CN209168814U - A kind of cross-linked polyethylene insulated cable terminal structure - Google Patents
A kind of cross-linked polyethylene insulated cable terminal structure Download PDFInfo
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- CN209168814U CN209168814U CN201920040145.2U CN201920040145U CN209168814U CN 209168814 U CN209168814 U CN 209168814U CN 201920040145 U CN201920040145 U CN 201920040145U CN 209168814 U CN209168814 U CN 209168814U
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Abstract
The utility model discloses a kind of cross-linked polyethylene insulated cable terminal structures, the structure includes cable main body, the cable main body includes the copper shield being set to outside conductor and the armor that is set to outside the copper shield, the copper shield and armor are individually drawn with stranded conductor respectively, form two piece-root grafting ground wires, it is insulated from each other between two ground lines.The structure may insure cable testing and detection work easily and effectively, armor, copper shield are individually drawn ground connection, pass through structure provided by the present application, due to copper shield and armor independent grounding, therefore in later period test, independent resistance test may be implemented, from the realization more accurately independent detection to each layer of performance condition.It to realize that the detection project detection of the overall preventative test of cable lays a good foundation, while being also daily maintenance, breakdown judge advantage.
Description
Technical field
The utility model relates to cable operation fault detection technique fields, more particularly to a kind of crosslinked polyetylene insulated electricity
Cable terminal structure.
Background technique
Cross-linked polyethylene insulated cable is a kind of cable suitable for fields such as power distribution networks, has PVC insulated cable can not
The advantages of analogy.Its structure it is simple, light-weight, heat-resisting it is good, load capacity is strong, non-fusible, resistant to chemical etching, high mechanical strength,
With electric power, the development of energy industry, various cables apply to the every field of production and living more and more, and generally all
It is embedded to underground or enters cable duct and lay, after cable breaks down, how fast and accurately to search fault point, restore to supply as early as possible
Electricity is our problem of long-standing problem.
Cross-linked polyethylene insulated cable be suitable for power distribution network, commercial plant or other need large capacity electrical domain, be used for
Fixation is laid in the electrical power distribution electric line for exchanging 50Hz, voltage rating 6kV~35kV, and major function is conveying electric energy.Fortune
Cable in row needs the electrical test made: cable fault can be summarized as ground connection, short circuit, broken string three classes, and fault type is main
There are following several respects:
1, one core of three-core cable or two cores ground connection.
2, two-phase core short-circuit between conductors.
3, three-phase core wire dead short.
4, phase core wire broken string or multiphase broken string.
The above failure there are the main reason for have: cable because external force damages, the humidified insulation of cable, occur chemistry reflection,
Long-term running overload, cable and cable accessory the factors such as can't meet the quality requirement caused by.
It is provided according to DL/596-1996 " power equipment preventive trial regulation ", running cable does not do DC break down voltage
It tests but uses following test method:
(1) cable major insulation insulation resistance test；(2) cable jacket insulation resistance test；(3) cable liner layer insulate
Resistance test；(4) the ratio between copper shield D.C. resistance and conductor DC resistance are tested.
But present crosslinked cable is welded together using copper shield and armor draws the ground wire grounded method of a piece-root grafting, adopts
With conventional test method, it is impossible to realize the test of above-mentioned project, then, only once major insulation is exhausted for telemetering for preventive trial
Edge resistance can not test other parameters.
Utility model content
The utility model provides a kind of cross-linked polyethylene insulated cable terminal structure.
The utility model provides following scheme:
A kind of cross-linked polyethylene insulated cable terminal structure, comprising:
Cable main body, the cable main body include the copper shield being set to outside conductor and are set to the copper shield
Outer armor, the copper shield and armor are individually drawn with stranded conductor respectively, form two piece-root grafting ground wires, two institutes
It states insulated from each other between ground line；
Wherein, the section of the copper shield ground line is not less than 25mm2, the section of the armor ground line is not less than
10mm2。
It is preferred: to further include the cable connector being set in the cable main body, the cable connector is for realizing described
Cable main body is connected with another cable main body；The ground line of the inside shielded layer that the cable connector includes and the armor it
Between be provided with insulating layer so as to the separation both realized.
