CN110601097A - Universal repair method for cable damage - Google Patents
Universal repair method for cable damage Download PDFInfo
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- CN110601097A CN110601097A CN201910892690.9A CN201910892690A CN110601097A CN 110601097 A CN110601097 A CN 110601097A CN 201910892690 A CN201910892690 A CN 201910892690A CN 110601097 A CN110601097 A CN 110601097A
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- cable
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- sheath
- injection molding
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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Abstract
The invention discloses a universal repair method for cable damage, which mainly comprises the following steps: removing the insulation damage section: forming a circular insulation repair gap to obtain a cable with an insulation damage section removed; selection of an insulating layer repairing mold: the diameter of the circular through hole of the die is equal to that of the insulating layer, and the length of the circular through hole is larger than that of the insulating damage section; repairing the insulating layer: placing the cable in an insulation layer repairing mould, and enabling the center of the insulation damage section to coincide with the center of the middle section through hole of the mould; and opening a mold temperature machine and an injection molding machine to carry out injection molding on the insulation repair gap to obtain the repaired cable. The method can realize the repair of insulation damage of various cables; the repair material can reach the small and island-shaped defect part, the repair material and the existing insulating layer of the cable are fully melted, the combination is good, the thickness of the repair layer is consistent and uniform, and the repair quality is good.
Description
Technical Field
The invention relates to a method for repairing damaged cables.
Background
The cable is composed of an electric conductor, an insulating layer or an electric conductor, an insulating layer and a sheath layer, and is a basic element for transmitting electric power. When the cable is damaged to cause insulation failure, the safety and reliability of power transmission are affected. When the cable has a long service life as a whole and is damaged locally to cause local insulation failure, the cable is replaced entirely, which results in unnecessary increase of power transmission cost. It is usually repaired and then used.
There are three main situations of cable local damage: one is 'water tree' damage failure, the cable is in service in a humid environment, the surface or interface of an electric conductor of the cable has defects or impurities, and water is gathered under the action of an electric field, so that the insulating layer and the sheath layer of the cable generate 'tree trunk type' damage, and the insulation resistance of the damaged part of the cable is obviously reduced. The second type is 'electric tree' damage, the cable is in service in a dry environment, the local parts of the insulating layer and the sheath layer are uneven or are interfered by the outside world, high electromagnetic impact is generated, the material generates an electric corrosion phenomenon, polarization, fatigue and heat effect are shown, rapid aging is realized, trunk type damage of the insulating layer and the sheath layer is formed, and then the local insulation failure of the cable is caused. The third is 'mechanical damage', the cable is in service in a dry environment, and the insulating layer of the cable is subjected to the action of mechanical external force in use to generate local mechanical damage, so that the local insulation of the cable fails.
For repairing the damage of the cable 'water tree', the current method mainly adopts a 'liquid injection repairing' method. Under invisible conditions, opening a liquid injection port on an insulation failure part, and injecting repairing liquids such as a silicone resin solution, a titanate solution and the like into a cable insulation layer and a sheath layer; repairing liquid andthe compounds (impurities) in the water tree damage react to generate stable SiO with good insulation2”、“TiO2"and the like. However, the repair is performed under an unobservable condition, so that the thickness and uniformity of the repaired insulating layer are difficult to control, and the insulation performance after repair is difficult to ensure.
The local insulation failure caused by the damage of the cable 'electricity tree' belongs to the local aging problem of the insulating layer and the sheath layer. 201710016759 the method for repairing Chinese patent is: in the preparation process of the materials of the insulating layer and the sheath layer, 0.02 wt% -0.05 wt% of Grubbs catalyst is added in advance; when the cable has local insulation failure, a repairing agent (urea-formaldehyde resin coated dicyclopentadiene nanometer microcapsule) is injected into the insulation failure part, so that the repairing agent and Grubbs catalysts in the cable insulation layer and the sheath layer material are subjected to chemical reaction, the cable insulation strength is recovered, and the cable is repaired. However, this method is effective only when the cable is damaged in the initial stage of insulation failure and cracks of trunk-type damage are slight. And when the cracks caused by trunk type damage are large in the middle and later periods of the electric tree damage, the reaction product of 0.02 wt% -0.05 wt% of Grubbs catalyst and the repairing agent is not enough to fill the cracks caused by the trunk type damage, and the method is not effective.
