CN110364902B - Medium-voltage fireproof cable connection method and medium-voltage fireproof cable - Google Patents
Medium-voltage fireproof cable connection method and medium-voltage fireproof cable Download PDFInfo
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- CN110364902B CN110364902B CN201910738628.4A CN201910738628A CN110364902B CN 110364902 B CN110364902 B CN 110364902B CN 201910738628 A CN201910738628 A CN 201910738628A CN 110364902 B CN110364902 B CN 110364902B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/005—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for making dustproof, splashproof, drip-proof, waterproof, or flameproof connection, coupling, or casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
Abstract
The invention provides a medium-voltage fireproof cable connection method and a medium-voltage fireproof cable, and relates to the technical field of cables. The method comprises the following steps: stripping off the protective layers of a first cable and a second cable to be connected respectively so that the first cable exposes a plurality of leads and the second cable exposes a plurality of leads; carrying out staggered welding on each conducting wire of the first cable and one conducting wire of the second cable to obtain an intermediate joint part of the first cable and the second cable; shielding and insulating each conducting wire in the middle joint part to obtain a plurality of sub-cables; filling gaps between adjacent sub-cables in the plurality of sub-cables and then coating the gaps to obtain a cable core of the middle joint part; and welding the gap of the protective layer stripped from the middle and intermediate head parts to obtain the connected cable. Through shielding and insulating treatment to the wire, obtain the sub-cable, fill and the cladding processing obtains the sinle silk to the sub-cable, to the gap welding of inoxidizing coating, realize medium voltage fireproof cable's connection, effectively guarantee the fire behavior of cable junction.
Description
Technical Field
The invention relates to the technical field of cables, in particular to a medium-voltage fireproof cable connection method and a medium-voltage fireproof cable.
Background
The medium-voltage fireproof cable has good fire resistance, is widely applied to high-rise buildings and environments with higher fireproof level, and is more and more used along with the enhancement of safety consciousness of people.
In practical applications, when a medium-voltage cable is used for supplying power, the medium-voltage fireproof cable with a short length needs to be connected because the length of a power supply line is long.
Disclosure of Invention
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method for connecting a medium-voltage fireproof cable and a medium-voltage fireproof cable, which can connect a medium-voltage fireproof cable having a short length.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a medium-voltage fireproof cable connection method, where the method includes:
stripping off shielding layers of a first cable and a second cable to be connected respectively so that the first cable exposes a plurality of leads and the second cable exposes a plurality of leads;
carrying out staggered welding on each conducting wire of the first cable and one conducting wire of the second cable to obtain an intermediate joint part of the first cable and the second cable;
shielding and insulating each conducting wire in the middle joint part to obtain a plurality of sub-cables;
filling gaps between adjacent sub-cables in the plurality of sub-cables and then coating the gaps to obtain a cable core of the middle joint part;
and welding the gap of the protective layer stripped from the middle joint part to obtain the connected cable.
Further, the welding each conducting wire of the first cable and one conducting wire of the second cable in a staggered manner to obtain the intermediate joint part of the first cable and the second cable includes:
and carrying out silver brazing welding on each conducting wire of the first cable and one conducting wire of the second cable in a layer-by-layer staggered mode to obtain an intermediate joint part of the first cable and the second cable.
Further, the shielding and insulating of each conducting wire in the middle joint part to obtain a plurality of sub-cables includes:
respectively wrapping each wire in the middle joint part by using a semi-conductive belt to obtain a semi-conductive wire shielding layer of the wire in the middle joint part;
and according to a preset temperature, placing the conducting wire of the semi-conductive conducting wire shielding layer in a mould with an insulating material, treating for a preset time, and then removing the mould to obtain a plurality of sub-cables, wherein the semi-conductive conducting wire shielding layer and the insulating layer are sequentially arranged outside the conducting wire of each sub-cable.
Further, after the removing the mold, the method further comprises:
spraying semi-conductive paint on the surface of the insulating layer;
wrapping the insulating layer sprayed with the semi-conductive paint by using a semi-conductive belt so as to form a semi-conductive insulating shielding layer on the insulating layer;
winding the semi-conductive insulating shielding layer by adopting a metal belt with a preset size so as to form a metal shielding layer outside the semi-conductive insulating shielding layer; the semi-conductive insulating shielding layer and the metal shielding layer are sequentially arranged outside the insulating layer in the sub-cable.
