CN111580229B - Lightning protection optical cable - Google Patents
Lightning protection optical cable Download PDFInfo
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- CN111580229B CN111580229B CN202010448656.5A CN202010448656A CN111580229B CN 111580229 B CN111580229 B CN 111580229B CN 202010448656 A CN202010448656 A CN 202010448656A CN 111580229 B CN111580229 B CN 111580229B
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- optical cable
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
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- Optics & Photonics (AREA)
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Abstract
The invention belongs to the field of optical cables, and particularly relates to a lightning protection optical cable. It includes: the core wire, the water-blocking inner sheath, the insulating shielding layer, the insulating layer, the high heat-insulating layer and the outer sheath are arranged from inside to outside; the core wire is composed of a single-core optical fiber or a multi-core optical fiber; the water-blocking inner sheath is prepared from HDPE or MDPE material; the insulating layer is tightly coated on the outer surface of the insulating shielding layer, and the insulating shielding layer is tightly coated on the outer surface of the water-blocking inner sheath; the high heat insulation layer is coated on the outer surface of the insulation layer, the outer sheath is coated on the outer surface of the high heat insulation layer, and reinforcing members are arranged between the outer sheath and the high heat insulation layer and are symmetrically arranged around the axis of the optical cable; the cross section of the reinforcing member is arched, the outer side of the arched reinforcing member is convexly embedded into the inner wall of the outer sheath, and the inner side of the arched reinforcing member is arc-shaped and tangent to the outer surface of the high heat insulation layer; and insulating epoxy resin is filled between the outer sheath and the high heat insulation layer to form an insulating filling layer. The optical cable has good effects of lightning protection and optical fiber protection.
Description
Technical Field
The invention belongs to the field of optical cables, and particularly relates to a lightning protection optical cable.
Background
Optical fiber cables (optical fiber cables) are manufactured to meet optical, mechanical, or environmental performance specifications and are telecommunication cable assemblies that utilize one or more optical fibers disposed in a surrounding jacket as the transmission medium and that may be used individually or in groups.
In some special installation environments, optical cables are further required to meet a variety of requirements. For example, submarine cables laid on the seabed need to meet the performances of high pressure resistance, water resistance, bite resistance and the like, submarine cables erected across the sea need to meet the performances of high distortion resistance, high strength and the like, and the submarine cables need to have good lightning protection performance in some areas with high lightning.
In general, an optical cable can be constructed of an all-plastic and metal-free member, but in field erection, an optical cable made of an all-plastic and metal-free member has a problem that strength is insufficient and it is difficult to erect the optical cable over a long distance, and therefore a member made of metal, which is generally called a reinforcing member, needs to be built in.
However, the introduction of the metal reinforcing member causes a problem of electrical breakdown of the optical cable in a lightning-intensive area, resulting in damage to the optical cable. Under the general condition, the optical cable electric breakdown event that produces in the natural environment, it is not many directly because the breakdown that the thunderbolt produced, and the solid dielectric breakdown that the induced electric field that leads to the metal component to produce leads to the optical cable to damage because the strong electric field effect mostly leads to the optical cable, and most of current lightning protection optical cables adopt modes such as laying lightning protection ground wire, adopting non-metallic material's strengthening member to carry out the lightning protection mostly, nevertheless all have certain defect and not enough.
Disclosure of Invention
The invention provides a lightning protection optical cable, aiming at solving a series of problems that the lightning protection effect generated by the existing optical cable lightning protection technology is limited, most of the problems have defects or shortcomings, and the arrangement is complicated.
The invention aims to:
firstly, the optical cable has a good lightning protection effect;
and secondly, inducing weak electric breakdown inside the optical cable to protect the optical fiber of the optical cable.
In order to achieve the purpose, the invention adopts the following technical scheme.
