CN114242334A - An intermediate joint of a three-phase coaxial superconducting AC cable - Google Patents
An intermediate joint of a three-phase coaxial superconducting AC cable Download PDFInfo
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- CN114242334A CN114242334A CN202111539904.8A CN202111539904A CN114242334A CN 114242334 A CN114242334 A CN 114242334A CN 202111539904 A CN202111539904 A CN 202111539904A CN 114242334 A CN114242334 A CN 114242334A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 146
- 239000007788 liquid Substances 0.000 claims abstract description 73
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 73
- 238000009413 insulation Methods 0.000 claims abstract description 45
- 239000004020 conductor Substances 0.000 claims abstract description 43
- 238000010292 electrical insulation Methods 0.000 claims description 7
- 239000000565 sealant Substances 0.000 claims description 7
- 239000003365 glass fiber Substances 0.000 claims description 4
- 235000019362 perlite Nutrition 0.000 claims description 3
- 239000010451 perlite Substances 0.000 claims description 3
- 230000016507 interphase Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 239000010963 304 stainless steel Substances 0.000 description 3
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 239000002887 superconductor Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/04—Single wire
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/03—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations
- H01R11/09—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations the connecting locations being identical
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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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- Superconductors And Manufacturing Methods Therefor (AREA)
- Gas Or Oil Filled Cable Accessories (AREA)
Abstract
The invention discloses an intermediate joint of a three-phase coaxial superconducting alternating current cable, which comprises: a heat insulating box containing liquid nitrogen, wherein two ends of the heat insulating box are respectively connected with the first superconducting cable and the second superconducting cable; the shielding layer joint box, the C-joint box, the B-joint box and the C-joint box are accommodated in the heat insulation box and are coaxially arranged from outside to inside; the shielding layer joint boxes are respectively connected with shielding layers of the first superconducting cable and the second superconducting cable, the C-phase joint boxes are respectively connected with C-phase conductor layers of the first superconducting cable and the second superconducting cable, the B-phase joint boxes are respectively connected with B-phase conductor layers of the first superconducting cable and the second superconducting cable, and the A-phase joint boxes are respectively connected with A-phase conductor layers connecting the first superconducting cable and the second superconducting cable; and the liquid nitrogen return pipe joints are respectively connected with the liquid nitrogen return pipes of the first superconducting cable and the second superconducting cable. The invention can simultaneously realize the functions of electric connection, interphase insulation and low-temperature maintenance.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to an intermediate joint of a three-phase coaxial superconducting alternating current cable.
Background
The three-phase coaxial superconductive AC cable is a new type of power equipment, has the characteristic of zero resistance, and can reduce the resistance loss during the transmission of electric energy. The superconductor can present a superconducting characteristic only by being soaked in liquid nitrogen when working at 77k, and because the requirements of working environment are strict, the intermediate joint of the superconducting alternating current cable needs to simultaneously realize the functions of electrical connection, interphase insulation, low-temperature maintenance and the like, no complete solution is available at present.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an intermediate joint of a three-phase coaxial superconducting alternating current cable, so as to realize the functions of electrical connection, interphase insulation and low-temperature maintenance at the same time.
In order to solve the above technical problem, the present invention provides an intermediate joint for a three-phase coaxial superconducting ac cable, comprising:
a heat insulating box containing liquid nitrogen, wherein two ends of the heat insulating box are respectively connected with the first superconducting cable and the second superconducting cable;
the shielding layer joint box, the C-joint box, the B-joint box and the C-joint box are accommodated in the heat insulation box and are coaxially arranged from outside to inside; the shielding layer joint boxes are respectively connected with shielding layers of the first superconducting cable and the second superconducting cable, the C-phase joint boxes are respectively connected with C-phase conductor layers of the first superconducting cable and the second superconducting cable, the B-phase joint boxes are respectively connected with B-phase conductor layers of the first superconducting cable and the second superconducting cable, and the A-phase joint boxes are respectively connected with A-phase conductor layers connecting the first superconducting cable and the second superconducting cable; and the liquid nitrogen return pipe joints are respectively connected with the liquid nitrogen return pipes of the first superconducting cable and the second superconducting cable.
