CN104466816A - Technology for improving electric power cable maintenance efficiency - Google Patents
Technology for improving electric power cable maintenance efficiency Download PDFInfo
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- CN104466816A CN104466816A CN201410787039.2A CN201410787039A CN104466816A CN 104466816 A CN104466816 A CN 104466816A CN 201410787039 A CN201410787039 A CN 201410787039A CN 104466816 A CN104466816 A CN 104466816A
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Abstract
The invention discloses a technology for improving electric power cable maintenance efficiency. The technology includes the steps that a damaged portion of a cable is found, an uncut wire end is polished and cleaned through abrasive cloth after a core wire insulation is cut; a cable pad core is put, a core wire is folded and rotated by a certain angle along a bearding angle of a cable original core wire and then is wrapped by sheath raw adhesive tape, a layer of glass cloth band is wound on the outer end of the diameter of the core wire after the core wire is wrapped, a layer of talcum powder is spread on the surface of a mould, and a hand wheel of a welder is screwed to enable the mould to press the cable; electrification is performed, the cable is taken out, and the appearance of the cable is dressed to be smooth; a layer of conductive adhesive tape band is wound on the outer layer of the core wire insulation, the originally shielded performance of the core wire is recovered, and the rubber is vulcanized to form maturated adhesive tape; the damaged portion of the cable is cut and repaired through an electrician knife, core wire insulation is handled, then, the damaged portion is wiped by ethyl alcohol and aired, the damaged portion is wound and repaired through the maturated adhesive tape, the middle of the damaged portion is cemented through liquid cement, and the outer layer of the cable is wound and bound up with quick-dry cloth band coated with quick-dry liquid. According to the technology, a maintenance method is improved, and maintenance efficiency is improved on the premise of guaranteeing the maintenance quality.
Description
Technical field
The present invention relates to a kind of technique, especially relating to a kind of technique based on improving electric power cable maintenance efficiency.
Background technology
The cable of at least two stranded similar ropes normally often organized by cable by several or several groups of wires, often organize mutually insulated between wire, and be often twisted into round a center cover layer that whole outside is surrounded by high-insulation.Power cable insulation will be subject to heat, chemistry and the mechanism brought with electro ultrafiltration, thus makes dielectric generation physics and chemical change, and the insulation level of medium is declined.Humidified insulation.Transition joint or terminals because of structure upper-lower seal or installation quality bad and cause humidified insulation; Leave the defect such as sand holes or crackle when manufacturing lead, cable also can be made to make moist.The reason causing cable overheated has a lot.To be that cable insulation internal air gap is free cause local heating to internal cause, thus insulation is carbonized.External cause is mounted in the cable at the places such as cable City Regions, cable tunnel, is through the cable in drying tube and the cable close with pipeline, or can dispel the heat bad because of cable overload, and make insulation accelerated damage.Mechanical damage mainly refers to the cable fault that External Force Acting causes.This, mainly due to mechanisms such as Vehicular vibrations, makes distortion of the cable.Distortion of the cable causes curved transitions, has damaged interior insulation or has caused insulating inner to produce air gap.Because electrolysis or chemical action make cable sheath corrode, because of the difference of corrosion property and degree, sheath there is the pore of redness, yellow, orange and flaxen compound or similar sponge.The stress that atmospheric over-voltage and internal overvoltage make cable insulation bear exceedes permissible value and causes and punctures.And carry out analysis to physical fault and show, many outdoor termination faults, because atmospheric over-voltage causes.During stripping semiconductor, in damaging, insulation or insulating surface have the impurity such as particulate, dust; Cable pack-off is bad, makes insulating inner have moisture, causes humidified insulation; Cable joint technique is nonstandard, seals lack of standardization, causes ground connection; Production environment humidity is bigger than normal, causes making position (cable end) insulation integrity to make moist; There is mistake in cable grounding, causes earth connection to form circulation or fracture.At power domain, cable right and wrong parts usually, maintenance personal needs regularly to carry out inspection and maintenance to cable, and its workload is large, brings very large labour intensity to operating personnel, and the efficiency of maintenance is low.
