High temperature and high pressure pulse cable for nuclear power plant

Abstract

The utility model provides a high temperature high pressure pulse cable for nuclear power station, include: single copper conductor and cross -linked polyimide insulating layer of extruding on copper conductor constitute insulating wire core, there is tinned copper wire double -layer weaving outside insulating wire core, adopt the outer sheath of cross -linked polyethylene material and extrude in weaving layer outside. The utility model in the conductor adopts single copper conductor to reduce the gap discharge under high pressure, because the conductor outer diameter is consistent, reduces the attenuation, guarantees the stability of signal transmission, the cross -linking technology adopts electron irradiation process in insulating layer, improves the temperature resistance grade, the radiation resistance of cable and the uniformity of cross -linked polyimide medium, reduces the loss of medium transmission, strengthens the electric strength, the weaving layer adopts the double shielding of double -layer copper wire weaving, can effectively shield the outside interference, guarantees the smooth transmission of signal, the outer sheath adopts cross -linked polyethylene sheath material, improves the heat resistance, the insulating property and corrosion resistance of cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and more specifically, to a high-temperature and high-voltage pulse cable for nuclear power plants. Background Technology

[0002] Under the extreme operating conditions of nuclear power plants, any monitoring equipment must face multiple stringent challenges: a complex environment combining continuous high temperatures, strong radiation doses, and corrosive chemical sprays. Given the limited tolerance thresholds of electronic components to temperature and radiation, critical circuitry must be placed in controlled, temperate areas. Therefore, guided wave radar level gauges are used for level monitoring in sump or spent fuel pools. When guided wave radar technology is used for level measurement in sump or spent fuel pools, two technical challenges arise: the equipment must directly withstand instantaneous thermal and high-pressure shocks; and the RF transceiver module and guided wave antenna must be physically isolated, requiring the coaxial transmission link to ensure extremely low signal attenuation to guarantee measurement accuracy.

[0003] The prior art disclosed in announcement number "CN222619449U" is a high-temperature and high-voltage resistant radio frequency cable for nuclear power plants, comprising: an inner conductor located at the center of the radio frequency cable; the inner conductor is circumferentially covered with an insulation layer, a shielding layer, a sheath layer, and an outer armor layer from the inner layer to the outer layer; the outer armor layer covers the outer circumferential side of the sheath layer and is made of metal wire; both the insulation layer and the sheath layer are manufactured using an irradiation cross-linking process; the sheath layer is made of low-smoke halogen-free flame-retardant cross-linked polyolefin; the insulation layer is made of irradiated cross-linked polyethylene, and the thickness of the insulation layer ranges from 2.8 to 3.1 mm. However, the inner conductor of this prior art uses silver-plated copper stranded wire, which exhibits gap discharge under high-voltage conditions, resulting in poor overall anti-attenuation performance; furthermore, the temperature resistance and radiation resistance of this prior art also need improvement. Utility Model Content

[0004] To overcome the shortcomings of the prior art in terms of poor cable attenuation resistance, temperature resistance, and radiation resistance, this utility model provides a high-temperature and high-voltage pulse cable for nuclear power plants, which can be used to stably transmit high-voltage pulse signals in equipment operating in the high-temperature environment of nuclear power plants.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0006] A high-temperature, high-voltage pulse cable for nuclear power plants includes: a single solid conductor, an insulation layer, a first braided layer, a second braided layer, and an outer sheath;

[0007] The insulating layer covers the single solid conductor to form an insulated core, the first braided layer covers the insulated core, the second braided layer covers the outside of the first braided layer, and the outer sheath covers the outside of the second braided layer.

[0008] Preferably, the single solid conductor is a single oxygen-free solid copper conductor.

[0009] Preferably, the outer diameter error of the single solid conductor is ±0.005 mm.

[0010] Preferably, the insulating layer is made of cross-linked polyimide material.

[0011] Preferably, the insulating layer is made of cross-linked polyimide material, and the preparation process is electron beam irradiation process with an irradiation dose of 18-20 MRad. The concentricity between the insulating layer and the single solid conductor is >99%.

