CN104464941A - Novel insulated cable - Google Patents
Novel insulated cable Download PDFInfo
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- CN104464941A CN104464941A CN201410825975.8A CN201410825975A CN104464941A CN 104464941 A CN104464941 A CN 104464941A CN 201410825975 A CN201410825975 A CN 201410825975A CN 104464941 A CN104464941 A CN 104464941A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The invention provide a novel insulated cable which is high in fire-resistant performance, high in overload protecting capacity, high in working temperature, high in anti-radiation capacity and excellent in shielding performance. The novel insulated cable comprises at least one cable core conductor, fire-resistant layers, insulating layers, oxygen-barrier layers, wrapping layers and filling layers, wherein each cable core conductor is formed by winding at least two aluminum alloy cable cores, each fire-resistant layer is a double-sided flourophlogopite belt, each insulating layer is a ceramic fire-resistant composite belt, each oxygen-barrier layer is a ceramic fire-resistant composite belt, each wrapping layer is a vitreous fiber belt, each filling layer is made of vitreous fibers, at least one fire-resistant layer and at least one insulating layer are sequentially wound outside each cable core conductor, the cable core conductors form an overall cable core, at least one oxygen-barrier layer and at least one wrapping layer are sequentially wound outside the overall cable core, and the space between the cable core conductors and the space between the overall cable core and the oxygen-barrier layers are filled with the filling layers.
Description
Technical field
The present invention relates to a kind of improvement of cable, particularly the novel high flame retardant insulated flame-resistant cable of one.
Background technology
In the 60 to 70's, global copper valency is soaring at a high speed, and due to political factor, copper material is subject to restraint of trade as strategic materials, and domestic a large amount of employing aluminium is as the primary conductor material of power transmission cable, and " with aluminium for copper " becomes the technical policy that electric utility is generally followed.So the main line of civil buildings, branch line all adopts fine aluminium cable.And the shortcoming of fine aluminium conductor is mainly reflected in following several aspect: 1, bad mechanical strength, easily fracture, easy creep; 2, frequent holding screw is needed; 3, easily transship heating, there is potential safety hazard; 4 well do not solve copper-aluminium transition connectivity problem.These problems are not only domestic problems faced, and world's cable industry also faces same problem.
In addition, conventional mineral insulated cable also has the following disadvantages: 1, first its sheath have employed copper sheath, and copper consumption increases therefore production cost increases.2, the cable of larger cross-section or harder, flexibility is inadequate, and therefore more heavy in section (is greater than 400mm
2) there is no method production, the requirement of system high-current can not be met.
According to the requirement of experiment that MTR of Britain specifies, in process of the test, the sample of conventional mineral insulated cable is by burning and spraying the experiment in these two stages, when bending 180 ° of shock point, the copper sheath of conventional mineral insulated cable at bending point place along weld cracking, cracking length more than 10cm, and can see that gold mica tape is burnt till black powder, continues to do the impact experiment impacting once every 30 seconds, continue 15 minutes subsequently to bending point.The crackle of conventional mineral insulated cable copper sheath at bending point place is larger, the phlogopite severe detachment at cracking place, surveys insulation display 0M Ω.By the after-applied 750V voltage of sample in water after impact.Conventional mineral insulated cable sample is due to jacket surface cracking and short circuit cannot by this test.
Show from the sample observation test and final result of the test, under the condition that conventional mineral insulated cable burn at continuous high temperature, the phlogopite playing insulation and resistance to fire action can be Powdered coming off, and glass wool cloth can hardeningly become fragile.Caused by its design feature, between sheath and insulating barrier, there is sizable space, for the mica powder come off provides space, be very easy to cause electric short circuit like this under the percussion of external force.And the insulating barrier of this cable does not possess the such ceramic fireproof composite band insulating barrier of high flame retardant refractory mineral insulated cable, so its explosion-proof performance is not good enough yet, fuel gas, gasoline, steam etc. all can propagate into by cable cover(ing) and the space of insulating barrier electric equipment that cable is connected or other have the region of requirement of explosion proof, so in some important places, as fire-fighting system etc., should careful selection.In addition, produce overvoltage if unexpected in traditional cable use procedure, because sheath selection is improper, conventional mineral insulated cable just again cannot recover its electric property once breakdown, can only scrap.
