CN114300181A - Underground fireproof cable with self-checking and repairing capabilities - Google Patents
Underground fireproof cable with self-checking and repairing capabilities Download PDFInfo
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- CN114300181A CN114300181A CN202111648876.3A CN202111648876A CN114300181A CN 114300181 A CN114300181 A CN 114300181A CN 202111648876 A CN202111648876 A CN 202111648876A CN 114300181 A CN114300181 A CN 114300181A
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Abstract
The invention discloses an underground fireproof cable with self-repairing capability, which comprises a cable body and a protective outer layer arranged on the outer surface of the cable body, wherein the protective outer layer comprises a conductive convex ring and an insulating convex ring which are alternately sleeved on the outer surface of the cable body at intervals; the outer diameter of the insulating convex ring is larger than that of the conductive convex ring; the protective outer layer also comprises an outer layer insulating layer; the outer insulating layer is sleeved outside the cable body and supported by the insulating convex ring; the outer insulating layer and the plurality of insulating convex rings form a plurality of sealed cavities in a surrounding manner; the conductive convex ring extends into the cavity, and electrorheological fluid is filled in the cavity; a conductive layer or a conductive wire is arranged on the inner surface of the outer insulating layer; can strengthen the protection to the electric leakage accident, can the automatic monitoring electric leakage condition simultaneously to can make the staff quick learn the electric leakage position roughly, show the security that has improved underground cable, life-span and maintenance ability.
Description
Technical Field
The invention relates to the technical field of cable production, in particular to an underground fireproof cable with self-overhauling capacity.
Background
A cable is an electric energy or signal transmission device, generally a rope-like cable formed by twisting several or several groups of conductors (at least two in each group), each group of conductors being insulated from each other, and being entirely covered with a highly insulating covering, and having characteristics of internal electrical conduction and external insulation, and being used as a conductor for transmitting electric power or information from one place to another.
The existing urban cable is usually pre-buried underground, the underground environment is severe, the moisture is large, the ground conditions are complex and changeable, and the power transmission burden is large, so that the underground cable is easy to age and generate electric leakage accidents, and the underground cable is located underground and difficult to frequently overhaul, so that the accidents are difficult to find in time, and the large economic loss is easy to cause.
Disclosure of Invention
The invention provides an underground fireproof cable with self-checking and repairing capabilities, which can strengthen the protection of electric leakage accidents, can automatically monitor the electric leakage condition, can enable workers to quickly know the general position of electric leakage, and obviously improves the safety, service life and maintenance capabilities of the underground cable.
In order to achieve the purpose, the invention provides the following technical scheme:
an underground fireproof cable with self-repairing capability comprises a cable body and a protective outer layer arranged on the outer surface of the cable body, wherein the protective outer layer comprises a conductive convex ring and an insulating convex ring which are alternately sleeved on the outer surface of the cable body at intervals; the outer diameter of the insulating convex ring is larger than that of the conductive convex ring; the protective outer layer also comprises an outer layer insulating layer; the outer insulating layer is sleeved outside the cable body and supported by the insulating convex ring; the outer insulating layer and the plurality of insulating convex rings form a plurality of sealed cavities in a surrounding manner; the conductive convex ring extends into the cavity, and electrorheological fluid is filled in the cavity; a conductive layer or a conductive wire is arranged on the inner surface of the outer insulating layer; the conductive layer or wire is grounded and passed through a current or electric field monitoring device before being grounded.
Preferably, the cable body includes interior wire mesh layer, interior wire mesh layer internally mounted has the interior insulating rubber layer, interior insulating rubber layer internally mounted has the cross isolated layer, cross isolated layer inside packing has the filling layer, the high fire-retardant layer is installed to the inside equidistance of filling layer, high fire-retardant layer internally mounted has the cable core, the parcel of the cable core outside has the fire-resistant insulation layer, the anti-interference stratum reticulare has been cup jointed to the high fire-resistant layer outside, flexible metal pipe has been cup jointed in the interior wire mesh layer outside, flexible metal pipe outside cup jointed outer wire mesh layer, flexible metal pipe respectively with interior wire mesh layer and outer wire mesh layer between pack have interior fire-resistant insulation layer and outer fire-resistant insulation layer.
