CN213185464U - Prefabricated welding type cable insulation joint - Google Patents
Prefabricated welding type cable insulation joint Download PDFInfo
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- CN213185464U CN213185464U CN202021609466.9U CN202021609466U CN213185464U CN 213185464 U CN213185464 U CN 213185464U CN 202021609466 U CN202021609466 U CN 202021609466U CN 213185464 U CN213185464 U CN 213185464U
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Abstract
The utility model discloses a prefabricated welding type cable insulation joint and a manufacturing method thereof, and discloses a joint conductor connecting layer, an inner semi-conductive connecting layer, an insulation recovery layer, a first insulation recovery layer, a second insulation recovery layer, a first outer semi-conductive layer and a second outer semi-conductive layer; the prefabricated membranes or modules of all layers are manufactured in advance indoors, and then the prefabricated membranes or modules are restored layer by layer on a construction site, so that the influences of uncontrollable factors of site construction and severe environment on the quality of a joint can be avoided, in addition, an annular groove is formed in the first prefabricated insulation module along the axial direction, an annular prefabricated outer semiconductor membrane is arranged in the annular groove and is heated and pressurized together with the second prefabricated insulation module, the one-time integral molding of the first semiconductor layer, the first insulation restoration layer and the second insulation restoration layer can be realized, the structure that the first semiconductor layer is embedded in the first insulation restoration layer can also be synchronously realized, the joint restoration time can be further shortened to 2-3 hours, and the manufacturing efficiency is improved.
Description
Technical Field
The utility model relates to a high voltage power cable connecting piece, in particular to prefabricated butt fusion formula cable insulation connects.
Background
Due to the limitation of factors such as production technology, field and transportation of the power cable, the general length of the power cable is 500-1000 meters/coil, but the lead-out lines of urban underground power grids and power stations, internal power supply of industrial and mining enterprises and underwater power transmission lines crossing rivers and sea are very long, so that each coil of the power cable needs to be connected to meet the requirement of power transmission.
At present, a cable connecting joint in medium-voltage and high-voltage fields is usually formed by field construction connection, an inner semi-conducting layer, a first outer semi-conducting layer and a second outer semi-conducting layer are usually wound with a semi-conducting wrapping tape on a conductor, and then a cross-linked polyethylene vulcanized tape which is made of the same material as a cable insulating layer is adopted for winding recovery, so that the quality of the joint cannot be guaranteed under the influence of field environment, and the condition of electric field leakage is easy to occur;
in addition, the insulation layer is recovered by adopting a cross-linked polyethylene material die injection molding similar to cable insulation and is fused with the cable insulation layer and the shielding layer into a whole, although the mode reduces the influence of environmental factors on the quality of the joint and shortens the construction time to 5-7 hours, equipment such as an extrusion machine, a temperature monitoring device and the like needs to be matched in the construction process, the temperature of materials in a machine body is difficult to control in the extrusion process, the scorching phenomenon easily occurs, and the condition that the extruder is not cleaned on site has certain dispersity in the quality of the joint.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a prefabricated butt fusion formula cable insulation connects can carry out the scene through prefabricated recovery module and resume, avoids the uncontrollable factor of site operation, shortens process flow and time simultaneously, improves product quality and security performance.
According to the utility model discloses a prefabricated welded cable insulation connects of first aspect embodiment, a serial communication port, include: the conductor connecting layer is formed by connecting two sections of conductors needing to be spliced; the inner semi-conductive connecting layer is arranged on the outer surface of the conductor connecting layer and is fused and combined with the inner semi-conductive layers of the cable bodies at two ends needing to be spliced or repaired; the first insulation recovery layer is arranged on the outer surface of the inner semi-conductive connecting layer, and one end of the first insulation recovery layer is fused, combined and crosslinked with the insulation layer of the cable body at one end which needs to be spliced or repaired; one end of the second insulation recovery layer is fused and combined with the insulation layer of the cable body and is crosslinked, and the other end of the second insulation recovery layer is fused and combined with the first insulation recovery layer and is crosslinked; a first outer semiconductive layer embedded within said first insulation recovery layer at least near one end of said second insulation recovery layer; and a second outer semiconductive layer provided on an outer surface of the second insulation recovery layer and extending to an outer surface of the first insulation recovery layer, wherein the first outer semiconductive layer and the second outer semiconductive layer are partially overlapped in an axial direction or flush with adjacent end surfaces, and the overlapped portion or the flush with adjacent end surfaces is disconnected in a radial direction.
