KR20230057583A - The magnetic flux density reduction facility utilizing ferromagnetic material at power cable outside space - Google Patents

Abstract

Problems are resolved by moving facilities on the ground into the ground by constructing a power port-pipe-manhole in the ground and installing a power cable through the power port-pipe-manhole to replace an electric pole for power distribution and a steel tower for power transmission installed in aerial space. However, despite such efforts, power cables have been constructed underground but electromagnetic wave problems recently have been rising in the vicinity where the power cables are constructed. In the present invention, in the case of a single-phase cable, a C-shaped shielding channel, a halved C-shaped shielding channel, or an extended shielding channel is made of a ferromagnetic substance and is installed as if enclosing the vicinity of the power cable, and both ends (the starting point and the ending point) of the C-shaped shielding channel are connected by a wire to form a closed circuit in which the C-shaped shielding channel, the wire, and the C-shaped shielding channel are repeated to form a shielding body in which a circulating current can flow to generate reverse magnetic fields in opposite directions in accordance with Lenz's law to cancel each other out to greatly reduce the magnetic flux density. A ferromagnetic perforated plate or a ferromagnetic net made of a ferromagnetic substance is used as the material of which the C-shaped shielding channel, the halved C-shaped shielding channel, or the extended shielding channel is made to allow the power cable placed in the shielding channel to be seen and allow air to be distributed to be cooled and monitored to greatly increase user satisfaction.

Description

The magnetic flux density reduction facility utilizing ferromagnetic material at power cable outside space}

Power cable outer space magnetic flux density reduction facility

In order to support transmission and distribution lines for transporting electric power, transmission steel towers and distribution poles have been constructed as supports. However, as the downtown area expands and the living environment improves, the necessity of transmission pylons and distribution poles is acknowledged, but they emerge as objects to be removed due to aesthetic problems regarding the space they occupy, space accessibility restrictions, and electromagnetic wave generation problems. there is.

In order to replace the power transmission towers and distribution poles installed in the processing space, power conduits, conduits, and manholes, which are structures, are constructed underground, and power cables are installed through the conduits, conduits, and manholes to move facilities on the ground underground. I am solving the problem. However, even though the power cable is built underground, electromagnetic wave problems have recently emerged in the vicinity where the power cable is constructed. The power cable is not a problem because it shields almost all electric fields, and if you analyze the electromagnetic wave problem, it can be said that it is a problem of the density of the magnetic flux of the magnetic field distributed in space. Since magnetic flux density cannot be completely eliminated due to the nature of the magnetic field, “How much can it be reduced?” It comes down to the question of A metal sheath that serves as an electromagnetic shield is used in power cables. The currently adopted metal sheaths are an aluminum sheath and a copper sheath. Application No. 1997-039015 [wave type simultaneous sheath power cable] relates to a copper sheath, and the sheath of a power cable currently made and commonly used is an aluminum sheath. In the current technical situation in which non-ferrous metals such as copper and aluminum are used as sheaths, the relative magnetic permeability of copper and aluminum is about 1.0, so it is almost the same as the relative magnetic permeability of air and vacuum, so there is no function to reduce the magnetic field density. It is necessary to develop a new technology to reduce the magnetic field density affecting the surrounding environment space in the power cable.

Considering that the magnetic flux density (B) in the power cable continuously affects the surrounding living environment with a fairly large number, consider reducing the magnetic field strength (H) when the magnetic field strength (H) is too large. Identify the characteristics of materials to be used to reduce magnetic flux density (B) in power facilities such as ferromagnetic, paramagnetic, and diamagnetic materials. When the magnetic field changes in an arbitrary space, to prevent this change, analyze the phenomenon that appears as a reaction in the space where the magnetic field is formed in the reverse direction, and find a theoretical basis to use it to reduce the magnetic flux density (B). We seek ways to apply Lenz's law to equipment configuration.