Preferably, the cable core is formed by twisting a plurality of copper core insulated wires, and the fire-resistant insulating layer is positioned between the cable core and the high fire-resistant layer.
Preferably, the anti-interference net layer is located between the high flame-retardant layer and the filling layer, and the filling layer is in contact with the high flame-retardant layer through the anti-interference net layer.
Preferably, a gap is formed between the flexible metal pipe and the inner steel wire mesh layer and between the flexible metal pipe and the outer steel wire mesh layer, and the inner fireproof insulating layer and the outer fireproof insulating layer are respectively in contact with the inner insulating rubber layer and the outer insulating rubber layer through the inner steel wire mesh layer and the outer steel wire mesh layer.
Preferably, an outer insulating rubber layer is sleeved on the outer side of the outer steel wire mesh layer, a protective layer is sleeved on the outer side of the outer insulating rubber layer, an anticorrosion insulating pipe is sleeved on the outer side of the protective layer, and a fireproof coating layer is bonded between the anticorrosion insulating pipe and the protective layer.
Preferably, the inner diameter of the protective layer is equal to the outer diameter of the outer insulating rubber layer, and the inner diameter of the anti-corrosion insulating pipe is larger than the outer diameter of the protective layer.
Preferably, the preparation method of the protective outer layer comprises the following steps:
firstly, alternately sleeving a conductive convex ring and an insulating convex ring on the outer circumferential surface of a cable body along the length direction of the cable body; the conductive convex ring is sleeved outside the cable body through a bending forming hoop, the insulating convex ring is formed in a pulse extrusion mode through an improved first cable extrusion machine, a rapid cooling area is arranged at the outlet of the first cable extrusion machine, and the insulating convex ring is ensured to be solidified and formed while being extruded into the insulating convex ring;
filling a groove formed between two adjacent insulating convex rings with electrorheological fluid, arranging a quick-freezing area at the outlet of a second cable extruding machine by using an improved second cable extruding machine, and ensuring the electrorheological fluid to be solidified while extruding the electrorheological fluid from the outlet of the second cable extruding machine and filling the groove;
thirdly, laying a conducting layer or a conducting wire along the length direction of the cable body;
fourthly, extruding the outer insulating layer by using a third cable extruding machine; the inner surface of the outer insulating layer is attached to and supported on the insulating convex ring, and the cavity is enclosed by the insulating convex ring and the outer surface of the cable body; and filling the cavity after the electrorheological fluid is melted.
The self-repairing method of the protective outer layer comprises the following steps:
under normal conditions, electrorheological fluid exists in the protective outer layer to control the temperature and dissipate heat of the cable body;
when the cable body leaks electricity outwards due to aging or defects and the like, the current at the leaking part is conducted to the corresponding conductive convex ring, so that a strong electric field is formed between the conductive convex ring and the conductive layer or the conductive wire; the electrorheological fluid is instantly solidified under the action of a strong electric field, so that the leakage of the electric field is locally locked; at the moment, the current or electric field monitoring device sends out a cable leakage alarm;
thirdly, in order to obtain the general leakage position, since the volume of the electrorheological fluid is increased after being solidified, a bulge can be formed and can be obtained by visual observation; or through extrusion, the electrorheological fluid is hard after being cured and can be known according to different hardness; or through ultrasonic wave or electromagnetic wave detection judgement, ultrasonic wave or electromagnetic wave detect can follow underground cable length direction and survey in proper order, also can be surveyed to the other end transmission ultrasonic wave or electromagnetic wave by the protection skin of underground cable one end, ultrasonic wave or electromagnetic wave are along the outer transmission of protection, because the solidification of electrorheological fluids of electric leakage department, can the reflection effect be bigger, through calculating the time difference of transmission and receipt unusual reflection wave, just can calculate the distance of unusual reflection department to learn the position of unusual reflection department, can learn the electric leakage position.