A lightning protection optical cable comprising:
the core wire, the water-blocking inner sheath, the insulating shielding layer, the insulating layer, the high heat-insulating layer and the outer sheath are arranged from inside to outside;
the core wire is composed of a single-core optical fiber or a multi-core optical fiber;
the water-blocking inner sheath is prepared from HDPE or MDPE material;
the insulating layer is tightly coated on the outer surface of the insulating shielding layer, and the insulating shielding layer is tightly coated on the outer surface of the water-blocking inner sheath;
the high heat insulation layer is coated on the outer surface of the insulation layer, the outer sheath is coated on the outer surface of the high heat insulation layer, and reinforcing members are arranged between the outer sheath and the high heat insulation layer and are symmetrically arranged around the axis of the optical cable;
the cross section of the reinforcing member is arched, the outer side of the arched reinforcing member is convexly embedded into the inner wall of the outer sheath, and the inner side of the arched reinforcing member is arc-shaped and tangent to the outer surface of the high heat insulation layer;
and insulating epoxy resin is filled between the outer sheath and the high heat insulation layer to form an insulating filling layer.
As a preference, the first and second liquid crystal compositions are,
a wrapping tape is wrapped outside the core wire to form a wrapping tape layer;
and composite filler is filled between the water-blocking inner sheath and the belting layer.
As a preference, the first and second liquid crystal compositions are,
the composite filler is prepared from sepiolite powder, cyclic phosphate ester epoxy resin, a P-C-N flame-retardant system and deionized water in a mass ratio of 1: (0.9-1.15): (3.5-4.5): (1.2-2.0) in the ratio of the above components.
As a preference, the first and second liquid crystal compositions are,
the high thermal insulation layer is made of GFRP material.
As a preference, the first and second liquid crystal compositions are,
the mass ratio of the insulating epoxy resin is 1: (3.8-4.15) ScotchcastTM#281 Electrical insulating resin and ScotchcastTM#9 electric insulating resin.
As a preference, the first and second liquid crystal compositions are,
a pair of discharge components are embedded in the outer sheath;
the outer end of the discharge component is embedded in the outer sheath, and the inner end of the discharge component penetrates through the insulating filling layer and is tangent to the outer side wall of the high heat insulation layer.
As a preference, the first and second liquid crystal compositions are,
the discharge component is prepared from CFRP materials.
As a preference, the first and second liquid crystal compositions are,
a lightning protection component is embedded in the outer sheath;
the lightning protection member is disposed between the reinforcing member and the discharge member.
As a preference, the first and second liquid crystal compositions are,
the outer end of the lightning protection component is embedded in the outer sheath, and the inner end of the lightning protection component penetrates through the insulating filling layer and is tangent to the outer side wall of the high heat insulation layer.
As a preference, the first and second liquid crystal compositions are,
the lightning protection component is made of CFRP materials.
The invention has the beneficial effects that:
1) the lightning protection effect is good;
2) even if the optical cable generates electric breakdown inside, the optical cable can be prevented from being seriously damaged, and the optical fiber can normally transmit signals.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
in the figure: the cable comprises a core wire 1, a belting layer 2, filler 3, a water-blocking inner sheath 4, arch grains 41, an insulating shielding layer 5, an insulating layer 6, a high heat-insulating layer 7, an outer sheath 8, a reinforcing member 9, an insulating filling layer 10, a discharge member 11, a first metal net 1101, a lightning protection member 12 and a second metal net 1201.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawing figures. Those skilled in the art will be able to implement the invention based on these teachings. Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., and "several" means one or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
A lightning protection cable, as shown in fig. 1, comprising: the core wire 1, the belting layer 2, the water-blocking inner sheath 4, the insulating shielding layer 5, the insulating layer 6, the high heat-insulating layer 7 and the outer sheath 8 are arranged from inside to outside;
