CN218447304U

CN218447304U - Cross-linked polyethylene insulated cable for railway

Info

Publication number: CN218447304U
Application number: CN202222940059.1U
Authority: CN
Inventors: 李焕婷; 李智强; 李智棣; 李敏婷; 林锦辉
Original assignee: Guangdong Zhonglian Cable Group Co ltd
Current assignee: Guangdong Zhonglian Cable Group Co ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-02-03
Anticipated expiration: 2032-11-04

Abstract

The utility model relates to a railway insulated cable technical field specifically is a railway is with crosslinked polyethylene insulated cable, including the oversheath layer, the inner wall fixedly connected with armor of oversheath layer, the inner wall fixedly connected with isolation layer of armor. This railway is with crosslinked polyethylene insulated cable, insulating eccentricity is little in the use, insulated cable breakdown strength is high, the oversheath layer comprises low pressure low halogen polyvinyl chloride or no halogen low smoke polyolefin sheath material, the armor comprises non-magnetic metal silk material, insulating eccentricity is little (within 15%), there is not detectable office under 5pC or more excellent sensitivity put, the problem that the insulating eccentricity is big in the use of current insulated cable has been solved, the isolation layer comprises low pressure low halogen polyvinyl chloride or no halogen low smoke polyolefin sheath material, the metallic shield layer comprises the copper strips material, breakdown strength is high, breakdown strength can reach 50-70kV/mm, the problem that existing insulated cable breakdown strength is low has been solved.

Description

Cross-linked polyethylene insulated cable for railway

Technical Field

The utility model relates to a railway insulated cable technical field specifically is a railway is with crosslinked polyethylene insulated cable.

Background

The cross-linked cable is a short-form cross-linked polyethylene insulated cable, and is suitable for power frequency AC voltage 500KV and below transmission and distribution lines, the majority of high-voltage cables are insulated by cross-linked polyethylene, the cable is usually a rope-like cable formed by twisting several or several groups of wires, each group of wires are insulated with each other and usually twisted around a center, the whole cable is wrapped by a highly-insulated covering layer, and the cable has the characteristics of internal electrification and external insulation.

The existing crosslinked polyethylene insulated cable on the market has large insulation eccentricity in the use process, and has no detectable partial discharge under the sensitivity of 5pC or more; 2. the existing insulated cable has low breakdown strength to current in the using process, is easy to be broken down by strong current in the daily using process, and has large loss of an insulating medium; 3. the existing cable core is easy to generate high temperature in the long-term use process, so that the current-carrying capacity is smaller; 4. the existing insulated cable is easy to generate eddy current loss during operation, and the current-carrying capacity of the cable is inconvenient to ensure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a cross-linked polyethylene insulated cable for railway to it is big to provide the insulating eccentricity in the use in solving above-mentioned background art, and the breakdown strength is low, produces high temperature easily, leads to the current-carrying capacity to be littleer, produces eddy current loss's problem easily when the operation. In order to achieve the above object, the utility model provides a following technical scheme: a cross-linked polyethylene insulated cable for railways comprises an outer sheath layer, wherein the inner wall of the outer sheath layer is fixedly connected with an armor layer, and the inner wall of the armor layer is fixedly connected with an isolation layer;

the inner wall fixedly connected with metal shielding layer of isolation layer, the inner wall fixedly connected with insulation shielding layer of metal shielding layer, the inner wall fixedly connected with insulating layer of affiliated insulation shielding layer, the inner wall fixedly connected with conductor shielding layer of insulating layer, the inner wall fixedly connected with conductor body of conductor shielding layer.

Preferably, the outer sheath layer is made of low-pressure low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, and the armor layer is made of nonmagnetic metal wire material.

Preferably, the isolation layer is made of low-pressure low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, and the metal shielding layer is made of copper strip material.

Preferably, the insulation shielding layer is made of an environment-friendly PVC cable material.

Preferably, the insulating layer is made of cross-linked polyethylene, and the insulating layer and the insulating shielding layer are arranged in a nested connection mode.

Preferably, the conductor shielding layer is formed by compounding PVC and an aluminized glass fiber layer, and the conductor shielding layer and the conductor body are arranged in a nested connection mode.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses in, the oversheath layer comprises low pressure low halogen polyvinyl chloride or the low smoke polyolefin sheath material of nothing, and the armor comprises non-magnetic metal silk material, and insulating eccentricity is little (within 15%), does not have the office that can detect under 5pC or more excellent sensitivity and puts, has solved the big problem of insulating eccentricity of existing insulated cable in the use.