Compared with the prior art, the invention has the beneficial effects that: the invention has scientific and reasonable structure and safe and convenient use:
1. the protective outer layer can strengthen the protection against electric leakage accidents, can automatically monitor the electric leakage condition, can enable workers to quickly know the general position of electric leakage, and obviously improves the safety, service life and maintenance capability of the underground cable.
2. The protective outer layer of the invention utilizes the characteristics of electrorheological fluid, not only can balance the heat of the underground cable under normal conditions and cool the cable, but also can prevent the resistance of the cable conductor from rising due to the rise of temperature and ensure the stability of current transmission; on the other hand, the temperature is kept constant, so that the aging of various materials of the cable can be effectively reduced, and the service life of the cable is prolonged; when the cable has an electric leakage condition, the electrorheological fluid can be solidified by forming a strong electric field, so that the position of the electric leakage position is locked, an alarm is synchronously issued to enable a worker to know electric leakage information, and the worker can conveniently and accurately find out the general position of the electric leakage for maintenance; the safety of the underground cable and the efficiency of solving the electric leakage accident can be greatly improved.
3. The protective outer layer can be independently connected with the cable body, namely, the protective outer layer can be obtained by carrying out secondary processing on the existing underground cable, so that the protective outer layer can be suitable for the existing cable, can be directly processed on the existing cable, can effectively utilize the existing cable stock, can reduce the equipment requirement and the production cost, has wide applicability, and can even be used for the reconstruction of the existing cable, particularly the reconstruction of an easily-aged electricity leakage section.
4. The cable body can effectively solve the problems that vortex is easy to generate between cable cores, energy loss is increased, high-temperature heat is generated to influence the use of the cable, and the cable is easy to break and damage due to extrusion deformation of an external object.
5. The cable body is provided with the inner insulating rubber layer, the cross isolation layer, the filling layer and the high flame retardant layer, electromagnetism between cable cores is absorbed and isolated through the cross isolation layer, so that eddy currents are difficult to generate between the cable cores, energy loss is reduced, high-temperature heat is prevented from influencing the use of the cable, electromagnetic interference of the outside on the cable can be shielded through the anti-interference net layer, and the cable runs stably.
6. The cable body is provided with the flexible metal pipe, the outer steel wire mesh layer, the inner fireproof insulating layer and the outer fireproof insulating layer, the compression resistance of the cable can be enhanced through the matching of the flexible metal pipe, the outer steel wire mesh layer, the inner fireproof insulating layer and the outer fireproof insulating layer, the cable is prevented from being broken and damaged due to the extrusion deformation of an external object, and the cable has certain flexibility and mechanical strength, so that the cable can adapt to more working environments.
7. The cable body is provided with the outer insulating rubber layer, the protective layer, the fireproof coating layer and the anti-corrosion insulating pipe, so that the cable is not easy to damage and the corrosion of the outside to the cable is reduced through the fireproof coating layer and the anti-corrosion insulating pipe, and the service life of the cable is longer.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the fireproof coating layer of the present invention;
FIG. 3 is a cross-sectional view of the present invention;
figure 4 is a schematic structural view of a cable core of the present invention;
reference numbers in the figures: 1. an inner wire mesh layer; 2. an inner insulating rubber layer; 3. a cross insulating layer; 4. a filling layer; 5. a high flame retardant layer; 6. a cable core; 7. a refractory insulating layer; 8. a flexible metal tube; 9. an outer wire mesh layer; 10. an inner fire-resistant insulating layer; 11. an outer fire-resistant insulating layer; 12. an outer insulating rubber layer; 13. a protective layer; 14. a fire retardant coating layer; 15. an anticorrosive insulating pipe; 16. an anti-interference net layer; 17. a conductive convex ring; 18. an insulating convex ring; 19. an outer insulating layer; 20. a cavity; 22. a conductive layer or a conductive line.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example (b): as shown in fig. 1-4, the present invention provides a technical solution, an underground fireproof cable with self-repairing capability, including a cable body and a protective outer layer disposed on an outer surface of the cable body, where the protective outer layer includes a conductive convex ring 17 and an insulating convex ring 18 alternately sleeved on the outer surface of the cable body at intervals; the outer diameter of the insulating convex ring 18 is larger than that of the conductive convex ring 17; the protective outer layer further comprises an outer layer insulating layer 19; the outer insulating layer 19 is sleeved outside the cable body and supported by the insulating convex ring 18; the outer insulating layer 19 and the insulating convex rings 18 enclose a plurality of sealed cavities 20; the conductive convex ring 17 extends into the cavity 20, and electrorheological fluid is filled in the cavity 20; the inner surface of the outer insulating layer 19 is provided with a conductive layer or a conductive wire 22; the conductive layer or wire 22 is grounded and passed through a current or electric field monitoring device prior to grounding.
