Ageing-resistant corrosion-resistant radiation-proof medium-voltage power cable

Abstract

The utility model discloses an aging-resistant corrosion-resistant radiation-proof medium-voltage power cable comprising a cable core which is formed by twisting a plurality of insulating wire cores. A gap of the cable core is filled with a polypropylene filling body; a high-corrosion-resistance CPP composite wrapping tape is wrapped outside the cable core, a polyphenylene sulfide thermoplastic aging-resistant layer is extruded outside the high-corrosion-resistance CPP composite wrapping tape, a composite radiation-resistant layer is arranged outside the polyphenylene sulfide thermoplastic aging-resistant layer, a galvanized steel tape armoring layer is wrapped outside the composite radiation-resistant layer in a clearance mode, and the galvanized steel tape armoring layer is wrapped outside the composite radiation-resistant layer in a clearance mode. And a polyvinylidene fluoride outer sheath is arranged outside the galvanized steel tape armor layer. The cable provided by the utility model has excellent anti-corrosion performance and anti-radiation performance at the same time, also has excellent anti-aging, weather-proof, ultraviolet radiation-resistant performance and the like, the service life of the cable is greatly prolonged, and the requirements of the cable in the use environment of the nuclear power industry are met.

Description

Technical Field

[0001] The utility model relates to the field of power cables, in particular to an aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable. Background Art

[0002] With the progress of social economy and science and technology, the scale of use of various electrical equipment has developed rapidly. The use of electrical equipment is inseparable from the connection of cables. The complexity of cable operating conditions has put forward higher requirements on its performance.

[0003] A large number of medium-voltage power cables are used in the construction of power distribution systems. The cables have good insulation performance, which can not only improve the reliability of power supply, but also beautify the cityscape, and have higher value in promotion and application.

[0004] Since a large amount of circulating cooling water is required in the power generation process, nuclear power plants and nuclear facilities are usually located in sparsely populated coastal areas. However, ordinary cables have average anti-aging performance, poor corrosion resistance, and short service life, which cannot meet these requirements.

[0005] In addition, with the development of the nuclear power industry, the construction of nuclear fuel cycle facilities has become a top priority. Compared with nuclear power plants, such nuclear fuel cycle facilities are often prone to higher levels of radiation, so the cables used in these facilities must have high radiation resistance; because in a long-term radiation environment, the internal materials of the cable will accelerate aging and significantly reduce the life of the cable. Therefore, how to improve the radiation resistance and corrosion resistance of the cable is an important measure to ensure the safe development of the nuclear power industry. Utility Model Content

[0006] In order to overcome the deficiencies in the prior art, the utility model provides an aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable, which has excellent anti-corrosion and anti-radiation performance, and solves the problems of the existing medium-voltage power cable having general anti-aging performance, poor corrosion resistance, short service life and poor radiation resistance.

[0007] To achieve the above-mentioned purpose, the utility model provides an aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable, comprising a cable core, wherein the cable core is formed by twisting a plurality of insulating cores; the gaps in the cable core are filled with a polypropylene filler; a highly corrosion-resistant CPP composite wrapping tape is wrapped around the outside of the cable core, a polyphenylene sulfide thermoplastic aging-resistant layer is extruded outside the highly corrosion-resistant CPP composite wrapping tape, a composite radiation-resistant layer is provided outside the polyphenylene sulfide thermoplastic aging-resistant layer, a galvanized steel belt armor layer is wrapped in the gap outside the composite radiation-resistant layer, and a polyvinylidene fluoride outer sheath is provided outside the galvanized steel belt armor layer.

[0008] Furthermore, the polyvinylidene fluoride outer sheath is coated with a nuclear radiation resistant coating layer.

[0009] Furthermore, the insulated wire core comprises a conductor, a conductor shielding layer, a cross-linked polyethylene insulation layer and an insulation shielding layer are sequentially extruded outside the conductor, and a copper tape shielding layer is wrapped outside the insulation shielding layer.

[0010] Furthermore, the conductor is a Class 2 stranded copper conductor in accordance with the GB / T3956-2008 standard.

