CN112202012B - Connector and repair device for bad electrical contact inside high-voltage cable - Google Patents
Connector and repair device for bad electrical contact inside high-voltage cable Download PDFInfo
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- CN112202012B CN112202012B CN202011002251.5A CN202011002251A CN112202012B CN 112202012 B CN112202012 B CN 112202012B CN 202011002251 A CN202011002251 A CN 202011002251A CN 112202012 B CN112202012 B CN 112202012B
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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
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0462—Tubings, i.e. having a closed section
- H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/42—Insulated conductors or cables characterised by their form with arrangements for heat dissipation or conduction
- H01B7/428—Heat conduction
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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
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/46—Bases; Cases
- H01R13/502—Bases; Cases composed of different pieces
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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
- H01R24/00—Two-part coupling devices, or either of their cooperating parts, characterised by their overall structure
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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
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0406—Details thereof
Abstract
The invention discloses a connector, comprising: the connecting structure comprises a first connecting main body and a second connecting main body which are in a semi-circular arc shape; the first connecting body and the second connecting body are connected through a buckle assembly; the first connecting body and the second connecting body are respectively provided with an outer shell, an inner shell and a semicircular inner hole; the semicircular inner hole is clamped with an insulation shielding layer of the cable, and the inner shell is sleeved on the outer surface of the cable; the first connecting main body is further provided with a through pipe hole, and the pipe hole is formed between the insulating shielding layer and the aluminum sheath layer of the cable. The invention also discloses a device for repairing the poor electrical contact in the high-voltage cable, which comprises: a pressurized gas cylinder, a repair liquid storage bottle, repair liquid, a first liquid guide pipe, a residual liquid collector, a vacuum pump and the connector. The invention can effectively improve the electric contact performance between the insulating shielding layer of the cable and the aluminum sheath, and reduce the failure rate of the cable caused by poor contact between the insulating shielding layer of the cable and the aluminum sheath, thereby greatly improving the operation reliability of the cable with the defects.
Description
Technical Field
The invention relates to the technical field of high-voltage cable safety, in particular to a connector and a device for repairing poor electrical contact inside a high-voltage cable.
Background
With the acceleration of the urbanization process and the rapid increase of urban power consumption, the demand of high-voltage cables is rapidly increased. Compared with other cables, the cross-linked polyethylene (XLPE) insulated cable has the outstanding advantages of excellent electrical and mechanical properties, good heat resistance, convenient installation and maintenance, no need of oil and gas supply equipment and the like, thereby having wider application. However, in recent years, high-voltage XLPE cable body faults caused by ablation of cable buffer layers occur in beijing, shanghai, guangzhou, Nanjing, Australia and the like, and the high attention of experts and scholars in the cable industry is attracted.
The high-voltage XLPE cable buffer layer is generally positioned between the metal sheath and the insulating and shielding layer and has the semi-conductive characteristic, so that the insulating and shielding layer and the metal sheath layer are in good electrical contact, the requirement of thermal expansion in the operation of a compensation cable is met, and the extrusion damage of the thermal expansion and the mechanical stress in the construction and installation process to the insulating layer and the shielding layer is avoided. The phenomena of cable failure of multiple buffer layer ablation occurred in recent years mainly include: a plurality of ablation traces exist on the inner walls of the cable insulation shielding layer, the buffer layer and the corrugated aluminum sheath, and a large number of white spots (white powder is similar to an insulator) are arranged on the surface of part of the buffer layer; the buffer layer clearance is generally larger, the aluminum sheath has poor integrity or the buffer layer resistivity is higher, and the specification requirement is exceeded. White spots of the insulator between the insulation shield and the aluminum sheath, large air gaps and high resistivity of the buffer layer greatly reduce the electrical connection characteristic between the cable insulation shield layer and the metal aluminum sheath, thereby affecting the performance of the cable. Because a large number of similar defective cables exist in high-voltage XLPE insulated cables transported nationwide at present, if all the cables are replaced, a large amount of capital is required to be invested for modification. If left alone, the device brings great safety hazards and can cause greater economic loss. How to effectively improve the operation reliability of the cable with the defects is a key problem to be solved urgently at present.