Preferred: the armor ground line is grounded with another armature of cable layer for being located at the cable connector other end
Line is electrically connected by conducting wire.
Preferred: the cable main body includes the first outer jointing jacket, and the armor ground line is external to be provided with outside second
Protective case；Second outer jointing jacket and first outer jointing jacket insulation having the same and sealing performance, outside described first
Protective case and second outer jointing jacket overlap.
It is preferred: the cable main body include the first liner layer, the cable connector include the second liner layer, described first
Liner layer and second liner layer overlap.
It is preferred: to include more conductors, the copper shield being independently arranged for including in the cable main body outside every conductor
Layer is individually drawn by stranded conductor respectively forms a plurality of copper shield ground line, between a plurality of copper shield ground line each other absolutely
Edge.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects:
By the utility model, a kind of cross-linked polyethylene insulated cable terminal structure may be implemented, in a kind of implementation
Under, which may include cable main body, and the cable main body includes the copper shield being set to outside conductor and is set to institute
The armor outside copper shield is stated, the copper shield and armor are individually drawn with stranded conductor respectively, form two piece-root graftings
Ground wire, it is insulated from each other between two ground lines；Wherein, the section of the copper shield ground line is not less than 25mm2, described
The section of armor ground line is not less than 10mm2.The structure may insure cable testing and detection work easily and effectively, armouring
Layer, copper shield individually draw ground connection, due to copper shield and armor independent grounding, in later period test, Ke Yishi
Now independent resistance test, from the realization more accurately independent detection to each layer of performance condition.For running D.C. resistance
The status being unable to test, propose serial cable core wire, be just the DC resistance of individual cord the numerical value measured divided by 2,
Reference is provided for cable fault judgement, by the technological improvement of the above two o'clock, for the inspection of the overall preventative test of realization cable
It surveys item detection to lay a good foundation, while being also daily maintenance, breakdown judge advantage, have in practical applications very well
Reference value.
Certainly, any product for implementing the utility model does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is a kind of schematic diagram of cross-linked polyethylene insulated cable terminal structure provided by the embodiment of the utility model；
Fig. 2 is cable D.C. resistance test schematic diagram provided by the embodiment of the utility model；
Fig. 3 is insulating resistance of cable test schematic diagram provided by the embodiment of the utility model.
In figure: cable main body 1, conductor 2, armor 3, copper shield 4, stranded conductor 5.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art's every other embodiment obtained, all belongs to
In the range of the utility model protection.
Cross-linked polyethylene insulated cable property and advantage and disadvantage provided by the present application:
The method that cross-linked polyethylene insulated cable uses peroxide crosslinking, becomes polyethylene molecule by linear molecular structure
For tridimensional network, thermosetting material is become by thermoplastic material, operating temperature is increased to 90 DEG C from 70 DEG C, significantly improves electricity
The current-carrying capability of cable.It has the advantage that
1, heat resistance: the XLPE of netted stereochemical structure has very excellent heat resistance.It will not divide at 300 DEG C or less
Solution and carbonization, long-term operating temperature is up to 90 DEG C, and the thermal life was up to 40 years.
2, insulation performance: XLPE maintains the original good insulation characteristic of PE, and insulation resistance further increases.Its medium
Loss tangent very little, and be affected by temperature less.
3, mechanical property: due to establishing new chemical bond between macromolecular, the hardness of XLPE, rigidity, wearability and anti-
Impact is improved, to compensate for the shortcomings that PE is cracked vulnerable to environmental stress.
