CN215895996U

CN215895996U - 1E-grade flame-retardant B1 cable for nuclear power station

Info

Publication number: CN215895996U
Application number: CN202121650778.9U
Authority: CN
Inventors: 林霖; 蒋建忠; 邵冰
Original assignee: Yangzhou Shuguang Cable Co Ltd
Current assignee: Yangzhou Shuguang Cable Co Ltd
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-02-22
Anticipated expiration: 2031-07-20

Abstract

The utility model discloses a 1E-grade flame-retardant B1 cable for a nuclear power station, which belongs to the technical field of power transmission and comprises a cable core, a cable core and a cable core, wherein the cable core comprises a plurality of insulating wire cores and a filling layer; the belting layer is sleeved on the outer wall of the cable core; the outer protection layer is sleeved on the outer wall of the belting layer and is suitable for cables for the nuclear power station, and the cables are mainly applied to the inside or outside of a nuclear reactor shell, a nuclear reactor plant, a nuclear auxiliary plant and a steam turbine plant; the special inherent working environment of the nuclear power station requires that the cable used by the nuclear power station has power transmission with the requirements of low smoke, no toxicity, no corrosion, radiation resistance, high flame retardance, long service life and the like.

Description

1E-grade flame-retardant B1 cable for nuclear power station

Technical Field

The utility model relates to the technical field of power transmission, in particular to a 1E-grade flame-retardant B1 cable for a nuclear power station.

Background

The inherent working environment of the nuclear power station is quite special, and the high-reliability operation of the system is very important; the reactor is required to be stopped emergently, containment isolation is carried out, reactor core emergency cooling is carried out, residual heat of the reactor is led out, heat of a reactor shell is led out, and the functions of preventing radioactive substances from being discharged to the surrounding environment and the like are safe and reliable.

The cable for the nuclear power station is mainly applied to the inside or outside of a nuclear reactor shell, a nuclear reactor plant, a nuclear auxiliary plant and a steam turbine plant; the special inherent working environment of the nuclear power station requires that the cable has the requirements of low smoke, no toxicity, no corrosion, radiation resistance, high flame retardance, long service life and the like. The cable for the conventional nuclear power station only has common flame retardant performance, but the cable does not have the combustion performance of heat release, smoke generation condition, smoke density, vertical spreading, combustion dripping/particle grade, smoke toxicity grade, corrosiveness and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a 1E-grade flame-retardant B1 cable for a nuclear power station, which solves the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: A1E-grade flame-retardant B1 cable for a nuclear power station comprises,

the cable core comprises a plurality of insulating wire cores and a filling layer;

the belting layer is sleeved on the outer wall of the cable core; and the number of the first and second groups,

the outer protective layer is sleeved on the outer wall of the belting layer.

Preferably, the insulated wire core consists of an insulating layer and a conductor, and the insulating layer is sleeved on the outer wall of the conductor.

Preferably, the insulating layer comprises an inner insulating layer and an outer insulating layer which are arranged in sequence from inside to outside.

Preferably, the filling layer is a filling rope, and the filling rope is an inorganic filling rope.

Preferably, the outer protective layer is formed by double-layer co-extrusion and irradiation crosslinking of an outer protective layer and an oxygen isolation layer.

Preferably, the inner wall of the outer sheath and the outer wall of the oxygen isolation layer are uniformly provided with grooves, the inner wall of the outer sheath is uniformly provided with holes, and the inner cavity of each hole is provided with a reinforcing core.