Further, the filling and then coating the gaps between the adjacent sub-cables in the plurality of sub-cables to obtain the cable core of the middle joint part includes:
according to the glass fiber filling rope, after gaps between adjacent sub-cables in the sub-cables are filled, a glass fiber tape is adopted for wrapping to form a first fire-resistant wrapping layer, and a cable core of the middle joint part is obtained; the core comprises: a plurality of the sub-cables are wrapped by the first fire-resistant wrapping layer, and a filler is arranged in a gap between every two adjacent sub-cables.
Further, the stripped-off protective layer comprises: an oxygen barrier layer; the pair the gap of inoxidizing coating that middle joint portion peeled off welds, obtains the cable after the connection, includes:
the stripped oxygen-isolating layer is tightly buckled on the surface of the first fireproof wrapping layer, and a gap of the oxygen-isolating layer is welded;
and heating the welding position of the oxygen isolation layer for a preset time.
Further, the stripped protective layer further comprises: a refractory layer; the method further comprises the following steps:
tightly buckling the peeled fire-resistant layer on the surface of the oxygen-isolating layer, and welding the gap of the fire-resistant layer;
heating the welding position of the fire-resistant layer for a preset time;
and wrapping the glass fiber belt on the surface of the refractory layer to form a second refractory wrapping.
Further, the stripped protective layer further comprises: a protective sleeve; the method further comprises the following steps:
the stripped protective sleeve is tightly buckled outside the second fire-resistant wrapping bag, and a gap of the protective sleeve is welded;
and heating the welding position of the protective sleeve for a preset time to obtain the connected cable.
Further, the protective sheath that will peel off is fastened in the outside of the fire-resistant package of second, includes:
and coating a steel belt on the surface of the second fire-resistant lapping package, and tightly buckling the stripped protective sleeve on the surface of the steel belt.
In a second aspect, an embodiment of the present invention further provides a medium-voltage fireproof cable, where multiple cables are connected in sequence; the connecting joints of adjacent cables of the plurality of cables are connected by the method of the first aspect.
The invention has the beneficial effects that: the embodiment of the invention provides a medium-voltage fireproof cable connection method and a medium-voltage fireproof cable, wherein protective layers of a first cable and a second cable to be connected are respectively stripped, so that a plurality of leads are exposed out of the first cable, and a plurality of leads are exposed out of the second cable; carrying out staggered welding on each conducting wire of the first cable and one conducting wire of the second cable to obtain an intermediate joint part of the first cable and the second cable; shielding and insulating each conducting wire in the middle joint part to obtain a plurality of sub-cables; filling gaps between adjacent sub-cables in the plurality of sub-cables and then coating the gaps to obtain a cable core of the middle joint part; and welding the gap of the protective layer stripped from the middle and intermediate head parts to obtain the connected cable. Through shielding and insulating treatment to each wire, obtain a plurality of sub-cables, carry out the cladding after filling through the clearance to adjacent sub-cable, obtain the sinle silk of middle joint portion, weld the gap of the inoxidizing coating of peeling off, obtain the cable after the connection, realize middling pressure fireproof cable's connection to can effectively guarantee the fire behavior of cable junction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a medium-voltage fireproof cable according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a connected cable according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
In the embodiment of the present invention, the mechanical device that responds may be controlled by the terminal to perform the steps of the medium voltage fireproof cable connection method provided in the embodiment of the present invention, and in the case of construction environment restrictions, the operator may operate a corresponding device such as a manipulator or perform operations by a robot.
Fig. 1 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention; as shown in fig. 1, the method may include:
s101, respectively stripping protective layers of a first cable and a second cable to be connected to enable the first cable to expose a plurality of leads and the second cable to expose a plurality of leads.
The lengths of the plurality of exposed wires of the first cable and the lengths of the plurality of exposed wires of the second cable may be the same.
In the embodiment of the invention, for the first cable and the second cable to be connected, the protective layers of the first cable and the second cable can be respectively stripped according to the preset length. In addition, when the preset length is 50 cm, the length of the plurality of exposed leads of the first cable is 50 cm, and the length of the plurality of exposed leads of the second cable is also 50 cm.
Of course, the preset length may be determined according to an empirical value, or may be determined according to actual requirements, which is not specifically limited in the embodiment of the present invention.
S102, conducting staggered welding on each conducting wire of the first cable and one conducting wire of the second cable to obtain an intermediate joint part of the first cable and the second cable.
