CN110601098A - Standardized repair method for cable damage - Google Patents
Standardized repair method for cable damage Download PDFInfo
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- CN110601098A CN110601098A CN201910893314.1A CN201910893314A CN110601098A CN 110601098 A CN110601098 A CN 110601098A CN 201910893314 A CN201910893314 A CN 201910893314A CN 110601098 A CN110601098 A CN 110601098A
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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
A standardized repair method for cable damage comprises the following steps: removing the insulation damage part to form a standardized insulation repair gap to obtain the cable to be repaired from which the insulation damage part is removed; selection of an insulating layer repairing mold: selecting an insulation layer repairing die corresponding to the specification of the cable, wherein the diameter of a through hole in the middle section of a circular through hole of the die is larger than the diameter of the maximum insulation layer of the specification cable, and the length of the through hole is larger than the length of an insulation repairing gap; the diameter of the supporting through hole at the two ends is equal to the diameter of the maximum insulating layer of the specification cable; repairing the insulating layer: winding insulating adhesive tapes on the insulating layers on the two sides of the insulation repair gap, and increasing the diameter to the maximum diameter of the insulating layer to obtain a cable with the insulating layer on the gap side and the insulating layer on the gap side having the standardized diameter; then placing the cable in a die to ensure that the repair center of the cable is superposed with the center of the through hole in the middle section; and opening a mold temperature machine and an injection molding machine, and performing injection molding to obtain the repaired cable. The method can carry out unified and standardized repair on insulation failures of different forms of the cable, and is simple, convenient, low in cost and good in quality.
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 local damage to the cable: 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. I.e. will insulate under invisible conditionsOpening a liquid injection port at the failure part, and injecting repairing liquids such as a silicone resin solution, a titanate solution and the like into the cable insulating layer and the sheath layer; the repair liquid reacts with compounds (impurities) in the water tree damage 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 and the liquid outlet hole on the upper part, so that the repairing of the insulation failure cable on the mechanical damage part on the upper part is realized. The device has a complex structure, and the damaged part needs to be aligned to the liquid outlet of the upper melting cavity when in repair; and when the damaged part is obviously larger than the distribution interval (radian) right below the liquid outlet, the damaged part can not be completely repaired, and needs to be realigned to carry out two or more repairing operations, so that the operation is troublesome and the repairing 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. And aiming at the repair of cables with different insulating layer thicknesses and different insulating damage lengths, a mould for temporarily and specially manufacturing cable repair holes with corresponding diameters and lengths is needed, or a plurality of moulds with different specifications are equipped for selection.
In summary, there are three insulation failure reasons, and the existing repair method adopts different materials to repair different insulation failure types of cables according to different types (reasons) of insulation failure, and cannot adopt one tool and 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 standardized repair method for cable damage, which can be used for uniformly repairing insulation failures of different forms of cables, and has the advantages of standardized, simple and convenient repair operation, low repair cost and good repair quality.
The first technical scheme adopted by the invention for realizing the aim is a standardized 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 standardized repairing method comprises the following steps:
A. removal of insulation damage
Measuring the cable center of the insulation damage part of the cable to be repaired by using a leakage detector, and marking the center as a repair center of the cable; removing the insulating layer around the repair center, wherein the removal length of the insulating layer is equal to the set removal length of the insulating layer corresponding to the specification of the cable to be repaired, so that a standardized insulation repair gap is formed, and the cable to be repaired with the insulation damage part removed is obtained;
B. selection of insulating layer repairing mould
Selecting an insulating layer repairing die corresponding to the specification of a cable to be repaired, wherein the insulating layer repairing die comprises an upper die base and a lower die base, and a circular through hole with a large middle and two small ends is formed between the upper die base and the lower die base; the diameter of the through hole at the middle section of the circular through hole is larger than the diameter of the maximum insulating layer of the cable with the specification, and the length of the through hole is larger than the length of the insulation repair gap; the two ends of the round through hole are provided with supporting through holes, and the diameter of the supporting through holes is equal to the diameter of the maximum insulating layer of the cable with the specification;
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;
C. repair of insulating layers
C1, winding an insulating tape on the insulating layers on the two sides of the insulation repair gap of the cable to be repaired obtained in the step A, so that the diameter of the insulating tape is increased to the diameter of the maximum insulating layer, and obtaining the cable to be repaired with the diameter of the insulating layer on the gap side standardized;
c2, moving the upper die base of the insulating layer repairing die away, placing the cable to be repaired on the lower die base, covering the upper die base, and enabling the repairing center of the cable to coincide with the center of the through hole in the middle section of the insulating layer repairing die; at the moment, the free space between the through hole in the middle section and the cable is an insulation repair cavity 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 insulating 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 melted insulating layer repair material into the insulating repair cavity through the injection molding pipe and the insulating layer injection molding small hole; and then closing the mold temperature machine and the injection molding machine, removing the upper mold base after the injected insulation 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.