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

1. the cable is suitable for being mainly applied to nuclear reactor shells or the outside of the nuclear reactor shells, nuclear reactor plants, nuclear auxiliary plants and steam turbine plants; the special inherent working environment of the nuclear power station requires that the cable has power transmission with the requirements of low smoke, no toxicity, no corrosion, radiation resistance, high flame retardance, long service life and the like;

2. the composite material has the advantages of compact structure, small outer diameter, low smoke, no toxicity, no corrosion, radiation resistance, high flame retardance, long service life and the like;

3. can be laid through pipelines or wire chases.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

In the figure: 1. a conductor; 2. an insulating layer; 201. an inner insulating layer; 202. an outer insulating layer; 3. a filling layer; 4. a cable core; 5. a belting layer; 6. an outer jacket; 601. an outer sheath; 602. an oxygen barrier layer; 7. grooving; 8. and (6) reinforcing the core.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model provides a technical scheme that: a 1E-grade flame-retardant B1 cable for a nuclear power plant, referring to fig. 1, comprising,

the cable core 4 comprises a plurality of insulating wire cores and a filling layer 3, wherein the insulating wire cores are 3+1 cores, the number of the insulating wire cores and the cross section of a conductor can be adjusted to meet the requirements of a power transmission mode and current capacity of a user when the cable core is used, the cross section of a main wire core conductor is 35mm2, the cross section of a neutral wire core conductor is 16mm2, and the outer diameter of the cable core is 19.0 mm;

the belting layer 5 is sleeved on the outer wall of the cable core 4; and the number of the first and second groups,

the outer protective layer 6 is sleeved on the outer wall of the belting layer 5;

referring to fig. 1, the insulated wire core is composed of an insulated layer 2 and a conductor 1, the insulated layer 2 is sleeved on the outer wall of the conductor 1, the insulated layer 2 comprises an inner insulated layer 201 and an outer insulated layer 202 which are sequentially arranged from inside to outside, the insulated layer 2 is formed by double-layer co-extrusion synchronous compact extrusion of the outer insulated layer 202 and the inner insulated layer 201, and then a high-frequency high-voltage electron accelerator is adopted for irradiation crosslinking, so that the insulated electrical property is ensured, the flame retardant, irradiation resistance and long-term thermal aging resistance of the cable insulation are effectively improved, the 90 ℃ thermal life is more than 60 years and meets the special inherent working environment of a nuclear cable, the outer insulated layer 202 is halogen-free low-smoke flame retardant irradiated polyolefin, the volume resistivity at 20 ℃ is more than or equal to 6.5 x 1014 omega, the Cm, the dielectric strength is more than or equal to 30KV/mm, the oxygen index is more than or equal to 30%, the halogen acid gas content is less than or equal to 5mg/g, the PH value is more than or equal to 4.3, and the conductivity is less than or equal to 2.5 mus/mm, The toxicity index is less than or equal to 5, the light transmittance is more than or equal to 60%, the irradiation resistance (60CO-r) is 1000KGy, the elongation at break is more than or equal to 55%, the thermal life at 90 ℃ is more than 60 years, the inner insulating layer 201 is halogen-free low-smoke irradiation polyolefin: the volume resistivity at 20 ℃ is more than or equal to 1.0 x 1016 omega, Cm, the dielectric strength is more than or equal to 38KV/mm, the content of halogen acid gas is less than or equal to 5mg/g, the pH value is more than or equal to 4.3, the conductivity is less than or equal to 2.5 mu s/mm, the toxicity index is less than or equal to 5, the light transmittance is more than or equal to 60 percent, the irradiation resistance (60CO-r) is 1200KGy, the elongation at break is more than or equal to 65 percent, and the thermal life at 90 ℃ is more than 60 years;

referring to fig. 1, the filling layer 3 is a filling rope, the filling rope is an inorganic filling rope, the cable core 4 is formed by twisting a plurality of insulating wire cores and the filling rope, the filling rope is filled between gaps of the plurality of insulating wire cores, and the filling rope is an inorganic paper rope or an alkali-free glass fiber rope;

referring to fig. 1, the outer protective layer 6 is formed by double-layer co-extrusion and irradiation crosslinking of an outer sheath 601 and an oxygen barrier layer 602, the outer protective layer 6 is formed by double-layer co-extrusion and synchronous close extrusion of the outer sheath 601 and the oxygen barrier layer 602, and then irradiation crosslinking is performed by using a high-frequency high-voltage electron accelerator, so that the performances of flame retardance, irradiation resistance, long-term thermal aging resistance and the like of the cable can be effectively improved; the thermal life at 90 ℃ is more than 60 years, and the special inherent working environment of the nuclear cable is met;