The intermediate joint part may include a portion where each of the conductive wires of the first cable and one of the conductive wires of the second cable are welded, the first cable exposing the plurality of conductive wires, and the second cable exposing the plurality of conductive wires.
In a possible embodiment, each conducting wire of the first cable and one conducting wire of the second cable can be subjected to offset welding by using a welding material with a smaller resistance value through a welding technology of argon arc welding to obtain the intermediate joint part.
It should be noted that the material of the lead may be the second type of soft copper conductor, and may also be a lead made of other materials, which is not limited in the embodiment of the present invention.
S103, conducting shielding and insulating treatment on all conducting wires in the intermediate head part to obtain a plurality of sub-cables.
After one conducting wire is subjected to shielding and insulating treatment, one sub-cable can be obtained, and the number of the conducting wires is the same as that of the sub-cables.
In one possible embodiment, for each wire of the intermediate joint part, the semiconductive wire shield layer, the insulating layer, the semiconductive insulating shield layer and the metallic shield layer may be restored in sequence outside the wire, thereby achieving the shielding and insulating process for the intermediate joint part.
And S104, filling gaps between adjacent sub-cables in the plurality of sub-cables and then coating the gaps to obtain a wire core of the middle joint part.
The material for filling the gap between adjacent sub-cables may be a filling material included in the protection layer stripped in S101, and may also be a filling material that is rearranged, which is not specifically limited in the embodiment of the present invention.
In a possible implementation manner, the filling material may be a glass fiber filling rope, gaps between adjacent sub-cables are filled with a fire-resistant filling material, the shape of the filled sub-cables may be cylindrical, the outer diameter of the filled sub-cables is smaller than or equal to the outer diameter formed by the plurality of cables, and then the filled sub-cables are coated with fire-resistant wrapping tapes to form a first fire-resistant wrapping layer, so as to obtain the core of the middle joint portion.
And S105, welding the gap of the protective layer stripped from the middle and middle head parts to obtain the connected cable.
In the embodiment of the invention, the stripped protective layer can be sequentially restored outside the wire core, namely, the gap of the stripped protective layer is welded, and the oxygen-insulating layer, the fire-resistant layer, the second fire-resistant wrapping, the steel belt and the protective sleeve can be sequentially restored outside the wire core.
It should be noted that, oxygen barrier, flame retardant coating and protective sheath can adopt the welded mode to weld, and the fire-resistant package of second can adopt the mode of cladding to resume with the steel band, for example, the fire-resistant package of second can the cladding in the flame retardant coating surface, and the steel band can the cladding in the fire-resistant surface of wrapping the layer of second.
In summary, embodiments of the present invention provide a method for connecting a medium-voltage fireproof cable, in which protective layers of a first cable and a second cable to be connected are respectively stripped, so that a plurality of wires are exposed from the first cable, and a plurality of wires are exposed from the second cable; carrying out staggered welding on each conducting wire of the first cable and one conducting wire of the second cable to obtain an intermediate joint part of the first cable and the second cable; shielding and insulating each conducting wire in the middle joint part to obtain a plurality of sub-cables; filling gaps between adjacent sub-cables in the plurality of sub-cables and then coating the gaps to obtain a cable core of the middle joint part; and welding the gap of the protective layer stripped from the middle and intermediate head parts to obtain the connected cable. Through shielding and insulating treatment to each wire, obtain a plurality of sub-cables, carry out the cladding after filling through the clearance to adjacent sub-cable, obtain the sinle silk of middle joint portion, weld the gap of the inoxidizing coating of peeling off, obtain the cable after the connection, realize the connection to middling pressure fireproof cable to can effectively guarantee the fire behavior of cable junction.
Optionally, in step S102, performing staggered welding on each conducting wire of the first cable and one conducting wire of the second cable to obtain an intermediate joint portion of the first cable and the second cable, may include:
and carrying out silver brazing welding on each conducting wire of the first cable and one conducting wire of the second cable in a layer-by-layer staggered mode to obtain the middle joint part of the first cable and the second cable.
Wherein, if the wire is an aluminum core stranded conductor, argon arc welding can be adopted.
