CN104931865B - A kind of Voltage Cable Lines Construction pressure test insulating boot and test method - Google Patents
A kind of Voltage Cable Lines Construction pressure test insulating boot and test method Download PDFInfo
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- CN104931865B CN104931865B CN201510323632.6A CN201510323632A CN104931865B CN 104931865 B CN104931865 B CN 104931865B CN 201510323632 A CN201510323632 A CN 201510323632A CN 104931865 B CN104931865 B CN 104931865B
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- insulating boot
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- pile crown
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Abstract
The present invention relates to a kind of Voltage Cable Lines Construction pressure test insulating boot and test method, described insulating boot is arranged at cable bin hv cable termination pile crown, for when Voltage Cable Lines Construction carries out pressure test, cable termination pile crown and surrounding ground potential are separated, described insulating boot is L-shaped, it is divided into socket part and extension, socket part and extension are cylindrical structure, metallic conductor is provided with L-shaped insulating boot, socket part is directly socketed on hv cable termination pile crown, extension is used to lead to cable termination pile crown current potential on the outside of cable bin inside insulating boot.Described insulating boot effectively separates cable termination pile crown and surrounding ground potential, when solving to carry out cable run pressure test in new transformer and distribution power station position in storehouse, to avoid inside cable terminal pile crown with surrounding ground potential apart from deficiency, and the conventional method used easily causes cable body to damage and produce the problem of being pungent gas.
Description
Technical field
The present invention relates to power cable line, particularly high-tension cable pressure test, and in particular to a kind of high-voltage cable
Road pressure test insulating boot and test method.
Background technology
Power cable line is to transmit and distribute one of main element of electric energy in power network.In the power transformation that power circuit is intensive
Stand, the occasion such as switchyard, central station extensively using power cable line, play the irreplaceable important function of overhead line institute.State
The domestic 35kV and 10kV cable run (hereinafter referred to as " high-tension cables in Jiading district in Shanghai are administered by net Shanghai International Automobile City Tourist Festival electric company
Circuit ") operation management business.
Cable run pressure test is a job most conventional in cable run newly built construction, interruption maintenance, breakdown repair,
The transformer and distribution power station of earlier operation is open type position in storehouse, and cable termination pile crown is abundant with surrounding ground potential air distance after taking apart.
However, as transformer and distribution power station switch cubicle is closed and the development of miniaturization, its disengaging Voltage Cable Lines Construction position in storehouse is more compact, from
And cause cable run before newly built construction puts into operation, after interruption maintenance, after breakdown repair due to inside cable terminal pile crown and around
Ground potential is closer to the distance so that pressure test is difficult to the requirement for meeting real work.
To solve the above problems, traditional method is：
Method one, for the small bore cable (cross-section of cable≤120mm2), it is using the pliability of cable body, cable is whole
Pile crown is held to pull out position in storehouse, as shown in figure 1, so as to keep with surrounding ground potential certain distance to meet the requirement of pressure test.
This method has slight damage to cable body, and is difficult to again because cable displacement easily causes cable termination pile crown
On overlap joint.
Method two, for the electric cable with large cross-section (cross-section of cable >=240mm2), because cable body flexibility is stronger, can not copy
Method one is implemented, and typically separates cable termination pile crown and surrounding ground potential using insulated target.
For this method due to the dirty and insulation system on insulated target surface, surface leakage current is larger, easily causes pressure-resistant examination
Test that leakage current values are bigger than normal, can not correctly reflect the leakage current values of cable body, and when pressure test value is higher, can produce
Pungent gas.
The content of the invention
It is an object of the invention to provide a kind of Voltage Cable Lines Construction pressure test insulating boot, described insulating boot is arranged on
Cable termination pile crown, effectively cable termination pile crown and surrounding ground potential are separated, to solve in new transformer and distribution power station position in storehouse
During interior progress cable run pressure test, to avoid inside cable terminal pile crown and surrounding ground potential distance deficiency, cause pressure-resistant
The problem of experiment is difficult to meet real work requirement, meanwhile, avoid because causing cable body to damage and produce using conventional method
The problem of pungent gas.
