CN111697405B - Cold connection method for grounding lead of intermediate joint of high-voltage cable - Google Patents
Cold connection method for grounding lead of intermediate joint of high-voltage cable Download PDFInfo
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- CN111697405B CN111697405B CN202010445016.9A CN202010445016A CN111697405B CN 111697405 B CN111697405 B CN 111697405B CN 202010445016 A CN202010445016 A CN 202010445016A CN 111697405 B CN111697405 B CN 111697405B
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- voltage cable
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Images
Classifications
-
- 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
-
- 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
-
- 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
- H01R43/033—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for wrapping or unwrapping wire connections
-
- 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
- H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
- H01R43/048—Crimping apparatus or processes
Abstract
The invention provides a cold connection method for a grounding lead of a middle joint of a high-voltage cable, which is characterized in that the middle joint is used for connecting the outer surface of an aluminum sheath of the high-voltage cable and the grounding lead; one end of the middle joint, which is connected with the outer surface of the aluminum sheath, is a net end woven by metal wires with a conductive corrosion-resistant coating; the anti-overflow cable joint is characterized in that one end of the middle joint, which is connected with the grounding lead, is a pipe end, the pipe end is used for inserting the grounding lead and fixing the grounding lead and the middle joint in a compression joint mode, and a sealing part used for being clamped on an anti-overflow baffle of a cable joint waterproof box is arranged between the net end of the middle joint and the pipe end. The method reduces the implementation process requirement of constructors, and the sealing part clamped on the anti-overflow baffle of the cable joint waterproof box is arranged between the net end and the pipe end of the intermediate joint, so that a gap is prevented from being formed between the resin and the metal wires of the stranded grounding leads at the anti-overflow baffle during resin infusion, and the fault hidden trouble caused by water inflow is avoided.
Description
Technical Field
The invention belongs to the technical field of high-voltage cable operation, and particularly relates to a cold connection method for a grounding lead of a middle joint of a high-voltage cable.
Background
In the process of laying the high-voltage cable, the installation of the cable grounding system is a key link for stable operation of the high-voltage cable. In the prior art, a corrugated pipe aluminum sheath of a high-voltage cable and a copper wire grounding wire are connected in a lead sealing manner by using a lead-lined method in the installation of a grounding system of the high-voltage cable, so that the firmness, reliability and stable electrical performance of a connecting point of the grounding system of the high-voltage cable are ensured.
The defects of the prior art are as follows: the manually implemented lead enameling method has the disadvantages of high technical difficulty, high requirement on environment and high requirement on the technical level of constructors, when the constructors are inexperienced, the lead enameling process is uneven, moisture is easily accumulated in the cavity when the cavity appears, corrosion resistance and insulation are influenced, when copper and aluminum are in direct contact, a copper-aluminum resistor is formed, and electrochemical corrosion is caused by matching with the moisture to form a primary battery, so that the stable operation of the buried high-voltage cable is seriously influenced.
Disclosure of Invention
The invention aims to provide a high-voltage cable grounding system connection method which is high in construction safety, stable in electrochemical structure, low in process requirement and convenient to implement, reduces the implementation process requirement of constructors, and is easy to operate.
The technical scheme provided by the invention is a cold connection method for a grounding lead of a middle joint of a high-voltage cable, wherein the middle joint is used for connecting the outer surface of an aluminum sheath of the high-voltage cable and the grounding lead; one end of the middle joint, which is connected with the outer surface of the aluminum sheath, is a net end woven by metal wires with a conductive corrosion-resistant coating; the anti-overflow cable joint is characterized in that one end of the middle joint, which is connected with the grounding lead, is a pipe end, the pipe end is used for inserting the grounding lead and fixing the grounding lead and the middle joint in a compression joint mode, and a sealing part used for being clamped on an anti-overflow baffle of a cable joint waterproof box is arranged between the net end of the middle joint and the pipe end.
Preferably, the sealing part is a sealing ring sleeved on the intermediate joint.
Preferably, the conductive corrosion-resistant coating is one metal of zinc, tin, silver, platinum and gold.