In a possible implementation mode, smudges and burrs of each conductor are removed before welding, each conducting wire of the first cable and one conducting wire of the second cable are aligned and staggered and unfolded layer by layer, silver brazing welding is adopted for welding, the conducting wires are guaranteed not to be loose and have burrs during welding, after welding is completed, the surfaces of the conducting wires are cleaned by cable cleaning paper, the outer diameters of the conducting wires at the welding positions are measured, and the outer diameters of the conducting wires at the welding positions are guaranteed to be the same as the outer diameter of the conducting wire body.
It should be noted that, the silver brazing filler metal is used for welding, so that the resistance of the lead at the welding position can be ensured not to be larger than the resistance of the lead body, and the breaking force at the welding position can be ensured not to be smaller than ninety percent of the breaking force of the lead body by adopting a layer-by-layer dislocation mode.
In the embodiment of the invention, the welding is carried out in a layer-by-layer dislocation mode, so that the breaking force of the middle joint part of the connected cable can be increased, the connected cable is not easy to break, and the tensile strength of the joint part is improved.
Fig. 2 is a schematic flow chart of a method for connecting a medium-voltage fireproof cable according to an embodiment of the present invention, as shown in fig. 2, in S103, performing shielding and insulating treatment on each conducting wire in the intermediate header to obtain a plurality of sub-cables, which may include:
and S201, respectively wrapping each wire in the middle joint part by using a semi-conductive belt to obtain a semi-conductive wire shielding layer of the wire in the middle joint part.
Wherein the semiconductive tape can be an imported crosslinkable semiconductive tape of the same grade as the cable.
In some embodiments, the surfaces of the wires are cleaned, the wires are wrapped with a fifty percent stretch cross-linkable semiconductive tape having a fifty percent overlap ratio to obtain semiconductive wire shields for the wires in the intermediate joint, and the surfaces of the semiconductive wire shields are cleaned with cable cleaning paper after wrapping.
In addition, after the semi-conductive wire shielding layer is formed, the wire with the semi-conductive wire shielding layer can be tightly pressed by a metal mold, so that the semi-conductive wire shielding layer is compact in structure and smooth and round in surface layer, and a gap between the semi-conductive wire shielding layer and the wire can be reduced.
S202, placing the conducting wires of the shielding layer of the semi-conducting wire in a mold with an insulating material according to a preset temperature, treating for a preset time, and then removing the mold to obtain a plurality of sub-cables.
The wire of each sub-cable is sequentially provided with a semi-conductive wire shielding layer and an insulating layer, wherein the insulating material can be a cross-linked polyethylene insulating material, and the mold can be a cross-linked mold.
In a possible implementation mode, cross-linking temperature and time in a cross-linking mold are calculated in a simulation mode through NCC intelligent cross-linking calculation software, in the cross-linking mold, according to preset temperature and time, a wire of a semi-conductive wire shielding layer and a cross-linked polyethylene insulating material are cross-linked, so that the cross-linked polyethylene insulating material and the semi-conductive wire shielding layer are tightly combined, after the mold is cooled to the room temperature, the mold is removed, and a plurality of sub-cables with insulating layers are obtained.
The insulating layers of the plurality of sub-cables are polished to avoid the defects of projections and/or depressions on the surface of the insulating layers. After the insulating layer is polished, the surface of the insulating layer can be cleaned by cable cleaning paper, and in addition, the insulation thickness of the joint is not more than ten percent of the insulation thickness of the cable body.
Fig. 3 is a schematic structural diagram of a cross section of a medium voltage fireproof cable according to an embodiment of the present invention, as shown in fig. 3, the medium voltage fireproof cable includes: the lead 10, the semiconductive conductor shielding layer 11 and the insulating layer 12 are sequentially arranged outside the lead 10, and the semiconductive conductor shielding layer 11 and the insulating layer 12 are sequentially arranged outside the lead 10.
Fig. 4 is a schematic flow chart of a method for connecting a medium-voltage fireproof cable according to an embodiment of the present invention, as shown in fig. 4, in S202, after the mold is removed, the method may further include:
s301, spraying semi-conductive paint on the surface of the insulating layer.
Wherein, the surface of the insulating layer can be cleaned by absolute ethyl alcohol to remove dust on the surface of the insulating layer, then the surface of the insulating layer is evenly sprayed with semi-conductive paint, and after the spraying is finished, the semi-conductive paint is naturally dried.
And S302, wrapping the insulating layer sprayed with the semi-conductive paint by using a semi-conductive tape to form a semi-conductive insulating shielding layer on the insulating layer.
