CN102208795A - Enhanced waterproof intermediate joint device of power cable - Google Patents
Enhanced waterproof intermediate joint device of power cable Download PDFInfo
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- CN102208795A CN102208795A CN2011100655902A CN201110065590A CN102208795A CN 102208795 A CN102208795 A CN 102208795A CN 2011100655902 A CN2011100655902 A CN 2011100655902A CN 201110065590 A CN201110065590 A CN 201110065590A CN 102208795 A CN102208795 A CN 102208795A
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- power cable
- intermediate joint
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Abstract
The invention belongs to the technical field of power cables, and in particular relates to an enhanced waterproof intermediate joint device of a power cable. Waterproof materials are added to an intermediate joint of a power cable, thus the waterproofness and the safety performance at the intermediate joint of the power cable are strengthened. The invention comprises a core and a connecting pipe; waterproof adhesives are respectively injected at two ends of the connecting pipe at the core; semiconducting tapes are wound on the connecting pipe and the waterproof adhesives externally; a shrink tube of the intermediate joint of the power cable is sleeved externally; waterproof adhesives are respectively injected at two ends of the shrink tube of the intermediate joint of the power cable; and the semiconducting tapes are externally wound on the waterproof adhesives. The enhanced waterproof intermediate joint device has the advantage that the waterproof materials are added to an intermediate joint of a power cable, thus the waterproof packing function inside the core as well as the waterproofness and the safety performance of the shrink tube of the intermediate joint of the power cable are strengthened at the intermediate joint of the power cable.
Description
Technical field
The invention belongs to the technical field of power cable, relate in particular to a kind of power cable and strengthen waterproof transition joint device.The present invention has increased waterproof material in the power cable transition joint, make the cable intermediate joint place strengthen water resistance and security performance.
Background technology
Crosslinked cable 10KV shrinkage cable intermediate joint technology in using now exists shortcoming and problem, the electric field of cable joint is a distortion electric field, cause the main cause of electric field distortion to be: when making joint, the copper shield of cable, shield semiconductors layer, insulating barrier, core all must carry out stripping, cut-off part at cable joint core and screen, can produce the electric stress concentration phenomenon, the electric field strength maximum is the weak link of whole joint.Simultaneously, if the relatively poor place of condition at the scene just unavoidably can make the joint invade impurity such as dust, gas, moisture.Thereby the main cause that takes place to puncture that causes insulating is what also needs further to analyze.
For ease of analyzing, at the scene the failure cable transition joint is amputated, dissect on the spot, find following problem:
1. the cable intermediate joint well-tended appearance and does not find the cavity of ablating;
2. find that there is tangible carbonization jet-black the inside after casting aside outer armor and adhesive waterproof tape;
3. after each phase shrinkage silicon rubber insulation sleeve pipe being cut open, wherein have two cable insulation laminar surfaces that obvious discharge carbonization passage is arranged, this passage from core until cable silicon rubber compound insulating sleeve outside.
This shows that this cable breakdown is that joint insulating surface discharge causes, illustrate that the insulation weak link that shrinkage sleeve pipe and cable insulation surface combination place exist air gap, impurity to form causes short trouble
Two cables link together, the intervalve crimping of middle core, and electric current arrives the other end by an end of cable by intervalve, and this moment, the tube connector position was the weak spot of cable.As shown in Figure 1, Fig. 1 is the structural representation of 3 core power cable medial head in the prior art.Cable is in service when being damaged, core can make moist even the core water inlet, the water that the good cable mid head of recovery this moment can be subjected to core inside flows to medial head inside, cause weak spot damage again, influenced power supply reliability, not only increase personnel's workload, but also can cause a large amount of fund losses.
As everyone knows, impurity, air gap, make moist, core water inlet is the main cause that causes the solid dielectric insulation creeping discharge, so the reason that may cause shrinkage splice insulation to puncture has following several respects, promptly manufacture craft is laid environment and outside destroy.
Aspect manufacture craft, may there be following reason
1. during stripping cable shield semiconductors layer, tool marks are dark excessively, make the main insulating layer surface that scar be arranged, and have air gap easily.
2. after the stripping of cable shield semiconductors layer, do not remove totally, its semiconductor remains on the main insulating layer, or does not follow technological requirement when wiping clearly, cleans back and forth, stays hidden danger, produces the flashover discharge.
3. after the cable core crimping, the distortion of tube connector load mould has tip, corner angle, causes electric field distortion, and local field strength is concentrated, and produces point discharge.
4. the shrinkage silicone rubber sleeve is pre-formed annex, and the intervalve that core connects, shrinkage intervalve shrink and closely can not guarantee outside pressure, causes impurity to be invaded, gas enters, make moist, water inlet even inundation.