Preferably, the net end and the pipe end of the intermediate joint are integrally formed.
Preferably, the anti-overflow baffle of the cable joint waterproof box is provided with a wire connecting hole matched with the periphery of the sealing part.
In some embodiments, the method for cold connecting the grounding lead of the middle joint of the high-voltage cable comprises the following steps S100 to S700 performed in sequence:
s100, stripping the outer sheath of the high-voltage cable in a first length operation area at a connecting point, and cleaning the outer surface of the aluminum sheath in the operation area;
s200, tightly winding a mesh end metal wire of an intermediate joint around the outer surface of the aluminum sheath in the operation area, and then binding and fixing the mesh end metal wire of the intermediate joint on the outer surface of the aluminum sheath;
s300, covering all the operation area by wrapping waterproof self-adhesive tapes beyond the two ends of the operation area by second lengths;
s400, covering all the operation areas by wrapping third lengths of the insulating self-adhesive tapes beyond the two ends of the operation areas;
s500, covering all the operation area by wrapping semi-conductive belts with fourth lengths which exceed the two ends of the operation area;
s600, the intermediate connector penetrates through an anti-overflow baffle of the cable connector waterproof box, the sealing part is clamped on the anti-overflow baffle, and a grounding lead is inserted into the pipe end of the intermediate connector and is fixedly pressed;
s700, after wrapping all semi-conducting belts by using a cable joint waterproof box, sealing two side ports of the cable joint waterproof box by using waterproof self-adhesive belts; and (3) pouring waterproof insulating resin into the cable joint waterproof box.
Preferably, the third length is equal to or greater than the second length.
Preferably, the fourth length is greater than the third length.
Preferably, in the step S100, after the filler layer is removed, the oxide layer on the outer surface of the aluminum sheath is removed by using a reducing water agent, and then the water on the outer surface of the aluminum sheath is removed by using a neutral water absorbent.
Preferably, in the step S200, the mesh-end wire of the intermediate joint is bound and fixed to the outer surface of the aluminum sheath by using a plurality of copper-clad rolled strips arranged at intervals.
The technical scheme of the invention has the advantages that the method is not limited to: the process flow is simple, and the working period is short, so that the difficulty of the connecting working technology is greatly reduced compared with that of a lead-lined method; the cold connection does not need to be ignited, and compared with a lead-lined method, oxygen is additionally supplied to burn and heat tin lining during construction in the tunnel, the method is safer and more reliable, and the hidden danger of construction in the tunnel is reduced; the contact area between the sheath aluminum material and the grounding copper material is large, the copper-aluminum transition is carried out by utilizing the metal wire with the conductive corrosion-resistant coating, the electrical performance is good, the possibility of fault hidden danger caused by the increase of the direct contact resistance of the copper-aluminum is reduced, and the faults such as high-voltage breakdown and the like are prevented; a sealing part clamped on an anti-overflow baffle of a cable joint waterproof box is arranged between the net end and the pipe end of the intermediate joint, so that a gap is prevented from being formed between resin and a metal wire of a plurality of strands of grounding leads at the anti-overflow baffle during resin infusion, and the potential fault caused by water inflow is avoided; due to the fact that a tin coating process is avoided, a tin bag with an unfixed diameter does not exist, the waterproof boxes with the unique diameter can be uniformly configured according to the diameter specification of the high-voltage cable, standardized construction and material preparation are achieved, standardized construction steps and acceptance indexes are achieved, and fine management is further achieved.
