CN213211745U - Medium-voltage flexible cable - Google Patents
Medium-voltage flexible cable Download PDFInfo
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- CN213211745U CN213211745U CN202120792740.9U CN202120792740U CN213211745U CN 213211745 U CN213211745 U CN 213211745U CN 202120792740 U CN202120792740 U CN 202120792740U CN 213211745 U CN213211745 U CN 213211745U
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Abstract
The utility model provides a medium-voltage flexible cable, which comprises a conductor, a wrapped semi-conductive conductor shielding layer, an insulating layer, a wrapped semi-conductive insulating shielding layer, a metal shielding layer and an outer sheath, wherein the wrapped semi-conductive conductor shielding layer, the insulating layer, the wrapped semi-conductive insulating shielding layer, the metal shielding layer and the outer sheath are sequentially wrapped outside the conductor; the insulating layer is made of silicon rubber; the metal shielding layer is formed by weaving tinned copper wires and aramid fibers in a mixed mode. Because the silicon rubber is adopted, the temperature resistance level of the medium-voltage flexible cable is improved, the current-carrying capacity of the cable is obviously improved, and the transmission capacity of the medium-voltage flexible cable is further improved. And adopt around a package semiconduction conductor shielding layer and around a package semiconduction insulation shielding layer, break through the semiconductive conductor shielding layer and the semiconduction insulation shielding layer of extrusion type among the prior art, can effectual homogenization electric field and conduction leakage charge. In addition, the tinned copper wire can play a role in uniform electric field, and the aramid fiber wire can improve the flexibility of the metal shielding layer, so that the flexibility of the medium-voltage flexible cable is increased, and the bending performance of the medium-voltage flexible cable is improved.
Description
Technical Field
The utility model relates to the technical field of cables, especially, relate to a middling pressure flexible cable.
Background
As power usage increases, cables are required to have greater transmission capacity as a path for power transmission to ensure sufficient power supply.
The insulation layer material adopted by the existing medium-voltage flexible cable is generally crosslinked polyethylene or ethylene propylene rubber, the temperature resistance level is 90 ℃, the temperature resistance level is low, the transmission capacity of the cable is in direct proportion to the temperature resistance level of the insulation layer of the cable, and therefore the transmission capacity of the existing medium-voltage flexible cable is limited, and the transmission capacity of the existing medium-voltage flexible cable is small.
Disclosure of Invention
The utility model provides a middling pressure flexible cable for solve the defect that exists among the prior art.
The utility model provides a middling pressure flexible cable, include: the cable comprises a conductor, a wrapped semi-conductive conductor shielding layer, an insulating layer, a wrapped semi-conductive insulating shielding layer, a metal shielding layer and an outer sheath, wherein the wrapped semi-conductive conductor shielding layer, the insulating layer, the wrapped semi-conductive insulating shielding layer, the metal shielding layer and the outer sheath are sequentially wrapped outside the conductor; the insulating layer is made of silicon rubber; the metal shielding layer is formed by weaving tinned copper wires and aramid fibers in a mixed mode.
According to the utility model provides a pair of middling pressure flexible cable, for wrapping the semi-conductive special many tangential belt around package semi-conductive insulating shielding layer around package semi-conductive conductor shielding layer and/or around package semi-conductive insulating shielding layer.
According to the utility model provides a pair of middling pressure flexible cable, for wrapping the semi-conductive sticky tape around package semi-conductive conductor shielding layer and/or around package semi-conductive insulation shielding layer.
According to the utility model provides a pair of middling pressure flexible cable, the material of oversheath is low smoke and zero halogen polyolefin.
According to the utility model provides a pair of middling pressure flexible cable, the conductor is fifth kind of tinned conductor.
According to the utility model provides a pair of middling pressure flexible cable, the quantity of conductor is one or more.
According to the utility model provides a pair of middling pressure flexible cable, the metallic shield layer with still be equipped with ceramic silastic-rubber layer between the oversheath.
According to the utility model provides a pair of middling pressure flexible cable, the silicon rubber layer of pottery with still be equipped with the fine band layer of alkali-free glass between the oversheath.