The cable body comprises an inner steel wire mesh layer 1, an inner insulating rubber layer 2 is arranged inside the inner steel wire mesh layer 1, a cross isolation layer 3 is arranged inside the inner insulating rubber layer 2, a filling layer 4 is filled inside the cross isolation layer 3, high flame retardant layers 5 are arranged inside the filling layer 4 at equal intervals, a cable core 6 is arranged inside the high flame retardant layers 5, a fire-resistant insulating layer 7 is wrapped outside the cable core 6, an anti-interference mesh layer 16 is sleeved outside the high flame retardant layers 5, a flexible metal pipe 8 is sleeved outside the inner steel wire mesh layer 1, an outer steel wire mesh layer 9 is sleeved outside the flexible metal pipe 8, an inner fire-resistant insulating layer 10 and an outer fire-resistant insulating layer 11 are respectively filled between the flexible metal pipe 8 and the inner steel wire mesh layer 1 and the outer steel wire mesh layer 9, the cable core 6 is formed by stranding a plurality of copper core insulating wires, and the fire-resistant insulating layer 7 is positioned between the cable core 6 and the high flame retardant layers 5, the cross isolation layer 3 is used for absorbing and isolating electromagnetism between the cable cores 6, so that eddy currents are difficult to generate between the cable cores 6, energy loss is reduced, high-temperature heat is prevented from affecting the use of the cable, electromagnetic interference to the cable from the outside can be shielded through the anti-interference net layer 16, and the cable is stable in operation.
The anti-interference net layer 16 is located between the high flame-retardant layer 5 and the filling layer 4, the filling layer 4 is in contact with the high flame-retardant layer 5 through the anti-interference net layer 16, gaps are formed between the flexible metal pipe 8 and the inner steel wire net layer 1 and between the flexible metal pipe 8 and the outer steel wire net layer 9, the inner fireproof insulating layer 10 and the outer fireproof insulating layer 11 are in contact with the inner insulating rubber layer 2 and the outer insulating rubber layer 12 through the inner steel wire net layer 1 and the outer steel wire net layer 9 respectively, the compressive capacity of the cable can be enhanced through the cooperation of the flexible metal pipe 8, the outer steel wire net layer 9, the inner fireproof insulating layer 10 and the outer fireproof insulating layer 11, the cable is prevented from being broken and damaged due to extrusion deformation of an external object, certain flexibility and mechanical strength are achieved, and the cable can adapt to more working environments.
Outer wire mesh layer 9 outside has cup jointed outer insulating rubber layer 12, protective layer 13 has been cup jointed in the outer insulating rubber layer 12 outside, anticorrosive insulating tube 15 has been cup jointed in the protective layer 13 outside, it has fire prevention coating layer 14 to bond between anticorrosive insulating tube 15 and the protective layer 13, protective layer 13 internal diameter equals with outer insulating rubber layer 12 external diameter, 15 internal diameters of anticorrosive insulating tube are bigger than protective layer 13 external diameter, make the cable not fragile and reduced external corruption to the cable through fire prevention coating layer 14 and anticorrosive insulating tube 15, make the life of cable longer.