According to Lenz's law, it uses the principle that current flows so that a reverse magnetic field is generated in a direction that opposes the change of the magnetic field. After making a plate with ferromagnetic material, connect both ends (start and end points) of the plate with ferromagnetic material with wires so that circulating current can flow, creating a closed circuit that repeats ferromagnetic plate - wire - again ferromagnetic plate so that circulating current can flow. After making a C-type shielding channel, half C-type shielding channel, or extended shielding channel with this board, it is installed to cover the power cable so that the magnetic field generated from the power cable or the strength of the magnetic field is always changing (AC in the KEPCO power system is 60Hz). As it changes), it should appear significantly reduced in the external space passing through the C-type shielding channel, half-half C-type shielding channel, or extension shielding channel installed to wrap outside the power cable.

The urban space where people live gradually expands, and the overhead transmission and distribution network that relied on steel towers and poles to supply electricity was in danger of being demolished. In order to replace the power transmission towers and distribution poles installed in the processing space, power conduits, conduits, and manholes are built underground, and power cables are installed through the conduits, conduits, and manholes to move facilities on the ground underground to solve problems. are solving However, even though the power cable is built underground, electromagnetic wave problems have recently emerged in the vicinity where the power cable is constructed. Since almost all electric fields are shielded in the power cable, it is not a problem, and if the electromagnetic wave problem is analyzed, it can be said that it is a problem of density of magnetic flux. Since magnetic flux density cannot be completely eliminated due to the nature of the magnetic field, “How much can it be reduced?” It comes down to the question of

In the present invention, in the case of a single-phase cable, a C-type shielding channel, a half C-type shielding channel, or an extended shielding channel is made of ferromagnetic material, installed as if wrapping around the power cable, and both ends (start and end points) of the C-type shielded channel are connected with wires. By creating a closed circuit that is repeated with C-type shielding channel - wire - C-type shielding channel again, creating a shielding body that allows circulating current to flow, creating a reverse magnetic field in the opposite direction according to Lenz's law to cancel each other so that magnetic flux density (magnetic flux) density) was greatly reduced. A ferromagnetic perforated board or a ferromagnetic net made of ferromagnetic material is used as a material for making a C-type shielding channel, a half C-type shielding channel, or an extended shielding channel with a ferromagnetic material, so that the power cable placed in the shielding channel is visible from the outside and air is circulated so that cooling and cooling By enabling monitoring, user satisfaction was greatly increased.

1 is an explanatory diagram of a power cable structure;
2 is a photo explanatory diagram in which a triangular array power cable is separated into single phases.
3 is an explanatory diagram of concentric magnetic field formation by endless conductor current.
Figure 4 is an explanatory view of a cylindrical ferromagnetic installation case outside the power cable.
5 is an explanatory diagram of a reverse magnetic field induced current circulating circuit.
6 is an explanatory diagram of the strength sum of a magnetic field due to a cylindrical ferromagnetic material.
7 is a C-type shielding channel installation explanatory diagram.
8 is a diagram illustrating the installation of a half C-type shielding channel.
9 is an explanatory diagram for installing an extension shielding channel.
10 is an explanatory diagram of a ferromagnetic material to be used for a shielding channel.
11 is an explanatory diagram of a current circulation circuit connected to a ground line.
12 is an explanatory diagram of an insulation method when fixing a shielding channel.

1 is an explanatory diagram of a power cable structure; At the center of the power cable is a conductor 11 that carries current. In addition, the semiconductive tape 12 and the inner semiconductive layer 13, which smooth the high-voltage electric field, are sequentially positioned. An insulating layer 14 lowering the potential exists outside the inner semiconducting layer 13 . These days, cross-linked polyethylene (XLPE) is mainly used as an insulating material. Outside the insulating layer 14, an extruded semiconducting layer 15 and an external semiconducting layer 16 are provided for the purpose of electric field smoothing. A sheath 17 is installed on the outside and grounded to try to maintain zero potential by discarding residual charge. Usually, an aluminum sheath is used, but technology for simultaneous sheath is also being introduced. In addition, an anticorrosive layer 18 is installed outside the sheath 17 to maintain insulation performance and prevent corrosive substances such as water from meeting the sheath 17. Even when these power cables are installed, the electric field caused by electrons is almost completely removed from the metal sheath (Sheath) 17, and it has become a safe facility even if touched with bare hands during operation. However, due to the nature of the magnetic field, the magnetic field cannot be completely blocked, so it is inevitable to form a magnetic field outside the power cable, and the intensity (H) of the magnetic field goes beyond power structures such as power outlets, conduits, and manholes to the external space where people live. According to it, even a large magnetic flux density (B) is detected, causing an electromagnetic wave hazard. Although it is impossible to completely eliminate the magnetic flux density (B), the present invention proposes a method for reducing it as much as possible.

