CN106205820A - ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables - Google Patents
± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables Download PDFInfo
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- CN106205820A CN106205820A CN201610744856.9A CN201610744856A CN106205820A CN 106205820 A CN106205820 A CN 106205820A CN 201610744856 A CN201610744856 A CN 201610744856A CN 106205820 A CN106205820 A CN 106205820A
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- 239000004020 conductor Substances 0.000 title claims abstract description 59
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- 239000013307 optical fiber Substances 0.000 title claims abstract description 16
- 229910001369 Brass Inorganic materials 0.000 title claims abstract description 12
- 239000010951 brass Substances 0.000 title claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 76
- 239000010949 copper Substances 0.000 claims abstract description 42
- 229910052802 copper Inorganic materials 0.000 claims abstract description 42
- 239000000835 fiber Substances 0.000 claims abstract description 28
- 238000009413 insulation Methods 0.000 claims abstract description 27
- 239000004033 plastic Substances 0.000 claims abstract description 19
- 229920003023 plastic Polymers 0.000 claims abstract description 19
- 230000004888 barrier function Effects 0.000 claims abstract description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 229940079593 drug Drugs 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 description 16
- 239000000463 material Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000001125 extrusion Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229920001187 thermosetting polymer Polymers 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002674 ointment Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 238000004078 waterproofing Methods 0.000 description 1
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- Insulated Conductors (AREA)
- Communication Cables (AREA)
Abstract
The invention discloses one ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables, be combined copper strips screen layer, the second semiconductive water-blocking buffer layer, aluminium-plastic tape, insulation outer jacket and semi-conductive layer including heavy in section ladder-shaped conductor, conductor shield, insulating barrier, insulation screen, the first semiconductive water-blocking buffer layer, fiber unit, copper wire；Described heavy in section ladder-shaped conductor is formed by center core and outer layer trapezoidal copper monofilament layer-stranding, according to different conductor cross section demand, outer layer trapezoidal copper monofilament uses a circular copper single line or uses many circular single lines to press stranded circular core the most stranded outer 16 layers of SZ shape copper monofilament not etc..The present invention uses heavy in section ladder-shaped conductor, and conductor structure is stable, tight, and activity coefficient is not less than 93%, compares round compacted comductor or milliken conductor has less conductor diameter under identical current capacity, cable overall cost is greatly saved and puts into.
Description
Technical field
The present invention relates to a kind of cable, be ± heavy in section ladder-shaped the conductor of 500kV particularly to a kind of electric pressure
Brass wire shielding form Optical Fiber Composite direct current cables, the invention belongs to technical field of cable.
Background technology
Circuit cost is low, line loss is little, system stability because of it for Technology of HVDC based Voltage Source Converter, active power and reactive power
Control flexibly, reliable, facilitate the advantage such as built by separate periods and compatilizing mechanism to receive significant attention, join in isolated island power transmission, city
The fields such as the capacity-increasing transformation of electrical network, AC system interconnect, large-scale wind power field is grid-connected, and be widely used.
Flexible direct current cable is one of critical equipment of Technology of HVDC based Voltage Source Converter, and it is defeated that flexible DC power transmission avoids exchange
The kelvin effect of electric process and kindred effect, and flexible DC power transmission distance is longer, the continuous production of long length insulated wire cores
Advantageously reducing cables manufacturing cost, the most in most cases flexible direct current cable large size conductor does not the most use segmentation to lead
Bodily form formula.For cross section at 2000mm2Following flexible direct current sea cable conductor, presses circular stranded conductor and can meet its structure
Design and production requirement continuously, and effectively realize the longitudinal water-blocking of conductor, the most existing multinomial engineer applied.But when leading
Body section is more than 2000mm2, the most monofilament radical abilities that be can be done by by current conductor strand equipment are limited, and realize further
Increasing section can only rely on increase filament diameter, has easily caused monofilament gap compared with big and press the drawback that coefficient is less than normal, for rear
Continuous insulating exruded production brings bigger difficulty, and bigger conductor diameter causes the rising of cable holistic cost, therefore needs
The heavy in section water-blocking conductor of new structure to be developed adapts to higher transmission capacity and higher voltage grade flexible DC power transmission needs.