Summary of the invention
The object of the invention is to overcome above-mentioned existing maintenance process efficiency low, and workload is large, very large labour intensity is brought to operating personnel, make the affected problem of electricity consumption situation of user, devise a kind of technique based on improving electric power cable maintenance efficiency, this technique is by improving method for maintaining, under the prerequisite ensureing repair quality, improve maintenance efficiency, solve existing maintenance process efficiency low, and workload is large, brings very large labour intensity, make the affected problem of electricity consumption situation of user to operating personnel.
Object of the present invention is achieved through the following technical solutions: based on the technique improving electric power cable maintenance efficiency, comprise the following steps:
(1) find out cable failure place, prescind part sheath, expose heart yearn, whether damage and degree of injury according to cable core insulation, determine cable repairing length;
(2) according to after cable bad situation, connected mode determination cut lengths, be carried out in accordance with regulations cutting, core insulation during cutting sheath, must not be hurt, after core insulation cutting, the end of a thread emery cloth should be beaten only;
(3) by the two ends of heart yearn, connect jail by phase sequence wiring or special joint copper pipe connection method, then with scolding tin, joint is welded, when core insulation and core pad do not damage, sheath cuts into inclined-plane cone, and chamfer length and outside diameter of cable ratio are 1:2; When heart yearn is not disconnected when sheath and core insulation are damaged, after removing sheath, core insulation breakage is cut in the lump simultaneously, but can not cut off and damage heart yearn copper cash; When sheath, core insulation damages master core disconnect, answer stripper wire core insulation, core is sheared in stairstepping classification, sheared length television cable cross section core number, with nature insulating cement or rubber cloth, half-lap is wrapped, two ends grow bare wire 10-15mm, and thickness is identical with former core insulation thickness;
(4) put into cable bedding core, the angle of joining heart yearn being closed up the also former heart yearn of para-electric cable rotates an angle, with sheath rubber cloth turnkey, after wrapping, its diameter outer end wraps up one deck glass cloth tape, in case it is aging to heat, selects the pressing mold mold of spotter according to the cross-section of cable, one deck talcum powder is spread on mould tire surface, prevent viscose glue, turn spotter handwheel, make mould compress cable, energising 10-15 minute, obtain temperature and rise to 120 DEG C, during rubber sulfuration deliquescing, then rotate spotter handwheel compression once;
(5) laser heating makes temperature be raised to 140 DEG C, maintain 10-15 minute, if when cable size is larger, can some times of proper extension, but generally can not more than 30 minutes, get final product power-off, after power-off, cable is still put in a mold, in time being progressively cooled to 80-100 DEG C, taken out by cable, trimming profile makes it level and smooth;
(6) the vulcanizing of shielded type cable, should be undertaken by the hot patching process of cable, should at outer turnkey one deck conducting resinl strap of core insulation, recover its former shielding properties, cable ripe glue cold-patch method: rubber is placed in boiling water or steam and heats 40-50 minute, make the ripe adhesive tape of rubber sulfuration, electrician's knife cutting in cable failure place is repaired, handle core insulation well, again breakage alcohol is cleaned and dry, with ripe adhesive tape, damaged overcoat is wound around polishing, cementation smeared by centre glue, and skin is wrapped up with scribbling rapid-curing cutback Fabric tape winding;
(7) cold-patching tube gum smears cold-patch liquid method: cable jacket injury region electrician's knife or wood are frustrated cleaning well, the electric cable cold compensation glue prepared is spread on the damage location of cable, with Waxpaper pressing glue mend, make it to fill up substantial, and exceed damaged surface 1-2 millimeter, firm with plastic tape wrapping again, can power transmission use;
(8) test after cable maintenance: after cable maintenance, should water logging withstand voltage test be carried out, cable repairing place is immersed in the water, surface in cable two ends, connect experiment power supply with a heart yearn, the equal short circuit grounding of all the other heart yearns, the test voltage adding 1 kilovolt by the twice rated voltage of 50HZ is tested, 5 minutes duration, if cable insulation is not breakdown, it is withstand voltage qualified to be, after test, insulating resistance value is measured again, if front without significant change with test with megohmmeter; After cable maintenance, outside first water logging withstand voltage test, also current-carrying test should be carried out, during current-carrying test, cable core is connected in series, passes into long-time permissible load electric current, continue 30 minutes, maybe this place that do not generate heat, joint is no more than 3% of cable normal surface temperatures and namely thinks qualified.
