CN111210942A - Flexible direct current cable with cooling function - Google Patents
Flexible direct current cable with cooling function Download PDFInfo
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- CN111210942A CN111210942A CN201910828400.4A CN201910828400A CN111210942A CN 111210942 A CN111210942 A CN 111210942A CN 201910828400 A CN201910828400 A CN 201910828400A CN 111210942 A CN111210942 A CN 111210942A
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- Prior art keywords
- cable
- layer
- conductor
- cooling
- direct current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2806—Protection against damage caused by corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/32—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks
- H01B7/324—Insulated conductors or cables characterised by their form with arrangements for indicating defects, e.g. breaks or leaks comprising temperature sensing means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/421—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation
- H01B7/423—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction for heat dissipation using a cooling fluid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/005—Power cables including optical transmission elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Communication Cables (AREA)
Abstract
The invention relates to a flexible direct current cable with a cooling function, which solves the defects of the prior art, and adopts the technical scheme that: the cable comprises a cable core, a cooling pipeline and a temperature measurement optical fiber unit, wherein the cable core comprises a conductor, a conductor shielding layer is coated outside the conductor, an insulating layer is coated outside the conductor shielding layer, an insulating shielding layer is coated outside the insulating layer, a semi-conductive buffer layer is coated outside the insulating shielding layer, a metal shielding layer is coated outside the semi-conductive buffer layer, the cable core, the cooling pipeline and the temperature measurement optical fiber unit are all coated in a belting layer, a cable filling rope is filled in a gap inside the belting layer, and an outer sheath is coated outside the belting layer; the temperature measuring optical fiber unit is connected with a temperature monitoring system; the cooling pipeline is connected with a tap water pipeline, a switch of tap water is controlled by an electromagnetic valve, and a control signal of the electromagnetic valve is provided by a temperature monitoring system.
Description
Technical Field
The invention relates to a flexible direct current cable, in particular to a +/-10 kV flexible direct current cable with a cooling function.
Background
For a long time, alternating current power transmission is a main power transmission mode because alternating current power generation is relatively simple and does not need rectification, and alternating current power transmission is convenient for voltage transformation and is convenient for adopting high-voltage power transmission to reduce loss. However, with the development of power systems, the increase of transmission capacity and distance, the problems of stability in ac transmission, short-circuit capacity under a cut-off fault, and the like are increasingly complicated, and today, new technologies such as high-power thyristors, automatic control of dc transmission, and the like are developed, the dc transmission technology becomes possible and develops rapidly, and is widely applied worldwide. Compared with alternating current transmission, the direct current transmission has the following advantages: (1) there is no stability problem. (2) The direct current transmission not only has no stability problem, but also can improve the stability of alternating current systems at two ends of the direct current transmission. (3) The direct current circuit has low manufacturing cost which is about 65 percent of that of the direct current circuit with the same level voltage, and the consumption of nonferrous metals is small. (4) The conveying capacity is large. The power that can be transmitted by direct current transmission is about 1.5 times of the power transmitted by alternating current transmission with the same voltage. (5) The line loss is small. The direct current transmission has no reactive current, and the current and power loss of the line are smaller than those of the alternating current transmission. (6) The direct current transmission has a strong adaptability to the increase of power and transmission voltage. (7) And the power transmission reliability is high. (8) The control of the power flow under the direct current transmission is easier than that under the alternating current transmission. (9) The interference of direct current transmission to communication is small, the operation of grid connection and disconnection is simpler than that of alternating current, and the system with different frequencies can be connected. The +/-10 kV flexible direct-current cable is used on a direct-current transmission line.
In the operation process of the existing common +/-10 kV flexible direct current cable, when the line is overloaded and operates, the heating of a conductor is increased rapidly and greatly exceeds the long-term allowable operation temperature (90 ℃) of the conductor, so that the thermal aging speed of the cable insulation is accelerated, the service life of the cable and the long-term stable operation of the line are greatly reduced, and immeasurable loss and influence are brought to national economy and resident life.
Disclosure of Invention
The invention aims to solve the problems that in the operation process of the existing common +/-10 kV flexible direct current cable in the prior scheme, when the line is overloaded, the heating of a conductor is increased rapidly and greatly exceeds the long-term allowable operation temperature (90 ℃) of the conductor, the thermal aging speed of cable insulation is accelerated, the service life of the cable and the long-term stable operation of the line are greatly reduced, and inestimable loss and influence are brought to national economy and resident life, and the +/-10 kV flexible direct current cable with the cooling function is provided.
