CN202602234U - Medium-pressure cross-linked polyethylene cable terminal with insulation stress cone - Google Patents
Medium-pressure cross-linked polyethylene cable terminal with insulation stress cone Download PDFInfo
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- CN202602234U CN202602234U CN201220282352.7U CN201220282352U CN202602234U CN 202602234 U CN202602234 U CN 202602234U CN 201220282352 U CN201220282352 U CN 201220282352U CN 202602234 U CN202602234 U CN 202602234U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The utility model relates to a medium-pressure cross-linked polyethylene cable terminal with an insulation stress cone. The cable terminal comprises a branched sleeve, a sealed pipe, a conducting wire core, an inner shielding layer, a main insulation layer, a semiconducting layer, a copper band shielding layer and a rubber semiconducting layer and is characterized in that a polyvinyl chloride plastic band wraps a part between the front of a cutting opening of the semiconducting layer and the rear side of the stop end of the semiconducting layer, and the wrapped part forms the insulation stress cone; the outline dimension of a part of the insulation stress cone, which corresponds to the cutting opening of the semiconducting layer, is the largest; the rubber semiconducting band wraps a part between the part of the insulation stress cone, which has the largest outline dimension, and the bottom of a cable; an insulation stress cone body consists of the insulation stress cone and the rubber semiconducting band; and an insulation protective casing is sleeved outside the insulation stress cone body. A coronal inception voltage value of the cable terminal can be increased effectively, the inner corona in the operation of the cable terminal can be eliminated, the accident rate of a medium-pressure cross-linked polyethylene cable is reduced, the safety and the reliability of the cable are improved, and the medium-pressure cross-linked polyethylene cable terminal with the insulation stress cone can also be applied to a cable intermediate connector.
Description
Technical field
The utility model belongs to the cable technology field, particularly relates to a kind of middle crosslinked polyetylene insulated stress cone cable terminal of pressing.
Background technology
Electric power system is called 6～35kV electric pressure " middle pressure "." medium voltage network " refers to that electric pressure is electrical network or the electric power system of 6～35kV.No matter domestic and international, middle pressure crosslinked polyethylene (XLPE) power cable is widely used in transmitting electric energy.When using twisted polyethylene cable, the two ends of cable must make cable terminal; When adopting the long distance of cable to transmit electric energy, need 2 or many cables be coupled together, and two cables that will be adjacent connect, and need the making cable intermediate joint.
Twisted polyethylene cable and rubber cable are the maximum power cables of present electric power system use amount, are the novel insulated power cable of representative with the crosslinked polyethylene plastic particularly, have the manufacturing, install and lay simple and convenient; Receive the influence of environment drop little, dielectric coefficient is high, and is reliable; Dielectric loss is minimum, and working temperature is high, and ampacity is big; Twisted polyethylene cable circuit floor space is little, can adopt system of layings such as the underground or poling of direct-burried, compares with overhead transmission line; Small to pedestrian, building and communications service interference, safeguard simply the operational reliability advantages of higher.Twisted polyethylene cable and rubber cable are compared maximum advantage with oil-filled paper insulated cable: because there is not oil, low the filling or the height work of knocking off that it is in service not to have an oil pressure need do not carried out continual supervision to oil pressure yet; Because there is not oil, and cable insulation material intensity is high, and cable laying operation property is good, and the environmental adaptation scope is wide, is best suited for high drop place; Because there is not oil, cable is lower to the requirement of sealing, and cable main insulation is made moist dangerous low.
Power cable comprises twisted polyethylene cable, is to carry equipment than safe electric energy.Most of cable body accidents are outside destroy or environmental hazard and cause accident to have an accident, and under the normal condition, midium voltage cable is owing to the probability that the body quality problems break down is extremely low.But press the twisted polyethylene cable accident to take place frequently in recent years, the accident great majority occur on cable terminal or the cable intermediate joint, and accident causes the cable scaling loss, cause cable to shorten and scrap.Some cable fault not only causes the scaling loss of cable own, and the electric arc that cable short circuit causes also can feed through to electric equipments such as the transformer that is connected with cable, switch cubicle.The cable scaling loss causes electric power enterprise to user's power failure, the accident of rationing the power supply; Production, work and the life order of power consumer have been seriously influenced.