the core wire 1 is composed of a single-core optical fiber or a multi-core optical fiber, and the embodiment takes the single-core optical fiber as an example for explanation; the band layer 2 is formed by wrapping and tightening the core wires 1 with non-woven fabric bands, and the core wires 1 can be simply and efficiently wrapped and tightened by adopting a spiral winding mode, so that the primary protection of the core wires 1 is realized;
the water-blocking inner sheath 4 is made of HDPE or MDPE material, has good water-blocking performance, and is preferably made of MDPE material, the water-blocking inner sheath 4 made of MDPE material has good anti-cracking performance and is better in adaptability to various environments, although the water-blocking performance of HDPE is better than that of MDPE, the HDPE has the defect of poor anti-cracking performance, and usually, the MDPE meets the waterproof requirement of the optical cable, and the cost is lower;
the filler 3 is filled between the water-blocking inner sheath 4 and the belting layer 2, the filler 3 is a composite filler 3 which is in a jelly-like gel state at normal temperature, and in the embodiment, the composite filler 3 is prepared by mixing sepiolite powder, annular phosphate ester epoxy resin, a P-C-N flame-retardant system and deionized water in a mass ratio of 1: 1: 4: 1.5, and the water-blocking inner sheath 4 is internally provided with arch grains 41 shown in figure 2, wherein the arch grains 41 are uniformly distributed around the axial center of the optical cable in the circumferential direction and are arranged along the axial direction of the optical cable;
the water-blocking inner sheath 4 with the arch grains 41 on the inner wall can generate a certain lifting effect on the anti-distortion capacity, and the filler 3 is the non-hard filler 3, so that a certain softening phenomenon exists under the condition of higher temperature, and therefore if the water-blocking inner sheath is directly coated with the round inner sheath, the problem of softening deformation of the whole cable to a certain degree is easily caused under the action of gravity under the condition of higher temperature, and the water-blocking inner sheath 4 has better structural stability due to the arrangement of the arch grains 41, so that the whole optical cable is kept to be in higher roundness;
in addition, the selected composite filler 3 is the filler 3 which has good applicability for the technical scheme of the invention through tests, and has good heat insulation and flame retardant properties, and compared with the conventional heat insulation filler 3 such as hollow glass beads and the like, the sepiolite powder is slightly insufficient in flame retardant properties, but can also play a good role in strengthening insulation and resisting electrical breakdown when used in the application;
the insulating layer 6 is made of ethylene propylene diene monomer rubber, the insulating shielding layer 5 is made of polypropylene shielding material, the insulating layer 6 is tightly coated on the outer surface of the insulating shielding layer 5, the insulating shielding layer 5 is tightly coated on the outer surface of the water-blocking inner sheath 4, certain electromagnetic shielding and insulating effects are achieved, interference and damage to the core wire 1 caused by external electric field environment, current and the like are weakened, and a certain anti-electric insulation protection effect is achieved;
the high thermal insulation layer 7 is made of GFRP materials, and the GFRP materials have the advantages of low cost, high strength, light weight, chemical corrosion resistance, good weather resistance, good thermal insulation performance and the like;
the outer sheath 8 is prepared by common polyethylene sheath materials;
a conventional metal reinforcing member 9 is arranged between the outer sheath 8 and the high heat insulation layer 7, the reinforcing members 9 are symmetrical about the axis of the optical cable and are arranged at the upper end and the lower end between the outer sheath 8 and the high heat insulation layer 7 in the optical cable shown in figure 1, the cross section of each reinforcing member 9 is arched as shown in figure 1, the outer side of each arched reinforcing member 9 is convexly embedded into the inner wall of the outer sheath 8, and the inner side of each arched reinforcing member is in an arc shape and is tangent to the outer surface of the high heat insulation layer 7;
insulating epoxy resin is filled between the outer sheath 8 and the high heat insulation layer 7 to form an insulating filling layer 10, room temperature curing liquid insulating resin and oven curing filling liquid insulating resin are preferably adopted for compounding, and the mass ratio is more preferably 1: (3.8-4.15) ScotchcastTM#281 Electrical insulating resin and ScotchcastTM#9 electric insulating resin;