To achieve the above object, the solution of the present invention is：A kind of Voltage Cable Lines Construction pressure test insulating boot, it is described
Insulating boot be arranged on cable bin hv cable termination pile crown at, for Voltage Cable Lines Construction carry out pressure test when, by cable
Terminal pile crown is covered, and keeps safe enough distance with ground potential around, described insulating boot is L-shaped, and described L-shaped insulate
Cover is divided into socket part and extension, and described socket part and extension are cylindrical structure, described L-shaped insulating boot
Metallic conductor is inside provided with, one end of the metallic conductor is used for connecting cable terminal pile crown, the gold during pressure test
Belong to the other end of electric conductor high pressure is connected through outside insulating boot, during for pressure test by extension as exit and draw
Line, described socket part are directly socketed on hv cable termination pile crown, and described extension is used for cable termination stake
Head current potential is led to inside insulating boot on the outside of cable bin.
According to Voltage Cable Lines Construction pressure test insulating boot of the present invention, described socket part and extension
Umbrella skirt construction is provided with, to increase along face creep age distance.
It is whole with cable according to Voltage Cable Lines Construction pressure test insulating boot of the present invention, described metallic conductor
Pile crown is held to be connected using spring pressuring plate.
According to Voltage Cable Lines Construction pressure test insulating boot of the present invention, described spring pressuring plate can 90 degree of corners
Transposition.
According to Voltage Cable Lines Construction pressure test insulating boot of the present invention, the material of described metallic conductor is
Copper.
According to Voltage Cable Lines Construction pressure test insulating boot of the present invention, the material of the insulating boot is polytetrafluoro
Ethene.
According to Voltage Cable Lines Construction pressure test insulating boot of the present invention, the terminals of described metallic conductor
It is provided with high-voltage connection and connects hole.
According to Voltage Cable Lines Construction pressure test insulating boot of the present invention, the insulating boot of 10kV high-tension cables is socketed
Partial inside hollow out length is at least 140mm~145mm, and the inside hollow out diameter for being socketed part is at least 51mm~55mm,
The top insulation thickness of socket part is at least 10mm~12mm, and the avris insulation thickness for being socketed part is at least 8mm~10mm.
According to Voltage Cable Lines Construction pressure test insulating boot of the present invention, the insulating boot of 35kV high-tension cables is socketed
Partial inside hollow out length is at least 190mm~195mm, and the inside hollow out diameter for being socketed part is at least 65mm~70mm,
Socket part top insulation thickness be at least 12mm~14mm, be socketed part avris insulation thickness be at least 10mm~
12mm。
The present invention also aims to provide a kind of method that pressure test is carried out using above-mentioned insulating boot, described method
Effectively cable termination pile crown and surrounding ground potential are separated by the socket part of insulating boot, to solve to match somebody with somebody in new change
When cable run pressure test is carried out in the position in storehouse of power station, to avoid inside cable terminal pile crown and surrounding ground potential distance deficiency,
The problem of causing pressure test to be difficult to meet real work requirement, meanwhile, avoid because causing cable body to damage using conventional method
The problem of hindering and producing pungent gas.
To achieve the above object, the solution of the present invention is：A kind of method that pressure test is carried out using above-mentioned insulating boot, it is accurate
During standby progress pressure test, first, the socket part of three insulating boots is correspondingly sleeved on threephase cable terminal stake respectively
Head, threephase cable terminal pile crown is covered, it is kept safe enough distance with ground potential around；Meanwhile pass through insulating boot
Extension leads to the current potential of cable termination pile crown on the outside of position in storehouse inside insulating boot；Then, pressure test high-voltage connection is straight
The electric conductor drawn inside insulating boot is connect in succession, proceeds by pressure test.
The beneficial effect that the present invention reaches：
(1) insulating boot of the invention is arranged on cable termination pile crown, effectively masking cable termination pile crown, and with peripherally
Current potential keeps safe distance, when avoiding pressure test, inside cable terminal pile crown and surrounding ground potential distance deficiency, causes pressure-resistant
Experiment is difficult to meet real work requirement；
(2) insulating boot of the invention is designed as L-shaped, is divided into socket part and extension, and socket part is used to cover electricity
Cable terminal pile crown, extension are used to lead to cable termination pile crown current potential on the outside of cable position in storehouse inside insulating boot, made resistance to
Pressure experiment is more safe and reliable, and the insulating boot of the present invention is simple in construction, carries, be easy for installation.
(3) the socket part of insulating boot of the present invention and extension design umbrella group structure, and safe distance is effectively ensured；
(4) insulating boot interior metal current-carrying part of the present invention is connected with cable termination pile crown using spring pressuring plate, it is ensured that
The validity of connection.
(5) spring pressuring plate of the present invention can the transposition of 90 degree of corners, both met the connection arranged in parallel of general threephase cable, again might be used
Meet the vertical arrangement connection of threephase cable.