The main range of application of alternating current-direct current high voltage power cable concentrates on field of power transmission, by the construction of cable, manufacturing process and
The impact of capacity of equipment, is different from high-voltage undersea cable, the alternating current-direct current high voltage power cable of application in land ultra-high-tension power transmission line
The rarest Optical Fiber Composite product puts into application at present, is all to use optical cable and the side of electrical cables separate in traditional land transmission line of electricity
Formula completes communications or cable is implemented monitoring, therefore brings product cost, engineering difficulty and monitoring effect
Etc. the drawback of aspect.
Summary of the invention
Goal of the invention: the invention aims to solve deficiency of the prior art, it is provided that a kind of activity coefficient is higher,
Structure is more excellent, be conducive to long length quantity-produced form of conductors, and achieves fiber optic communication and the function and service of electric power transmission；
Provide a kind of with better function, production cost lower and reliable and practical ± 500kV flexible direct current cable product scheme, meet
The construction of country's DC transmission engineering needs, and is favorably improved the international competitiveness of China's power industry.
Technical scheme: one of the present invention ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite unidirectional current
Cable, including heavy in section ladder-shaped conductor, conductor shield, insulating barrier, insulation screen, the first semiconductive water-blocking buffer layer,
Fiber unit, copper wire are combined copper strips screen layer, the second semiconductive water-blocking buffer layer, aluminium-plastic tape, insulation outer jacket and half
Conductive layer；
Described heavy in section ladder-shaped conductor is externally provided with conductor shield, is externally provided with insulating barrier at conductor shield, at insulating barrier
It is externally provided with insulation screen, is externally provided with the first semiconductive water-blocking buffer layer at insulation screen, block water buffering at the first semiconductive
Layer is externally provided with copper wire and is combined copper strips screen layer, and being combined copper strips screen layer at copper wire has fiber unit, at fiber unit with layer is stranded
It is combined copper strips screen layer with copper wire and is externally provided with the second semiconductive water-blocking buffer layer, be externally provided with aluminum in the second semiconductive water-blocking buffer layer
Plastic composite strip, is externally provided with insulation outer jacket at aluminium-plastic tape, is externally provided with semi-conductive layer at insulation outer jacket；
Described heavy in section ladder-shaped conductor is formed by center core and outer layer trapezoidal copper monofilament layer-stranding, leads according to difference
Body section demand, center core uses a circular copper single line or uses many circular single lines to press stranded forming, centrage
The trapezoidal copper monofilament that the outer stranded 1-6 layer of core does not waits, the mode that trapezoidal copper single line uses base inside, long, short base outside is twisted
Close.
Further, described conductor shield is made up of semiconductive strapping tape and extrusion conductor shielding two parts, extrusion
Conductor shielding part and described insulation screen all use the unidirectional current with ultra-smooth performance, high conduction performance and thermosetting property
The special semiconductive material of cable is made, and described insulating barrier uses direct current cables special ultra-clean thermoset crosslink polyethylene Insulation Material system
Become.
Further, described first semiconductive water-blocking buffer layer and the second semiconductive water-blocking buffer layer are by two layer by layer or more
Multi-layered thickness is that the semi-conductive buffer water-blocking band of 2.0mm is wrapped to be made, and plays the effect of buffer protection and longitudinal water-blocking.
Further, the stranded rear outer layer in round copper wire gap that described copper wire is combined copper strips screen layer employing diameter homogeneous is reverse
Tying up copper strips to form, described fiber unit completes stranded together with round copper wire in being positioned over copper strips, requires that copper wire is combined time stranded
Copper wire overall distribution in copper strip shielding layer is uniform, and the round copper wire of every fiber unit both sides is close to fiber unit and is placed, with
The stainless steel tube external diameter of Shi Yaoqiu fiber unit is slightly less than round copper wire external diameter.
Further, described aluminium-plastic tape uses double-sided aluminum plastic composite band vertical bag outside the second semiconductive water-blocking buffer layer
After molding, bonding forms, and the aluminium-plastic tape after vertical bag leaves the part of putting up of one fixed width, uses the baking of baking the affected part after applying some drugs rifle to make to mould layer
Melt stickup, or used adhesive special to paste, after having pasted, form radially fluid-tight sealant.