The utility model discloses in, the isolation layer comprises low-pressure low halogen polyvinyl chloride or the low cigarette polyolefin sheath material of nothing halogen, and the metallic shield layer comprises the copper strips material, and breakdown strength is high, and breakdown strength can reach 50-70kV/mm, has solved the problem that the anti breakdown strength of existing insulated cable is low.

In the utility model, the insulation shielding layer is made of environment-friendly PVC cable material, and the loss of the insulation medium is small; the insulating layer is made of cross-linked polyethylene, the insulating layer and the insulating shielding layer are arranged in a nested connection mode, the cable core is allowed to have high long-term working temperature (the maximum temperature is 90 ℃), the shutoff flow is large, the short circuit temperature (the maximum temperature lasts for 5S) is 250 ℃, and the problem that the existing insulating cable is easy to generate high temperature and the current-carrying capacity is small is solved.

The utility model discloses in, the conductor shielding layer adopts PVC and the fine layer complex of aluminizing glass to constitute, chooses for use non-magnetic metal silk armor, does not produce the eddy current loss during the operation, ensures the cable current-carrying capacity, has solved the problem that current-carrying cable produced the eddy current loss easily during the operation.

Drawings

FIG. 1 is a front view of the present invention;

fig. 2 is a side view of the structure of the present invention;

fig. 3 is an enlarged schematic structural diagram of a point a in fig. 2 of the present invention.

In the figure: 1. an outer jacket layer; 2. an armor layer; 3. an isolation layer; 4. a metal shielding layer; 5. an insulating shield layer; 6. an insulating layer; 7. a conductor shield layer; 8. a conductor body.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the staff with ordinary skill in the art without creative work all belong to the protection scope of the present invention.

Referring to fig. 1 to 3, the present invention provides a technical solution: a cross-linked polyethylene insulated cable for railways comprises an outer sheath layer 1, wherein the inner wall of the outer sheath layer 1 is fixedly connected with an armor layer 2, and the inner wall of the armor layer 2 is fixedly connected with an isolation layer 3;

the inner wall of the isolation layer 3 is fixedly connected with a metal shielding layer 4, the inner wall of the metal shielding layer 4 is fixedly connected with an insulating shielding layer 5, the inner wall of the insulating shielding layer 5 is fixedly connected with an insulating layer 6, the inner wall of the insulating layer 6 is fixedly connected with a conductor shielding layer 7, the inner wall of the conductor shielding layer 7 is fixedly connected with a conductor body 8, the outer sheath layer is made of low-pressure low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, the armor layer is made of nonmagnetic metal wire material, the insulation eccentricity is small (within 15 percent), and no detectable partial discharge exists under the sensitivity of 5pC or better; the isolation layer is made of low-voltage low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, the metal shielding layer is made of copper strip material, the breakdown strength is high, and the breakdown strength can reach 50-70kV/mm; the insulating shielding layer is made of environment-friendly PVC cable material, and the loss of insulating medium is small; the insulating layer is made of cross-linked polyethylene, the insulating layer and the insulating shielding layer are arranged in a nested connection mode, the cable core is allowed to have high long-term working temperature (the maximum temperature is 90 ℃), the shutoff volume is large, and the short circuit temperature (the maximum temperature lasts 5S) is 250 ℃; the conductor shielding layer is formed by compounding PVC and an aluminized glass fiber layer, and is armored by using nonmagnetic metal wires, so that eddy current loss is not generated during operation, and the current-carrying capacity of the cable is ensured.

In the embodiment, as shown in fig. 1, fig. 2, and fig. 3, the outer sheath layer 1 is made of a low-voltage low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, and the armor layer 2 is made of a non-magnetic metal wire material, so that the insulation eccentricity is small (within 15%), and no detectable partial discharge exists at a sensitivity of 5pC or more.

In this embodiment, as shown in fig. 1, fig. 2, and fig. 3, the isolation layer 3 is made of low-voltage low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, and the metal shielding layer 4 is made of copper strip material, so that the breakdown strength is high and can reach 50-70kV/mm.

