CN113270224B - High-voltage-resistant superconducting cable potential detection wire insulation leading-out structure - Google Patents
High-voltage-resistant superconducting cable potential detection wire insulation leading-out structure Download PDFInfo
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- CN113270224B CN113270224B CN202110553861.2A CN202110553861A CN113270224B CN 113270224 B CN113270224 B CN 113270224B CN 202110553861 A CN202110553861 A CN 202110553861A CN 113270224 B CN113270224 B CN 113270224B
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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
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/10—Insulating conductors or cables by longitudinal lapping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
The invention discloses a high-voltage-resistant superconducting cable potential detection line insulation leading-out structure, which realizes the stable leading-out of a potential detection line of a superconducting cable from an insulating layer and comprises the superconducting cable, wherein the superconducting cable is connected with wire cores of a plurality of detection lines through a plurality of welding points, and a section of isolation pipe is sleeved on the detection line; the lead path of the detection line comprises steps spliced by sheared prepreg thin strips, insulating layer steps wrapped by a composite insulating layer and steps formed by insulating fillers and wet wrapping insulators; the detection wire leads out the superconducting cable through the lead path; a gap between the probe wire and the superconducting cable is filled with prepreg; the composite insulating layer contains a prepreg; insulation filler is fixed below the leading-out port of the detection wire, and wet wrapping insulation covers the upper side of the detection wire; the isolation tube is used for isolating the self insulation of the leading-out part of the detection wire from the composite insulation layer and the wet wrapping insulation contact; the composite insulating layer is cured by pressurization and heating, and the insulating filler and the wet wrapping insulation are naturally cured.
Description
Technical Field
The invention relates to the technical field of magnetic confinement fusion superconducting magnet feeders, in particular to an insulation lead-out structure of a superconducting cable high-voltage potential detection line and a manufacturing method thereof.
Background
In a large-scale superconducting magnetic confinement fusion device, a superconducting cable in a superconducting feeder line plays an important role in supplying power and cold to a superconducting magnet system. The potential detection line is arranged on the surface of the superconducting cable, measures the potential of the superconducting cable section by section, monitors the running state of the superconducting cable and is an important diagnosis signal source for the quench detection. The outermost layer of the superconducting cable is coated with a composite insulating layer capable of bearing high voltage, the potential detection wire is led out and must penetrate through the insulating layer, the integrity of the insulating layer is damaged, and once the insulation of the led-out part has defects, the potential detection wire is extremely easy to become a source of high-voltage arc discharge in complex working environments such as low temperature, vacuum, magnetic fields and the like. Serious operation accidents caused by improper leading-out of potential detection wires occur in superconducting magnetic confinement fusion devices such as EAST, W7-X and the like. Therefore, the reliability of the high-voltage potential detection line insulation leading-out structure can directly influence the safe operation of the superconducting cable and even the whole superconducting magnet system.
Disclosure of Invention
The invention provides a high-voltage-resistant superconducting cable potential detection wire insulation leading-out structure and a manufacturing method thereof, aiming at solving the problem of leading out a superconducting cable potential detection wire. The invention solves the problem of leading out the potential probe line on the surface of the superconducting cable, the lead-out structure of the potential probe line has good tightness and low porosity, can stably transmit electric signals under high vacuum and low temperature environments, and ensures the safe and stable operation of the superconducting cable.
The technical scheme adopted by the invention for realizing the aim is as follows: a high-voltage-resistant superconducting cable potential detection wire insulation leading-out structure comprises a superconducting cable, wherein the superconducting cable is connected with wire cores of a plurality of detection wires through a plurality of welding points, and a section of isolation pipe is sleeved on each detection wire;
the lead path of the detection line comprises a step spliced by sheared prepreg thin strips, an insulating layer step wrapped by a composite insulating layer and a step formed by insulating filler and wet wrapping insulation; the detection wire leads out the superconducting cable through the lead path;
a gap between the probe wire and the superconducting cable is filled with prepreg;
the composite insulating layer comprises a front-section composite insulating layer and a rear-section composite insulating layer and contains prepreg;
insulation filler is fixed below the leading-out port of the detection wire, and wet wrapping insulation covers the upper side of the detection wire; the isolation tube is used for isolating the self insulation of the leading-out position of the detection line from the insulation contact of the composite insulation layer and the wet wrapping insulation; the composite insulating layer is cured by pressurizing and heating, and the insulating filler and the wet wrapping insulation are naturally cured.