Summary of the invention
For deficiency of the prior art, the present invention aims to provide that a kind of fire resistance is high, overload protection ability is strong, working temperature is high, capability of resistance to radiation is strong and the high flame retardant hot-face insulation cable that shielding properties is superior.
In order to solve the problem, this kind of Novel fire-resistant insulated cable, comprising: at least one core conductor, flame retardant coating, insulating barrier, oxygen barrier layer, coating layer and packed layer;
Every root core conductor is entwined by least two aluminium alloy cores; This flame retardant coating is two-sided fluorophlogopite belt; This insulating barrier is the fire-resistant composite band of ceramic; Oxygen barrier layer is the fire-resistant composite band of ceramic; Coating layer is vitreous fabric strip; Packed layer is vitreous fiber;
Every root core conductor is wound with at least one deck flame retardant coating and insulating barrier outward successively, each core conductor forms overall cable core, this overall cable core is wound with at least one deck oxygen barrier layer and coating layer outward successively, is provided with packed layer between each core conductor and between overall cable core and oxygen barrier layer.
Preferably, be provided with metal armor layers outside described coating layer, this metal armor layers is interlocked by aluminum alloy strip and is entwined.
Preferably, described aluminum alloy strip belt body side is provided with flange, and opposite side is provided with groove, and when being wound around, flange snaps in groove and forms interlocking structure.
More preferably, polyolefin flame-retardant sheath is provided with outside described metal armor layers.
Preferably, described core conductor by model is: the aluminium alloy of A8030 is formed; Described metal armor layers by model is: the aluminium alloy of 5052H24 is formed.
Preferably, the fire-resistant composite band of described ceramic is rolled by fire-resisting ceramic silicone rubber and glass fabric to be composited.
Preferably, every root core conductor is entwined by 1 to 61 aluminium alloy core; Described overall cable core is made up of 1 to 5 core conductor.
The invention has the beneficial effects as follows:
1, refractory standard is by BS6387 tri-examination: namely do not puncture under 950 DEG C of 3h flames, 650 DEG C of 30min consequences are by the Water spray (direct immersion also can) of 15min, bear the percussion vibration of 15min under 950 DEG C of flames and do not destroy, fire-retardant IA level, fire-resistant IA level can be realized, and low smoke and zero halogen, thus on fire resistance, reach the appraisal standards of mineral insulated cable completely.
Can poling separately when 2, laying, there is waterproof, protecting against shock function.
3, there is good protection against rodents, anti-ant, radiation proof function, can ensure that cable has stability, life-span length and durability.
4, working temperature is low, line loss is little, anti-overload ability is strong, and long service life, fail safe are high, in the project having environmental requirement, be especially applicable to application.
5, explosion-proof---the cable termination that the insulating material of height compacting in cable and special sealing shroud are installed can stop steam, gas and flame to enter the electric equipment be connected with cable, is thus practically applicable to the line of the place of explosion hazard and various antiknock device, equipment.
6, corrosion-resistant---the metal armor layers of high flame retardant refractory mineral insulation halogen-free low-smoke polyolefin jacket power cable has highly corrosion resistant because with the addition of rare earth composition, and for most device, it does not need the safeguard procedures of taking to add; Even if subject at the metallic sheath of cable the place that chemicals corrodes or industrial pollution is serious, because cable outermost layer has the protection of halogen-free and low-smoke flame-retardant polyolefin oversheath, it is safety still.
7, mechanical strength is high---and high flame retardant mineral insulation low smoke, zero halogen polyolefin jacket power cable is sturdy and durable, it interlocks sheathed structure continuously, there is shock resistance, anti-extrusion is indeformable, still can normally work when cable size distortion 1/3rd, even if stand violent mechanical damage, also its electrical property can not be damaged.
8, light flexibility---compared with copper core cable, traditional mineral insulated cable, this product has lightweight advantage, can reduce workmen's cost, accelerating construction progress, and has the feature of protection against the tide and soft pliable song.