When 5. making this shrinkage, after the silicon rubber insulation sleeve pipe shrank, two-port was not made any encapsulation process, and this is the major reason that causes moisture to be invaded.
When 6. making the shrinkage joint, the three characteristics of the middle term shrinkage insulating sleeve center that coexists because out-of-flatness holds and has fold in the water blocking tape, causes looping not tight, and this also is one of major reason that causes the joint watered and wetting.
7. the off size recovery that accommodates copper shield of shield semiconductors cutting is not in place is the main cause that causes short trouble.
Below 1., 2., 3., 6., 7. artificial origin when making, 4., 5. then be because the shrinkage joint lacks the outer protection performance to be made outside the weak spot of shrinkage joint is exposed to, have fail safe hidden danger.
Summary of the invention
The present invention is directed to above-mentioned problems of the prior art, provide a kind of power cable to strengthen waterproof transition joint device.
The present invention realizes that the technical scheme of the purpose of inventing is as follows:
Power cable strengthens waterproof transition joint device, and it comprises core and tube connector; It is a marine glue of annotating respectively at the two ends of core place tube connector, and semiconductor tape, outside suit cable mid head cold shrink tube are twined in tube connector and marine glue outside; A marine glue of annotating respectively at the two ends of cable mid head cold shrink tube is wound with semiconductor tape in the marine glue outside.
Described semiconductor tape twines 2 layers with the method for overlap joint 50%.
Advantage of the present invention is to have increased waterproof material in the power cable transition joint, makes the cable intermediate joint place strengthen core interior waterproof sealing function and outside water-proof function of cable mid head cold shrink tube and security performance.The present invention has been owing to increased by 2 marine glues at the two ends of core place intermediate connection tube, and twines semiconductor tape at tube connector and marine glue outside, increased the waterproof sealing of core insulator place and cable mid head cold shrink tube.Owing to after the cable mid head cold shrink tube puts, do encapsulation process in two-port, be equipped with marine glue again at two ends again, semiconductor tape is twined in the marine glue outer end.Increased the water-proof function of cable mid head cold shrink tube outside so again, isolated that impurity intrusion, gas enter, make moist, water inlet even inundation.Make power cable transition joint place strengthen the outer protection performance, and security performance also is significantly improved.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is the structural representation of 3 core power cable medial head in the prior art;
Fig. 2 is a core interior waterproof structural representation of the present invention;
Fig. 3 is the outer section waterproof structure schematic diagram of shrinkage medial head cold shrink tube of the present invention.
Among the figure: oversheath 1, steel armour 2, inner sheath 3, copper shield 4, semi-conductive layer 5, main insulating layer 6, tube connector 7, core 8, semiconductor tape 9, marine glue 10, cable mid head cold shrink tube 11.
Embodiment
As Fig. 2, shown in Figure 3, Fig. 2 is a core interior waterproof structural representation; Fig. 2 is a core interior waterproof structural representation of the present invention; Fig. 3 is the outer section waterproof structure schematic diagram of shrinkage medial head of the present invention.
The present invention is that a kind of power cable strengthens waterproof transition joint device.It is 2 marine glues of annotating respectively at the two ends of core 8 place's tube connectors 7, and semiconductor tape 9 is twined in tube connector 7 and marine glue 10 outsides; Outside suit cable mid head cold shrink tube 11; 2 marine glues 10 of annotating respectively at the two ends of cable mid head cold shrink tube 11 are wound with semiconductor tape 9 in marine glue 10 outsides.
When two cables linked together, middle core arrived the other end by an end of cable by intermediate connection tube 7 with intermediate connection tube 7 crimping, electric current, and this moment, tube connector 7 positions were the weak spot of cable.The present invention is 2 marine glues of having annotated respectively at the two ends of these weak spot core 8 place's intermediate connection tubes 7, and twines semiconductor tape 9 at tube connector 7 and marine glue 10 outsides, twines 2 layers with the method for overlap joint 50%; As shown in Figure 2, it is in order to increase the tightness that is connected of marine glue 10 and core 8 and tube connector 7 that tube connector 7 twines semiconductor tapes 9, and can also to make tube connector 7 and silicon rubber insulation sleeve pipe cable mid head cold shrink tube 11 be that contact is closely between the medial head main body, reduced the degree of danger of power cable weak spot, security performance is significantly improved.
Again cable mid head cold shrink tube 11 is put afterwards, as shown in Figure 3.Add marine glue 10 at cable mid head cold shrink tube 11 two ends, semiconductor tape 9 is twined in marine glue 10 outer ends, twines 2 layers with the method for overlap joint 50%.Increase cable mid head main body cable mid head cold shrink tube 11 and the marine glue tightness that contacts core 8 places, in order to prevent that cable mid head main body cable mid head cold shrink tube 11 outer end moisture from entering core inside, reduced the danger of medial head core 8 weak spots again.
