CN108429223B - Prefabricated three-branch intermediate joint and assembling method thereof - Google Patents
Prefabricated three-branch intermediate joint and assembling method thereof Download PDFInfo
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- CN108429223B CN108429223B CN201810217710.8A CN201810217710A CN108429223B CN 108429223 B CN108429223 B CN 108429223B CN 201810217710 A CN201810217710 A CN 201810217710A CN 108429223 B CN108429223 B CN 108429223B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/1806—Heat shrinkable sleeves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress
- H02G15/188—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress connected to a cable shield only
Abstract
The invention relates to the technical field of three-branch connection of a crosslinked polyethylene insulated power cable, wherein a prefabricated three-branch middle joint is used for electrically connecting a main cable with two branch cables and comprises a heat shrink tube, a joint insulation main body with a central through hole, a single-hole stress control body with a single jack, a double-hole stress control body with two branch jacks, a conductor connector and a shielding case; the invention utilizes the high elastic deformation capability and the flexibility of the single-hole stress control body and the double-hole stress control body, is not only beneficial to fixing the cable, but also can improve the stability in operation, can not generate contact interface gap discharge, realizes a full shielding structure, ensures that the electric field inside the intermediate joint is uniformly distributed, simultaneously has excellent waterproof sealing performance, has simple structure of the whole product, smaller dimension specification, more convenient and rapid installation, no need of special tools, low cost, excellent ozone resistance and ultraviolet resistance, and can adapt to high altitude and high ultraviolet radiation areas.
Description
Technical Field
The invention relates to the technical field of three-branch connection of a crosslinked polyethylene insulated power cable, in particular to a prefabricated three-branch intermediate joint and an assembling method thereof.
Background
Along with the continuous expansion of an urban power system, urban planning is also changed continuously, a plurality of original power transmission lines need to be transformed, and three-branch connection is needed when the current-carrying capacity of the original power transmission lines is different from that of newly laid cables;
as shown in fig. 1, the main structure of most cable three-branch connectors in the market at present is: the main insulation of the joint main body is epoxy resin, the joint main body and the metal protective shell are molded into a whole by adopting a casting molding process, the stress cones at two sides are pressed and positioned by adopting a spring support, the tail part is grounded by using a tail pipe, and the tail part is wrapped and sealed by using a strip material; although this kind of structure can satisfy three branch cable connection, this structure is fairly complicated, and the structure size is great, no matter its manufacturing cost still installation cost is all higher, because its complicated inner structure, it is very loaded down with trivial details to make ann operating procedure, require operating personnel to have higher installation skill, this undoubtedly greatly increased the installation reliability of product, and then influence the performance of product, this product uses spring compact structure in addition, the product is in the state that compresses tightly always when running for a long time, the elasticity of spring easily reduces or loses efficacy, there is great risk.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problems that a cable three-branch joint structure in the prior art is complex, assembly difficulty is high and a spring structure is easy to lose efficacy, a prefabricated three-branch intermediate joint and an assembly method thereof are provided.
The technical scheme adopted by the invention for solving the technical problems is as follows: a prefabricated three-branch middle joint is used for electrically connecting a main cable and two branch cables and comprises a heat shrink tube, a joint insulation main body with a central through hole, a single-hole stress control body with a single jack, a double-hole stress control body with two branch jacks, a conductor connector and a shielding case;
the joint insulation main body is positioned in the heat shrinkage pipe, the single-hole stress control body, the shielding cover and the double-hole stress control body are all positioned in the joint insulation main body, the single-hole stress control body is positioned at the left end of the shielding cover, and the double-hole stress control body is positioned at the right end of the shielding cover;
the conductor connector is positioned in the shielding case, the left end of the conductor connector is provided with a main connecting hole matched with the wire core of the main cable, and the right end of the conductor connector is provided with two branch connecting holes matched with the wire cores of the branch cables;
the joint insulating main body, the single-hole stress control body and the double-hole stress control body are all made of insulating liquid silicone rubber.
