CN104617525B - A kind of restorative procedure of power cable thermoplastic insulation defect - Google Patents
A kind of restorative procedure of power cable thermoplastic insulation defect Download PDFInfo
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- CN104617525B CN104617525B CN201410857011.1A CN201410857011A CN104617525B CN 104617525 B CN104617525 B CN 104617525B CN 201410857011 A CN201410857011 A CN 201410857011A CN 104617525 B CN104617525 B CN 104617525B
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- shaper
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Abstract
The invention discloses a kind of restorative procedure of power cable thermoplastic insulation defect, it is characterised in that it comprises the following steps：(1) insulating barrier fault location is slotted；(2) adhesive tape is prepared；(3) parcel adhesive tape in annular groove；(4) core for being surrounded by adhesive tape repair layer is put into shaper；(5) extrusion forming；(6) interface equating；(7) repair and complete after detecting.The advantage of the invention is that, can be with safe, reliable and effective reparation 6KV and following power cable thermoplastic insulation defect using the inventive method, the uniform quality of insulated wire cores and normal insulation core after processing is ensure that, and can guarantee that the long-term safety operation of product；And effectively repair core and avoid unnecessary waste.
Description
Technical field：
The present invention relates to a kind of cable restorative procedure, is applied to 6KV and following power cable thermoplastic more particularly to one kind
The restorative procedure of property insulated with material defect.
Background technology：
Power cable is the cable for transmitting and distributing electric energy, is usually used in Urban Underground power network, power station, industrial and mining enterprises
Power be introduced into or lead line in, be the cable kind being most widely used in society.
Insulating properties are the most important performance indications of power cable product, directly influence whole cable product quality and
Can be safe for operation.
Cable conductor is when carrying out insulating exruded, due to extrusion temperature control, machine thorax, head and die surface cleanliness factor etc.
Reason, or even the cleanliness factor of insulating materials in itself, it can all influence the extrusion performance of insulation, it is possible to cause as shown in Figure 1 exhausted
Edge defect.The appearance of this defect, the product quality of cable will be had a strong impact on, some defects can be monitored by online spark and sent out
Existing, some defects may not found at that time, but finished product using when cause insulation breakdown short-circuit, turn into interruption of service.Insulation
After defect occurs, processing is bad to be made a big impact to next procedure, or even can cause scrapping for whole product.Therefore, it is raw
Prevent that the processing after insulation defect and defect generation from being very crucial for cables manufacturing factory in production.
General cable producer is that fault location is carried out into simple process (to go the removal of impurity, clean table mostly after insulation defect occurs
Face), then blow thermo-compression bonding with thermoplastic rifle with same material and handle.The degree of reliability of this processing method is not high, such as handing technique not
It is right, it is also possible to cause the expansion of defect.Another processing method is to section core in generation fault location, and this is for requiring fixed length
Product be worthless, very big waste can be caused.
The content of the invention：
It is an object of the invention to provide a kind of reparation side of effective, reliable power cable thermoplastic insulation defect
Method, ensure that the uniform quality of insulated wire cores and normal insulation core after processing, and can guarantee that the long-term safety operation of product.