Further, the heat-insulating box includes a heat-insulating outer case having a rectangular opening side for fitting with the heat-insulating cover plate, and a heat-insulating cover plate; the heat insulation shell is provided with a heat insulation groove below the rectangular opening side and used for accommodating the shielding layer joint box, the C-joint box, the B-joint box, the C-joint box and the liquid nitrogen backflow pipe joint, and liquid nitrogen is contained in the heat insulation groove.
Furthermore, the two ends of the heat insulation shell are symmetrically provided with connecting pipes which are respectively connected with the first superconducting cable through a first cable connecting flange and connected with the second superconducting cable through a second cable connecting flange.
Further, the interior of the heat-insulating cover plate is of a hollow structure, the interior of the heat-insulating cover plate is vacuumized, and heat-insulating perlite is filled in the heat-insulating cover plate.
Furthermore, the heat insulation shell and the heat insulation cover plate are connected by adopting low-temperature sealant, and are externally wound with glass fiber ropes for reinforcement.
Further, shielding layer joint box, C meet first box, B meet first box, C meet first box be the pipe structure that is formed by two hollow semicylinder structure locks.
Furthermore, the shielding layer joint box comprises a first round pipe part and first conductive connecting parts arranged at two ends of the first round pipe part, the first conductive connecting parts are respectively contacted with shielding conductor layers of the first superconducting cable and the second superconducting cable, and the first round pipe part is filled with liquid nitrogen to realize the electrical insulation of the shielding layer joint box and C-phase conductor layers of the first superconducting cable and the second superconducting cable;
the C-phase connector box comprises a second round pipe part and second conductive connecting parts arranged at two ends of the second round pipe part, the second conductive connecting parts are respectively contacted with C-phase conductor layers of the first superconducting cable and the second superconducting cable, and the second round pipe part is filled with liquid nitrogen to realize the electrical insulation between the C-phase connector box and B-phase conductors of the first superconducting cable and the second superconducting cable;
the B-phase connector box comprises a third round pipe part and third conductive connecting parts arranged at two ends of the third round pipe part, the third conductive connecting parts are respectively contacted with B-phase conductor layers of the first superconducting cable and the second superconducting cable, and the third round pipe part is filled with liquid nitrogen to realize the electric insulation between the B-phase connector box and A-phase conductors of the first superconducting cable and the second superconducting cable;
the A-phase connector box comprises a fourth round pipe part and fourth conductive connecting parts arranged at two ends of the fourth round pipe part, the fourth conductive connecting parts are respectively contacted with the A-phase conductor layers of the first superconducting cable and the second superconducting cable, and the fourth round pipe part is filled with liquid nitrogen to realize the electric insulation between the A-phase connector box and the liquid nitrogen return pipes of the first superconducting cable and the second superconducting cable.
Further, liquid nitrogen is filled between the shielding layer joint box and the heat insulation shell, and electric insulation between the shielding layer joint box and the heat insulation shell is achieved.
Further, a hexagonal assembling portion is arranged on the outer surface of the liquid nitrogen return pipe joint and used for being matched with an open spanner to tighten and loosen the liquid nitrogen return pipe joint; the left end and the right end in the liquid nitrogen backflow pipe joint are respectively provided with left-handed threads and right-handed threads, the liquid nitrogen backflow pipe joint is connected with a male head of the left-handed threads through the left-handed threads and is connected with a male head of the right-handed threads, the male head of the right-handed threads is welded with a liquid nitrogen backflow pipe of a first superconducting cable, and the male head of the left-handed threads is welded with a liquid nitrogen backflow pipe of a second superconducting cable, so that the liquid nitrogen backflow pipes of the first superconducting cable and the second superconducting cable are connected with each other.