Cause the factor of twisted polyethylene cable terminals or cable intermediate joint accident a lot, wherein improper just wherein one of the reason of bad, the cable laying installation method of the manufacture craft of cable terminal or cable intermediate joint.Middle twisted polyethylene cable manufacturer or the electric cable accessories manufacturer of pressing; The cable that provides, electric cable accessories and supplementary material defectiveness; Perhaps there is defective in the supporting manufacturing cable head technological specification that provides of annex manufactory, causes the insulation system of cable end unreasonable, can not satisfy the normal operation under the rated voltage; Cable end is in operation, and insulation fault takes place is the probability of cable single-phase earthing, will increase greatly.
The inventor thinks: the twisted polyethylene cable head is in operation, cable main insulation under the high field power effect of semi-conductive layer sectility mouth place, produce corona, corona discharge spark cause the main insulating layer dielectric strength to reduce then the insulation breakdown discharge is the immediate cause that cable fault takes place frequently.Basic principle and forming process analysis that the cause of cable end accident and accident are shaped are following:
Existing twisted polyethylene cable terminals have two kinds of process for making: a kind of is cable terminal pyrocondensation manufacture craft standard; A kind of is cable terminal shrinkage manufacture craft standard; These two kinds of cable terminal process for making are similar at present, all exist the insulation system defective.
Must " cut open stripping " according to each given size during manufacturing cable head; Cable " cuts open envelope " semi-conductive layer sectility mouth and the insulating barrier joint portion electric field distortion that is in operation; Produce dangerous electric field tangential component and axial component; The electric field strength that causes cable main insulation to bear improves 10～20 times, and the free voltage at cable sectility mouth place reduces, and causes cable sectility mouth place to produce corona.Corona is for a long time at the faint electric spark of cable insulation and the generation of sectility mouth place and tens of degree that on the cable end operating temperature, superpose.Under the effect of corona spark and corona high temperature (referring to that the corona temperature is higher than other position temperature of insulating barrier), insulating barrier crosslinked polyethylene plastic material is deterioration gradually for a long time for cable end; Dielectric loss increases; Leakage current increases; Finally cause the cable end dielectric strength to reduce; Semi-conductive layer sectility mouth place main insulation broken down under working voltage causes the cable core conductor arc discharge is taken place semi-conductive layer (grounded part), causes twisted polyethylene cable generation single-phase earthing accident.If protective relaying device can not excise the fault point early, the cable end that has an accident can develop under the effect of single-phase earthing electric arc and electric network fault electric current, voltage expands as heterogeneous short circuit accident.
The manufacture method of cable pyrocondensation transition joint is similar with cable pyrocondensation terminals.With cable pyrocondensation terminals is example, introduces cable end accident cause and restorative procedure." the parametric type insulation system " that adopts is that twisted polyethylene cable generally adopts the method that slackens high field at present.It is market purchasing cable assembly head pyrocondensation annex; Cut stripping cable cover(ing), armouring, screen and main insulation etc. according to the supporting technological specification that provides of annex manufacturer; With the stress control tube of corresponding specification, insulated tube, branch spider etc., be sleeved on the end of copper shield, pyrocondensation shaping etc. then.
The critical piece that present cable end slackens the high field employing is stress control tube (an abbreviation stress tube), and stress tube has two types.A kind of is nonlinear resistance material plastic tube (being commonly called as the semiconductor stresses pipe), and a kind of is high dielectric constant material plastic tube (being commonly called as the insulation stress pipe).Two kinds of stress tube installation positions are identical, all at sectility mouth place.Stress tube thickness is very little, for about 1mm.The fact of a large amount of cable sectility mouth corona spots shows; Use complete " pyrocondensation electric cable accessories " and technological specification thereof; Lose control of " distortion field intensity " that cable end and transition joint place are higher than 10～20 times of normal field intensity; Caused the unreasonable of insulation system here, slackened its built-in electrical insulation intensity, operation stays hidden danger to cable.
