KR102436277B1 - Power cable - Google Patents

Abstract

The present invention has the flame retardancy of IEC 60332-3 standard category A class (IEC 60332-3-22) of the vertical flame spread of vertically-mounted bunched wires or cables while being composed of a conventional material. It relates to a secured power cable for distribution.

Description

POWER CABLE

The present invention relates to a power cable. In more detail, the present invention is composed of a conventional material, while the vertical flame spread of the cable (Test for vertical flame spread of vertically-mounted bunched wires or cables) IEC 60332-3 standard category A class (IEC 60332-3-22) ), it relates to a power distribution power cable with secured flame retardancy.

The present invention has the flame retardancy of IEC 60332-3 standard category A class (IEC 60332-3-22) of the vertical flame spread of vertically-mounted bunched wires or cables while being composed of a conventional material. It is a problem to be solved to provide a secured power cable for distribution.

Most of the insulation layer of the power distribution cable is made of XLPE material. Currently, the XLPE insulation layer for distribution has no flame retardancy and has a high heat transfer rate, so even if a sheath layer with high flame retardancy is applied, the vertical flame propagation test (Test) It is difficult to satisfy IEC 60332-3 standard category A class (IEC 60332-3-22) of vertical flame spread of vertically-mounted bunched wires or cables.

In particular, the volume ratio of the insulation layer of the MV-class distribution cable is 10% higher than the volume ratio of the sheath layer of the distribution cable, so it is judged that it is difficult to satisfy the highest grade A (IEC 60332-3-22).

That is, the sheath layer performs the primary function of preventing flame propagation and preventing the melting of the insulating layer in an environment where a flame is applied, but because the thickness of the sheath layer is relatively thin and the thickness of the insulating layer is thick, Even when simply adding a flame-retardant taping layer to the inside of the sheath layer, it was difficult to satisfy the A grade (IEC 60332-3-22).

The present invention has the flame retardancy of IEC 60332-3 standard category A class (IEC 60332-3-22) of the vertical flame spread of vertically-mounted bunched wires or cables while being composed of a conventional material. It is a problem to be solved to provide a secured power cable for distribution.

In order to solve the above problems, the present invention provides a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer provided outside the inner semiconducting layer, an outer semiconducting layer provided outside the insulating layer, and a metal provided outside the outer semiconducting layer a core comprising a shielding layer; a bedding layer provided outside the core; a glass taping layer formed by transversing a glass tape made of glass fibers on the outside of the core; and a sheath layer surrounding the core, the bedding layer, and the glass taping layer.

In addition, in order to solve the above problems, the present invention provides a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer provided outside the inner semiconducting layer, an outer semiconducting layer provided outside the insulating layer, and provided outside the outer semiconducting layer It is possible to provide a power cable including a plurality of cores including a metal shielding layer, a plurality of cores including a solid bedding layer, and a sheath layer provided outside the bedding layer.

In this case, the inner semiconducting layer of the core may be formed by extruding with a semiconducting compound, and the outer semiconducting layer of the core may be formed by extruding with the semiconducting compound and then transversely winding the outside with a semiconducting tape.

In addition, the metal shielding layer of the core may be formed by winding a tape or braid made of any one of copper, copper alloy, aluminum, and aluminum alloy.

The glass taping layer may be provided inside the bedding layer, and the bedding layer and the sheath layer may be extruded together.

Here, the insulating layer may be composed of a polymer such as XLPE, XLPO, EPR, HEPR, PVC, silicone rubber, and a mixture of the above components.

In this case, the bedding layer and the sheath layer have an oxygen index (LOI) of 35% to 47% PVC, EVA, EPDM, PO, PE, CR, CPE, CSP material or a compound of a mixture containing the same. can

In addition, the bedding layer may be 1.5 millimeters (mm) to 4.0 millimeters (mm), and the sheath layer may be 2.0 millimeters (mm) to 4.5 millimeters (mm).

The glass tape constituting the glass taping layer may be at least one of a urethane-coated glass tape, a silicone-coated glass tape, and a ceramic-coated glass tape.

Here, the glass taping layer is formed by transversely winding 6 to 9 glass tapes, and may have a thickness of 0.7 millimeters (mm) to 1.3 millimeters (mm).

In this case, the glass taping layer may include a first glass taping layer and a second glass taping layer inside and outside the bedding layer, respectively.

In addition, a thickness of the second glass taping layer may be greater than a thickness of the first glass taping layer.