2 is a photo explanatory diagram in which a triangular array power cable is separated into single phases. As described in FIG. 1, the power cable forms a magnetic field up to the outer space, and the strength (H) of the magnetic field has a value other than zero. In consideration of this, when installing power cables, a three-phase regular triangular arrangement (23) is used as a rule. If the three-phase regular triangular array (23) is used, a magnetic field is formed up to the external space, and even if the magnetic field strength (H) has a value other than zero, the three-phase effect is in the form of an equilateral triangle, so the three-phase sum is zero (Zero). ), so there is no problem. However, if there is no other way but to dismantle the three-phase regular triangular array 23 and use the phase-specific fixing cleat 22 to form a single-phase separation array 21 according to the need for connection, etc., the magnetic field for each phase is external. Since the sum of the influences on a point is not zero, it is a problem for the outer space magnetic field.

, 반경2r위치자계세기(32)는

로 계산된다. 전류가 흐르는 도체에서 멀수록 작아짐을 알 수 있다. 3 is an explanatory diagram of concentric magnetic field formation by endless conductor current. Since the power cable is a very long power line, it can be viewed as a kind of wire having an infinite conductor 11 in analysis. A magnetic field as shown in the figure is formed in the infinite conductor (11) according to the right-hand rule of the infinite conductor current (I) (30) Ampere. The radius r position magnetic field strength 31 is

, the radius 2r position magnetic field strength 32 is

is calculated as It can be seen that the farther from the conductor through which the current flows, the smaller it is.

, 케이블전류에의한H(2r)(42)은

로 나타내었다. 자속밀도(B)는 자계의세기(H)에 따라 달라지는데 다음식으로 계산된다.

이다. 강자성체는 외부 자기장에 강하게 자화하는 물질이고, 상자성체는 외부 자기장에 약하게 자화하는 물질을 일컫는다. 철은 강자성체로서 비투자율이 탄소성분 포함 비율 및 방향성에 따라 6,000 ∼ 200,000 정도로 큰 값을 보이고, 상자성체인 비철금속 구리, 알루미늄은 비투자율이 약1로서 공기와 자화성능이 같다.Figure 4 is an explanatory view of a cylindrical ferromagnetic installation case outside the power cable. A cylindrical ferromagnetic material 40 having a radius r and a cylinder length 44 L is installed outside the power cable 43. H(r)(41) due to cable current is

, H(2r)(42) by cable current is

indicated by The magnetic flux density (B) depends on the strength of the magnetic field (H) and is calculated by the following equation.

am. A ferromagnetic material is a material that is strongly magnetized in an external magnetic field, and a paramagnetic material is a material that is weakly magnetized in an external magnetic field. Iron is a ferromagnetic material, and its relative magnetic permeability is as high as 6,000 to 200,000 depending on the carbon component content ratio and orientation.

에 의해 발생하고,유기되는 역기전력의 크기는 식을 유도하면,

(여기서

: 투자율, B: 자속밀도, S: 면적, L: 길이, H; 자계의 세기)이므로

값에 비례한다. 따라서

값이 큰 강자성체를 택하면 폐회로에 전류는 커지고 렌츠의 법칙에 의거하여 전력케이블에 의해 발생한 자계를 방해하는 역자계의 크기도 커진다. 역자계유발순환전류(i)(54)는