Drawings
FIG. 1 is a schematic cross-sectional view illustrating a connection between a high voltage cable and a ground lead in the prior art;
FIG. 2 is a flow chart of a method for cold connecting the grounding leads of the middle joint of a medium-high voltage cable according to an embodiment of the present invention;
fig. 3 is a schematic axial sectional view of a cable of a medium-high voltage cable grounding system according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view taken along line A of FIG. 3;
FIG. 5 is a schematic diagram of the waterproof box shown in FIG. 3;
FIG. 6 is a schematic cross-sectional view of the seal of FIG. 3;
the anti-overflow device comprises a waterproof box 1, a waterproof box 2, resin 3, a tin bag 4, an earth lead 5, an aluminum sheath 6, a filler layer 7, an outer sheath 8, a tinfoil layer 9, a net end 10, a copper-plated rolled tape 11, a waterproof self-adhesive tape 12, an insulating self-adhesive tape 13, a semi-conductive tape 14, a pipe end 15, an earth wire hole 16, a cable hole 17, an anti-overflow baffle 18 and a sealing part.
Detailed Description
It should be noted first that, as shown in fig. 1, the method for connecting the aluminum sheath 5 of the high-voltage cable and the grounding lead 4 by the lead-lined method in the prior art is as follows: after the lead-tin alloy layer is enameled on the aluminum sheath 5, the tin-plated grounding lead is welded on the lead-tin alloy layer, then the waterproof box 1 is sleeved after the wrapping and sealing treatment is carried out, and resin 2 is poured in the waterproof box 1, so that the construction of the connection process is finished. Some embodiments may employ pure tin ingots having greater than 98% tin by weight for lead-tin alloys for environmental reasons. The problem of prior art is mainly that 5 external diameters of aluminum sheath are great, and the enameling process requires to form around the complete firm tin ring of aluminum sheath, and this step needs high temperature heating, but if long-time high temperature, the aluminum sheath surface forms the oxide layer easily and makes the cavity appear in the tin aluminium faying surface, if the heating time is not enough, the tin aluminium faying surface is insecure, and the tin ring drops easily and causes into water influence ground effect. Under some special circumstances, the tin ring also can the fracture drop, in order to prevent that the tin ring from droing, operating personnel need bore the tin ring into apple type or pyriform tin package 3, and these tin package 3's diameter is irregular, is difficult to the waterproof box of the fixed internal diameter specification of adaptation, chooses for use the waterproof box of big internal diameter can need more resin, uses the waterproof box of little internal diameter can not wrap up the tin package completely. In order to obtain a better sealing effect, the length of the stripped outer jacket 7 at the joint is about 80cm on average, and a skilled operator can make 50 cm. In the prior art, the problem of on the other hand lies in, ground lead generally is stranded copper line, like 240 square millimeter's 64 strands copper lines, during the encapsulating, easily forms the gap between the anti-overflow baffle department resin of waterproof box and the single strand copper line, these gaps are the direct-through tin package, tin package itself can think and exist the clearance between the resin, when tin package itself has the defect, the water vapor passageway outside the direct-through waterproof box will appear as an organic whole to the crack of single strand copper line, tin package surface and tin package defect department, cause the outward appearance intact, but inside hidden danger that can not satisfy the insulation requirement.
In the present invention, the cables are all armored high-voltage cables unless otherwise specified. The high-voltage cable refers to a power cable for transmitting 1kv to 1000kv, and is applied to transmission and distribution of power, and an exemplary armored high-voltage cable in fig. 1 has a structure from inside to outside: conductor, insulating layer, inner sheath, aluminium sheath 5, packing layer 6 and oversheath 7.
Example one
As shown in fig. 2 to 6, the method for cold connecting the grounding lead of the middle joint of the high-voltage cable in the embodiment of the method is used for connecting the aluminum sheath of the cable into the grounding system at the connection position, and comprises the following steps S100 to S700.
S100, cutting off the outer sheath 7 with a first length around the cable connecting point, taking the length as an operation area, and cleaning the filler layer 6 between the outer sheath 7 and the aluminum sheath 5 in the operation area to fully expose the metal outer surface of the aluminum sheath. Exemplarily, in the present embodiment, the first length is 40 cm. In other embodiments of the present invention, the first length is greater than 30 cm.