According to the utility model discloses prefabricated butt fusion formula cable insulation connects has following beneficial effect at least: the first and second insulating layers, the first and second outer semiconductive layers, and the first outer semiconductive layer are embedded in the first insulation recovery layer at least near one end of the second insulation recovery layer; the second outer semi-conducting layer is arranged on the outer surface of the second insulation recovery layer and can extend to the outer surface of the first insulation recovery layer, the first outer semi-conducting layer and the second outer semi-conducting layer are partially overlapped or flush with the adjacent end surfaces along the axial direction, and the overlapped part or the flush part of the adjacent end surfaces is disconnected along the radial direction, so that the field intensity coming out of the first outer semi-conducting layer can be intercepted by the second outer semi-conducting layer, and further, the field intensity is prevented from leaking out and forming a passage with an outer shield to cause safety accidents;
according to some embodiments of the invention, the first outer semiconducting layer and the second outer semiconducting layer are insulated at the overlapping location or at the location where the adjacent end faces are level.
According to some embodiments of the present invention, the inner semi-conductive connection layer is an inner semi-conductive layer structure formed by a prefabricated semiconductor die mounted on the periphery of the conductor connection layer and heated, pressurized, melted and combined with the inner semi-conductive layers of the two sections of cable bodies to be spliced or repaired; the pre-manufactured semiconductor die is manufactured in a factory closed clean environment, the semiconductor die is compositely manufactured on a cable core at a cable connection position on site to form a conductor shielding layer consistent with the cable core, and the shielding field intensity of an equivalent cable conductor is uniformly distributed.
According to the utility model discloses a some embodiments, first insulation resumes layer, second insulation and resumes layer and first outer semi-conductive layer and connect the shaping through the disposable melting of prefabricated module, adopt the disposable melting of prefabricated module to connect the shaping and not only can avoid site environment to the influence in product quality and life-span, can also reduce the engineering time greatly.
According to some embodiments of the invention, the premold module comprises: the semiconductor module comprises a first prefabricated insulation module, a second prefabricated insulation module and an annular prefabricated outer semiconductor die piece, wherein an annular groove is formed in the first prefabricated insulation module along the axial direction, and the annular prefabricated outer semiconductor die piece is arranged in the annular groove.
According to some embodiments of the invention, the end surfaces of the first and second outer semiconducting layers are both smooth arc surfaces; the field intensity distribution can be uniform, and the local discharge caused by the local field intensity aggregation can be avoided.
According to some embodiments of the invention, the second outer semiconductive layer comprises, in order from the inside out, a semiconductive paint layer and a semiconductive layer.