In order to achieve the purpose, the invention adopts the following technical scheme: a flexible direct current cable with a cooling function comprises a cable core, a cooling pipeline and a temperature measuring optical fiber unit, wherein the cable core comprises a conductor, a conductor shielding layer is arranged outside the conductor, an insulating layer is arranged outside the conductor shielding layer in a wrapping mode, an insulating shielding layer is arranged outside the insulating layer in a wrapping mode, a semi-conductive buffer layer is arranged outside the insulating shielding layer in a wrapping mode, a metal shielding layer is arranged outside the semi-conductive buffer layer in a wrapping mode, the cable core, the cooling pipeline and the temperature measuring optical fiber unit are all arranged in the wrapping layer in a wrapping mode, cable filling ropes are filled in gaps in the inner side of the wrapping layer, and an outer sheath is arranged outside the wrapping layer in a wrapping mode; the temperature measuring optical fiber unit is connected with a temperature monitoring system; the cooling pipeline is connected with a tap water pipeline, a switch of tap water is controlled by an electromagnetic valve, and a control signal of the electromagnetic valve is provided by a temperature monitoring system.
The structure of a common +/-10 kV flexible direct-current cable is as follows: the cable is completely cooled by means of air flow or contact with soil. The +/-10 kV flexible direct current cable structure with the cooling function is as follows: conductor + conductor shielding + insulation shielding + metal shielding + filling (temperature measuring optical fiber unit + cooling pipeline) + wrapping tape + outer sheath. And the temperature measuring optical fiber unit and the cooling pipeline are implanted when the insulated wire cores are stranded in a cable form, and the cooling pipeline is spirally wound on the surfaces of the insulated wire cores. After the whole direct current cable line is laid, connecting a temperature measuring optical fiber unit in the cable with a temperature monitoring system; the cooling pipeline is connected with a tap water pipeline, a switch of tap water is controlled by an electromagnetic valve, and a control signal of the electromagnetic valve is provided by a temperature monitoring system. In the cable operation process, temperature measurement optical fiber unit measures cable operating temperature in real time, transmit cable insulation core surface temperature to temperature monitoring system, the system passes through program calculation and then converts cable conductor's temperature into to the signal that receives, when conductor temperature exceedes 90 ℃, temperature monitoring system sends out signal at once and opens the valve for the solenoid valve, the water supply rushes into the cooling tube way, the most heat in insulation core surface is given away for the running water in the cooling tube way through the mode of heat transfer, the quick reduction of insulation core surface's temperature, the heat that the conductor overtemperature produced can be quick gives off through the insulating layer like this. When the temperature control system monitors that the temperature of the conductor is lower than 90 ℃, the electromagnetic valve automatically closes the valve, and the automatic cooling process of the cable is finished. Therefore, the invention has the advantages of realizing automatic cable cooling, ensuring that the cable insulation layer can not be aged more quickly due to conductor overload and overtemperature, causing quality accidents of cable thermal breakdown and enabling a direct current line system to run more stably for a long time.
Preferably, each cable core corresponds to one cooling pipeline, and each cooling pipeline is spirally wound on the surface of the cable core.
Preferably, the inner diameter of the cooling conduit is greater than 1/3 of the inner diameter of the conductor.
Preferably, the temperature measuring optical fiber unit is attached to one cable core.
Preferably, the outer sheath is a polyethylene sheath, and the outer side of the outer sheath is wrapped with a fiber hemp rope coated with asphalt. The form is that the corrosion resistance of the cable is improved, the high-density polyethylene outer sheath material has a compact molecular structure and very strong corrosion resistance, meanwhile, the fiber hemp rope coated with the asphalt is also a corrosion-resistant material, and the cable insulation wire core can still normally run in the environment of soaking seawater for a long time under the protection of the two-layer structure, so that the guarantee is provided for the long-term stable running of a direct current cable line.
Preferably, the outer sheath is a self-temperature-sensing color master batch polyethylene sheath. The self-temperature-sensing color master batch polyethylene sheath can be used as an assistant, and when ultrahigh temperature still exists under the condition of automatic cooling or self-cooling is in a problem, the temperature can be prevented from being further increased through the self-temperature-sensing color master batch polyethylene sheath.
The invention has the following beneficial effects: the cable cooling device has the advantages that the cable is automatically cooled, the insulating layer of the cable is prevented from being aged at an accelerated speed due to conductor overload and overtemperature, the quality accident of cable thermal breakdown is avoided, and a direct-current line system can run stably for a long time.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
In the figure: 1. the cable comprises a conductor, 2, a conductor shielding layer, 3, an insulating layer, 4, an insulating shielding layer, 5, a semi-conductive buffer layer, 6, a metal shielding layer, 7, a cable filling rope, 8, a belting layer, 9, an outer sheath, 10, a temperature measurement optical fiber unit, 11 and a cooling pipeline.
Detailed Description
The technical solution of the present invention is further specifically described below by way of specific examples in conjunction with the accompanying drawings.