According to another aspect of the present invention, a method for manufacturing an insulation lead-out structure of a high voltage resistant superconducting cable potential probe wire as described above comprises the following steps:
step 1: wrapping the rear-section composite insulating layer on one side of the leading-out direction of the detection wire on the surface of the superconducting cable in a half-lap wrapping mode, and reserving a splicing step with a first preset length on the inner side of the prepreg;
step 2: sleeving an isolation tube on the surface of each detection line respectively, wherein the initial position of the isolation tube is arranged in the transition stage of leading the detection line out of the composite insulating layer, and the isolation tube is exposed out of the insulation layer by a second length so as to prevent the insulation layer on the surface of the detection line from being brittle when encountering the composite insulating layer and the wet wrapping insulation;
and step 3: wrapping a layer of prepreg on the surface of the detection line in a half-lap wrapping mode, and then flatly wrapping all the detection lines together in the same mode to fill gaps among the detection lines;
and 4, step 4: removing the insulation layer at the root of the detection line, polishing the connection surface of the core of the detection line and the superconducting cable, and welding;
and 5: cutting the prepreg into strips, and laying from the welding point of the detection line so as to enable the detection line to be in stable transition with the surface of the conductor;
step 6: wrapping the front end of the other side of the detection line by using a half-lap wrapping mode to form composite insulation;
and 7: wrapping a layer of sealing bag film on the surface of the wrapped composite insulating layer, wrapping a silica gel strip and a glass ribbon on the surface of the bag film to avoid insulating deformation in the curing process, and then putting the bag film into an oven for heating and curing;
and 8: adding insulating filler at the outlet of the outgoing line, and simultaneously fixing the outgoing line by wrapping the outgoing line with wet insulation;
and step 9: after the insulation filler and wet wrap insulation is completed, it is left for a period of time and allowed to cure naturally.
Has the advantages that:
the high-voltage-resistant superconducting cable potential detection line insulation leading-out structure effectively solves the problem of leading-out of the superconducting cable potential detection line, has good sealing performance and low porosity, can stably transmit electric signals in high vacuum and low temperature environments, ensures safe and stable operation of a superconducting cable, and ensures safe and stable operation of a superconducting feeder line system. Specifically, the following prominent technical effects are achieved:
1. the potential detection line is led out and integrally formed with the superconducting cable insulating layer, and the method is suitable for various insulating curing processes such as prepreg and wet wrapping;
2. the potential detection line and the superconducting cable insulating layer have no gap, a longer leading-out path is provided, and the potential detection line can bear over 30kV direct-current voltage in a low-pressure environment;
3. the sleeve protection is arranged outside the potential detection wire, so that the compatibility problem of the insulation of the detection wire and the insulation of the superconducting cable is solved.
Drawings
FIG. 1 is a schematic diagram of a lead-out structure of a probe line according to the present invention;
fig. 2 is a schematic view of the welding position of the superconducting cable and the probe wire according to the present invention.
Wherein: the superconducting cable comprises a superconducting cable 1, a front-section composite insulating layer 2, prepreg 3, a welding point 4, a detection line 5, wet wrapping insulation 6, an isolation pipe 7, insulation filler 8 and a rear-section composite insulating layer 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person skilled in the art based on the embodiments of the present invention belong to the protection scope of the present invention without creative efforts.
According to an embodiment of the invention, as shown in fig. 1 and 2. A high-voltage-resistant superconducting cable potential detection wire insulation leading-out structure comprises a superconducting cable 1, wherein the superconducting cable is connected with a wire core of a detection wire 5 through a welding point 4, and a section of isolation pipe 7 is sleeved on the detection wire 5; the sleeve protection is arranged outside the potential detection wire, so that the compatibility problem of the detection wire insulation and the superconducting cable composite insulation is solved, and the direct-current voltage of over 30kV can be endured in a low-pressure environment. A gap between the detection wire 5 and the superconducting cable 1 is filled with prepreg 3, a composite insulating layer containing the prepreg is wound on the lead path and comprises a front-section composite insulating layer 2 and a rear-section composite insulating layer 9, an insulating filler 8 is fixed below the leading-out port of the detection wire 5, and wet winding insulation 6 covers the upper side of the detection wire; the isolation tube 7 is used for isolating the lead-out position of the detection wire 5 from contacting with the wrapped front-section composite insulating layer 2, the wrapped rear-section composite insulating layer 9 and the wet wrapping insulating layer 6.