Disclosure of Invention
The embodiment of the invention provides a connector and a device for repairing poor electrical contact inside a high-voltage cable, which can effectively improve the electrical contact performance between an insulating shielding layer and an aluminum sheath of the high-voltage cable, and greatly reduce the cable fault rate caused by poor contact between the insulating shielding layer and the aluminum sheath of the cable, thereby greatly improving the operation reliability of the defective cable.
An embodiment of the present invention provides a connector, including: the connecting structure comprises a first connecting main body and a second connecting main body which are in a semi-circular arc shape; the ports of the first connecting body and the second connecting body are respectively provided with a buckle assembly, and the first connecting body and the second connecting body are connected through the buckle assemblies;
the first connecting body and the second connecting body are respectively provided with an outer shell, an inner shell and a semicircular inner hole; the outer shell is sleeved on the outer side of the inner shell, the semicircular inner hole penetrates through the outer shell and the inner shell, the semicircular inner hole is clamped with an insulation shielding layer of a cable, and the inner shell is sleeved on the outer surface of the cable;
the first connecting main body is further provided with a pipe hole penetrating through the outer shell and the inner shell of the first connecting main body, the pipe hole is formed between the insulating shielding layer and the aluminum sheath layer of the cable, and the pipe hole is connected with a first liquid guide pipe in the repair device for poor electrical contact in the high-voltage cable in a matching mode.
As a modification of the above, the connector further includes a first coupling pad layer provided on an outer side wall of the inner housing; the inner shell is in contact connection with the outer surface of the cable through the first connection pad layer.
As an improvement of the above scheme, the connector further comprises a second connecting cushion layer arranged on the inner side wall of the semicircular inner hole; and the semicircular inner hole is in contact connection with the insulating shielding layer of the cable through the second connecting cushion layer.
Another embodiment of the present invention correspondingly provides a device for repairing poor electrical contact inside a high voltage cable, including: a pressurized gas cylinder, a repair liquid storage bottle, repair liquid, a first liquid guide pipe, a residual liquid collector, a vacuum pump and the connector; the repair liquid is stored in the repair liquid storage bottle, and the pressurized gas cylinder is connected with the repair liquid storage bottle; the repair liquid storage bottle is connected with a connector sleeved at the first end of the cable through the first liquid guide pipe, so that the repair liquid is injected between the insulation shielding layer and the aluminum sheath layer of the cable; the connector sleeved at the second end of the cable is connected with the residual liquid collector, and the residual liquid collector is connected with the vacuum pump.
As an improvement of the above scheme, the repair device further comprises a first control valve arranged at the end of the repair liquid storage bottle; the first control valve is mounted on the first catheter.
As an improvement of the above scheme, the repair device further comprises a second liquid guide pipe and a second control valve arranged at the end of the pressurization gas bottle; the pressurized gas cylinder is connected with the restoration liquid storage bottle through the second liquid guide pipe, and the second control valve is installed on the second liquid guide pipe.
As an improvement of the scheme, the repairing device also comprises a third liquid guide pipe and a third control valve arranged at the residual liquid collector end; the connector sleeved at the second end of the cable is connected with the residual liquid collector through the third liquid guide pipe, and the third control valve is installed on the third liquid guide pipe.
As an improvement of the above scheme, the repair device further comprises a fourth liquid guide pipe and a fourth control valve arranged at the vacuum pump end; the residual liquid collector is connected with the vacuum pump through the fourth liquid guide pipe, and the fourth control valve is arranged on the fourth liquid guide pipe.
As an improvement of the scheme, the pressurized gas cylinder is a high-pressure nitrogen cylinder or a compressed air pump.
As an improvement of the scheme, the repair liquid is made of a conductive liquid material.