[0012] Preferably, both the first braided layer and the second braided layer are made of tin-plated copper wire braiding material.

[0013] Preferably, the weaving density of the first braided layer is 94-96%, and the outer diameter error is ±0.02mm.

[0014] Preferably, the weaving density of the second braided layer is 93-95%, and the outer diameter error is ±0.02mm.

[0015] Preferably, the outer sheath is made of cross-linked polyethylene material.

[0016] Preferably, the outer sheath is made of cross-linked polyethylene material, the cross-linking process is electron beam irradiation, the irradiation dose is 22-24 MRad, and the outer diameter error is ±0.1 mm.

[0017] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0018] This utility model provides a high-temperature and high-voltage pulse cable for nuclear power plants, comprising: a single copper conductor and a cross-linked polyimide insulation layer extruded on the copper conductor to form an insulated core, the insulated core being covered by a double layer of tin-plated copper wire braid, and an outer sheath made of cross-linked polyethylene material extruded on the braided layer.

[0019] This invention uses a single copper conductor to reduce gap discharge under high voltage. The uniform outer diameter of the conductor reduces attenuation and ensures stable signal transmission. The insulation layer uses cross-linked polyimide, and the cross-linking process employs electron irradiation, improving the cable's temperature resistance, radiation resistance, and the uniformity of the cross-linked polyimide medium, reducing transmission loss and enhancing dielectric strength. The braided shield uses double-layer copper wire braiding, effectively shielding against external interference and ensuring smooth signal transmission. The outer sheath uses cross-linked polyethylene material, improving the cable's heat resistance, insulation, and corrosion resistance. Based on the above structure, this invention effectively reduces manufacturing costs while ensuring performance, guaranteeing stable high-voltage pulse signal transmission in the high-temperature environment of nuclear power plants. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a high-temperature, high-voltage pulse cable for a nuclear power plant provided in Example 1. Detailed Implementation

[0021] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this application.

[0022] To better illustrate this embodiment, some parts in the accompanying drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions;

[0023] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings.

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0025] Example 1

[0026] like Figure 1 As shown, this embodiment provides a high-temperature and high-voltage pulse cable for nuclear power plants, comprising: a single solid conductor 1, an insulation layer 2, a first braided layer 3, a second braided layer 4, and an outer sheath 5;

[0027] The insulating layer 2 covers the single solid conductor 1 to form an insulated wire core, the first braided layer 3 covers the insulated wire core, the second braided layer 4 covers the first braided layer 3, and the outer sheath 5 covers the second braided layer 4.

[0028] In the specific implementation process, an insulated wire core is formed by a single solid conductor 1 and an insulating layer 2 extruded on the single solid conductor 1. The insulating wire core is surrounded by a first braided layer 3 forming an inner shielding layer, and a second braided layer 4 forming an outer shielding layer. The outer sheath 5 is extruded on the outer shielding layer.

[0029] Example 2

[0030] This embodiment provides a high-temperature and high-voltage pulse cable for nuclear power plants, comprising: a single solid conductor 1, an insulation layer 2, a first braided layer 3, a second braided layer 4, and an outer sheath 5;

[0031] The insulating layer 2 covers the single solid conductor 1 to form an insulated wire core, the first braided layer 3 covers the insulated wire core, the second braided layer 4 covers the first braided layer 3, and the outer sheath 5 covers the second braided layer 4.

[0032] The single solid conductor 1 is a single oxygen-free solid copper conductor.

[0033] The outer diameter error of the single solid conductor 1 is ±0.005mm.

[0034] The insulating layer 2 is made of cross-linked polyimide material.

[0035] The insulating layer 2 is made of cross-linked polyimide material and is prepared by electron beam irradiation with an irradiation dose of 18-20 MRad. The concentricity between the insulating layer and the single solid conductor is >99%.

[0036] Both the first braided layer 3 and the second braided layer 4 are made of tin-plated copper wire braiding material.

[0037] The first braided layer 3 has a braiding density of 94-96% and an outer diameter error of ±0.02mm.