The utility model content
The technical problem that the utility model will solve is to provide a kind of good insulation preformance, the crosslinked polyetylene insulated stress cone cable terminal of middle pressure that the cable security performance is good.
The technical scheme of the utility model is: press crosslinked polyetylene insulated stress cone cable terminal in a kind of, comprise the branch spider, sealed tube; Conductor wire core, internal shield, main insulating layer; Semi-conductive layer; The copper strips screen, the rubber semi-conductive layer is characterized in that: semi-conductive layer sectility mouth front (front is meant the direction that is distal to the branch spider) to semi-conductive layer looping between end back (back is meant the direction that is bordering on the branch spider) has the polyvinyl chloride plastic strip; The polyvinyl chloride plastic strip of looping constitutes the insulation stress awl; The insulation stress awl overall dimension of the position corresponding with semi-conductive layer sectility mouth is maximum, and insulation stress awl overall dimension maximum is surrounded with the rubber semi-conductive tape to the cable root, and the insulation stress awl is formed the insulation stress cone with the rubber semi-conductive tape.
Insulation stress cone outside suit insulating sleeve pipe.
The polyvinyl chloride plastic strip of looping is initial to cable terminal direction half-lap from semi-conductive layer sectility mouth; Half-lap is meant that the second circle polyvinyl chloride plastic strip is with the overlapping looping of half width of first lap polyvinyl chloride plastic strip; The 3rd circle polyvinyl chloride plastic strip is with the overlapping looping of second circle polyvinyl chloride plastic half width of strip, by that analogy.
Insulation stress awl overall dimension maximum is surrounded with two-layer rubber semi-conductive tape to cable root half is overlapping, and insulation stress awl overall dimension maximum is a half-lap to the rubber semi-conductive tape that the cable root holds.
The appearance similar peckled turnip of insulation stress awl, the cable root end is equivalent to the root tail of peckled turnip, and the cable terminal end is equivalent to the head of peckled turnip, is exactly the position of frondesce.
The polyvinyl chloride plastic strip is water white transparency polyvinyl chloride plastic strip preferably; The rubber semi-conductive tape is the ethylene-propylene rubber semi-conductive tape.
During making, the rubber semi-conductive tape must with the semi-conductive layer at cable sectility mouth place and the copper strips screen covers and with its reliable connection, make insulation stress awl profile satisfy the requirement of cable sectility mouth place electromagnetic stress field shape; Insulation stress awl has increased the thickness of the strength of cable electric field stress main insulation, makes insulation stress awl profile and the size all satisfy the requirement of cable operation electric field strength.
The utility model can effectively improve " discharge inception voltage " value of cable terminal, eliminates the operating inside of cable terminal " corona ", presses the twisted polyethylene cable rate of failure in the reduction, improves the fail safe and the reliability of cable.
The utility model can be used for cable intermediate joint equally; The utility model difference with the prior art is: the stress tube that replaces prior art with the insulation stress awl cable end of the utility model.
Middle pressure twisted polyethylene cable terminals through with crosslinked polyetylene insulated stress cone cable terminal of the middle pressure of the utility model and prior art stress tube have carried out the contrast experiment; The result shows; Under 21.75kV/5 minute test standard of identical test voltage, wrapped stress cone is the corona intensity that the corona intensity of the middle pressure twisted polyethylene cable terminals of the utility model is starkly lower than suit stress tube cable end; Under the equal experimental condition, the cable discharge inception voltage value of middle pressure twisted polyethylene cable terminals is 16KV, and the cable discharge inception voltage value of suit stress tube cable end is 9KV.Add stress cone so press the twisted polyethylene cable terminals in present stage as if changing, can yet be regarded as and avoid the effective measures of cable end accident.
Description of drawings
Press the sketch map of crosslinked polyetylene insulated stress cone cable terminal in Fig. 1 the utility model,
Fig. 2 is the structural representation that prior art installs the cable terminal of stress tube additional.