The thickness of the first glass taping layer may be 0.20 millimeters (mm) to 0.45 millimeters (mm), and the thickness of the second glass taping layer may be 0.50 millimeters (mm) to 0.85 millimeters (mm).

Here, the first glass taping layer and the second glass taping layer may be formed by horizontally winding 2 to 3 and 4 to 6 glass tapes, respectively.

In this case, a glass taping layer formed by transversing a glass tape made of glass fibers between the bedding layer and the sheath layer may be further provided.

In addition, the glass taping layer may be formed by horizontally winding one to three glass tapes, and may have a thickness of 0.12 millimeters (mm) to 0.48 millimeters (mm).

In addition, the bedding layer and the sheath layer are extruded together, and the thickness of the sheath layer may be 2.0 millimeters (mm) to 6.0 millimeters (mm).

The power cable according to the present invention is composed of a common material, but also has IEC 60332-3 standard category A class (IEC 60332-3-22) of vertical flame spread of vertically-mounted bunched wires or cables. ) can be secured.

1 shows an embodiment of a single-phase power cable among power cables according to the present invention.
2 shows another embodiment of a single-phase power cable among the power cables according to the present invention.
3 shows one embodiment of a three-phase power cable among power cables according to the present invention.
4 shows another embodiment of a three-phase power cable among the power cables according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and the spirit of the invention may be sufficiently conveyed to those skilled in the art. Like reference numbers refer to like elements throughout.

1 shows an embodiment of a single-phase power cable among power cables according to the present invention.

The power cable according to the present invention includes a conductor 10, an inner semiconducting layer 20 surrounding the conductor 10, an insulating layer 30 provided outside the inner semiconducting layer 20, and the insulating layer 30 on the outside. The outer semiconducting layer 40 provided, the core 100 including the metal shielding layer 50 provided outside the outer semiconducting layer 40, the bedding layer 300 provided outside the core 100, the A glass taping layer 200 formed by transversely winding a glass tape made of glass fibers on the outside of the core 100, and a sheath layer surrounding the core 100, the bedding layer 300, and the glass taping layer 200 ( 400) may be included.

The power cable according to the present invention is specifically classified as IEC 60332-3 standard category A (Test for vertical flame spread of vertically-mounted bunched wires or cables) using conventional materials (IEC 60332-3). -22) is intended to be satisfied.

The vertical flame propagation test is a test to verify how much flame it can withstand when the cable is installed in a building.

Remove all metallic materials from the test cable, measure its weight, measure the specific gravity of the material, and arrange a plurality of cables vertically so that the volume per length of non-metallic material becomes 7L/m in case of Category A. If the length of combustion or carbonization of the cable made of non-metallic material becomes 2.5 m or less by applying a flame at the bottom of the tube for 40 minutes, it is judged that the IEC 60332-3 standard category A class (IEC 60332-3-22) test has been passed. As a widely known flame test method, detailed description of the flame test method is omitted.

The power cable according to the present invention includes a conductor 10, an inner semiconducting layer 20 surrounding the conductor 10, an insulating layer 30 provided outside the inner semiconducting layer 20, and the insulating layer 30 on the outside. A core 100 including an outer semiconducting layer 40 provided and a metal shielding layer 50 provided outside the outer semiconducting layer 40 is provided.

The conductor 10 of the core 100 is Class 2 (Stranded conductor intended for fixed installation) or Class 5 (Flexible conductor) satisfying IEC 60228, an international standard related to the conductor 10 of the International Electrotechnical Commission (IEC). The conductor 10 for the purpose may be applied.

When XLPE or the like is used as a material of the insulating layer 30 to be described later, copper (Cu), aluminum (Al), or alloys thereof may be used for the conductor 10 .

Copper (Cu) conductors account for most of underground cable conductor materials because of their excellent electrical properties, high workability and economical efficiency. It is a material with economically advantageous conditions than copper (Cu) because its conductivity is 2/3 of copper and has relatively good conductivity.

An inner semiconducting layer 20 , an insulating layer 30 , and an outer semiconducting layer 40 may be sequentially provided on the outside of the conductor 10 of the core 100 .

Each of the inner semiconducting layer 20 and the outer semiconducting layer 40 may be formed by extruding using a semiconducting compound.

The outer semiconducting layer 40 may be formed by extruding a semiconducting compound, and then a semiconducting tape may be added by separately rolling the semiconducting tape 1 to 3 times. Of course, it is also possible to configure the inner semiconducting layer 20 or the outer semiconducting layer 40 by transversing the semiconducting tape without extruding itself.

