CN217508257U - Stress cone of three-phase coaxial superconducting cable - Google Patents
Stress cone of three-phase coaxial superconducting cable Download PDFInfo
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- CN217508257U CN217508257U CN202123414818.2U CN202123414818U CN217508257U CN 217508257 U CN217508257 U CN 217508257U CN 202123414818 U CN202123414818 U CN 202123414818U CN 217508257 U CN217508257 U CN 217508257U
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Abstract
The utility model relates to a stress cone of a three-phase coaxial superconducting cable, which comprises a semi-conducting layer, wherein the front part of the semi-conducting layer is coated on the peripheral surface of a conductor layer of the three-phase coaxial superconducting cable, and the rear part of the semi-conducting layer is in a horn-shaped cone structure and is far away from the peripheral surface of the conductor layer of the three-phase coaxial superconducting cable; the rear inner surface of the semiconductive layer comprises a reinforcing insulating layer; the outer peripheral surface of the semiconductive layer includes an outer semiconductive self-adhesive layer, and an inner semiconductive self-adhesive layer between the rear portion of the semiconductive layer and the reinforcing insulating layer. The utility model discloses a stress cone is applied to three-phase coaxial superconducting cable and has the advantage of lightweight, low-cost, workable installation.
Description
Technical Field
The utility model relates to a cable accessories technical field, concretely relates to coaxial superconducting cable's of three-phase stress cone.
Background
The stress cone is a rubber-plastic module which is wrapped by an insulating tape in a cable terminal or a cable joint or sleeved on a cable insulating core and is similar to an olive shape, so that the insulating diameter of the cable is gradually enlarged into a cone to control the axial stress of the cable. A cable terminal with voltage of 10kV or above is provided with a stress cone no matter a shielded cable, a lead separating cable or a single-core cable. In a cable joint or terminal, in order to connect a conductor with a conductor or other electrical equipment, a cable metal sleeve and an insulating layer are cut off and stripped, and after the conductor is connected, the insulating layer and the metal sleeve are recovered. Axial stresses are present in both the joint and the termination due to the inability to maintain the same thickness of the insulation and the same configuration of the metal jacket and the cable body at the joint or termination. In order to control the axial stress, the principle of gradually reducing the capacitance is utilized within an allowable range, namely, the original insulation thickness of the cable is gradually increased, so that the electric field intensity on the insulation surface is gradually reduced, the ionization line density is evacuated, and the free voltage of a transition interface is improved. The stress cone has the functions of improving the electric field distribution at the tail end of the metal sheath and reducing the electric field intensity at the edge of the metal sheath. In the cable terminal and the joint, an insulating tape (or a rubber and plastic prefabricated part) is wrapped around the edge of the metal sheath, so that a stress cone is formed between the edge of the metal sheath and the outer surface of the wrapped insulation. The general cone shape of the stress cone is designed according to the surface axial field intensity of the stress cone is equal to or less than the maximum allowable axial field intensity.
The three-phase coaxial superconducting cable has a compact structure, three phases are wound on the same copper framework, and meanwhile, in order to improve the cooling efficiency, the inner support body adopts a metal pipe to provide a liquid nitrogen cooling channel; compared with the common single-phase and three-phase parallel superconducting cable system, the structure saves the volume of the outer side heat-insulating layer and the using amount of insulating materials, and can reduce the hysteresis loss of the whole system and save the cost because the three-phase magnetic fields are mutually offset. The three-phase coaxial high-temperature superconducting cable has the advantages of small occupied space, high integration level, less consumption of superconducting strips and the like, and the treatment of an electric field at the tail end of a superconducting layer of the cable is the key for ensuring the long-term stable operation of the superconducting cable. For a superconducting cable with a three-phase coaxial structure, the portability, compactness and reliability of the stress cone design are particularly important due to the limited inner space of the dewar. The existing stress cone for the three-phase coaxial high-temperature superconducting cable has the disadvantages of large structural design size, high process processing difficulty and high practical application cost. The design of the stress cone not only needs to realize the effect of homogenizing an electric field, but also needs to fully consider the convenience and the economy of practical engineering application, minimize the volume as much as possible, reduce the occupied space and highlight the advantages of a three-phase coaxial structure.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems of large structural design size and poor convenience and economy of the stress cone of the existing three-phase coaxial superconducting cable, the stress cone of the three-phase coaxial superconducting cable is provided. The utility model discloses a stress cone is applied to the coaxial superconducting cable of three-phase and has the advantage of lightweight, low cost, workable installation.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a stress cone of a three-phase coaxial superconducting cable comprises a semi-conducting layer, the front part of the semi-conducting layer is coated and arranged on the peripheral surface of a conductor layer of the three-phase coaxial superconducting cable, and the rear part of the semi-conducting layer is in a horn-shaped cone structure and is far away from the peripheral surface of the conductor layer of the three-phase coaxial superconducting cable.