There are two main methods for repairing the mechanical damage of the cable: one is simply to wrap the tape around the damaged area of the machine, which is not firmly and reliably repaired and is only a temporary treatment. The other type is a 'filling repairing method', the repairing device comprises a rack and a lower die holder fixed on the rack, the lower die holder is connected with an upper die holder through a rotating shaft, semicircular grooves of the upper die holder and the lower die holder oppositely form a cable repairing hole, a heating ring formed by an electric heating rod is arranged on the hole wall of the cable repairing hole, a melting furnace is arranged at the top of the upper die holder, the melting furnace is communicated with the upper part of the cable repairing hole through a plastic melting cavity in the heating ring at the upper part and a liquid outlet hole of the plastic melting cavity, and a circular arc-shaped telescopic clamping claw penetrating through the heating ring is. When repairing, the upper die base is opened around the rotating shaft, the cable to be repaired is placed on the arc-shaped cable frame of the cable repairing hole, the upper die base is closed around the rotating shaft, the arc-shaped clamping claw rises, and the cable to be repaired is tightly abutted to the heating ring at the upper part; the melted repairing material in the melting furnace is uniformly coated on the surface layer of the upper repairing area of the cable to be repaired through the plastic melting cavity on the upper part and the liquid outlet hole of the plastic melting cavity, so that the repairing of the mechanically damaged insulation failure cable is realized. The device has a complex structure, when the damaged part is obviously larger than the distribution range (radian) of the liquid outlet, the damaged part can not be repaired at one time, and needs to be realigned to carry out two or more repair operations, so the operation is troublesome and the repair cost is high. When the area of the continuous loss part of the cable is large and deep, the lifting distance of the clamping claw is large, the repairing filling space is small, the repairing thickness of the cable is reduced, and the repairing quality is poor.
In summary, there are three reasons for insulation failure, and the existing repair method adopts different methods according to different types (reasons) of cable insulation failure, and cannot adopt one method to repair three insulation failure types uniformly; and each repair method has the defect which is difficult to overcome.
Disclosure of Invention
The invention aims to provide a universal repair method for cable damage, which can realize the repair of various cable insulation damages; the repair material can reach any defective part, the repair material and the existing insulating layer of the cable are fully melted, the combination is good, the thickness of the repair layer is consistent and uniform, and the repair quality is good.
The first technical scheme adopted by the invention for realizing the aim is a universal repair method for the damage of the cable, wherein the cable consists of a conductor at the center and an insulating layer outside the conductor; the general repairing method comprises the following steps:
A. removal of damaged sections of insulation
Measuring the central position and the length of an insulation damage section of the cable at which an insulation damage part is located by using a leakage detector, marking the central position as a repair center of the cable, and removing the insulation damage section to form an insulation repair gap to obtain the cable with the insulation damage section removed;
B. selection of insulating layer repairing mould
Selecting an insulating layer repairing die consisting of an upper die holder and a lower die holder, wherein a circular through hole is formed between the upper die holder and the lower die holder; the diameter of the round through hole is equal to that of the insulating layer, the length of the round through hole is larger than that of the insulating damage section, and the upper die base and the lower die base are both provided with heat preservation pipelines; the upper die holder is also provided with an insulating layer injection molding small hole, the lower end of the insulating layer injection molding small hole is communicated with the circular through hole, and the insulating layer injection molding small hole is positioned right above the circular through hole;
C. repair of insulating layers
Moving the upper die base away, placing the cable with the insulation damage section removed, which is obtained in the step A, on the lower die base, covering the upper die base, and enabling the repair center of the cable to be superposed with the center of the through hole in the middle section of the insulation layer repair die; at the moment, the free space between the circular through hole and the cable is an insulation repair gap of the cable;
connecting the heat preservation pipeline with a mold temperature controller, starting the mold temperature controller, raising the temperature of the insulating layer repairing mold to the melting temperature of the insulating layer repairing material, and preserving heat;
connecting the upper end of the injection molding small hole of the insulating layer with an injection molding pipe of an injection molding machine, immediately starting the injection molding machine, and injecting and filling the molten insulating layer repair material into the insulation repair gap of the cable through the injection molding pipe and the injection molding small hole of the insulating layer; and then closing the mold temperature machine and the injection molding machine, removing the upper mold base after the injected insulating layer repairing material is cooled to room temperature, and taking out the cable to obtain the repaired cable.
The technical scheme is suitable for repairing the cable insulation damage without the sheath layer.
Compared with the prior art, the first technical scheme of the invention has the beneficial effects that:
firstly, no matter the damage of a water tree, an electric tree or a mechanical tree is caused, the depth, the density and the shape of a damage point (crack) are not distinguished, the whole insulation damage section where various insulation damage parts are located is completely removed, and a complete circular insulation layer repair gap with a uniform shape is formed; and then the repair gap is subjected to one-time integral injection repair, so that various types and different degrees of damage are repaired uniformly by one method. Compared with the prior art, aiming at the 'water tree' damage and 'electric tree' damage of small cracks, the method adopts corresponding microscopic chemical infiltration and microscopic repair, and adopts in-situ repair for maintaining the existing wound for mechanical damage.
Secondly, performing one-time integral injection repair on the uniform annular insulation layer repair gap, wherein the repair material can smoothly reach any part of the annular repair gap to fill the whole gap; in the whole process of injecting the repairing material and filling the gap with the repairing material, the temperature of the whole repairing area is always kept constant at the melting point of the repairing material by the mold temperature controller, and the repairing material and the existing insulating layer material are fully fused and firmly combined; the injection molding repair quality is good. The defects that fine or independent cracks cannot be reached by permeation type microscopic repair adopted by the existing damage of the water tree and the electric tree or the repair cannot be realized due to insufficient mass of chemicals added in advance are avoided; the defects that the injection material is difficult to reach and cannot be repaired for small cracks or separated island-type defects caused by in-situ injection repair of the existing wounds due to mechanical damage are also avoided.