The insulating layer 30 provided between the inner semiconducting layer 20 and the outer semiconducting layer 40 may be composed of a polymer such as XLPE, XLPO, EPR, HEPR, PVC, silicone rubber, and a mixture of the above components. .

As a representative material of the insulating layer, XLPE (Cross-linked polyethylene) insulation is widely used because of its excellent insulation ability, easy installation and connection work, and simplicity of maintenance and repair. , weight, low packaging cost, and low material cost.

However, as the material of the insulating layer 30, XLPE, etc., has a property of being easily melted in flames, so in order for the cable to which XLPE is applied to satisfy the IEC 60332-3 standard category A class (IEC 60332-3-22), the bedding layer described later (300) or the sheath layer 400, etc. should be able to sufficiently prevent the flame.

A metal shielding layer 50 provided outside the outer semiconducting layer 40 may be provided. The metal shielding layer 50 of the core 100 may be formed by winding a tape or braid made of any one of copper, copper alloy, aluminum, and aluminum alloy. The thickness t1 of the metal shielding layer 50 may vary according to shielding conditions.

A glass taping layer 200 may be provided on the outside of the core 100 configured as described above by transversely winding a glass tape made of glass fibers on the outside of the core 100 .

The glass taping layer 200 may be provided for the purpose of heat insulation and flame resistance, etc., and the glass taping layer may be formed by winding a glass tape made of glass fibers at least once or more. It may be constructed by transversely winding a glass tape.

A bedding layer 300 or a sheath layer 400 may be provided on the outside of the glass taping layer 200 to protect or flame the cable, but the glass taping layer 200 is the bedding layer 300 . ) or the sheath layer 400 and other properties may be provided to protect the flame.

The glass tape constituting the glass taping layer 200 may be at least one of a urethane-coated glass tape, a silicone-coated glass tape, and Cera and a coated glass tape. When it is composed of a single layer, it is formed by horizontally winding 6 to 9 sheets of glass tape, and the thickness t2 is preferably in the range of 0.7 millimeters (mm) to 1.3 millimeters (mm).

The glass taping layer 200 may be provided inside the bedding layer 300 as shown in FIG. 1 , with the bedding layer 300 interposed therebetween or on both sides of the bedding layer 300 as shown in FIG. 2 . may be provided.

As shown in FIG. 1 , when the glass taping layer 200 is provided as a single layer inside the bedding layer 300 , the bedding layer 300 and the sheath layer 400 may be sequentially provided, respectively, extruded or together It can be extruded integrally. In the latter case, the boundary between the bedding layer 300 and the sheath layer 400 may not substantially exist.

The bedding layer 300 and the sheath layer 400 have an oxygen index (LOI) of 35% to 47% PVC, EVA, EPDM, PO, PE, CR, CPE, CSP material or a compound of a mixture containing them is extruded can be configured. For MV-class distribution cables, PVC is widely used because economic feasibility is an important competitive factor.

PVC means polyvinyl chloride (PVC), which is one of the thermoplastic plastics, which is strong, easy to color, hard or flexible, and has high abrasion resistance. However, although it is difficult to see it as a heat-resistant material, it can serve as a barrier against flames and the like due to its thickness.

In this case, the thickness of the bedding layer 300 is 1.5 millimeters (mm) to 4.0 millimeters (mm), and the thickness of the sheath layer 400 is 2.0 millimeters (mm) to 4.5 millimeters (mm). , the total thickness t3 may be of about 3.5 millimeters (mm) to about 8.5 millimeters (mm).

Unlike the embodiment shown in FIG. 1 , the embodiment shown in FIG. 2 is an embodiment in which the glass taping layer 200 is provided inside and outside the bedding layer 300 , respectively.

Specifically, the first glass taping layer 210 and the second glass taping layer 260 may be disposed with the bedding layer 300 interposed therebetween.

Accordingly, the first glass taping layer 210 , the bedding layer 300 , the second glass taping layer 260 , and the sheath layer 400 are sequentially formed on the outside of the metal shielding layer 50 constituting the core 100 . can be placed as

As described above, the bedding layer 300 and the sheath layer 400 may be made of the same and similar material, and have a similar flame retardant or fire resistant function.

Therefore, it was confirmed that the sheath layer 400 and the glass taping layer 200 can protect the core 100 by alternately responding to a flame applied from the outside due to different properties, so that the flame retardancy performance can be maximized.