Compared with the prior art, the device for repairing bad electrical contact in the connector and the high-voltage cable disclosed by the embodiment of the invention has the following beneficial effects:
the connector is provided with a semicircular arc-shaped first connecting body and a semicircular arc-shaped second connecting body, the port positions of the first connecting body and the second connecting body are respectively provided with a buckle component, the first connecting body and the second connecting body are connected through the buckle components, the first connecting body and the second connecting body are respectively provided with an outer shell, an inner shell and a semicircular inner hole, the outer shell is sleeved on the outer side of the inner shell, the semicircular inner hole penetrates through the outer shell and the inner shell, the semicircular inner hole is clamped with an insulation shielding layer of a cable, the inner shell is sleeved on the outer surface of the cable, the first connecting body is further provided with a pipe hole penetrating through the outer shell and the inner shell of the first connecting body, the pipe hole is arranged between the insulation shielding layer and an aluminum sheath layer of the cable, and the pipe hole is connected with a first catheter in a repairing device with bad electrical contact inside a high-voltage cable in a matching manner, the cable that can be applicable to unable direct penetration has stronger suitability to can effectively realize the in close contact with of connector and cable insulation shielding layer, prevent that repair liquid from flowing from the insulation shielding layer interface department of connector and cable, have good leakproofness, and make in repair liquid pours into the clearance between the insulation shielding layer of cable and the aluminium sheath. Furthermore, the repair device for poor electrical contact in the high-voltage cable is provided with a pressurized gas cylinder, a repair liquid storage bottle, repair liquid, a first liquid guide pipe, a residual liquid collector, a vacuum pump and a connector, the gas in the pressurized gas cylinder extrudes the repair liquid in the repair liquid storage bottle to a first liquid guide pipe, the repair liquid flows between an insulation shielding layer and an aluminum sheath of the cable through a connector arranged at the first end of the cable, the redundant repair liquid flows into a residual liquid collector through a connector arranged at the second end of the cable, the buffer layer between the insulation shielding layer of the high-voltage cable and the aluminum sheath can be effectively avoided from ablation phenomena such as discharge or overheating, the electric contact performance between the insulation shielding layer of the high-voltage cable and the aluminum sheath is effectively improved, the cable fault rate caused by poor contact between the insulation shielding layer of the cable and the aluminum sheath is greatly reduced, and therefore the operation reliability of the cable with the defects is greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a connector according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a cable according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a repair device for poor electrical contact inside a high-voltage cable according to a second embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a schematic structural diagram of a connector according to an embodiment of the present invention, fig. 1(a) is a cross-sectional view of the connector, fig. 1(b) is a side view of the connector, and fig. 2 is a schematic structural diagram of a cable according to an embodiment of the present invention. Wherein the connector comprises: a first connecting body 11 and a second connecting body 12 in a semicircular arc shape; the ports of the first connecting body 11 and the second connecting body 12 are both provided with a buckle assembly 13, and the first connecting body 11 and the second connecting body 12 are connected through the buckle assembly 13;
the first connecting body 11 and the second connecting body 12 are respectively provided with an outer shell, an inner shell and a semicircular inner hole; the outer shell is sleeved outside the inner shell, the semicircular inner hole penetrates through the outer shell and the inner shell, the semicircular inner hole is clamped with the insulating shielding layer 81 of the cable 8, and the inner shell is sleeved on the outer surface of the cable 8;
the first connecting main body 11 is further provided with a pipe hole 114 penetrating through the outer shell 111 and the inner shell 112 of the first connecting main body 11, the pipe hole 114 is arranged between the insulating shielding layer 81 and the aluminum sheath layer 82 of the cable 8, and the pipe hole 114 is connected with the first liquid guide pipe 61 in the repair device for poor electrical contact in the high-voltage cable in a matching manner.
