CN110011232B - Butting method of 10kV three-core cable - Google Patents
Butting method of 10kV three-core cable Download PDFInfo
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- CN110011232B CN110011232B CN201910243903.5A CN201910243903A CN110011232B CN 110011232 B CN110011232 B CN 110011232B CN 201910243903 A CN201910243903 A CN 201910243903A CN 110011232 B CN110011232 B CN 110011232B
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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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
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Abstract
The invention relates to a butt joint method of 10kV three-core cables, the joint of two cables after butt joint according to the butt joint method of the invention meets the requirements, can realize the permanent butt joint of the cable, in the temporary reconstruction and extension project of the cable run, remove the joint of the existing cable, reuse the original cable terminal and adopt the butt joint method of the 10kV three-core cable of the invention can realize the permanent butt joint of two cables, do not need to saw the terminal; when the original operation mode needs to be recovered, the operation mode can be recovered after the connectors of the two cables are detached, the loss caused by cutting and stripping the cables is avoided, and the reconstruction cost is saved.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a butt joint method of a 10kV three-core cable.
Background
When the cable run rebuilds temporarily, need demolish equipment such as vary voltage cabinet to make intermediate head after pulling down the original terminal of cable, rethread intermediate head butt joint temporary line, if need resume original operational mode, then need surely shell the final intermediate head and dock once more after the terminal is makeed again, the cable surely shells and can cause the loss of cable length, can lead to the surplus of cable not enough even, has improved the cost of rebuilding.
Disclosure of Invention
The invention mainly aims to provide a cable butt joint method convenient for butt joint and disassembly, which adopts the technical scheme that:
a butt joint method of a 10kV three-core cable comprises the following steps:
s1, preparing two cables, wherein the ends to be butted of the two cables are respectively provided with a terminal, the terminal of each cable respectively comprises a shielding layer ground wire, an armor layer ground wire, an A-phase wire core, a B-phase wire core and a C-phase wire core, the A-phase wire core and the C-phase wire core are positioned on two sides of the B-phase wire core, and wire noses are respectively arranged at the tail ends of the shielding layer ground wire, the armor layer ground wire, the A-phase wire core, the B-phase wire core and the C-phase wire core corresponding to each cable;
s2, on the basis of the step S1, inserting three bolts into nose inner holes of two wire noses corresponding to the phase A wire core, the phase B wire core and the phase C wire core respectively, and enabling the two wire noses corresponding to the three bolts to be mutually pressed through nuts respectively;
s3, on the basis of the step S2, respectively covering a voltage-sharing cover on the periphery of the connection position of each phase core, and respectively winding a semi-conducting belt on each voltage-sharing cover;
s4, winding polytetrafluoroethylene tapes between the two main insulation edges of the same-phase wire core on the basis of the step S3;
s5, on the basis of the step S4, respectively winding waterproof insulating tapes between the fracture parts of the three finger sleeves of the same-phase wire core for insulating treatment;
s6, on the basis of the step S5, respectively winding waterproof adhesive tapes between the fracture parts of the three finger sleeves of the same-phase wire core for waterproof treatment;
s7, winding non-adhesive plastic tapes between the fracture parts of the three finger sleeves of the two cables on the basis of the step S6;
s8, on the basis of the step S7, inserting a bolt into the nose inner holes of the two shielding layer ground wires, and enabling the wire noses of the two shielding layer ground wires to be mutually pressed on the bolt through a nut; inserting a bolt into the nose inner holes of the two armor layer ground wires, and pressing the wire noses of the two armor layer ground wires on the bolt through a nut;
s9, on the basis of the step S8, respectively winding waterproof insulating tapes between the ends, far away from each other, of the two shielding layer ground wires and between the ends, far away from each other, of the two armor layer ground wires for insulating treatment;
s10, winding a non-adhesive plastic tape between the ends, far away from each other, of the ground wires of the shielding layers of the two cables on the basis of the step S9;
s11, on the basis of the step S10, winding a waterproof adhesive tape between the ends, far away from each other, of the three finger sleeves for waterproof treatment;
and S12, winding an armor layer between the ends, far away from each other, of the three finger sleeves on the basis of the step S11.
Preferably, after the step S1 is completed, the corners of each wire nose are ground with sandpaper to be smooth.
Preferably, each pressure equalizing cover comprises two conical covers, and conical bottom surfaces of the two conical covers corresponding to each pressure equalizing cover are attached to each other.