This scheme simple structure, size specification is less, it is more simple and convenient to install, utilize the material to have high elastic deformation ability and very softness for the haplopore stress control body and the diplopore stress control body of insulating liquid silicon rubber, thereby can hug closely and laminate on the cable well, not only be favorable to the fixed to the cable, and can improve the stability when moving, contact interface gap discharge can not appear, and utilize the material to be insulating liquid silicon rubber's joint insulation main part haplopore stress control body, diplopore stress control body and shield cover tightly wrap up, realize full shielding structure, make the inside electric field distribution of this intermediate head even, possess splendid waterproof sealing performance simultaneously.
Furthermore, conductive silicone rubber layers are arranged in the single jack of the single-hole stress control body, the central through hole of the joint insulation main body and the two branch jacks of the double-hole stress control body, the peripheral surface of the single-hole stress control body, the peripheral surface of the shielding cover and the peripheral surface of the double-hole stress control body are in contact with the conductive silicone rubber layers in the central through hole of the joint insulation main body, and the gaps between the shielding cover and the single-hole stress control body and between the shielding cover and the double-hole stress control body are shielded by the conductive silicone rubber layers, so that the electric field inside the product is uniformly distributed.
Further, a copper mesh belt is wound on the outer peripheral surface of the joint insulation main body.
Furthermore, the left end of the single-hole stress control body protrudes outwards from the joint insulation main body, and the right end of the double-hole stress control body protrudes outwards from the right end of the joint insulation main body.
In order to improve the shielding effect, a semi-conducting layer is sprayed outside the joint insulating main body, the semi-conducting layer is made of conductive silicon rubber, and an electric field can be effectively shielded through the semi-conducting layer.
The invention also provides an assembly method of the prefabricated three-branch intermediate joint, wherein the main cable and the branch cables respectively comprise a wire core, an insulating layer positioned outside the wire core, a semi-conducting belt positioned outside the insulating layer, a metal shielding wire positioned outside the semi-conducting belt and an outer sheath positioned outside the metal shielding wire, and the assembly method comprises the following steps:
s1, stripping the main cable and the two branch cables to form a core section with a core exposed outside, an insulating section with an insulating layer exposed outside, a semi-conductive section with a semi-conductive belt exposed outside and a metal shielding wire exposed outside on the main cable and the two branch cables, wherein the core section, the insulating section and the semi-conductive section on the main cable and the two branch cables are sequentially distributed along a straight line direction;
s2, grinding the end part of one end, close to the insulating section, of the semi-conductive section by using yarn paper to form a chamfer, grinding the parts, close to the semi-conductive section, of the outer sheaths of the main cable and the two branch cables by using the yarn paper, winding a sealing adhesive tape on the parts, and then reversely folding the metal shielding wires to uniformly distribute the metal shielding wires on the periphery of the outer sheaths, and then fixing the metal shielding wires on the outer sheaths by using a PVC tape to prevent the metal shielding wires on the outer sheaths from scattering;
s3, sleeving protection bags on the outer peripheral surface of the joint insulating main body and the inner peripheral surface of the central through hole, sleeving a heat-shrinkable tube on the protection bag on the outer peripheral surface of the joint insulating main body, and then penetrating a main cable through the protection bags in the joint insulating main body;
s4; sleeving a conical installation guide head on a core section of a main cable, enabling a large end of the installation guide head to be tightly attached to the end part of an insulation section on the main cable, then smearing insulation lubricating paste outside the installation guide head, outside the insulation section of the main cable and in a single jack of a single-jack stress control body, enabling the core section of the main cable to penetrate through the single jack of the single-jack stress control body, enabling the insulation section and a semi-conductive section of the main cable to be located in the single jack, and then removing the installation guide head from the core section of the main cable;