(여기서 R: 전류순환회로의 저항)으로 계산된다. 전력케이블(43)에 무한장도체전류(I)(30)가 흐르면 중심에서 거리가 반경r 만큼 떨어진 강자성체(40) 표면과 중심에서 거리가 반경2r 만큼 떨어진 지점의 케이블전류에의한H(41)은

, 케이블전류에의한H(2r)(42)은 로

나타난다. 렌츠의법칙에 의하여 전력케이블에 의해 발생한 자속과 반대방향으로 역자계전류에의한H(r)(51)인

과 역자계전류에의한H(2r)(52)인

가 중심에서 거리가 반경r 및 반경2r 만큼 떨어진 지점에 발생한다. 무한장 도체(11)의 무한장도체전류(I)(30)가 일정한 크기를 유지한다고 가정할 경우 케이블 전류에의한 자계의세기(

)는 일정한 값을 유지하는 가운데, 이와 반대방향으로 자계가 형성되는 역자계전류(i)에 의한 자계의세기(

)는 원통형강자성체(40) 비투자율이 클 수록, 원통길이(44)가 L이 길수록, 원통형 강자성체(40)가 전력케이블(43)과 떨어진 거리r이 가까울수록 큰 값을 나타낸다. 5 is an explanatory diagram of a reverse magnetic field induced current circulating circuit. In FIG. 4, if a closed circuit connection wire 53 electrically connecting the start and end points of a cylindrical ferromagnetic body 40 having a radius r and a cylinder length 44 L is installed, the ferromagnetic body 40 - closed circuit connection wire 53 - The reverse magnetic field induced circulating current (i) (54) flows again into the closed circuit of the ferromagnetic material (40). According to Lenz's law, it can be seen that a closed circuit exists in a magnetic field, and if there is a change in magnetic flux passing through the closed circuit, current flows in the closed circuit so that magnetic flux is generated in a direction that opposes this change. This law is the law of inertia of nature. The reverse induced electromotive force that causes current to flow in a closed circuit is

The magnitude of the back electromotive force generated by and induced by deriving the equation,

(here

: permeability, B: magnetic flux density, S: area, L: length, H; strength of the magnetic field), so

proportional to the value thus

If a ferromagnetic material with a large value is selected, the current in the closed circuit increases and the magnitude of the reverse magnetic field that interferes with the magnetic field generated by the power cable increases according to Lenz's law. The reverse magnetic field induced circulating current (i) (54) is

(Where R: the resistance of the current circulation circuit). When an infinite conductor current (I) (30) flows in the power cable (43), H (41 )silver

, H(2r)(42) by cable current is

appear. According to Lenz's law, H(r)(51) due to the reverse magnetic field current in the opposite direction to the magnetic flux generated by the power cable

H(2r)(52) due to overcurrent

occurs at a point away from the center by a distance of radius r and radius 2r. Assuming that the infinite conductor current (I) 30 of the infinite conductor 11 maintains a constant level, the strength of the magnetic field due to the cable current (

) maintains a constant value, and the strength of the magnetic field due to the reverse magnetic field current (i) in which the magnetic field is formed in the opposite direction (

) shows a larger value as the relative magnetic permeability of the cylindrical ferromagnetic material 40 increases, as the length L of the cylinder length 44 increases, and as the distance r of the cylindrical ferromagnetic material 40 and the power cable 43 decreases.

과 중심에서 거리가 반경2r의 자계의세기합은 자계시기합(2r)(62)인

로 표시할 수 있다. 원통길이(44)가 L이 길수록, 원통형 강자성체(40)가 전력케이블(43)과 떨어진 거리r이 가까울수록, 원통형 강자성체(40) 비투자율

의 값이 클수록 역자계유발순환전류(i)(54)가 커지고 그에 따른

값이 커질 것이므로 궁극적으로

와

이 작아진다. 전력케이블(43)과 멀리 떨어진 중심에서 거리가 반경2r인 지점의 자계의세기는

로 작아지므로, 같은 지점의 진공중(또는 공기중; 거의 유사) 자속밀도는

로 함께 감소하게 된다. 이렇게 외부공간의 자계밀도가 감소되므로 본 발명의 목표는 달성 가능하다.6 is an explanatory diagram of the strength of a magnetic field due to a cylindrical ferromagnetic material. In the figure, the sum of the magnetic field strengths of the radius r at a distance from the center is the magnetic field sum (r) (61)