Further, described semi-conductive layer selects semiconductive jacket material and insulation outer jacket disposable by double-deck extruder
Co-extrusion completes to produce, or uses coated with graphite outside insulation outer jacket.
Beneficial effect: volume of the present invention has the beneficial effect that:
(1) ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables uses heavy in section ladder-shaped conductor, leads
Body Stability Analysis of Structures, closely, activity coefficient is not less than 93%, compares round compacted comductor or segmentation is led under identical current capacity
Body has less conductor diameter, cable overall cost is greatly saved and puts into, this is external insert material water-proof material after also may be used
To obtain more excellent longitudinal water-blocking performance.
(2) ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables is that optoelectronic integration transmission provides
More efficient and scheme, the communication of implanted or the design of thermometric optical fiber cellular construction the most easily makes the guarantor of communications
Protecting with the temperature monitoring in cable running more effectively, save cable lays the construction cost with engineering simultaneously.
(3) ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables meets the great Rong of nowadays power grid construction
Amount transmission needs, and has filled up China's like product blank in this electric pressure, has significantly improved the technology of China's electrical circuitry equipment
Level and international competitiveness.
Accompanying drawing explanation
Fig. 1 is the construction of cable schematic diagram of the present invention.
Detailed description of the invention
One as shown in Figure 1 ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables, cuts including big
Face ladder-shaped conductor 1, conductor shield 2, insulating barrier 3, insulation screen the 4, first semiconductive water-blocking buffer layer 5, optical fiber list
Unit 6, copper wire are combined copper strips screen layer the 7, second semiconductive water-blocking buffer layer 8, aluminium-plastic tape 9, insulation outer jacket 10 and half
Conductive layer 11；
Described heavy in section ladder-shaped conductor 1 is externally provided with conductor shield 2, is externally provided with insulating barrier 3 at conductor shield 2, absolutely
Edge layer 3 is externally provided with insulation screen 4, is externally provided with the first semiconductive water-blocking buffer layer 5 at insulation screen 4, at the first semiconductive
Water-blocking buffer layer 5 is externally provided with copper wire and is combined copper strips screen layer 7, and being combined copper strips screen layer 7 at copper wire has fiber unit with layer is stranded
6, it is combined copper strips screen layer 7 at fiber unit 6 and copper wire and is externally provided with the second semiconductive water-blocking buffer layer 8, hinder at the second semiconductive
Water cushion 8 is externally provided with aluminium-plastic tape 9, is externally provided with insulation outer jacket 10 at aluminium-plastic tape 9, at insulation outer jacket 10 peripheral hardware
There is semi-conductive layer 11.
Described heavy in section ladder-shaped conductor 1 is formed by center core and outer layer trapezoidal copper monofilament layer-stranding, according to
Different conductor cross section demand, center core can be set at a circular copper single line or uses many circular single lines to press stranded
Form, the trapezoidal copper monofilament that core outer stranded 1-6 layer in center does not waits, base inside, long, the short base of stranded employing trapezoidal copper single line
Outside mode is carried out, if cable has longitudinal water-blocking requirement to conductor, can add the material that blocks water when monofilament is stranded in gap
Material, material water-proof material requires to select waterstop, water-proofing powder or block water according to different conductor processing technique and block-water performance
The different materials such as ointment.
Described conductor shield 2 is made up of semiconductive strapping tape and extrusion conductor shielding two parts.Extrusion conductor shielding
Part and described insulation screen 4 all use the direct current cables with ultra-smooth performance, high conduction performance and thermosetting property special
Semiconductive material is made, and described insulating barrier 3 uses direct current cables special ultra-clean thermoset crosslink polyethylene Insulation Material to make.
Described first semiconductive water-blocking buffer layer 5 and the second semiconductive water-blocking buffer layer 8 are by two-layer or more layers thickness
Make for the semi-conductive buffer water-blocking band of 2.0mm is wrapped, play the effect of buffer protection and longitudinal water-blocking.
