CN101714433A - Method for twisting fibers in center of composite power cable conductor - Google Patents
Method for twisting fibers in center of composite power cable conductor Download PDFInfo
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- CN101714433A CN101714433A CN200910248866A CN200910248866A CN101714433A CN 101714433 A CN101714433 A CN 101714433A CN 200910248866 A CN200910248866 A CN 200910248866A CN 200910248866 A CN200910248866 A CN 200910248866A CN 101714433 A CN101714433 A CN 101714433A
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Abstract
The invention relates to a method for twisting fibers in the center of a composite power cable conductor, solving the lasting problem of arranging optical fiber in the center of the cable conductor, which is unsolved all along by technical staff in the field. The invention utilizes the conventional frame-type wire-twisting machine, twists compacted and molded fan-shaped conductor units into a round segment conductor by fan-shaped filming, and twists the optical fiber with a stainless steel sleeve into a space enclosed by the round segment conductor center at the same time, and sequentially arranges a semi-conductive shielding layer, a crosslinked polyethylene insulator, an insulated semi-conductive shielding layer, a metal sheath and a plastic sheath on the periphery of the round segment conductor to prepare a composite power cable. The invention has simple process flows and together successfully twists the optical fiber with the stainless steel sleeve in the conductor center of the cable core on a basis of unchanging the prior cable manufacture process flows so that the product reaches the aims of accurately realizing the online measurement of practical cable temperature rise, exerting the transmission capability of the cable to the maximum extent and ensuring the safe operation of a power cable line.
Description
Technical field
The present invention relates to a kind of processing method that the ultra-high voltage cross-linking polyethylene insulation composite power cable of thermometric optical fiber is set in conductor, particularly a kind of method of composite power cable conductor center twisting fibers of milliken conductor center of the stranded moulding that thermometric optical fiber is set directly at composite power cable.This method mainly prepares and is used for the sending out of online in real time temperature detection, joins, fails, the transmission forceful electric power electric energy of change, supply line, and the conductor center of the electric current that passes through big (tens peaces are to several kilo-amperes), voltage height (66V to 500kV and more than) is provided with the ultra-high voltage cross-linking polyethylene insulation composite power cable of optical fiber.
Background technology
Development and application along with the distributing optical fiber sensing technology, power department is the safe operation of guaranteeing the transmission forceful electric power electric energy in the power cable line, requirement utilizes thermometric optical fiber the cable in the whole circuit to be carried out the automatic monitoring of following safe operation: first, the online in real time temperature detection, so that the cable in the whole circuit is realized monitoring running state, monitor the febrile state of cable under different loads and varying environment temperature effectively, accumulate historical technical data, carry out the analysis of ampacity limit, can guarantee under the situation that is no more than cable permission operating temperature, bring into play the transmittability of the cable in the whole circuit to greatest extent, increase economic efficiency.The second, the aging monitoring found the local hot spot on the cable, in time takes cooling measure, delays the cable aging speed.Three, real time fail monitoring and warning is in time found destruction that extraneous factor causes in the cable running etc.But because of existing ultra-high voltage cross-linking polyethylene insulation composite power cable can not be put into the cable conductor center to thermometric optical fiber, so do not reach the purpose of desirable accurate measurement cable conductor temperature, whole circuit realized the running status requirement of monitoring automatically thereby can't satisfy.
The method to set up of the thermometric optical fiber of home and abroad cross-inked polyethylene power cable mainly contains following two kinds at present:
The first is arranged on the optical fiber of thermometric the outside of cable insulation.As Japanese patent application publication No.: 1990-144810,1994-148001,1994-181013,1994-181014,1994-181015; Korean Patent Publication No.: 2003-45864; Patent documentations such as Chinese patent application numbers 02241372.3,200410035010.5,200420021745.8,200420042337.0,200510009338.4,200720158148.3,200810010479.1,200820034047.X, the composite power cable that thermometric optical fiber is set that is disclosed all is the outer surface that optical fiber is arranged on cable with diverse ways, be arranged on the paddy district, gap between the cable insulation core or be arranged on cable insulation and cable metal sheath between, be attached to the surface of cable insulation.Calculate the temperature of cable conductor by the temperature of measuring cable outer surface, core surface or cable insulation surface.Be strapped in the optical fiber (Surface Mount optical fiber) of cable insulation surface owing to be subjected to the influence of cable external environment and the insulation screen of cable own, the real-time change situation that almost can't follow the tracks of load truly.The serviceability temperature that the conductor of power cable with cross-linked polyethylene insulation allows is set at 90 ℃, surpasses this temperature and can make the softening distortion of polyethylene, destroys the insulation system of cable; And depend primarily on the aging conditions of cross-linking polyethylene materials under high temperature action the useful life of cable; In the ideal case, optical fiber should be placed in the actual temperature of measuring cable as much as possible near the position of cable conductor more accurately.But, for the method for destroying cable insulation near the center of cable core conductor is unpractical.