[0011] Furthermore, the conductor shielding layer is formed by extruding a cross-linked semi-conductive inner shielding material.

[0012] Furthermore, the insulating shielding layer is formed by extruding a cross-linked semi-conductive strippable outer shielding material.

[0013] Furthermore, the highly corrosion-resistant CPP composite wrapping tape comprises a CPP film base layer, the upper and lower surfaces of the CPP film base layer are coated with insulating glue, a polytetrafluoroethylene film is provided on the outer surface of the insulating glue on the upper surface, and a biaxially oriented polypropylene film is provided on the outer surface of the insulating glue on the lower surface.

[0014] Furthermore, the composite radiation-resistant layer comprises an inner layer of nano silver wire radiation-resistant fiber tape and an outer layer of graphitized rubber extrusion layer; a polyimide fiber tape is bonded between the nano silver wire radiation-resistant fiber tape and the graphitized rubber extrusion layer via a semi-conductive adhesive.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The utility model adopts polypropylene filler, which has good acid and alkali resistance, high temperature resistance, good anti-aging performance, high mechanical strength, and ensures the roundness of the cable.

[0017] 2. The inner sheath of the utility model adopts a polyphenylene sulfide aging-resistant layer, which has excellent high temperature resistance, corrosion resistance, aging resistance, flame retardancy, balanced physical and mechanical properties, excellent dimensional stability, and excellent electrical properties, which greatly increases the aging resistance of the cable and prolongs the service life of the cable.

[0018] 3. The utility model adopts an improved high corrosion resistance CPP composite wrapping tape to replace the existing non-woven fabric. The wrapping tape has light specific gravity, high tensile strength, and good chemical corrosion resistance. It can better enhance the tensile strength and mechanical strength inside the cable. Its excellent chemical corrosion resistance can better protect the internal layers of the cable.

[0019] 4. The utility model adopts an improved composite radiation-resistant layer, which utilizes the characteristics of the composite structure to greatly increase the radiation resistance of the cable, allowing the cable to operate and be used normally in a high-radiation environment, and protecting the internal structure of the cable from the influence of the radiation environment. It forms an internal and external radiation-resistant structure with the nuclear radiation-resistant coating layer, which greatly meets the requirements of the cable in the use environment of the nuclear power industry and also improves the service life of the cable.

[0020] 5. The sheath layer of the utility model adopts a polyvinylidene fluoride outer sheath, which has excellent anti-aging, high chemical corrosion resistance, weather resistance, ultraviolet radiation resistance and other properties, increases the corrosion resistance of the cable, avoids the erosion of the cable by the external environment, and greatly improves the overall safety of the cable operation.

[0021] 6. A nuclear radiation resistant coating layer is coated on the outside of the polyvinylidene fluoride outer sheath, which has the characteristics of chemical resistance and radiation resistance, allowing the cable to operate and be used normally in a high radiation environment, better protecting the cable outer sheath from the influence of the radiation environment and meeting the environmental requirements of the cable.

[0022] To sum up, the utility model has excellent anti-corrosion and anti-radiation properties, as well as excellent anti-aging, weather resistance, and ultraviolet radiation resistance, which greatly improves the service life of the cable and meets the requirements of the cable use environment in the nuclear power industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the highly corrosion-resistant CPP composite wrapping tape of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure of the composite radiation-resistant layer of the utility model. DETAILED DESCRIPTION

[0026] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0027] like Figure 1 As shown, the utility model provides an aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable, comprising three insulated cores, the insulated cores comprising a conductor 1, a conductor shielding layer 2, a cross-linked polyethylene insulation layer 3 and an insulation shielding layer 4 are sequentially formed by three-layer co-extrusion of a cross-linking machine outside the conductor, and a copper tape shielding layer 5 is wrapped outside the insulation shielding layer;

[0028] It should be noted here that the conductor adopts Class 2 stranded copper conductor in accordance with GB / T3956-2008 standard; the conductor shielding layer is formed by extruding a cross-linked semi-conductive inner shielding material, and the insulating shielding layer is formed by extruding a cross-linked semi-conductive strippable outer shielding material.