4, chemical-resistant characteristic: XLPE has stronger acid and alkali-resistance and oil resistivity, and combustion product is mainly water and titanium dioxide
Carbon, it is smaller to the harm of environment, meet modern fire safety requirement,
Embodiment
It is a kind of cross-linked polyethylene insulated cable terminal structure provided by the embodiment of the utility model, such as Fig. 1 referring to Fig. 1
Shown, which includes cable main body 1, and the cable main body 1 includes the copper shield 3 being set to outside conductor 2 and is set to
Armor 4 outside the copper shield 3, the copper shield 3 and armor 4 are individually drawn with stranded conductor 5 respectively, are formed
Two piece-root grafting ground wires, it is insulated from each other between two ground lines；
Wherein, the section of the copper shield ground line is not less than 25mm2, the section of the armor ground line is not less than
10mm2。
Traditional copper shield and armor are welded together that draw a piece-root grafting ground wire grounded by structure provided by the present application
Method is improved to the armor and copper shield and is individually drawn with the stranded conductor of insulation respectively, forms two piece-root grafting ground wires；
Pass through above-mentioned improvement, it is ensured that when carrying out detection test, can individually detect to copper shield and armor weldering, really
Cable jacket insulation resistance test may be implemented in guarantor；Cable liner layer insulation resistance test；Test copper shield D.C. resistance
The ratio between with conductor DC resistance.
It further, further include the cable connector being set in the cable main body, the cable connector is for realizing institute
Cable main body is stated to be connected with another cable main body；The ground line and the armor for the inside shielded layer that the cable connector includes
Between be provided with insulating layer so as to the separation both realized.The armor is grounded and is located at the cable connector other end
Another armature of cable layer ground line is electrically connected by conducting wire.The cable main body includes the first outer jointing jacket, the armor
Ground line is external to be provided with the second outer jointing jacket；Second outer jointing jacket and the first outer jointing jacket insulation having the same
And sealing performance, first outer jointing jacket and second outer jointing jacket overlap.The cable main body includes the first liner layer,
The cable connector includes the second liner layer, and first liner layer and second liner layer overlap.
It include more conductors in the cable main body, the copper shield being independently arranged for including leads to respectively outside every conductor
It crosses stranded conductor and individually draws and form a plurality of copper shield ground line, it is insulated from each other between a plurality of copper shield ground line.It can be with
It is contemplated that the structure, when being applied in multicore cable, the copper shield outside every conductor needs individually to draw ground connection, in this way
It can guarantee in test, individually prediction judgement can be carried out to the performance condition of the copper shield outside each conductor.Pass through
Structure provided by the present application, since independent electricity may be implemented in later period test in copper shield and armor independent grounding
Resistance test, from the realization more accurately independent detection to each layer of performance condition.
The embodiment of the present application can also provide a kind of test method of cross-linked polyethylene insulated cable terminal structure, such as
Shown in Fig. 2, which comprises
Measurement at the same temperature, which is surveyed, using instrument for measuring DC resistance before putting into operation obtains the first copper shield direct current
Resistance value and the first DC conductor resistance；It calculates and obtains the first copper shield DC resistance and the first DC conductor resistance
First ratio；When cable main body is including two and with upper conductor, two of them conductor is shorted and is surveyed as a conductor
Amount, and then obtain first DC conductor resistance.
Measurement at the same temperature, which is surveyed, using instrument for measuring DC resistance after putting into operation obtains the second copper shield direct current
Resistance value and the second DC conductor resistance；It calculates and obtains the second copper shield DC resistance and the second DC conductor resistance
Second ratio；
Second ratio is compared with first ratio；
Preventive trial result is made according to comparison result and estimates acquisition estimation results.
Further, when second ratio is greater than first ratio, the estimation results include copper shield quilt
Corrosion and or cable jacket cause liner layer water inlet cause copper shield to corrode；
When second ratio is less than first ratio, the estimation results include that the conductor connection point in attachment connects
Electric shock resistance increases.