It two is that thermometric optical fiber is arranged in the cable conductor.Optical fiber places in the cable conductor, and particularly the center of conductor can be measured the actual temperature of cable more accurately, and this is that those skilled in the art want to solve and a unsolved all the time difficult problem always.All know in theory thermometric optical fiber is put into the purpose that the cable conductor center can reach the temperature of desirable accurate measurement cable conductor, still, in fact be difficult to this ideal is come true.Its reason just is that prior art does not also possess the necessary condition of accurately measuring the cable actual temperature:
Condition one, intracardiac must the reservation placed the fixed space that optical fiber is not deformed in cable conductor.This headspace should make the conductor of cable in the process of moulding, the optical fiber that will have stainless steel sheath is together inserted the conductor center of cable core, also to guarantee to be provided with the relevant connection in laying at the construction field (site) of all each procedures, delivery test and the cable line that do not change the follow-up moulding of cable behind the optical fiber, the optical fiber in the headspace of conductor center is not damaged;
Condition two, when at the construction field (site) adjacent two sections cables being connected, the optical fiber in the headspace of conductor center can freely move, and more easily connect, and the serviceability of optical fiber is unaffected;
Condition three, in the outdoor terminal or GIS (gas-insulated switch station) terminal that install at the two ends of cable line, the optical fiber that is in high potential that is arranged in the headspace of conductor center is successfully guided to earth potential, and be drawn out to exterior of terminal in the terminal insulating sleeve at an easy rate and be connected with the optical fiber of test box.
Chinese patent application numbers 200710172197.7 discloses a kind of " high voltage power cable of composite fiber ", it is that a passage or a plurality of passage are set in cable conductor, and passage is to safeguard that by conduit conduit is that metal material and plastics are made, skin is a metal, and internal layer is plastics.Optical fiber is set in passage, and the length of optical fiber is greater than the length of passage.Optical fiber is type or snakelike distribution in the shape of a spiral in passage.This method is existing the introduction in " electric power overhead cable " literary composition of " communication of power system " (2002.3), and reaches on the optical cables such as " Optical Fiber composite overhead Ground Wire " in application conditionally at " optical power grounded waveguide " of electric aerial optical cable.Though the optical fiber that is placed in the passage can improve thermometric problem accurately to a certain extent,, make the stranding process of conductor moulding become complicated because it has changed the structure of cable conductor; When the cross-sectional area of conductor that the preparation same size requires, because of passage has taken the space of segment conductor, so the conductor diameter that makes strand make type increases.In order to satisfy the crooked needs of cable in manufacturing and process of deployment, the conductor of traditional power cable with cross-linked polyethylene insulation is generally by the very little stranded cylindrical conductor that is shaped to different cross section of round single line process multilayer of diameter, and after every layer of conductor is stranded, all to press, reduce the space between the circle single line in the stranded conductor, dwindle the diameter of stranded conductor, to save the consumption of conductor external structure material therefor.But, after being set in the conductor because of above-mentioned cable, passage just can not press, so make conductor diameter further enlarge, increased conductor consumption.The conductor manufacturing of cable is first procedure of cables manufacturing because the structural change of conductor, so that the manufacturing process of follow-up each procedure all must change; After the conductor diameter increase, constant for guaranteeing its insulation thickness, the insulation external diameter also will increase; Follow-up metallic sheath, the external diameter of plastic sheath all will increase.So not only make the structure consumption of cable material increase, strengthened the manufacturing cost of cable, and add optical fiber and the cable that does not add optical fiber can not be with same stranding process production, equipment utilization rate variance, operating efficiency are also low.In addition, entering the crosslinking temperature that cross-linking tube carries out after cross-linked polyethylene insulating material is extruded is 300 ℃, and cross-linking tube is generally vertical or dangles and is provided with downwards, and the plastics that are arranged on the conduit internal layer will melt along the conduit obstruction lower end conduit that trickles downwards; Because the increase of the outside diameter of cable, the size of connecting box, terminal that is connected with this cable line and the corresponding component that is mated all will change.Therefore, do not see up to now and process the report that the center at the cable core conductor with the channel design of not establishing is provided with the application of the high voltage power cable of thermometric optical fiber and this high voltage power cable.