The diameter of a circular through hole in the insulating layer repairing mould used in repairing is equal to that of the insulating layer, and the length of the circular through hole is greater than that of the insulating damage section; when the cable is arranged in the circular through hole, the insulating layers on two sides of the circular gap of the cable are tightly matched with the circular through hole to form a support for the cable; the annular repair cavity formed by the free space of the circular through hole is completely consistent with the annular gap of the cable; thereby ensuring that the repaired insulating layers have consistent diameter and thickness and good repairing quality. The defects that in the existing mechanical damage repairing method, when the area of the continuous loss part of the cable is large and deep, the jacking distance of the clamping claw is large, the repairing filling space is small, the repairing thickness of the cable is reduced, and the repairing quality is poor are avoided.
The second technical scheme adopted by the invention for realizing the purpose of the invention is that the cable is a universal repair method for the damage of the cable, wherein the cable consists of a conductor at the center, an insulating layer outside the conductor and a sheath layer outside the insulating layer; the general repairing method comprises the following steps:
a. removal of damaged section and sheath layer
Measuring the central position and the length of an insulation damage section of an insulation damage part of the cable by using a leakage detector, marking the central position as a repair center of the cable, removing a sheath layer outside the insulation damage section, marking the removed sheath layer as a removed sheath section, and removing the insulation damage section to form an insulation repair gap; the length of the removed sheath section is greater than that of the insulation damage section, and the cable with the insulation damage section removed is obtained;
b. selection of repair mold
b1 selection of insulating layer repairing mould
Selecting an insulating layer repairing die consisting of an upper die holder and a lower die holder, wherein a dumbbell-shaped circular through hole is formed between the upper die holder and the lower die holder; the diameter of the middle section through hole of the dumbbell-shaped circular through hole is equal to that of the insulating layer, the length of the middle section through hole is greater than that of the insulating damage section, and the length of the middle section through hole is less than or equal to that of the sheath removing section; the diameter of the through hole at the end part of the dumbbell-shaped circular through hole is more than or equal to that of the sheath layer;
the upper die base and the lower die base are respectively provided with a heat insulation pipeline connected with the die temperature controller; the upper die base is also provided with an insulating layer injection molding small hole, the lower end of the insulating layer injection molding small hole is communicated with the middle section through hole, and the upper end of the insulating layer injection molding small hole is connected with an injection molding pipe of the injection molding machine;
b2 selection of mould for repairing sheath layer
Selecting a sheath layer repairing die consisting of a sheath upper die holder and a sheath lower die holder, wherein a sheath through hole with a large middle and two small ends is formed between the sheath upper die holder and the sheath lower die holder; the diameter of the middle section through hole of the sheath through hole is larger than that of the sheath layer, and the length of the middle section through hole is larger than that of the sheath removing section; the diameter of the through hole at the end part of the round through hole is equal to that of the sheath layer;
the sheath upper die base and the sheath lower die base are respectively provided with a sheath heat-insulating pipeline connected with the die temperature controller; the sheath upper die base is also provided with a sheath injection molding small hole, the lower end of the sheath injection molding small hole is communicated with the middle section through hole, and the upper end of the sheath injection molding small hole is connected with an injection molding pipe of the injection molding machine;
c. repair of insulating layers
Moving the upper die base away, placing the cable with the insulation damage section removed, which is obtained in the step a, on the lower die base, covering the upper die base, and enabling the repair center of the cable to be superposed with the center of the through hole in the middle section of the insulation layer repair die; at the moment, the free space between the through hole in the middle section and the cable is an insulation repair gap of the cable;
connecting the heat preservation pipeline with a mold temperature controller, starting the mold temperature controller, raising the temperature of the insulating layer repairing mold to the melting temperature of the insulating layer repairing material, and preserving heat;
connecting the upper end of the injection molding small hole of the insulating layer with an injection molding pipe of an injection molding machine, immediately starting the injection molding machine, and injecting and filling the molten insulating layer repair material into the insulation repair gap of the cable through the injection molding pipe and the injection molding small hole of the insulating layer; then closing the mold temperature machine and the injection molding machine, removing the upper mold base after the injected insulating layer repairing material is cooled to room temperature, and taking out the cable to obtain the cable with the repaired insulating layer;
d. repair of jacket layer
Moving the upper sheath die holder away, placing the cable with the repaired insulating layer obtained in the step c on the lower sheath die holder, covering the upper sheath die holder with the cable, and enabling the repair center of the cable to coincide with the center of the middle-section through hole of the sheath layer repair die;
connecting the sheath heat-preservation pipeline with a mold temperature controller, starting the mold temperature controller, raising the temperature of the sheath layer repairing mold to the melting temperature of the sheath layer repairing material, and preserving heat;
connecting the upper end of the sheath layer injection molding small hole with an injection molding pipe of an injection molding machine, immediately starting the injection molding machine, and injecting and filling the molten sheath layer repairing material into the middle section through hole of the sheath layer repairing mold through the injection molding pipe and the sheath layer injection molding small hole; and then closing the mold temperature machine and the injection molding machine, removing the upper mold base of the sheath after the injected sheath layer repairing material is cooled to room temperature, and taking out the cable to obtain the repaired cable.