The gauge of the cable to be repaired refers to the cross-sectional area of the conductor, and a typical gauge is 2.5mm2、4mm2、6mm2、10mm2. The diameter of the electric conductor is the same, but the diameter of the insulating layer is different; the maximum diameter of the insulating layer corresponding to the specification of the cable to be repaired refers to the maximum diameter of the insulating layer in the cable with the same specification.
The specific determination method for repairing the length of the gap of the insulating layer, namely removing the length in the insulating layer with the length corresponding to the specification of the cable to be repaired, comprises the following steps: counting the length value of the damaged part when the cables of the same specification are subjected to insulation damage to obtain a probability distribution map of the length value of the damaged part; finding out the length value of the longest damage part within a set probability (60% -90%); namely the length of the repaired gap of the insulation layer with the cable specification (the length corresponding to the cable specification).
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 and standardized annular insulation repair cavity, wherein the repair material can smoothly reach any part of the annular repair cavity and fill the whole repair cavity; in the whole process of injecting and filling the repair material into the repair cavity, the temperature of the whole repair area is always kept constant at the melting point of the repair material by a mold temperature controller, so that the repair material and the existing insulating layer material are fully fused; in addition, the side part of the insulation repair cavity forms a coating on the insulation layer at the side of the insulation repair gap; the two are firmly combined; the injection molding repair quality is good.
The diameter of a through hole in the middle section of the insulating layer repairing die used in the repairing process is larger than the diameter of the maximum insulating layer of the cable with the same specification, and the length is the set removal length of the insulating layer of the cable with the same specification; when the cable is arranged in the circular through hole, the insulating layers on two sides of the circular gap of the cable are wound with the insulating tapes and then form tight fit with the supporting through hole to support the cable; therefore, the thickness of the injection-molded and repaired insulating layer of the insulating repair cavity is consistent, and the repair quality is good. 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.
Fourthly, for cables to be repaired with the same specification (the same diameter of the electric conductors), the diameters of the insulating layers are different, the lengths of the insulating damage parts are naturally different, and molds with different insulating layer diameters and different insulating damage lengths need to be temporarily prepared or selected in the prior art. The invention sets an insulation layer removal length for the cables with the same specification, wherein the length value is the maximum value of the insulation damage length of the cables with the same specification within an acceptable probability range (60% -90%); thereby guarantee under most circumstances, can both use same mould to repair different damage length. Meanwhile, the insulating tapes are wound on the insulating layers on two sides of the repair gap, and the diameter of the insulating tapes is enlarged to the maximum diameter of the existing cables with the same specification, so that the cables with the same specification and different insulating layer diameters can be repaired by adopting a standardized die to carry out standardized operation. The repairing operation is standardized, simple and convenient, and the repairing cost is low.