Summary of the invention
The method that the purpose of this invention is to provide a kind of composite power cable conductor center twisting fibers, it has solved that those skilled in the art want to solve always and unsolved all the time optical fiber places the difficult problem at cable conductor center, its technological process is simple, on the basis that does not change the technological process of existing manufacturing cable, the optical fiber that successfully will have a stainless steel sheath together twists the conductor center into cable core, the conductor center of making is provided with composite power cable rational in infrastructure of optical fiber, optical fiber can freely move vertically, can not only satisfy the online in real time temperature detection of guaranteeing whole power cable line safe operation reliably, aging monitoring, the automatic monitoring requirement of real time fail monitoring and warning, and under the condition that does not change the relevant link structure of existing cable, install, can significantly improve construction operation efficient, reduce construction cost.
The technical solution adopted in the present invention is: the technical essential of the method for this composite power cable conductor center twisting fibers is to comprise following operating procedure:
At first utilize existing frame type stranding machine stranded and, stranded pressing of single round copper wire is shaped to 4-6 the sector conductor unit that shape is identical by fan-shaped pressing mold;
Secondly will press between two adjacent described sector conductor unit of moulding and separate with insulating paper strip, again the described sector conductor unit that separates with insulating paper strip is twisted into circular milliken conductor, meanwhile the optical fiber of band stainless steel sheath is twisted in the figurate space that described circular milliken conductor center surrounds together, and the optical fiber of described band stainless steel sheath is axially freely moved along it in described space;
Periphery at described circular milliken conductor sets gradually semiconductive shielding layer, crosslinked polyetylene insulated body, insulation semiconductive shielding layer, metallic sheath and plastic sheath at last, promptly makes the composite power cable that the conductor center is provided with optical fiber.
At least place one in the described stainless steel sheath in the central space of described circular milliken conductor and measure the optical fiber that conductor temperature that described conductor center is provided with the composite power cable of optical fiber changes.
The optical fiber of the band stainless steel sheath in the described circular milliken conductor central space, the end of the conductor connecting tube that is provided with between the composite power cable of optical fiber is set at interconnective two sections adjacent described conductor centers, draw between two adjacent sector elements, outside described conductor connecting tube, carry out welding.
When the optical fiber of the band stainless steel sheath in the described circular milliken conductor central space is provided with optical fiber at described conductor center composite power cable is connected with electric equipment, in described conductor center is provided with the space at lower end, described circular milliken conductor center of the conductor eduction rod that the composite power cable terminal of optical fiber is provided with, draw between two adjacent sector elements, guide to the position, place from high potential, guide to described terminal outside again in the insulating sleeve, be connected with the optical fiber of the temperature-controlled cabinet of described electric equipment.
The conductor center that the inventive method produces is provided with the composite power cable of optical fiber, its technical essential is: the composite power cable that described conductor center is provided with optical fiber adopts the milliken conductor structure, it comprises round conductor is divided into the identical described sector conductor unit of shape, separate with the insulation interlayer between adjacent two described sector conductor unit in the stranded circular milliken conductor that surrounds into, the optical fiber of band stainless steel sheath is inserted in the figurate space that described circular milliken conductor center surrounds, after all each operations of cables manufacturing, in the process that delivery test and cable are laid at the construction field (site), described space can not change or be out of shape.
