deteriorated. To solve the above problems, the outside of the conductor 131 is wrapped with a semiconducting material such as semiconducting carbon paper, and a layer formed of the semiconducting material is defined as the inner semiconducting layer 133 .

As a result, the inner semiconducting layer 133 prevents partial discharge caused by the relaxation of the electric field on the surface of the conductor 131 and the void between the conductor 131 and the insulating layer 132 . In addition, the inner semiconducting layer 133 maintains an ideal concentric cylindrical electrode shape in the cable to smooth the surface of the conductor 131 to relieve electric field concentration, and to bring the conductor 131 and the insulating layer 132 into close contact with each other. Corona discharge that may occur on the surface of the conductor 131 may be prevented.

Meanwhile, an insulating layer 132 is provided outside the inner semiconducting layer 133 . The insulating layer 132 electrically insulates the conductor 131 from the outside. In general, the insulating layer 132 has a high breakdown voltage, and insulating performance must be stably maintained for a long period of time. Furthermore, it should have low dielectric loss and resistance to heat such as heat resistance. Accordingly, the insulating layer 132 is manufactured using, for example, cross-linked polyethylene (XLPE) or the like as a raw material.

However, if the outside as well as the inside of the insulating layer 132 is not shielded, a portion of the electric field is absorbed into the insulating layer 132 , but most of the electric field is discharged to the outside. In this case, when the electric field becomes larger than a predetermined value, the insulating layer 132 and the outer sheath of the power cable 100 may be damaged by the electric field. Accordingly, a semiconducting layer is provided outside the insulating layer 132 again, and is defined as the outer semiconducting layer 134 in order to distinguish it from the aforementioned inner semiconducting layer 133 . The outer semiconducting layer 134 serves to protect the insulating layer 132 by suppressing the electric field inequality caused by the deviation of the insulating thickness, and makes the distribution of the electric field lines between the inner semiconducting layer 133 and the above-described inner semiconducting layer 133 into an equipotential, thereby making the insulating layer (132) serves to improve the dielectric strength.

A metal sheath 135 or a neutral wire (not shown) is provided outside the outer semiconducting layer 134 depending on the type of cable. The metal sheath 135 or the neutral wire (not shown) is provided for electrical shielding and return of the short-circuit current.

The outermost shell 136 of the power cable 100 is provided. The outer shell 136 is provided at the outermost portion of the power cable 100 to serve to protect the internal configuration of the power cable 100 . Accordingly, the outer shell 136 has excellent properties such as weather resistance that can withstand natural environments including various climates such as light, wind and rain, moisture and gases in the air, chemical resistance and mechanical strength to withstand chemicals such as chemicals. In general, PVC (Polyvinyl chloride; polyvinyl chloride) or PE (Polyethylene: polyethylene) as a material is used to manufacture the outer skin.

However, when a current flows along the conductor 131 provided inside the power cable 100, an electromagnetic wave (EMF: ElectroMagnetic File) or an electromagnetic field (hereinafter referred to as 'electromagnetic wave') is generated to the outside of the conductor 131 . will do The electromagnetic wave has two components of an electric field and a magnetic field, and when a periodic current, ie, an alternating current, flows in a predetermined circuit, the magnetic field and the electric field are generated while alternately propagating.

Here, when the human body is exposed to an electric field, a surface charge that fluctuates with the same frequency is induced, thereby causing a current to flow inside the human body. looks like In addition, when the human body is exposed to a magnetic field, an electric field and an eddy current are induced inside, and this current increases according to the frequency and the magnitude of the magnetic flux density. In the case of power cables, most of the electric field is shielded by the metal sheath and the frequency is low, so it is not a big problem, but the shielding effect of the metal sheath is low for the magnetic field, and the magnetic field caused by the conductor current is Since it is exposed to the outside as it is, it is very harmful to the human body. Therefore, it is important to shield electromagnetic waves, particularly magnetic fields, when an alternating current or the like flows along the conductor 131 of the power cable 100 . Hereinafter, it is possible to shield electromagnetic waves, particularly magnetic fields, generated from the current flowing along the conductor 131 of the power cable 100 , and furthermore, conductive shielding for a power cable capable of preventing a decrease in the current capacity of the conductor 131 . Let's take a look at the cooling system.