The second technical scheme adopted by the invention for realizing the purpose of the invention is that the cable damage standardized repair method comprises a conductor at the center, an insulating layer outside the conductor and a sheath layer outside the insulating layer; the standardized repairing method comprises the following steps:
a. removal of damaged sections of insulation
Measuring the cable center of the insulation damage part of the cable to be repaired by using a leakage detector, and marking the center as a repair center of the cable; sequentially removing the sheath layer and the insulating layer around the repair center to form an insulating repair gap; the length of the removed sheath layer is equal to the set removal length of the sheath layer corresponding to the specification of the cable to be repaired, the removal length of the insulating layer is equal to the set removal length of the insulating layer corresponding to the specification of the cable to be repaired, and the set removal length of the sheath layer is greater than the set removal length of the insulating layer, so that the cable to be repaired with the damaged insulating part removed is obtained;
b. selection of repair mold
b1 selection of insulating layer repairing mould
Selecting an insulating layer repairing die corresponding to the specification of a cable to be repaired, wherein the insulating layer repairing die comprises an upper die holder and a lower die holder, and a multi-section 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 round through hole is larger than the diameter of the maximum insulating layer, the length of the middle section through hole is larger than the length of the insulation repairing gap, and the length of the middle section through hole is smaller than the set removal length of the sheath layer; two sides of the middle section through hole are small through hole sections with the diameter equal to the diameter of the largest insulating layer, and the sum of the length of the small through hole sections on the two sides and the length of the insulating repair gap is equal to the set removal length of the insulating layer; two ends of the round through hole are large through hole sections with the diameter larger than the diameter of the maximum sheath layer of the cable;
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 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 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 corresponding to the specification of the cable to be repaired, wherein the die comprises a sheath upper die holder and a sheath lower die holder, and a spindle-shaped circular through hole is formed between the sheath upper die holder and the sheath lower die holder; the diameter of a through hole in the middle of the spindle-shaped round through hole is larger than the diameter of the maximum sheath layer, and the length of the through hole is larger than the length of the sheath layer; the diameter of the through hole at the end part of the spindle-shaped circular through hole is equal to the diameter of the maximum 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
c1, winding insulating tapes on two sides of the insulation repair gap of the cable to be repaired obtained in the step a, so that the diameter of the insulating tapes is increased to the diameter of the maximum insulating layer of the cable with the specification, and obtaining the cable to be repaired with the insulation layer on the gap side with the standardized diameter;
c2, moving the upper die base away, placing the cable to be repaired on the lower die base, covering the upper die base, and enabling the repair center of the cable to coincide with the center of the middle-section through hole of the insulating layer repair die; at the moment, the free space between the middle section through hole and the cable is an insulation repair cavity 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 insulating 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 insulating layer repair material into the insulating repair cavity through the injection molding pipe and the insulating layer injection molding small hole; 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, taking out the cable, and removing the insulating adhesive tape wound on the insulating layer to obtain the cable with the repaired insulating layer;
d. standardized repair of jacket layers
d1, winding insulating tapes on two sides of the cable with the repaired insulating layer obtained in the step c2, wherein the two sides are provided with the removed sheath layer, so that the diameter of the insulating tapes is increased to the maximum diameter of the sheath layer, and the cable with the standardized sheath on the side of the removed sheath layer is obtained;
d2, moving the sheath upper die base away, placing the sheath standardized cable on the sheath lower die base, covering the sheath upper die base, and enabling the repair center of the cable to coincide with the center of the middle through hole of the sheath layer repair die; at the moment, the free space between the middle through hole and the cable is a sheath repairing cavity of the cable;
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 sheath repairing cavity 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:
the method comprises the steps of setting a sheath layer set removal length larger than the insulation layer set removal length on the basis of setting the insulation layer removal length of cables with the same specification to the maximum length within an acceptable probability range (60% -90%); thereby guarantee under most circumstances, can both use same mould to repair the cable that has the different damage length of restrictive coating. Meanwhile, the insulating adhesive tapes are wound on the sheath layers on two sides of the repair notch, and the diameters of the insulating adhesive tapes are enlarged to the maximum diameter of the existing cables with the same specification, so that the cables with the same specification and different sheath layer diameters can be repaired by adopting a standardized die to carry out standardized operation. The repairing operation is standardized, simple and convenient, and the repairing cost is low.
The four advantageous effects of the first technical means are also completely achieved in the present technical means.
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 diagram of a cable after an insulating layer of a length corresponding to a specification of a cable to be repaired is removed in embodiments 1 and 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 diagram of a cable after removing an insulating layer of a length corresponding to a specification of a cable to be repaired 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 standardized repair method of cable damage, the said cable 10 is made up of conductor 11, insulating layer 12 outside conductor 11 in the centre; the standardized repairing method comprises the following steps:
A. removal of insulation damage
Measuring the cable center of the insulation damage part of the cable 10 to be repaired by using a leakage detector, and marking the center as a repair center 10a of the cable; removing the insulating layer around the repair center 10a, wherein the removal length of the insulating layer is equal to the set removal length of the insulating layer corresponding to the specification of the cable to be repaired, so as to form a standardized insulation repair gap 12a and obtain the cable 10 to be repaired from which the insulation damage part is removed; see figure 1 for details.