the insulating epoxy resin formed by compounding can be used as a bonding agent firstly after being filledFor use, improve the combination stability of oversheath 8 and high insulating layer 7, can solidify at 40 ~ 50 ℃ after the outer sheath 8 cladding is accomplished and form insulating filling layer 10 to compare in the high insulating layer 7 of GFRP and polyethylene oversheath 8, it also possesses insulating nature, but certain gradient difference exists in three insulating nature, and this embodiment adopts the mass ratio 1: scotchcast of 4TM#281 Electrical insulating resin and ScotchcastTM#9 electric insulation resin to obtain insulation epoxy resin;
in the optical cable with the structure, under the action of a strong electric field of a natural environment in a thunderstorm weather environment, firstly, the reinforcing member 9 can generate an induction electric field, under the normal condition, the metal reinforcing member 9 in the optical cable generates the induction electric field to drive cold emission electrons or heat emission electrons existing in each layer of solid medium materials such as a sheath, a water blocking layer and the like in the whole optical cable to accelerate to obtain kinetic energy, the kinetic energy interacts with lattice vibration to transfer electric field energy to the lattice so that the solid medium generates stable weak conductance, and along with the continuous action of the electric field, when the energy obtained by electrons from the electric field of the natural thunderstorm weather environment is larger than the energy transferred to the lattice vibration, the kinetic energy of the electrons is larger and larger, the interaction of the electrons and the lattice vibration after reaching a threshold value generates new electrons, so that the number of the free electrons is increased sharply, the conductance is increased and tends to be unstable, thereby generating breakdown;
the designed structure of the invention ensures that a certain 'breakdown sacrificial' part is formed in the optical cable, and special insulating epoxy resin which is easy to generate breakdown is generated between the outer sheath 8 and the high heat insulation layer 7, so that the optical cable is formed to be broken along the circumferential direction of the insulating filling layer 10 when the electric breakdown occurs, the special insulating epoxy resin used by the invention has the characteristic of low heat generation, the optical cable breakdown damage is not caused by strong electric fields and currents, but is mostly caused by a large amount of heat generated by the breakdown of solid media, the special insulating epoxy resin used by the invention can not generate a large amount of heat after the breakdown occurs through tests, and the problem that the optical fiber is damaged due to the large amount of inward dissipation of heat can be ensured by adding the high heat insulation layer 7, so the optical cable has excellent use effect when being used for lightning protection optical cables in areas with high thunderstorm.
By adopting the same structure, the special insulating epoxy resin is replaced by the conventional crosslinked polyethylene to be filled to form an insulating filling layer 10 as a comparative example 1, the conventional nonmetal reinforcing member 9 lightning protection optical cable is used as a comparative example 2, the optical cable, the comparative example 1 and the comparative example 2 are respectively provided with ten optical cables with the length of one meter for carrying out one-time breakdown test, the current of the insulating filling layer 10 is detected in real time, and the electric breakdown is marked after measurable obvious current (approximately equal to 1A) is generated in the insulating filling layer 10, so that the two reinforcing members 9 in the optical cable are electrified, the electrified voltage is gradually increased until the electric breakdown is generated, and the electric breakdown is kept for 10 s;
through tests, compared with comparative example 2, the energizing voltage of the reinforcing member 9 is reduced by 12% when the electric breakdown occurs, and compared with comparative example 1, the energizing voltage when the electric breakdown occurs is basically even, namely, compared with comparative example 2, the structural optical cable and the structural optical cable are easier to generate the breakdown due to the existence of the metal member;
cutting off the optical cable after breakdown to observe the damage of the optical cable on the cross section, wherein the optical cable in comparative example 2 generates obvious burning traces on the whole and generates serious damage, the optical cable basically loses optical signal transmission capability, the optical cable in comparative example 1 generates obvious burning traces on the parts, close to the insulating filling layer 10, of the insulating filling layer 10, the outer sheath 8 and the high heat insulation layer 7 after breakdown, and the optical signal transmission capability generates 11-13% loss.