In addition, since the second glass taping layer 260 provided on the outside is expected to have greater flame retardancy performance to satisfy the IEC 60332-3 standard category A grade (IEC 60332-3-22), the second glass taping layer It is preferable that the thickness t6 of the 260 is greater than the thickness t2 of the first glass taping layer 210 .

Specifically, the thickness t2 of the first glass taping layer 210 is 0.20 millimeters (mm) to 0.45 millimeters (mm), and the thickness t6 of the second glass taping layer 260 is 0.50 millimeters (mm). ) to 0.85 millimeters (mm), the first glass taping layer 210 and the second glass taping layer 260 may be formed by winding 2 to 3 and 4 to 6 glass tapes, respectively. In general, the glass taping layer 200 is formed by transversely winding 6 to 9 glass tapes, and the total thickness is in the range of 0.7 millimeters (mm) to 1.3 millimeters (mm) compared to the embodiment shown in FIG. The same is true.

Table 1 below is a comparison example of a conventional distribution-class power cables having a conductor diameter of 150 (mm ² ) and a conductor diameter of 150 (mm ² ) according to the present invention shown in FIGS. 1 and 2 of a distribution-class power cable The configuration of the examples and the IEC 60332-3-22 test results are shown.

As shown in the table below, the differences between the comparative examples of conventional cables and the embodiments of the power cable according to the present invention are the presence or absence of the bedding layer 300 therein, the number of layers of the glass taping layer 200 and the glass taping layer 200 ), there is a difference in the number of times of glass taping and winding.

As described in the table below, the bedding layer 300 is present, and the glass taping layer 200 is provided with the bedding layer 300 as a boundary between the inside and the outside of the bedding layer 300 in Example 2 and embodiment. In the case of Example 3, it was possible to pass the IEC 60332-3-22 test, but in the case of Comparative Examples 1 and 2 in which the bedding layer 300 was omitted and the glass tape was cross-wound three times, it was burned in the IEC 60332-3-22 test and was judged unacceptable. And, in the case of a single-phase power cable, when the thickness of the glass taping layer 200 is not sufficient, it is difficult to pass the test regardless of the oxygen index of the sheath layer 400 like the results of Comparative Examples 1 and 2 could confirm that

In this result, the presence or absence of the bedding layer 300 may also have an effect, but it is determined that the number of transverse windings of the entire glass taping layer 200 has a greater influence.

That is, in the case of Embodiment 1, the bedding layer 300 is omitted or is integrally formed with the sheath layer 400 and the glass taping layer 200 is composed of a single layer. If the number of times was 9, it was confirmed that the IEC 60332-3-22 test could be passed.

That is, when the oxygen index of the sheath layer 400 and the thickness of the sheath layer 400 are above a certain level, the thickness of the glass taping layer 200, the number of layers of the glass taping layer 200, and It was confirmed that the presence or absence of the bedding layer 300 can act as a factor determining whether the test is satisfied.

Comparative Example 1 Comparative Example 2 Example 1 Example 2 Example 3 conductor dong dong dong dong dong inner semiconducting layer semiconducting extrusion semiconducting extrusion semiconducting extrusion semiconducting extrusion semiconducting extrusion insulating layer XLPE XLPE XLPE XLPE XLPE outer semiconducting layer Semi-conductive powder extrusion / semi-conductive tape 2 times horizontal winding Semi-conductive powder extrusion / semi-conductive tape 2 times horizontal winding Semi-conductive powder extrusion / semi-conductive tape 2 times horizontal winding Semi-conductive powder extrusion / semi-conductive tape 2 times horizontal winding Semi-conductive powder extrusion / semi-conductive tape 2 times horizontal winding metal shielding layer copper tape copper tape copper tape copper tape copper tape first glass
taping layer X X X glass tape
3 laps glass tape
3 laps
bedding layer
X
X PVC
(oxygen index 40%) PVC
(oxygen index 40%) PVC
(oxygen index 40%) second glass
taping layer glass tape
3 laps glass tape
3 laps glass tape
Episode 9 glass tape
4 laps glass tape
6 laps sheath layer PVC
(Oxygen index 30%) PVC
(oxygen index 45%) PVC
(oxygen index 40%) PVC
(oxygen index 40%) PVC
(oxygen index 40%) IEC 60332-3-22 Category A Class
Test result
Failed (burnout)
Failed (burnout)
pass
pass
pass

One embodiment of a three-phase power cable among power cables according to the present invention is shown, and FIG. 4 shows another embodiment of a three-phase power cable among power cables according to the present invention.