s5: sleeving two conical installation guide heads on wire core sections of two branch cables respectively, enabling the large ends of the installation guide heads to be tightly attached to the end parts of insulation sections on the branch cables, then smearing insulation lubricating paste outside the installation guide heads, outside the insulation sections of the branch cables and in branch jacks of a double-hole stress control body, enabling the wire core sections of the two branch cables to correspondingly penetrate through the branch jacks of the double-hole stress control body respectively, enabling the insulation sections and the semi-conductive sections of the same branch cable to be located in the same branch jack, and then removing the installation guide heads from the wire core sections of the branch cables;
s6: then inserting the wire core section of the main cable into a main connecting hole of the conductor connector, pressing the wire core section of the main cable in the main connecting hole by using a screw, inserting the wire core sections of the two branch cables into two branch connecting holes of the conductor connector respectively and correspondingly, pressing the wire core sections of the branch cables in the branch connecting holes by using the screw, connecting the upper half part and the lower half part of the shielding case to enable the conductor connector to be positioned in the shielding case, winding a PVC (polyvinyl chloride) belt at the middle part of the shielding case, taking out a protection bag inside and outside the joint insulating main body, and pushing the joint insulating main body between the single-hole stress control body and the double-hole stress control body;
s7: winding a copper mesh belt outside the joint insulation main body, so that the copper mesh belt covers the peripheral surface of the whole joint insulation main body, and the adjacent two copper mesh belts are partially overlapped; then, the metal shielding wires which are reversely folded are folded back and are contacted with the copper mesh belt, and then the waterproof belt is wound outside the joint insulating main body, so that the waterproof belt covers the copper mesh belt on the outer peripheral surface of the whole joint insulating main body, and the adjacent two waterproof belts are partially overlapped;
s8: and then sleeving the heat-shrinkable tube on the joint insulating main body, and uniformly heating and shrinking to finish the installation.
The invention has the beneficial effects that: the prefabricated three-branch intermediate joint of the invention utilizes the single-hole stress control body and the double-hole stress control body which are made of insulating liquid silicon rubber to have high elastic deformation capability and very soft, thereby being well held and attached on the cable, not only being beneficial to fixing the cable, but also improving the stability during operation without generating contact interface gap discharge, and the joint insulation main body made of insulation liquid silicon rubber is utilized to tightly wrap the single-hole stress control body, the double-hole stress control body and the shielding cover, so as to realize a full shielding structure and ensure that the electric field inside the middle joint is uniformly distributed, possesses splendid waterproof sealing performance simultaneously, and whole product simple structure, size specification is less, and the installation is more convenient and fast, need not specialized tool, and is with low costs, and ozone resistance and ultraviolet resistance are good, can adapt to high altitude and high ultraviolet radiation region.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic view of a prior art cable three-drop connection;
FIG. 2 is a schematic view of a pre-fabricated three-pronged intermediate joint of the present invention;
FIG. 3 is a schematic view of a single-hole stress control body in a pre-fabricated three-branch intermediate joint according to the present invention;
FIG. 4 is a schematic view of a dual-hole stress control body in the pre-fabricated three-branch intermediate joint of the present invention;
fig. 5 is a schematic view of the joint insulation body in the prefabricated three-branch intermediate joint according to the present invention;
FIG. 6 is a schematic cross-sectional view of a main cable according to the present invention;
FIG. 7 is a schematic view of the present invention assembled with the main cable stripped;
FIG. 8 is a schematic view of a branch cable being stripped during assembly of the present invention;
FIG. 9 is a schematic view of a main cable assembly single hole stress control body of the present invention;
FIG. 10 is a schematic view of a branch cable assembly dual-hole stress control body of the present invention;
FIG. 11 is a schematic view of the assembly of main and branch cables with a conductor connector according to the present invention;
fig. 12 is a schematic view of the insulating body of the installation joint and the copper mesh tape wound thereon in the present invention.
