CN205984331U - Nuclear power medium voltage power cable - Google Patents

Abstract

The utility model relates to a nuclear power medium-voltage power cable, which comprises a wire core and a cable core made of several wire cores twisted with each other. The wire core includes several conductors twisted with each other, and the conductors are extruded sequentially from the inside to the outside. Shielding layer, insulating layer, insulating shielding layer and metal shielding layer; the gap between the cable cores is provided with a heat-insulating filling layer, and the outside of the cable core is extruded with a tape layer and an outer sheathing layer; the utility model has a simple structure and has Radiation, liquid corrosion resistance, aging resistance, long service life.

Description

Nuclear power medium voltage power cable

technical field

The utility model relates to the technical field of cables, in particular to a medium-voltage power transmission cable for nuclear power.

Background technique

Existing nuclear power cables are mainly used in third-generation nuclear power plants. The application places include inside and outside the shell, and the structure includes conductors, insulating layers, filling layers, tape layers, and outer sheathing layers. This kind of structure can ensure the normal operation of the cable during short-term use, but it will accelerate the aging of the cable and reduce the service life of the cable when it is used under long-term radiation and high temperature, and it is filled with a single layer, and the cable will burn after being subjected to long-term radiation aging , the filling is easy to become brittle and greatly reduces the flame retardant performance, which cannot guarantee the normal operation of the cable for a long time. The outer sheath is made of thermoplastic material. Although the flexibility and flexibility of the cable are improved, the laying environment contains corrosive liquids The sheath absorbs liquids easily and is prone to cracking.

Utility model content

Aiming at the above-mentioned problems in the prior art, the utility model provides a nuclear power medium-voltage power cable, which has a simple structure, radiation resistance, liquid corrosion resistance, aging resistance and long service life.

The technical scheme adopted in the utility model is as follows:

The nuclear power medium voltage power cable includes a wire core and a cable core made of several wire cores twisted with each other. The wire core includes several conductors twisted with each other. layer, insulating shielding layer and metal shielding layer; the gap between the cable cores is provided with a thermal insulation filling layer, and the outside of the cable core is extruded with a tape layer and an outer sheath;

The further technical scheme of the utility model is as follows:

Further, the conductor is an annealed soft copper conductor;

Further, the conductor shielding layer adopts semi-conductive cross-linked conductor shielding material;

Further, the insulating layer adopts high-purity cross-linked polyethylene insulating material;

Further, the insulating shielding layer adopts semi-conductive insulating shielding material;

Further, the annealed soft copper strip used in the metal shielding layer;

Further, the filling layer is a composite filling structure composed of a central filling layer and a surrounding filling layer. Oxygen layer;

Further, the tape layer 7 adopts a low-smoke, halogen-free, flame-retardant tape wrapping structure;

Further, the outer sheath of the low-smoke, halogen-free, flame-retardant polyolefin material is a halogen-free, low-smoke, flame-retardant, radiation-crosslinked polyolefin material.

The utility model has the advantages of:

1. The utility model adopts high-purity cross-linked polyethylene insulating material. After three-layer co-extrusion, the precise vulcanization time and vulcanization temperature are used to improve the insulation and heat resistance time of the cable during use.

2. The cable core of this utility model is filled with composite filling, the center of the cable core is filled with a low-smoke, halogen-free, high-flame-retardant filling layer, and the surrounding filling is filled with an extruded low-smoke, halogen-free, high-flame-retardant, oxygen-barrier layer, which not only ensures the roundness of the cable core At the same time, it ensures that the cable can be used normally for more than 60 years in a long-term radiation environment and high-temperature environment.

3. The utility model adopts a halogen-free low-smoke flame-retardant irradiation cross-linked polyolefin sheath, which solves the problem that the halogen-free flame-retardant sheath is easy to crack, and at the same time ensures the liquid corrosion resistance, wear resistance and aging resistance of the cable.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

Below in conjunction with accompanying drawing, illustrate the specific embodiment of the present utility model.