Accompanying drawing explanation
Fig. 1 is the cross section structure schematic diagram of hot-face insulation cable of the present invention;
Fig. 2 is the partial cross structural representation of hot-face insulation cable of the present invention;
Fig. 3 is the decomposition texture schematic diagram of the metal armor layers of hot-face insulation cable of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further.
Composition graphs 1 and Fig. 2, Novel fire-resistant insulated cable of the present invention, this cable comprises: at least one core conductor 1, every root core conductor outer cladding or be wound with flame retardant coating 2 and insulating barrier 3, whole cable core outer cladding or be wound with oxygen barrier layer 4 and coating layer 5, is provided with packed layer 6 between each core conductor 1 and between overall cable core and oxygen barrier layer 4.Every root core conductor 1 is entwined by least two aluminium alloy cores, and this kind of aluminium alloy core preferred type number is: A8030.
Contrast AA-8030 aluminium alloy conductor and copper conductor, find the difference due to resistivity, their IACS is different, and AA-8030 aluminium alloy is 61.8% of copper, when we the sectional area of aluminium alloy conductor increased two grades or bring up to copper conductor sectional area 150% time, its electric property is consistent.Tensile strength, aluminium alloy conductor only has the half (113.8:220MPa) of copper conductor, density due to AA-8030 aluminium alloy only has 30.4% of copper conductor, even if thus aluminium alloy conductor sectional area brings up to 150% of copper conductor sectional area, the weight of aluminium alloy conductor also only has 45% of copper conductor, this advantage making the tensile strength of aluminium alloy conductor certain in addition relative to copper conductor.The surrender of AA-8030 aluminium alloy conductor close to copper conductor, thus makes the croop property of croop property close to copper conductor of aluminium alloy conductor.On elongation at break, aluminium alloy conductor and copper conductor are substantially identical.Because the coefficient of expansion of aluminium alloy conductor and copper conductor is different, copper conductor should not be directly connected with aluminium alloy conductor.We ensure the reliability connected in the following way.
Contrast A-8030 series conductor and fine aluminium A-1350 conductor, owing to adding copper/iron/magnesium elements, these elements play very crucial effect in the alloy:
Copper: increase the resistance stability of alloy when high temperature;
Iron: creep resistance improves 280% with compression property, avoids the relaxation problem because creep causes;
Magnesium: under same interfacial pressure, can improve contact point and have higher tensile strength.
(1) mechanical strength, upper as can be seen from table, compare with AA-1350 fine aluminium conductor, the tensile strength of AA-8030 series conductor is about 150% of fine aluminium, and yield strength is about 200% of fine aluminium;
(2) creep-resistant property is passing through in the creep test of 500 hours, and can see, compare with AA-1350 fine aluminium conductor, the creep-resistant property of AA-8030 series alloy is about 280% of fine aluminium, substantially reaches the level same with copper conductor;
(3) corrosion resistance, the antiseptic property that aluminium is intrinsic, originates from when aluminium surface contacts with air, the dense oxidation film that a layer thickness is about 2 ~ 4 μm can be formed immediately, this layer of oxide-film is very fine and close, the various forms of corrosion of special tolerance, thus has the characteristic of bearing most adverse circumstances; Show through the detection of the national detection departments such as Beijing Non-Ferrous Metal Research General Academy and case history data analysis, under chloride ion, seawater, marine atmosphere, salt mist environment (alternation of wetting and drying), saturated HzS, sulphur and high temperature, hyperbaric environment condition, the annual corrosion rate of rare earth aluminium alloy is zero or almost nil, in addition the optimization of alloy conductor inner material structure, and the application of thermal shrinkage type low-smoke halogen-free polyolefin insulating material, make the useful life of aluminium alloy cable than more than copper cable prolonged for another ten years.