Example 1:
a flexible direct current cable with a cooling function (see attached figure 1) comprises a cable core, a cooling pipeline 11 and a temperature measurement optical fiber unit 10, wherein the cable core comprises a conductor 1, a conductor shielding layer 2 is arranged outside the conductor, an insulating layer 3 is arranged outside the conductor shielding layer in a wrapping mode, an insulating shielding layer 4 is arranged outside the insulating layer in a wrapping mode, a semi-conductive buffer layer 5 is arranged outside the insulating shielding layer in a wrapping mode, a metal shielding layer 6 is arranged outside the semi-conductive buffer layer in a wrapping mode, the cable core, the cooling pipeline and the temperature measurement optical fiber unit are all arranged in a wrapping layer 8 in a wrapping mode, a cable filling rope 7 is filled in a gap on the inner side of the wrapping layer, and an outer sheath 9 is arranged outside the wrapping layer; the temperature measuring optical fiber unit is connected with a temperature monitoring system; the cooling pipeline is connected with a tap water pipeline, a switch of tap water is controlled by an electromagnetic valve, and a control signal of the electromagnetic valve is provided by a temperature monitoring system. Each cable core corresponds to a cooling pipeline, and each cooling pipeline is spirally wound on the surface of the cable core. The inner diameter of the cooling conduit is greater than 1/3 of the inner diameter of the conductor. The temperature measuring optical fiber unit is attached to one cable core.
In the embodiment, the temperature measuring optical fiber unit and the cooling pipeline are implanted when the insulating wire cores are stranded in a cable mode, and the cooling pipeline is spirally wound on the surfaces of the insulating wire cores. After the whole direct current cable line is laid, connecting a temperature measuring optical fiber unit in the cable with a temperature monitoring system; the cooling pipeline is connected with a tap water pipeline, a switch of tap water is controlled by an electromagnetic valve, and a control signal of the electromagnetic valve is provided by a temperature monitoring system. In the cable operation process, temperature measurement optical fiber unit measures cable operating temperature in real time, transmit cable insulation core surface temperature to temperature monitoring system, the system passes through program calculation and then converts cable conductor's temperature into to the signal that receives, when conductor temperature exceedes 90 ℃, temperature monitoring system sends out signal at once and opens the valve for the solenoid valve, the water supply rushes into the cooling tube way, the most heat in insulation core surface is given away for the running water in the cooling tube way through the mode of heat transfer, the quick reduction of insulation core surface's temperature, the heat that the conductor overtemperature produced can be quick gives off through the insulating layer like this. When the temperature control system monitors that the temperature of the conductor is lower than 90 ℃, the electromagnetic valve automatically closes the valve, and the automatic cooling process of the cable is finished. The embodiment has the advantages of realizing automatic cable cooling, ensuring that the cable insulation layer cannot be accelerated to age due to conductor overload and overtemperature, causing the quality accident of cable thermal breakdown, and enabling a direct current line system to run more stably for a long time.
Example 2:
this example is substantially the same as example 1, except that in this example, the outer sheath is a polyethylene sheath, and the outer side of the outer sheath is wrapped with a fiber hemp rope coated with asphalt. The embodiment increases the corrosion resistance of the cable, the high-density polyethylene outer sheath material has a compact molecular structure and very strong corrosion resistance, the fiber hemp rope coated with asphalt is also a corrosion-resistant material, the cable insulation wire core can still normally run in the seawater immersion environment for a long time under the protection of the two-layer structure, and the guarantee is provided for the long-term stable running of the direct-current cable line.
Example 3:
the present embodiment is substantially the same as embodiment 1, except that in the present embodiment, the outer sheath is a self-temperature-sensitive color masterbatch polyethylene sheath. The self-temperature-sensing color master batch polyethylene sheath can be used as an assistant, and when ultrahigh temperature still exists under the condition of automatic cooling or self-cooling is in a problem, the temperature can be prevented from being further increased through the self-temperature-sensing color master batch polyethylene sheath.
It should be understood that this example is for illustrative purposes only and is not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (6)
1. A flexible direct current cable with a cooling function is characterized by comprising a cable core, a cooling pipeline and a temperature measurement optical fiber unit, wherein the cable core comprises a conductor, a conductor shielding layer is arranged outside the conductor, an insulating layer is arranged outside the conductor shielding layer in a wrapping mode, an insulating shielding layer is arranged outside the insulating layer in a wrapping mode, a semi-conductive buffer layer is arranged outside the insulating shielding layer in a wrapping mode, a metal shielding layer is arranged outside the semi-conductive buffer layer in a wrapping mode, the cable core, the cooling pipeline and the temperature measurement optical fiber unit are all arranged in the wrapping layer in a wrapping mode, cable filling ropes are filled in gaps in the inner side of the wrapping layer, and an outer sheath is arranged outside the wrapping layer in a wrapping mode; the temperature measuring optical fiber unit is connected with a temperature monitoring system; the cooling pipeline is connected with a tap water pipeline, a switch of tap water is controlled by an electromagnetic valve, and a control signal of the electromagnetic valve is provided by a temperature monitoring system.
