Novel conductor corrosion-resistant direct-current cable

Abstract

The utility model discloses a novel conductor corrosion-resistant type DC cable, comprising a plurality of composite graphene conductors, an insulating layer, a water-blocking tape, an oxygen barrier layer and an outer sheath which are successively arranged from inside to outside, each composite graphene conductor comprises a metal conductor and a graphene coating wrapping the outer surface of the metal conductor, the metal conductor adopts a category 5 flexible conductor, and the outer surface of the metal conductor is coated with the graphene coating. The plurality of composite graphene conductors are stranded and then wrapped by the insulating layer, the insulating layer adopts an ethylene propylene rubber insulating layer or a crosslinked polyethylene insulating layer, the oxygen barrier layer adopts a low-smoke halogen-free oxygen barrier layer, the outer sheath adopts a low-smoke halogen-free flame-retardant polyolefin sheath, the metal conductor adopts a copper wire or an aluminum wire in a category 5 flexible conductor, and the water-blocking tape adopts a water-absorbent resin water-blocking tape. And an armor layer is arranged between the oxygen barrier layer and the outer sheath. According to the utility model, the corrosion resistance, oxidation resistance and conductivity of the DC cable are improved, the failure rate is reduced, and the safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the field of power cables, in particular to a new type of conductor corrosion-resistant DC cable. Background Art

[0002] At present, although DC cables on the market have been widely used in urban rail transit, DC power cables refer to low-voltage positive cables, connecting cables, and negative cables with voltages of 1500V and below 1500V that directly supply power to traction locomotives in subway and light rail power supply systems. This cable is responsible for delivering qualified electrical energy to the overhead lines along the track. Ethylene propylene rubber insulated DC cables will become the main products in subway DC cables. As an important medium for DC power transmission in rail transit, their usage will account for 50% of the total rail transit cable usage, and the market prospect is very broad. However, higher requirements are also put forward for their safety. At present, there are still some challenges in improving the safety of cables. For example, the corrosion and oxidation problems of conductors will affect the life and performance of cables. In addition, the conductivity of conductors is also one of the key factors affecting cable efficiency. Although traditional tinned conductors have certain corrosion resistance and conductivity, under some extreme conditions, their performance cannot meet the requirements of high-demand application environments. Once the power is interrupted, it will disrupt the transportation plan and the operation of rolling stock, affect the operation of the environmental control system of urban rail transit, and cause great social impact. Improving the safety, reliability, and service life of cables has become the main research direction for cable performance improvement, and it is also of great significance for improving cable safety and reducing failure rates. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, improve the corrosion resistance, oxidation resistance, and conductivity of DC cables, reduce failure rates, and enhance safety performance, and provide a new type of conductor corrosion-resistant DC cable.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A new type of conductor corrosion-resistant DC cable includes a composite graphene conductor, an insulating layer, a water-blocking tape, an oxygen barrier layer, and an outer sheath arranged in sequence from the inside to the outside. There are multiple composite graphene conductors, and each composite graphene conductor includes a metal conductor and a graphene coating wrapped on the outer surface of the metal conductor. After being stranded, the multiple composite graphene conductors are wrapped by the insulating layer.

[0006] The DC cable of the present utility model improves the safety performance of traditional DC cables. The composite graphene conductor improves the corrosion resistance by setting a graphene coating on the surface of the metal conductor, which can enhance the anti-corrosion performance, effectively reduce the impact of the copper conductor aging test, and improve the antioxidant capacity and conductivity of the cable. By stranding the composite graphene conductor, the burrs and powder generated during the processing of the stranded conductor causing tip discharge and uneven electric field distribution at each point on the surface of the wire core are solved. The flame retardant performance and stability of the cable are ensured by sequentially setting an insulating layer, a water blocking tape, an oxygen barrier layer, and an outer sheath.

[0007] To improve the flame retardant performance of the cable, the insulating layer is made of ethylene propylene rubber insulating layer or cross-linked polyethylene insulating layer.

[0008] To improve the flame retardant performance of the cable, the oxygen barrier layer is made of low-smoke and halogen-free oxygen barrier layer. The outer sheath is made of low-smoke and halogen-free flame retardant polyolefin sheath.

[0009] Preferably, the metal conductor is a Class 5 flexible conductor.

[0010] Preferably, the metal conductor is copper wire or aluminum wire in a Class 5 flexible conductor.

[0011] Preferably, the water blocking tape is a water-absorbing resin water blocking tape.

[0012] To protect the cable from external mechanical forces, an armor layer is also provided between the oxygen barrier layer and the outer sheath.

[0013] The present utility model uses a composite graphene conductor to improve the conductivity of the DC cable, which can significantly reduce the resistance loss, improve the power transmission efficiency, and at the same time improve the corrosion resistance and antioxidant property of the DC cable, and can effectively protect the conductor from the influence of the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following further describes the present utility model in detail with reference to the drawings.