Before cable uses, with the megger test of 1 kilovolt, its insulation resistance should be not less than 10 megaohms, the cable that cold-patch method is fixed, inaccurate mobile in 48 hours, measure insulation with megger after cold-patch, if insulation resistance changes not quite or when being improved, could continuing input and carry out before comparatively repairing.
In sum, the invention has the beneficial effects as follows: this technique is by improving method for maintaining, under the prerequisite ensureing repair quality, improve maintenance efficiency, solve existing maintenance process efficiency low, and workload is large, brings very large labour intensity, make the affected problem of electricity consumption situation of user to operating personnel.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment 1:
Based on the technique improving electric power cable maintenance efficiency, comprise the following steps:
(1) find out cable failure place, prescind part sheath, expose heart yearn, whether damage and degree of injury according to cable core insulation, determine cable repairing length;
(2) according to after cable bad situation, connected mode determination cut lengths, be carried out in accordance with regulations cutting, core insulation during cutting sheath, must not be hurt, after core insulation cutting, the end of a thread emery cloth should be beaten only;
(3) by the two ends of heart yearn, connect jail by phase sequence wiring or special joint copper pipe connection method, then with scolding tin, joint is welded, when core insulation and core pad do not damage, sheath cuts into inclined-plane cone, and chamfer length and outside diameter of cable ratio are 1:2; When heart yearn is not disconnected when sheath and core insulation are damaged, after removing sheath, core insulation breakage is cut in the lump simultaneously, but can not cut off and damage heart yearn copper cash; When sheath, core insulation damages master core disconnect, answer stripper wire core insulation, core is sheared in stairstepping classification, sheared length television cable cross section core number, with nature insulating cement or rubber cloth, half-lap is wrapped, two ends grow bare wire 10-15mm, and thickness is identical with former core insulation thickness;
(4) put into cable bedding core, the angle of joining heart yearn being closed up the also former heart yearn of para-electric cable rotates an angle, with sheath rubber cloth turnkey, after wrapping, its diameter outer end wraps up one deck glass cloth tape, in case it is aging to heat, selects the pressing mold mold of spotter according to the cross-section of cable, one deck talcum powder is spread on mould tire surface, prevent viscose glue, turn spotter handwheel, make mould compress cable, energising 10-15 minute, obtain temperature and rise to 120 DEG C, during rubber sulfuration deliquescing, then rotate spotter handwheel compression once;
(5) laser heating makes temperature be raised to 140 DEG C, maintain 10-15 minute, if when cable size is larger, can some times of proper extension, but generally can not more than 30 minutes, get final product power-off, after power-off, cable is still put in a mold, in time being progressively cooled to 80-100 DEG C, taken out by cable, trimming profile makes it level and smooth;
(6) the vulcanizing of shielded type cable, should be undertaken by the hot patching process of cable, should at outer turnkey one deck conducting resinl strap of core insulation, recover its former shielding properties, cable ripe glue cold-patch method: rubber is placed in boiling water or steam and heats 40-50 minute, make the ripe adhesive tape of rubber sulfuration, electrician's knife cutting in cable failure place is repaired, handle core insulation well, again breakage alcohol is cleaned and dry, with ripe adhesive tape, damaged overcoat is wound around polishing, cementation smeared by centre glue, and skin is wrapped up with scribbling rapid-curing cutback Fabric tape winding;
(7) cold-patching tube gum smears cold-patch liquid method: cable jacket injury region electrician's knife or wood are frustrated cleaning well, the electric cable cold compensation glue prepared is spread on the damage location of cable, with Waxpaper pressing glue mend, make it to fill up substantial, and exceed damaged surface 1-2 millimeter, firm with plastic tape wrapping again, can power transmission use;
(8) test after cable maintenance: after cable maintenance, should water logging withstand voltage test be carried out, cable repairing place is immersed in the water, surface in cable two ends, connect experiment power supply with a heart yearn, the equal short circuit grounding of all the other heart yearns, the test voltage adding 1 kilovolt by the twice rated voltage of 50HZ is tested, 5 minutes duration, if cable insulation is not breakdown, it is withstand voltage qualified to be, after test, insulating resistance value is measured again, if front without significant change with test with megohmmeter; After cable maintenance, outside first water logging withstand voltage test, also current-carrying test should be carried out, during current-carrying test, cable core is connected in series, passes into long-time permissible load electric current, continue 30 minutes, maybe this place that do not generate heat, joint is no more than 3% of cable normal surface temperatures and namely thinks qualified.