Example 2
Further, on the basis of embodiment 1, in order to improve the service life of the optical cable, the optical cable is further embedded with a pair of discharge members 11 with oblong cross sections in an outer sheath 8, the discharge members 11 are prepared by adopting a CFRP material, the outer ends of the discharge members are embedded in the outer sheath 8, and the inner ends of the discharge members penetrate through an insulating filling layer 10 and are tangent to the outer side wall of the high thermal insulation layer 7;
the discharge members 11 are arranged symmetrically with respect to the line connecting the two reinforcing members 9 as a line of symmetry, as shown in fig. 1;
the outer surface of the discharge member 11 is coated with a first metal mesh 1101, and the first metal mesh 1101 is a stainless steel metal mesh in this embodiment;
the preparation of the discharge component 11 reduces the 'breakdown thickness', further reduces the voltage required for generating the electrical breakdown, namely the electrical breakdown is easier to generate, the voltage for generating the electrical breakdown is about 72% of that of the embodiment 1 through tests, but the heat generated after the breakdown is smaller, the damage to the insulating filling layer 10 is smaller, the heat productivity of the insulating filling layer 10 is lower, the protection effect on the optical cable is better, and the discharge component 11 can realize quick current lead-out after the breakdown is generated, so that the continuous keeping of a strong electric field in the optical cable is avoided;
the breakdown tests as described in example 1 were carried out for examples 1 and 2, and ten breakdown tests were carried out each with ten optical cables arranged in lengths of one meter;
through tests, the rate of the insulating filling layer 10 of the optical cable in example 2 recovering to no current after breakdown and power failure is increased by 262-281% compared with example 1, and after ten electrical breakdown tests, the insulating filling layer 10 of the optical cable in example 1 generates obvious burning traces, the burning area of the insulating filling layer 10 in the cross section is about 20-30% of the area of the total insulating filling layer 10, and the burning area of the insulating filling layer 10 in the cross section of the insulating filling layer 10 in example 2 is only about 6-9% of the area of the total insulating filling layer 10.
Example 3
On the basis of the embodiment 2, a lightning protection member 12 is further embedded in the outer sheath 8 of the optical cable, the lightning protection member 12 is also prepared by adopting a CFRP material, the outer end of the lightning protection member is embedded in the outer sheath 8, and the inner end of the lightning protection member penetrates through the insulating filling layer 10 and is tangent to the outer side wall of the high thermal insulation layer 7; a lightning protection component 12 is arranged between the reinforcing component 9 and the discharge component 11; the lightning protection component 12 is externally coated with a second metal mesh, and the second metal mesh 1201 in this embodiment is a stainless steel metal mesh;
the breakdown tests as described in example 1 were carried out for examples 1, 2 and 3, and ten one meter lengths of the fiber optic cables were set up and each was subjected to fifty breakdown tests;
the test shows that the voltage for generating the electric breakdown of the embodiment 3 is about 56 percent of that of the embodiment 1, the temperature of the tested optical cable is monitored in real time by using infrared temperature measuring equipment, when the electric breakdown occurs, the heat generated by the embodiment 2 is only 67-71% of the embodiment 1, the heat generated by the embodiment 3 is only 48-53% of the embodiment 1, furthermore, fifty times of electrical breakdown tests show that the insulation filling layer 10 of the optical cable in the embodiment 1 generates obvious burning traces, the burning area of the insulation filling layer 10 in the cross section is about 65-80% of the total area of the insulation filling layer 10, while the burning area of the insulation filling layer 10 in the cross section of the insulation filling layer 10 in the embodiment 2 is about 25-35% of the total insulation filling layer 10 area, in example 3, the burning area of the insulating filling layer 10 in the cross section of the insulating filling layer 10 is only about 4-7% of the total area of the insulating filling layer 10;
in addition, after fifty electric breakdowns, the optical signal transmission capability of the optical cable in the embodiment 1 is reduced by about 26-28%, the optical signal transmission capability of the optical cable in the embodiment 2 is reduced by about 11-14%, and the optical signal transmission capability of the optical cable in the embodiment 3 is reduced by only about 2-3%, so that an extremely excellent lightning protection effect is generated.