Preferably, each conical cover comprises two arc-shaped groove bodies, and the two arc-shaped groove bodies are sleeved on the corresponding wire cores respectively and are spliced to form the conical cover.
Preferably, silicone grease layers are respectively coated between the three voltage-sharing covers and the corresponding wire cores.
Preferably, the number of layers wound by the polytetrafluoroethylene tape is not less than 30, and the thickness of the polytetrafluoroethylene tape is not less than 4.5 mm.
Preferably, in step S3, each layer of the semiconductive tape is wound, and a silicone layer is respectively coated on the semiconductive tape; in step S4, each teflon tape is wound one layer, and a silicone layer is applied to each teflon tape.
Preferably, in step S2, the two phase cores a are symmetrically distributed at two sides of the joint of the two phase cores, and the included angle between the two phase cores is 120 °, the two phase cores B are symmetrically distributed at two sides of the joint of the two phase cores B, and the included angle between the two phase cores B is 120 °, the two phase cores C are symmetrically distributed at two sides of the joint of the two phase cores C, and the included angle between the two phase cores C is 120 °.
Preferably, accomplish behind step S5, prepare an insulator spindle, accomplish behind step S5, prepare an insulator spindle, be equipped with three circular arc groove on the insulator spindle one end terminal surface, and three the both ends in circular arc groove extend to respectively the outer fringe of insulator spindle, and three the central angle in circular arc groove is 120, will the vertical junction of placing at three-phase sinle silk of insulator spindle, the junction of A looks sinle silk the junction of B looks sinle silk with the junction of C looks sinle silk holds respectively threely in the circular arc inslot.
Preferably, the method further comprises the step S13: and coating a waterproof protective layer on the outer side of the armor layer for waterproof treatment.
The 10kV three-core cable butt joint method is used for dismantling the joint of the existing cable in the temporary reconstruction and extension project of a cable line, and the cable butt jointed by the 10kV three-core cable butt joint method by utilizing the original cable terminal meets the requirements, can realize the permanent butt joint of the cable and does not need to saw off the terminal; the original operation mode needs to be recovered, the operation mode can be recovered after the joint of the two cables is dismantled, the loss caused by cutting and stripping the cables is avoided, and the reconstruction cost is saved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of the embodiment of the present invention after completing step S1;
FIG. 2 is a schematic diagram of the embodiment of the present invention after completing step S2;
FIG. 3 is a schematic diagram of the embodiment of the present invention after completing step S4;
FIG. 4 is a schematic diagram of the embodiment of the present invention after completing step S5;
FIG. 5 is a schematic view of the installation of the insulation rod according to the embodiment of the present invention;
FIG. 6 is a schematic diagram of the embodiment of the present invention after completing step S7;
FIG. 7 is a diagram illustrating the method after completing step S8;
fig. 8 is a schematic diagram of the embodiment of the invention after step S11 is completed.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The principles and features of the present invention are described below in conjunction with the accompanying fig. 1-8, which are provided as examples to illustrate the invention and not to limit the scope of the invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 8, an embodiment of the present invention is provided, in which a method for butting a 10kV three-core cable described in this embodiment includes the following steps:
step S1, preparing two cables 100, wherein the ends to be butted of the two cables 100 are respectively provided with a terminal, the terminal of each cable 100 respectively comprises a shielding layer ground wire 101, an armor layer ground wire 102, an A-phase wire core, a B-phase wire core and a C-phase wire core, the A-phase wire core and the C-phase wire core are positioned on two sides of the B-phase wire core, and the tail ends of the shielding layer ground wire 101, the armor layer ground wire 102, the A-phase wire core, the B-phase wire core and the C-phase wire core corresponding to each cable 100 are respectively provided with a wire nose;
s2, on the basis of the step S1, inserting three bolts into nose inner holes of two wire noses corresponding to the phase A wire core, the phase B wire core and the phase C wire core respectively, and enabling the two wire noses corresponding to the three bolts to be mutually pressed through nuts respectively; the two phase line cores A are symmetrically distributed on two sides of the joint of the two phase line cores A, the included angle between the two phase line cores A is 120 degrees, the two phase line cores B are symmetrically distributed on two sides of the joint of the two phase line cores B, the included angle between the two phase line cores B is 120 degrees, the two phase line cores C are symmetrically distributed on two sides of the joint of the two phase line cores C, and the included angle between the two phase line cores C is 120 degrees;