Among the figure: 1-insulation stress awl, 2-main insulating layer, 3-semi-conductive layer, 4-copper strips screen; 5-conductor wire core, 6-internal shield, 7-rubber semi-conductive tape, 8-minute spider; 9-stress tube, 10-insulating sleeve pipe, 11-sealed tube, 12-semi-conductive layer sectility mouth; 13-semi-conductive layer is by end, and L1-insulation stress awl shields conical surface length, and L2-insulation stress awl is gone up segment length.
Embodiment
The crosslinked polyetylene insulated stress cone cable terminal of middle pressure comprises branch spider 8, sealed tube 11; Conductor wire core 5, internal shield 6, main insulating layer 2; Semi-conductive layer 3, copper strips screen 4, rubber semi-conductive layer 7; It is characterized in that: semi-conductive layer sectility mouth 12 fronts to semi-conductive layer looping between end 13 back has the polyvinyl chloride plastic strip, and the polyvinyl chloride plastic strip of looping constitutes insulation stress awl 1, and the insulation stress of the position corresponding with semi-conductive layer sectility mouth 13 is bored 1 overall dimension maximum; Insulation stress is bored 1 overall dimension maximum and is surrounded with rubber semi-conductive tape 7 to the cable root, and insulation stress awl 1 is formed the insulation stress cone with rubber semi-conductive tape 7.
In order to protect insulation stress awl cable end and heavy insulation effect, the front and rear sections outside suit insulating sleeve pipe 10 of insulation stress cone outside and insulation stress cone.
The polyvinyl chloride plastic strip of looping is initial to cable terminal direction half-lap from semi-conductive layer sectility mouth 12; Half-lap is meant that the second circle polyvinyl chloride plastic strip is with the overlapping looping of half width of first lap polyvinyl chloride plastic strip; The 3rd circle polyvinyl chloride plastic strip is with the overlapping looping of second circle polyvinyl chloride plastic half width of strip, by that analogy.
Insulation stress is bored 1 overall dimension maximum and is surrounded by two-layer rubber semi-conductive tape 7 to cable root half-lap, and it is half-laps to the wrapped rubber semi-conductive tape 7 of cable root that insulation stress is bored 1 overall dimension maximum.
The appearance similar peckled turnip of insulation stress awl 1.
The polyvinyl chloride plastic strip is water white transparency polyvinyl chloride plastic strip preferably; Rubber semi-conductive tape 7 is ethylene-propylene rubber semi-conductive tapes.
Cable insulation stress cone epimere length L 1 is 60mm～90mm, and insulation stress awl shielding conical surface length L 2 is 90mm～140mm, and insulation stress awl cable end thick diameter is than the big 16mm～30mm of main insulating layer diameter.
Claims (4)
1. press crosslinked polyetylene insulated stress cone cable terminal in one kind, comprise the branch spider, sealed tube; Conductor wire core, internal shield, main insulating layer; Semi-conductive layer; The copper strips screen, the rubber semi-conductive layer is characterized in that: semi-conductive layer sectility mouth (12) front to semi-conductive layer looping between end (13) back has the polyvinyl chloride plastic strip; The polyvinyl chloride plastic strip of looping constitutes insulation stress awl (1); Insulation stress awl (1) overall dimension of the position corresponding with semi-conductive layer sectility mouth (13) is maximum, and insulation stress awl (1) overall dimension maximum is surrounded with rubber semi-conductive tape (7) to the cable root, and insulation stress awl (1) is formed the insulation stress cone with rubber semi-conductive tape (7).
2. a kind of middle crosslinked polyetylene insulated stress cone cable terminal of pressing as claimed in claim 1 is characterized in that: the front and rear sections outside suit insulating sleeve pipe (10) of insulation stress cone outside and insulation stress cone.
3. press crosslinked polyetylene insulated stress cone cable terminal among according to claim 1 or claim 2 a kind of; It is characterized in that: segment length on the cable insulation stress cone (L2) is 60mm～90mm; Insulation stress awl shielding conical surface length (L1) is 90mm～140mm, and insulation stress awl cable end thick diameter is than the big 16mm～30mm of main insulating layer diameter.