Claims (9)
1. A lightning protection optical cable, comprising:
the core wire, the water-blocking inner sheath, the insulating shielding layer, the insulating layer, the high heat-insulating layer and the outer sheath are arranged from inside to outside;
the core wire is composed of a single-core optical fiber or a multi-core optical fiber;
the water-blocking inner sheath is prepared from HDPE or MDPE material;
the insulating layer is tightly coated on the outer surface of the insulating shielding layer, and the insulating shielding layer is tightly coated on the outer surface of the water-blocking inner sheath;
the high heat insulation layer is coated on the outer surface of the insulation layer, the outer sheath is coated on the outer surface of the high heat insulation layer, and reinforcing members are arranged between the outer sheath and the high heat insulation layer and are symmetrically arranged around the axis of the optical cable;
the cross section of the reinforcing member is arched, the outer side of the arched reinforcing member is convexly embedded into the inner wall of the outer sheath, and the inner side of the arched reinforcing member is arc-shaped and tangent to the outer surface of the high heat insulation layer;
and insulating epoxy resin is filled between the outer sheath and the high heat insulation layer to form an insulating filling layer.
2. The lightning protection optical cable of claim 1,
a wrapping tape is wrapped outside the core wire to form a wrapping tape layer;
composite filler is filled between the water-blocking inner sheath and the belting layer; the composite filler is prepared from sepiolite powder, cyclic phosphate ester epoxy resin, a P-C-N flame-retardant system and deionized water in a mass ratio of 1: (0.9-1.15): (3.5-4.5): (1.2-2.0) in the ratio of the above components.
3. The lightning protection optical cable of claim 1,
the high thermal insulation layer is made of GFRP material.
4. The lightning protection optical cable of claim 1,
the mass ratio of the insulating epoxy resin is 1: (3.8-4.15) ScotchcastTM#281 Electrical insulating resin and ScotchcastTM#9 electric insulating resin.
5. The lightning protection optical cable of claim 1,
a pair of discharge components are embedded in the outer sheath;
the outer end of the discharge component is embedded in the outer sheath, and the inner end of the discharge component penetrates through the insulating filling layer and is tangent to the outer side wall of the high heat insulation layer.
6. The lightning protection optical cable of claim 5,
the discharge component is prepared from CFRP materials.
7. The lightning protection optical cable according to claim 5 or 6,
a lightning protection component is embedded in the outer sheath;
the lightning protection member is disposed between the reinforcing member and the discharge member.
8. The lightning protection optical cable of claim 7,
the outer end of the lightning protection component is embedded in the outer sheath, and the inner end of the lightning protection component penetrates through the insulating filling layer and is tangent to the outer side wall of the high heat insulation layer.
9. The lightning protection optical cable of claim 7,
the lightning protection component is made of CFRP materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010448656.5A CN111580229B (en) | 2020-05-25 | 2020-05-25 | Lightning protection optical cable |
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| CN202010448656.5A CN111580229B (en) | 2020-05-25 | 2020-05-25 | Lightning protection optical cable |
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| CN113851270B (en) * | 2021-09-08 | 2023-11-28 | 富通集团（嘉善）通信技术有限公司 | Identifiable snow-proof optical cable |
| CN114706179B (en) * | 2022-04-06 | 2023-09-01 | 富通集团（嘉善）通信技术有限公司 | Wind-light-resistant cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5131064A (en) * | 1991-02-19 | 1992-07-14 | At&T Bell Laboratories | Cable having lightning protective sheath system |
| WO2008130918A2 (en) * | 2007-04-16 | 2008-10-30 | General Cable Technologies Corporation | Loose tube fiber optic cable for harsh environments |
| CN204347323U (en) * | 2015-01-15 | 2015-05-20 | 东莞市特旺通信科技有限公司 | Central beam tube type communication optical cable |
| CN108205179A (en) * | 2018-03-06 | 2018-06-26 | 中天科技海缆有限公司 | Submarine optical fiber cable |
| CN210534393U (en) * | 2019-08-27 | 2020-05-15 | 苏州胜信光电科技有限公司 | Tensile lightning protection optical cable for base station iron tower |
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