s3, on the basis of the step S2, respectively covering a voltage-sharing cover on the periphery of the connection position of each phase core, and respectively winding a semi-conducting belt on each voltage-sharing cover; each semi-conducting belt is wound to and fro from one end of the corresponding voltage-sharing cover to the other end in a semi-overlapping mode;
s4, winding polytetrafluoroethylene tapes between two main insulating edges of the same-phase wire cores respectively on the basis of the step S3, wherein each polytetrafluoroethylene tape is wound back and forth from one wire core to the other same-phase wire core in a semi-overlapping mode;
s5, on the basis of the step S4, respectively winding waterproof insulating tapes between the fracture parts of the three finger sleeves of the same-phase wire cores for insulating treatment, wherein each waterproof insulating tape is wound back and forth in a half-overlapping mode from one wire core to the other wire core of the same phase so as to increase the waterproof performance of the three-phase wire cores, and the periphery of each waterproof insulating tape is uniformly coated with silicone grease so as to fill the gaps of the waterproof insulating tapes and ensure the waterproof performance of the three-phase wire cores;
s6, winding a non-adhesive waterproof adhesive tape between the fracture parts of the three finger sleeves of the two wire cores in the same phase respectively to perform waterproof treatment on the two wire cores in the step S5;
s7, on the basis of the step S6, respectively winding non-adhesive plastic tapes between the fracture parts of the two cable three-finger sleeves and fixing the plastic tapes by using PVC adhesive tapes;
step S8, on the basis of the step S7, inserting bolts into the nose inner holes of the two shielding layer ground wires 101, and enabling the wire noses of the two shielding layer ground wires 101 to be mutually pressed on the bolts through nuts; inserting a bolt into the nose inner holes of the two armor layer ground wires 102, and pressing the wire noses of the two armor layer ground wires 102 on the bolt through a nut;
step S9, on the basis of the step S8, respectively winding waterproof insulating tapes between the ends, far away from each other, of the two shielding layer ground wires 101 and between the ends, far away from each other, of the two armor layer ground wires 102 for insulation treatment; the waterproof insulating tape corresponding to the shielding layer ground wire 101 is wound back and forth in a half-overlapping manner from one of the shielding layer ground wires 101 to the other of the shielding layer ground wires 101, and the waterproof insulating tape corresponding to the armor layer ground wire 102 is wound back and forth in a half-overlapping manner from one of the armor layer ground wires 102 to the other of the armor layer ground wires 102;
step S10, winding a non-adhesive plastic tape between the ends, away from each other, of the ground wires of the two cables 100 on the basis of the step S9;
s11, on the basis of the step S10, winding a waterproof adhesive tape between the ends, far away from each other, of the three finger sleeves for waterproof treatment; the waterproof adhesive tape is wound back and forth by a cable ground wire at one end far away from the other cable in a semi-overlapping mode;
and S12, on the basis of the step S11, an armor layer is wound between the ends, far away from each other, of the three finger sleeves, and therefore the butt joint of the two cables 100 is completed.
According to the butt joint method of the 10kV three-core cable, the same-phase wire cores are connected through the bolts and the nuts, the semi-conducting belt, the polytetrafluoroethylene belt, the waterproof insulating belt, the waterproof adhesive tape and the non-adhesive plastic tape are sequentially wound at the joint of the 10kV three-core cable terminal, the waterproof insulating belt, the non-adhesive plastic tape, the waterproof adhesive tape and the armor layer are wound on the peripheries of the ground wire and the three-phase wire cores, the electrical performance of the joint of the two cables 100 is guaranteed to be larger than the insulating strength of the cable 100 body, meanwhile, the joint of the two cables 100 is guaranteed to have good waterproofness, and the armor layer is provided for the joint of the two cables 100 terminal in the step S9 to serve as protection of mechanical force, so that the joint of the cable 100 terminal meets the requirements.
The two cables 100 butted by the butting method of the 10kV three-core cable meet the requirements, in the temporary reconstruction and extension project of the cable line, the terminal head of the original cable 100 is detached, the two cables 100 can be butted by utilizing the original cable terminal head and the butting method of the 10kV three-core cable, the permanent butting of the cables 100 can be realized, the terminal head does not need to be sawed off, the joint made by cutting can be recovered when the original operation mode needs to be recovered, the loss caused by cutting and stripping the cable 100 again is avoided, and the cost is saved.
Preferably, after step S1 is completed, the corners of each wire nose are finely ground with sandpaper so that the corners of the wire nose are rounded;
when the wire noses are stained with stains and are not wiped clean, the stains on the wire noses can be removed through sanding with abrasive paper, and therefore the fact that the electrical conductivity of the wire noses is affected by the stains on the wire noses is avoided.