First, a so-called 'passive loop' method among the electromagnetic wave shielding methods described above will be described.

2 shows an intermediate connection part 200 for connecting a pair of power cable assemblies 1000A and 1000B to each other. Here, the power cable assembly 1000A means that a plurality of the aforementioned power cables 100 are configured and provided in the form of one assembly. For example, in the case of a three-phase line, it is also possible to include three conductors in one cable, and it is also possible to configure a three-phase line by providing three power cables as described below.

At this time, the arrangement of the power cable 100 in the power cable assembly 1000A is shown in FIG. 3 . 3 is a view showing the arrangement of the power cable at 'A' and 'B' in FIG. 2 .

Referring to FIG. 3 , in the power cable assembly 1000 , the power cables 100A, 100B, and 100C are assembled with each other and arranged in a triangular shape as shown in FIG. 3A , and in the intermediate connection unit 200 The power cables 100A, 100B, and 100C may be disposed to be spaced apart from each other by a predetermined distance for connection.

When the 'passive loop' method is applied in the state shown in FIG. 3 , a conductive member may be disposed adjacent to the power cables 100A, 100B, and 100C.

4 and 5 are additional conductive members 1100, 1200, and 1300 by the 'passive loop' method in the intermediate connection part 200 in the state of FIGS. 3A and 3B, respectively. It shows a configuration with

Referring to FIG. 4(A), the conductive members 1100, 1200, and 1300 are provided on one side of the power cables 100A, 100B, and 100C, respectively, and referring to FIG. 5, the conductive members 1100A, 1100B, 1200A , 1200B, 1300A, and 1300B) are provided in pairs at the upper and lower portions of the power cables 100A, 100B, and 100C, respectively.

Meanwhile, the diameters of the conductive members 1100 , 1200 , and 1300 may be determined according to the magnitude of the magnetic field leaked from the power cables 100A, 100B, and 100C. For example, in the case of FIG. 4(A), the conductive members 1100, 1200, and 1300 have a diameter approximately similar to the diameter of each of the conductors 131A, 131B, and 131C of the power cables 100A, 100B, and 100C. 5, the conductive members 1100A, 1100B, 1200A, 1200B, 1300A, and 1300B are connected to the diameter of each conductor 131A, 131B, 131C of the power cable 100A, 100B, 100C. It is configured to have a smaller diameter compared to the

When the current Ic flows along the conductors 131A, 131B, and 131C of the power cables 100A, 100B, and 100C, the conductive member 1100, The current induced by the current Ic flowing along the conductors 131A, 131B, and 131C, that is, the induced current Is, flows through 1200 and 1300 .

Referring to FIG. 4B , the conductors 131A, 131B, and 131C may have an impedance including a resistive component Rc and an inductance component Xc, and the conductive members 1100 , 1200 , and 1300 are similarly formed. It may be composed of an impedance including a resistive component (Rs) and an inductance component (Xs). In this case, the magnitude of the induced current Is induced in the conductive members 1100 , 1200 , and 1300 is as follows [Equation 1].

In Equation 1, 'Zs' denotes the impedance of the conductive member, and 'Es' denotes an induced voltage. However, the direction of the current induced in the conductive member is induced in the opposite direction to the direction of the current flowing along the conductors 131A, 131B, and 131C. Therefore, the electromagnetic waves (B) emitted to the outside of the power cables (100A, 100B, 100C) at positions spaced apart by a predetermined height (h) from the power cables (100A, 100B, 100C) are the conductors (131A, 131B, 131C) It is determined by the vector sum of the electromagnetic wave of the current Ic flowing along the , and the electromagnetic wave of the current Is induced along the conductive member. In this case, since the conductor current and the current of the conductive member flow in opposite directions, they basically cancel each other out. As a result, the electromagnetic wave caused by the current flowing through the conductor is canceled by the electromagnetic wave of the current induced in the conductive member, thereby preventing the generation of the electromagnetic wave.