Furthermore, the inner surface of the rear part of the semi-conducting layer is provided with a reinforced insulating layer which plays a role of supporting the semi-conducting layer and can increase the interface discharge distance; the outer circumference surface of the semi-conducting layer is provided with an outer semi-conducting self-adhesive layer, and an inner semi-conducting self-adhesive layer is arranged between the rear part of the semi-conducting layer and the reinforced insulating layer. The inner and outer semi-conductive self-adhesive layers play a role in enhancing the surface of the insulating layer and the surface of the smooth semi-conductive layer in a smooth mode, and the smoothness of the surface of the semi-conductive layer plays a role in uniformly dispersing an electric field.
Still further, the semiconductive layer is made of a material having a volume resistivity of 10 4 -10 8 The preferred semi-conductive rubber-plastic material has a volume resistivity of 10 ^ cm 5 Omega cm semiconductive rubber plastic materials; the materials of the inner semi-conductive self-adhesive layer and the outer semi-conductive self-adhesive layer are semi-conductive self-adhesive tapes; the reinforced insulating layer is made of composite paper insulating material.
Further, the transverse length of the stress cone is 45-60mm, the curvature of the inner surface of the trumpet-shaped cone structure is 0.005-0.008, and the curvature of the outer surface of the trumpet-shaped cone structure is 0.006-0.01.
Further, the starting thickness of the semiconductive layer is 0.15mm, and the front portion of the semiconductive layer is provided so as to cover the outer peripheral surface of the conductor layer of the three-phase coaxial superconducting cable in a stepped shape and is in contact with the outer peripheral surface of the conductor layer of the three-phase coaxial superconducting cable by crimping; a contact length of a front portion of the semiconductive layer with an outer peripheral surface of a conductor layer of the three-phase coaxial superconducting cable is 5 to 10 mm; the lateral length of the rear part of the semiconducting layer is 15-20 mm.
Further, the thickness of the reinforced insulating layer is 8-9 mm; the transverse length of the reinforced insulating layer is 13-20 mm.
Further, the heights of the rear part of the semiconductive layer and the reinforcing insulating layer were each 8.5 mm.
The beneficial technical effects are as follows:
the utility model discloses according to the structural parameter of the coaxial superconducting cable of three-phase, establish the stress cone simulation model of its adaptation through finite element analysis software, accomplish the curve design and the structural dimension design of stress cone. Compared with the existing design, the semi-conductive rubber plastic material is wound outside the reinforced insulating layer to obtain the semi-conductive layer, and the semi-conductive self-adhesive tape is wound on the surfaces of the semi-conductive layer and the reinforced insulating layer to ensure smooth surface and high material combination degree, so that the formed stress cone has more stable structure, lighter weight, easy processing and installation, cost saving, and fills the blank of the domestic three-core coaxial superconducting cable stress cone in the practical requirements of engineering application, and has substantial design significance.
Drawings
Fig. 1 is a schematic structural view of a cross section of a stress cone of a three-phase coaxial superconducting cable according to the present invention.
Fig. 2 is a schematic sectional view of a three-phase coaxial superconducting cable body.
Fig. 3 is a schematic structural diagram of a stress cone three-dimensional simulation model of a three-phase coaxial superconducting cable.
Fig. 4 is a stress cone curve cross-sectional coordinate diagram of the three-phase coaxial superconducting cable.
Detailed Description
The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only 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.
In the description of the present invention, it should be noted that the directions or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and "third" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the scope of the invention is not limited thereto.
Example 1
The cross-sectional structure of the three-phase coaxial superconducting cable body is shown in fig. 2, and the structure from inside to outside is as follows: inner supporting layer 7, conductor layer 2, insulating layer 1, shielding layer 3, conductor layer 2 all sets up the three-layer with insulating layer 1, sets up one deck insulating layer 1 outward according to one deck conductor layer 2 and arranges. The inner supporting layer 7 is internally provided with a liquid nitrogen channel (the geometric parameter is 29mm), the thickness of the inner supporting layer 7 is 0.5mm, the thickness of each of the three conductor layers 2 is 0.2mm, the thickness of each of the three insulating layers 1 is 2mm, and the thickness of the shielding layer 3 is 0.5 mm.