The preparation method of the protective outer layer comprises the following steps:
firstly, alternately sleeving a conductive convex ring 17 and an insulating convex ring 18 on the outer circumferential surface of the cable body along the length direction of the cable body; the conductive convex ring 17 is sleeved outside the cable body through a bending forming hoop, the insulating convex ring 18 is formed in a pulse extrusion mode through a modified first cable extrusion machine, a rapid cooling area is arranged at the outlet of the first cable extrusion machine, and the solidification forming of the insulating convex ring 18 is ensured while the insulating convex ring is extruded;
filling electrorheological fluid in a groove formed between two adjacent insulating convex rings 18, setting a quick-freezing area at the outlet of a second cable extruding machine by using an improved second cable extruding machine, and ensuring the electrorheological fluid to be solidified while extruding the electrorheological fluid from the outlet of the second cable extruding machine and filling the groove;
thirdly, laying a conducting layer or a conducting wire 22 along the length direction of the cable body;
fourthly, the outer insulating layer 19 is extruded by a third cable extruding machine; the inner surface of the outer layer insulating layer 19 is attached to and supported on the insulating convex ring 18, and encloses the cavity 20 with the insulating convex ring 18 and the outer surface of the cable body; the cavity 20 is filled after the electro-rheological fluid has melted.
The self-repairing method of the protective outer layer comprises the following steps:
under normal conditions, electrorheological fluid exists in the protective outer layer to control the temperature and dissipate heat of the cable body;
secondly, when the cable body leaks electricity outwards due to aging or defects and the like, the current at the leaking part is conducted to the corresponding conductive convex ring 17, so that a strong electric field is formed between the conductive convex ring 17 and the conductive layer or the conductive wire 22; the electrorheological fluid is instantly solidified under the action of a strong electric field, so that the leakage of the electric field is locally locked; at the moment, the current or electric field monitoring device sends out a cable leakage alarm;
thirdly, in order to obtain the general leakage position, since the volume of the electrorheological fluid is increased after being solidified, a bulge can be formed and can be obtained by visual observation; or through extrusion, the electrorheological fluid is hard after being cured and can be known according to different hardness; or through ultrasonic wave or electromagnetic wave detection judgement, ultrasonic wave or electromagnetic wave detect can follow underground cable length direction and survey in proper order, also can be surveyed to the other end transmission ultrasonic wave or electromagnetic wave by the protection skin of underground cable one end, ultrasonic wave or electromagnetic wave are along the outer transmission of protection, because the solidification of electrorheological fluids of electric leakage department, can the reflection effect be bigger, through calculating the time difference of transmission and receipt unusual reflection wave, just can calculate the distance of unusual reflection department to learn the position of unusual reflection department, can learn the electric leakage position.
The working principle of the cable body is as follows:
the filler of filling layer 4 is fire-retardant mineral compound, the material of high fire-retardant layer 5 is halogen-free polyolefin material, the wrapping material of fire-resistant insulating layer 7 is fire-resistant mica tape, cross insulating layer 3 is soft magnetic ferrite, the material of anti-interference stratum reticulare 16 is anti-interference copper mesh, interior insulating rubber layer 2 and outer insulating rubber layer 12 are the insulating rubber section of thick bamboo, it is isolated to absorb the electromagnetism between the cable core 6 through cross insulating layer 3, make and be difficult to produce the vortex between the cable core 6, the loss of energy has been reduced and the use that prevents to produce high temperature heat and influence the cable, can shield the external electromagnetic interference to the cable through anti-interference stratum reticulare 16, make the cable operation stable.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides an underground fireproof cable with self-checking ability which characterized in that: the cable comprises a cable body and a protective outer layer arranged on the outer surface of the cable body, wherein the protective outer layer comprises conductive convex rings (17) and insulating convex rings (18) which are alternately sleeved on the outer surface of the cable body at intervals; the outer diameter of the insulating convex ring (18) is larger than that of the conductive convex ring (17); the protective outer layer further comprises an outer insulating layer (19); the outer insulating layer (19) is sleeved outside the cable body and is supported by the insulating convex ring (18); the outer insulating layer (19) and a plurality of insulating convex rings (18) enclose a plurality of sealed cavities (20); the conductive convex ring (17) extends into the cavity (20), and electrorheological fluid is filled in the cavity (20); the inner surface of the outer insulating layer (19) is provided with a conductive layer or a conductive wire (22); the conductive layer or wire (22) is grounded and passed through a current or electric field monitoring device prior to grounding.