6 is a graph of measuring the intensity of electromagnetic waves leaking from the power cable when the conductive member is not provided as shown in FIG. 3(B), and FIGS. 7 and 8 are passive according to FIGS. 3 and 4, respectively It is a graph measuring the strength of electromagnetic waves when a loop is formed.

Referring to FIG. 6 , it can be seen that the maximum intensity of electromagnetic waves generated when a passive loop is not configured in the power cable 100 is approximately 100 to 120 μT, and has a relatively high value.

On the other hand, referring to FIGS. 7 and 8 in which the passive loop is configured, the maximum intensity of the electromagnetic wave is approximately 15 μT, and it can be seen that the intensity of the electromagnetic wave is significantly reduced compared to the case in which the passive loop is not configured.

The passive loop method described above has an advantage in that the electromagnetic wave can be reduced without changing the internal configuration of the power cable, but the temperature of the power cable may increase due to the conductive member constituting the passive loop, and accordingly, the power cable There is a problem in that the current capacity flowing along the is reduced. Hereinafter, various embodiments of the present invention for solving the above-described problems occurring when the passive loop method is applied will be described.

9 is a plan view showing the configuration of a conductive shielding cooling system 3000 for a power cable according to an embodiment of the present invention. The conductive shielding cooling system 3000 according to FIG. 9 is a configuration embedded in the ground, and the drawings show the system embedded in the ground for convenience.

Referring to FIG. 9 , the conductive shielding cooling system 3000 includes a pair of power cables 100 or power cable assemblies 1000A and 1000B having at least one conductor 131 (see FIG. 1 ) through which current flows. (hereinafter referred to as 'power cable') is provided adjacent to the intermediate connection part 200 and the intermediate connection part 200 for connecting to each other and is induced by the current flowing along the conductor 131 of the power cable 100 A conductive member 2200 (refer to FIG. 10) through which an induced current flows and a cooling unit 2300 (refer to FIG. 10) through which a cooling fluid 2400 (refer to FIG. 10) for cooling the power cable 100 flows is provided. At least one conductive cooling pipe 2000 is provided.

The conductive cooling pipe 2000 is disposed adjacent to the intermediate connection part 200 that connects the power cables 100 to each other, and is provided to form a closed loop along the intermediate connection part 200 . The reason why the conductive cooling pipe 2000 constitutes a closed loop is because the conductive cooling pipe 2000 includes a cooling unit 2300 through which the cooling fluid 2400 flows, as will be described later. Accordingly, the cooling fluid 2400 flows along the conductive cooling pipe 2000 constituting the closed loop to cool the power cable 100 or the conductive member 2200, thereby increasing the temperature of the power cable 100. to prevent a decrease in the capacity of the conductor 131 of the power cable 100 .

Furthermore, the conductive shielding cooling system 3000 for the power cable may further include a circulation unit 2105 for circulating the cooling fluid 2400 along the conductive cooling pipe 2000 . Although not shown in the drawing, the circulation unit 2105 may include a pumping unit for pumping the cooling fluid 2400, and may supplement the cooling fluid 2400 when the cooling fluid 2400 is insufficient. It may include a cooling fluid storage tank (not shown).

10 is a view showing the arrangement of the power cables 100A, 100B, 100C and the conductive cooling pipe 2000 in the conductive shielding cooling system 3000 for the power cable.

Referring to FIG. 10 , in the present embodiment, the conductive cooling pipe 2000 includes a plurality of the power cables 100A, 100B, and 100C, for example, three power cables 100A, 100B, and 100C. ) is provided on both sides of the pair.