Before cable uses, with the megger test of 1 kilovolt, its insulation resistance should be not less than 10 megaohms, the cable that cold-patch method is fixed, inaccurate mobile in 48 hours, measure insulation with megger after cold-patch, if insulation resistance changes not quite or when being improved, could continuing input and carry out before comparatively repairing.
This technique, by improving method for maintaining, under the prerequisite ensureing repair quality, improves maintenance efficiency, solve existing maintenance process efficiency low, and workload is large, brings very large labour intensity, make the affected problem of electricity consumption situation of user to operating personnel.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention, every according to technology of the present invention, method in fact to any simple modification, equivalent variations that above embodiment is done, all fall within protection scope of the present invention.
Claims (2)
1., based on the technique improving electric power cable maintenance efficiency, it is characterized in that, comprise the following steps:
(1) find out cable failure place, prescind part sheath, expose heart yearn, whether damage and degree of injury according to cable core insulation, determine cable repairing length;
(2) according to after cable bad situation, connected mode determination cut lengths, be carried out in accordance with regulations cutting, core insulation during cutting sheath, must not be hurt, after core insulation cutting, the end of a thread emery cloth should be beaten only;
(3) by the two ends of heart yearn, connect jail by phase sequence wiring or special joint copper pipe connection method, then with scolding tin, joint is welded, when core insulation and core pad do not damage, sheath cuts into inclined-plane cone, and chamfer length and outside diameter of cable ratio are 1:2; When heart yearn is not disconnected when sheath and core insulation are damaged, after removing sheath, core insulation breakage is cut in the lump simultaneously, but can not cut off and damage heart yearn copper cash; When sheath, core insulation damages master core disconnect, answer stripper wire core insulation, core is sheared in stairstepping classification, sheared length television cable cross section core number, with nature insulating cement or rubber cloth, half-lap is wrapped, two ends grow bare wire 10-15mm, and thickness is identical with former core insulation thickness;
(4) put into cable bedding core, the angle of joining heart yearn being closed up the also former heart yearn of para-electric cable rotates an angle, with sheath rubber cloth turnkey, after wrapping, its diameter outer end wraps up one deck glass cloth tape, in case it is aging to heat, selects the pressing mold mold of spotter according to the cross-section of cable, one deck talcum powder is spread on mould tire surface, prevent viscose glue, turn spotter handwheel, make mould compress cable, energising 10-15 minute, obtain temperature and rise to 120 DEG C, during rubber sulfuration deliquescing, then rotate spotter handwheel compression once;
(5) laser heating makes temperature be raised to 140 DEG C, maintain 10-15 minute, if when cable size is larger, can some times of proper extension, but generally can not more than 30 minutes, get final product power-off, after power-off, cable is still put in a mold, in time being progressively cooled to 80-100 DEG C, taken out by cable, trimming profile makes it level and smooth;
(6) the vulcanizing of shielded type cable, should be undertaken by the hot patching process of cable, should at outer turnkey one deck conducting resinl strap of core insulation, recover its former shielding properties, cable ripe glue cold-patch method: rubber is placed in boiling water or steam and heats 40-50 minute, make the ripe adhesive tape of rubber sulfuration, electrician's knife cutting in cable failure place is repaired, handle core insulation well, again breakage alcohol is cleaned and dry, with ripe adhesive tape, damaged overcoat is wound around polishing, cementation smeared by centre glue, and skin is wrapped up with scribbling rapid-curing cutback Fabric tape winding;