the outer sheath 601 is a halogen-free low-smoke flame-retardant irradiation cross-linked thermosetting polyolefin: the volume resistivity at 20 ℃ is more than or equal to 1.0 x 1012 omega, the dielectric strength is more than or equal to 22KV/mm, the oxygen index is more than or equal to 32%, the smoke density is less than or equal to 100 (with flame Dmy), less than or equal to 350 (without flame Dmw), the contents of Hcl and HBr are less than or equal to 0.5%, the content of HF is less than or equal to 0.1%, the pH value is more than or equal to 4.3, the conductivity is less than or equal to 2.5 mu s, the material toxicity index hazard classification ZA2, the light transmittance is more than or equal to 60%, the irradiation resistance (60CO-r) is 1000KGy, the elongation at break is more than or equal to 40%, the thermal life at 90 ℃ is more than 60 years, the thickness is 1.8mm, and the outer diameter is 26.0 mm;

the oxygen barrier layer 602 is ceramic halogen-free low-smoke flame-retardant polyolefin: the volume resistivity at 20 ℃ is more than or equal to 1.0 x 109 omega, Cm, the dielectric strength is more than or equal to 15KV/mm, the oxygen index is more than or equal to 32%, the smoke density is less than or equal to 100 (with flame Dmy), less than or equal to 350 (without flame Dmw), the contents of Hcl and HBr are less than or equal to 0.5%, the content of HF is less than or equal to 0.1%, the pH value is more than or equal to 4.3, the conductivity is less than or equal to 2.5 mu s, the material toxicity index danger classification ZA2, the light transmittance is more than or equal to 60%, the irradiation resistance (60CO-r)1000KGy, the heat life at 90 ℃ is more than 60 years, and the thickness is 1.2 mm;

referring to fig. 1, the slots 7 are uniformly formed between the inner wall of the outer sheath 601 and the outer wall of the oxygen barrier 602, the cable can have a large bending range through the space at the slots 7, the extrusion range of the cable interior is reduced, the cable use effect and the cable use performance are increased, the inner wall of the outer sheath 601 is uniformly provided with holes, the inner cavity of each hole is provided with the reinforcing core 8, and the reinforcing cores 8 are formed by winding thin steel wires with each other, so that the overall length of the cable is increased.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A1E-grade flame-retardant B1 cable for a nuclear power station is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the cable core (4) comprises a plurality of insulating wire cores and a filling layer (3);

the belting layer (5), the outer wall of the cable core (4) is sleeved with the belting layer (5); and the number of the first and second groups,

the outer protective layer (6), outer protective layer (6) cover is established on the outer wall of band layer (5).

2. The 1E-grade flame-retardant B1 cable for nuclear power plant as claimed in claim 1, wherein: the insulation wire core is composed of an insulation layer (2) and a conductor (1), and the insulation layer (2) is sleeved on the outer wall of the conductor (1).

3. The 1E-grade flame-retardant B1 cable for nuclear power plants as claimed in claim 2, wherein: the insulating layer (2) comprises an inner insulating layer (201) and an outer insulating layer (202) which are sequentially arranged from inside to outside.

4. The 1E-grade flame-retardant B1 cable for nuclear power plant as claimed in claim 1, wherein: the filling layer (3) is a filling rope, and the filling rope is an inorganic filling rope.

5. The 1E-grade flame-retardant B1 cable for nuclear power plant as claimed in claim 1, wherein: the outer protective layer (6) is formed by double-layer co-extrusion and irradiation crosslinking of an outer protective layer (601) and an oxygen isolation layer (602).

6. The 1E-grade flame-retardant B1 cable for nuclear power plant as claimed in claim 5, wherein: fluting (7) have evenly been seted up between oversheath (601) inner wall and the oxygen layer (602) outer wall that separates, the hole has evenly been seted up to oversheath (601) inner wall, and the hole inner chamber installs reinforcing core (8).