This second technical scheme is applicable to, still have the restoration of the damage of the cable of restrictive coating outside the insulating layer.
Compared with the prior art, the second technical scheme of the invention has the beneficial effects that:
firstly, no matter the damage of a water tree, an electric tree or a mechanical tree is caused, the depth, the density and the shape of a damage point (crack) are not distinguished, the whole insulation damage section where various insulation damage parts are located is completely removed, a complete circular insulation layer repairing gap with a uniform shape is formed, meanwhile, sheath sections on two sides of the insulation damage section are removed, and a circular removal sheath layer is formed; and then, the gaps of the insulation layer are repaired and the sheath layer is removed to perform one-time integral injection repair, so that various types and different degrees of damage are realized, and the unified repair is performed by one method. Compared with the prior art, aiming at the 'water tree' damage and 'electric tree' damage of small cracks, the method adopts corresponding microscopic chemical infiltration and microscopic repair, and adopts in-situ repair for maintaining the existing wound for mechanical damage.
Secondly, performing one-time integral injection repair on the uniform annular insulating layer repair gap and the removed sheath layer, wherein the repair material can smoothly reach and fill any position of the annular repair part; in the whole process of injecting the repairing material and filling the gap with the repairing material, the temperature of the whole repairing area is always kept constant at the melting point of the repairing material by a mold temperature controller, and the repairing material and the existing insulating layer or sheath layer material are fully fused and firmly combined; the injection molding repair quality is good. The defects that fine or independent cracks cannot be reached by permeation type microscopic repair adopted by the existing damage of the water tree and the electric tree or the repair cannot be realized due to insufficient mass of chemicals added in advance are avoided; the defects that the injection material is difficult to reach and cannot be repaired for small cracks or separated island-type defects caused by in-situ injection repair of the existing wounds due to mechanical damage are also avoided.
The diameter of a circular through hole in the insulating layer repairing mould used in repairing is equal to that of the insulating layer, and the length of the circular through hole is greater than that of the insulating damage section; when the cable is arranged in the circular through hole, the insulating layers on two sides of the circular gap of the cable are tightly matched with the circular through hole to form a support for the cable; the annular repair cavity formed by the free space of the circular through hole is completely consistent with the annular gap of the cable; thereby ensuring that the repaired insulating layers have consistent diameter and thickness and good repairing quality. The defects that in the existing mechanical damage repairing method, when the area of the continuous loss part of the cable is large and deep, the jacking distance of the clamping claw is large, the repairing filling space is small, the repairing thickness of the cable is reduced, and the repairing quality is poor are avoided.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural view of a cable before repair according to embodiments 1, 2 of the present invention;
fig. 2 is a schematic structural view of an insulation layer repair mold selected in embodiment 1 of the present invention;
FIG. 3 is a schematic view of a cable insulation repair operation according to example 1 of the present invention;
fig. 4 is a schematic structural view of an insulation layer repair mold selected in embodiment 2 of the present invention;
FIG. 5 is a schematic view of a cable insulation repair operation according to example 2 of the present invention;
FIG. 6 is a schematic structural view of a cable before repair according to embodiment 3 of the present invention;
fig. 7 is a schematic structural view of an insulation-layer repairing mold according to embodiment 3 of the present invention;
FIG. 8 is a schematic view of a cable insulation repair operation according to example 3 of the present invention;
fig. 9 is a schematic structural diagram of a sheath repairing mold according to embodiment 3 of the present invention;
fig. 10 is a schematic view of a cable sheath layer repairing operation according to example 3 of the present invention;
Detailed Description
Example 1
Fig. 1-3 show that a first embodiment of the present invention is: a general repair method for cable damage, the cable 10 is composed of a conductor 11 at the center and an insulating layer 12 outside the conductor 11; the general repairing method comprises the following steps:
A. removal of damaged sections of insulation
Measuring the central position and the length of an insulation damage section 12a where an insulation damage part of the cable 10 is located by using a leakage detector, marking the central position as a repair center 10a of the cable, and removing the insulation damage section 12a to form an insulation repair gap 12a' to obtain the cable 10 with the insulation damage section removed;
B. selection of insulating layer repairing mould
Selecting an insulating layer repairing die consisting of an upper die holder 21 and a lower die holder 22, wherein a circular through hole 23 is formed between the upper die holder 21 and the lower die holder 22; the diameter of the circular through hole 23 is equal to that of the insulating layer 12, the length of the circular through hole is larger than that of the insulating damage section 12a, and the upper die base 21 and the lower die base 22 are both provided with heat insulation pipelines 25; the upper die base 21 is also provided with an insulating layer injection molding small hole 21a, the lower end of the insulating layer injection molding small hole 21a is communicated with the circular through hole 23, and the insulating layer injection molding small hole 21a is positioned right above the circular through hole 23; see figure 2 for details.