S200, tightly winding a mesh end 9 metal wire of the intermediate joint around the outer surface of the aluminum sheath 6 of the operation area, and binding and fixing the end of the copper woven belt 9 on the outer surface of the mesh end 9 metal wire of the intermediate joint by a plurality of copper-plated rolling belts 10 which are arranged at intervals outside the mesh end 9 metal wire 8 of the intermediate joint. Preferably, in this embodiment, a tinfoil layer 8 is arranged between the outer surface of the aluminum sheath 6 and the wire of the mesh end 9 of the intermediate joint, the tinfoil layer 8 is a continuous multilayer winding tinfoil, the number of winding layers is greater than or equal to 3, the tinfoil material is pure tin of tetragonal system with a weight percentage content greater than 99%, the specification of the copper woven belts is 240 square millimeters, and 4 tinfoil layers are arranged at an interval of 10cm between the copper-plated rolled belts. In some embodiments, the tinfoil material may also be tin-lead alloy or tin-aluminum alloy with good ductility.
Illustratively, the mesh end 9 of the intermediate joint is woven in the form of a ribbon, and figure 3 specifically provides a form of wrapping the ribbon mesh end in an annular shape in which the mesh end 9 woven ribbon wraps around the aluminum sheath 5 a plurality of times in a direction opposite to the direction of wrapping of the tinfoil.
S300, covering the copper-plated rolled strip 10 outside the operation area and beyond the covering outer sheaths 7 of the second lengths at two ends of the operation area by using a plurality of layers of lapping wrapping covering by half of the waterproof self-adhesive tape 11. Exemplarily, in the present embodiment, the waterproof self-adhesive tape 11 is wrapped and covered by more than two layers, and the second length is 10cm, that is, the total length of the wrapped package is 60 cm.
S400, covering the waterproof self-adhesive tape 11 outside the operation area and beyond the covering outer sheaths 7 of the third lengths at the two ends of the operation area by using a plurality of layers of lapping of one half of the insulating self-adhesive tape 12. In an exemplary embodiment, the insulating self-adhesive tape 12 is wrapped and covered by more than two layers, the third length is 10cm, and the total length of the wrapping is 60 cm.
And S500, covering the outer side of the insulating self-adhesive tape 12 of the operation area and the covering outer sheaths 7 which exceed the fourth length of the two ends of the operation area by using a plurality of layers of lapping semi-conductive tapes 13. In an exemplary embodiment, the semi-conductive tape is wrapped and covered by more than one layer, the fourth length is 15cm, and the total length of the wrapped and wrapped tape is 70 cm.
S600, the intermediate connector penetrates through an anti-overflow baffle 17 of the cable connector waterproof box 1, the sealing part 18 is clamped on the anti-overflow baffle 17, the grounding lead 4 is inserted into the pipe end 14 of the intermediate connector and is pressed and fixed, specifically, the pipe end 14 of the intermediate connector inserted into the grounding lead 4 is pressed and flattened, so that the grounding lead 4 is fixedly connected, and a multilayer waterproof tape is wrapped on the periphery of the exposed metal part of the outer grounding lead 4 and the pipe end of the waterproof box 1. In the present embodiment, the specification of the ground lead 4 is 240 mm square, and the wrapping waterproof tape has two or more layers. In this embodiment, the intermediate joint is required to be clamped on the ground wire hole 15 of the anti-overflow baffle 17 of the waterproof box 1, the intermediate joint is made of pure copper, a sealing portion 18 is arranged between the intermediate joint and the ground wire hole 15, specifically, the sealing portion 18 is a cylinder integrally arranged with the end of the intermediate joint pipe, and an O-shaped sealing ring is arranged outside the cylinder. In this embodiment, in order to optimize the leakproofness of the external ground lead 4 one end lead-out wire department of waterproof box 1, establish ground wire hole 15 in addition at this end of waterproof box 1, better sealed when forming the encapsulating on one side to and prevent the microgap that appears around the little strand copper wire, avoid causing into water. In other embodiments, the waterproof box 1 is not provided with the ground wire hole 15, the sealing part of the intermediate connector clamped at the anti-overflow baffle 17 is a cylinder with a crescent-shaped section, the concave side of the sealing part faces the cable outer sheath, and the convex side faces the inner side surface of the cable hole 16 of the anti-overflow baffle 17.