The cable 8 according to the present invention is a defective cable in which the contact between the edge shield layer 81 and the aluminum sheath 82 is poor. In this embodiment, the connector is a two-half structure, and is suitable for cables that cannot be directly threaded at two ends. For example, referring to fig. 2, the cable 8 sequentially includes a conductor layer 83, an insulating layer 84, an insulating shielding layer 81, an aluminum sheath layer 82, and an outer sheath layer 85 from inside to outside, two ends of the cable in operation are not disconnected, a cable portion at a cable joint is selectively connected to the connector, and the outer sheath layer 85 of the cable portion is disconnected from the aluminum sheath layer 82 to expose the insulating shielding layer 81. Preferably, the connector is made of a metallic aluminum material that is easy to machine. Specifically, the first connecting body 11 and the second connecting body 12 are provided with an outer shell, an inner shell and a semicircular inner hole. More specifically, the housing 111 of the first connecting body 11 is matched with the housing 121 of the second connecting body 12, and the two housings have the same size and form a half-enclosed structure after being connected. The inner shell 112 of the first connecting body 11 is matched with the inner shell 122 of the second connecting body 12, and the inner shell is sleeved on the inner side of the outer shell, and the two are connected to form a semi-enclosed structure. In addition, the diameter of the inner shell of the cable 8 is slightly larger than the outer diameter of the outer sheath layer 85 of the cable 8, so that the inner shell is fittingly sleeved on the outer surface of the cable 8. The semi-circular inner hole 113 of the first connecting body 11 is matched with the semi-circular inner hole 123 of the second connecting body 12, the sizes of the two are the same, and a through hole penetrating through the outer shell and the inner shell is formed after the two are connected. The diameters of the semicircular inner holes of the first connecting body 11 and the second connecting body 12 are slightly larger than the outer diameter of the insulation shielding layer 81, so that the insulation shielding layer 81 is embedded in the semicircular inner holes. Compared with the second connecting main body 11, the first connecting main body 11 is further provided with a through pipe hole 114, the size of the first liquid guide pipe 61 is matched with the size of the pipe hole 114, and the position of the pipe hole 114 is correspondingly arranged between the insulating shielding layer 81 and the aluminum sheath layer 82 of the cable 8, so that the repairing liquid is injected between the insulating shielding layer 81 and the aluminum sheath layer 82 through the first liquid guide pipe 61. It should be noted that, the dimensions of each of the first connecting body 11 and the second connecting body 12 are consistent with the structure of the cable 8 to be repaired, so that the connector can be effectively in close contact with the insulating and shielding layer of the cable, and the repair liquid is prevented from flowing out from the interface of the connector and the insulating and shielding layer of the cable.
In this embodiment, the snap assembly 13 is used to connect the first connecting body 11 and the second connecting body 12, and the snap assembly 13 may be in the form of a snap or a fastener, but is not limited thereto. Illustratively, the snap assembly 13 is in the form of a snap, and a female snap and a male snap are respectively installed at the ports of the first connecting body 11 and the second connecting body 11, and the number is set according to the size of the connector, so as to ensure that the two connecting bodies can be tightly connected together. The fastening assembly 13 is in the form of a fastening member, and sets of connection holes are respectively provided at the ports of the first connecting body 11 and the second connecting body 12, and the two connecting bodies are connected by the fastening member and the sets of connection holes. Preferably, the fastener can be a screw or a bolt.
Preferably, the connector further comprises a first coupling pad layer disposed on an outer sidewall of the inner case; the inner shell is in contact connection with the outer surface of the cable through the first connection pad layer.
Preferably, the connector further comprises a second connecting cushion layer arranged on the inner side wall of the semicircular inner hole; and the semicircular inner hole is in contact connection with the insulating shielding layer of the cable through the second connecting cushion layer.
In this embodiment, since the outer shell, the inner shell, and the inner hole of the connector are made of hard materials, the connector further includes a first connection pad layer 14 and a second connection pad layer 15 to achieve good sealing performance. The inner shells of the first connecting body 11 and the second connecting body 12 are slightly larger than the outer sheath of the cable 8, and the air gap between the inner shells and the outer surface of the cable 8 can be filled by the first connecting pad 14. Similarly, the diameters of the semicircular inner holes of the first connecting body 11 and the second connecting body 12 are slightly larger than the outer diameter of the insulation shielding layer 81, and the air gap between the semicircular inner holes and the insulation shielding layer 81 can be filled by the second connecting pad layer 15. Preferably, the first and second coupling pads 14 and 15 may be rubber pads. Therefore, the connector has better sealing performance, realizes tight contact and prevents repair liquid from flowing out from the interface of the cable and the connector.