C. Repair of insulating layers
The upper die base 21 is moved away, the cable 10 with the insulation damage section removed, which is obtained in the step A, is placed on the lower die base 22, then the upper die base 21 is covered, and the repair center 10a of the cable is superposed with the center of the middle section through hole 23 of the insulation layer repair die; at this time, the free space between the circular through hole 23 and the cable 10 is the insulation repair gap 12a' of the cable;
connecting the heat preservation pipeline 25 with a mold temperature controller 40, starting the mold temperature controller 40, raising the temperature of the insulation layer repairing mold to the melting temperature of the insulation layer repairing material, and preserving the heat;
connecting the upper end of the insulating layer injection molding small hole 21a with an injection molding pipe of an injection molding machine 41, immediately starting the injection molding machine 41, and injecting and filling the insulation repair gap 12a' of the cable with the fused insulating layer repair material through the injection molding pipe and the insulating layer injection molding small hole 21 a; and then closing the mold temperature controller 40 and the injection molding machine 41, removing the upper mold base 21 after the injected insulation layer repairing material is cooled to the room temperature, and taking out the cable 10 to obtain the repaired cable. See figure 3 for details.
The embodiment is suitable for repairing the insulation damage of the cable without the sheath layer.
Example 2
Fig. 1, 4 and 5 show that the second embodiment of the present invention is substantially the same as the method of the first embodiment, except that: two ends of the circular through hole 23 of the selected insulation layer repairing mould are also provided with a large through hole 24 with the diameter larger than that of the insulation layer 12.
Example 3
Fig. 6-10 show that a third embodiment of the present invention is: a general repair method for cable damage, the cable 10 is composed of a conductor 11 in the center, an insulating layer 12 outside the conductor 11, and a sheath layer 13 outside the insulating layer 12; the general repairing method comprises the following steps:
a. removal of damaged section and sheath layer
Measuring the central position and the length of an insulation damage section 12a where an insulation damage part of the cable 10 is located by using a leakage detector, marking the central position as a repair center 10a of the cable, removing a sheath layer 13 outside the insulation damage section 12a, marking the removed sheath layer as a removed sheath section 13a, and removing the insulation damage section 12a to form an insulation repair gap 12 a'; the length of the removed sheath section 13a is greater than that of the insulation damage section 12a, and the cable 10 with the insulation damage section removed is obtained;
b. selection of repair mold
b1 selection of insulating layer repairing mould
Selecting an insulating layer repairing die consisting of an upper die holder 21 and a lower die holder 22, wherein a dumbbell-shaped circular through hole is formed between the upper die holder 21 and the lower die holder 22; the diameter of the middle section through hole 23' of the dumbbell-shaped circular through hole is equal to that of the insulating layer 12, the length of the middle section through hole is greater than that of the insulating damage section 12a, and the length of the middle section through hole is less than or equal to that of the sheath removing section 13 a; the diameter of the end through hole 24' of the dumbbell-shaped circular through hole is larger than or equal to that of the sheath layer 13;
the upper die holder 21 and the lower die holder 22 are both provided with a heat insulation pipeline 25 connected with the die temperature controller 40; the upper die holder 21 is also provided with an insulating layer injection molding small hole 21a, the lower end of the insulating layer injection molding small hole 21a is communicated with the middle section through hole 23', and the upper end is connected with an injection molding pipe of the injection molding machine 41; see figure 7 for details.
b2 selection of mould for repairing sheath layer
A sheath layer repairing mold consisting of a sheath upper mold base 31 and a sheath lower mold base 32 is selected, and a sheath through hole with a large middle and two small ends is formed between the sheath upper mold base 31 and the sheath lower mold base 32; the diameter of the middle section through hole 33 of the sheath through hole is larger than that of the sheath layer 13, and the length is larger than that of the sheath removing section 13 a; the diameter of the end through hole 34 of the round through hole is equal to that of the sheath layer 13;
the sheath upper die holder 31 and the sheath lower die holder 32 are both provided with a sheath heat-insulating pipeline 35 connected with the die temperature controller 40; the sheath upper die holder 31 is also provided with a sheath injection molding small hole 31a, the lower end of the sheath injection molding small hole 31a is communicated with the middle section through hole 33, and the upper end of the sheath injection molding small hole is connected with an injection molding pipe of the injection molding machine 41; see figure 9 for details.