The sum of magnetic field strengths of radius 2r at a distance from the center is the magnetic field sum (2r) (62)

can be displayed as The longer the cylindrical length 44 L, the closer the distance r of the cylindrical ferromagnetic body 40 and the power cable 43 is, the closer the cylindrical ferromagnetic body 40 relative magnetic permeability

The larger the value of , the larger the reverse magnetic field induced circulating current (i) (54)

value will increase, so ultimately

and

gets smaller The strength of the magnetic field at a point with a radius of 2r from the center far from the power cable 43 is

, so the magnetic flux density in vacuum (or in air; almost similar) at the same point is

decreases together with Since the magnetic field density in the external space is reduced in this way, the object of the present invention can be achieved.

7 to 11 will be described together. 7 is a C-type shielding channel installation explanatory diagram, FIG. 8 is a half C-type shielding channel installation explanatory diagram, FIG. 9 is an extension shielding channel installation explanatory diagram, and FIG. 11 is an explanatory diagram of the current circulation circuit connected to the ground line. If the power cable installation is a three-phase triangular array (23), three-phase equilibrium is made and there is no need to take countermeasures against the magnetic field, but in the case of a single-phase separation array (21), it is necessary to take countermeasures against the magnetic field. As shown in FIGS. 4 to 6, it is best to install the ferromagnetic material 40 so as to surround the power cable in a cylindrical shape, but in consideration of maintenance of the power cable 43, a C-type shielding channel 70 with some surfaces removed from the cylinder is used as a basis. to be 7 and 11, on the cleat 73 coupled to the horizontal hanger 72 using the fixing means 75 to which the insulating material 76 is applied to the vertical supporter 71 attached to the electric power wall 74 A C-type shielding channel 70 made of ferromagnetic material 40 is installed so that the laid power cable 43 is located inside, and one side of the start and end points of the C-type shielding channel 70 is passed through the wire fixing bolt 111. It is characterized in that a closed circuit is formed by connecting a closed circuit connection wire 53, which is an insulated wire. The working principle is as follows. When current flows through the power cable 43, a change in magnetic field occurs around the C-type shielded channel 70, and accordingly, in the closed circuit connecting the C-type shielded channel 70 and the closed circuit connection wire 53 according to Lenz's law, such Since the direction to block the magnetic field change is opposite and the C-type shielding channel 70 is ferromagnetic, it induces a reverse magnetic field induced circulating current (i) 54 that generates a strong reverse magnetic field, thereby preventing a change in magnetic field in the external space. Decrease. As alternating current continues to flow in the power cable 43, a reverse magnetic field in the opposite direction to the change in magnetic field is generated, which cancels each other out, thereby preventing and reducing the change in magnetic field in the external space. Priority is given to selecting iron (Fe), which is the most economical among ferromagnetic materials that make the C-type shielding channel 70. In order to complement the C-type shielding channel (70) with some surfaces removed from the cylinder, the present invention also includes the construction of a casement door (78) installed using feldspar (77) on the surface removed from the C-type shielding channel (70). do. In addition, in order to increase the circulating current flowing through the closed circuit connection wire 53, a reactance compensation capacitor (not shown) is inserted into one side of the closed circuit connection wire 53 to reduce impedance. When the circulating current flowing through the closed circuit connection wire 53 is large, the magnetic field in the reverse direction becomes large, and the intensity of the magnetic field directed to the outside is further reduced. As another method, as shown in FIGS. 8 and 11, the cleat coupled on the horizontal hanger 72 by using the fixing means 75 to which the insulating material 76 is applied to the vertical supporter 71 attached to the power wall 74 ( 73) In order to facilitate the installation of the C-type shielding channel 70 made of ferromagnetic material 40 so that the power cable 43 placed on it is located inside, the C-type shielding channel 70 is divided into two and divided into half C-type shielding channels ( 80) and connect the two half-C type shielding channels (80) through the coupling means (81) to install the C-type shielding channel (70) instead, and the starting point and the end point of the half-C type shielding channel (80) It is characterized in that one side is configured by making a closed circuit by connecting the closed circuit connection wire 53, which is an insulated wire, through the wire fixing bolt 111. And as another example, as shown in the left picture of FIG. 9 and FIG. 11, on the horizontal hanger 72 by using the fixing means 75 to which the insulating material 76 is applied to the vertical supporter 71 attached to the electric power wall 74 Instead of the C-type shielding channel 70 made of ferromagnetic material 40 so that the power cable 43 placed on the combined cleat 73 is located inside, single-phase and two or more power cables 43 are vertically arranged inside A closed-circuit connection wire (which is an insulated wire) is installed by making and installing a C-type shielding channel vertically extending the C-type shielding channel with ferromagnetic material as shown in Fig. 53) to form a closed circuit. Here, as shown in the right figure of FIG. 9, several power cables 43 are simultaneously accommodated in the extension shielding channel 90, and a partition plate 91 made of ferromagnetic material 40 is installed between each power cable 43. Doing is also included in the scope of the present invention. In FIG. 7 or 8 or 9, it is also included in the present invention to configure the connection sleeve 112 to connect the ground wire 113 to both ends of the closed circuit connection wire 53 forming a closed circuit together with the shielding channel. In addition, in FIG. 7 or 8 or 9 or 10, a C-type shielding channel 70 made of ferromagnetic material 40 or a half C-type shielding channel in order to prevent a decrease in the magnitude of the reverse magnetic field induced circulating current (i) 54 (80) or the extended shielding channel (90) is wrapped with an insulating material, or a C-type shielding channel (70) including a hinged door (78) or half-C-type shielding for monitoring changes around the power cable (43) or for cooling It is also included in the present invention to configure the channel 80 or the extended shielding channel 90 by making a ferromagnetic perforated plate 101 or a ferromagnetic net 102 having a plurality of vents 103 formed thereon.