The connector provided by the first embodiment of the invention is provided with a semicircular arc-shaped first connecting main body and a semicircular arc-shaped second connecting main body, wherein the port openings of the first connecting main body and the second connecting main body are respectively provided with a buckle assembly, the first connecting main body and the second connecting main body are connected through the buckle assembly, the first connecting main body and the second connecting main body are respectively provided with an outer shell, an inner shell and a semicircular inner hole, the outer shell is sleeved on the outer side of the inner shell, the semicircular inner hole penetrates through the outer shell and the inner shell, the semicircular inner hole is clamped with an insulating shielding layer of a cable, the inner shell is sleeved on the outer surface of the cable, the first connecting main body is also provided with a pore penetrating through the outer shell and the inner shell of the first connecting main body, the pore is arranged between the insulating shielding layer and an aluminum sheath layer of the cable, and the pore is connected with a first liquid guide pipe in a repairing device with poor electrical contact inside a high-voltage cable in a matching manner, the cable that can be applicable to unable direct penetration has stronger suitability to can effectively realize the in close contact with of connector and cable insulation shielding layer, prevent that repair liquid from flowing from the insulation shielding layer interface department of connector and cable, have good leakproofness, and make in repair liquid pours into the clearance between the insulation shielding layer of cable and the aluminium sheath.
Example two
Referring to fig. 3, a schematic structural diagram of a repair apparatus for poor electrical contact inside a high voltage cable according to a second embodiment of the present invention is shown, including: a pressurized gas cylinder 2, a repair liquid storage bottle 3, repair liquid, a first liquid guide pipe 61, a residual liquid collector 4, a vacuum pump 5 and the connector; the repair liquid is stored in the repair liquid storage bottle 3, and the pressurized gas cylinder 2 is connected with the repair liquid storage bottle 3; the repair liquid storage bottle 3 is connected with a connector 101 sleeved at the first end of the cable 8 through the first liquid guide pipe 61, so that the repair liquid is injected between the insulation shielding layer 81 and the aluminum sheath layer 82 of the cable 8; the connector 102 sleeved on the second end of the cable 8 is connected with the residual liquid collector 4, and the residual liquid collector 4 is connected with the vacuum pump 5.
It should be noted that connectors are respectively installed at two ends of the cable 8, repair liquid is injected into one end, and redundant repair liquid flows out from the other end. The pressurized gas cylinder 2 is used for extruding the repair liquid in the repair liquid storage bottle 3 to a position between the insulation shielding layer 81 and the aluminum sheath layer 82 of the cable 8 through the gas stored in the cylinder. Preferably, the pressurized gas cylinder 2 is a high-pressure nitrogen cylinder or a compressed air pump. Accordingly, the vacuum pump 5 is used to reduce the gas pressure in the residual liquid trap 4 so that the excess repair liquid between the insulation shield 81 and the aluminum sheath 82 of the cable 8 flows into the residual liquid trap 4. Preferably, the vacuum pump 5 may be a device having a function of reducing the air pressure.
Preferably, the repair liquid is made of an electrically conductive liquid material. The repair liquid is used to improve the electrical contact performance between the insulating shield layer 81 and the aluminum sheath layer 82 of the high-voltage cable 8. The repairing liquid does not have compatible reaction with the insulation shielding layer 81 and the aluminum sheath layer 82 of the high-voltage cable, and the buffer layer between the two layers, can be cooled and solidified into a colloidal state at normal temperature under the condition of contacting with air or adding a certain catalyst, and does not have the phenomena of flowing and the like at 70 ℃. Optionally, the repair liquid may be conductive adhesive, conductive grease, or the like, in addition to the conductive liquid.
In a preferred embodiment, the repair device further comprises a first control valve 71 provided at the end of the repair liquid reservoir bottle 3; the first control valve 71 is mounted on the first liquid conduit 61. The first control valve 71 is arranged at the end of the repair liquid storage bottle 3 to control the inflow rate of the repair liquid.
In a preferred embodiment, the rehabilitation device further comprises a second liquid guide pipe 62 and a second control valve 72 arranged at the end of the pressurized gas cylinder 2; the pressurized gas cylinder 2 is connected with the repair liquid storage cylinder 3 through the second liquid guide pipe 62, and the second control valve 72 is installed on the second liquid guide pipe 62. Control of the inlet air rate is achieved by providing a second control valve 72 at the end of the pressurised gas cylinder 2.