c. Repair of insulating layers
Moving the upper die base 21 away, placing the cable 10 with the insulation damage section removed obtained in the step a on the lower die base 22, covering the upper die base 21, and enabling the repair center 10a of the cable to coincide with the center of the middle section through hole 23' of the insulation layer repair die; at this time, the free space between the middle section through hole 23 'and the cable 10 is the insulation repair gap 12a' of the cable;
connecting the heat preservation pipeline 25 with a mold temperature controller 40, starting the mold temperature controller 40, raising the temperature of the insulation layer repairing mold to the melting temperature of the insulation layer repairing material, and preserving the heat;
connecting the upper end of the insulating layer injection molding small hole 21a with an injection molding pipe of an injection molding machine 41, immediately starting the injection molding machine 41, and injecting and filling the insulation repair gap 12a' of the cable with the fused insulating layer repair material through the injection molding pipe and the insulating layer injection molding small hole 21 a; then, the mold temperature controller 40 and the injection molding machine 41 are closed, after the injected insulation layer repairing material is cooled to room temperature, the upper mold base 21 is moved away, and the cable 10 is taken out, so that the cable 10 with the repaired insulation layer is obtained; see figure 8 for details.
d. Repair of jacket layer
Moving the upper sheath die holder 31 away, placing the cable 10 with the repaired insulating layer obtained in the step c on the lower sheath die holder 32, covering the upper sheath die holder 31, and enabling the repair center 10a of the cable to coincide with the center of the middle section through hole 33 of the sheath layer repair die;
connecting the sheath heat-insulating pipeline 35 with a mold temperature controller 40, starting the mold temperature controller 40, raising the temperature of the sheath layer repairing mold to the melting temperature of the sheath layer repairing material, and preserving heat;
connecting the upper end of the sheath layer injection molding small hole 31a with an injection molding pipe of an injection molding machine 41, immediately starting the injection molding machine 26, and injecting and filling the molten sheath layer repairing material into a middle section through hole 33 of a sheath layer repairing mold through the injection molding pipe and the sheath layer injection molding small hole 31 a; then, closing the mold temperature controller 40 and the injection molding machine 41, removing the sheath layer upper mold base 31 after the injected sheath layer repairing material is cooled to the room temperature, and taking out the cable 10 to obtain a repaired cable; see figure 10 for details.
As can be seen from examples 2 and 3, the large through hole 24 of the insulation repair mold in fig. 4 is practically identical to the end through hole 24' in fig. 7; namely, the method for repairing the damaged cable without the sheath layer (the first scheme) and the method for repairing the damaged cable with the sheath layer (the second scheme) can be completely the same.
Claims (3)
1. A general repair method for cable damage, wherein the cable (10) is composed of a conductor (11) at the center and an insulating layer (12) outside the conductor (11); the general repairing method comprises the following steps:
A. removal of damaged sections of insulation
Measuring the central position and the length of an insulation damage section (12a) where an insulation damage part of the cable (10) is located by using a leakage detector, marking the central position as a repair center (10a) of the cable, removing the insulation damage section (12a) to form an insulation repair gap (12a'), and obtaining the cable (10) with the insulation damage section removed;
B. selection of insulating layer repairing mould
An insulating layer repairing die consisting of an upper die holder (21) and a lower die holder (22) is selected, and a circular through hole (23) is formed between the upper die holder (21) and the lower die holder (22); the diameter of the round through hole (23) is equal to that of the insulating layer (12), the length of the round through hole is larger than that of the insulating damage section (12a), and the upper die base (21) and the lower die base (22) are both provided with heat insulation pipelines (25); the upper die holder (21) is also provided with an insulating layer injection molding small hole (21a), the lower end of the insulating layer injection molding small hole (21a) is communicated with the circular through hole (23), and the insulating layer injection molding small hole (21a) is positioned right above the circular through hole (23);
C. repair of insulating layers
Moving the upper die base (21) away, placing the cable (10) with the insulation damage section removed, which is obtained in the step A, on the lower die base (22), covering the upper die base (21), and enabling the repair center (10a) of the cable to coincide with the center of the middle section through hole (23) of the insulation layer repair die; at the moment, the free space between the circular through hole (23) and the cable (10) is an insulation repair gap (12a') of the cable;
connecting the heat preservation pipeline (25) with a mold temperature controller (40), starting the mold temperature controller (40), raising the temperature of the insulation layer repairing mold to the melting temperature of the insulation layer repairing material, and preserving the heat;
connecting the upper end of the insulating layer injection molding small hole (21a) with an injection molding pipe of an injection molding machine (41), immediately starting the injection molding machine (41), and injecting and filling the insulation repair gap (12a') of the cable with the fused insulating layer repair material through the injection molding pipe and the insulating layer injection molding small hole (21 a); and then closing the mold temperature machine (40) and the injection molding machine (41), removing the upper mold base (21) after the injected insulating layer repairing material is cooled to the room temperature, and taking out the cable (10) to obtain the repaired cable.