Furthermore, the radial clearance between the shielding layer joint box, the C joint box, the B joint box and the C joint box is 10mm, and the axial clearance is 100 mm.
The implementation of the invention has the following beneficial effects: the insulation box containing liquid nitrogen is provided, the shielding layer joint box, the C joint box, the B joint box and the C joint box are coaxially arranged in the insulation box from outside to inside, each joint box is respectively connected with the shielding layer and the conductor layer of the superconducting cable, so that the electric connection of the two superconducting cables is realized, meanwhile, the joint boxes are all circular tube structures formed by buckling two hollow semi-cylindrical structures, and are filled with the liquid nitrogen, so that the electric insulation between corresponding elements is realized; liquid nitrogen is also contained in the heat insulation box, so that the intermediate joint can be kept at the temperature below 77 k; the intermediate joint of the embodiment can be widely applied to the requirement of the superconducting cable for laying in the environments of cable trenches, cable tunnels, cable bridges and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic perspective exploded view of an intermediate joint of a three-phase coaxial superconducting ac cable according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a partially exploded structure of an intermediate joint of a three-phase coaxial superconducting ac cable according to an embodiment of the present invention.
Fig. 3 is a schematic view of an assembly structure of an intermediate joint of a three-phase coaxial superconducting ac cable according to an embodiment of the present invention.
Fig. 4 is another assembly structure diagram of the intermediate joint of the three-phase coaxial superconducting ac cable according to the embodiment of the present invention.
Fig. 5 is a schematic perspective view of a shield layer connector box according to an embodiment of the present invention.
Fig. 6 is a schematic perspective view of a liquid nitrogen return pipe joint according to an embodiment of the present invention.
Fig. 7 is a schematic perspective view of a superconducting cable according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.
Referring to fig. 1 to 4, an embodiment of the invention provides an intermediate joint of a three-phase coaxial superconducting ac cable, including:
a thermal insulation box 1 containing liquid nitrogen, wherein both ends of the thermal insulation box 1 are respectively connected with a first superconducting cable 7 and a second superconducting cable 8;
a shielding layer joint box 2, a C-joint box 3, a B-joint box 4 and a C-joint box 5 which are accommodated in the heat insulation box 1 and are coaxially arranged from outside to inside; the shield layer joint box 2 is connected with the shield layers of the first superconducting cable 7 and the second superconducting cable 8 respectively, the C-phase joint box 3 is connected with the C-phase conductor layers of the first superconducting cable 7 and the second superconducting cable 8 respectively, the B-phase joint box 4 is connected with the B-phase conductor layers of the first superconducting cable 7 and the second superconducting cable 8 respectively, and the A-phase joint box 5 is connected with the A-phase conductor layers connecting the first superconducting cable 7 and the second superconducting cable 8 respectively; the liquid nitrogen return pipe joint 6 is respectively connected with the liquid nitrogen return pipes of the first superconducting cable 7 and the second superconducting cable 8.
Specifically, as shown in fig. 5-7, the heat-insulating box 1 includes a heat-insulating casing 11 and a heat-insulating cover plate 12, wherein the heat-insulating casing 11 is made of 304 stainless steel plate and is made by rolling, folding and welding processes. The insulating shell 11 has a rectangular open side for fitting with the insulating cover plate 2. The heat insulating case 11 has a heat insulating groove 110 formed below the rectangular opening side for accommodating the shield layer joint box 2, the C-phase joint box 3, the B-phase joint box 4, the C-phase joint box 5, and the liquid nitrogen return pipe joint 6, and liquid nitrogen is also contained in the heat insulating groove 110 to keep the intermediate joint of the present embodiment at a temperature of 77k or less. As an example, the adiabatic slots 110 have a length of 2500mm, a width of 350mm and a depth of 350 mm. The heat insulating case 11 is symmetrically provided at both ends with connection pipes 111 connected to the first superconducting cable 7 through the first cable connection flange 70 and connected to the second superconducting cable 8 through the second cable connection flange 80, respectively. The heat insulation cover plate 12 is made of a 304 stainless steel plate by adopting a folded plate and welding process, is matched with the heat insulation shell 11 and is used for preventing liquid nitrogen in the heat insulation groove 110 from overflowing the heat insulation shell 11. The inside of the heat insulation cover plate 2 is of a hollow structure, the wall thickness of the inner layer and the outer layer is 5mm, the distance is 15mm, the inside is vacuumized, and heat insulation perlite is filled. The heat-insulating shell 11 and the heat-insulating cover plate 12 are connected by low-temperature sealant, and are reinforced by winding glass fiber ropes outside the heat-insulating shell.