In a preferred embodiment, the reconditioning device further comprises a third liquid guide pipe 63 and a third control valve 73 arranged at the end of the residual liquid collector 4; the connector 102 sleeved on the second end of the cable 8 is connected with the residual liquid collector 4 through the third liquid guide pipe 63, and the third control valve 73 is installed on the third liquid guide pipe 63. The injection rate of the remediation liquid is controlled by providing a third control valve 73 at the raffinate collector 4.
In a preferred embodiment, the prosthetic device further comprises a fourth catheter 64 and a fourth control valve 74 provided at the vacuum pump 5 side; the residual liquid collector 4 is connected with the vacuum pump 5 through the fourth liquid guide pipe 64, and the fourth control valve 74 is installed on the fourth liquid guide pipe 64. The injection rate of the healing liquid is further varied by providing a fourth control valve 74 at the vacuum pump 5 to control the rate of evacuation of the remaining liquid trap 4.
The corresponding repairing method of the repairing device for the poor electric contact in the high-voltage cable comprises the following steps:
1) selecting a defective cable with poor contact between an insulation shielding layer of a section of high-voltage cable and an aluminum sheath. The cable transmission line can be found by means of partial discharge detection, X-ray shooting, direct observation of the migration and modification process and the like.
2) And preprocessing the defective cable. The contact resistance between the insulation shielding layer of the section of the defective cable test sample and the aluminum sheath layer is detected by adopting a universal meter, and the contact resistance is used for important performance parameters of performance comparison before and after the defective cable is repaired. Specifically, one end of the multimeter is connected to the shielding layer of the defective cable sample, and the other end of the multimeter is connected to the aluminum sheath.
3) After the contact resistance test between the insulation shielding layer and the aluminum sheath layer of the defective cable sample is completed, connectors are connected to the two ends of the defective cable, and the specific connection mode is shown in fig. 3.
4) After the repair device is installed, a third control valve arranged at the residual liquid collector end, a fourth control valve arranged at the vacuum pump end, a first control valve arranged at the repair storage bottle end and a second control valve arranged at the pressurization gas bottle end are opened in sequence. The speed of the repair liquid entering the insulating shielding layer and the aluminum sheath layer of the defective cable is controlled by controlling the output size of each control valve.
5) And after the residual liquid collector collects the repair liquid with the preset volume, considering that the injection degree of the repair liquid meets the required requirement, and closing all the control valves.
6) Standing for 24h at normal temperature until the repair liquid is cooled and solidified between the insulation shielding layer and the aluminum sheath layer of the defective cable.
7) And measuring the contact resistance between the insulation shielding layer of the cable and the aluminum sheath layer again to finish repairing.
The repairing device for poor electrical contact in the high-voltage cable provided by the embodiment of the invention is characterized in that a pressurizing gas cylinder, a repairing liquid storage bottle, a repairing liquid, a first liquid guide pipe, a residual liquid collector, a vacuum pump and a connector are arranged, the gas in the pressurized gas cylinder extrudes the repair liquid in the repair liquid storage bottle to a first liquid guide pipe, the repair liquid flows between an insulation shielding layer and an aluminum sheath of the cable through a connector arranged at the first end of the cable, the redundant repair liquid flows into a residual liquid collector through a connector arranged at the second end of the cable, the buffer layer between the insulation shielding layer of the high-voltage cable and the aluminum sheath can be effectively avoided from ablation phenomena such as discharge or overheating, the electric contact performance between the insulation shielding layer of the high-voltage cable and the aluminum sheath is effectively improved, the cable fault rate caused by poor contact between the insulation shielding layer of the cable and the aluminum sheath is greatly reduced, and therefore the operation reliability of the cable with the defects is greatly improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A connector, comprising: the connecting structure comprises a first connecting main body and a second connecting main body which are in a semi-circular arc shape; the ports of the first connecting body and the second connecting body are respectively provided with a buckle assembly, and the first connecting body and the second connecting body are connected through the buckle assemblies;
the first connecting body and the second connecting body are respectively provided with an outer shell, an inner shell and a semicircular inner hole; the outer shell is sleeved on the outer side of the inner shell, the semicircular inner hole penetrates through the outer shell and the inner shell, the semicircular inner hole is clamped with an insulation shielding layer of a cable, and the inner shell is sleeved on the outer surface of the cable;
the first connecting main body is further provided with a pipe hole penetrating through the outer shell and the inner shell of the first connecting main body, the pipe hole is formed between the insulating shielding layer and the aluminum sheath layer of the cable, and the pipe hole is connected with a first liquid guide pipe in the repair device for poor electrical contact in the high-voltage cable in a matching mode.