2. An underground fireproof cable with self-repairing capability according to claim 1, wherein the cable body comprises an inner steel mesh layer (1); an inner insulating rubber layer (2) is arranged in the inner steel wire mesh layer (1), a cross isolation layer (3) is arranged in the inner insulating rubber layer (2), the cross-shaped isolation layer (3) is filled with a filling layer (4), the filling layer (4) is internally provided with high flame-retardant layers (5) at equal intervals, a cable core (6) is arranged in the high flame-retardant layer (5), a fire-resistant insulating layer (7) is wrapped on the outer side of the cable core (6), an anti-interference mesh layer (16) is sleeved on the outer side of the high flame-retardant layer (5), a flexible metal pipe (8) is sleeved on the outer side of the inner steel wire mesh layer (1), an outer steel wire mesh layer (9) is sleeved on the outer side of the flexible metal pipe (8), and an inner fireproof insulating layer (10) and an outer fireproof insulating layer (11) are filled between the flexible metal pipe (8) and the inner steel wire mesh layer (1) and between the flexible metal pipe and the outer steel wire mesh layer (9) respectively.
3. An underground fireproof cable with self-repairing capability according to claim 2, wherein the cable core (6) is formed by twisting a plurality of copper core insulated wires, and the fire-resistant insulating layer (7) is located between the cable core (6) and the high fire-resistant layer (5).
4. An underground fireproof cable with self-repairing capability according to claim 2, wherein the anti-interference mesh layer (16) is located between the high flame retardant layer (5) and the filling layer (4), and the filling layer (4) is in contact with the high flame retardant layer (5) through the anti-interference mesh layer (16).
5. An underground fireproof cable with self-repairing capability according to claim 2, wherein there is a gap between the flexible metal tube (8) and the inner steel wire mesh layer (1) and the outer steel wire mesh layer (9), and the inner fireproof insulating layer (10) and the outer fireproof insulating layer (11) are in contact with the inner insulating rubber layer (2) and the outer insulating rubber layer (12) through the inner steel wire mesh layer (1) and the outer steel wire mesh layer (9), respectively.
6. An underground fireproof cable with self-repairing capability according to claim 2, wherein an outer insulating rubber layer (12) is sleeved outside the outer steel wire mesh layer (9), a protective layer (13) is sleeved outside the outer insulating rubber layer (12), an anticorrosion insulating pipe (15) is sleeved outside the protective layer (13), and a fireproof paint layer (14) is bonded between the anticorrosion insulating pipe (15) and the protective layer (13).
7. An underground fireproof cable with self-repairing capability according to claim 6, wherein the inner diameter of the protective layer (13) is equal to the outer diameter of the outer insulating rubber layer (12), and the inner diameter of the corrosion-resistant insulating pipe (15) is larger than the outer diameter of the protective layer (13).