(7) cold-patching tube gum smears cold-patch liquid method: cable jacket injury region electrician's knife or wood are frustrated cleaning well, the electric cable cold compensation glue prepared is spread on the damage location of cable, with Waxpaper pressing glue mend, make it to fill up substantial, and exceed damaged surface 1-2 millimeter, firm with plastic tape wrapping again, can power transmission use;
(8) test after cable maintenance: after cable maintenance, should water logging withstand voltage test be carried out, cable repairing place is immersed in the water, surface in cable two ends, connect experiment power supply with a heart yearn, the equal short circuit grounding of all the other heart yearns, the test voltage adding 1 kilovolt by the twice rated voltage of 50HZ is tested, 5 minutes duration, if cable insulation is not breakdown, it is withstand voltage qualified to be, after test, insulating resistance value is measured again, if front without significant change with test with megohmmeter; After cable maintenance, outside first water logging withstand voltage test, also current-carrying test should be carried out, during current-carrying test, cable core is connected in series, passes into long-time permissible load electric current, continue 30 minutes, maybe this place that do not generate heat, joint is no more than 3% of cable normal surface temperatures and namely thinks qualified.
2. the technique based on improving electric power cable maintenance efficiency according to claim 1, it is characterized in that: before cable uses, with the megger test of 1 kilovolt, its insulation resistance should be not less than 10 megaohms, the cable that cold-patch method is fixed, inaccurate mobile in 48 hours, measure insulation with megger after cold-patch, if insulation resistance changes not quite or when being improved, could continuing input and carry out before comparatively repairing.
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| CN201410787039.2A CN104466816A (en) | 2014-12-18 | 2014-12-18 | Technology for improving electric power cable maintenance efficiency |
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| CN201410787039.2A CN104466816A (en) | 2014-12-18 | 2014-12-18 | Technology for improving electric power cable maintenance efficiency |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105355330A (en) * | 2015-11-07 | 2016-02-24 | 南京南瑞集团公司 | Medium-voltage crosslinked cable fault repairing method |
| CN106297992A (en) * | 2016-10-26 | 2017-01-04 | 覃元子 | A kind of Graphene cable and preparation method thereof and mode of connection |
| CN106786217A (en) * | 2016-11-29 | 2017-05-31 | 中国电力科学研究院 | Distribution network cable failed terminals around packet mode emergency first-aid repair method |
| 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 |
| CN113782275A (en) * | 2020-06-10 | 2021-12-10 | 昆明电缆集团昆电工电缆有限公司 | Water-blocking method for rubber sleeve cable during vulcanization |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105355330A (en) * | 2015-11-07 | 2016-02-24 | 南京南瑞集团公司 | Medium-voltage crosslinked cable fault repairing method |
| CN106297992A (en) * | 2016-10-26 | 2017-01-04 | 覃元子 | A kind of Graphene cable and preparation method thereof and mode of connection |
| CN106297992B (en) * | 2016-10-26 | 2017-07-07 | 覃元子 | A kind of Graphene cable and preparation method thereof and mode of connection |
| CN106786217A (en) * | 2016-11-29 | 2017-05-31 | 中国电力科学研究院 | Distribution network cable failed terminals around packet mode emergency first-aid repair method |
| 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 |
| CN113782275A (en) * | 2020-06-10 | 2021-12-10 | 昆明电缆集团昆电工电缆有限公司 | Water-blocking method for rubber sleeve cable during vulcanization |
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Application publication date: 20150325 |