Advantage and good effect that the present invention has are: because the inventive method is to utilize existing frame type stranding machine stranded and by fan-shaped pressing mold, the sector conductor unit that shape is identical is twisted into circular milliken conductor, meanwhile, the optical fiber of band stainless steel sheath is twisted in the figurate space that circular milliken conductor center surrounds together, and optical fiber is axially freely moved in this space along it, so its technological process is simple, on the basis that does not change the technological process of existing manufacturing cable, the optical fiber that successfully will have a stainless steel sheath together twists the conductor center into cable core, make the conductor center that produces that composite power cable rational in infrastructure of optical fiber is set, can satisfy the online in real time temperature monitoring of guaranteeing whole power cable line safe operation, aging monitoring, real time fail monitoring and warnings etc. are monitoring requirement automatically, can delay the cable aging speed, bring into play the transmittability of cable to greatest extent.Therefore, it has solved that those skilled in the art want to solve always and unsolved all the time optical fiber places the difficult problem at cable conductor center.In addition, because of the optical fiber that is stranded in the composite power cable conductor center can axially freely move along it in the headspace at this conductor center, so can under the condition of the relevant connection modular construction that does not change existing cable, install, composite power cable that these two sections conductor centers the are provided with optical fiber conductor connecting tube by corresponding connecting box is linked together or by corresponding outdoor terminal case or GIS termination rack outward, the optical fiber that is in high potential that is arranged in the headspace of conductor center is guided to earth potential, and in the terminal insulating sleeve, guide to the terminal outside, be connected with the optical fiber of the temperature-controlled cabinet of electric equipment, can significantly improve construction operation efficient, reduce construction cost.Just because of this, thus the present invention be easy to apply.
Description of drawings
Below in conjunction with accompanying drawing the present invention is further described.
Fig. 1 is the sectional view that conductor center that the present invention makes is provided with the composite power cable of optical fiber.
Fig. 2 is circular milliken conductor among Fig. 1 and the amplification sectional view that the optical fiber of its center band stainless steel sheath is set.
Sequence number explanation among the figure: the optical fiber of 1 sector conductor unit, 2 insulation interlayers, 3 semiconductive shielding layers, 4 crosslinked polyetylene insulated bodies, 5 insulation semiconductive shielding layers, 6 metallic sheaths, 7 plastics oversheaths, 8 band stainless steel sheaths.
Embodiment
Describe concrete structure of the present invention in detail according to Fig. 1～2.The method of the conductor center twisting fibers of this composite power cable is owing to being to adopt existing equipment and cable twisting technology commonly used, so can be easy to process the product that meets existing ultra-high voltage cross-linking polyethylene-insulated power cable standard code.Briefly be exactly that the cross section that produces of the inventive method surpasses the composite power cable that 800 square millimeters conductor center is provided with optical fiber and adopts the milliken conductor structure.It comprises round conductor is divided into 4-6 the sector conductor unit 1 that shape is identical, separate with insulation interlayer 2 between adjacent two sector conductor unit 1 in the stranded circular milliken conductor that surrounds into, simultaneously the optical fiber 8 of band stainless steel sheath is twisted to go in the figurate space that circular milliken conductor center surrounds together.Automatically form the fixed space of an approximate 4-6 limit shape at the center of circular milliken conductor.Effective inscribe diameter of a circle in this polygon space approximately can reach 3-4 millimeter (see figure 2), after all other each operations, delivery test and the cable of the cables manufacturing process of laying at the construction field (site) in, the space that this conductor center is provided with the composite power cable of optical fiber can not change or be out of shape.
The method of composite power cable conductor of the present invention center twisting fibers comprises following operating procedure in detail:
At first utilize existing frame type stranding machine stranded and, stranded pressing of the single round copper wire of diameter 2-4 millimeter is shaped to 4-6 the identical cross section of shape and is fan-shaped conductor element 1 by fan-shaped pressing mold.
Secondly will above-mentionedly press between two adjacent sector conductor unit 1 of moulding and separate, again the sector conductor unit 1 that separates with the interlayer 2 that insulate will be twisted into circular milliken conductor on the disc type stranding machine with the interlayer 2 that insulate.