In the figure: 1. the cable comprises a main cable, 2, branch cables, 3, a heat shrinkable tube, 4, a joint insulation main body, 4-1, a central through hole, 5, a single-hole stress control body, 5-1, a single jack, 6, a double-hole stress control body, 6-1, branch jacks, 7, a conductor connector, 8, a shielding cover, 9, a conductive silicone rubber layer, 10, a copper mesh tape, 11, a wire core, 11-1, a wire core section, 12, an insulation layer, 12-1, an insulation section, 13, a semi-conductive tape, 13-1, a semi-conductive section, 14, a metal shielding wire, 15, an outer sheath, 16, a sealing adhesive tape, 17, a protection bag, 18, a PVC tape, 19 and an installation guide head.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams illustrating the basic structure of the present invention only in a schematic manner, and thus show only the constitution related to the present invention, and directions and references (e.g., upper, lower, left, right, etc.) may be used only to help the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.
Example 1
As shown in fig. 2-5, a prefabricated three-branch intermediate joint for electrically connecting a main cable 1 and two branch cables 2 comprises a heat shrinkable tube 3, a joint insulation main body 4 having a central through hole 4-1, a single-hole stress control body 5 having a single jack 5-1, a double-hole stress control body 6 having two branch jacks 6-1, a conductor connector 7 and a shield cover 8;
the joint insulation main body 4 is positioned in the heat shrink tube 3, the single-hole stress control body 5, the shielding case 8 and the double-hole stress control body 6 are all positioned in the joint insulation main body 4, the single-hole stress control body 5 is positioned at the left end of the shielding case 8, and the double-hole stress control body 6 is positioned at the right end of the shielding case 8;
the conductor connector 7 is positioned in the shielding case 8, the left end of the conductor connector 7 is provided with a main connecting hole matched with the wire core 11 of the main cable 1, and the right end of the conductor connector 7 is provided with two branch connecting holes matched with the wire cores 11 of the branch cables 2;
the joint insulation main body 4, the single-hole stress control body 5 and the double-hole stress control body 6 are all made of insulation liquid silicon rubber.
Conductive silicone rubber layers 9 are arranged in the single jack 5-1 of the single-hole stress control body 5, the central through hole 4-1 of the joint insulation main body 4 and the two branch jacks 6-1 of the double-hole stress control body 6, the peripheral surface of the single-hole stress control body 5, the peripheral surface of the shielding cover 8 and the peripheral surface of the double-hole stress control body 6 are all in contact with the conductive silicone rubber layers 9 in the central through hole 4-1 of the joint insulation main body 4, and gaps among the shielding cover 8, the single-hole stress control body 5, the shielding cover 8 and the double-hole stress control body 6 are shielded by the conductive silicone rubber layers 9, so that electric fields in products are uniformly distributed.
The outer peripheral surface of the joint insulation main body 4 is wound with a copper mesh belt 10.
The left end of the single-hole stress control body 5 protrudes outwards from the joint insulation main body 4, the right end of the double-hole stress control body 6 protrudes outwards from the right end of the joint insulation main body 4, one part of the conductive silicone rubber layer 9 in the single-hole stress control body 5 is positioned in the joint insulation main body 4 in the axial direction, and the other part of the conductive silicone rubber layer is positioned outside the joint insulation main body 4; similarly, the conductive silicone rubber layer 9 in the dual-hole stress control body 6 is located in the joint insulating body 4 in a part and outside the joint insulating body 4 in the axial direction.
The outer spraying of joint insulating main part 4 has the semi-conducting layer, the material of semi-conducting layer is conductive silicone rubber, can effectively shield the electric field through the setting of semi-conducting layer.