B. Selection of insulating layer repairing mould
Selecting an insulating layer repairing die corresponding to the specification of the cable 10 to be repaired, wherein the die comprises an upper die holder 21 and a lower die holder 22, and a circular through hole with a large middle and two small ends 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 circular through hole is larger than the diameter of the maximum insulating layer of the cable with the specification, and the length of the middle section through hole is larger than the length of the insulation repair gap 12 a; the two ends of the round through hole are provided with supporting through holes 24, and the diameter of the supporting through holes is equal to the diameter of the maximum insulating layer of the cable with the specification;
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 of the insulating layer injection molding small hole is connected with an injection molding pipe of the injection molding machine 41; see figure 2 for details.
C. Repair of insulating layers
C1, winding an insulating tape on the insulating layers on the two sides of the insulation repair gap 12a of the cable 10 to be repaired obtained in the step A, so that the diameter of the insulating tape is increased to the diameter of the maximum insulating layer, and obtaining the cable 10 to be repaired with the insulating layer with the normalized diameter on the gap side;
c2, moving the upper die base 21 of the insulating layer repairing die away, placing the cable 10 to be repaired on the lower die base 22, covering the upper die base 21, and enabling the repairing center 10a of the cable to coincide with the center of the middle section through hole 23 of the insulating layer repairing die; at this time, the free space between the middle section through hole 23 and the cable 10 is the insulation repair cavity 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 fused insulating layer repair material into the insulating repair cavity 12a' 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 repaired cable 10 is obtained; see figure 3 for details.
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 support through hole 24 of the selected insulation layer repairing mould are also provided with large through hole sections 24 with diameters larger than the diameter of the maximum insulation layer.
The insulating layer repair mold with the large through-hole 24 is substantially identical to the insulating layer repair mold of example 3. When the damage of the cable insulating layer without the sheath layer is repaired, the large through hole 24 is not used in the air; in example 3 below, the large through hole 24 is used for placing the sheath layer left on both sides of the damaged section of the cable insulation. Therefore, the same insulating layer repairing mold can be used for repairing the cable insulating layer with or without the sheath layer.
Example 3
Fig. 6-10 show that a third embodiment of the present invention is: a standardized repair method of cable damage, the said cable 10 is made up of conductor 11, insulating layer 12 outside the conductor 11, sheath layer 13 outside the insulating layer 12 in the centre; the standardized repairing method comprises the following steps:
a. removal of damaged sections of insulation
Measuring the cable center of the insulation damage part of the cable 10 to be repaired by using a leakage detector, and marking the center as a repair center 10a of the cable; then, sequentially removing the sheath layer and the insulating layer around the repairing center 10a to form an insulating repairing gap 12 a; the length of the removed sheath layer is equal to the set removal length of the sheath layer corresponding to the specification of the cable to be repaired, the removal length of the insulating layer is equal to the set removal length of the insulating layer corresponding to the specification of the cable to be repaired, and the set removal length of the sheath layer is greater than the set removal length of the insulating layer, so that the cable 10 to be repaired with the damaged insulating part removed is obtained; see figure 6 for details.
b. Selection of repair mold
b1 selection of insulating layer repairing mould
Selecting an insulating layer repairing die corresponding to the specification of the cable 10 to be repaired, wherein the die comprises an upper die holder 21 and a lower die holder 22, and a multi-section 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 round through hole is larger than the diameter of the maximum insulating layer, the length of the middle section through hole is larger than the length of the insulation repairing gap 12a, and the length of the middle section through hole is smaller than the set removal length of the sheath layer; two sides of the middle section through hole 23' are small through hole sections 24' with the diameter equal to the diameter of the maximum insulating layer, and the sum of the length of the small through hole sections 24' on the two sides and the length of the insulation repair gap 12a is equal to the set removal length of the insulating layer; two ends of the round through hole are large through hole sections 26 with the diameter larger than the diameter of the maximum sheath layer of the cable;
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
Selecting a sheath layer repairing mold corresponding to the specification of the cable 10 to be repaired, wherein the mold comprises an upper sheath mold seat 31 and a lower sheath mold seat 32, and spindle-shaped circular through holes are formed between the upper sheath mold seat 31 and the lower sheath mold seat 32; the diameter of the middle through hole 33 of the spindle-shaped round through hole is larger than the diameter of the maximum sheath layer, and the length of the middle through hole is larger than the length of the sheath layer; the diameter of the through hole 34 at the end part of the spindle-shaped circular through hole is equal to the diameter of the maximum sheath layer;
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 is connected with an injection molding pipe of the injection molding machine 41; see figure 9 for details.