This flame retardant coating 2 is preferably two-sided fluorophlogopite belt.This kind of synthetic mica tape manufactures with fluorophologopite raw material.The structural formula of phlogopite is: Kmg3 (AISi3O10) (OH) 2, the structural formula of fluorophologopite is: Kmg3 (AISi3O10) (OH) F2, from molecular structure, therebetween difference is that the former contains OH ion, the latter is containing F ion, its fluorinated volume is 8.89%, contains F ion, just make thermal endurance class increase substantially just because of in synthetic mica.Synthetic mica replaces hydroxyl, the synthetic mica that the size synthesized in atmospheric conditions is large, crystal formation is complete with fluorine ion.Synthetic mica tape is that synthetic mica to be copied the mica paper made be main material, then with adhesive, glass cloth is pasted onto one or both sides and makes.Glass cloth is pasted onto being called " one-side band " of mica paper one side, what two sides was all pasted cries " double-sided belt ".In the fabrication process, after several layer of structure is bonded together, then dry through stove, then rolling, then the belt cutting into different size.Synthetic mica tape is except having the characteristic of natural mica band namely: the coefficient of expansion is little, dielectric strength is large, resistivity is high and dielectric constant evenly except, its main feature is that thermal endurance class is high, the fire-resistant level of A level (950 1 1000 DEG C) synthetic mica tape heatproof can be reached and be greater than 1000 DEG C, thickness range at 0.08 ~ 0.15mm, maximum supply width 920mm.
This insulating barrier 3 is the fire-resistant composite band of ceramic, and oxygen barrier layer 4 is the fire-resistant composite band of ceramic.Ceramic fireproof composite band is rolled by ceramic fireproof silicon rubber and temperature resistant glass fiber cloth to be composited; start hardening under 650 DEG C and above flame or nonflame condition; reach as high as 3000 DEG C; along with temperature raises; rapidly by complete housing that Low fire ceramic shape is hard; the ablation time is longer, temperature is higher, housing is harder, and the stiff shell armouring after burning plays a very good protection to circuit, ensures that circuit power supply is in case of fire unimpeded.
This product density is less, only has 1.40-1.50g/ ㎝
3; Under normality, soft flexible, have tack, good airproof performance, nonhygroscopic, do not absorb water; Good mechanical performance, electrical insulation capability are excellent; Do not come off after burning, refractory temperature is high, fire resistance rating can reach the A grade standard of GB/T12666, and by the CWZ level Water spray of the BS 6387 of fireproof electric wire cable highest level in the world, vibrations, fire test; This product has white low cigarette, Halogen, without phosphorus nitrogen, heavy metal free, nontoxic, harmless, not melting, does not drip; Smog toxicity safe class reaches the most level of security ZA1 level of macromolecular material, can not cause secondary injury to human body; Meet European Union RoHS standard.Coating layer 5 is vitreous fabric strip (also known as halogen-free low-smoke high-flame fire insulation glass cloth band), and packed layer 6 is vitreous fiber.Be wound with at least one deck successively outside every root core conductor 1 and be wound with flame retardant coating 2 and insulating barrier 3, each core conductor 1 forms overall cable core, and this overall cable core is wound with at least one deck oxygen barrier layer 4 and coating layer 5 outward successively.As shown in Figure 3, the coating layer 5 of this kind of cable is outer also can be provided with metal armor layers 7, and this metal armor layers is interlocked by aluminum alloy strip and is entwined.Concrete, this aluminum alloy strip belt body side is provided with flange 71, and opposite side is provided with groove 72, and when being wound around, flange snaps in groove 72 and forms interlocking structure.This kind of metal armor layers by model is preferably: the aluminium alloy of 5052H24 is formed.
This kind of Novel high-conductivity alloy cable adopts self-locking mutual blocking armouring, and material is the alloy material of non-magnetic sexual type 5052H24 type series.Its special sheathed structure, for cable provides the maximum lateral pressure reaching 9000N/m.The maximum lateral pressure of existing band-armored is about 3000 ~ 4000N/ rice, and by contrast, its Novel high-conductivity alloy cable has stronger mechanical protection ability.Because of this kind of feature such as alloy cable is lightweight, mechanical strength is high, radius of turn is little and springback capacity is little, it has than copper core cable mounting means more flexibly.When number of cables is less, can adopt the mode along wall surface, only need the simple cable immobilization materials such as strain relief clamp, even if number of cables is more, the ladder that also only price need be used more cheap replaces crane span structure.Compared with copper core cable, save the expense of space and crane span structure.