The invention also provides an assembly method of the prefabricated three-branch intermediate joint, as shown in fig. 6, each of the main cable 1 and the branch cable 2 comprises a wire core 11, an insulating layer 12 positioned outside the wire core 11, a semi-conductive belt 13 positioned outside the insulating layer 12, a metal shielding wire 14 positioned outside the semi-conductive belt 13 and an outer sheath 15 positioned outside the metal shielding wire 14, and the assembly method comprises the following steps:
s1, as shown in fig. 7 and 8, stripping both the main cable 1 and the two branch cables 2 to form a core section 11-1 with the core 11 exposed outside, an insulation section 12-1 with the insulation layer 12 exposed outside, a semi-conductive section 13-1 with the semi-conductive tape 13 exposed outside, and a metal shielding wire 14 exposed outside on the main cable 1 and the two branch cables 2, wherein the core section 11-1, the insulation section 12-1, and the semi-conductive section 13-1 on the main cable 1 and the two branch cables 2 are distributed in sequence along a straight line direction;
s2, grinding one end part of the semi-conductive section 13-1 close to the insulating section 12-1 to form a chamfer by using a piece of yarn paper, enabling the two to be in smooth transition, then grinding the parts, close to the semi-conductive section 13-1, of the outer sheaths 15 of the main cable 1 and the two branch cables 2 by using the yarn paper, winding a sealing adhesive tape 16 on the parts, and then reversely folding the metal shielding wires 14 to enable the metal shielding wires 14 to be uniformly distributed on the periphery of the outer sheath 15, and then fixing the metal shielding wires 14 on the outer sheath 15 by using a PVC tape 18 to prevent the metal shielding wires 14 on the outer sheath 15 from being scattered, wherein the winding sealing adhesive tape 16 can form a shaft shoulder structure on the outer sheath 15, so that the corner radius is increased when the metal shielding wires 14 are reversely folded, and the metal shielding wires 14 are prevented from being broken;
s3, sleeving protection bags 17 on the outer peripheral surface of the joint insulating main body 4 and the inner peripheral surface of the central through hole 4-1, sleeving a heat-shrinkable tube 3 outside the protection bag 17 on the outer peripheral surface of the joint insulating main body 4, and then penetrating the main cable 1 through the protection bag 17 in the joint insulating main body 4;
s4; as shown in fig. 9, the tapered mounting lead 19 is fitted over the core segment 11-1 of the main cable 1, and the large end of the installation guide head 19 is tightly attached to the end of the insulating section 12-1 on the main cable 1, then, the outside of the installation guide head 19, the outside of the insulation section 12-1 of the main cable 1 and the inside of the single jack 5-1 of the single-hole stress control body 5 are coated with insulation lubricating paste, then the core segment 11-1 of the main cable 1 is passed through the single insertion hole 5-1 of the single hole stress control body 5, the insulation segment 12-1, the semi-conduction segment 13-1 of the main cable 1 and the sealing tape 16 wound on the outer sheath 15 are all located in the single insertion hole 5-1, and then the installation guide 19 is removed from the core segment 11-1 of the main cable 1, wherein, the arrangement of the installation guide head 19 and the smearing of the insulating lubricating grease can facilitate the installation of the single-hole stress control body 5;
s5: as shown in fig. 10, two conical installation guide heads 19 are respectively sleeved on the core segments 11-1 of the two branch cables 2, and the large end of the mounting guide 19 is brought into close contact with the end of the insulating section 12-1 of the branch cable 2, then, the outside of the installation guide head 19, the outside of the insulation section 12-1 of the branch cable 2 and the inside of the branch jack 6-1 of the double-hole stress control body 6 are coated with insulation lubricating paste, then, the core sections 11-1 of the two branch cables 2 respectively and correspondingly penetrate through the branch jacks 6-1 of the double-hole stress control body 6, the insulation section 12-1, the semi-conduction section 13-1 and the sealing adhesive tape 16 wound on the outer sheath 15 of the same branch cable 2 are all positioned in the same branch jack 6-1, and then the installation guide head 19 is removed from the core section 11-1 of the branch cable 2, and in the same way, the installation of the double-hole stress control body 6 can be facilitated by the arrangement of the installation guide head 19 and the application of insulating lubricating paste;