It should be noted that, the insulating layer coated with the semi-conductive paint can be wrapped by a semi-conductive teflon tape and pressed flat to reduce the existence of impurities and air gaps, so that the electrical performance of the cable at the joint part is closer to that of the cable body.
And S303, wrapping the semi-conductive insulating shielding layer by adopting a metal belt with a preset size so as to form a metal shielding layer outside the semi-conductive insulating shielding layer.
The middle insulating layer of the sub-cable is sequentially provided with a semi-conductive insulating shielding layer and a metal shielding layer.
In the embodiment of the invention, the copper strips with the same thickness and width as those in the metal layer of the cable body can be adopted for wrapping the semi-conductive insulating shielding layer, and the joints of the wrapping can be welded by tin soldering, so that the metal shielding layer is formed outside the semi-conductive insulating shielding layer.
As shown in fig. 3, the sub-cable of the medium voltage fireproof cable includes: the lead 10 comprises a lead 10, a semiconductive lead shielding layer 11, an insulating layer 12, a semiconductive insulating shielding layer 13 and a metal shielding layer 14, wherein the semiconductive lead shielding layer 11, the insulating layer 12, the semiconductive insulating shielding layer 13 and the metal shielding layer 14 are arranged outside the lead 10 in sequence.
In the embodiment of the invention, the conductive wire shielding layer, the insulating layer, the semi-conductive insulating shielding layer and the metal shielding layer outside the wire are recovered, so that the reliability of the cable connecting part in signal transmission can be improved.
Optionally, in S104, the method may include: according to the glass fiber filling rope, after the gaps between the adjacent sub-cables in the plurality of sub-cables are filled, a glass fiber tape is adopted for wrapping, a first fire-resistant wrapping layer is formed, and a cable core of the middle joint part is obtained.
Wherein, the glass fiber tape can be alkali-free glass fiber tape, and the sinle silk includes: the gap of the adjacent sub-cables is provided with a filler.
It should be noted that when the glass fiber filling rope is used to fill the gap between adjacent sub-cables in the plurality of sub-cables, it should be ensured that the filling is dense, and the filled sub-cables are round, so as to enhance the fire resistance of the subsequent process.
As shown in fig. 3, fig. 3 further includes: glass fiber filling rope 15, first fire-resistant covering 16 around, glass fiber filling rope 15 is used for filling the clearance of sublay, and first fire-resistant covering 16 winds the sublay after the package is filled.
Fig. 5 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention, and as shown in fig. 5, optionally, the stripped protective layer includes: the oxygen barrier layer, in S105, welding a gap of the protective layer peeled off from the intermediate joint to obtain a connected cable, may include:
s401, tightly buckling the stripped oxygen isolation layer on the surface of the first fire-resistant wrapping layer, and welding a gap of the oxygen isolation layer.
Wherein, the oxygen-insulating layer material can be a low-smoke halogen-free oxygen-insulating layer sheath material with the oxygen index not less than 47.
In a possible implementation mode, the stripped oxygen-isolating layer is tightly buckled on the surface of the first fireproof wrapping layer, the material which is the same as the material of the oxygen-isolating layer is adopted for welding, the material of the oxygen-isolating layer is easy to decompose at high temperature, the temperature of heating equipment can be adjusted to 300-400 ℃, and the heating time can be controlled to be 3-10 seconds for the surface of each oxygen-isolating layer needing to be welded so as to prevent the high-temperature decomposition of the material of the oxygen-isolating layer.
In addition, after welding is finished, the surface of the oxygen isolating layer can be subjected to flattening treatment.
S402, heating the welding position of the oxygen isolation layer for a preset time.
In some embodiments, a layer of high-temperature-resistant wrapping tape can be wrapped on the surface of the oxygen-isolating layer, a layer of copper strip is wound on the surface of the high-temperature-resistant wrapping tape, and liquefied gas flame is adopted to bake the surface of the copper strip, so that the welding position of the oxygen-isolating layer is uniformly heated, stress is eliminated, and the joint is ensured not to crack.
Fig. 6 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention, as shown in fig. 6, optionally, the stripped protective layer includes: a refractory layer, the method further comprising:
s501, tightly buckling the peeled fireproof layer on the surface of the oxygen-isolating layer, and welding the gap of the fireproof layer.
Wherein, the material of the fire-resistant layer can be ceramic fire-resistant polyolefin sheath material.