2. The flexible direct current cable with the cooling function as claimed in claim 1, wherein each cable core corresponds to one cooling pipe, and each cooling pipe is spirally wound on the surface of the cable core.
3. The flexible dc cable with self-cooling function as claimed in claim 2, wherein the inner diameter of said cooling channel is greater than 1/3 of the inner diameter of said conductor.
4. The flexible direct current cable with the cooling function as claimed in claim 1, 2 or 3, wherein the temperature measuring optical fiber unit is attached to one of the cable cores.
5. The flexible direct current cable with the cooling function as claimed in claim 1, 2 or 3, wherein the outer sheath is a polyethylene sheath, and the outer side of the outer sheath is wrapped with a fiber hemp rope coated with asphalt.
6. The flexible direct current cable with the cooling function according to claim 1, 2 or 3, wherein the outer sheath is a self-temperature-sensitive color master batch polyethylene sheath.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910828400.4A CN111210942A (en) | 2019-09-03 | 2019-09-03 | Flexible direct current cable with cooling function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910828400.4A CN111210942A (en) | 2019-09-03 | 2019-09-03 | Flexible direct current cable with cooling function |
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| Publication Number | Publication Date |
|---|---|
| CN111210942A true CN111210942A (en) | 2020-05-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910828400.4A Pending CN111210942A (en) | 2019-09-03 | 2019-09-03 | Flexible direct current cable with cooling function |
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| CN (1) | CN111210942A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113450961A (en) * | 2021-07-14 | 2021-09-28 | 浙江吉利控股集团有限公司 | Power cable and liquid cooling cable |
| CN113702741A (en) * | 2021-08-27 | 2021-11-26 | 中国电建集团河北省电力勘测设计研究院有限公司 | Novel cable structure and cable monitoring system |
| CN113921187A (en) * | 2021-09-09 | 2022-01-11 | 华中科技大学 | Direct current transmission cable pipeline tied in a bundle |
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| CN104575831A (en) * | 2015-01-28 | 2015-04-29 | 沈阳长城电缆实业有限公司 | Intelligent and environment-friendly type power cable with aluminum alloy cores |
| CN105469893A (en) * | 2014-09-05 | 2016-04-06 | 丹阳市明琪金属制品有限公司 | Multilayer copper-clad aluminum conductor |
| CN106128626A (en) * | 2016-08-29 | 2016-11-16 | 中天科技海缆有限公司 | ± 500kV SZ shape molded line conductor corrugated aluminium sheath Optical Fiber Composite direct current cables |
| CN107240454A (en) * | 2017-06-08 | 2017-10-10 | 北汽福田汽车股份有限公司 | Power cable, power cable assembly and electric automobile |
| CN107833690A (en) * | 2017-10-27 | 2018-03-23 | 天马远东电缆有限公司 | Multicore cable and its manufacture method are pressed in environment-friendly type fire resisting |
| CN209199655U (en) * | 2018-11-28 | 2019-08-02 | 人民电缆集团有限公司 | Optical fiber composite high-voltage power cable |
-
2019
- 2019-09-03 CN CN201910828400.4A patent/CN111210942A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105469893A (en) * | 2014-09-05 | 2016-04-06 | 丹阳市明琪金属制品有限公司 | Multilayer copper-clad aluminum conductor |
| CN104575831A (en) * | 2015-01-28 | 2015-04-29 | 沈阳长城电缆实业有限公司 | Intelligent and environment-friendly type power cable with aluminum alloy cores |
| CN106128626A (en) * | 2016-08-29 | 2016-11-16 | 中天科技海缆有限公司 | ± 500kV SZ shape molded line conductor corrugated aluminium sheath Optical Fiber Composite direct current cables |
| CN107240454A (en) * | 2017-06-08 | 2017-10-10 | 北汽福田汽车股份有限公司 | Power cable, power cable assembly and electric automobile |
| CN107833690A (en) * | 2017-10-27 | 2018-03-23 | 天马远东电缆有限公司 | Multicore cable and its manufacture method are pressed in environment-friendly type fire resisting |
| CN209199655U (en) * | 2018-11-28 | 2019-08-02 | 人民电缆集团有限公司 | Optical fiber composite high-voltage power cable |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113450961A (en) * | 2021-07-14 | 2021-09-28 | 浙江吉利控股集团有限公司 | Power cable and liquid cooling cable |
| CN113702741A (en) * | 2021-08-27 | 2021-11-26 | 中国电建集团河北省电力勘测设计研究院有限公司 | Novel cable structure and cable monitoring system |
| CN113921187A (en) * | 2021-09-09 | 2022-01-11 | 华中科技大学 | Direct current transmission cable pipeline tied in a bundle |
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Application publication date: 20200529 |