According to the utility model provides a pair of middling pressure flexible cable, the metallic shield layer with still include between the oversheath: the outer insulating layer is formed by extruding ethylene propylene rubber.
The utility model provides a medium-voltage flexible cable, which comprises a conductor, a wrapped semi-conductive conductor shielding layer, an insulating layer, a wrapped semi-conductive insulating shielding layer, a metal shielding layer and an outer sheath, wherein the wrapped semi-conductive conductor shielding layer, the insulating layer, the wrapped semi-conductive insulating shielding layer, the metal shielding layer and the outer sheath are sequentially wrapped outside the conductor; the insulating layer is made of silicon rubber; the metal shielding layer is formed by weaving tinned copper wires and aramid fibers in a mixed mode. The insulating layer adopts silicon rubber, the long-term working temperature of the cable can reach 125 ℃, the temperature resistance level of the medium-voltage flexible cable is improved, the current-carrying capacity of the cable is obviously improved, the transmission capacity of the medium-voltage flexible cable is further improved, and the medium-voltage flexible cable can be applied to various high-power electric energy transmission systems. And owing to adopted around the package semiconduction conductor shielding layer and around the package semiconduction insulation shielding layer, broken through the semiconduction conductor shielding layer and the semiconduction insulation shielding layer of extruding the type among the prior art, can effectual homogenization electric field and conduction leak charge, solved the unable silicon rubber insulation problem of medium voltage flexible cable. In addition, the metal shielding layer is obtained by mixing and weaving tinned copper wires and aramid fibers, the tinned copper wires can play a role in uniform electric field, and the aramid fibers can improve the flexibility of the metal shielding layer, so that the flexibility of the medium-voltage flexible cable is increased, the bending performance of the medium-voltage flexible cable is improved, and the possibility of breaking the medium-voltage flexible cable is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a medium voltage flexible cable provided by the present invention;
fig. 2 is a schematic structural diagram of a medium voltage flexible cable provided by the present invention;
fig. 3 is a schematic structural diagram of a medium voltage flexible cable provided by the present invention;
fig. 4 is a schematic flow chart of a preparation method of the medium voltage flexible cable provided by the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Because the insulation layer material adopted by the existing medium-voltage flexible cable is generally crosslinked polyethylene or ethylene propylene rubber, the temperature resistance level is 90 ℃, the temperature resistance level is low, and the transmission capacity of the cable is in direct proportion to the temperature resistance level of the insulation layer of the cable, the transmission capacity of the existing medium-voltage flexible cable is limited, and the transmission capacity is small. Therefore, the embodiment of the utility model provides a middling pressure flexible cable.
Fig. 1 is a schematic structural diagram of a medium voltage flexible cable provided in an embodiment of the present invention, as shown in fig. 1, the medium voltage flexible cable includes: conductor 1, cladding in proper order is around 1 outer wrapping semi-conductive conductor shielding layer 2, insulating layer 3, around wrapping semi-conductive insulation shielding layer 4, metal shielding layer 5 and oversheath 6 of conductor. The insulating layer 3 is made of silicon rubber; the metal shielding layer is formed by weaving tinned copper wires and aramid fibers in a mixed mode.
Specifically, the material of the conductor 1 in the medium voltage flexible cable may specifically be copper, and may also be other conductive metals, which is not specifically limited in the embodiment of the present invention. The conductor 1 may be any one of a fifth conductor and a sixth conductor. The cladding has around package semi-conductive conductor shielding layer 2, insulating layer 3, around package semi-conductive insulation shielding layer 4, metal shielding layer 5 and oversheath 6 in the conductor 1 outside. The lapping semi-conductor shielding layer 2 is a semi-conductor shielding layer which is prepared on the outer side of the conductor 1 in a lapping mode and is used for realizing conductor shielding. Insulating layer 3 sets up in the outside around package semi-conductive conductor shielding layer 2 for to keeping apart around package semi-conductive conductor shielding layer 2 and around package semi-conductive insulation shielding layer 4. The lapped semiconductive insulation shielding layer 4 is a semiconductive insulation shielding layer which is prepared on the outer side of the insulation layer 3 in a lapped mode and is used for realizing insulation shielding. The material around package semi-conductive conductor shielding layer 2 and around package semi-conductive insulation shielding layer 4 specifically can be semi-conductive nylon area, semi-conductive extra-many tangential belt, semi-conductive buffering water-blocking area, semi-conductive water-blocking bandage area, semi-conductive butyl rubber buffering area, semi-conductive copper wire shielding area etc. the embodiment of the utility model provides an in not do not specifically limit to this.