The purpose of the present invention is implemented by following technical scheme：A kind of reparation side of power cable thermoplastic insulation defect
Method, it is characterised in that it comprises the following steps：(1) insulating barrier fault location is slotted；(2) adhesive tape is prepared；(3) wrapped up in annular groove
Adhesive tape；(4) core for being surrounded by adhesive tape repair layer is put into shaper；(5) extrusion forming；(6) interface equating；(7) detect
Repair and complete afterwards；Wherein,
(1) insulating barrier fault location is slotted：As shown in Fig. 2 outputed with insulating barrier fault location of the circular arc Knife for stripping cable in core
One section is the annular groove of isosceles triangle, and the benefit of both sides equity is to ensure the work quality of subsequent handling, is prevented herein
Place forms stress concentration.The angle of the waist of the isosceles triangle and the core center line is 15-25 degree, and the number of degrees are excessive, wound
Face reduces, but patching material contacts bad with the junction of orthodox material, can cause interlayer；The number of degrees are too small, and surface of a wound scope increases,
Corresponding mould, vulcanizing press area all need to increase, and economy is bad.Then the impurity in the annular groove is removed, is ensured
Fault location impurity treatment is clean；
(2) adhesive tape is prepared：Using insulating barrier material identical insulation micelle open refining at 6 with needing to repair
On molding machine, plasticate and be pressed into the thin slice that thickness is not more than 0.6mm, the thin slice is then cut into the suitable adhesive tape of width standby, root
Different, generally 20mm or so according to the voltage class of repaiied cable and section difference；
(3) parcel adhesive tape in annular groove：Side of the adhesive tape along the annular groove is equably twined to opposite side and formed
Adhesive tape repair layer, the big 2-5mm of core thickness of insulating layer described in the adhesive tape repair layer thickness ratio, is shown in Fig. 3, excessively thin to add in mould
Interlayer is produced during pressure, influences quality；
(4) core for being surrounded by adhesive tape repair layer is put into shaper：It will be tied with described in a section of the adhesive tape repair layer
Core is put into shaper, and mould drawing is shown in Fig. 5 and Fig. 6, the shaper die orifice internal diameter and the core outside dimension
Unanimously, the shaper length is more than the defects of pending length, the inner wall smooth of the shaper；
(5) extrusion forming：The shaper is put on vulcanizing press, the top surface of the shaper and bottom surface point
It is not in contact with the upper plane and lower plane of the vulcanizing press, the shaper is heated to the extrusion temperature of insulating materials
Then degree applies 4-4.2MPa pressure depending on material technology to the shaper, unloaded after being kept for 30-31.5 seconds
Carry；
(6) interface equating：The shaper is cooled to room temperature, opens the shaper, will shape what is repaired
The core takes out, and with circular arc Knife for stripping cable by the side interface equating of repair place two, sees Fig. 4；
(7) repair and complete after detecting：The core after reparation is placed into pond at room temperature, immersion is no less than 1
Hour, apply 3.5 times of U0Industrial frequency experiment voltage, continue 5min, the core is not breakdown, repair it is qualified.Industrial frequency experiment electricity
Press as cable conductor over the ground or the rated operational voltage metallic shield.
The shaper is rectangle, including upper die and lower die, the upper mould bottom are provided with boss by one end to the other end,
The groove being engaged with the boss is provided with by one end to the other end at the top of the lower mould, the boss with the groove by one
It is semicircular mold groove that end to the other end, which is respectively equipped with section, after the upper mould and the lower die button are closed, on the boss
The mold groove and the groove on the mold groove to form section be circular cavity.
The peak of the circular cavity is minimum to the vertical range between the upper mould top surface and the circular cavity
Point is equal to the vertical range between the lower mould bottom surface, in order to avoid cause to heat uneven.
It is an advantage of the current invention that can be with safe, reliable and effective reparation 6KV and following electric power using the inventive method
Cable thermoplastic insulation defect, ensure that the uniform quality of insulated wire cores and normal insulation core after processing, and can protect
Demonstrate,prove the long-term safety operation of product；And effectively repair core and avoid unnecessary waste.
Brief description of the drawings
Fig. 1 is defective core schematic diagram.
Fig. 2 is reparation step (1) schematic diagram.
Fig. 3 is reparation step (3) schematic diagram.
Fig. 4 is reparation step (6) schematic diagram.
Fig. 5 is shaper left view.
Fig. 6 is shaper front view.
Upper mould 1, lower mould 2, boss 3, groove 4, mold groove 5.