(6) insulating boot of the invention uses polytetrafluoroethylmaterial material, and cost is low, alternating current breakdown intensity is high.
(7) size design of insulating boot of the present invention can meet the use of various O. cable terminal pile crowns, and not damage electricity
The silicon rubber insulation of cable terminal in itself.
Brief description of the drawings
Fig. 1 is the schematic view of the mounting position of insulating boot of the present invention；
Fig. 2 is the structural representation of insulating boot of the present invention.
In figure, 1 is the socket part of insulating boot, and 2 be the extension of insulating boot, and 3 be umbrella skirt construction, and 4 be metallic conduction
Body, 5 be that high-voltage connection connects hole.
Embodiment
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings.
Present invention is generally directed to cable voltage experiment is carried out after Voltage Cable Lines Construction newly built construction, interruption maintenance, fault restoration
When, the cable termination pile crown and surrounding ground potential in compact cable position in storehouse are closer to the distance, cause that pressure-resistant examination can not be met
The problem of testing magnitude of voltage requirement, a kind of insulating boot for being used to cover cable termination pile crown of design.
As shown in figure 1, the insulating boot of the present invention is arranged at cable bin hv cable termination pile crown, in high-tension cable
When circuit carries out pressure test, cable termination pile crown is covered, it is kept safe enough distance with ground potential around, keeps away
Because of inside cable terminal pile crown and the deficiency of surrounding ground potential distance when exempting from pressure test so that pressure test is difficult to meet actual
The requirement of work.
As shown in Fig. 2 insulating boot of the present invention is L-shaped, described L-shaped insulating boot is divided into socket part 1 and drawn
Part 2, described socket part and extension are cylindrical structure, and the inside of the socket part 1 and extension 2 connects
It is logical, metallic conductor 4 is provided with described L-shaped insulating boot, one end of the metallic conductor 4 is used to connect during pressure test
Cable termination pile crown, the other end of the metallic conductor 4 as exit by extension through outside insulating boot, be used for
High-voltage connection is connected during pressure test, described socket part 1 is directly socketed on hv cable termination pile crown, described extraction
Part 2 is used to lead to cable termination pile crown current potential on the outside of cable bin inside insulating boot.The socket part of insulating boot and draw
Go out part and be provided with umbrella skirt construction 3, to increase along face creep age distance, safe distance is effectively ensured.
When the insulating boot of the present invention is used for into pressure test, when being ready for pressure test, first, by three insulation
The socket part of cover is correspondingly sleeved on threephase cable terminal pile crown respectively, and threephase cable terminal pile crown is covered, makes itself and surrounding
Ground potential keeps safe enough distance；Meanwhile by the extension of insulating boot by the current potential of cable termination pile crown from insulating boot
Inside is led on the outside of position in storehouse；Then, pressure test high-voltage connection is directly connected to the electric conductor drawn inside insulating boot, proceeds by
Pressure test.Wherein, high-voltage connection connects hole 5 by high-voltage connection and is connected with metallic conductor 4.
Embodiment one：
The present embodiment one is directed to Voltage Cable Lines Construction 10kV normal cables, and its section is 70mm2, 120mm2,240mm2,
400mm2Four kinds, specific size is referring to table one.
The indoor 10KV cable terminations pile crown size table of the high-tension cable of table one
The present embodiment considers various O. cable terminal pile crowns and can be used and do not damage the silicon of cable termination in itself
Rubber-covered, the inside hollow out length of the insulating boot socket part of 10kV high-tension cables is at least 140mm~145mm, to make electricity
Cable terminal pile crown can install insulating boot, and the intended diameter of insulating boot should be slightly bigger than full-size pile crown under same voltage class
Width, 10kV high-tension cables insulating boot socket part inside hollow out diameter be at least 51mm~55mm.Insulating boot is socketed
Partial top insulation thickness is at least 10mm~12mm, and the avris insulation thickness for being socketed part is at least 8mm~10mm, and this is exhausted
Edge thickness can meet the requirement of regulation pressure test value and leave abundant nargin.
When carrying out pressure test, high-voltage connection is drawn from inside cable terminal pile crown, it is desirable to the insulation division of insulating boot
Divide with the ability that can bear conventional withstanding voltage value, avoid cable termination pile crown from producing ground potential around and climb electricity or direct
Electric discharge phenomena.Conventional insulation materials during electrical industry is applied are from relative dielectric constant, alternating current breakdown intensity, machining property
Energy and four angles of economy are compared, and the present embodiment uses insulated part material of the polytetrafluoroethylmaterial material as insulating boot
Material, polytetrafluoroethylene (PTFE) meet machinability, and cost is low, and alternating current breakdown intensity is high.