In particular, if crimping head 14 is located outside waterproof box 1, waterproof tape should be wrapped around all exposed metal portions of copper braid 9, crimping head 14 and ground lead 4.
The waterproof box of the cable joint is selected as the waterproof box 1, after the waterproof box is wrapped by all the semi-conducting tapes, the ports at two sides of the waterproof box of the cable joint are sealed by the waterproof self-adhesive tapes, and the waterproof box is prevented from overflowing out of the waterproof box 1 when resin is poured. Exemplarily, in the embodiment, the cable joint waterproof box is 80cm to fully cover and exceed the area with the length of 70cm covered by the semi-conductive belt, the cable joint waterproof box is two semicircular boxes, the outer diameter of the box body of the cable joint waterproof box is 18cm, the inner diameter of a cable hole 16 formed by an anti-overflow baffle 17 at two ends of each semicircular box and used for clamping a cable is 12cm, the cable with the outer diameter smaller than 24cm can be clamped, and two communicated glue injection holes are arranged above the box body of the cable joint waterproof box.
S700, after wrapping all semi-conducting belts by using a cable joint waterproof box, sealing two side ports of the cable joint waterproof box by using waterproof self-adhesive belts; and (3) pouring waterproof insulating resin into the cable joint waterproof box. Specifically, the waterproof box of the cable joint is horizontally placed, the glue injection hole of the waterproof box is filled with resin 2, the resin 2 is made of waterproof insulating resin, after the waterproof insulating resin is placed for a period of time, the glue injection hole of the waterproof box of the cable joint is filled with the waterproof insulating resin again, and then the glue injection hole of the waterproof box of the cable joint is covered. Exemplarily, in the present embodiment, the standing time period is 15 minutes. In this embodiment, after the waterproof box 1 is fastened, the gum inside the waterproof box 1 can only overflow from the gap between the cable hole 16 and the cable outer sheath 7 and the gap between the ground wire hole 15 and the sealing part 18, so that complete sealing is achieved.
In this embodiment, waterproof box 1 is two upper and lower half boxes, be equipped with assorted sealing groove face at the hookup location of two half boxes, compress tightly two fixed half boxes in respective sealing groove face through a plurality of bolts behind two half boxes of lock before pouring into the resin, make the hookup location of two half boxes when the resin cooling inflation, can bear certain pressure and not spill the resin, and then make the resin produce two extrusion directions, an extrusion direction is that make the resin spill over to the gap department of anti-overflow baffle 17, another extrusion direction is that outside-in reduces contact resistance with net end 9 pressure to 5 directions of aluminium sheath.
The working principle of the embodiment is as follows: the cold connection method is adopted to avoid heating, and under the condition of containing the tin foil layer, the combination of the outer surface of the aluminum material which is deoxidized and the tin material is easier. In the case of a method of soldering a heated aluminum material, in contrast, the surface of the aluminum material is easily oxidized and covered with an aluminum oxide film, and even if the aluminum oxide film is scraped off before soldering, an oxide film is rapidly formed on the soldering surface due to the high temperature of the soldering iron during soldering, and a contact surface having a low resistance is satisfactorily formed. Use integrative intermediate head to connect aluminium sheath surface and ground lead to encapsulate in waterproof box, during the resin encapsulating, can avoid waterproof box anti-overflow baffle department stranded copper line and resin between have small gap, stop the aqueous vapor and directly link the aluminium sheath surface from gap department. The middle part of the middle joint is provided with an integrated cylindrical surface. The anti-overflow baffle plate is easy to form a continuous adhesive surface with resin, has a secondary sealing effect relative to a sealing plug at the anti-overflow baffle plate, and also cuts off a resin gap between a copper mesh wire and an aluminum sheath directly connected with a grounding lead in the prior art.