Embodiment：
Embodiment 1：A kind of restorative procedure of power cable thermoplastic insulation defect, it is characterised in that it is included such as
Lower step：(1) insulating barrier fault location is slotted；(2) adhesive tape is prepared；(3) parcel adhesive tape in annular groove；(4) it is surrounded by adhesive tape repair layer
Core be put into shaper；(5) extrusion forming；(6) interface equating；(7) repair and complete after detecting；Wherein,
(1) insulating barrier fault location is slotted：As shown in Fig. 2 outputed with insulating barrier fault location of the circular arc Knife for stripping cable in core
One section is the annular groove of isosceles triangle, and the benefit of both sides equity is to ensure the work quality of subsequent handling, is prevented herein
Place forms stress concentration.The angle of the waist of the isosceles triangle and the core center line is 15 degree, and the number of degrees are excessive, and the surface of a wound subtracts
It is small, but patching material contacts bad with the junction of orthodox material, can cause interlayer；The number of degrees are too small, and surface of a wound scope increases, accordingly
Mould, vulcanizing press area all need to increase, economy is bad.Then the impurity in the annular groove is removed, ensures to lack
It is clean to fall into place's impurity treatment；
(2) adhesive tape is prepared：Using insulating barrier material identical insulation micelle open refining at 6 with needing to repair
On molding machine, plasticate and be pressed into the thin slice that thickness is not more than 0.6mm, the thin slice is then cut into the suitable adhesive tape of width standby, root
Different, generally 20mm or so according to the voltage class of repaiied cable and section difference；
(3) parcel adhesive tape in annular groove：Side of the adhesive tape along the annular groove is equably twined to opposite side and formed
Adhesive tape repair layer, the big 2-5mm of core thickness of insulating layer, such as Fig. 3, excessively thin to add in mould described in the adhesive tape repair layer thickness ratio
Interlayer is produced during pressure, influences quality；
(4) core for being surrounded by adhesive tape repair layer is put into shaper：It will be tied with described in a section of the adhesive tape repair layer
Core is put into shaper, and shaper structure is shown in Fig. 5 and Fig. 6, the shaper die orifice internal diameter and the core external diameter
Size is consistent, and the shaper length is more than the defects of pending length, the inner wall smooth of the shaper；
(5) extrusion forming：The shaper is put on vulcanizing press, the top surface of the shaper and bottom surface point
It is not in contact with the upper plane and lower plane of the vulcanizing press, the shaper is heated to the extrusion temperature of insulating materials
Then degree applies 4MPa pressure depending on material technology to the shaper, unloaded after being kept for 30 seconds；
(6) interface equating：The shaper is cooled to room temperature, opens the shaper, will shape what is repaired
The core takes out, and with circular arc Knife for stripping cable by the side interface equating of repair place two, sees Fig. 4；
(7) repair and complete after detecting：The core after reparation is placed into pond at room temperature, soaks 1 hour, applies
Add 3.5 times of U0Industrial frequency experiment voltage, continue 5min, the core is not breakdown, repair it is qualified.Industrial frequency experiment voltage is cable
Conductor is over the ground or the rated operational voltage metallic shield.
Shaper is rectangle, including upper mould 1 and lower mould 2, the upper bottom of mould 1 are provided with boss 3, lower mould by one end to the other end
2 tops are provided with the groove 4 being engaged with boss 3 by one end to the other end, and boss 3 on groove 4 by one end to the other end with being distinguished
It is semicircular mold groove 5 provided with section, after upper mould 1 and lower mould 2 fasten, on the mold groove 5 and groove 5 on boss 3
Mold groove 5 forms section as circular cavity.Vertical range and circle between the supreme top surface of mould 1 of peak of circular cavity
The minimum point of cavity is equal to the vertical range between the lower bottom surface of mould 2, in order to avoid cause to heat uneven.
Claims (2)
1. a kind of restorative procedure of power cable thermoplastic insulation defect, it is characterised in that it comprises the following steps：(1)
Insulating barrier fault location is slotted；(2) adhesive tape is prepared；(3) parcel adhesive tape in annular groove；(4) core for being surrounded by adhesive tape repair layer is put into
In shaper；(5) extrusion forming；(6) interface equating；(7) repair and complete after detecting；Wherein,
(1) insulating barrier fault location is slotted：It is isosceles to output a section in the insulating barrier fault location of core with circular arc Knife for stripping cable
The annular groove of triangle, the angle of the waist of the isosceles triangle and the core center line is 15-25 degree, then described in removal
Impurity in annular groove, ensure fault location impurity treatment is clean；
(2) adhesive tape is prepared：Using insulating barrier material identical insulation micelle open type plastic purificating set at 6 with needing to repair
On, plasticate and be pressed into the thin slice that thickness is not more than 0.6mm, it is standby that the thin slice is then cut into the suitable adhesive tape of width；
(3) parcel adhesive tape in annular groove：Side of the adhesive tape along the annular groove is equably twined to opposite side and forms adhesive tape
Repair layer, the big 2-5mm of core thickness of insulating layer described in the adhesive tape repair layer thickness ratio；
(4) core for being surrounded by adhesive tape repair layer is put into shaper：A section core of the adhesive tape repair layer will be tied with
It is put into shaper, the shaper die orifice internal diameter is consistent with the core outside dimension, and the shaper length is big
The length in pending the defects of, the inner wall smooth of the shaper；
(5) extrusion forming：The shaper is put on vulcanizing press, the top surface of the shaper and bottom surface respectively with
The upper plane and lower plane of the vulcanizing press are in contact, and the shaper is heated to the extrusion temperature of insulating materials,
Then apply 4-4.2MPa pressure to the shaper, unloaded after being kept for 30-31.5 seconds；
(6) interface equating：The shaper is cooled to room temperature, opens the shaper, by described in sizing reparation
Core takes out, with circular arc Knife for stripping cable by the side interface equating of repair place two；
(7) repair and complete after detecting：The core after reparation is placed into pond at room temperature, immersion is no less than 1 hour,
Apply 3.5 times of U0Industrial frequency experiment voltage, continue 5min, the core is not breakdown, repair it is qualified；
The shaper is rectangle, including upper die and lower die, and the upper mould bottom is provided with boss by one end to the other end, described
The groove being engaged with the boss is provided with by one end to the other end at the top of lower mould, the boss with the groove by one end extremely
It is semicircular mold groove that the other end, which is respectively equipped with section, after the upper mould and the lower die button are closed, the institute on the boss
It is circular cavity to state mold groove and form section with the mold groove on the groove.