The stress cone of the three-phase coaxial superconducting cable is designed, the three conductor layers 2 are respectively exposed by stripping the corresponding layers of the three-phase coaxial superconducting cable body, the three stress cones are arranged on the outer peripheral surfaces of the three conductor layers 2, another stress cone is arranged on the outer peripheral surface of the outermost insulation layer 1, the stress cone is connected with the insulation layer 1 of the three-phase coaxial superconducting cable, namely, as shown in the frame in figure 1, the stress cone connected with the three conductor layers 2 is shown in figure 1.
A schematic cross-sectional structure of a stress cone of the three-phase coaxial superconducting cable is shown in fig. 1, wherein the stress cone comprises a semi-conducting layer 5, the front part of the semi-conducting layer 5 is coated and arranged on the outer peripheral surface of a conductor layer 2 of the three-phase coaxial superconducting cable, and the rear part of the semi-conducting layer 5 is in a horn-shaped cone structure and is far away from the outer peripheral surface of the conductor layer 2 of the three-phase coaxial superconducting cable; the inner surface of the rear part of the semi-conducting layer 5 is also provided with a reinforcing insulating layer 6, the reinforcing insulating layer 6 plays a role of supporting a horn-shaped cone structure at the rear part of the semi-conducting layer 5, and the interface discharge distance can be increased; an outer semi-conductive self-adhesive layer 42 is arranged on the whole peripheral surface of the semi-conductive layer 5, and an inner semi-conductive self-adhesive layer 41 is arranged between the rear part of the semi-conductive layer 5 and the reinforced insulating layer 6. The inner semi-conductive self-adhesive layer 41 and the outer semi-conductive self-adhesive layer 42 play a role of enhancing the surface of the insulating layer 6 and the smooth surface of the semi-conductive layer 5 smoothly, and the smoothness of the surface of the semi-conductive layer 5 plays a role of uniformly dispersing an electric field.
Wherein the semiconductive layer 5 is made of a material having a volume resistivity of 1.0X 10 5 Omega cm semiconductive rubber plastic materials; the materials of the inner semi-conductive self-adhesive layer 41 and the outer semi-conductive self-adhesive layer 42 are semi-conductive self-adhesive tapes; the reinforced insulating layer 6 is made of composite paper insulating material.
Aiming at the structural parameters of the three-phase coaxial superconducting cable body with the voltage class of 10kV, the winding inner diameter range of the semi-conducting layer 5 in the structure of the stress cone is determined to be 25-30 mm. The resistivity of the conductor layer 2 is zero at the liquid nitrogen temperature (77K) by default, namely, Joule heat is not generated when the conductor layer 2 is through-flow; since there is a contact resistance between the conductor layer 2 and the semiconductive layer 5, the magnitude of the contact resistance is related to the contact area, the pressure of the contact portion, and the like. Verifying whether the contact point of the semi-conductive layer 5 and the conductor layer 2 is overheated below the critical temperature of the conductor strip under the condition of satisfying the through-flow, calculating appropriate contact resistance through simulation, determining the crimping contact length of the semi-conductive layer 5 and the conductor layer 2, and obtaining the contact length between the front part of the semi-conductive layer 5 and the outer peripheral surface of the conductor layer 2 of the three-phase coaxial superconducting cable within the range of 5-10 mm.
According to the body structure parameters of the 10kV three-phase coaxial superconducting cable, modeling is carried out on a cable stress cone by utilizing finite element simulation software, and a stress cone three-dimensional model of the three-phase coaxial superconducting cable is established, wherein the stress cone three-dimensional simulation model structure is shown in figure 3, and figure 3 comprises a current lead C, a stress cone A and a three-phase coaxial superconducting cable B. Fig. 4 shows a graph of the curve of the stress cone cross section (i.e., the trumpet-shaped end), in which curve 1 is the curve of the inner side surface of the trumpet-shaped cone structure at the rear of the semiconductive layer 5, curve 2 is the curve of the outer side surface of the trumpet-shaped cone structure at the rear of the semiconductive layer 5, the curvature of curve 1 is 0.0076, and the curvature of curve 2 is 0.0084. The structural dimensions of the stress cone of a specific simulation design are shown in table 1.