4. a kind of middle crosslinked polyetylene insulated stress cone cable terminal of pressing as claimed in claim 3, it is characterized in that: the polyvinyl chloride plastic strip is water white transparency polyvinyl chloride plastic strip preferably; Rubber semi-conductive tape (7) is the ethylene-propylene rubber semi-conductive tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220282352.7U CN202602234U (en) | 2012-06-15 | 2012-06-15 | Medium-pressure cross-linked polyethylene cable terminal with insulation stress cone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220282352.7U CN202602234U (en) | 2012-06-15 | 2012-06-15 | Medium-pressure cross-linked polyethylene cable terminal with insulation stress cone |
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| Publication Number | Publication Date |
|---|---|
| CN202602234U true CN202602234U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220282352.7U Expired - Lifetime CN202602234U (en) | 2012-06-15 | 2012-06-15 | Medium-pressure cross-linked polyethylene cable terminal with insulation stress cone |
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| CN (1) | CN202602234U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709866A (en) * | 2012-06-15 | 2012-10-03 | 甘肃省电力公司刘家峡水电厂 | Medium-voltage crosslinking polyethylene insulation stress cone cable terminal and repair method |
| CN106025998A (en) * | 2016-07-25 | 2016-10-12 | 常州市拓源电缆成套有限公司 | Wear resistant outdoor cable terminal for railways |
| CN106785808A (en) * | 2016-11-29 | 2017-05-31 | 中国电力科学研究院 | Cold-contraction type stress cast cable termination grip force reinforcement means |
-
2012
- 2012-06-15 CN CN201220282352.7U patent/CN202602234U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102709866A (en) * | 2012-06-15 | 2012-10-03 | 甘肃省电力公司刘家峡水电厂 | Medium-voltage crosslinking polyethylene insulation stress cone cable terminal and repair method |
| CN106025998A (en) * | 2016-07-25 | 2016-10-12 | 常州市拓源电缆成套有限公司 | Wear resistant outdoor cable terminal for railways |
| CN106785808A (en) * | 2016-11-29 | 2017-05-31 | 中国电力科学研究院 | Cold-contraction type stress cast cable termination grip force reinforcement means |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: LIUJIAXIA HYDRAULIC POWER PLANT, STATE GRID GANSU ELECTRIC POWER COMPANY Effective date: 20140326 Owner name: LIUJIAXIA HYDRAULIC POWER PLANT, STATE GRID GANSU Effective date: 20140326 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| C56 | Change in the name or address of the patentee |
Owner name: LIUJIAXIA HYDRAULIC POWER PLANT, STATE GRID GANSU Free format text: FORMER NAME: GANSU ELECTRIC POWER CORPORATION, LIUJIAXIA HYDROPOWER PLANT |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 731600 LINXIA HUI AUTONOMOUS PREFECTURE, GANSU PROVINCE TO: 100031 XICHENG,BEIJING |
|
| CP03 | Change of name, title or address |
Address after: Sichuan Road 731600 in Gansu County of Yongjing province Liujiaxia town No. 13 Patentee after: LIUJIAXIA HYDROPOWER PLANT, STATE GRID GANSU PROVINCE ELECTRIC POWER CO. Address before: Sichuan Road 731600 in Gansu Hui Autonomous Prefecture of Linxia province Yongjing County Liujiaxia town No. 13 Patentee before: Liujiaxia Hydropower Plant, Gansu Electric Power Corp. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20140326 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: LIUJIAXIA HYDROPOWER PLANT, STATE GRID GANSU PROVINCE ELECTRIC POWER CO. Address before: Sichuan Road 731600 in Gansu County of Yongjing province Liujiaxia town No. 13 Patentee before: LIUJIAXIA HYDROPOWER PLANT, STATE GRID GANSU PROVINCE ELECTRIC POWER CO. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20121212 Effective date of abandoning: 20150826 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20121212 Effective date of abandoning: 20150826 |
|
| RGAV | Abandon patent right to avoid regrant |