CN210295997U

CN210295997U - Medium-voltage fireproof power cable

Info

Publication number: CN210295997U
Application number: CN201921402312.XU
Authority: CN
Inventors: 刘海峰; 张中云; 虞踏峰; 廉果; 韩淑杰; 刘亚欣; 慕战刚; 桂裕聪
Original assignee: Jiangsu Hengtong Power Cable Co Ltd
Current assignee: Jiangsu Hengtong Power Cable Co Ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-04-10
Anticipated expiration: 2029-08-27

Abstract

The utility model discloses a medium-voltage fireproof power cable, which comprises a plurality of copper conductors, a semi-conductive conductor shielding layer, an insulating layer and a semi-conductive insulating shielding layer, the semi-conductive conductor shielding layer, the insulating layer and the semi-conductive insulating shielding layer are coated outside each copper conductor in a co-extrusion way, the outer side of the semi-conductive insulating shielding layer of each copper conductor is wrapped with a metal shielding layer, the plurality of copper conductors are wrapped to obtain a wire core, two fire-resistant wrapping layers are arranged on the outer side of the wire core, namely a first fire-resistant wrapping layer and a second fire-resistant wrapping layer, the package has the filler around packing between first fire-resistant copper conductor around covering and inside, the second is fire-resistant to locate first fire-resistant around the covering outside, and two-layer fire-resistant is equipped with the cladding around between the covering and has an oxygen layer and ceramic flame retardant coating, ceramic flame retardant coating is located and separates oxygen layer and the second is fire-resistant around between the covering. The utility model discloses have halogen-free, low cigarette, fire-retardant, nontoxic, the characteristic of preventing fires, can reach the middling pressure fire prevention level.

Description

Medium-voltage fireproof power cable

Technical Field

The utility model relates to a middling pressure fire prevention power cable belongs to the cable field.

Background

The fire protection regulations of civil buildings have required mineral insulation fireproof cables to be adopted as fire protection power distribution system cables. The main characteristic is to meet the requirement that the flame burns for more than 180min at 950 ℃ to ensure the normal operation of the line. At present, many super-high-rise and extra-high-rise buildings use 6-35 kV medium-voltage crosslinked polyethylene insulated cables for power supply, a transformer is arranged in the middle or at the top of a building floor, the medium-voltage cable is laid in a vertical shaft and connected with the transformer, and the medium-voltage cable is subjected to voltage reduction through the transformer and supplies power to related equipment. Many users propose that when a fire occurs, once a medium-voltage line in a building is in a fire short circuit, a fire-fighting line of low-voltage distribution cannot work normally due to no electricity. In order to ensure the power supply reliability under the fire condition, a user puts forward a higher fire-resistant requirement on a medium-voltage crosslinked cable with the rated voltage of 6-35 kV, and the crosslinked cable is required to have the same fire-resistant grade as a mineral insulation fireproof cable in a period of time under the flame condition, namely the fire-resistant grade of 950 ℃/180 min. In order to ensure that a small amount of smoke is generated during cable combustion and no halogen is contained in the smoke, a low-smoke halogen-free flame-retardant fireproof medium-voltage cable is needed.

Disclosure of Invention

The utility model aims at providing a middling pressure fire prevention power cable, this middling pressure fire prevention power cable have do not have steamed, low cigarette, fire-retardant, nontoxic, the characteristic of fire prevention, can reach middling pressure fire prevention level, burn 180min under 950 ℃ of flame condition promptly and can not damage, and the cable still can normally supply power.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a medium-voltage fireproof power cable comprises a plurality of copper conductors, a semi-conductive conductor shielding layer, an insulating layer and a semi-conductive insulating shielding layer, the semi-conductive conductor shielding layer, the insulating layer and the semi-conductive insulating shielding layer are coated outside each copper conductor in a co-extrusion way, the outer side of the semi-conductive insulating shielding layer of each copper conductor is wrapped with a metal shielding layer, the plurality of copper conductors are wrapped to obtain a wire core, two fire-resistant wrapping layers are arranged on the outer side of the wire core, namely a first fire-resistant wrapping layer and a second fire-resistant wrapping layer, the filler is filled between the first fire-resistant wrapping layer and the copper conductor inside, the second fire-resistant wrapping layer is arranged outside the first fire-resistant wrapping layer, an oxygen isolating layer and a ceramic fire-resistant layer are arranged between the two fire-resistant wrapping layers, the pottery flame retardant coating is located between oxygen layer and the fire-resistant package covering of second, the fire-resistant package covering outside of second has the outer jacket.