TABLE 1 stress cone structural size of single three-phase coaxial superconducting cable
(note: the longitudinal length indicates the length from the semiconductive layer 5 and the reinforcing insulation layer 6 to the conductor layer 2 of the three-phase coaxial superconducting cable, and is 8.5 mm; the initial thickness indicates the thickness of the semiconductive layer 5 at the junction of the stress cone and the three-phase coaxial superconducting cable)
Preparation: winding semi-conductive rubber-plastic material around the outer surface of the conductor layer 2 of the three-phase coaxial superconducting cable in a ladder shape to be pressed to obtain the front part of the semi-conductive layer 5, then using a design curve caliper to compare and continue to wind the semi-conductive rubber-plastic material into a horn-shaped cone structure far away from the outer surface of the conductor layer 2 of the three-phase coaxial superconducting cable, so that the radian and the curvature of the horn-shaped cone structure reach the design requirements to obtain the rear part of the semi-conductive layer 5, the front part and the rear part of the semi-conductive layer 5 are integrated, winding the semi-conductive self-adhesive tape on the inner surface of the rear part of the semi-conductive layer 5 to prepare an inner semi-conductive self-adhesive layer 41 with the function of a smooth surface, winding the composite paper insulating material on the inner surface of the semi-conductive self-adhesive layer 41 to prepare a reinforcing insulating layer 6 to support the rear part of the semi-conductive layer 5, winding the semi-conductive self-adhesive tape on the whole outer surface of the semi-conductive layer 5 to prepare an outer semi-conductive self-adhesive layer 42, so that the outer surface of the semiconducting layer 5 is smooth and the aim of evenly dispersing the electric field is achieved.
Carry out the electromagnetic field simulation through electric current physics interface to the stress cone three-dimensional model in table 1 size and figure 3, its electromagnetic field simulation result can know, and electric field distribution is comparatively even, though also there is the electric field phenomenon of concentrating, but the electric field intensity maximum value is about 20kV/mm, is no longer than its saturated insulating strength 35kV/mm in the liquid nitrogen, so can not take place to puncture the discharge phenomenon, the utility model discloses a stress cone satisfies the designing requirement.
Claims (7)
1. A stress cone of a three-phase coaxial superconducting cable, characterized in that the stress cone comprises a semiconducting layer (5), the front part of the semiconducting layer (5) is arranged on the outer peripheral surface of a conductor layer (2) of the three-phase coaxial superconducting cable, and the rear part of the semiconducting layer (5) is in a horn-shaped cone structure and is far away from the outer peripheral surface of the conductor layer (2) of the three-phase coaxial superconducting cable.
2. A stress cone for a three-phase coaxial superconducting cable according to claim 1, wherein a rear inner surface of the semiconductive layer (5) is provided with a reinforcing insulation layer (6); the outer peripheral surface of semi-conductive layer (5) is equipped with outer semi-conductive self-adhesive layer (42), is equipped with interior semi-conductive self-adhesive layer (41) between the rear portion of semi-conductive layer (5) and reinforcing insulating layer (6).
3. A stress cone for a three-phase coaxial superconducting cable according to claim 2, whereinCharacterized in that the semiconductive layer (5) is made of a material having a volume resistivity of 10 4 -10 8 Omega cm semiconductive rubber plastic materials; the materials of the inner semi-conductive self-adhesive layer (41) and the outer semi-conductive self-adhesive layer (42) are semi-conductive self-adhesive tapes; the reinforced insulating layer (6) is made of composite paper insulating material.
4. A stress cone for a three-phase coaxial superconducting cable according to any one of claims 1 to 3, wherein the stress cone has a transverse length of 45 to 60mm, and the curvature of the inner surface of the horn-like cone structure is 0.005 to 0.008 and the curvature of the outer surface thereof is 0.006 to 0.01.
5. A stress cone for a three-phase coaxial superconducting cable according to any one of claims 1 to 3, wherein the starting thickness of the semiconducting layer (5) is 0.15 mm; the front part of the semi-conducting layer (5) is coated and arranged on the outer peripheral surface of the conductor layer (2) of the three-phase coaxial superconducting cable in a step shape; the contact length of the front part of the semi-conducting layer (5) and the outer peripheral surface of the conductor layer (2) of the three-phase coaxial superconducting cable is 5-10 mm; the lateral length of the rear part of the semiconducting layer (5) is 15-20 mm.
6. Stress cone for a three-phase coaxial superconducting cable according to claim 2, characterized in that the thickness of the reinforcing insulating layer (6) is 8-9 mm; the transverse length of the reinforced insulating layer (6) is 13-20 mm.
7. The stress cone of a three-phase coaxial superconducting cable according to claim 2, wherein the heights of the rear portion of the semiconductive layer (5) and the reinforcing insulation layer (6) are 8.5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123414818.2U CN217508257U (en) | 2021-12-31 | 2021-12-31 | Stress cone of three-phase coaxial superconducting cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123414818.2U CN217508257U (en) | 2021-12-31 | 2021-12-31 | Stress cone of three-phase coaxial superconducting cable |
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| CN217508257U true CN217508257U (en) | 2022-09-27 |
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