Described fiber unit 6 uses the fiber unit of stainless steel structure, according to transmission need internal arrange different core number and
Different types of optical fiber, selects the stainless steel tube of different size according to fiber number, and rustless steel fiber unit radical can be according to reality
Border demand adjusts.
Copper wire is combined copper strips screen layer 7 and is reversely tied up copper strips by the stranded rear outer layer in the round copper wire gap that diameter is homogeneous and form,
Fiber unit 6 completes stranded together with round copper wire in being positioned over copper strips, require that copper wire is combined the copper in copper strips screen layer 7 time stranded
Silk overall distribution is uniform, and the round copper wire of every fiber unit both sides is close to fiber unit and is placed, and requires fiber unit simultaneously
Stainless steel tube external diameter is slightly less than round copper wire external diameter, in order to avoid fiber unit is by bigger side during cable production, installation etc.
Pressure causes damage.
Described aluminium-plastic tape 9 uses double-sided aluminum plastic composite band after the second outer longitudinal tubing of semiconductive water-blocking buffer layer 8
Bonding forms, and the aluminium-plastic tape after vertical bag leaves the part of putting up of one fixed width, uses the baking of baking the affected part after applying some drugs rifle to make to mould melting layer complete
Become to paste, or use adhesive special to paste, after having pasted, form radially fluid-tight sealant.
Described insulation outer jacket 10 preferentially uses polyethylene to become to produce by extruding molding mode, uses ring according to cable difference
The requirement in border, it is also possible to select have the material modified of the characteristic such as fire-retardant, weather-proof, outer jacket extrusion should immediately comprehensive waterproof
It is carried out continuously after the vertical bag of layer.
Described semi-conductive layer 11 can select semiconductive jacket material with insulation outer jacket by double-deck extruder disposably altogether
Squeeze production, it is possible to use coated with graphite is outside insulation outer jacket.
± 500kV flexible direct current cable has electric pressure height, transmission capacity is big, system design is complicated, use environment evil
Bad changeable, product manufacturing equipment and technological requirement are high, are the technological difficulties generally acknowledged of world's line cable industry and technology commanding elevation.This
The technical scheme of invention have employed one, and activity coefficient is higher, structure is more excellent, be conducive to long length quantity-produced form of conductors,
And achieve fiber optic communication and the function and service of electric power transmission.Provide a kind of with better function, production cost is lower and reliable
Practical ± 500kV flexible direct current cable product scheme, meet the construction needs of country's DC transmission engineering, be favorably improved me
The international competitiveness of state's power industry.
The above, be only presently preferred embodiments of the present invention, and the present invention not makees any pro forma restriction, though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any technology people being familiar with this specialty
Member, in the range of without departing from technical solution of the present invention, when the technology contents of available the disclosure above makes a little change or modification
For the Equivalent embodiments of equivalent variations, as long as being the content without departing from technical solution of the present invention, the technical spirit of the foundation present invention
Any simple modification, equivalent variations and the modification being made above example, all still falls within the range of technical solution of the present invention.
Claims (3)
1. one kind ± 500kV ladder-shaped conductor brass wire shielding Optical Fiber Composite direct current cables, it is characterised in that: include heavy in section
Ladder-shaped conductor (1), conductor shield (2), insulating barrier (3), insulation screen (4), the first semiconductive water-blocking buffer layer
(5), fiber unit (6), copper wire be combined copper strips screen layer (7), the second semiconductive water-blocking buffer layer (8), aluminium-plastic tape (9),
Insulation outer jacket (10) and semi-conductive layer (11)；
Described heavy in section ladder-shaped conductor (1) is externally provided with conductor shield (2), is externally provided with insulating barrier at conductor shield (2)
(3), it is externally provided with insulation screen (4) at insulating barrier (3), is externally provided with the first semiconductive water-blocking buffer layer at insulation screen (4)
(5), it is externally provided with copper wire in the first semiconductive water-blocking buffer layer (5) and is combined copper strips screen layer (7), be combined copper strips screen layer at copper wire
(7) there is fiber unit (6) with layer is stranded, be combined copper strips screen layer (7) at fiber unit (6) and copper wire and be externally provided with the second semiconductive
Water-blocking buffer layer (8), is externally provided with aluminium-plastic tape (9) in the second semiconductive water-blocking buffer layer (8), at aluminium-plastic tape (9) outward
It is provided with insulation outer jacket (10), is externally provided with semi-conductive layer (11) in insulation outer jacket (10)；
Described heavy in section ladder-shaped conductor (1) is formed, according to not by center core and outer layer trapezoidal copper monofilament layer-stranding
With cross-sectional area of conductor demand, center core uses a circular copper single line or uses many circular single lines to press stranded forming, in
The trapezoidal copper monofilament that the outer stranded 1-6 layer of heart core does not waits, the mode that trapezoidal copper single line uses base inside, long, short base outside is entered
Row is stranded.