The further improved scheme in the technical scheme is as follows:

1. in the above scheme, the copper conductor is an annealed copper conductor without a metal layer.

2. In the above scheme, the insulating layer is a crosslinked polyethylene insulating layer.

3. In the scheme, the metal shielding layer is soft copper belts lapped and wrapped on the outer side of the semi-conductive insulating shielding layer in an overlapping mode, and the average overlapping rate of the soft copper belts is larger than or equal to 15%.

4. In the above scheme, the filler is a glass fiber filling rope.

5. In the scheme, the oxygen-isolating layer is a halogen-free oxygen-isolating layer with the oxygen index not less than 50.

6. In the above scheme, first fire-resistant covering and the fire-resistant covering of second are alkali-free glass fiber around the band.

7. In the above scheme, the outer protective layer is a halogen-free polyolefin sheath material.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:

the utility model discloses middling pressure fire prevention power cable, it adopts fire-resistant filler, first fire-resistant wrapping layer, oxygen barrier, pottery fire-resistant coating and the fire-resistant cladding structure of second wrapping layer, makes the cable have and does not have steamed, low cigarette, fire-retardant, nontoxic, the fire-proof characteristic, can reach middling pressure fire prevention level, burns 180 minutes under 950 ℃ flame condition and can not damage, and the cable still can normally supply power, can lay in indoor or outdoor, underground, cable testing bridge, cable pit etc.; further, separate the cooperation of oxygen layer and ceramic flame retardant coating, can separate external heat when the cable burning, the cable core of protection inlayer does not receive destruction, and fire-resistant setting around the covering can prevent to produce the drippage in the cable burning process simultaneously.

Drawings

Figure 1 is the utility model discloses middling pressure fire prevention power cable structure sketch map.

In the above drawings: 1. a copper conductor; 2. a semiconductive conductor shield layer; 3. an insulating layer; 4. a semiconductive insulating shield layer; 5. a metal shielding layer; 6. a filler; 7. a first fire-resistant wrapping layer; 8. an oxygen barrier layer; 9. ceramic refractory layer; 10. a second fire-resistant wrapping layer; 11. an outer jacket.

Detailed Description

In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.

Example 1: a medium-voltage fireproof power cable comprises a plurality of copper conductors 1, a semiconductive conductor shielding layer 2, an insulating layer 3 and a semiconductive insulation shielding layer 4, wherein the semiconductive conductor shielding layer 2, the insulating layer 3 and the semiconductive insulation shielding layer 4 are coated outside each copper conductor 1 in a co-extrusion manner, a metal shielding layer 5 is coated outside each semiconductive insulation shielding layer 4 of each copper conductor 1, the plurality of copper conductors 1 are wrapped to obtain a wire core, two layers of fireproof wrapping layers are arranged outside each wire core, namely a first fireproof wrapping layer 7 and a second fireproof wrapping layer 10 are respectively arranged outside each wire core, a filler 6 is filled between each first fireproof wrapping layer 7 and the inner copper conductor 1, each second fireproof wrapping layer 10 is arranged outside each first fireproof wrapping layer 7, an oxygen isolating layer 8 and a ceramic fireproof layer 9 are arranged between the two layers of fireproof wrapping layers, the ceramic fireproof layer 9 is located between each oxygen isolating layer 8 and each second fireproof layer 10, the fire-resistant cladding of second has outer jacket 11 around covering 10 outside.

The insulating layer 3 is a crosslinked polyethylene insulating layer.

The metal shielding layer 5 is a soft copper belt lapped outside the semi-conductive insulating shielding layer 4 in an overlapping way, and the average lapping rate among the soft copper belts is 15%.

The filler 6 is a glass fiber filler rope.

The oxygen barrier layer 8 is a halogen-free oxygen barrier layer with an oxygen index of 58.

The first fire-resistant wrapping layer 7 and the second fire-resistant wrapping layer 10 are alkali-free glass fiber wrapping tapes.

The outer protective layer 11 is a halogen-free polyolefin sheath material.