3 and 4, the conductor 10, the inner semiconducting layer 20 surrounding the conductor 10, the insulating layer 30 provided outside the inner semiconducting layer 20, the insulating layer ( 30) a plurality of cores 100 including an outer semiconducting layer 40 provided outside, and a metal shielding layer 50 provided outside the outer semiconducting layer 40; A faithful bedding layer 300 enclosing the plurality of cores 100 faithfully; and a sheath layer 400 provided outside the bedding layer 300 .

The power cable shown in FIGS. 3 and 4 may also include three cores 100 for each phase having the same structure as the core 100 of the power cable shown in FIGS. 1 and 2 . Since the structure or material of the core 100 is consistent with the embodiment shown in FIGS. 1 and 2 , a redundant description will be omitted.

The three-phase power cable shown in FIGS. 3 and 4 has a structure in which the core 100 is arranged in a triangle in a circular cable, and in order to improve the flame retardancy experimentally to satisfy the above grade, each of the three cores 100 It was experimentally demonstrated that the bedding layer 300 should be configured in a faithful manner in a spaced state.

That is, if there is an empty space inside the sheath layer 400 of the three-phase power cable shown in FIGS. 3 and 4, even if the material of each configuration is changed, each core 100 can be sufficiently protected from flame. It was confirmed that it cannot.

In the embodiment shown in FIG. 3 , the glass taping layer 200 does not exist between the faithful bedding layer 300 and the sheath layer 400 , and in the embodiment shown in FIG. 4 , the faithful bedding layer 300 and the There is a difference in that a glass taping is provided between the sheath layers 400 . The bedding layer 300 and the sheath layer 400 of the embodiment shown in Fig. 3 may be configured in a continuous or extruded manner together, and the bedding layer 300 and the sheath of the three-phase power cable shown in Figs. It may be configured the same as the material constituting the layer 400 .

Table 2 below shows a comparative example of a conventional distribution-class three-phase power cable having a conductor cross-sectional area of 50 (mm ² ) and a distribution-class power cable having a conductor cross-sectional area of 50 (mm ² ) according to the present invention shown in FIG. The configuration of examples and IEC 60332-3-22 test results are shown.

As shown in the table below, the difference between the comparative examples of conventional cables and the embodiments of the power cable according to the present invention is the presence or absence of the faithful bedding layer 300 therein (the faithful bedding layer 300 surrounding the core 100). ) and the number of turns of the glass taping layer 200 of the glass taping layer 200 are different.

The solid bedding layer 300 and the sheath layer 400 of the power cable shown in FIG. 3 may be extruded together, and the thickness of only the sheath layer 400 is 2.0 millimeters (mm) to 6.0 millimeters (mm). can be configured.

Specifically, in the embodiment shown in FIG. 4 , unlike the embodiment shown in FIG. 3 , a glass taping layer formed by transversing a glass tape made of glass fibers between the bedding layer 300 and the sheath layer 400 . 200 may be further provided. In this case, the glass taping layer 200 is formed by transversely winding one to three glass tapes, and a thickness of 0.12 millimeters (mm) to 0.48 millimeters (mm). can

The glass taping layer 200 of the embodiment shown in FIG. 4 may be configured to have a smaller thickness than the glass taping layer 200 of the single-phase power cable shown in FIGS. 1 and 2 . This is presumed to be because the solid bedding layer 300 that fills the gap between the three cores 100 is provided and serves as a barrier of the core 100 against heat or flame.

That is, since the faithful bedding layer 300 has a considerable volume, unlike the bedding layer 300 shown in FIG. because it will take

And, as described in the table below, a three-phase power cable without a solid bedding layer 300, for example, three cores 100 is bound with a binding tape, and then the sheath layer 400 is extruded to form a cable. In the case of configuration, it can be confirmed that the above flame retardancy test was not passed regardless of the number of glass taping lateral windings of the glass taping layer 200 or the presence or absence of an additional taping layer.

That is, in the event of a fire, the flame destroys the sheath layer 400 and approaches the core 100 at the same time, so that the core 100 or its insulating layer 30 can be easily melted.

In addition, Examples 1 and 2 having the solid bedding layer 300 passed the flame retardant test regardless of the number of turns of the glass tape of the glass taping layer 200 . That is, in the case of a three-phase power cable, it can be estimated that the role of the faithful bedding layer 300 is greater than that of the glass taping layer 200 in order to satisfy the above flame retardant test.

Although it is not an example included in Table 2 below, it is assumed that the power cable provided with the faithful bedding layer 300 and the glass taping layer 200 satisfies the above test under the same conditions.