According to some embodiments of the present invention, the first outer semi-conductive layer is made of the same material as the outer semi-conductive layer of the cable body to be spliced or repaired, and the first and second insulation recovery layers are made of the same material as the insulation layer of the cable body to be spliced or repaired; the melting combination of each layer of the connector and each layer of the body can be better realized by adopting the same material as the cable body.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is an exploded view of an insulated joint according to an embodiment of the present invention before welding;
fig. 2 is a schematic structural diagram of the insulated joint according to the embodiment of the present invention after welding.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the present number, and the terms greater than, less than, within, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 2, a prefabricated fusion-spliced cable insulation joint according to an embodiment of the first aspect of the present invention includes, in order from inside to outside, a conductor connection layer 1, an inner semiconductive connection layer 2, an insulation restoration layer, and an outer semiconductive layer, the insulation restoration layer including a first insulation restoration layer 3 and a second insulation restoration layer 4, the outer semiconductive layer including a first outer semiconductive layer 5 and a second outer semiconductive layer 6;
the conductor connecting layer 1 is formed by connecting two sections of conductors which need to be connected, and the connecting mode can adopt explosive welding or electromagnetic induction eddy current welding; the inner semi-conductive connecting layer 2 is arranged on the outer surface of the conductor connecting layer 1 and is fused and combined with the inner semi-conductive layers of the cable bodies at two ends needing to be spliced or repaired; the first insulation recovery layer 3 is arranged on the outer surface of the inner semi-conductive electric connection layer 2, and one end of the first insulation recovery layer is fused and combined with the insulation layer of the cable body at one end needing to be spliced or repaired and is crosslinked; the second insulation recovery layer 4 is arranged on the outer surface of the inner semi-conductor electric connection layer 2, one end of the second insulation recovery layer is fused and combined with the insulation layer of the cable body and is crosslinked, and the other end of the second insulation recovery layer is fused and combined with the first insulation recovery layer 3 and is crosslinked; a first outer semiconductive layer 5 embedded in the first insulation-recovery layer 3 at least near one end of the second insulation-recovery layer 4; the second outer semiconductive layer 6 is provided on the outer surface of the second insulation recovery layer 4 and can extend to the outer surface of the first insulation recovery layer 3, the first outer semiconductive layer 5 and the second outer semiconductive layer 6 are partially overlapped in the axial direction or flush with the adjacent end faces, and the overlapped portion or flush with the adjacent end faces is disconnected in the radial direction; as long as the adjacent end faces of the first outer semiconducting layer 5 and the second outer semiconducting layer 6 are just flush, i.e. the offset just overlaps, the field strength coming out of the first outer semiconducting layer can be intercepted by the second outer semiconducting layer, thereby preventing the field strength from leaking out and forming a path with the outer shield to cause safety accidents, although the offset of the second outer semiconducting layer 6 covers part of the first outer semiconducting layer 5, which only consumes some materials.
The specific part of the first outer semiconductive layer 5 overlapping with the second outer semiconductive layer 6 or the part with flush adjacent end faces is insulated and the thickness of the insulation in the part is generally not more than 20 mm, and the optimal thickness can be determined according to the electric field intensity.
In some embodiments of the present invention, the inner semi-conductive connection layer 2 is an inner semi-conductive layer structure formed by a prefabricated semiconductor die installed on the periphery of the conductor connection layer, heated, pressurized, melted and combined, and is identical to the inner semi-conductive layers of the two sections of cable bodies needing to be spliced or repaired; the pre-manufactured semiconductor die is manufactured in a factory closed clean environment, the semiconductor die is compositely manufactured on a cable core at a cable connection position on site to form a conductor shielding layer consistent with the cable core, and the shielding field intensity of an equivalent cable conductor is uniformly distributed.
The utility model discloses a in some embodiments, first insulation recovery layer 3, second insulation recovery layer 4 and first outer semi-conductive layer 5 are once only melted through prefabricated module and are connected the shaping, adopt the once only melting of prefabricated module to connect the shaping and not only can avoid the on-the-spot environment to the influence in product quality and life-span, can also reduce the engineering time greatly.
In some embodiments of the present invention, the prefabricated module comprises: the structure can realize one-time integral molding of the first insulation recovery layer 3, the second insulation recovery layer 4 and the first outer semi-conducting layer 5.
In some embodiments of the present invention, the end surfaces of the first outer semiconductive layer 5 and the second outer semiconductive layer 6 are both smooth arc surfaces; the field intensity distribution can be uniform, and the local discharge caused by the local field intensity aggregation can be avoided.
In some embodiments of the present invention, the second outer semiconductive layer 6 comprises, from the inside to the outside, a semiconductive paint layer and a semiconductive tape layer in this order; the same material as the outer semiconductive layer material of the cable body to be spliced or repaired can also be used for melt recovery.
In some embodiments of the present invention, the material used for the first outer semi-conductive layer 5 is the same as the material of the outer semi-conductive layer to be spliced or repaired, and the material used for the first and second insulation recovery layers 3 and 4 is the same as the material of the insulation layer to be spliced or repaired; the melting combination of each layer of the connector and each layer of the body can be better realized by adopting the same material as the cable body.