The medium-voltage flexible cable is used for homogenizing the electric field on the surface of the conductor and conducting leaked charges so as to avoid the phenomenon of partial discharge caused by nonuniform electric field and charge accumulation, so that a semi-conductor shielding layer and a semi-conductive insulating shielding layer are required to be arranged, the extrusion temperature of the silicon rubber is low, and the semi-conductor shielding layer and the semi-conductive insulating shielding layer cannot be extruded at the same time, so that the silicon rubber material is limited to be applied to the medium-voltage flexible cable. Therefore the embodiment of the utility model provides an adopt around package semiconduction conductor shielding layer 2 and around package semiconduction insulation shielding layer 4, break through the semiconduction conductor shielding layer and the semiconduction insulation shielding layer of extruding the type among the prior art, this two-layer structure can effectual homogenization electric field and conduction leak electric charge, has solved the insulating problem of the unable silicon rubber of middling pressure flexible cable.
The embodiment of the utility model provides an in the insulating layer owing to adopted silicon rubber, the long-term operating temperature of cable can reach 125 ℃, has improved the temperature resistant rank of middling pressure flexible cable for the cable current-carrying capacity has apparent improvement. At 185mm2The cable of cross-section is for example, and conventional 90 ℃ temperature resistant grade cable current-carrying capacity is 444A, and the embodiment of the utility model provides a middling pressure flexible cable is 524A with cross-section cable current-carrying capacity, and the current-carrying capacity improves more than 18%, under equal cross-section and occupation space condition, can transmit higher energy. Moreover, the embodiment of the utility model provides an in middling pressure flexible cable through partial discharge test, the discharge capacity is no longer than 5 pc.
Because the metal shielding layer in the existing medium-voltage flexible cable is generally wrapped by a copper strip or woven by a copper wire, the bending performance of the wrapped copper strip is poor, and the requirement on the bending performance of the flexible cable is not met; the thickness of the overlapping part braided by the copper wire is large, and when stress exists outside the overlapping part, the pressure bearing strength of the insulating shielding and the overlapping contact part of the braid is large, so that an insulating system can be damaged. Therefore, the embodiment of the utility model provides an in the metal shielding layer adopt tinned copper wire and aramid fiber silk to mix to weave and obtain, improved the bending property of metal shielding layer, make it can satisfy the requirement of flexible cable bending property. Moreover, the medium-voltage flexible cable can be subjected to long-time winding dragging movement, and has extremely excellent tension resistance, and the characteristics of insulation voltage resistance, winding voltage resistance, wear resistance and the like. The damage of tensile force to the cable and the inner structure injury that the torsional force produced the spiral and caused can be resisted at reel coiling in-process, and the inhomogeneous phenomenon of insulating surface stress when having solved the cable and receiving pressure has avoided the insulation defect problem because pressure produces.