값이 큰 강자성체를 택하는 것과 발생한 역기전력이 절연차폐매트 일측에서 외부로 누기되지 않도록 강자성체(40) 차폐찬넬을 완벽하게 절연시키는 것이 매우 중요하다.12 is an explanatory diagram of an insulation method when fixing a shielding channel. The C-type shielded channel 70 or the half C-type shielded channel 80 or the extended shielded channel 90 must be completely insulated to maximize the reverse magnetic field induced circulating current (i) 54 when installed. If it is necessary to drill a hole in the shielding channel, drill a shielding mat installation hole (121), thoroughly insulate the hole (122), and fix it using a coupling bolt (123) and a coupling nut (124). In the present invention, the ferromagnetic material 40

It is very important to select a ferromagnetic material having a large value and to completely insulate the shielding channel with the ferromagnetic material 40 so that generated counter-electromotive force does not leak to the outside from one side of the insulating shielding mat.

11: conductor 12: semi-conductive tape
13: internal semiconducting layer 14: insulating layer
15: extruded semiconducting layer 16: external semiconducting layer
17: Sheath 18: Anticorrosive layer
21: single-phase separation arrangement 22: phase-specific fixing cleat
23: three-phase regular triangular array 30: infinite field conductor current (I)
31: Radius r position magnetic field strength 32: Radius 2r position magnetic field strength
40: ferromagnetic material 41: H (r) by cable current
42: H (2r) by cable current 43: power cable
44: cylinder length 51: H (r) by reverse magnetic field current
52: H (2r) by reverse magnetic field current 53: Closed circuit connection wire
54: reverse magnetic field induced circulating current (i) 61: magnetic field timing (r)
62: magnetic timing (2r) 70: C-type shielding channel
71: vertical supporter 72: horizontal hanger
73: cleat 74: power wall
75: fixing means 76: insulating material
77: feldspar 78: hinged door
80: half C-type shielding channel 81: coupling means
90: extended shielding channel 91: partition plate
101: ferromagnetic perforated board 102: ferromagnetic net
103: vent 111: wire fixing bolt
112: connection sleeve 113: ground wire
121: hole 122: insulation in hole
123: coupling bolt 124: coupling nut