8. An underground fireproof cable with self-repairing capability according to claim 1, wherein the preparation method of the protective outer layer comprises:
firstly, a conductive convex ring (17) and an insulating convex ring (18) are alternately sleeved on the outer circumferential surface of the cable body along the length direction of the cable body; the conductive convex ring (17) is sleeved outside the cable body through a bending forming hoop, the insulating convex ring (18) is formed in a pulse extrusion mode through a first improved cable extruder, a rapid cooling area is arranged at the outlet of the first cable extruder, and the solidification forming of the insulating convex ring (18) is ensured while the insulating convex ring is extruded;
filling electrorheological fluid in a groove formed between two adjacent insulating convex rings (18), setting a quick-freezing area at the outlet of a second cable extruding machine by using an improved second cable extruding machine, and ensuring the electrorheological fluid to be solidified while extruding the electrorheological fluid from the outlet of the second cable extruding machine and filling the groove;
thirdly, laying a conducting layer or a conducting wire (22) along the length direction of the cable body;
fourthly, the outer insulating layer (19) is extruded by a third cable extruding machine; the inner surface of the outer layer insulating layer (19) is attached to and supported on the insulating convex ring (18), and the cavity (20) is enclosed by the insulating convex ring (18) and the outer surface of the cable body; filling the cavity (20) after the electrorheological fluid melts.
9. An underground fireproof cable with self-repairing capability according to claim 1, wherein the self-repairing method of the protective outer layer is as follows:
under normal conditions, electrorheological fluid exists in the protective outer layer to control the temperature and dissipate heat of the cable body;
secondly, when the cable body leaks electricity outwards due to aging or defects and the like, the current at the leaking part is conducted to the corresponding conductive convex ring (17) so that a strong electric field is formed between the conductive convex ring (17) and the conductive layer or the conductive wire (22); the electrorheological fluid is instantly solidified under the action of a strong electric field, so that the leakage of the electric field is locally locked; at the moment, the current or electric field monitoring device sends out a cable leakage alarm;
thirdly, in order to obtain the general leakage position, since the volume of the electrorheological fluid is increased after being solidified, a bulge can be formed and can be obtained by visual observation; or through extrusion, the electrorheological fluid is hard after being cured and can be known according to different hardness; or through ultrasonic wave or electromagnetic wave detection judgement, ultrasonic wave or electromagnetic wave detect can follow underground cable length direction and survey in proper order, also can be surveyed to the other end transmission ultrasonic wave or electromagnetic wave by the protection skin of underground cable one end, ultrasonic wave or electromagnetic wave are along the outer transmission of protection, because the solidification of electrorheological fluids of electric leakage department, can the reflection effect be bigger, through calculating the time difference of transmission and receipt unusual reflection wave, just can calculate the distance of unusual reflection department to learn the position of unusual reflection department, can learn the electric leakage position.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108053939A (en) * | 2017-12-26 | 2018-05-18 | 奥博电气有限公司 | Bus cable |
| CN108445363A (en) * | 2018-04-18 | 2018-08-24 | 国家电网公司 | A kind of city net cable insulation defect inspection method based on fringe field |
| CN211879107U (en) * | 2020-05-12 | 2020-11-06 | 湖北熠能电力工程有限公司 | Cable with automatic detection and protection functions |
| CN213275921U (en) * | 2020-09-23 | 2021-05-25 | 山东网鑫电气有限公司 | High-voltage cable outer sheath insulation live detection device |
| CN113053587A (en) * | 2021-03-17 | 2021-06-29 | 福建礼恩科技有限公司 | Preparation method of fireproof cable |
-
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- 2021-12-29 CN CN202111648876.3A patent/CN114300181A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108053939A (en) * | 2017-12-26 | 2018-05-18 | 奥博电气有限公司 | Bus cable |
| CN108445363A (en) * | 2018-04-18 | 2018-08-24 | 国家电网公司 | A kind of city net cable insulation defect inspection method based on fringe field |
| CN211879107U (en) * | 2020-05-12 | 2020-11-06 | 湖北熠能电力工程有限公司 | Cable with automatic detection and protection functions |
| CN213275921U (en) * | 2020-09-23 | 2021-05-25 | 山东网鑫电气有限公司 | High-voltage cable outer sheath insulation live detection device |
| CN113053587A (en) * | 2021-03-17 | 2021-06-29 | 福建礼恩科技有限公司 | Preparation method of fireproof cable |
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