s6: as shown in fig. 11 and 12, the core segment 11-1 of the main cable 1 is inserted into the main connection hole of the conductor connector 7, the core segment 11-1 of the main cable 1 is pressed in the main connection hole by a screw, the core segments 11-1 of the two branch cables 2 are inserted into the two branch connection holes of the conductor connector 7, the core segments 11-1 of the branch cables 2 are pressed in the branch connection holes by a screw, the upper half part and the lower half part of the shield cover 8 are connected, the conductor connector 7 is positioned in the shield cover 8, the PVC tape 18 is wound around the middle part of the shield cover 8, so that the shield cover 8 is fixed, the protection bags 17 inside and outside the joint insulating body 4 are taken out, and the joint insulating body 4 is pushed between the single-hole stress controller 5 and the double-hole stress controller 6;
s7: winding a copper mesh belt 10 outside the joint insulation main body 4, so that the copper mesh belt 10 covers the outer peripheral surface of the whole joint insulation main body 4, and the adjacent two copper mesh belts 10 are partially overlapped; then the metal shielding wires 14 which are reversely folded are folded back and contacted with the copper net belts 10, and waterproof belts are wound outside the joint insulating main body 4, so that the waterproof belts cover the copper net belts 10 on the outer peripheral surface of the whole joint insulating main body 4, and the adjacent two waterproof belts are partially overlapped, wherein the arrangement of the copper net belts 10 can improve the shielding effect, and the partial overlapping between the adjacent two copper net belts 10 can reduce the aperture, so that the shielding effect can be further enhanced;
s8: and then sleeving the heat shrinkable tube 3 on the joint insulation main body 4, and uniformly heating and shrinking to finish the installation.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that numerous changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (1)
1. The utility model provides an assembly method of three branch intermediate head of prefabricated formula, main cable (1) and branch cable (2) all include sinle silk (11), be located sinle silk (11) outside insulating layer (12), be located insulating layer (12) outside semi-conductive area (13), be located semi-conductive area (13) outside metallic shield silk (14) and be located oversheath (15) outside metallic shield silk (14), its characterized in that: the assembling method comprises the following steps:
s1, stripping both the main cable (1) and the two branch cables (2) to form a core section (11-1) with a core (11) exposed outside, an insulation section (12-1) with an insulation layer (12) exposed outside, a semi-conductive section (13-1) with a semi-conductive belt (13) exposed outside and a metal shielding wire (14) exposed outside on the main cable (1) and the two branch cables (2), wherein the core section (11-1), the insulation section (12-1) and the semi-conductive section (13-1) on the main cable (1) and the two branch cables (2) are sequentially distributed along a straight line direction;
s2, polishing one end part of the semi-conductive section (13-1) close to the insulating section (12-1) by using a piece of yarn paper to form a chamfer, polishing the parts of the outer sheaths (15) of the main cable (1) and the two branch cables (2) close to the semi-conductive section (13-1) by using the yarn paper, winding a sealing adhesive tape (16) on the parts, reversely folding the metal shielding wires (14) to uniformly distribute the metal shielding wires (14) on the periphery of the outer sheaths (15), and fixing the metal shielding wires (14) on the outer sheaths (15) by using a PVC (polyvinyl chloride) tape (18);
s3, sleeving a protection bag (17) on the outer peripheral surface of the joint insulation main body (4) and the inner peripheral surface of the central through hole (4-1), sleeving a heat shrinkable tube (3) outside the protection bag (17) on the outer peripheral surface of the joint insulation main body (4), and then enabling the main cable (1) to penetrate through the protection bag (17) in the joint insulation main body (4);