The concrete grammar of stranded circular milliken conductor is as follows: the pay off rack that needs quantity is set on the disc type stranding machine, divides two alignment prefaces to arrange; With the center line of shaping mould device at an angle; Each pay off rack has insulation barrier paper tep reel; What place successively is shaping mould device, rotatable take-up stand, band device.The front portion of shaping mould device is a broadening formation, and the rear portion is cylindrical.The drum of agreeing mutually that twines sector conductor unit 1 is placed on the pay off rack of arranging in order on both sides.The optical fiber of take-up strap stainless steel sheath holds drum and is placed on the middle fixedly pay off rack of two discharging coil holders.The pay off rack that holds drum that twines sector conductor unit 1 can rotate by certain angle, all be inwardly most advanced and sophisticated when making each sector conductor unit 1 enter round-formed pattern, arc surface is outside, the optical fiber 8 of take-up strap stainless steel sheath holds the front that drum is placed on round-formed pattern device, and the center that optical fiber holds drum, guide roller, guiding plug and shaping mould point-blank.The guide roller top edge hold wire casing, the guiding plug is concentric with shaping mould, the guiding plug is hollow, front end is taper, the optical fiber 8 of band stainless steel sheath passes from guiding the plug center.The twisting pitch that take-up stand is set by sector conductor unit 1 laterally rotates, take-up reel on the take-up stand then enters round-formed pattern by the optical fiber 8 of the vertical rotation traction traction sector conductor of linear velocity unit of setting 1 and band stainless steel sheath by guide roller, guiding plug, is twisted into circular milliken conductor.The front end of taper enters in the round-formed pattern horn mouth to columniform edge, make sector conductor unit 1 when forming circular milliken conductor, middle space has formed same size and the fixing space of planform, meanwhile, the optical fiber 8 of band stainless steel sheath is twisted to go in the figurate space that circular milliken conductor center surrounds together, decapacitation is avoided being sandwiched in the slit of two sector conductor unit 1 and is damaged, and the optical fiber 8 of band stainless steel sheath is axially freely moved along it in above-mentioned space.2 cores commonly used or the stainless steel sheath diameter of 4 core fibres are the 1.5-2 millimeter, put into this figurate space and can not be squeezed or damage.In the stainless steel sheath in the central space of above-mentioned circular milliken conductor, can place one at least and can measure the optical fiber that the power cable with cross-linked polyethylene insulation conductor temperature changes.
At last by the subsequent handling of making cable usually, utilize the band device to set gradually semiconductive shielding layer 3, crosslinked polyetylene insulated body 4, insulation semiconductive shielding layer 5, metallic sheath 6 and plastics oversheath 7, promptly make the composite power cable that the conductor center is provided with optical fiber in the periphery of circular milliken conductor.
Because what the present invention adopted is the optical fiber 8 that the band stainless steel sheath is set in above-mentioned distinctive circular milliken conductor central space, optical fiber is axially freely moved along it in this space, so optical fiber can be provided with the end of the conductor connecting tube of the connecting box that is provided with between the power cable of optical fiber at interconnective two sections adjacent conductor centers, draw between two adjacent sector conductor unit 1, outside conductor connecting tube, carry out welding easily.In addition, when the composite power cable that also can make the optical fiber 8 of the band stainless steel sheath in the circular milliken conductor central space that optical fiber is set at the conductor center of said structure is connected with electric equipment, between the lower end of the conductor eduction rod of this power cable outdoor terminal or the setting of GIS terminal, two adjacent sector conductor unit, draw, guide to the position, place from high potential, guide to outdoor terminal or GIS terminal outside again in the insulating sleeve, be connected with the optical fiber of the temperature-controlled cabinet of electric equipment.
Claims (5)
1. the method for the conductor center twisting fibers of a composite power cable, it is characterized in that: comprise following operating procedure: at first utilize existing frame type stranding machine stranded and, stranded pressing of single round copper wire is shaped to 4-6 the identical cross section of shape and is fan-shaped conductor element by fan-shaped pressing mold;
Secondly will press between two adjacent described sector conductor unit of moulding and separate with insulating paper strip, again the described sector conductor unit that separates with insulating paper strip is twisted into circular milliken conductor, meanwhile the optical fiber of band stainless steel sheath is twisted in the figurate space that described circular milliken conductor center surrounds together, and the optical fiber of described band stainless steel sheath is axially freely moved along it in described space;
Periphery at described circular milliken conductor sets gradually semiconductive shielding layer, crosslinked polyetylene insulated body, insulation semiconductive shielding layer, metallic sheath and plastic sheath at last, promptly makes the composite power cable that the conductor center is provided with optical fiber.
2. the method for the conductor center twisting fibers of composite power cable according to claim 1 is characterized in that: place one in the described stainless steel sheath in the central space of described circular milliken conductor at least and measure the optical fiber that conductor temperature that described conductor center is provided with the composite power cable of optical fiber changes.
3. the method for the conductor center twisting fibers of composite power cable according to claim 1, it is characterized in that: the optical fiber of the band stainless steel sheath in the described circular milliken conductor central space, the end of the conductor connecting tube that is provided with between the composite power cable of optical fiber is set at interconnective two sections adjacent described conductor centers, draw between two adjacent sector conductor unit, outside described conductor connecting tube, carry out welding.