Example two
The difference between the cold connection method of the grounding lead of the intermediate joint of the high-voltage cable in the embodiment of the method and the first embodiment is that in the step S100, after the filler layer is removed, the reducing water agent is used for removing the oxide layer on the outer surface of the aluminum sheath, and then the neutral water absorbent is used for removing the water on the outer surface of the aluminum sheath. In the present embodiment, the reducing aqueous solution is an aqueous solution of sodium hydroxide and sodium nitrate, wherein the concentration of the sodium hydroxide is 40 to 80g/L, and the weight ratio of the sodium hydroxide to the sodium nitrate is 1: 2; the neutral water absorbent is absolute alcohol or absolute acetone.
This embodiment aim at provides better aluminium tin composition surface to when high tension cable generates heat in the operation, the molecule exchange is carried out more easily to aluminium tin composition surface both sides alloplasm material, produces the cold welding effect.
EXAMPLE III
The difference between the cold connection method for the grounding lead of the intermediate joint of the high-voltage cable and the first embodiment is that in the step S200, gallium cold welding flux is coated outside each layer of the tin foil when the tin foil is wrapped around the operation area, in the step S700 of curing and heat releasing of the waterproof insulating resin, the gallium cold welding flux can solidify the multiple layers of the tin foil into a whole, the strength is increased, meanwhile, an expanded and stable structure is formed on a tin-copper joint surface, and the tin-copper structure cannot be degraded due to the operation temperature of the high-voltage cable in the time between the completion of construction and the formation of a permanent welding structure.
It is noted that the terminology used in the examples of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
In the description above, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Claims (9)
1. A cold connection method for a grounding lead of a middle joint of a high-voltage cable is characterized in that the middle joint is used for connecting the outer surface of an aluminum sheath of the high-voltage cable and the grounding lead;
one end of the middle joint, which is connected with the outer surface of the aluminum sheath, is a net end woven by metal wires with a conductive corrosion-resistant coating; the end, connected with the grounding lead, of the middle joint is a pipe end, the pipe end is used for inserting the grounding lead and pressing and fixing the grounding lead and the middle joint, and a sealing part used for being clamped on an anti-overflow baffle of a cable joint waterproof box is arranged between the net end and the pipe end of the middle joint;
the connection method includes the following steps S100 to S700:
s100, stripping the outer sheath of the high-voltage cable in an operation area with a first length at a connecting point, and cleaning the outer surface of the aluminum sheath in the operation area;
s200, tightly winding a mesh end metal wire of an intermediate joint around the outer surface of the aluminum sheath in the operation area, and then binding and fixing the mesh end metal wire of the intermediate joint on the outer surface of the aluminum sheath;
s300, covering all the operation area by wrapping waterproof self-adhesive tapes beyond the two ends of the operation area by second lengths;
s400, covering all the operation areas by wrapping third lengths of the insulating self-adhesive tapes beyond the two ends of the operation areas;
s500, covering all the operation area by wrapping semi-conductive belts with fourth lengths which exceed the two ends of the operation area;
s600, the intermediate connector penetrates through an anti-overflow baffle of the cable connector waterproof box, the sealing part is clamped on the anti-overflow baffle, and a grounding lead is inserted into the pipe end of the intermediate connector and is fixedly pressed;
s700, after wrapping all semi-conducting belts by using a cable joint waterproof box, sealing two side ports of the cable joint waterproof box by using waterproof self-adhesive belts; and (3) pouring waterproof insulating resin into the cable joint waterproof box.
2. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: the third length is greater than or equal to the second length.
3. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: the fourth length is greater than the third length.
4. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: in the step S100, after the filler layer is removed, the oxide layer on the outer surface of the aluminum sheath is removed by using a reducing water agent, and then the moisture on the outer surface of the aluminum sheath is removed by using a neutral water absorbent.
5. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: the sealing part comprises a sealing ring sleeved on the middle joint.
6. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: the conductive corrosion-resistant coating is one metal of zinc, tin, silver, platinum and gold.
7. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: the net end and the pipe end of the middle joint are integrally formed.
8. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: in the step S200, the mesh-end wire of the intermediate joint is bound and fixed to the outer surface of the aluminum sheath by using a plurality of copper-plated rolled strips arranged at intervals.