The conductive cooling pipe 2000 is provided inside the outer pipe member 2100 and the outer pipe member 2100 provided adjacent to the power cables 100A, 100B, 100C and the power cables 100A, 100B, A conductive member 2200 through which an induced current induced by a current flowing along the conductor 131 of 100C flows may be provided. In addition, the conductive cooling pipe 2000 includes a cooling unit 2300 for cooling the power cables 100A, 100B, 100C or the conductive member 2200, and the cooling unit 2300 includes the conductive member ( 2200) and an inner pipe member 2350 provided inside the inner pipe member 2350, and the cooling fluid 2400 flowing along the inside of the inner pipe member 2350.

Specifically, the conductive cooling pipe 2000 is provided with an outer pipe member 2100 on the outermost side. The outer pipe member 2100 is shown in the drawing in a circular shape, but is not limited thereto and may be appropriately formed in a polygonal shape such as a quadrangle. The outer pipe member 2100 may be made of metal, for example, of a ferromagnetic material such as aluminum or copper.

The conductive member 2200 is provided inside the outer pipe member 2100 . The material of the conductive member 2200 may be appropriately selected so that an induced current flows, and as described above, the induced current flowing from the conductor 131 is the current of the conductor 131 in the conductive member 2200 . It is configured to flow in the opposite direction to the flow to suppress the generation of electromagnetic waves. Since this has already been described above, a repetitive description thereof will be omitted.

On the other hand, the inside of the conductive member 2200 is provided with a cooling unit 2300 for cooling the conductive member 2200 or the power cables (100A, 100B, 100C). The cooling unit 2300 includes an inner pipe member 2350 disposed inside the conductive member 2200 , and a cooling fluid 2400 flows along the inner space of the inner pipe member 2350 . The cooling fluid 2400 flows along the inner pipe member 2350 by the aforementioned circulation unit 2105 . The cooling fluid 2400 is the conductive member 2200 or the electric power through heat exchange with the conductive member 2200 or the power cables 100A, 100B, and 100C while flowing along the inner pipe member 2350. The temperature rise of the cables 100A, 100B, and 100C is prevented.

Accordingly, the cooling fluid 2400 flows along the inner pipe member 2350 of the conductive cooling pipe 2000 to cool the conductive member 2200 or the power cables 100A, 100B, and 100C. (100A, 100B, 100C) is prevented from increasing the current capacity of the conductor 131 of the power cable (100A, 100B, 100C) is suppressed.

Meanwhile, although not shown in the drawings, the conductive cooling pipe 2000 may further include a protective layer (not shown) for preventing corrosion. When the conductive cooling pipe 2000 is buried underground, the conductive cooling pipe 2000 made of metal or the like may corrode over time due to the surrounding environment of the underground. Since the conductive cooling pipe 2000 is buried in the ground, when corrosion occurs, the conductive cooling pipe 2000 must be exposed to the ground again for repair, so the time and cost required for the repair are significantly increased. Accordingly, the conductive cooling pipe 2000 may further include a protective layer for preventing corrosion of the conductive cooling pipe 2000 before being buried in the ground. The protective layer may be made of, for example, polyethylene, PVC, or rubber.

Meanwhile, FIGS. 11 to 13 are views illustrating the arrangement of the power cables 100A, 100B, and 100C and the conductive cooling pipe 2000 in the conductive shielding cooling system for the power cable according to another embodiment.

Referring to FIG. 11 , the conductive cooling pipe 2000 may be configured as a pair and provided at upper and lower portions of each of the power cables 100A, 100B, and 100C. Also, referring to FIG. 12 , the conductive cooling pipe 2000 may be disposed on one side of each of the power cables 100A, 100B, and 100C.