4. the method for the conductor center twisting fibers of composite power cable according to claim 1, it is characterized in that: when the optical fiber of the band stainless steel sheath in the described circular milliken conductor central space is provided with optical fiber at described conductor center composite power cable is connected with electric equipment, the lower end of the conductor eduction rod that the composite power cable terminal of optical fiber is provided with is set at described conductor center, draw between two adjacent sector conductor unit, guide to the position, place from high potential, guide to described terminal outside again in the insulating sleeve, be connected with the optical fiber of the temperature-controlled cabinet of described electric equipment.
5. the conductor center that produces of the method for the conductor center twisting fibers of a composite power cable according to claim 1 is provided with the composite power cable of optical fiber, it is characterized in that: the composite power cable that described conductor center is provided with optical fiber adopts the milliken conductor structure, it comprises round conductor is divided into the identical described sector conductor unit of shape, separate with the insulation interlayer between adjacent two described sector conductor unit in the stranded circular milliken conductor that surrounds into, the optical fiber of band stainless steel sheath is inserted in the figurate space that described circular milliken conductor center surrounds, after all each operations of cables manufacturing, in the process that delivery test and cable are laid at the construction field (site), described space can not change or be out of shape.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102254625A (en) * | 2011-04-25 | 2011-11-23 | 北京海通荣盛科技有限公司 | Production method and equipment of bunched optical cable |
| CN102468008A (en) * | 2010-11-16 | 2012-05-23 | 杭州华新电力线缆有限公司 | Polyphase electric optical fiber composite power cable |
| CN102751029A (en) * | 2012-06-14 | 2012-10-24 | 金杯电工衡阳电缆有限公司 | Molded conductor flexible metal armored optical cable composite power cable |
| CN103354129A (en) * | 2013-07-04 | 2013-10-16 | 晶锋集团股份有限公司 | Copper alloy armored composite cable |
| CN103943216A (en) * | 2014-04-26 | 2014-07-23 | 芜湖航天特种电缆厂 | Anti-bite isolated cable |
| CN104332241A (en) * | 2014-11-24 | 2015-02-04 | 无锡江南电缆有限公司 | Combined split conductor |
| CN104361949A (en) * | 2014-11-24 | 2015-02-18 | 无锡江南电缆有限公司 | Split conductor with optical fibers internally installed in fan-shaped center |
| CN105321620A (en) * | 2015-10-23 | 2016-02-10 | 无锡市长城电线电缆有限公司 | 500kV crosslinked polyethylene insulated optical fiber power cable for temperature measurement |
| CN109741872A (en) * | 2018-12-27 | 2019-05-10 | 远东电缆有限公司 | Magnetic-levitation traffic earthed system cable and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102468008A (en) * | 2010-11-16 | 2012-05-23 | 杭州华新电力线缆有限公司 | Polyphase electric optical fiber composite power cable |
| CN102254625A (en) * | 2011-04-25 | 2011-11-23 | 北京海通荣盛科技有限公司 | Production method and equipment of bunched optical cable |
| CN102751029A (en) * | 2012-06-14 | 2012-10-24 | 金杯电工衡阳电缆有限公司 | Molded conductor flexible metal armored optical cable composite power cable |
| CN102751029B (en) * | 2012-06-14 | 2014-07-09 | 金杯电工衡阳电缆有限公司 | Molded conductor flexible metal armored optical cable composite power cable |
| CN103354129A (en) * | 2013-07-04 | 2013-10-16 | 晶锋集团股份有限公司 | Copper alloy armored composite cable |
| CN103354129B (en) * | 2013-07-04 | 2016-07-06 | 晶锋集团股份有限公司 | One Albatra metal armouring composite cable |
| CN103943216A (en) * | 2014-04-26 | 2014-07-23 | 芜湖航天特种电缆厂 | Anti-bite isolated cable |
| CN104332241A (en) * | 2014-11-24 | 2015-02-04 | 无锡江南电缆有限公司 | Combined split conductor |
| CN104361949A (en) * | 2014-11-24 | 2015-02-18 | 无锡江南电缆有限公司 | Split conductor with optical fibers internally installed in fan-shaped center |
| CN105321620A (en) * | 2015-10-23 | 2016-02-10 | 无锡市长城电线电缆有限公司 | 500kV crosslinked polyethylene insulated optical fiber power cable for temperature measurement |
| CN109741872A (en) * | 2018-12-27 | 2019-05-10 | 远东电缆有限公司 | Magnetic-levitation traffic earthed system cable and its manufacturing method |
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Open date: 20100526 |