2. A universal method of repairing a damaged cable according to claim 1, wherein: and two ends of the round through hole (23) are also provided with a large through hole (24) with the diameter larger than that of the insulating layer (12).
3. A general repair method for cable damage, wherein a cable (10) consists of a conductor (11) at the center, an insulating layer (12) outside the conductor (11) and a sheath layer (13) outside the insulating layer (12); the general repairing method comprises the following steps:
a. removal of damaged section and sheath layer
Measuring the central position and the length of an insulation damage section (12a) where an insulation damage part of the cable (10) is located by using a leakage detector, marking the central position as a repair center (10a) of the cable, removing a sheath layer (13) outside the insulation damage section (12a), marking the removed sheath layer as a removed sheath section (13a), and removing the insulation damage section (12a) to form an insulation repair gap (12 a'); the length of the removed sheath section (13a) is greater than that of the insulation damage section (12a), and the cable (10) with the insulation damage section removed is obtained;
b. selection of repair mold
b1 selection of insulating layer repairing mould
An insulating layer repairing die consisting of an upper die holder (21) and a lower die holder (22) is selected, and a dumbbell-shaped circular through hole is formed between the upper die holder (21) and the lower die holder (22); the diameter of a middle section through hole (23') of the dumbbell-shaped circular through hole is equal to that of the insulating layer (12), the length of the middle section through hole is greater than that of the insulating damage section (12a), and the length of the middle section through hole is less than or equal to that of the sheath removing section (13 a); the diameter of the end through hole (24') of the dumbbell-shaped circular through hole is larger than or equal to that of the sheath layer (13);
the upper die holder (21) and the lower die holder (22) are respectively provided with a heat insulation pipeline (25) connected with the die temperature controller (40); an insulating layer injection molding small hole (21a) is also formed in the upper die base (21), the lower end of the insulating layer injection molding small hole (21a) is communicated with the middle section through hole (23'), and the upper end of the insulating layer injection molding small hole is connected with an injection molding pipe of an injection molding machine (41);
b2 selection of mould for repairing sheath layer
A sheath layer repairing die consisting of a sheath upper die holder (31) and a sheath lower die holder (32) is selected, and a sheath through hole with a large middle and two small ends is formed between the sheath upper die holder (31) and the sheath lower die holder (32); the diameter of the middle section through hole (33) of the sheath through hole is larger than that of the sheath layer (13), and the length of the middle section through hole is larger than that of the sheath removing section (13 a); the diameter of the through hole (34) at the end part of the round through hole is equal to that of the sheath layer (13);
the sheath upper die holder (31) and the sheath lower die holder (32) are both provided with a sheath heat-insulating pipeline (35) connected with the die temperature controller (40); the sheath upper die holder (31) is also provided with a sheath injection molding small hole (31a), the lower end of the sheath injection molding small hole (31a) is communicated with the middle section through hole (33), and the upper end of the sheath injection molding small hole is connected with an injection molding pipe of the injection molding machine (41);
c. repair of insulating layers
Moving the upper die base (21) away, placing the cable (10) with the insulation damage section removed, which is obtained in the step a, on the lower die base (22), covering the upper die base (21), and enabling the repair center (10a) of the cable to coincide with the center of the middle section through hole (23') of the insulation layer repair die; at the moment, the free space between the through hole (23') in the middle section and the cable (10) is an insulation repair gap (12a') of the cable;
connecting the heat preservation pipeline (25) with a mold temperature controller (40), starting the mold temperature controller (40), raising the temperature of the insulation layer repairing mold to the melting temperature of the insulation layer repairing material, and preserving the heat;
connecting the upper end of the insulating layer injection molding small hole (21a) with an injection molding pipe of an injection molding machine (41), immediately starting the injection molding machine (41), and injecting and filling the insulation repair gap (12a') of the cable with the fused insulating layer repair material through the injection molding pipe and the insulating layer injection molding small hole (21 a); then closing the mold temperature machine (40) and the injection molding machine (41), after the injected insulating layer repairing material is cooled to room temperature, moving the upper mold base (21), and taking out the cable (10), thus obtaining the cable (10) with the repaired insulating layer;