The present embodiment selects material of the copper product as the electric conductor inside insulating boot, is mainly conductance the characteristics of copper product
Coefficient is big, mechanical strength is at a relatively high, handling ease and corrosion-resistant, and high voltage power cable core material generally uses copper material
Material, using material of the copper product as internal current conductor, it is ensured that when auxiliary electrode is connected with cable core, contact resistance is small
And avoid in actual use accidental state cause auxiliary electrode to be broken.
In the present embodiment, described metallic conductor is connected with cable termination pile crown using spring pressuring plate, it is ensured that connection
Validity, described spring pressuring plate can the transposition of 90 degree of corners, both met the connection arranged in parallel of general three-phase, three-phase can be met again
Vertical arrangement connection.
When the insulating boot of the present invention is used for into pressure test, each phase terminal pile crown of threephase cable is correspondingly arranged one
Insulating boot, three insulating boots cover the cable termination pile crown of corresponding phase simultaneously, by cable termination pile crown and peripherally potential isolation
Open, cable termination pile crown and surrounding ground potential is kept safe enough distance, and by extension by cable termination pile crown
Current potential is led to inside insulating boot on the outside of position in storehouse, and pressure test high-voltage connection is directly connected to the electric conductor drawn inside insulating boot
Exit, pressure test is carried out, experiment process is more safe and reliable, and following table two is test effect table：
The 10KV cables of table two insulating boot test effect table
For the insulating boot of the present embodiment in the case where providing pressure test magnitude of voltage, leakage current values are smaller, it is no breakdown, without climb electricity,
Phenomena such as without heating, meet design requirement.
Embodiment two：
The present embodiment two differs only in the difference of design size compared with embodiment one, and 35kV normal cables section is
400mm2And 630mm2Two kinds, specific size is referring to table three.
The indoor 35KV cable terminations pile crown size table of the high-tension cable of table three
The present embodiment considers various O. cable terminal pile crowns and can be used and do not damage the silicon of cable termination in itself
Rubber-covered, the inside hollow out length of the insulating boot socket part of 35kV high-tension cables is at least 190mm~195mm, to make electricity
Cable terminal pile crown can install insulating boot, and the intended diameter of insulating boot should be slightly bigger than full-size pile crown under same voltage class
Width, 35kV high-tension cables insulating boot socket part inside hollow out diameter be at least 65mm~70mm.Insulating boot is socketed
Partial top insulation thickness is at least 12mm~14mm, and the avris insulation thickness for being socketed part is at least 10mm~12mm, this
Insulation thickness can meet the requirement of regulation pressure test value and leave abundant nargin.
Following table four is that 35KV high-voltage cable insulatings cover is used for test effect table：
The 35KV cables of table four insulating boot test effect table
For the insulating boot of the present embodiment in the case where providing pressure test magnitude of voltage, leakage current values are smaller, it is no breakdown, without climb electricity,
Phenomena such as without heating, meet design requirement.
10kV the and 35kV cable run pressure test insulating boots developed by the present invention, can be in compact cable position in storehouse
It is interior that pressure test is carried out to cable run, while the drawbacks of avoid conventional method.It is whole that the insulating boot of the present invention is arranged on cable
Pile crown is held, effectively covers cable termination pile crown, and safe distance is kept with ground potential around, it is indoor when avoiding pressure test
Cable termination pile crown and surrounding ground potential distance deficiency, cause pressure test to be difficult to meet real work requirement.Meanwhile the present invention
Insulating boot includes socket part and extension, is led to cable termination pile crown current potential inside insulating boot by extension
On the outside of cable position in storehouse, make pressure test more safe and reliable.
Claims (10)
- A kind of 1. Voltage Cable Lines Construction pressure test insulating boot, it is characterised in that：It is high that described insulating boot is arranged on cable bin At voltage cable terminal pile crown, for when Voltage Cable Lines Construction carries out pressure test, cable termination pile crown being covered, with week Exclosure current potential keeps safe enough distance, and described insulating boot is L-shaped insulating boot, and described L-shaped insulating boot is divided into socket part And extension, described socket part and extension are cylindrical structure, and being provided with metal in described L-shaped insulating boot leads Electric body, one end of the metallic conductor are used for connecting cable terminal pile crown during pressure test, the metallic conductor it is another End as exit by extension through outside insulating boot, for connecting high-voltage connection, described socket during pressure test Part is directly socketed on hv cable termination pile crown, and described extension is used for cable termination pile crown current potential from insulating boot Inside is led on the outside of cable bin.