The shielding layer joint box 2, the C joint box 3, the B joint box 4 and the C joint box 5 are two hollow semi-cylindrical structures which are mutually buckled to form a complete circular tube structure. Fig. 5 shows one of the hollow semicylindrical structures of the shield layer joint box in this embodiment. The shielding layer joint box 2 is made of oxygen-free copper, the surface of the shielding layer joint box is plated with a second-generation superconducting material in a vapor deposition mode, and the whole through-current capacity of the shielding layer joint box is consistent with that of a superconducting cable. The shield layer joint box 2 includes a round tube part 20 and conductive connection parts 21 provided at both ends of the round tube part 20, the conductive connection parts 21 are respectively in contact with the shield conductor layers of the first superconducting cable 7 and the second superconducting cable 8, the round tube part is filled with liquid nitrogen, and the shield layer joint box 2 is electrically insulated from the C-phase conductor layers of the first superconducting cable 7 and the second superconducting cable 8. The two hollow semi-cylindrical structures are buckled by adopting a screw rod. After the buckling, liquid nitrogen is filled between the shielding layer joint box 2 and the heat insulation shell 11, the distance is larger than 10mm, and the electric insulation between the shielding layer joint box 2 and the heat insulation shell 11 is realized. As an example, the inner diameter of the circular tube part 20 is 195mm, and the outer diameter is 200 mm; the conductive connection part 21 has an inner diameter of 120mm and an outer diameter of 200 mm.
It should be noted that, in this embodiment, the shield layer joint cartridge 2, the C-joint cartridge 3, the B-joint cartridge 4, and the C-joint cartridge 5 have similar structures, and each of the shield layer joint cartridge includes a circular tube portion and conductive connection portions disposed at both ends of the circular tube portion, and the differences are that the inner and outer diameters, the lengths, and the connected components are different, specifically:
(1) the conductive connection part of the C-phase joint box 3 is respectively contacted with the C-phase conductor layers of the first superconducting cable 7 and the second superconducting cable 8, and the round pipe part of the C-phase joint box is filled with liquid nitrogen, so that the electrical insulation between the C-phase joint box 3 and the B-phase conductors of the first superconducting cable 7 and the second superconducting cable 8 is realized; the inner diameter of the round pipe part is 170mm, and the outer diameter is 175 mm; the inner diameter of the conductive connecting part is 110mm, and the outer diameter of the conductive connecting part is 175 mm;
(2) the conductive connection part of the B-phase joint box 4 is respectively contacted with the B-phase conductor layers of the first superconducting cable 7 and the second superconducting cable 8, and the round pipe part of the B-phase joint box is filled with liquid nitrogen to realize the electric insulation between the B-phase joint box 4 and the A-phase conductors of the first superconducting cable 7 and the second superconducting cable 8; the inner diameter of the round pipe part is 145mm, and the outer diameter of the round pipe part is 150 mm; the inner diameter of the conductive connecting part is 100mm, and the outer diameter of the conductive connecting part is 150 mm;
(3) the conductive connection part of the a-phase joint box 5 is respectively in contact with the a-phase conductor layers of the first superconducting cable 7 and the second superconducting cable 8, and the round pipe part of the a-phase joint box is filled with liquid nitrogen, so that the electrical insulation between the a-phase joint box 5 and the liquid nitrogen return pipes of the first superconducting cable 7 and the second superconducting cable 8 is realized; the inner diameter of the round pipe part is 120mm, and the outer diameter of the round pipe part is 125 mm; the conductive connection part has an inner diameter of 90mm and an outer diameter of 125 mm.