The embodiment of the present application can also provide a kind of test method of cross-linked polyethylene insulated cable terminal structure, such as
Shown in Fig. 3, which comprises
It is measured using insulating resistance value of the megameter to cable main body, when insulating resistance value is lower than 0.5M Ω/km
It makes and estimates acquisition estimation results, the estimation results include that cable jacket is destroyed by external force and liner layer is caused to be intake, and are made
Decline at insulation.
Further, the megameter is 500V megohm meter.
In order to realize that cable jacket insulation resistance test, cable liner layer insulation resistance test, test copper shield are straight
The test of three projects of the ratio between leakage resistance and conductor DC resistance, the application is to golden in twisted polyethylene cable attachment mounting process
Belong to shielded layer and be changed with traditional earthing method of armor, earth wire draws when making cable termination and connector thus
Side makees following improve out:
1, the construction technology of cable termination
Conventional connections technique: armature of cable layer connects together one ground connection of composition using stranded conductor with copper shield
Line guides to outer end.
Improved wiring technique: power cable with cross-linked polyethylene insulation should be by the armor and copper shield of terminal when constructing
Layer is individually drawn with the stranded conductor with insulation respectively, forms two ground lines, and the section of copper shield ground line cannot be less than
The section of 25mm2, armor ground line should be not less than 10mm2.
2, points for attention when constructing
In construction joint, have to ensure copper shield, liner layer, the complete and continuity of oversheath, connector inside
The ground line of shielded layer must not connect together with armor, and the armor for docking both sides of head must be connected with another piece-root grafting ground wire,
And it must insulate with copper shield.If when in the original structure of connector without liner layer, liner layer should be increased outside copper shield,
And overlapped with the liner layer of cable body, the sealing of lap-joint must seal must be good, it is ensured that copper shield, armor, interior
The integrality and continuity of lining.Necessary oversheath outside the ground line of armor is connected, and is had identical with oversheath
Insulation and sealing performance, it is ensured that the integrality and continuity of cable jacket.
Improved advantage
It will be brought convenience to wireline test using the cable termination and connector of above-mentioned technique production, cable can be grasped in time
Operation conditions provides valuable basic data, convenient for technical staff's analysis, judgement, grasps current device operation conditions, really
Protecting pilot project as defined in regulation can smoothly complete.
Improved test method:
Status: generally before cable installation, on cable roller, separating the cable at both ends, corresponding individual cord test,
Later period cable is unable to test once laying and finishing running D.C. resistance, this general is without test.
Improved method: test constantly clenches two cable cores, forms Cheng Yigen core wire, utilizes D.C. resistance
The DC resistance of copper shield and conductor at the identical temperature in tester side, before putting into operation compared with measured resistance value,
When the DC resistance of copper shield increases compared with the ratio between DC resistance of conductor is before put into operation, show that copper shield is straight
Leakage resistance increases, and copper shield is possible to be corroded, and then infers whether that cable jacket causes liner layer water inlet to cause copper screen
Cover layer corrosion；When reducing before the two ratio and being compared to before putting into operation puts into operation, show the conductor connection point contact electricity in attachment
A possibility that resistance increases.
Cable operation conditions and the operation cable can also be judged indirectly by the test of the liner layer insulation resistance of cable
Whether oversheath is destroyed by external force and liner layer is caused to intake.
Improved effect:
Using 500V megohm meter, it should suspect when megameter is lower than 0.5M Ω/km and judge whether cable jacket by outer
Power is destroyed and liner layer is caused to be intake, and insulation is caused to decline.Because direct-burried twisted polyethylene cable is inhaled by underground water long period of soaking
When destroying after water or by external force and not destroying completely, insulation resistance is possible to drop under specified value.Oversheath
Water inlet is not necessarily intended to repair immediately, but after liner layer damage and water inflow, moisture is directly connect with cable core insulating layer and copper shield
Touching, and copper shield may be corroded, it should overhaul as early as possible.Because working as copper shield in the cable of copper shield one end ground connection
When band fracture, the shielding band of ungrounded one end becomes ungrounded state, which induces very high voltage, thus to leading
It causes fracture location to discharge, causes insulation breakdown.