[0029] In this embodiment, three insulated wire cores are twisted into a cable core, and the gaps in the cable core are filled with a polypropylene filler 6, which has good acid and alkali resistance, high temperature resistance, good aging resistance, high mechanical strength, and ensures the roundness of the cable.

[0030] In this embodiment, a highly corrosion-resistant CPP composite wrapping tape 7 is wrapped around the cable core, and a polyphenylene sulfide thermoplastic aging-resistant layer 8 is extruded outside the highly corrosion-resistant CPP composite wrapping tape 7, which has excellent high temperature resistance, corrosion resistance, aging resistance, flame retardancy, balanced physical and mechanical properties, excellent dimensional stability, and excellent electrical properties, which greatly increases the aging resistance of the cable and prolongs the service life of the cable; a composite radiation-resistant layer 9 is provided outside the polyphenylene sulfide thermoplastic aging-resistant layer 8, a galvanized steel belt armor layer 10 is wrapped in the gap outside the composite radiation-resistant layer 9, and a polyvinylidene fluoride outer sheath 11 is provided outside the galvanized steel belt armor layer, which has excellent aging resistance, high chemical corrosion resistance, weather resistance, ultraviolet radiation resistance, etc., increases the corrosion resistance of the cable, avoids the erosion of the cable by the external environment, and greatly improves the safety of the overall operation of the cable.

[0031] In order to further enhance the radiation resistance of the cable, in the present embodiment, the polyvinylidene fluoride outer sheath 11 is coated with a nuclear radiation resistant coating layer 12, which is mainly formed by epoxy or phenolic resin materials. Since the benzene ring has a stable six-membered ring structure, its electron cloud has the function of anti-radiation activation, so the benzene ring is not easy to degrade during nuclear radiation, and phenolic resin and epoxy resin have a large content of benzene rings in their structures and a stable structure, so they have strong radiation resistance; in addition, epoxy or phenolic resins have high functionality, and the cross-linking density of the paint film after being used as a film-forming material is high. The high cross-linking density will make the paint film surface denser, and radioactive pollutants are easy to desorb and have better decontamination properties, so that the cable has the characteristics of chemical resistance and radiation resistance, so that the cable can operate and be used normally in a high radiation environment, better protect the cable outer sheath from the influence of the radiation environment, and meet the environmental requirements of the cable.

[0032] In this embodiment, further optimization is performed, such as Figure 2As shown, the highly corrosion-resistant CPP composite wrapping tape 7 includes a CPP film base layer 71, and the upper and lower surfaces of the CPP film base layer are coated with insulating glue 72. The double-layer insulation can make the wrapping tape have excellent insulation and avoid leakage; a polytetrafluoroethylene film 73 is provided on the outer surface of the insulating glue on the upper surface, which has strong wear resistance and can protect the inner layer. It has the smallest surface tension in solid materials and also has excellent high and low temperature resistance. Due to the high bond energy of the CF bond and stable performance, it has excellent chemical corrosion resistance; a biaxially oriented polypropylene film 74 is provided on the outer surface of the insulating glue 72 on the lower surface, which has the advantages of light weight, non-toxicity, odorlessness, moisture resistance, high mechanical strength, good barrier properties, high impact strength, low temperature resistance, etc., and the tensile strength (longitudinal / transverse)>120 / 200MPa; elongation at break ( Longitudinal / transverse) <180% / 65%; elastic modulus is 1700-2500Mpa; brittle temperature is -50℃, which enhances the impact strength and mechanical strength of the highly corrosion-resistant CPP composite wrapping tape;

[0033] The improved CPP cable wrapping tape replaces the existing non-woven tape. The tape has light specific gravity, high tensile strength, and good chemical corrosion resistance. It better enhances the tensile strength and mechanical strength inside the cable. Its excellent chemical corrosion resistance provides better protection for the internal layers of the cable.