c. Repair of insulating layers
c1, winding insulating adhesive tapes on two sides of the insulation repair gap 12a of the cable 10 to be repaired obtained in the step a, so that the diameter of the insulating tape is increased to the diameter of the maximum insulating layer of the cable with the specification, and obtaining the cable 10 to be repaired with the insulation layer on the gap side with the standardized diameter;
c2, moving the upper die holder 21 away, placing the cable 10 to be repaired on the lower die holder 22, covering the upper die holder 21, and enabling the repair center 10a of the cable to coincide with the center of the middle-section through hole 23' of the insulating layer repair die; at this time, the free space between the middle section through hole 23 'and the cable 10 is the insulation repair cavity 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 repairing cavity 12a' with the fused insulating layer repairing 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, the cable 10 is taken out, and the insulation adhesive tape wound on the insulation layer is removed, so that the cable 10 with the repaired insulation layer is obtained; see figure 8 for details.
d. Standardized repair of jacket layers
d1, winding insulating tapes on two sides of the cable 10 with the repaired insulating layer obtained in the step c2, wherein the two sides are provided with the removed sheath layer, so that the diameter of the insulating tapes is increased to the maximum diameter of the sheath layer, and the cable 10 with the normalized sheath layer on the side of the removed sheath layer is obtained;
d2, moving the sheath upper die base 31 away, placing the sheath standardized cable 10 on the sheath lower die base 32, covering the sheath upper die base 31, and enabling the repair center 10a of the cable to coincide with the center of the middle through hole 33 of the sheath layer repair die; at this time, the free space between the middle through hole 33 and the cable 10 is a sheath repair cavity 33a of the cable;
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 41, and injecting and filling the molten sheath layer repairing material into the sheath repairing cavity 33a 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 via segment 24 of the insulation repair mold in fig. 4 is practically identical to the end via 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 standardized repairing method for cable damage is disclosed, wherein the cable (10) is composed of a conductor (11) at the center and an insulating layer (12) outside the conductor (11); the standardized repairing method comprises the following steps:
A. removal of insulation damage
Measuring the cable center of the insulation damage part of the cable (10) to be repaired by using a leakage detector, and marking the center as a repair center (10a) of the cable; removing the insulating layer around the repair center (10a), wherein the removal length of the insulating layer is equal to the set removal length of the insulating layer corresponding to the specification of the cable to be repaired, and forming a standardized insulation repair gap (12a) to obtain the cable (10) to be repaired from which the insulation damage part is removed;
B. selection of insulating layer repairing mould
Selecting an insulating layer repairing die corresponding to the specification of a cable (10) to be repaired, wherein the die consists of an upper die holder (21) and a lower die holder (22), and a circular through hole with a large middle and two small ends is formed between the upper die holder (21) and the lower die holder (22); the diameter of a through hole (23) in the middle section of the circular through hole is larger than the diameter of the maximum insulating layer of the cable with the specification, and the length of the through hole is larger than that of the insulation repair gap (12 a); the two ends of the round through hole are provided with supporting through holes (24), and the diameter of the supporting through holes is equal to the diameter of the maximum insulating layer of the cable with the specification;
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);
C. repair of insulating layers
C1, winding an insulating tape on the insulating layers on the two sides of the insulation repair gap (12a) of the cable (10) to be repaired obtained in the step A, so that the diameter of the insulating tape is increased to the maximum diameter of the insulating layer, and obtaining the cable (10) to be repaired with the insulation layer on the gap side with the standardized diameter;
c2, moving the upper die base (21) of the insulating layer repairing die away, then placing the cable (10) to be repaired on the lower die base (22), then covering the upper die base (21), and enabling the repairing center (10a) of the cable to coincide with the center of the middle section through hole (23) of the insulating layer repairing die; at the moment, the free space between the through hole (23) at the middle section and the cable (10) is an insulation repair cavity (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 fused insulating layer repairing material into the insulating repairing cavity (12a') 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 (10).