Claims (8)

The power cable 43 placed on the cleat 73 coupled to the horizontal hanger 72 using the fixing means 75 to which the insulating material 76 is applied to the vertical supporter 71 attached to the power wall 74 is inside A C-type shielding channel 70 made of ferromagnetic material 40 is installed, and one side of the starting point and the end point of the C-type shielding channel 70 is connected through the wire fixing bolt 111 to the closed circuit connection wire 53, which is an insulated wire. ) A power cable external space magnetic flux density reduction facility using a ferromagnetic material, characterized in that it is configured to create a closed circuit by connecting. The method of claim 1, in order to supplement the C-type shielding channel (70) with some surfaces removed from the cylindrical shape, a casement door (78) is installed using feldspar (77) on the surface removed from the C-type shielding channel (70). A power cable external space magnetic flux density reduction facility using a ferromagnetic material, characterized in that to do. According to claim 1, in order to increase the circulating current flowing in the closed circuit connection wire (53), a reactance compensation capacitor (not shown) is inserted on one side of the closed circuit connection wire (53) to reduce the impedance. Facility for reducing magnetic flux density in external space of power cable using The power cable 43 placed on the cleat 73 coupled to the horizontal hanger 72 using the fixing means 75 to which the insulating material 76 is applied to the vertical supporter 71 attached to the power wall 74 is inside In order to facilitate the installation of the C-type shielding channel 70 made of ferromagnetic material 40 to be located on the right, the C-type shielding channel 70 is divided into two to create a half-C-type shielding channel 80 and two half-C-type shielding channels (80) is connected through the coupling means (81) to install the C-type shielding channel (70) instead, and insulate one side of the starting point and the end point of the half C-type shielding channel (80) through the wire fixing bolt (111) A power cable external space magnetic flux density reduction facility using a ferromagnetic material, characterized in that a closed circuit is formed by connecting a closed circuit connection wire 53, which is a wire. The power cable 43 placed on the cleat 73 coupled to the horizontal hanger 72 using the fixing means 75 to which the insulating material 76 is applied to the vertical supporter 71 attached to the power wall 74 is inside Instead of the C-type shielding channel 70 made of ferromagnetic material 40 to be located on the inside, the C-type shielding channel is vertically extended with a ferromagnetic material so that the single-phase and two or more power cables 43 are vertically arranged inside the shielding channel ( 90) is made and installed, and one side of the start point and end point of the extension shielding channel 90 is connected to the closed circuit connection wire 53, which is an insulated wire, through the wire fixing bolt 111 to form a closed circuit. Facility for reducing magnetic flux density in external space of power cable using The ferromagnetic material according to claim 5, characterized in that a plurality of power cables (43) are simultaneously accommodated in the extended shielding channel (90) and a partition plate (91) made of a ferromagnetic material is installed between each power cable (43). Utilized power cable external space magnetic flux density reduction facility. According to claims 1 and 4 to 5, it is characterized in that the connection sleeve 112 is used to connect the ground wire 113 to both ends of the closed circuit connection wire 53 forming a closed circuit together with the shielding channel. Facility for reducing magnetic flux density in external space of power cable using ferromagnetic material that The C-type shielding channel (70) or half-half C-type shielding channel made of ferromagnetic material (40) in order to prevent the size reduction of the reverse magnetic field induced circulating current (i) (54) according to claims 1 and 4 to 5. (80) or extended shielding channel (90) coated with an insulating material, monitoring changes around the power cable (43) or C-type shielding channel (70) including a hinged door (78) or half C-type shielding for cooling Power cable external space magnetic flux density reduction facility using ferromagnetic material, characterized in that the channel 80 or the extended shielding channel 90 is made of a ferromagnetic perforated plate 101 or a ferromagnetic net 102 having a plurality of ventilation holes 103 formed therein .

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