In a possible embodiment, the peeled fireproof layer is tightly buckled on the surface of the oxygen-isolating layer, the fireproof layer is welded by adopting the material with the same material as the fireproof layer, the ceramic fireproof layer material is melted and welded at high temperature, the temperature of the heating equipment can be adjusted to 300-400 ℃, and the heating time can be controlled between 3-10 seconds for each fireproof layer surface needing to be welded so as to prevent the ceramic oxygen-isolating layer material from being decomposed at high temperature.
In addition, after welding is completed, the surface of the fire-resistant layer can be subjected to leveling treatment.
S502, heating the welding position of the fire-resistant layer for a preset time;
in some embodiments, a layer of high-temperature-resistant wrapping tape can be wrapped on the surface of the fire-resistant layer, a layer of copper strip can be wrapped on the surface of the high-temperature-resistant wrapping tape, and liquefied gas flame is adopted to bake the surface of the copper strip, so that the welding position of the fire-resistant layer is uniformly heated, stress is eliminated, and the welding position is ensured not to crack.
S503, wrapping the glass fiber tape on the surface of the fire-resistant layer to form a second fire-resistant wrapping.
It should be noted that a layer of glass fiber wrapping tape can be overlapped and wrapped on the surface of the ceramic fire-resistant layer, and the joint of the wrapping tape is fixed by adopting a glass fiber self-adhesive tape to form a second fire-resistant wrapping.
Fig. 7 is a schematic flow chart of a connection method of a medium-voltage fireproof cable according to an embodiment of the present invention, and as shown in fig. 7, optionally, the stripped protective layer further includes: the method further comprises:
s601, tightly buckling the stripped protective sleeve outside the second fire-resistant wrapping bag, and welding a gap of the protective sleeve;
wherein, the protective sheath can be low smoke and zero halogen oversheath.
In a possible implementation mode, the stripped protective sleeve is fastened on the surface of the oxygen isolation layer, the material which is the same as the material of the fire-resistant layer is adopted for welding, the temperature of the heating equipment can be adjusted to 400-500 ℃, the heating time of the protective sleeve surface which needs to be welded at each position can be controlled to be 3-10 seconds, so that the protective sleeve is prevented from being decomposed at high temperature, and the outer diameter of the protective sleeve is measured after welding is completed, so that whether the outer diameter is the same as the preset outer diameter or not is confirmed.
In addition, after welding is finished, the surface of the protective sleeve can be subjected to flattening treatment.
S602, heating the welding position of the protective sleeve for a preset time to obtain the connected cable.
In some embodiments, the surface of the protective sleeve can be wrapped with a layer of high-temperature-resistant wrapping tape, a layer of copper strip is wound on the surface of the high-temperature-resistant wrapping tape, and liquefied gas flame is adopted to bake the surface of the copper strip, so that the welding position of the protective sleeve is uniformly heated, stress is eliminated, and the welding position is prevented from cracking.
In the embodiment of the invention, the oxygen isolation layer, the fire-resistant layer, the second fire-resistant wrapping and the protective sleeve are recovered, so that the fire resistance of the middle joint part of the cable is improved, the connected cable is not easy to burn, and the safety is higher.
As shown in fig. 3, the medium-voltage fireproof cable provided in the embodiment of the present invention further includes: separate oxygen layer 17, flame retardant coating 18, the fire-resistant package 19 and protective sheath 20 of lapping of second, first fire-resistant package 16 has in proper order outward and separates oxygen layer 17, flame retardant coating 18, the fire-resistant package 19 and protective sheath 20 of lapping of second.
Optionally, a steel belt is wrapped on the surface of the second fire-resistant wrapping, and the peeled protective sleeve is fastened on the surface of the steel belt.
In the embodiment of the invention, the surface of the second fire-resistant wrapping can be coated by adopting a stripped steel belt in a manner that the wrapping clearance is not more than fifty percent, the joint can be cut into a round opening for welding, and after the welding is finished, the welding part needs to be polished.
The steel belt is coated on the surface of the second fire-resistant wrapping bag, so that the strength of the middle joint part of the cable can be improved, and the connected cable is not easy to damage.
According to the medium-voltage fireproof cable connection method provided by the embodiment of the invention, the connected cable has the characteristics of no halogen, low smoke, flame retardance, fire resistance and the like, the maximum allowable working temperature of the connected middle joint part is 90 ℃, and the maximum allowable short-circuit temperature is 250 ℃.