[0034] In this embodiment, further optimization is performed, such as Figure 3 As shown, the composite radiation-resistant layer 9 includes an inner layer of nano silver wire radiation-resistant fiber tape 91 and an outer layer of graphitized rubber extrusion layer 92; a polyimide fiber tape 93 is bonded between the nano silver wire radiation-resistant fiber tape and the graphitized rubber extrusion layer by a semi-conductive adhesive; wherein the nano silver wire fiber tape has good electromagnetic radiation protection performance, and the polyimide fiber tape has high and low temperature resistance, flame retardancy, no melting droplets, self-extinguishing when away from fire, and excellent thermal insulation; graphitized rubber is a rubber material with graphite as a filler, which has high thermal conductivity and electrical conductivity, can effectively dissipate heat and resist radiation under the influence of high temperature and high radiation environment, and maintain stable physical and chemical properties; the improved composite radiation-resistant layer is used, and the characteristics of the composite structure are utilized to greatly increase the radiation resistance of the cable, so that the cable can operate and be used normally in a high radiation environment, and protect the internal structure of the cable from the influence of the radiation environment, and form an internal and external radiation-resistant structure with the nuclear radiation-resistant coating layer 12, which greatly meets the requirements of the cable in the use environment of the nuclear power industry, and the service life of the cable is also improved.

[0035] To sum up, through the above design, the utility model has excellent anti-corrosion and anti-radiation properties, as well as excellent anti-aging, weather resistance, and ultraviolet radiation resistance, which greatly improves the service life of the cable and meets the requirements of the cable use environment in the nuclear power industry.

[0036] The utility model has many specific application paths. The above is only the preferred implementation mode of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the utility model. These improvements should also be regarded as the protection scope of the utility model.

Claims

1. An aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable, characterized in that: It comprises a cable core, which is formed by twisting a plurality of insulating cores; the gaps in the cable core are filled with a polypropylene filler; a highly corrosion-resistant CPP composite wrapping tape is wrapped around the outside of the cable core, a polyphenylene sulfide thermoplastic aging-resistant layer is extruded outside the highly corrosion-resistant CPP composite wrapping tape, a composite radiation-resistant layer is arranged outside the polyphenylene sulfide thermoplastic aging-resistant layer, a galvanized steel belt armor layer is wrapped in the gap outside the composite radiation-resistant layer, and a polyvinylidene fluoride outer sheath is arranged outside the galvanized steel belt armor layer.

2. The aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable according to claim 1, characterized in that: The polyvinylidene fluoride outer sheath is coated with a nuclear radiation resistant coating layer.

3. The aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable according to claim 1, characterized in that: The insulated wire core comprises a conductor, a conductor shielding layer, a cross-linked polyethylene insulating layer and an insulating shielding layer are sequentially extruded outside the conductor, and a copper tape shielding layer is wrapped outside the insulating shielding layer.

4. The aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable according to claim 3 is characterized in that: The conductor is a second-class stranded copper conductor in accordance with the GB / T3956-2008 standard.

5. The aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable according to claim 3 is characterized in that: The conductor shielding layer is formed by extruding a cross-linked semi-conductive inner shielding material.

6. The aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable according to claim 3, characterized in that: The insulating shielding layer is formed by extruding a cross-linked semi-conductive strippable outer shielding material.

7. The aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable according to claim 1, characterized in that: The highly corrosion-resistant CPP composite wrapping tape comprises a CPP film base, the upper and lower surfaces of which are coated with insulating glue, a polytetrafluoroethylene film is arranged on the outer surface of the insulating glue on the upper surface, and a biaxially oriented polypropylene film is arranged on the outer surface of the insulating glue on the lower surface.

8. The aging-resistant, corrosion-resistant and radiation-proof medium-voltage power cable according to claim 1, characterized in that: The composite radiation-resistant layer comprises an inner layer of nano silver wire radiation-resistant fiber belt and an outer layer of graphitized rubber extrusion layer; a polyimide fiber belt is bonded between the nano silver wire radiation-resistant fiber belt and the graphitized rubber extrusion layer by a semi-conductive adhesive.

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