According to an embodiment of the present invention, the method for manufacturing the insulation lead-out structure of the high voltage resistant superconducting cable potential detection line includes the following steps:
step 1: the rear-section composite insulating layer on one side of the leading-out direction of the detection line is wrapped on the surface of the superconducting cable in a half-overlapping mode, and the prepreg is in contact with the superconducting cable on the inner side. The length of the reserved splicing step is about 200 mm;
step 2: the surface of each detection line is sleeved with an isolation tube respectively, the position of the isolation tube is arranged in the transition stage of leading out the detection line from the composite insulating layer, the length of the isolation tube exposed out of the wet wrapping insulation is about 100mm, and the total length is about 200mm so as to prevent the insulation layer on the surface of the detection line from cracking when encountering the composite insulating layer and the wet wrapping insulation; the composite insulation is prepreg-containing, and the isolation pipe is arranged on the upper half part of the composite insulation and penetrates through the insulation filler and the wet wrapping insulation;
and step 3: wrapping a layer of prepreg (the prepreg is an insulating material and can effectively reduce the defects of internal bubbles and the like after being heated, flowed and cured) on the surface of the detection line in a half-lap wrapping mode, and then flatly wrapping all the detection lines together in the same mode to fill gaps among the detection lines; according to the embodiment of the invention, the outgoing lines are firstly wrapped by one layer, then all the outgoing lines are tiled and arranged, and then the outgoing lines are integrally wrapped once, so that the relative positions of the four lines are fixed, and gaps can be filled;
and 4, step 4: removing the insulation layer at the root of the detection line, polishing the connection surface of the core of the detection line and the superconducting cable, and welding;
and 5: cutting the prepreg into a width of about 1mm, and paving the prepreg from a welding point of the detection line according to the actual required length of about 10-40mm (because the outgoing line is cylindrical, the transition between the outgoing line and the surface of the superconducting cable needs to be carried out again by using a long prepreg), so that the detection line and the surface of the conductor are in smooth transition;
step 6: wrapping the front end of the other side of the detection line by using a half-lap wrapping mode to form composite insulation;
and 7: wrapping a layer of sealing bag film on the surface of the wrapped composite insulating layer, wrapping a silica gel strip and a glass ribbon on the surface of the bag film to avoid insulating deformation in the curing process, and then putting the bag film into an oven for heating and curing;
and 8: adding insulating filler at the outlet of the outgoing line, and simultaneously fixing the outgoing line by wrapping the outgoing line with wet insulation;
and step 9: after the insulation filler and wet wrap insulation is completed, it is left for a period of time and allowed to cure naturally.
According to the manufacturing method, the potential detection wire is led out and integrally formed with the superconducting cable insulating layer, and the method is suitable for various insulation curing processes such as prepreg and wet wrapping; the potential detection line and the superconducting cable insulating layer have no gap, a longer leading-out path is provided, and the potential detection line can bear over 30kV direct-current voltage in a low-pressure environment; .
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but various changes may be apparent to those skilled in the art, and it is intended that all inventive concepts utilizing the inventive concepts set forth herein be protected without departing from the spirit and scope of the present invention as defined and limited by the appended claims.
Claims (3)
1. A high voltage resistant superconducting cable potential detection wire insulation leading-out structure is characterized in that: the superconducting cable is connected with the wire cores of a plurality of detection wires through a plurality of welding points, and a section of isolation pipe is sleeved on each detection wire;
the lead path of the detection line comprises steps spliced by sheared prepreg thin strips, insulating layer steps wrapped by a composite insulating layer and steps formed by insulating fillers and wet wrapping insulators; the detection wire leads out the superconducting cable through the lead path;
a gap between the probe wire and the superconducting cable is filled with prepreg;
the composite insulating layer comprises a front-section composite insulating layer and a rear-section composite insulating layer and contains prepreg;
insulation filler is fixed below the leading-out port of the detection wire, and wet wrapping insulation covers the upper side of the detection wire; the isolation tube is used for isolating the self insulation of the leading-out position of the detection line from the insulation contact of the composite insulation layer and the wet wrapping insulation; the composite insulating layer is cured by pressurizing and heating, and the insulating filler and the wet wrapping insulation are naturally cured.
2. The method for manufacturing the insulation lead-out structure of the high voltage resistant superconducting cable potential detection wire according to claim 1, which comprises the following steps:
step 1: wrapping the rear-section composite insulating layer on one side of the leading-out direction of the detection wire on the surface of the superconducting cable in a half-lap wrapping mode, and reserving a splicing step with a first preset length on the inner side of the prepreg;
step 2: sleeving an isolation tube on the surface of each detection wire respectively, wherein the initial position of the isolation tube is arranged in the transition stage of leading out the detection wire from the composite insulating layer, and the isolation tube is exposed out of insulation by a second length so as to prevent the insulation layer on the surface of the detection wire from being brittle when encountering the composite insulating layer and wet surrounding insulation;
and step 3: wrapping a layer of prepreg on the surface of the detection line in a half-lap wrapping mode, and then flatly wrapping all the detection lines together in the same mode to fill gaps among the detection lines;
and 4, step 4: removing the insulation layer at the root part of the detection line, polishing the connection surface of the core of the detection line and the superconducting cable, and welding;
and 5: cutting the prepreg into strips, and laying from the welding point of the detection line so as to enable the detection line to be stably transited with the surface of the conductor;
step 6: wrapping the front end of the other side of the detection line by using a half-lap wrapping mode to form composite insulation;
and 7: wrapping a layer of sealing bag film on the surface of the wrapped composite insulating layer, wrapping a silica gel strip and a glass ribbon on the surface of the bag film to avoid insulating deformation in the curing process, and then putting the bag film into an oven for heating and curing;
and 8: adding insulating filler at the outlet of the outgoing line, and simultaneously fixing the outgoing line by wet wrapping insulation;
and step 9: after the insulation filler and wet wrap insulation is completed, it is placed and allowed to cure naturally.
3. The method for manufacturing the insulation lead-out structure of the high voltage resistant superconducting cable potential detection wire according to claim 2, wherein the composite insulation layer is made of a material containing prepreg.
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