In this embodiment, as shown in fig. 1, 2, and 3, the insulating shielding layer 5 is made of an environment-friendly PVC cable material, and the loss of the insulating medium is small.

In this embodiment, as shown in fig. 1, 2, and 3, the insulating layer 6 is made of cross-linked polyethylene, the insulating layer 6 and the insulating shielding layer 5 are nested, the cable core allows a long-term working temperature (up to 90 ℃), a large amount of current interception, and a short circuit (longest duration of 5S) temperature of 250 ℃.

In this embodiment, as shown in fig. 1, 2, and 3, the conductor shielding layer 7 is formed by compounding PVC and an aluminized glass fiber layer, and the conductor shielding layer 7 and the conductor body 8 are nested and connected, so that eddy current loss is not generated during operation, and the current-carrying capacity of the cable is ensured.

The utility model discloses a use method and advantage: when the cross-linked polyethylene insulated cable for the railway works, the working process is as follows:

as shown in fig. 1, 2 and 3, when the cross-linked polyethylene insulated cable for railways is used, the outer sheath layer is made of low-pressure low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, the armor layer is made of nonmagnetic metal wire material, the insulation eccentricity is small (within 15 percent), and no detectable partial discharge exists under the sensitivity of 5pC or more; the isolation layer is made of low-voltage low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, the metal shielding layer is made of copper strip material, the breakdown strength is high, and the breakdown strength can reach 50-70kV/mm; the insulating shielding layer is made of environment-friendly PVC cable material, and the loss of insulating medium is small; the insulating layer is made of crosslinked polyethylene, the insulating layer and the insulating shielding layer are arranged in a nested connection mode, the long-term working temperature of a cable core is allowed to be high (the maximum temperature is 90 ℃), the shutoff quantity is large, and the short circuit temperature (the maximum temperature lasts for 5S) is 250 ℃; the conductor shielding layer is formed by compounding PVC and an aluminized glass fiber layer, and is armored by using nonmagnetic metal wires, so that eddy current loss is not generated during operation, and the current-carrying capacity of the cable is ensured.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. The skilled worker in this industry should understand that the present invention is not limited by the above embodiments, and what is described in the above embodiments and the specification is only the preferred embodiments of the present invention, and does not limit the present invention, without departing from the spirit and scope of the present invention, the present invention can also have various changes and improvements, and these changes and improvements all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A cross-linked polyethylene insulated cable for railway comprises an outer sheath layer (1), and is characterized in that: the inner wall of the outer sheath layer (1) is fixedly connected with an armor layer (2), and the inner wall of the armor layer (2) is fixedly connected with an isolation layer (3);

the inner wall fixedly connected with metal shielding layer (4) of isolation layer (3), the inner wall fixedly connected with insulation shielding layer (5) of metal shielding layer (4), the inner wall fixedly connected with insulating layer (6) of affiliated insulation shielding layer (5), the inner wall fixedly connected with conductor shielding layer (7) of insulating layer (6), the inner wall fixedly connected with conductor body (8) of conductor shielding layer (7).

2. The cross-linked polyethylene insulated cable for railway according to claim 1, wherein: the outer sheath layer (1) is made of low-pressure low-halogen polyvinyl chloride or halogen-free low-smoke polyolefin sheath material, and the armor layer (2) is made of nonmagnetic metal wire material.

3. The cross-linked polyethylene insulated cable for railway according to claim 1, wherein: isolation layer (3) comprise low pressure low halogen polyvinyl chloride or no halogen low smoke polyolefin sheath material, metal-shielding layer (4) comprise the copper strips material.

4. The cross-linked polyethylene insulated cable for railways according to claim 1, characterized in that: the insulation shielding layer (5) is made of environment-friendly PVC cable materials.

5. The cross-linked polyethylene insulated cable for railway according to claim 1, wherein: the insulating layer (6) is made of cross-linked polyethylene, and the insulating layer (6) and the insulating shielding layer (5) are arranged in a nested connection mode.

6. The cross-linked polyethylene insulated cable for railways according to claim 1, characterized in that: the conductor shielding layer (7) is formed by compounding a PVC (polyvinyl chloride) layer and an aluminized glass fiber layer, and the conductor shielding layer (7) and the conductor body (8) are arranged in a nested connection mode.