The radial gap between every two joint boxes is 10mm, the axial gap is 100mm, and the inside of every joint box is filled with liquid nitrogen for keeping the superconducting state of each layer and realizing electrical insulation.
The liquid nitrogen return pipe joint 6 is integrally turned from 304 stainless steel, and a hexagonal assembling portion 60 is formed on the outer surface of the liquid nitrogen return pipe joint and used for being matched with an open spanner to screw and loosen the liquid nitrogen return pipe joint 6. The left and right ends in the liquid nitrogen return pipe joint 6 are respectively provided with left-handed screw threads 61 and right-handed screw threads 62 which are metric triangular screw threads of M25 x 2; the liquid nitrogen return pipe joint 6 is connected with a left-hand thread male through a left-hand thread 61 and a right-hand thread male through a right-hand thread 62, the right-hand thread male is welded with the liquid nitrogen return pipe of the first superconducting cable 7, and the left-hand thread male is welded with the liquid nitrogen return pipe of the second superconducting cable 8, so that the liquid nitrogen return pipes of the first superconducting cable and the second superconducting cable are connected with each other.
In this embodiment, the first superconducting cable 7 and the second superconducting cable 8 have the same structure, the rated current is 2000A, and the rated voltage is direct current 10kV, and the structure thereof will be described below by taking the first superconducting cable 7 as an example with reference to fig. 7. The first superconducting cable 7 comprises a heat-insulating Dewar pipe 71, a shielding insulating layer 72, a shielding conductor layer 73, a C-phase insulating layer 74, a C-phase conductor layer 75, a B-phase insulating layer 76, a B-phase conductor layer 77, an A-phase insulating layer 78, an A-phase conductor layer 79, a liquid nitrogen return pipe insulating layer 70 and a liquid nitrogen return pipe 701 which are coaxially arranged from outside to inside, wherein a gap of 5mm is formed between the heat-insulating Dewar pipe 71 and the shielding insulating layer 72 and liquid nitrogen can flow through; the shielding conductor layer 73, the C-phase conductor layer 75, the B-phase conductor layer 77, and the a-phase conductor layer 79 are each made by winding a second-generation superconductor tape.
The assembling process of the intermediate joint of the three-phase coaxial superconducting ac cable and the superconducting cable according to the present embodiment is described as follows:
firstly, a first cable connecting flange 70 is sleeved on the outer sheath of the first superconducting cable 7, and a second cable connecting flange 80 is sleeved on the outer sheath of the second superconducting cable 8;
placing the heat insulating casing 11 of the heat insulating box 1, and connecting the first superconducting cable 7 and the second superconducting cable 8 to the heat insulating casing 11 through the first cable connecting flange 70 and the second cable connecting flange 80, respectively;
adjusting the positions of the first superconducting cable 7 and the second superconducting cable 8, screwing a liquid nitrogen return pipe joint, and connecting liquid nitrogen return pipes of the first superconducting cable and the second superconducting cable;
installing joint boxes in the heat insulation shell 11 according to the sequence of the A-phase joint box 5, the B-phase joint box 4, the C-phase joint box 3 and the shielding layer joint box 2;
smearing low-temperature sealant on the outer sheaths of the first superconducting cable 7 and the second superconducting cable 8, and bonding the first cable connecting flange 70 and the outer sheath of the first superconducting cable 7, and bonding the second cable connecting flange 80 and the outer sheath of the second superconducting cable 8;
before the low-temperature sealant is solidified, adjusting the positions of the first cable connecting flange 70 and the second cable connecting flange 80, and connecting the heat insulation shell 11 with the first cable connecting flange 70 and the second superconducting cable connecting flange 80 by using bolts; and after the low-temperature sealant is completely solidified, covering the heat-insulating cover plate 12, adhering the heat-insulating shell 11 and the heat-insulating cover plate 12 by using the low-temperature sealant, and winding a glass fiber rope outside the heat-insulating shell for reinforcement.