s4; sleeving a conical installation guide head (19) on a wire core section (11-1) of a main cable (1), enabling a large end of the installation guide head (19) to be tightly attached to the end part of an insulating section (12-1) on the main cable (1), then smearing insulating lubricating paste outside the installation guide head (19), outside the insulating section (12-1) of the main cable (1) and inside a single jack (5-1) of a single-hole stress control body (5), enabling the wire core section (11-1) of the main cable (1) to penetrate through the single jack (5-1) of the single-hole stress control body (5), enabling the insulating section (12-1) and a semi-conductive section (13-1) of the main cable (1) to be located in the single jack (5-1), and then removing the installation guide head (19) from the wire core section (11-1) of the main cable (1);
s5: two conical installation guide heads (19) are respectively sleeved on the wire core sections (11-1) of the two branch cables (2), and the big end of the installation guide head (19) is tightly attached to the end part of the insulation section (12-1) on the branch cable (2), then, coating insulating lubricating paste outside the installation guide head (19), outside the insulating section (12-1) of the branch cable (2) and inside the branch jack (6-1) of the double-hole stress control body (6), then, the core sections (11-1) of the two branch cables (2) respectively correspondingly penetrate through the branch jacks (6-1) of the double-hole stress control body (6), the insulating sections (12-1) and the semi-conductive sections (13-1) of the same branch cable (2) are located in the same branch jack (6-1), and then the installation guide head (19) is removed from the core sections (11-1) of the branch cables (2);
s6: then the core section (11-1) of the main cable (1) is inserted into the main connecting hole of the conductor connector (7), and the core section (11-1) of the main cable (1) is pressed in the main connecting hole by using a screw, simultaneously, the core segments (11-1) of the two branch cables (2) are respectively inserted into the two branch connecting holes of the conductor connector (7) correspondingly, and the core segment (11-1) of the branch cable (2) is pressed in the branch connecting hole by using a screw, then the upper half part and the lower half part of the shielding cover (8) are connected, the conductor connector (7) is positioned in the shielding cover (8), a PVC belt (18) is wound at the middle part of the shielding cover (8), then taking out the protection bags (17) inside and outside the joint insulating main body (4), and pushing the joint insulating main body (4) between the single-hole stress control body (5) and the double-hole stress control body (6);
s7: winding a copper mesh belt (10) outside the joint insulation main body (4), so that the copper mesh belt (10) covers the peripheral surface of the whole joint insulation main body (4), and the adjacent two copper mesh belts (10) are partially overlapped; then the metal shielding wires (14) which are reversely folded are folded back and contacted with the copper net belts (10), and waterproof belts are wound outside the joint insulating main body (4) so that the waterproof belts cover the copper net belts (10) on the outer peripheral surface of the whole joint insulating main body (4), and the adjacent waterproof belts are partially overlapped;
s8: and then sleeving the heat-shrinkable tube (3) on the joint insulating main body (4), and uniformly heating and shrinking to finish the installation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810217710.8A CN108429223B (en) | 2018-03-16 | 2018-03-16 | Prefabricated three-branch intermediate joint and assembling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810217710.8A CN108429223B (en) | 2018-03-16 | 2018-03-16 | Prefabricated three-branch intermediate joint and assembling method thereof |
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| CN108429223A CN108429223A (en) | 2018-08-21 |
| CN108429223B true CN108429223B (en) | 2020-05-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2687914Y (en) * | 2004-02-20 | 2005-03-23 | 长沙电缆附件有限公司 | H-shape branch joint for power cable branching |
| CN200979979Y (en) * | 2006-12-05 | 2007-11-21 | 广东长园电缆附件有限公司 | L-shaped extendable branch joint applied to a middle-voltage cable branch system |
| CN201303244Y (en) * | 2008-11-07 | 2009-09-02 | 长沙长缆电缆附件有限公司 | Dry type Y-shaped branch connector for high-voltage power cable |
| RS55809B1 (en) * | 2010-09-21 | 2017-08-31 | Huber+Suhner Ag | Environmentally sealed cable breakout assemblies |
| CN204858509U (en) * | 2015-07-20 | 2015-12-09 | 泉州市泉港鑫林机械科技有限公司 | Cable branch joint casing |
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Address after: 213000 No. 128 Dongfang East Road, Changzhou City, Jiangsu Province Patentee after: Xinchengrui (Changzhou) Power Technology Co., Ltd Address before: 213025 No. 128 Dongfang East Road, Changzhou City, Jiangsu Province Patentee before: Changzhou ankaite power device Co., Ltd |
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| CP03 | Change of name, title or address |