The abrasive paper is high-resistance aluminum oxide abrasive paper, so that the performance of the wire nose is guaranteed.
Preferably, after step S2 is completed, the tip and corner of each bolt and nut are polished with sand paper to avoid electric field stress concentration causing discharge at the wire nose, bolt and nut tip.
Preferably, every the pressure equalizing cover includes two toper covers respectively, every two that the pressure equalizing cover corresponds the awl bottom surface of toper cover is laminated each other, two that B phase line core corresponds the axis of toper cover is on same straight line, two that A phase line core corresponds the axis of toper cover is close to two contained angle between one side of B phase line core is 120, two that C phase line core corresponds the axis of toper cover is close to two contained angle between one side of B phase line core is 120, just two that A phase line core corresponds the toper cover with two that C phase line core corresponds toper cover symmetric distribution is in the both sides of B phase line core.
The voltage-sharing cover is made of metal materials and covers the periphery of the wire cores, so that the potential of each voltage-sharing cover is consistent with that of the corresponding wire core, and air suspension discharge is prevented.
Preferably, every the bell jar includes two arc cell bodies respectively, two the arc cell body overlaps respectively and establishes correspondingly on the sinle silk and the amalgamation becomes the bell jar to by the winding the semi-conductive area makes every two that the bell jar corresponds the arc cell body amalgamation.
And then, uniform silicone grease layers are coated between the three voltage-sharing covers and the three-phase wire cores, and the silicone grease fills gaps so as to prevent partial discharge and air suspension discharge of the gaps.
Preferably, in step S4, the thickness of the ptfe tape is not less than 4.5mm, and the number of layers wound by the ptfe tape is not less than 30, so as to strengthen the electrical stress at the terminal of each phase of the electrical core, and enhance the electrical resistance insulation strength of each phase of the electrical core per unit volume, and ensure that the overall electrical insulation strength at the joint is greater than 1.5 times the insulation strength of the cable 100 body, so as to eliminate the axial and radial electric field stress caused by unequal and uneven electrical connections.
In step S4, a teflon tape is wound between the two cores in phase at a position 50mm away from the main insulation thereof on the side where the cores are away from each other.
Preferably, in step S3, each layer of the semiconductive tape is wound, and a silicone layer is respectively coated on the semiconductive tape; in step S4, each teflon tape is wound one layer, and a silicone layer is applied to the teflon tape.
The silicone grease can fill the gap between the semi-conducting tape and the polytetrafluoroethylene tape respectively to prevent partial discharge and air suspension discharge of the gap.
Preferably, after step S4 is completed, the two cores in the same phase are tapered with their tapered bottoms attached to each other; after step S5, the two cores of the same phase are tapered with their tapered bottoms attached to each other; after step S6 is accomplished, two sinle silks of homophase are the toper that the awl bottom was laminated each other, and two contained angle between the A phase line core is 120, two contained angle between the C phase line core is 120, two the B phase sinle silk is on same straight line.
Each conical polytetrafluoroethylene tape respectively corresponds to the wire core to form a stress cone, so that the electric field distribution of the insulation shielding layer is improved, the insulation damage is reduced, and the safe operation of a cable line is ensured.
Preferably, after step S6 is accomplished, prepare an insulator spindle 1, accomplish step S5 after, prepare an insulator spindle 1, be equipped with three circular arc groove on 1 terminal surface of insulator spindle, and three the both ends in circular arc groove extend to respectively the outer fringe of insulator spindle 1, and three the central angle of circular arc groove is 120, will the vertical junction of placing at the three-phase sinle silk of insulator spindle 1, the junction of A looks sinle silk the junction of B looks sinle silk with the junction of C looks sinle silk holds respectively threely in the circular arc inslot.
The A-phase wire core, the B-phase wire core and the C-phase wire core are respectively accommodated in the three arc grooves and fixed, so that the connection part of the terminal of the cable 100 cannot be deformed under the action of external force, the included angle and the position among the A-phase wire core, the B-phase wire core and the C-phase wire core are ensured, the insulation damage among phases is prevented, and the vector sum of alternating current of the three-phase wire cores is ensured to be zero; meanwhile, the insulating rod 1 increases the electrical insulation strength among the three-phase wire cores.