The structure may insure cable testing and detection work easily and effectively, and armor, copper shield are individually drawn and connect
Ground proposes serial cable core wire, the numerical value measured divided by 2, just for the status of running D.C. resistance being unable to test
For the DC resistance of individual cord, reference is provided for cable fault judgement, by the technological improvement of the above two o'clock, to realize electricity
The detection project detection of the overall preventative test of cable lays a good foundation, while also advantageous for daily maintenance, breakdown judge
Condition has good reference value in practical applications.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the preferred embodiment of the utility model only, is not intended to limit the protection model of the utility model
It encloses.Any modification, equivalent substitution, improvement and etc. made within the spirit and principle of the present invention, are all contained in this reality
With in novel protection scope.
Claims (6)
1. a kind of cross-linked polyethylene insulated cable terminal structure characterized by comprising
Cable main body, the cable main body include the copper shield being set to outside conductor and are set to outside the copper shield
Armor, the copper shield and armor are individually drawn with stranded conductor respectively, are formed two piece-root grafting ground wires, are connect described in two
It is insulated from each other between ground wire；
Wherein, the section of the copper shield ground line is not less than 25mm2, the section of the armor ground line is not less than
10mm2。
2. cross-linked polyethylene insulated cable terminal structure according to claim 1, which is characterized in that further include being set to institute
The cable connector in cable main body is stated, the cable connector is connected for realizing the cable main body with another cable main body；Institute
It states the cable connector inside shielding layer grounding line for including and is provided with insulating layer between the armor to realize the separation of the two.
3. cross-linked polyethylene insulated cable terminal structure according to claim 2, which is characterized in that the armor ground connection
Line is grounded with another armature of cable layer for being located at the cable connector other end and is electrically connected by conducting wire.
4. cross-linked polyethylene insulated cable terminal structure according to claim 3, which is characterized in that the cable main body packet
The first outer jointing jacket is included, the armor ground line is external to be provided with the second outer jointing jacket；Second outer jointing jacket with it is described
The insulation having the same of first outer jointing jacket and sealing performance, first outer jointing jacket and second outer jointing jacket overlap.
5. cross-linked polyethylene insulated cable terminal structure according to claim 2, which is characterized in that the cable main body packet
The first liner layer is included, the cable connector includes the second liner layer, and first liner layer and second liner layer overlap.
6. cross-linked polyethylene insulated cable terminal structure according to claim 1, which is characterized in that in the cable main body
Comprising more conductors, the copper shield being independently arranged for including outside every conductor passes through stranded conductor respectively and individually draws to be formed
A plurality of copper shield is grounded, insulated from each other between a plurality of copper shield ground line.
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| CN201920040145.2U CN209168814U (en) | 2019-01-10 | 2019-01-10 | A kind of cross-linked polyethylene insulated cable terminal structure |
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| CN201920040145.2U CN209168814U (en) | 2019-01-10 | 2019-01-10 | A kind of cross-linked polyethylene insulated cable terminal structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109741875A (en) * | 2019-01-10 | 2019-05-10 | 临沂矿业集团有限责任公司 | A kind of cross-linked polyethylene insulated cable terminal structure and its test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109741875A (en) * | 2019-01-10 | 2019-05-10 | 临沂矿业集团有限责任公司 | A kind of cross-linked polyethylene insulated cable terminal structure and its test method |
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Effective date of registration: 20220624 Address after: 274700 middle section of Dongxi Road, economic development zone, yuncheng county, Heze City, Shandong Province Patentee after: Shandong energy group Luxi Mining Co.,Ltd. Address before: 276000 No. 69 Commercial Street Road, Luozhuang District, Shandong, Linyi Patentee before: LINYI MINING GROUP Co.,Ltd. |