The embodiment of the utility model provides a medium-voltage flexible cable, including the conductor, wrap the semiconductive electric conductor shielding layer, insulating layer, wrap the semiconductive electric insulation shielding layer, metallic shield and oversheath that cladding in proper order outside the conductor; the insulating layer is made of silicon rubber; the metal shielding layer is formed by weaving tinned copper wires and aramid fibers in a mixed mode. The insulating layer adopts silicon rubber, the long-term working temperature of the cable can reach 125 ℃, the temperature resistance level of the medium-voltage flexible cable is improved, the current-carrying capacity of the cable is obviously improved, the transmission capacity of the medium-voltage flexible cable is further improved, and the medium-voltage flexible cable can be applied to various high-power electric energy transmission systems. And owing to adopted around the package semiconduction conductor shielding layer and around the package semiconduction insulation shielding layer, broken through the semiconduction conductor shielding layer and the semiconduction insulation shielding layer of extruding the type among the prior art, can effectual homogenization electric field and conduction leak charge, solved the unable silicon rubber insulation problem of medium voltage flexible cable. In addition, the metal shielding layer is obtained by mixing and weaving tinned copper wires and aramid fibers, the tinned copper wires can play a role in uniform electric field, and the aramid fibers can improve the flexibility of the metal shielding layer, so that the flexibility of the medium-voltage flexible cable is increased, the bending performance of the medium-voltage flexible cable is improved, and the possibility of breaking the medium-voltage flexible cable is reduced.
On the basis of the embodiment, the embodiment of the utility model provides a middling pressure flexible cable, for wrapping the semiconduction extra-many tangential belt around package semiconduction insulating shielding layer around package semiconduction conductor shielding layer and/or.
Specifically, the embodiment of the utility model provides an in specifically adopt around package semiconduction extra large dragon area as around package semiconduction conductor shielding layer and/or around package semiconduction insulation shielding layer, form around package semiconduction conductor shielding layer and/or around package semiconduction extra large dragon area around package semiconduction insulation shielding layer promptly, can improve the intensity and the holding capacity of middling pressure flexible cable.
On the basis of the embodiment, the embodiment of the utility model provides a middling pressure flexible cable, for wrapping the semiconduction sticky tape around package semiconduction conductor shielding layer and/or around package semiconduction insulation shielding layer.
Specifically, the embodiment of the utility model provides an in specifically adopt around the package semiconduction sticky tape as around package semiconduction conductor shielding layer and/or around package semiconduction insulation shielding layer, form around the package by the semiconduction sticky tape around the package promptly around package semiconduction conductor shielding layer and/or around package semiconduction insulation shielding layer, can even electric field, improve middling pressure flexible cable voltage resistance.
On the basis of the above embodiment, in the middle voltage flexible cable provided in the embodiment of the present invention, the material of the outer sheath is low smoke zero halogen polyolefin.
Particularly, the outer sheath is prepared from low-smoke halogen-free polyolefin, so that the medium-voltage flexible cable can not generate dense smoke at high temperature, the flame-retardant effect can be achieved, and a small amount of generated non-toxic and harmless gas can not cause secondary damage.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides a medium voltage flexible cable, the conductor is the fifth kind tinned conductor, compares in the sixth kind conductor and has stronger intensity under guaranteeing soft condition.
On the basis of the above embodiments, in the medium voltage flexible cable provided in the embodiments of the present invention, the number of the conductors is one or more.
The embodiment of the utility model provides an in middling pressure flexible cable, both can be single core flexible cable, also can be multicore flexible cable, the quantity of conductor can be one or more promptly. When the conductor is plural, the space between different conductors may be filled with the filler.
As shown in fig. 2, on the basis of the above embodiment, in the medium voltage flexible cable provided in the embodiment of the present invention, a ceramic silicone rubber layer 7 is further disposed between the metal shielding layer 5 and the outer sheath 6. When a fire disaster happens, the ceramic silicon rubber layer is heated and then is converted into a fire-resistant base layer with a ceramic structure, the internal structure of the ceramic silicon rubber layer is firmly wrapped, the oxygen-insulating and heat-insulating effects are achieved, the normal power supply is guaranteed, and valuable time is provided for escape and property rescue.
As shown in fig. 3, on the basis of the above embodiment, in the medium voltage flexible cable provided in the embodiment of the present invention, an alkali-free glass fiber tape layer 8 is further disposed between the silicon ceramic rubber layer 7 and the outer sheath 6, so as to further enhance the fire-resistant effect of the medium voltage flexible cable.