Meanwhile, referring to FIG. 13 , the conductive cooling pipe 2000 includes a pair of first conductive cooling pipes 2000A provided on both sides of the power cables 100A, 100B, and 100C and the first conductive cooling pipe ( 2000A) and a pair of second conductive cooling pipes 2000B configured separately from each other may be provided. FIG. 13 is different from the configuration of FIG. 10 in that the second conductive cooling pipe 2000B is further provided.

That is, when shielding of electromagnetic waves is not sufficient in the configuration of FIG. 10 , for example, when the intensity of generated electromagnetic waves exceeds a predetermined allowable reference value, the second conductive cooling pipe 2000B may be further provided. In the drawings, the second conductive cooling pipe 2000B is illustrated as being spaced apart from the power cables 100A, 100B, and 100C relatively compared to the first conductive cooling pipe 2000A, but is not limited thereto. The position and number of the second conductive cooling pipes 2000B may be appropriately adjusted.

Meanwhile, FIG. 14 is a plan view showing the configuration of a conductive shielding cooling system 4000 for a power cable according to another embodiment of the present invention.

Referring to FIG. 14 , the conductive shielding cooling system 4000 is disposed along a predetermined area of the power cable 100 . That is, in the case where shielding of electromagnetic waves generated from the power cable 100 is required, but there is no intermediate connection part 200 , the conductive shielding cooling system 4000 may be disposed along a predetermined area of the power cable 100 . can Since the configuration and effects of the conductive shielding cooling system 4000 have already been described above, a repetitive description will be omitted.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims described below. You can do it. Therefore, if the modified implementation basically includes the elements of the claims of the present invention, all of them should be considered to be included in the technical scope of the present invention.

100...power cable
131...Conductor
132...insulation layer
133...Inner semiconducting layer
134...outer semiconducting layer
200...Intermediate connection
2000...conductive cooling pipe
2100...Outer pipe member
2200...conductive member
2300...cooling
2350...Inner pipe member
2400..Cooling fluid
3000, 4000...conductive shielded cooling system

Claims (10)

an intermediate connection unit for connecting a plurality of power cables to each other; and
At least one conductive cooling pipe provided adjacent to the intermediate connection part and having a conductive member through which an induced current induced by a current flowing along a conductor of the power cable flows, and a cooling part through which a cooling fluid for cooling the conductive member flows. ; and
The cooling unit is provided inside the conductive member and a conductive shielding cooling system for a power cable, characterized in that it includes an inner pipe member through which the cooling fluid flows. According to claim 1,
The conductive cooling pipe is
an outer pipe member provided adjacent to the intermediate connection part; and
and the conductive member provided inside the outer pipe member and through which an induced current induced by a current flowing along the conductor of the power cable flows. delete According to claim 1,
The conductive cooling pipe is provided to constitute a closed loop,
The conductive shielding cooling system for the power cable further comprises a circulation unit for circulating the cooling fluid along the conductive cooling pipe. According to claim 1,
The conductive cooling pipe is a conductive shielding cooling system for a power cable, characterized in that it further comprises a protective layer for preventing corrosion. a power cable having at least one conductor through which current flows; and
at least one conductive cooling pipe provided adjacent to the power cable and having a conductive member through which an induced current induced by a current flowing along the conductor of the power cable flows and a cooling unit through which a cooling fluid for cooling the conductive member flows; to provide
The cooling unit is provided inside the conductive member and a conductive shielding cooling system for a power cable, characterized in that it includes an inner pipe member through which the cooling fluid flows. 7. The method of claim 6,
The conductive cooling pipe is
an external pipe member provided adjacent to the power cable; and
and the conductive member provided inside the outer pipe member and through which an induced current induced by a current flowing along the conductor of the power cable flows. delete 7. The method of claim 6,
The conductive cooling pipe is provided to constitute a closed loop,
The conductive shielding cooling system for the power cable further comprises a circulation unit for circulating the cooling fluid along the conductive cooling pipe. 7. The method of claim 6,
The conductive cooling pipe is a conductive shielding cooling system for a power cable, characterized in that it further comprises a protective layer for preventing corrosion.

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