As shown in Figure 1, the utility model comprises a wire core and a cable core made of several wire cores twisted with each other, and the wire core includes several conductors 1 twisted with each other, and the conductor 1 is an annealed soft copper conductor, 1. Extrude the conductor shielding layer 2, the insulating layer 3, the insulating shielding layer 4 and the metal shielding layer 5 from the inside to the outside in sequence. The conductor shielding layer 2 adopts semi-conductive cross-linked conductor shielding material to homogenize the electric field and avoid tip discharge The role of the protective insulating layer. The insulating layer 3 is made of high-purity cross-linked polyethylene insulating material to ensure the conductivity of the product. The insulating shielding layer 4 is made of semi-conductive insulating shielding material, which can play a protective role. The metal shielding layer 5 uses The annealed soft copper strip plays the role of grounding discharge to ensure the safety of the cable grounding; the gap between the cable cores is provided with a heat-insulating filling layer 6, and the filling layer 6 is a composite filling structure composed of a central filling layer and a surrounding filling layer. The central filling layer is a low-smoke, halogen-free, high-flame-retardant filling rope, and the surrounding filling layer is a low-smoke, halogen-free, high-flame-retardant, oxygen-barrier layer, which not only ensures the roundness of the cable core, but also protects the cable from being exposed to radiation for a long time. , It can be normally used and operated for more than 60 years in a high temperature environment; the outside of the cable core is extruded with a tape layer 7 and an outer sheath layer 8, and the tape layer 7 adopts a low-smoke, halogen-free flame-retardant tape wrapping structure, which can protect the The cable core plays the role of tightening and can also be flame retardant. The outer sheath 8 is a halogen-free low-smoke flame-retardant irradiation cross-linked polyolefin material, which solves the problem that the halogen-free flame-retardant sheath is easy to crack, and at the same time ensures Liquid corrosion resistance, wear resistance and aging resistance of the cable.

The above description is an explanation of the utility model, not a limitation of the utility model. For the scope limited by the utility model, please refer to the claims. Within the protection scope of the utility model, any form of modification can be made.

Claims (9)

1. A medium-voltage power cable for nuclear power, characterized in that it includes a wire core and a cable core made of several wire cores twisted with each other, and the wire core includes several conductors (1) twisted with each other, and the conductor (1) Extrude the conductor shielding layer (2), the insulating layer (3), the insulating shielding layer (4) and the metal shielding layer (5) sequentially from the inside to the outside; the gap between the cable cores is provided with a heat-insulating filling layer (6). The outside of the cable core is extruded with a tape layer (7) and an outer sheath (8). 2. The nuclear power medium voltage power cable according to claim 1, characterized in that the conductor (1) is an annealed annealed copper conductor. 3. The nuclear power medium voltage power cable according to claim 1, characterized in that: the conductor shielding layer (2) adopts a semi-conductive cross-linked conductor shielding material. 4. The medium-voltage power cable for nuclear power plants according to claim 1, characterized in that the insulating layer (3) is made of high-purity cross-linked polyethylene insulating material. 5. The nuclear power medium voltage power cable according to claim 1, characterized in that: the insulating shielding layer (4) is made of semi-conductive insulating shielding material. 6. The nuclear power medium voltage power cable according to claim 1, characterized in that the annealed soft copper strip is used for the metal shielding layer (5). 7. The nuclear power medium voltage power cable according to claim 1, characterized in that: the filling layer (6) is a composite filling structure composed of a central filling layer and a surrounding filling layer, and the central filling layer is low-smoke, halogen-free, high Flame-retardant filling rope, the surrounding filling layer is a low-smoke, halogen-free, high flame-retardant oxygen barrier layer. 8. The medium-voltage power cable for nuclear power plants according to claim 1, characterized in that the tape layer (7) adopts a low-smoke, halogen-free, flame-retardant tape wrapping structure. 9. The medium-voltage power cable for nuclear power plants according to claim 1, characterized in that the outer sheath (8) is made of low-smoke, halogen-free, flame-retardant polyolefin material.