2. A universal method of repairing a damaged cable according to claim 1, wherein: and the two ends of the supporting through hole (24) are also provided with large through hole sections (24) with the diameter larger than that of the maximum insulating layer.
3. A standardized repairing method for cable damage is characterized in that 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 standardized repairing method comprises the following steps:
a. removal of damaged sections of insulation
Measuring the cable center of the insulation damage part of the cable (10) to be repaired by using a leakage detector, and marking the center as a repair center (10a) of the cable; then, sequentially removing the sheath layer and the insulating layer around the repairing center (10a) to form an insulating repairing gap (12 a); the length of the removed sheath layer is equal to the set removal length of the sheath layer corresponding to the specification of the cable to be repaired, the removal length of the insulating layer is equal to the set removal length of the insulating layer corresponding to the specification of the cable to be repaired, and the set removal length of the sheath layer is greater than the set removal length of the insulating layer, so that the cable (10) to be repaired with the damaged insulating part removed is obtained;
b. selection of repair mold
b1 selection of insulating layer repairing mould
Selecting an insulating layer repairing die corresponding to the specification of a cable (10) to be repaired, wherein the die consists of an upper die holder (21) and a lower die holder (22), and a multi-section 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 round through hole is larger than the diameter of the maximum insulating layer, the length of the middle section through hole is larger than the length of the insulating repair gap (12a), and the length of the middle section through hole is smaller than the set removal length of the sheath layer; two sides of the middle section through hole (23') are small through hole sections (24') with the diameter equal to the diameter of the largest insulating layer, and the sum of the length of the small through hole sections (24') on the two sides and the length of the insulating repair gap (12a) is equal to the set removal length of the insulating layer; two ends of the round through hole are large through hole sections (26) with the diameter larger than the diameter of the maximum sheath layer of the cable;
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 the injection molding machine (41);
b2 selection of mould for repairing sheath layer
Selecting a sheath layer repairing mold corresponding to the specification of a cable (10) to be repaired, wherein the mold consists of an upper sheath mold base (31) and a lower sheath mold base (32), and spindle-shaped circular through holes are formed between the upper sheath mold base (31) and the lower sheath mold base (32); the diameter of a middle through hole (33) of the spindle-shaped round through hole is larger than the diameter of the maximum sheath layer, and the length of the middle through hole is larger than the length of the sheath layer; the diameter of the through hole (34) at the end part of the spindle-shaped round through hole is equal to the diameter of the maximum sheath layer;
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 sheath layer injection molding small holes (31a), the lower ends of the sheath layer injection molding small holes (31a) are communicated with the middle section through hole (33), and the upper ends of the sheath layer injection molding small holes are connected with an injection molding pipe of the injection molding machine (41);
c. repair of insulating layers
c1, winding insulating adhesive tapes on two sides of the insulation repair gap (12a) of the cable (10) to be repaired obtained in the step a, increasing the diameter of the insulating tapes to the maximum insulating layer diameter of the cable with the specification, and obtaining the cable (10) to be repaired with the insulation layer diameter on the gap side standardized;
c2, moving the upper die base (21), placing the cable (10) to be repaired 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 middle section through hole (23') and the cable (10) is an insulation repair cavity (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 melted insulating layer repairing material into the insulating repairing cavity (12a') 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), moving the upper mold base (21) after the injected insulating layer repairing material is cooled to the room temperature, taking out the cable (10), and removing the insulating adhesive tape wound on the insulating layer to obtain the cable (10) with the repaired insulating layer;
d. standardized repair of jacket layers
d1, winding insulating tapes on two sides of the cable (10) with the repaired insulating layer obtained in the step c2, wherein the two sides are provided with the removed sheath layer, so that the diameter of the insulating tapes is increased to the maximum diameter of the sheath layer, and the cable (10) with the standardized sheath on the side of the removed sheath layer is obtained;
d2, moving the sheath upper die holder (31) away, placing the cable (10) with the sheath standardized 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 through hole (33) of the sheath layer repair die; at the moment, the free space between the middle through hole (33) and the cable (10) is a sheath repairing cavity (33a) of the cable;
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 (41), and injecting and filling the molten sheath layer repairing material into the sheath repairing cavity (33a) 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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Application publication date: 20191220 |