9. The cold connecting method of grounding lead of intermediate joint of high-voltage cable according to claim 1, characterized in that: and the anti-overflow baffle of the cable joint waterproof box is provided with a wire connecting hole matched with the periphery of the sealing part.
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| CN202010445016.9A CN111697405B (en) | 2020-05-23 | 2020-05-23 | Cold connection method for grounding lead of intermediate joint of high-voltage cable |
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| CN202010445016.9A CN111697405B (en) | 2020-05-23 | 2020-05-23 | Cold connection method for grounding lead of intermediate joint of high-voltage cable |
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| CN112382904A (en) * | 2020-12-09 | 2021-02-19 | 安徽康泰电气有限公司 | Connection method of locomotive high-voltage cable connector |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9306677D0 (en) * | 1993-03-31 | 1993-05-26 | Raychem Sa Nv | Sealing ground wires using heat-shrinkable sleeves |
| CN2641879Y (en) * | 2003-08-26 | 2004-09-15 | 郑州电缆(集团)股份有限公司 | Non-breaking type high voltage cable grounding device |
| KR101135143B1 (en) * | 2004-03-01 | 2012-04-16 | 후루카와 덴키 고교 가부시키가이샤 | Cable connecting structure |
| KR100851249B1 (en) * | 2008-05-09 | 2008-08-08 | (주)한화종합기술단 | Branch sleeve of power line |
| JP5688242B2 (en) * | 2010-07-14 | 2015-03-25 | 矢崎総業株式会社 | Shield wire ground wire connection structure |
| CN202978201U (en) * | 2012-04-24 | 2013-06-05 | 天津市电力公司 | Intelligent high-voltage cable joint of built-in partial discharge sensor |
| CN103531986B (en) * | 2013-10-16 | 2016-05-25 | 广东吉熙安电缆附件有限公司 | A kind of earthing method of cable armouring |
| CN204668903U (en) * | 2015-05-14 | 2015-09-23 | 国家电网公司 | A kind of 110kV cable intermediate joint |
| CN104967066A (en) * | 2015-06-11 | 2015-10-07 | 天津送变电工程公司 | Crosslinked cable prefabricated intermediate joint installation method |
| CN204947556U (en) * | 2015-06-12 | 2016-01-06 | 特变电工昭和（山东）电缆附件有限公司 | The transition joint of a kind of 66 ~ 220kV aluminium conductor crosslinked cable |
| CN205487486U (en) * | 2016-03-30 | 2016-08-17 | 国网山东省电力公司青岛供电公司 | High tension cable metallic sheath ground structure |
| CN205882666U (en) * | 2016-08-10 | 2017-01-11 | 北京国电四维电力技术有限公司 | Prefabricated formula intermediate head of cross -linked polyethylene insulated cable |
| CN206412738U (en) * | 2017-01-23 | 2017-08-15 | 南京电力工程设计有限公司 | A kind of cable grounding housing |
| CN107706879A (en) * | 2017-11-07 | 2018-02-16 | 广州高力电缆附件有限公司 | A kind of cable intermediate joint and its fabrication and installation method |
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Effective date of registration: 20210525 Address after: 100031 No. 86 Chang'an Street, Xicheng District, Beijing Applicant after: STATE GRID CORPORATION OF CHINA Applicant after: STATE GRID HEBEI ELECTRIC POWER SUPPLY Co.,Ltd. Applicant after: SHIJIAZHUANG POWER SUPPLY BRANCH OF STATE GRID HEBEI ELECTRIC POWER Co.,Ltd. Applicant after: Shijiazhuang Sikai Power Construction Co.,Ltd. Address before: 100031 No. 86 West Chang'an Avenue, Beijing, Xicheng District Applicant before: STATE GRID CORPORATION OF CHINA Applicant before: STATE GRID HEBEI ELECTRIC POWER SUPPLY Co.,Ltd. Applicant before: SHIJIAZHUANG POWER SUPPLY BRANCH OF STATE GRID HEBEI ELECTRIC POWER Co.,Ltd. |
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