In addition, sampling and testing the intermediate joint part of the connected medium-voltage fireproof cable according to the technical specification of a wire and cable quality supervision and inspection center, namely annex B of TICW 8-2012, wherein in the whole testing process, the rated voltage U is applied to the connected cable under the conditions that the fire supply time is 180 minutes and the flame temperature is 950-1000 DEG C0Can ensure no breakdown, and within one hour after the test is finished, the voltage of 3.5U is applied to the connected cable0The connected cable can last for 15 minutes without breaking down.
In the embodiment of the invention, a waterproof experiment is carried out on the middle joint part of the connected medium-voltage fireproof cable, the middle joint part of the connected medium-voltage fireproof cable is soaked in water for 72 hours, the protective sleeve, the second fire-resistant wrapping, the fire-resistant layer, the oxygen isolation layer, the first fire-resistant wrapping layer, the glass fiber filling rope, the metal shielding layer and the semi-conductive insulating shielding layer of the middle joint part are sequentially peeled off, the surface of the insulating layer obtained after peeling is observed, and the surface of the insulating layer is still dry, so that the medium-voltage fireproof cable connected by the method provided by the embodiment of the invention has good waterproof performance.
Fig. 8 is a schematic structural diagram of a connected cable according to an embodiment of the present invention, and as shown in fig. 8, an embodiment of the present invention further provides a medium-voltage fireproof cable, including: a plurality of cables connected in sequence; the connection joints of adjacent cables of the plurality of cables are connected using any of the methods described above with reference to fig. 1-2 and 4-7.
As shown in fig. 8, a first cable 21, a second cable 22 and a connection joint 23 may be included, and the first cable 21 and the second cable 22 are connected by using the method described above in any one of fig. 1 to 2 and 4 to 7.
In the embodiments provided in the present invention, it should be understood that the disclosed method can be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Claims (8)
1. A method of connecting medium voltage fire resistant cables, the method comprising:
respectively stripping protective layers of a first cable and a second cable to be connected to enable the first cable to expose a plurality of leads and the second cable to expose a plurality of leads;
carrying out staggered welding on each conducting wire of the first cable and one conducting wire of the second cable to obtain an intermediate joint part of the first cable and the second cable;
shielding and insulating each conducting wire in the middle joint part to obtain a plurality of sub-cables;
filling gaps between adjacent sub-cables in the plurality of sub-cables and then coating the gaps to obtain a cable core of the middle joint part;
welding the gap of the protective layer stripped from the middle joint part to obtain a connected cable;
the process of filling and then coating the gaps between adjacent sub-cables in the plurality of sub-cables to obtain the cable core of the middle joint part comprises the following steps:
according to the glass fiber filling rope, after gaps between adjacent sub-cables in the sub-cables are filled, a glass fiber tape is adopted for wrapping to form a first fire-resistant wrapping layer, and a cable core of the middle joint part is obtained; the core comprises: a plurality of the sub-cables covered by the first fire-resistant wrapping layer, wherein a filler is arranged in a gap between every two adjacent sub-cables;
the stripped protective layer comprises: an oxygen barrier layer; the pair the gap of inoxidizing coating that middle joint portion peeled off welds, obtains the cable after the connection, includes:
the stripped oxygen-isolating layer is tightly buckled on the surface of the first fireproof wrapping layer, and a gap of the oxygen-isolating layer is welded;
and heating the welding position of the oxygen isolation layer for a preset time.
2. The method of claim 1, wherein said off-set welding each conductor of said first cable to one conductor of said second cable to provide an intermediate joint portion of said first cable and said second cable comprises:
and carrying out silver brazing welding on each conducting wire of the first cable and one conducting wire of the second cable in a layer-by-layer staggered mode to obtain an intermediate joint part of the first cable and the second cable.
3. The method of claim 1, wherein said shielding and insulating each conductor in the intermediate joint portion to obtain a plurality of sub-cables comprises:
respectively wrapping each wire in the middle joint part by using a semi-conductive belt to obtain a semi-conductive wire shielding layer of the wire in the middle joint part;
and according to a preset temperature, placing the conducting wire of the semi-conductive conducting wire shielding layer in a mould with an insulating material, treating for a preset time, and then removing the mould to obtain a plurality of sub-cables, wherein the semi-conductive conducting wire shielding layer and the insulating layer are sequentially arranged outside the conducting wire of each sub-cable.