With further reference to fig. 1-2, a method of manufacturing a prefabricated welded cable insulation joint according to an embodiment of the second aspect of the present invention includes the steps of:
the restoring conductor connecting layer can adopt explosive welding or electromagnetic induction eddy current welding;
arranging a prefabricated inner semiconductor membrane outside the recovered conductor connecting layer, heating and pressurizing the prefabricated inner semiconductor membrane to enable the prefabricated inner semiconductor membrane to be fused, crosslinked and tightly combined on the conductor connecting layer, and seamlessly fused, combined and crosslinked with the inner semi-conducting layers of the two sections of cable bodies needing to be spliced or repaired to form an inner semi-conducting connecting layer;
a first prefabricated insulation module and a second prefabricated insulation module are arranged outside the inner semi-conductive connecting layer, the first prefabricated insulation module is provided with an annular groove along the axial direction, and an annular prefabricated outer semi-conductive die sheet is arranged in the annular groove; heating and pressurizing the first prefabricated insulation module, the second prefabricated insulation module and the prefabricated outer semiconductor die to form a first insulation recovery layer, a second insulation recovery layer and a first outer semiconductor layer, wherein the ends, far away from each other, of the first insulation recovery layer and the second insulation recovery layer are respectively fused, combined and crosslinked with the insulation layer of the corresponding cable body, the adjacent ends are fused, combined and crosslinked with each other, and the first outer semiconductor layer is combined and crosslinked with the first insulation recovery layer; the inner sides of the first insulation recovery layer and the second insulation recovery layer are crosslinked and tightly bonded to the inner semiconductive layer;
the second outer semiconducting layer is restored outside the first insulation-restoring layer and the second insulation-restoring layer, the end faces of the second outer semiconducting layer being flush with the end faces of the first outer semiconducting layer, or the second outer semiconducting layer partially overlapping the first outer semiconducting layer.
The prefabricated membranes or modules of each layer are manufactured indoors in advance, and then the prefabricated membranes or modules are restored layer by layer on a construction site, so that the influences of uncontrollable factors of site construction and severe environment on the quality of the joint can be avoided, meanwhile, the restoration time of the joint can be shortened to 2-3 hours, and the manufacturing efficiency, the product quality and the safety performance are improved; in addition, the annular groove is formed in the first prefabricated insulating module in the axial direction, the annular prefabricated outer semiconductor die is arranged in the annular groove, and then the annular prefabricated outer semiconductor die and the second prefabricated insulating module are heated and pressurized together, so that the first semiconductor layer, the first insulating recovery layer and the second insulating recovery layer can be formed in one-time, the structure that the first semiconductor layer is embedded in the first insulating recovery layer can be synchronously realized, and after the second outer semiconductor layer is finally recovered, the insulation disconnection of the first and second outer semiconductor layers is also realized simultaneously, multiple operations are avoided, the manufacturing time is further shortened, the interference of impurities is reduced, and the product quality is improved.
In some embodiments of the invention, one end of the ring-shaped prefabricated outer semiconductor die is disposed within the ring-shaped groove and the other end extends out to be connected to the outer shield.
In some embodiments of the present invention, in order to make the recovered first outer semi-conducting layer directly buried in the first insulation recovery layer in the process of one-step forming, the first prefabricated insulation module can adopt a hollow step-shaped cylindrical structure, wherein the annular groove is provided at the junction of the step.
The utility model discloses a in some embodiments, interior semiconductor electric connection layer's recovery technology still includes and carries out the surface finish to the interior semiconductor electric connection layer that compound was accomplished, can prolong product life, avoids producing the bubble or remains impurity influence product quality.
The utility model discloses a some embodiments, the recovery technology of first insulation restoration layer and second insulation restoration layer still includes to compound insulating connecting layer of accomplishing carries out the surface finish technology and handles, can prolong product life, avoids producing the bubble or remains impurity influence product quality.