A kind of 2. restorative procedure of power cable thermoplastic insulation defect according to claim 1, it is characterised in that
The peak of the circular cavity to the vertical range between the upper mould top surface and the circular cavity minimum point to described
Vertical range between lower mould bottom surface is equal.
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| CN201410857011.1A CN104617525B (en) | 2014-12-30 | 2014-12-30 | A kind of restorative procedure of power cable thermoplastic insulation defect |
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| CN201410857011.1A CN104617525B (en) | 2014-12-30 | 2014-12-30 | A kind of restorative procedure of power cable thermoplastic insulation defect |
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| CN104617525A CN104617525A (en) | 2015-05-13 |
| CN104617525B true CN104617525B (en) | 2017-12-22 |
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| CN108832248B (en) * | 2016-04-28 | 2020-08-18 | 杭州富通电线电缆有限公司 | Manufacturing process of radio frequency cable |
| 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 |
| CN108683118A (en) * | 2018-04-18 | 2018-10-19 | 日照港股份有限公司动力分公司 | The cold sulphur restorative procedure of high-voltage flexible cable |
| CN110635405A (en) * | 2018-09-28 | 2019-12-31 | 西南交通大学 | Repairing method for insulation damage cable matched with repairing material |
| CN109318450A (en) * | 2018-11-27 | 2019-02-12 | 江苏亨通海洋光网系统有限公司 | There are relaying submarine optical fiber cable insulating layer reparation injection mold, adapted to injection system and renovation technique |
| CN110040573B (en) * | 2019-03-16 | 2021-05-07 | 陈益敏 | Device for detecting, maintaining and storing damage of electric wire for coal mine and using method |
| CN110070966A (en) * | 2019-05-08 | 2019-07-30 | 哈尔滨理工大学 | A kind of water-fast tree cable preparation method |
| CN112072570A (en) * | 2020-08-19 | 2020-12-11 | 宁波球冠电缆股份有限公司 | Cable outer sheath repairing device and using method |
| CN113488928A (en) * | 2021-08-08 | 2021-10-08 | 南京中车浦镇城轨车辆有限责任公司 | Cable repairing method for rail transit vehicle |
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| CN201690165U (en) * | 2009-11-17 | 2010-12-29 | 上海橡胶制品研究所 | Die for repairing breakage of cable insulation sheath layer |
| CN102361270A (en) * | 2011-08-23 | 2012-02-22 | 李林霄 | Restoration method of cable used by internal combustion engine traction locomotive and electric power traction locomotive |
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| JPH04265608A (en) * | 1991-02-19 | 1992-09-21 | Furukawa Electric Co Ltd:The | Method for recovering joint for rubber plastic insulated power cable |
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| CN201690165U (en) * | 2009-11-17 | 2010-12-29 | 上海橡胶制品研究所 | Die for repairing breakage of cable insulation sheath layer |
| CN102361270A (en) * | 2011-08-23 | 2012-02-22 | 李林霄 | Restoration method of cable used by internal combustion engine traction locomotive and electric power traction locomotive |
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Denomination of invention: A Repair Method for Insulation Defects of Thermoplastic Materials in Power Cables Effective date of registration: 20230323 Granted publication date: 20171222 Pledgee: Bank of China Limited by Share Ltd. Hohhot Yuquan branch Pledgor: INNER MONGOLIA RENDA SPECIAL CABLE Co.,Ltd. Registration number: Y2023150000047 |
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