Example 2: a medium-voltage fireproof power cable comprises a plurality of copper conductors 1, a semiconductive conductor shielding layer 2, an insulating layer 3 and a semiconductive insulation shielding layer 4, wherein the semiconductive conductor shielding layer 2, the insulating layer 3 and the semiconductive insulation shielding layer 4 are coated outside each copper conductor 1 in a co-extrusion manner, a metal shielding layer 5 is coated outside each semiconductive insulation shielding layer 4 of each copper conductor 1, the plurality of copper conductors 1 are wrapped to obtain a wire core, two layers of fireproof wrapping layers are arranged outside each wire core, namely a first fireproof wrapping layer 7 and a second fireproof wrapping layer 10 are respectively arranged outside each wire core, a filler 6 is filled between each first fireproof wrapping layer 7 and the inner copper conductor 1, each second fireproof wrapping layer 10 is arranged outside each first fireproof wrapping layer 7, an oxygen isolating layer 8 and a ceramic fireproof layer 9 are arranged between the two layers of fireproof wrapping layers, the ceramic fireproof layer 9 is located between each oxygen isolating layer 8 and each second fireproof layer 10, the fire-resistant cladding of second has outer jacket 11 around covering 10 outside.

The copper conductor 1 is an annealed copper conductor without a metal layer.

The metal shielding layer 5 is a soft copper belt lapped outside the semi-conductive insulating shielding layer 4 in an overlapping way, and the average lapping rate among the soft copper belts is 20%.

The filler 6 is a glass fiber filler rope.

The oxygen barrier layer 8 is a halogen-free oxygen barrier layer with an oxygen index of 52.

The outer protective layer 11 is a halogen-free polyolefin sheath material.

When the medium-voltage fireproof power cable is adopted, the coating structure of the fireproof filler, the first fireproof wrapping layer, the oxygen isolation layer, the ceramic fireproof layer and the second fireproof wrapping layer is adopted, so that the cable has the characteristics of no halogen, low smoke, flame retardance, no toxicity and fire resistance, and can reach the medium-voltage fireproof grade, namely the cable cannot be damaged after being burnt for 180min under the condition of 950 ℃ flame, can still normally supply power and can be laid in indoor or outdoor, underground, cable bridges, cable trenches and other positions; further, separate the cooperation of oxygen layer and ceramic flame retardant coating, can separate external heat when the cable burning, the cable core of protection inlayer does not receive destruction, and fire-resistant setting around the covering can prevent to produce the drippage in the cable burning process simultaneously.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A medium voltage fireproof power cable is characterized in that: the novel copper-clad cable comprises a plurality of copper conductors (1), a semiconductive conductor shielding layer (2), an insulating layer (3) and a semiconductive insulation shielding layer (4), wherein three layers of the semiconductive conductor shielding layer (2), the insulating layer (3) and the semiconductive insulation shielding layer (4) are coated outside each copper conductor (1) in a co-extrusion mode, a metal shielding layer (5) is coated outside each semiconductive insulation shielding layer (4) of each copper conductor (1), the plurality of copper conductors (1) are wrapped to obtain a cable core, two layers of fire-resistant wrapping layers are arranged outside the cable core, a first fire-resistant wrapping layer (7) and a second fire-resistant wrapping layer (10) are respectively arranged, a filler (6) is filled between the first fire-resistant wrapping layer (7) and the inner copper conductor (1), the second fire-resistant wrapping layer (10) is arranged outside the first fire-resistant wrapping layer (7), an oxygen isolating layer (8) and a ceramic fire-resistant layer (9) are arranged between the two layers, pottery flame retardant coating (9) are located between oxygen layer (8) and the fire-resistant package of covering (10) of second, the fire-resistant package of covering (10) outside of second has outer jacket (11).

2. A medium voltage fireproof power cable according to claim 1, wherein: the copper conductor (1) is an annealed copper conductor without a metal layer.

3. A medium voltage fireproof power cable according to claim 1, wherein: the insulating layer (3) is a cross-linked polyethylene insulating layer.

4. A medium voltage fireproof power cable according to claim 1, wherein: the metal shielding layer (5) is a soft copper belt which is lapped and wrapped on the outer side of the semi-conductive insulating shielding layer (4) in an overlapping mode, and the average lapping rate among the soft copper belts is larger than or equal to 15%.

5. A medium voltage fireproof power cable according to claim 1, wherein: the filler (6) is a glass fiber filling rope.

6. A medium voltage fireproof power cable according to claim 1, wherein: the oxygen insulation layer (8) is a halogen-free oxygen insulation layer with the oxygen index not less than 50.

7. A medium voltage fireproof power cable according to claim 1, wherein: the first fire-resistant wrapping layer (7) and the second fire-resistant wrapping layer (10) are alkali-free glass fiber wrapping tapes.

8. A medium voltage fireproof power cable according to claim 1, wherein: the outer protective layer (11) is a halogen-free polyolefin sheath material.