The insulating rod 1 is made of a wood material, and the shape of the insulating rod is matched with the shape of a gap between the A-phase wire core and the B-phase wire core and the shape of a gap between the B-phase wire core and the C-phase wire core.
After step S6 is completed, two cores of the same phase are in a conical shape with conical bottoms attached to each other, a conical gap is formed between the core of the phase A and the core of the phase B, and a conical gap is formed between the core of the phase B and the core of the phase C.
After the insulating rod 1 is placed, a high-voltage insulating tape is wound at the break of the three finger sleeves of the two cables 100 so as to enhance the electrical insulation strength and ensure the structural stability of the insulating rod 1.
Preferably, after step S8 is completed, the tip and the corner of each bolt and nut on the shielding layer ground wire 101 and the armor layer ground wire 102 are polished with sand paper to make the tip and the corner of each bolt and nut smooth, so as to avoid the electric field stress concentration from causing the discharge of the wire nose, the bolt and the nut tip.
Preferably, in steps S2 and S8, the length of the bolt is selected according to the nose aperture of each wire nose and the thickness of the hole, so that both ends of each bolt protrude 1-2 threads corresponding to the inner hole of the wire nose, and the nut corresponding to each bolt presses the two wire noses, thereby ensuring that the two wire noses on each bolt are pressed against each other and ensuring that large current can smoothly pass through.
Preferably, in step S10, a non-adhesive waterproof tape is wound between ends of the two cables, which are away from each other, and 30mm away from the ends, respectively, to restore the waterproof layer of the ground wires of the cable 100.
In step S10, the waterproof insulating tape enables two cables to have four layers of dense waterproof layers, and has excellent waterproof performance.
Preferably, the method further comprises the step S13: and coating a waterproof protective layer on the outer side of the armor layer for waterproof treatment so as to further ensure the waterproof performance of the intermediate joint.
Carrying out an alternating current withstand voltage test on the two 10kV three-core cables butted by the butting method for 30min under 46kV, wherein flashover and breakdown are avoided; the two butted 10kV three-core cables are subjected to a direct-current withstand voltage test for 30min under 65kV, the leakage current is less than or equal to 1 muA, and flashover and breakdown are avoided; the two butted 10kV three-core cables are 1.73U0Then, carrying out a partial discharge test, wherein the partial discharge quantity is 1-2 pC; and performing impact test under the alternating current of 105kV without flashover, breakdown and discharge, and after the test is finished, stripping and cutting the cable connector to observe that no discharge phenomenon is found at the cable terminal.
According to the test results, the electrical performance of the joint of the terminal ends of the two cables butted by the butting method is far higher than the test standard of the power cable.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. A10 kV three-core cable butt joint method is characterized by comprising the following steps:
the method comprises the following steps that S1, two cables (100) are prepared, a terminal is arranged at one end to be butted of each cable (100), the terminal of each cable (100) comprises a shielding layer ground wire (101), an armor layer ground wire (102), an A-phase wire core, a B-phase wire core and a C-phase wire core, the A-phase wire core and the C-phase wire core are located on two sides of the B-phase wire core, and wire noses are respectively arranged at the tail ends of the shielding layer ground wire (101), the armor layer ground wire (102), the A-phase wire core, the B-phase wire core and the C-phase wire core corresponding to each cable (100);
s2, on the basis of the step S1, inserting three bolts into nose inner holes of two wire noses corresponding to the phase A wire core, the phase B wire core and the phase C wire core respectively, and enabling the two wire noses corresponding to the three bolts to be mutually pressed through nuts respectively;
s3, on the basis of the step S2, respectively covering a voltage-sharing cover on the periphery of the connection position of each phase core, and respectively winding a semi-conducting belt on each voltage-sharing cover;
s4, winding polytetrafluoroethylene tapes between the two main insulation edges of the same-phase wire core on the basis of the step S3;
s5, on the basis of the step S4, respectively winding waterproof insulating tapes between the fracture parts of the three finger sleeves of the same-phase wire core for insulating treatment;
s6, on the basis of the step S5, respectively winding waterproof adhesive tapes between the fracture parts of the three finger sleeves of the same-phase wire core for waterproof treatment;
s7, winding non-adhesive plastic tapes between the fracture parts of the two cable three-finger sleeves on the basis of the step S6;
s8, on the basis of the step S7, inserting bolts into nose inner holes of the two shielding layer ground wires (101), and enabling the wire noses of the two shielding layer ground wires (101) to be mutually pressed on the bolts through nuts; inserting bolts into the nose inner holes of the two armor layer ground wires (102), and pressing the wire noses of the two armor layer ground wires (102) on the bolts through nuts;
s9, on the basis of the step S8, respectively winding waterproof insulating tapes between the ends, away from each other, of the two shielding layer ground wires (101) and between the ends, away from each other, of the two armor layer ground wires (102) for insulation treatment;
s10, winding a non-adhesive plastic tape between the ends, far away from each other, of the ground wires (101) of the two shielding layers of the two cables on the basis of the step S9;
s11, on the basis of the step S10, winding a waterproof adhesive tape between the ends, far away from each other, of the three finger sleeves for waterproof treatment;
and S12, winding an armor layer between the ends, far away from each other, of the three finger sleeves on the basis of the step S11.