One the most according to claim 1 ± 500kV SZ shape molded line conductor brass wire shielding Optical Fiber Composite direct current cables, its
It is characterised by: the stranded rear outer layer in round copper wire gap that described copper wire is combined copper strips screen layer (7) employing diameter homogeneous is reversely tied up
Copper strips forms, and described fiber unit (6) completes stranded together with round copper wire in being positioned over copper strips, requires copper wire complex copper time stranded
Copper wire overall distribution in band screen layer (7) is uniform, and the round copper wire of every fiber unit (6) both sides is close to fiber unit and is put
Put, require that the stainless steel tube external diameter of fiber unit is slightly less than round copper wire external diameter simultaneously.
One the most according to claim 1 ± 500kV SZ shape molded line conductor brass wire shielding Optical Fiber Composite direct current cables, its
It is characterised by: described aluminium-plastic tape (9) uses double-sided aluminum plastic composite band to indulge outward in the second semiconductive water-blocking buffer layer (8) and is bundled into
After type, bonding forms, and the aluminium-plastic tape after vertical bag leaves the part of putting up of one fixed width, uses the baking of baking the affected part after applying some drugs rifle to make to mould layer and melts
Change stickup, or used adhesive special to paste, after having pasted, form radially fluid-tight sealant.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610744856.9A CN106205820B (en) | 2016-08-29 | 2016-08-29 | The compound direct current cables of ± 500kV ladder-shaped conductor brass wire shielding optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610744856.9A CN106205820B (en) | 2016-08-29 | 2016-08-29 | The compound direct current cables of ± 500kV ladder-shaped conductor brass wire shielding optical fiber |
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| CN106205820A true CN106205820A (en) | 2016-12-07 |
| CN106205820B CN106205820B (en) | 2017-12-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107342136A (en) * | 2017-06-23 | 2017-11-10 | 中天科技海缆有限公司 | A kind of filled type jacket structure cable |
| CN108417301A (en) * | 2018-04-19 | 2018-08-17 | 远东电缆有限公司 | Water resistant tree power cable with cross-linked polyethylene insulation and production technology are pressed in one kind |
| CN111009353A (en) * | 2019-12-31 | 2020-04-14 | 杭州电缆股份有限公司 | B1-grade flame-retardant power cable and production process thereof |
| RU2799502C1 (en) * | 2022-08-18 | 2023-07-05 | Общество с ограниченной ответственностью "Инкаб" | Fiber optic communication cable |
| CN117954153A (en) * | 2024-03-15 | 2024-04-30 | 重庆科宝电缆股份有限公司 | Durable environmental protection type photovoltaic cable resistant to weather |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107342136A (en) * | 2017-06-23 | 2017-11-10 | 中天科技海缆有限公司 | A kind of filled type jacket structure cable |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106205820B (en) | 2017-12-29 |
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Address after: 226010 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Patentee after: Zhongtian Technology submarine cable Co.,Ltd. Address before: 226010 No. 1 South Road, Nantong economic and Technological Development Zone, Jiangsu, China Patentee before: ZHONGTIAN TECHNOLOGIES SUBMARINE CABLE Co.,Ltd. |
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Denomination of invention: +- 500kV trapezoidal conductor copper wire shielded fiber optic composite DC cable Granted publication date: 20171229 Pledgee: Bank of Jiangsu Co.,Ltd. Nantong Branch Pledgor: Zhongtian Technology submarine cable Co.,Ltd. Registration number: Y2024980005040 |
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