[0015] Figure 1 is a schematic structural diagram of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the composite graphene conductor of the present utility model;

[0017] Figure 3 is a schematic structural diagram of the stranded composite graphene conductor of the present utility model;

[0018] Figure 4 is a schematic structural diagram of the present utility model with an armor layer;

[0019] Explanation of the reference numerals: 1-composite graphene conductor; 101-metal conductor; 102-graphene coating; 2-insulating layer; 3-water blocking tape; 4-oxygen barrier layer; 5-outer sheath; 6-armor layer. DETAILED DESCRIPTION

[0020] like Figures 1-3 As shown, the utility model provides a novel conductor corrosion-resistant DC cable, comprising a composite graphene conductor 1, an insulating layer 2, a water-blocking tape 3, an oxygen-isolating layer 4, and an outer sheath 5 arranged in sequence from the inside to the outside, wherein the composite graphene conductor 1 has a plurality of composite graphene conductors 1, the composite graphene conductor 1 comprising a metal conductor 101 and a graphene coating 102 wrapped around the outer surface of the metal conductor 101, and the plurality of composite graphene conductors 1 are twisted and wrapped by the insulating layer 2.

[0021] The DC cable of the utility model improves the safety performance of the traditional DC cable. Since the graphene material has extremely high corrosion resistance and oxidation resistance, and also has extremely high conductivity, the composite graphene conductor 1 is provided with a graphene coating 102 on the surface of the metal conductor 101 to improve the corrosion resistance, which can improve the corrosion resistance, effectively reduce the influence of the aging test of the copper conductor, and improve the oxidation resistance and conductivity of the cable. By twisting the composite graphene conductor 1, the burrs and dust generated by the processing of the twisted conductor cause the tip discharge and the uneven electric field distribution at each point on the core surface. By sequentially arranging the insulating layer 2, the water blocking tape 3, the oxygen barrier layer 4 and the outer sheath 5, the flame retardant performance and stability of the cable are ensured.

[0022] In order to improve the flame retardant performance of the cable, the insulating layer 2 is made of ethylene propylene rubber insulating layer or cross-linked polyethylene insulating layer.

[0023] In order to improve the flame retardant performance of the cable, the oxygen-isolating layer 4 is a low-smoke, halogen-free oxygen-isolating layer, and the outer sheath 5 is a low-smoke, halogen-free, flame-retardant polyolefin sheath.

[0024] In this embodiment, the metal conductor 101 uses a Class 5 soft conductor, such as copper wire or aluminum wire.

[0025] In this embodiment, the water blocking tape 3 is made of a water absorbing resin.

[0026] like Figure 4 As shown, in order to protect the cable from external mechanical forces, an armor layer 6 is further provided between the oxygen-isolating layer 4 and the outer sheath 5 .

[0027] The utility model adopts a composite graphene conductor 1 to improve the conductivity of the DC cable, which can significantly reduce resistance loss and improve power transmission efficiency. At the same time, it improves the corrosion resistance and oxidation resistance of the DC cable and can effectively protect the conductor from the influence of the external environment.

[0028] The DC cable of the present utility model meets the requirements of GB / T28429-2012. The use of ethylene propylene rubber insulation layer 2, oxygen barrier layer 4, and low-smoke non-flammable polyolefin sheath with high-quality materials meets the A+B1 class flame retardant performance of the DC cable, achieving triple optimization of corrosion resistance, oxidation resistance, and high conductivity. At the same time, through the structure of arranging multiple stranded composite graphene conductors 1, insulation layer 2, water blocking tape 3, oxygen barrier layer 4, and outer sheath 5 from the inside out, the performance of the DC cable can greatly meet the needs of modern power transmission, especially performing excellently in harsh working environments.

[0029] The above is only the preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope defined by the claims.

Claims

1. A new type of corrosion-resistant DC cable with conductor, characterized in that: It includes a composite graphene conductor, an insulating layer, a water-blocking tape, an oxygen-isolating layer, and an outer sheath which are sequentially arranged from the inside to the outside. There are multiple composite graphene conductors, and the composite graphene conductors include a metal conductor and a graphene coating wrapped around the outer surface of the metal conductor. The multiple composite graphene conductors are twisted and wrapped by an insulating layer.

2. The novel conductor corrosion-resistant DC cable according to claim 1 is characterized in that: The insulation layer is made of ethylene propylene rubber insulation layer or cross-linked polyethylene insulation layer.

3. The novel conductor corrosion-resistant DC cable according to claim 1 is characterized in that: The oxygen-isolating layer is a low-smoke, halogen-free oxygen-isolating layer.

4. The novel conductor corrosion-resistant DC cable according to claim 1 is characterized in that: The outer sheath is a low-smoke, halogen-free, flame-retardant polyolefin sheath.

5. The novel conductor corrosion-resistant DC cable according to claim 1 is characterized in that: The water blocking tape is a water absorbing resin water blocking tape.

6. The novel conductor corrosion-resistant DC cable according to claim 1 is characterized in that: An armor layer is also arranged between the oxygen-isolating layer and the outer sheath.

7. The novel conductor corrosion-resistant DC cable according to claim 1 is characterized in that: The metal conductor adopts 5 types of soft conductors.

8. The novel conductor corrosion-resistant DC cable according to claim 7 is characterized in that: The metal conductor is copper wire or aluminum wire among five types of soft conductors.

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