- 2. Voltage Cable Lines Construction pressure test insulating boot according to claim 1, it is characterised in that described socket part Divide and extension is provided with umbrella skirt construction, to increase along face creep age distance.
- 3. Voltage Cable Lines Construction pressure test insulating boot according to claim 1, it is characterised in that described metal is led Electric body is connected with cable termination pile crown using spring pressuring plate.
- 4. Voltage Cable Lines Construction pressure test insulating boot according to claim 3, it is characterised in that described spring pressure Piece can 90 degree of corner transpositions.
- 5. Voltage Cable Lines Construction pressure test insulating boot according to claim 1, it is characterised in that described metal is led The material of electric body is copper.
- 6. Voltage Cable Lines Construction pressure test insulating boot according to claim 1, it is characterised in that the insulating boot Material is polytetrafluoroethylene (PTFE).
- 7. Voltage Cable Lines Construction pressure test insulating boot according to claim 1, it is characterised in that described metal is led The exit of electric body is provided with high-voltage connection and connects hole.
- 8. Voltage Cable Lines Construction pressure test insulating boot according to claim 1, it is characterised in that 10kV high-tension cables Insulating boot socket part inside hollow out length be at least 140mm~145mm, the inside hollow out diameter for being socketed part is at least 51mm~55mm, the top insulation thickness for being socketed part are at least 10mm~12mm, are socketed the avris insulation thickness of part at least For 8mm~10mm.
- 9. Voltage Cable Lines Construction pressure test insulating boot according to claim 1, it is characterised in that 35kV high-tension cables Insulating boot socket part inside hollow out length be at least 190mm~195mm, the inside hollow out diameter for being socketed part is at least 65mm~70mm, the top insulation thickness for being socketed part are at least 12mm~14mm, are socketed the avris insulation thickness of part at least For 10mm~12mm.
- A kind of 10. method that insulating boot described in claim 1 is used for pressure test, it is characterised in that be ready for pressure-resistant examination When testing, first, the socket part of three insulating boots is correspondingly sleeved on threephase cable terminal pile crown respectively, by threephase cable Terminal pile crown covers, and it is kept safe enough distance with ground potential around；Meanwhile by the extension of insulating boot by cable The current potential of terminal pile crown is led to inside insulating boot on the outside of position in storehouse；Then, pressure test high-voltage connection is directly connected in insulating boot The metallic conductor that portion is drawn, proceeds by pressure test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510323632.6A CN104931865B (en) | 2015-06-12 | 2015-06-12 | A kind of Voltage Cable Lines Construction pressure test insulating boot and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510323632.6A CN104931865B (en) | 2015-06-12 | 2015-06-12 | A kind of Voltage Cable Lines Construction pressure test insulating boot and test method |
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| Publication Number | Publication Date |
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| CN104931865A CN104931865A (en) | 2015-09-23 |
| CN104931865B true CN104931865B (en) | 2018-03-30 |
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| CN107843749A (en) * | 2017-12-11 | 2018-03-27 | 冯志仑 | Insulation protection device |
| CN110007203A (en) * | 2019-05-07 | 2019-07-12 | 国网上海市电力公司 | A kind of high-tension cable pressure test component |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201945604U (en) * | 2010-11-28 | 2011-08-24 | 李琛 | Insulating hood for cable alternating current and withstand voltage test |
| CN202133749U (en) * | 2011-07-06 | 2012-02-01 | 绿宝电缆（集团）有限公司 | Cable partial discharge hanging terminal |
| CN202433484U (en) * | 2011-12-26 | 2012-09-12 | 上海置信电气非晶有限公司 | Insulation performance test bench of elbow type cable head |
| CN103809085B (en) * | 2012-11-15 | 2016-12-21 | 国家电网公司 | Termination and cable voltage method of testing for cable voltage test |
| CN203054161U (en) * | 2012-12-10 | 2013-07-10 | 国家电网公司 | Protection device for cable withstand voltage test |
| CN203705487U (en) * | 2014-02-11 | 2014-07-09 | 国网山东齐河县供电公司 | Cable head insulating and branching device for three-core cables |
| CN103869227B (en) * | 2014-04-02 | 2016-07-06 | 上海华普电缆有限公司 | 10kV and following cross-inked polyethylene power cable shelf depreciation test terminal |
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