Be wound around ceramic fireproof composite band again after the insulating material employing double-sided glass fiber reinforcement type mica tape multi-lay winding of this kind of cable, vitreous fabric strip is coated; winding armour is interlocked continuously through novel 5052H24 type aluminum alloy strip; extrude high-temperature hot miniature more halogen-free and low-smoke flame-retardant polyolefin sheathed; this product is produced through multilayer technology; can not puncture for 360 minutes under 950 DEG C of flame combustions, 1KV voltage, insulation resistance is not less than 1.0m Ω.Again detect up to 15KV high pressure through high-frequency spark machine in twisting process process, thoroughly stop potential safety hazard.Stranded complete after be wound around high flame retardant glass fiber tape while filling high flame retardant special material, recycling 5052H24 type aluminum alloy strip adopts interlocking winding process production metal armouring sheath continuously, finally extrude restrictive coating with the halogen-free and low-smoke flame-retardant polyolefin sheathed material of high temperature modification thermal shrinkage type, after multiple advanced technologies compound completes, cable both ensure that the security performance, anticorrosion, moistureproof of ground connection, interlocking winding process has again very high bending property, and construction and installation are very convenient, simple.
Preferably, the fire-resistant composite band of described ceramic is rolled by fire-resisting ceramic silicone rubber and glass fabric to be composited.Every root core conductor is entwined by 1 to 61 aluminium alloy core, and described overall cable core is made up of 1 to 5 core conductor.
New insulated cable of the present invention has following advantage to traditional cable relatively:
1, refractory standard is by BS6387 tri-examination: namely do not puncture under 950 DEG C of 3h flames, 650 DEG C of 30min consequences are by the Water spray (direct immersion also can) of 15min, bear the percussion vibration of 15min under 950 DEG C of flames and do not destroy, fire-retardant IA level, fire-resistant IA level can be realized, and low smoke and zero halogen, thus on fire resistance, reach the appraisal standards of mineral insulated cable completely.
Can poling separately when 2, laying, there is waterproof, protecting against shock function.
3, there is good protection against rodents, anti-ant, radiation proof function, can ensure that cable has stability, life-span length and durability.
4, working temperature is low, line loss is little, anti-overload ability is strong, and long service life, fail safe are high, in the project having environmental requirement, be especially applicable to application.
5, explosion-proof---the cable termination that the insulating material of height compacting in cable and special sealing shroud are installed can stop steam, gas and flame to enter the electric equipment be connected with cable, is thus practically applicable to the line of the place of explosion hazard and various antiknock device, equipment.
6, corrosion-resistant---the metal armor layers of high flame retardant refractory mineral insulation halogen-free low-smoke polyolefin jacket power cable has highly corrosion resistant because with the addition of rare earth composition, and for most device, it does not need the safeguard procedures of taking to add; Even if subject at the metallic sheath of cable the place that chemicals corrodes or industrial pollution is serious, because cable outermost layer has the protection of halogen-free and low-smoke flame-retardant polyolefin oversheath, it is safety still.
7, mechanical strength is high---and high flame retardant mineral insulation low smoke, zero halogen polyolefin jacket power cable is sturdy and durable, it interlocks sheathed structure continuously, there is shock resistance, anti-extrusion is indeformable, still can normally work when cable size distortion 1/3rd, even if stand violent mechanical damage, also its electrical property can not be damaged;
8, light flexibility---compared with copper core cable, traditional mineral insulated cable, this product has lightweight advantage, can reduce workmen's cost, accelerating construction progress, and has the feature of protection against the tide and soft pliable song.
It should be noted that; embodiment is only explanation to technical solution of the present invention and explanation; should not be understood as the restriction to technical solution of the present invention, any employing technical scheme of the present invention and only do local change, must fall within the scope of protection of the present invention.
Claims (7)
1. a Novel fire-resistant insulated cable, comprising: at least one core conductor (1), flame retardant coating (2), insulating barrier (3), oxygen barrier layer (4), coating layer (5) and packed layer (6);
Every root core conductor (1) is entwined by least two aluminium alloy cores; This flame retardant coating (2) is two-sided fluorophlogopite belt; This insulating barrier (3) is the fire-resistant composite band of ceramic; Oxygen barrier layer (4) is the fire-resistant composite band of ceramic; Coating layer (5) is vitreous fabric strip; Packed layer (6) is vitreous fiber;
Every root core conductor (1) is wound with at least one deck flame retardant coating (2) and insulating barrier (3) outward successively, each core conductor (1) forms overall cable core, this overall cable core is wound with at least one deck oxygen barrier layer (4) and coating layer (5) outward successively, is provided with packed layer (6) between each core conductor (1) and between overall cable core and oxygen barrier layer (4).