Claims (2)
1. power cable strengthens waterproof transition joint device, and it comprises core (8) and tube connector (7); It is characterized in that: (2) the individual marine glue of annotating respectively at the two ends that core (8) is located tube connector (7), semiconductor tape (9), outside suit cable mid head cold shrink tube (11) are twined in tube connector (7) and marine glue (10) outside; (2) the individual marine glue (10) of annotating respectively at the two ends of cable mid head cold shrink tube (11) is wound with semiconductor tape (9) in marine glue (10) outside.
2. power cable according to claim 1 strengthens waterproof transition joint device, it is characterized in that: described semiconductor tape (9) twines 2 layers with the method for overlap joint 50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100655902A CN102208795A (en) | 2011-03-18 | 2011-03-18 | Enhanced waterproof intermediate joint device of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100655902A CN102208795A (en) | 2011-03-18 | 2011-03-18 | Enhanced waterproof intermediate joint device of power cable |
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| Publication Number | Publication Date |
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| CN102208795A true CN102208795A (en) | 2011-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100655902A Pending CN102208795A (en) | 2011-03-18 | 2011-03-18 | Enhanced waterproof intermediate joint device of power cable |
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| Country | Link |
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| CN (1) | CN102208795A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337813A (en) * | 2013-05-30 | 2013-10-02 | 国家电网公司 | Low-voltage cable intermediate joint cold contraction technology |
| CN110429521A (en) * | 2019-08-28 | 2019-11-08 | 长缆电工科技股份有限公司 | A kind of waterproof sealing method of transition joint |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4466843A (en) * | 1981-06-08 | 1984-08-21 | Raychem Corporation | Protection of cable splice |
| JPH1169594A (en) * | 1997-08-07 | 1999-03-09 | Hitachi Cable Ltd | Insulated wire room-temperature heat shrinkable cover |
| CN1214808A (en) * | 1996-04-15 | 1999-04-21 | 塞尔帕克有限责任公司 | Electric cable connection |
| CN200973011Y (en) * | 2006-11-13 | 2007-11-07 | 深圳市长园新材料股份有限公司 | Heat-shrinkable cable joint structure |
| CN201001021Y (en) * | 2007-01-26 | 2008-01-02 | 蔡宝江 | Cool-shrinking joint dedicated for airport navigation-aid lamplight crosslinked cable |
| CN201378723Y (en) * | 2009-03-19 | 2010-01-06 | 泉州七星电气有限公司 | Cable docking mechanism |
| CN202026070U (en) * | 2011-03-18 | 2011-11-02 | 辽宁省电力有限公司沈阳供电公司 | Power cable intermediate joint device capable of improving waterproof ability |
-
2011
- 2011-03-18 CN CN2011100655902A patent/CN102208795A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4466843A (en) * | 1981-06-08 | 1984-08-21 | Raychem Corporation | Protection of cable splice |
| CN1214808A (en) * | 1996-04-15 | 1999-04-21 | 塞尔帕克有限责任公司 | Electric cable connection |
| JPH1169594A (en) * | 1997-08-07 | 1999-03-09 | Hitachi Cable Ltd | Insulated wire room-temperature heat shrinkable cover |
| CN200973011Y (en) * | 2006-11-13 | 2007-11-07 | 深圳市长园新材料股份有限公司 | Heat-shrinkable cable joint structure |
| CN201001021Y (en) * | 2007-01-26 | 2008-01-02 | 蔡宝江 | Cool-shrinking joint dedicated for airport navigation-aid lamplight crosslinked cable |
| CN201378723Y (en) * | 2009-03-19 | 2010-01-06 | 泉州七星电气有限公司 | Cable docking mechanism |
| CN202026070U (en) * | 2011-03-18 | 2011-11-02 | 辽宁省电力有限公司沈阳供电公司 | Power cable intermediate joint device capable of improving waterproof ability |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103337813A (en) * | 2013-05-30 | 2013-10-02 | 国家电网公司 | Low-voltage cable intermediate joint cold contraction technology |
| CN103337813B (en) * | 2013-05-30 | 2016-03-30 | 国家电网公司 | Low-voltage cable intermediate joint cold contraction technology |
| CN110429521A (en) * | 2019-08-28 | 2019-11-08 | 长缆电工科技股份有限公司 | A kind of waterproof sealing method of transition joint |
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| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20121009 |
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Effective date of registration: 20121009 Address after: 110811 eight Heping Street, 94 Heping Street, Liaoning, Shenyang Applicant after: Liaoning Shenyang Electric Power Supply Co., Ltd. Applicant after: State Grid Corporation of China Address before: 110811 eight Heping Street, 94 Heping Street, Liaoning, Shenyang Applicant before: Liaoning Shenyang Electric Power Supply Co., Ltd. |
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Application publication date: 20111005 |