As can be seen from the above description, compared with the prior art, the implementation of the present invention has the following advantages: the insulation box containing liquid nitrogen is provided, the shielding layer joint box, the C joint box, the B joint box and the C joint box are coaxially arranged in the insulation box from outside to inside, each joint box is respectively connected with the shielding layer and the conductor layer of the superconducting cable, so that the electric connection of the two superconducting cables is realized, meanwhile, the joint boxes are all circular tube structures formed by buckling two hollow semi-cylindrical structures, and are filled with the liquid nitrogen, so that the electric insulation between corresponding elements is realized; liquid nitrogen is also contained in the heat insulation box, so that the intermediate joint can be kept at the temperature below 77 k; the intermediate joint of the embodiment can be widely applied to the requirement of the superconducting cable for laying in the environments of cable trenches, cable tunnels, cable bridges and the like.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. An intermediate joint for a three-phase coaxial superconducting alternating current cable, comprising:
a heat insulating box containing liquid nitrogen, wherein two ends of the heat insulating box are respectively connected with the first superconducting cable and the second superconducting cable;
the shielding layer joint box, the C-joint box, the B-joint box and the C-joint box are accommodated in the heat insulation box and are coaxially arranged from outside to inside; the shielding layer joint boxes are respectively connected with shielding layers of the first superconducting cable and the second superconducting cable, the C-phase joint boxes are respectively connected with C-phase conductor layers of the first superconducting cable and the second superconducting cable, the B-phase joint boxes are respectively connected with B-phase conductor layers of the first superconducting cable and the second superconducting cable, and the A-phase joint boxes are respectively connected with A-phase conductor layers connecting the first superconducting cable and the second superconducting cable; and the liquid nitrogen return pipe joints are respectively connected with the liquid nitrogen return pipes of the first superconducting cable and the second superconducting cable.
2. The intermediate joint according to claim 1, wherein the heat insulating box comprises a heat insulating outer shell and a heat insulating cover plate, the heat insulating outer shell having a rectangular opening side for fitting with the heat insulating cover plate; the heat insulation shell is provided with a heat insulation groove below the rectangular opening side and used for accommodating the shielding layer joint box, the C-joint box, the B-joint box, the C-joint box and the liquid nitrogen backflow pipe joint, and liquid nitrogen is contained in the heat insulation groove.
3. The intermediate joint as claimed in claim 2, wherein the insulating housing is symmetrically provided at both ends thereof with connection pipes connected to the first superconducting cable through a first cable connection flange and connected to the second superconducting cable through a second cable connection flange.
4. The intermediate joint as claimed in claim 2, wherein the insulating cover plate has a hollow structure inside, and is evacuated and filled with insulating perlite.
5. The intermediate joint as claimed in claim 2, wherein the insulating shell and the insulating cover plate are connected by a low temperature sealant and reinforced by wrapping a glass fiber rope on the outside.
6. The intermediate joint according to claim 1, wherein the shielding layer joint box, the C joint box, the B joint box and the C joint box are all circular tube structures formed by buckling two hollow semi-cylindrical structures.