2. Novel fire-resistant insulated cable according to claim 1, is characterized in that: be provided with metal armor layers (7) outside described coating layer (5), and this metal armor layers is interlocked by aluminum alloy strip and is entwined.
3. Novel fire-resistant insulated cable according to claim 1, it is characterized in that: described aluminum alloy strip belt body side is provided with flange (71), opposite side is provided with groove (72), and when being wound around, flange snaps in groove (72) and forms interlocking structure.
4. the Novel fire-resistant insulated cable according to Claims 2 or 3, is characterized in that: be provided with polyolefin flame-retardant sheath (8) outside described metal armor layers (7).
5. Novel fire-resistant insulated cable according to claim 2, is characterized in that: described core conductor (1) by model is: the aluminium alloy of A8030 is formed; Described metal armor layers (7) by model is: the aluminium alloy of 5052H24 is formed.
6. Novel fire-resistant insulated cable according to claim 1, is characterized in that: the fire-resistant composite band of described ceramic is rolled by fire-resisting ceramic silicone rubber and glass fabric to be composited.
7. Novel fire-resistant insulated cable according to claim 1, is characterized in that: every root core conductor (1) is entwined by 1 to 61 aluminium alloy core; Described overall cable core is made up of 1 to 5 core conductor (1).
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Cited By (9)
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| CN104821195A (en) * | 2015-05-06 | 2015-08-05 | 宝胜科技创新股份有限公司 | Flexible fireproof cable |
| CN105513685A (en) * | 2016-01-28 | 2016-04-20 | 亚洲电器电缆科技有限公司 | Temperature-resistant fireproof environment-friendly cable for building |
| CN105719728A (en) * | 2016-04-05 | 2016-06-29 | 西部电缆股份有限公司 | Environment-friendly super-refractory flame-retardant flexible cable for communication power supply |
| CN106251973A (en) * | 2016-08-30 | 2016-12-21 | 武汉宏联电线电缆有限公司 | A kind of antiflaming DC united-hop fireproof control cable for track traffic |
| CN107103950A (en) * | 2017-06-29 | 2017-08-29 | 江苏华亚电缆有限公司 | A kind of environment-friendlymedium-voltage medium-voltage fireproof cable |
| CN108878008A (en) * | 2018-06-22 | 2018-11-23 | 江苏东峰电缆有限公司 | A kind of mineral insulated cable |
| CN109712749A (en) * | 2018-12-27 | 2019-05-03 | 深圳市合丰嘉大科技有限公司 | A kind of high voltage bearing flexible cable of high frequency tolerant and preparation method thereof |
| CN110504059A (en) * | 2019-08-30 | 2019-11-26 | 江西沪昌电缆有限公司 | The heat-resisting anti-aging cable insulation of one kind and its cable |
| CN111899924A (en) * | 2020-09-03 | 2020-11-06 | 瑞安市中德电工器材有限公司 | Corona-resistant enameled wire with high PDIV (polymer induced plasticity) and preparation process thereof |
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| CN106251973B (en) * | 2016-08-30 | 2017-12-08 | 武汉宏联电线电缆有限公司 | A kind of antiflaming DC united-hop fireproof control cable for track traffic |
| CN107103950A (en) * | 2017-06-29 | 2017-08-29 | 江苏华亚电缆有限公司 | A kind of environment-friendlymedium-voltage medium-voltage fireproof cable |
| CN108878008A (en) * | 2018-06-22 | 2018-11-23 | 江苏东峰电缆有限公司 | A kind of mineral insulated cable |
| CN109712749A (en) * | 2018-12-27 | 2019-05-03 | 深圳市合丰嘉大科技有限公司 | A kind of high voltage bearing flexible cable of high frequency tolerant and preparation method thereof |
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