2. The connector of claim 1, further comprising a first coupling pad disposed on an outer sidewall of the inner housing; the inner shell is in contact connection with the outer surface of the cable through the first connection pad layer.
3. The connector of claim 1, further comprising a second coupling pad disposed on an inner sidewall of the semicircular bore; and the semicircular inner hole is in contact connection with the insulating shielding layer of the cable through the second connecting cushion layer.
4. A repair device for poor electrical contact inside a high-voltage cable is characterized by comprising: a pressurized gas cylinder, a repair fluid reservoir cylinder, repair fluid, a first catheter, a residual fluid collector, a vacuum pump, and a connector according to any one of claims 1 to 3; the repair liquid is stored in the repair liquid storage bottle, and the pressurized gas cylinder is connected with the repair liquid storage bottle; the repair liquid storage bottle is connected with a connector sleeved at the first end of the cable through the first liquid guide pipe, so that the repair liquid is injected between the insulation shielding layer and the aluminum sheath layer of the cable; the connector sleeved at the second end of the cable is connected with the residual liquid collector, and the residual liquid collector is connected with the vacuum pump.
5. The device for repairing electrical contact failure in the interior of a high voltage cable according to claim 4, wherein the device further comprises a first control valve disposed at the end of the repair liquid storage bottle; the first control valve is mounted on the first catheter.
6. The device for repairing poor electrical contact inside a high-voltage cable according to claim 4, wherein the device further comprises a second catheter and a second control valve arranged at the end of the pressurizing gas cylinder; the pressurized gas cylinder is connected with the restoration liquid storage bottle through the second liquid guide pipe, and the second control valve is installed on the second liquid guide pipe.
7. The apparatus for repairing poor electrical contact inside a high voltage cable according to claim 4, wherein the apparatus further comprises a third liquid guiding tube and a third control valve disposed at the residual liquid collecting end; the connector sleeved at the second end of the cable is connected with the residual liquid collector through the third liquid guide pipe, and the third control valve is installed on the third liquid guide pipe.
8. The device for repairing poor electrical contact inside a high-voltage cable according to claim 4, wherein the device further comprises a fourth catheter and a fourth control valve disposed at the vacuum pump end; the residual liquid collector is connected with the vacuum pump through the fourth liquid guide pipe, and the fourth control valve is arranged on the fourth liquid guide pipe.
9. The device for repairing poor electrical contact inside a high-voltage cable according to claim 4, wherein the pressurized gas cylinder is a high-pressure nitrogen cylinder or a compressed air pump.
10. The apparatus for repairing electrical contact failure in an interior of a high voltage cable according to claim 4, wherein the repair liquid is made of a conductive liquid material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002251.5A CN112202012B (en) | 2020-09-22 | 2020-09-22 | Connector and repair device for bad electrical contact inside high-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011002251.5A CN112202012B (en) | 2020-09-22 | 2020-09-22 | Connector and repair device for bad electrical contact inside high-voltage cable |
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| CN112881785B (en) * | 2021-01-18 | 2022-08-30 | 国网天津市电力公司电力科学研究院 | Cable buffer layer repairing effect evaluation method based on capacitance current analysis |
| CN114142387A (en) * | 2021-11-12 | 2022-03-04 | 国网湖南省电力有限公司 | Buffer layer repairing method and system of high-voltage cable and application method of buffer layer repairing system |
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| CN109768509B (en) * | 2019-03-21 | 2024-03-22 | 四川大学 | Elbow type joint special for electrified repair of power cable, repair device and method |
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