7. The intermediate joint as claimed in claim 6, wherein the shield layer joint box includes a first round pipe part and first conductive connection parts provided at both ends of the first round pipe part, the first conductive connection parts being in contact with the shield conductor layers of the first and second superconducting cables, respectively, the first round pipe part being filled with liquid nitrogen to achieve electrical insulation of the shield layer joint box from the C-phase conductor layers of the first and second superconducting cables;
the C-phase connector box comprises a second round pipe part and second conductive connecting parts arranged at two ends of the second round pipe part, the second conductive connecting parts are respectively contacted with C-phase conductor layers of the first superconducting cable and the second superconducting cable, and the second round pipe part is filled with liquid nitrogen to realize the electrical insulation between the C-phase connector box and B-phase conductors of the first superconducting cable and the second superconducting cable;
the B-phase connector box comprises a third round pipe part and third conductive connecting parts arranged at two ends of the third round pipe part, the third conductive connecting parts are respectively contacted with B-phase conductor layers of the first superconducting cable and the second superconducting cable, and the third round pipe part is filled with liquid nitrogen to realize the electric insulation between the B-phase connector box and A-phase conductors of the first superconducting cable and the second superconducting cable;
the A-phase connector box comprises a fourth round pipe part and fourth conductive connecting parts arranged at two ends of the fourth round pipe part, the fourth conductive connecting parts are respectively contacted with the A-phase conductor layers of the first superconducting cable and the second superconducting cable, and the fourth round pipe part is filled with liquid nitrogen to realize the electric insulation between the A-phase connector box and the liquid nitrogen return pipes of the first superconducting cable and the second superconducting cable.
8. The intermediate joint of claim 6, wherein the shield layer joint box and the insulated housing are filled with liquid nitrogen to electrically insulate the shield layer joint box from the insulated housing.
9. The intermediate joint as claimed in claim 1, wherein the liquid nitrogen return pipe joint has a hexagonal fitting portion on an outer surface thereof for cooperating with an open wrench to tighten and loosen the liquid nitrogen return pipe joint; the left end and the right end in the liquid nitrogen backflow pipe joint are respectively provided with left-handed threads and right-handed threads, the liquid nitrogen backflow pipe joint is connected with a male head of the left-handed threads through the left-handed threads and is connected with a male head of the right-handed threads, the male head of the right-handed threads is welded with a liquid nitrogen backflow pipe of a first superconducting cable, and the male head of the left-handed threads is welded with a liquid nitrogen backflow pipe of a second superconducting cable, so that the liquid nitrogen backflow pipes of the first superconducting cable and the second superconducting cable are connected with each other.
10. The intermediate joint according to claim 1, wherein the radial gap between the shield layer joint box, the C-joint box, the B-joint box and the C-joint box is 10mm, and the axial gap is 100 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111539904.8A CN114242334B (en) | 2021-12-16 | 2021-12-16 | Intermediate joint of three-phase coaxial superconducting alternating current cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111539904.8A CN114242334B (en) | 2021-12-16 | 2021-12-16 | Intermediate joint of three-phase coaxial superconducting alternating current cable |
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| CN114242334A true CN114242334A (en) | 2022-03-25 |
| CN114242334B CN114242334B (en) | 2024-05-24 |
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| JP2011045169A (en) * | 2009-08-19 | 2011-03-03 | Sumitomo Electric Ind Ltd | Intermediate connection structure of superconducting cable |
| JP2015026614A (en) * | 2013-07-25 | 2015-02-05 | ネクサン | Method for conductively coupling two superconducting cables |
| JP2018007470A (en) * | 2016-07-05 | 2018-01-11 | 住友電気工業株式会社 | Intermediate connection structure for superconducting cable |
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| CN109861163A (en) * | 2019-01-17 | 2019-06-07 | 国网江苏省电力有限公司 | Transfer device and transfer method for three-phase coaxial superconducting cable to three-core superconducting cable |
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| US20070169957A1 (en) * | 2004-03-04 | 2007-07-26 | Sumitomo Electric Industries, Ltd | Splice structure of superconducting cable |
| JP2011045169A (en) * | 2009-08-19 | 2011-03-03 | Sumitomo Electric Ind Ltd | Intermediate connection structure of superconducting cable |
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| JP2018007470A (en) * | 2016-07-05 | 2018-01-11 | 住友電気工業株式会社 | Intermediate connection structure for superconducting cable |
| CN108682490A (en) * | 2018-06-08 | 2018-10-19 | 东部超导科技（苏州）有限公司 | High current density circle stack high-temperature superconductor degaussing cable structure |
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