The utility model discloses a in some embodiments, prefabricated semiconductor die adopts and adopts the material preparation the same with cable body inner semi-conductive layer material preparation prefabricated insulating module adopts and cable body insulating layer material identical material preparation, adopts the melting that the realization that can be better with the same material of cable body to connect each layer and each layer of body to combine, prolongs product life, improves product quality.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (8)
1. A prefabricated fusion spliced cable insulation connector comprising:
the conductor connecting layer (1) is formed by connecting two sections of conductors needing to be spliced;
the inner semi-conductive connecting layer (2) is arranged on the outer surface of the conductor connecting layer (1) and is fused and combined with the inner semi-conductive layers of the cable bodies at two ends needing to be spliced or repaired;
the first insulation recovery layer (3) is arranged on the outer surface of the inner semi-conductive electric connection layer (2), and one end of the first insulation recovery layer is fused and combined with the insulation layer of the cable body at one end needing to be spliced or repaired and is crosslinked;
one end of the second insulation recovery layer (4) is fused and combined with the insulation layer of the cable body and is crosslinked, and the other end of the second insulation recovery layer is fused and combined with the first insulation recovery layer (3) and is crosslinked;
a first outer semiconducting layer (5) embedded in the first insulation recovery layer (3) at least near one end of the second insulation recovery layer (4);
a second outer semiconducting layer (6) disposed on the outer surface of said second insulation recovery layer (4) and extending to the outer surface of said first insulation recovery layer (3), said first outer semiconducting layer (5) being partially overlapping or flush with the adjacent end surfaces of said second outer semiconducting layer (6) in the axial direction, said overlapping or flush with the adjacent end surfaces being interrupted in the radial direction.
2. A pre-cast fusion splice cable insulation joint as claimed in claim 1, characterised in that the first outer semiconductive layer (5) is insulated off from the second outer semiconductive layer (6) at the location of said overlap or at the location of said flush adjacent end faces.
3. A pre-fabricated fusion spliced cable insulation splice as claimed in claim 1, wherein the inner semiconductive electric connection layer (2) is formed of a pre-fabricated semiconductive sheet mounted on the periphery of the conductor connection layer (1) and fused by heating and pressing to form an inner semiconductive layer structure identical to the inner semiconductive layers of the two sections of cable body to be spliced or repaired.
4. A pre-cast welded cable insulation joint according to claim 3, characterized in that the first insulation recovery layer (3), the second insulation recovery layer (4) and the first outer semiconducting layer (5) are formed by one-time melt-joining with pre-cast modules.
5. The pre-fabricated fused cable insulation joint of claim 4, wherein the pre-fabricated mold set comprises: the semiconductor module comprises a first prefabricated insulation module, a second prefabricated insulation module and an annular prefabricated outer semiconductor die piece, wherein an annular groove is formed in the first prefabricated insulation module along the axial direction, and the annular prefabricated outer semiconductor die piece is arranged in the annular groove.
6. A pre-cast welded cable insulation joint according to claim 1, 2 or 3, wherein the end faces of the first (5) and second (6) outer semiconducting layers are smooth circular arc surfaces.
7. A pre-manufactured welded cable insulation joint according to claim 1, 2 or 3, characterized in that the second outer semi-conducting layer (6) comprises, in order from the inside to the outside, a semi-conducting paint layer and a semi-conducting layer.
8. A pre-fabricated fusion spliced cable insulation joint as claimed in claim 1, wherein the first outer semiconductive layer (5) is made of the same material as the outer semiconductive layer of the cable body to be spliced or repaired, and the first and second insulation recovery layers (3, 4) are made of the same material as the insulation layer of the cable body to be spliced or repaired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021609466.9U CN213185464U (en) | 2020-08-05 | 2020-08-05 | Prefabricated welding type cable insulation joint |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021609466.9U CN213185464U (en) | 2020-08-05 | 2020-08-05 | Prefabricated welding type cable insulation joint |
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| CN213185464U true CN213185464U (en) | 2021-05-11 |
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| CN202021609466.9U Active CN213185464U (en) | 2020-08-05 | 2020-08-05 | Prefabricated welding type cable insulation joint |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094423A (en) * | 2021-11-05 | 2022-02-25 | 瑞邦电力科技有限公司 | Manufacturing process of straight-through joint of crosslinked cable |
-
2020
- 2020-08-05 CN CN202021609466.9U patent/CN213185464U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114094423A (en) * | 2021-11-05 | 2022-02-25 | 瑞邦电力科技有限公司 | Manufacturing process of straight-through joint of crosslinked cable |
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