2. The method for butting 10kV three-core cables according to claim 1, wherein after step S1 is completed, corners of each wire nose are ground with sandpaper to be smooth.
3. The method for butting 10kV three-core cables according to claim 1, wherein each voltage-sharing cover comprises two conical covers, and conical bottom surfaces of the two conical covers corresponding to each voltage-sharing cover are attached to each other.
4. The butt joint method of the 10kV three-core cable according to claim 3, wherein each conical cover comprises two arc-shaped groove bodies, and the two arc-shaped groove bodies are sleeved on the corresponding cable cores respectively and are spliced to form the conical cover.
5. A butt joint method of a 10kV three-core cable according to claim 4, wherein a silicone layer is respectively coated between three voltage-sharing covers and corresponding wire cores.
6. The butt joint method of the 10kV three-core cable according to claim 1, wherein the number of layers wound by the polytetrafluoroethylene tape is not less than 30, and the thickness of the polytetrafluoroethylene tape is not less than 4.5 mm.
7. The method for jointing 10kV three-core cables according to claim 1, wherein in step S3, each layer of the semiconductive tape is wound, and a silicone layer is coated on the semiconductive tape; in step S4, each teflon tape is wound one layer, and a silicone layer is applied to the teflon tape.
8. A method for splicing a 10kV three-core cable according to any one of claims 1 to 7, wherein in step S2, the two A phase cores are symmetrically distributed at the joint of the two A phase cores and the angle between the two A phase cores is 120 degrees, the two B phase cores are symmetrically distributed at the joint of the two B phase cores and the angle between the two B phase cores is 120 degrees, and the two C phase cores are symmetrically distributed at the joint of the two C phase cores and the angle between the two C phase cores is 120 degrees.
9. The 10kV three-core cable butt joint method according to claim 8, wherein after the step S5 is completed, an insulating rod (1) is prepared, three arc grooves are formed in one end face of the insulating rod (1), two ends of each arc groove respectively extend to the outer edge of the insulating rod (1), central angles of the three arc grooves are 120 degrees, the insulating rod (1) is vertically placed at joints of three-phase cable cores, and the joints of the A-phase cable cores, the joints of the B-phase cable cores and the joints of the C-phase cable cores are respectively accommodated in the three arc grooves.
10. The method for butting 10kV three-core cables, according to claim 1, further comprising the step S13: and coating a waterproof protective layer on the outer side of the armor layer for waterproof treatment.
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| CN101252266B (en) * | 2008-04-14 | 2010-10-27 | 吉福合成电气（北京）有限公司 | Mounting process of three-core cable shrink terminal |
| JP5664976B2 (en) * | 2011-06-20 | 2015-02-04 | タツタ電線株式会社 | Cable connection structure |
| CN102810837B (en) * | 2012-03-16 | 2015-02-18 | 远东电缆有限公司 | Intermediate splicing closure and splicing method for optical fiber composite power cable |
| CN203118882U (en) * | 2013-02-27 | 2013-08-07 | 宁夏电力公司固原供电局 | Assembly electrically connected with molded case circuit breaker |
| CN203180478U (en) * | 2013-03-20 | 2013-09-04 | 国家电网公司 | Cable wrapping type joint |
| CN205681090U (en) * | 2016-06-16 | 2016-11-09 | 北京首都机场动力能源有限公司 | A kind of multicore cable shrinkage full casting type transition joint |
| CN109286083A (en) * | 2018-09-28 | 2019-01-29 | 乐清市华仪电缆附件有限公司 | A kind of three-core cable welded joint and its mounting process |
-
2019
- 2019-03-28 CN CN201910243903.5A patent/CN110011232B/en active Active
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| Publication number | Publication date |
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| CN110011232A (en) | 2019-07-12 |
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