On the basis of the above embodiment, the embodiment of the utility model provides a middling pressure flexible cable, the metallic shield layer with still include between the oversheath: the outer insulating layer is formed by extruding ethylene propylene rubber, and can improve the insulating property, the waterproof property, the moisture resistance and the like of the medium-voltage flexible cable.
As shown in fig. 4, on the basis of the above embodiments, the preparation method of the medium voltage flexible cable provided in the embodiments of the present invention may include:
s1, preparing a conductor;
s2, wrapping a semi-conductive material outside the conductor to obtain a wrapped semi-conductive conductor shielding layer;
s3, extruding and vulcanizing silicon rubber on the outer side of the wrapped semi-conductive conductor shielding layer to obtain an insulating layer;
s4, wrapping a semi-conductive material on the outer side of the insulating layer to obtain a wrapped semi-conductive insulating shielding layer;
and S5, sequentially preparing a metal shielding layer and an outer sheath on the outer side of the wrapped semi-conductive insulating shielding layer.
Specifically, when preparing the medium-voltage flexible cable, step S1 is first performed to prepare a conductor. Then, step S2 is performed to wrap the semi-conductive material outside the conductor, so as to obtain a wrapped semi-conductive conductor shielding layer. Specifically, a semiconductive Teflon tape with the nominal thickness of 0.12mm can be lapped and wrapped in an overlapping mode, and the covering rate is controlled to be 25% -30%. And then executing step S3, extruding and vulcanizing silicon rubber outside the wrapped semi-conductive conductor shielding layer to obtain the insulating layer. The silicon rubber can be used for continuous vulcanization production, the nominal thickness is 3.4mm, the thinnest point is not less than 2.96mm, and the eccentricity is not more than 15%. Then, step S4 is performed to wrap the semiconductive material outside the insulating layer, so as to obtain a wrapped semiconductive insulating shield layer. Specifically, a semiconductive Teflon tape with the nominal thickness of 0.12mm can be lapped and wrapped in an overlapping mode, and the covering rate is controlled to be 25% -30%. Then, step S5 is performed to sequentially prepare a metal shielding layer and an outer sheath on the outer side of the wrapped semi-conductive insulating shielding layer. Specifically, a tinned copper wire and aramid fiber wire with the nominal diameter of 0.3mm can be mixed and woven on the outer side of the wrapped semi-conductive insulating shielding layer, the weaving density is controlled to be 82% -84%, and the metal shielding layer is prepared; the outer sheath is produced by extruding flexible low-smoke halogen-free polyolefin outside the metal shielding layer. The nominal thickness is 2.0mm, the thinnest point thickness is not less than 1.4mm, and the eccentricity is not more than 25%.
When the medium-voltage flexible cable is prepared, the insulating layer is obtained by extruding and vulcanizing silicon rubber, so that the long-term working temperature of the obtained medium-voltage flexible cable can reach 125 ℃, the temperature resistance level of the medium-voltage flexible cable is improved, the current-carrying capacity of the cable is obviously improved, the transmission capacity of the medium-voltage flexible cable is further improved, and the medium-voltage flexible cable can be applied to various high-power electric energy transmission systems. And owing to adopted the mode preparation around the package semi-conductive material to wind around the package semi-conductive conductor shielding layer and around the package semi-conductive insulation shielding layer, broken through and prepare semi-conductive conductor shielding layer and semi-conductive insulation shielding layer with the mode of extruding among the prior art, can effectual homogenization electric field and conduction leak electric charge, solved the unable silicon rubber insulation problem of medium voltage flexible cable.
On the basis of the above embodiment, when the conductor is prepared, the method specifically includes:
drawing a plurality of copper rods respectively, and plating tin on the surfaces of the obtained copper wires;
and twisting the tinned copper wires to obtain the conductor.