[0038] The second braided layer 4 has a braiding density of 93-95% and an outer diameter error of ±0.02mm.

[0039] The outer sheath 5 is made of cross-linked polyethylene material.

[0040] The outer sheath 5 is made of cross-linked polyethylene material, and the cross-linking process is electron beam irradiation process with an irradiation dose of 22-24 MRad and an outer diameter error of ±0.1 mm.

[0041] In the specific implementation process, the single solid conductor 1 is an oxygen-free solid copper conductor with an outer diameter error controlled within ±0.005mm. The conductor surface is smooth, free of burrs and oil stains, thereby reducing gap discharge under high voltage. Because the conductor outer diameter is consistent, attenuation is reduced, ensuring the stability of signal transmission. The insulation layer 2 is made of cross-linked polyimide insulation material, extruded onto the single solid conductor 1. The cross-linking process uses electron beam irradiation with an irradiation dose of 18-20 MRad. The surface is smooth and round with a concentricity >99%, improving the cable's temperature resistance, radiation resistance, and... The uniformity of the cross-linked polyimide medium reduces transmission loss and enhances electrical strength. The first braided layer 3 and the second braided layer 4 are double-shielded using double-layer tin-plated copper wire braiding, with a braiding density of 93-95% for both layers, effectively shielding against external interference and ensuring smooth signal transmission. The outer sheath 5 is made of cross-linked ethylene, with the cross-linking process employing electron beam irradiation at a dose of 22-24 MRad. This results in a smooth, round appearance, uniform thickness, and consistent outer diameter, with an outer diameter error controlled within ±0.1 mm, thus improving the cable's heat resistance, insulation, and corrosion resistance.

[0042] The same or similar labels correspond to the same or similar parts;

[0043] The terms used to describe positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting this application.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A high-temperature, high-voltage pulse cable for nuclear power plants, characterized in that, include: A single solid conductor (1), an insulation layer (2), a first braided layer (3), a second braided layer (4), and an outer sheath (5); The insulating layer (2) covers the single solid conductor (1) to form an insulated wire core, the first braided layer (3) covers the insulated wire core, the second braided layer (4) covers the first braided layer (3), and the outer sheath (5) covers the second braided layer (4).

2. The high-temperature, high-voltage pulse cable for nuclear power plants according to claim 1, characterized in that, The single solid conductor (1) is a single oxygen-free solid copper conductor.

3. The high-temperature, high-voltage pulse cable for nuclear power plants according to claim 2, characterized in that, The outer diameter error of the single solid conductor (1) is ±0.005mm.

4. The high-temperature, high-voltage pulse cable for nuclear power plants according to claim 1, characterized in that, The insulating layer (2) is made of cross-linked polyimide material.

5. A high-temperature, high-voltage pulse cable for nuclear power plants according to claim 4, characterized in that, The insulating layer (2) is made of cross-linked polyimide material and is prepared by electron beam irradiation with an irradiation dose of 18-20 MRad. The concentricity of the insulating layer (2) and the single solid conductor (1) is >99%.

6. A high-temperature, high-voltage pulse cable for nuclear power plants according to claim 1, characterized in that, Both the first braided layer (3) and the second braided layer (4) are made of tin-plated copper wire braiding material.

7. A high-temperature, high-voltage pulse cable for nuclear power plants according to claim 6, characterized in that, The first braided layer (3) has a braiding density of 94-96% and an outer diameter error of ±0.02mm.

8. A high-temperature, high-voltage pulse cable for nuclear power plants according to claim 6, characterized in that, The second braided layer (4) has a braiding density of 93-95% and an outer diameter error of ±0.02mm.

9. A high-temperature, high-voltage pulse cable for nuclear power plants according to claim 1, characterized in that, The outer sheath (5) is made of cross-linked polyethylene material.

10. A high-temperature, high-voltage pulse cable for nuclear power plants according to claim 9, characterized in that, The outer sheath (5) is made of cross-linked polyethylene material. The cross-linking process is electron beam irradiation process with an irradiation dose of 22-24 MRad and an outer diameter error of ±0.1 mm.

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