d. repair of jacket layer
Moving the sheath upper die holder (31) away, placing the cable (10) with the repaired insulating layer obtained in the step c on the sheath lower die holder (32), covering the sheath upper die holder (31), and enabling the repair center (10a) of the cable to coincide with the center of the middle section through hole (33) of the sheath layer repair die;
connecting a sheath heat-insulating pipeline (35) with a mold temperature controller (40), starting the mold temperature controller (40), heating the temperature of the sheath layer repairing mold to the melting temperature of the sheath layer repairing material, and preserving heat;
connecting the upper end of the sheath layer injection molding small hole (31a) with an injection molding pipe of an injection molding machine (41), immediately starting the injection molding machine (26), and injecting and filling the molten sheath layer repairing material into a middle section through hole (33) of a sheath layer repairing mold through the injection molding pipe and the sheath layer injection molding small hole (31 a); and then closing the mold temperature machine (40) and the injection molding machine (41), removing the sheath layer upper mold base (31) after the injected sheath layer repairing material is cooled to the room temperature, and taking out the cable (10) to obtain the repaired cable.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092396A (en) * | 2020-01-17 | 2020-05-01 | 天台婉枫电子有限公司 | Be used for exposed department insulating layer welding device of wire |
| CN111525465A (en) * | 2020-06-03 | 2020-08-11 | 艾凤英 | Repairing die for outer insulating layer of wire and cable |
| CN111817201A (en) * | 2020-06-09 | 2020-10-23 | 华南理工大学 | Method for eliminating cable insulation shielding ablation based on thermal stress |
| CN112034576A (en) * | 2020-10-28 | 2020-12-04 | 江苏亨通海洋光网系统有限公司 | Submarine optical cable insulation repair process |
| CN112202012A (en) * | 2020-09-22 | 2021-01-08 | 华南理工大学 | Connector and repair device for bad electrical contact inside high-voltage cable |
| CN115663443A (en) * | 2022-10-28 | 2023-01-31 | 珠海汉胜科技股份有限公司 | Online repair system for metal surface defects of inner conductor of leaky coaxial cable |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204695807U (en) * | 2015-05-21 | 2015-10-07 | 远东电缆有限公司 | A kind of wisdom energy selfreparing cable |
| CN205565553U (en) * | 2016-04-18 | 2016-09-07 | 滕辉 | Damaged prosthetic devices of set up cable insulating layer |
| CN106207889A (en) * | 2016-08-31 | 2016-12-07 | 四川新蓉电缆有限责任公司 | A kind of crosslinked polyethylene midium voltage cable insulation breakdown strengthens the method repaired |
| CN107706837A (en) * | 2017-09-19 | 2018-02-16 | 浙江昌泰电力电缆有限公司 | A kind of below 500KV cross-linked polyethylene insulated cables transition joint making and repair novel construction skill |
| CN207234305U (en) * | 2017-08-01 | 2018-04-13 | 安徽天元电缆有限公司 | A kind of whole section of repair apparatus of the coat layer of power cable |
-
2019
- 2019-09-20 CN CN201910892690.9A patent/CN110601097A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204695807U (en) * | 2015-05-21 | 2015-10-07 | 远东电缆有限公司 | A kind of wisdom energy selfreparing cable |
| CN205565553U (en) * | 2016-04-18 | 2016-09-07 | 滕辉 | Damaged prosthetic devices of set up cable insulating layer |
| CN106207889A (en) * | 2016-08-31 | 2016-12-07 | 四川新蓉电缆有限责任公司 | A kind of crosslinked polyethylene midium voltage cable insulation breakdown strengthens the method repaired |
| CN207234305U (en) * | 2017-08-01 | 2018-04-13 | 安徽天元电缆有限公司 | A kind of whole section of repair apparatus of the coat layer of power cable |
| CN107706837A (en) * | 2017-09-19 | 2018-02-16 | 浙江昌泰电力电缆有限公司 | A kind of below 500KV cross-linked polyethylene insulated cables transition joint making and repair novel construction skill |
Non-Patent Citations (1)
| Title |
|---|
| 孙红镱: "《油田非金属压力管道技术》", 31 August 2014 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111092396A (en) * | 2020-01-17 | 2020-05-01 | 天台婉枫电子有限公司 | Be used for exposed department insulating layer welding device of wire |
| CN111525465A (en) * | 2020-06-03 | 2020-08-11 | 艾凤英 | Repairing die for outer insulating layer of wire and cable |
| CN111525465B (en) * | 2020-06-03 | 2021-07-20 | 绍兴市森辉机械有限公司 | Repairing die for outer insulating layer of wire and cable |
| CN111817201A (en) * | 2020-06-09 | 2020-10-23 | 华南理工大学 | Method for eliminating cable insulation shielding ablation based on thermal stress |
| CN111817201B (en) * | 2020-06-09 | 2021-07-06 | 华南理工大学 | Method for eliminating cable insulation shielding ablation based on thermal stress |
| CN112202012A (en) * | 2020-09-22 | 2021-01-08 | 华南理工大学 | Connector and repair device for bad electrical contact inside high-voltage cable |
| CN112202012B (en) * | 2020-09-22 | 2022-02-18 | 华南理工大学 | Connector and repair device for bad electrical contact inside high-voltage cable |
| CN112034576A (en) * | 2020-10-28 | 2020-12-04 | 江苏亨通海洋光网系统有限公司 | Submarine optical cable insulation repair process |
| CN115663443A (en) * | 2022-10-28 | 2023-01-31 | 珠海汉胜科技股份有限公司 | Online repair system for metal surface defects of inner conductor of leaky coaxial cable |
| EP4387021A1 (en) * | 2022-12-14 | 2024-06-19 | Nexans | Method for repairing a cable outer semiconducting layer |
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