Specifically, when the conductor is prepared, a copper rod can be specifically adopted, a Nichhoff 16-head fine drawing machine is adopted to process the copper rod with the nominal diameter of 2.6mm into a copper wire with the nominal diameter of 0.4mm, then a hot-dip method is adopted to plate tin on the surface of the copper wire with the nominal diameter of 0.4mm, and the thickness of a tin layer can be 0.2-0.3 μm. And then, combining a preset number of tinned copper strands with nominal diameters of 0.4mm into a stranded wire, and regularly twisting the preset number of stranded wires into a conductor. The number of the preset strands can be 39, and the number of the preset strands can be 37, which is not specifically limited in the embodiment of the present invention. The conductor structure can be (1 +6+12+ 18) × 39/0.4mm, in order to ensure that the medium-voltage flexible cable has good bending performance, the twisting pitch-diameter ratio can be controlled to be 8-10 times, and the prepared conductor has higher strength and higher flexibility.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A medium voltage flexible cable, comprising: the cable comprises a conductor, a wrapped semi-conductive conductor shielding layer, an insulating layer, a wrapped semi-conductive insulating shielding layer, a metal shielding layer and an outer sheath, wherein the wrapped semi-conductive conductor shielding layer, the insulating layer, the wrapped semi-conductive insulating shielding layer, the metal shielding layer and the outer sheath are sequentially wrapped outside the conductor; the insulating layer is made of silicon rubber; the metal shielding layer is formed by weaving tinned copper wires and aramid fibers in a mixed mode.
2. The medium voltage flexible cable according to claim 1, wherein the wrapped semiconductive conductor shield and/or the wrapped semiconductive insulation shield is a wrapped semiconductive extra tape.
3. The medium voltage flexible cable according to claim 1, wherein the wrapped semiconductive conductor shield and/or the wrapped semiconductive insulation shield is wrapped semiconductive tape.
4. The medium voltage flexible cable according to claim 1, wherein the material of the outer sheath is a low smoke zero halogen polyolefin.
5. The medium voltage flexible cable according to any one of claims 1 to 4, wherein the conductor is a fifth type of tinned conductor.
6. The medium voltage flexible cable according to any one of claims 1 to 4, wherein the number of the conductors is one or more.
7. The medium voltage flexible cable according to any one of claims 1 to 4, wherein a layer of ceramic silicone rubber is further provided between the metallic shielding layer and the outer sheath.
8. The medium voltage flexible cable according to claim 7, wherein an alkali-free fiberglass tape layer is further provided between the silicone rubber ceramic layer and the outer sheath.
9. The medium voltage flexible cable according to any one of claims 1 to 4, further comprising between the metallic shielding layer and the outer sheath: the outer insulating layer is formed by extruding ethylene propylene rubber.
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| CN202120792740.9U CN213211745U (en) | 2021-04-19 | 2021-04-19 | Medium-voltage flexible cable |
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| CN202120792740.9U CN213211745U (en) | 2021-04-19 | 2021-04-19 | Medium-voltage flexible cable |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113316276A (en) * | 2021-05-28 | 2021-08-27 | 安徽天康(集团)股份有限公司 | Flexible silicon rubber constant power electric heating tape |
| CN114822936A (en) * | 2022-04-27 | 2022-07-29 | 浙江三科线缆股份有限公司 | Drag chain cable and forming process thereof |
| WO2023035487A1 (en) * | 2021-09-09 | 2023-03-16 | 江苏亨通电力电缆有限公司 | Medium-voltage feeder cable, preparation method therefor and application thereof |
-
2021
- 2021-04-19 CN CN202120792740.9U patent/CN213211745U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113316276A (en) * | 2021-05-28 | 2021-08-27 | 安徽天康(集团)股份有限公司 | Flexible silicon rubber constant power electric heating tape |
| WO2023035487A1 (en) * | 2021-09-09 | 2023-03-16 | 江苏亨通电力电缆有限公司 | Medium-voltage feeder cable, preparation method therefor and application thereof |
| CN114822936A (en) * | 2022-04-27 | 2022-07-29 | 浙江三科线缆股份有限公司 | Drag chain cable and forming process thereof |
| CN114822936B (en) * | 2022-04-27 | 2024-03-05 | 浙江三科线缆股份有限公司 | Drag chain cable and forming process thereof |
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