As such, in the case of a three-phase power cable in which the core 100 is dispersed, the faithful bedding layer 300 faithfully transfers or approaches heat or flame to each core 100 even if one side is damaged by a flame. It can be understood that the type bedding blocks to some extent to ensure flame retardancy.

Of course, it is preferable to add the glass taping layer 200 to enhance the flame retardancy regardless of whether the stable test is passed.

In this case, the glass taping layer 200 may be provided between the faithful bedding layer 300 and the sheath layer 400 , as in the above-described embodiments.

Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 conductor dong dong dong dong dong inner semiconducting layer semiconducting extrusion semiconducting extrusion semiconducting extrusion semiconducting extrusion semiconducting extrusion insulating layer XLPE XLPE XLPE XLPE XLPE
outer semiconducting layer Semi-conducting powder extrusion / semi-conducting tape 2 times horizontal winding Semi-conducting powder extrusion / semi-conducting tape 2 times horizontal winding Semi-conducting powder extrusion / semi-conducting tape 2 times horizontal winding Semi-conducting powder extrusion / semi-conducting tape 2 times horizontal winding Semi-conducting powder extrusion / semi-conducting tape 2 times horizontal winding metal shielding layer copper tape copper tape copper tape copper tape copper tape
faithful bedding layer
X
X
X PVC
(oxygen index 40%) PVC
(oxygen index 40%)
glass
taping layer
glass tape
1 time pass
Non-woven fabric 1 time horizontal winding / Glass tape 6 times horizontal winding / Non-woven fabric 1 horizontal winding
glass tape
6 laps
glass tape
3 laps
glass tape
1 time pass
sheath layer PVC
(Oxygen index 38%) PVC
(oxygen index 40%) PVC
(oxygen index 40%) PVC
(oxygen index 40%) PVC
(oxygen index 40%) IEC 60332-3-22 Category A Class
Test result
Failed (burnout)
Failed (burnout)
Failed (burnout)
pass
pass

Although the present specification has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. will be able to carry out 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.

1: power cable
100: core
200: glass taping layer
300: bed layer
400: sheath layer

Claims (17)

a core including a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer provided outside the inner semiconducting layer, an outer semiconducting layer provided outside the insulating layer, and a metal shielding layer provided outside the outer semiconducting layer;
a bedding layer provided outside the core;
a glass taping layer formed by transversing a glass tape made of glass fibers on the outside of the core; and,
and a sheath layer surrounding the core, the bedding layer, and the glass taping layer;
The bedding layer and the sheath layer have an oxygen index (LOI) of 35% to 47%, and extrude a compound of PVC, EVA, EPDM, PO, PE, CR, CPE, CSP material or a mixture containing the same, The bedding layer is 1.5 millimeters (mm) to 4.0 millimeters (mm),
the glass taping layer includes a first glass taping layer and a second glass taping layer, respectively, inside and outside the bedding layer, the thickness of the second glass taping layer being greater than the thickness of the first glass taping layer;
The thickness of the first glass taping layer is 0.20 millimeters (mm) to 0.45 millimeters (mm), and the thickness of the second glass taping layer is 0.50 millimeters (mm) to 0.85 millimeters (mm),
The power cable according to claim 1, wherein the first glass taping layer and the second glass taping layer are respectively formed by horizontally winding 2 to 3 and 4 to 6 glass tapes. delete According to claim 1,
Power cable, characterized in that the inner semiconducting layer of the core is extruded with a semiconducting compound, and the outer semiconducting layer of the core is formed by extruding with the semiconducting compound and then transversely winding the outside with a semiconducting tape. According to claim 1,
The metal shielding layer of the core is formed by winding a tape or braid made of any one of copper, copper alloy, aluminum, and aluminum alloy. According to claim 1,
The glass taping layer is provided inside the bedding layer, and the bedding layer and the sheath layer are extruded together. According to claim 1,
The insulating layer is a power cable, characterized in that it is composed of a polymer such as XLPE, XLPO, EPR, HEPR, PVC, Silicone rubber, and a mixture of the above components. delete delete According to claim 1,
The glass tape constituting the glass taping layer is at least one of a urethane-coated glass tape, a silicone-coated glass tape, and a ceramic-coated glass tape. According to claim 1,
The glass taping layer is formed by horizontally winding 6 to 9 sheets of glass tape, and the power cable, characterized in that the thickness is 0.7 millimeters (mm) to 1.3 millimeters (mm). delete delete delete delete delete delete delete

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