4. The method of claim 3, wherein after said removing said mold, said method further comprises:
spraying semi-conductive paint on the surface of the insulating layer;
wrapping the insulating layer sprayed with the semi-conductive paint by using a semi-conductive belt so as to form a semi-conductive insulating shielding layer on the insulating layer;
winding the semi-conductive insulating shielding layer by adopting a metal belt with a preset size so as to form a metal shielding layer outside the semi-conductive insulating shielding layer; the semi-conductive insulating shielding layer and the metal shielding layer are sequentially arranged outside the insulating layer in the sub-cable.
5. The method of claim 1, wherein stripping the protective layer further comprises: a refractory layer; the method further comprises the following steps:
tightly buckling the peeled fire-resistant layer on the surface of the oxygen-isolating layer, and welding the gap of the fire-resistant layer;
heating the welding position of the fire-resistant layer for a preset time;
and wrapping the glass fiber belt on the surface of the refractory layer to form a second refractory wrapping.
6. The method of claim 5, wherein stripping the protective layer further comprises: a protective sleeve; the method further comprises the following steps:
the stripped protective sleeve is tightly buckled outside the second fire-resistant wrapping bag, and a gap of the protective sleeve is welded;
and heating the welding position of the protective sleeve for a preset time to obtain the connected cable.
7. The method of claim 6 wherein said securing said stripped protective jacketing to the exterior of said second fire resistant wrapping comprises:
and coating a steel belt on the surface of the second fire-resistant lapping package, and tightly buckling the stripped protective sleeve on the surface of the steel belt.
8. A medium voltage fire-resistant cable, comprising: a plurality of cables connected in sequence; the joint of adjacent cables of the plurality of cables is obtained by connecting the cables by the method of any one of claims 1 to 7.
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| CN201910738628.4A CN110364902B (en) | 2019-08-12 | 2019-08-12 | Medium-voltage fireproof cable connection method and medium-voltage fireproof cable |
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| DE626546C (en) * | 1936-02-27 | Carl Cremer | Process for the production of conductor connections without thickening of the cross section in cables | |
| DE2110129A1 (en) * | 1971-02-26 | 1972-08-31 | Siemens Ag | Process for the production of soldered connections for thin insulated electrical conductors |
| JP4897952B2 (en) * | 2006-06-02 | 2012-03-14 | 株式会社ビスキャス | DC coaxial cable connection for power |
| CN100467254C (en) * | 2006-07-26 | 2009-03-11 | 夏云杰 | Making technique for welding middle joints of 66KV to 500KV crosslinked polyethylene insulated cables |
| CN202616428U (en) * | 2012-06-04 | 2012-12-19 | 上海上缆藤仓电缆有限公司 | Cable soft joint |
| CN202771839U (en) * | 2012-07-05 | 2013-03-06 | 安徽江淮电缆集团有限公司 | Low-smoke halogen-free flame-retardant fire-resistant high-voltage power cable |
| CN203858896U (en) * | 2014-02-28 | 2014-10-01 | 特变电工股份有限公司 | heat insulation fire resistance cable |
| CN203850015U (en) * | 2014-03-27 | 2014-09-24 | 青岛汉缆股份有限公司 | Superhigh-voltage and ultrahigh-voltage crosslinked voltage flexible joint |
| CN204792125U (en) * | 2015-07-15 | 2015-11-18 | 江苏中超电缆股份有限公司 | Fire -retardant fire -resistant midium voltage cable |
| CN205016296U (en) * | 2015-09-17 | 2016-02-03 | 远程电缆股份有限公司 | Fire -resistant high temperature resistance medium voltage power cable |
| CN106374397A (en) * | 2016-11-09 | 2017-02-01 | 重庆联邦中北电缆股份有限公司 | Preparation method of crosslinked polyethylene cable connector |
| CN107123956A (en) * | 2017-05-15 | 2017-09-01 | 深圳科创新源新材料股份有限公司 | A kind of intermediate joint of electric cable welding and renovation technique |
| CN208507233U (en) * | 2018-07-12 | 2019-02-15 | 江苏珠影特种电缆有限公司 | A kind of pull-up cable of highly resistance |
| CN109861047A (en) * | 2018-11-20 | 2019-06-07 | 嘉兴市新缆电缆有限公司 | A method of extending cable length |
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