CN104931865A - Insulation cover for high-voltage cable line puncture tests and test method - Google Patents
Insulation cover for high-voltage cable line puncture tests and test method Download PDFInfo
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- CN104931865A CN104931865A CN201510323632.6A CN201510323632A CN104931865A CN 104931865 A CN104931865 A CN 104931865A CN 201510323632 A CN201510323632 A CN 201510323632A CN 104931865 A CN104931865 A CN 104931865A
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Abstract
The invention relates to an insulation cover for high-voltage cable line puncture tests and a test method. The insulation cover is installed at a high-voltage cable terminal pile head of a cable cabin and is used for isolating the cable terminal pile head from surrounding ground potential when a puncture test is performed on a high-voltage cable line. The insulation cover is L-shaped and is composed of a sleeve connection part and a lead-out part, wherein the sleeve connection part and the lead-out part are both of a cylindrical structure; a metal electric conduction body is arranged in the L-shaped insulation cover; the sleeve connection part directly sleeves the high-voltage cable terminal pile head; and the lead-out part is used for leading the cable terminal pile head from the interior of the insulation cover to the external side of the cable cabin. With the insulation cover adopted, the cable terminal pile head can be effectively isolated from the surrounding ground potential, the problems of damage to a cable body and generation of a pungent gas when a traditional method is adopted and the distance between an indoor cable terminal pile head and surrounding ground potential is insufficient can be solved.
Description
Technical field
The present invention relates to power cable line, particularly high-tension cable withstand voltage test, be specifically related to a kind of Voltage Cable Lines Construction withstand voltage test insulating boot and test method.
Background technology
Power cable line is one of transmission and the main element distributing electric energy in electrical network.At the occasion widespread use power cable line such as transformer station, switchyard, central station that power circuit is intensive, play the irreplaceable vital role of pole line.The operation management business of domestic 35kV and the 10kV cable line (hereinafter referred to as " Voltage Cable Lines Construction ") in Jiading district in Shanghai is administered by Guo Wang Shanghai International Automobile City Tourist Festival electric company.
Cable line withstand voltage test is a job the most conventional in cable line newly built construction, interruption maintenance, breakdown repair, and the transformer and distribution power station of earlier operation is open type position in storehouse, cable termination pile crown take apart after with current potential air peripherally apart from abundant.But, the development of and miniaturization closed along with transformer and distribution power station switch cubicle, its turnover Voltage Cable Lines Construction position in storehouse is more compact, thus cause cable line before newly built construction puts into operation, after interruption maintenance, after breakdown repair due to inside cable terminal pile crown and current potential close together peripherally, make withstand voltage test be difficult to meet the requirement of real work.
For solving the problem, traditional method is:
Method one, for the small bore cable (cross-section of cable≤120mm
2), utilize the pliability of cable body, by cable termination pile crown pull-out position in storehouse, as shown in Figure 1, thus maintenance and peripherally current potential certain distance are to meet the requirement of withstand voltage test.
The method has slight damage to cable body, and easily causes cable termination pile crown to be difficult to again overlap due to cable displacement.
Method two, for the electric cable with large cross-section (cross-section of cable>=240mm
2), because cable body flexibility is comparatively strong, method one cannot be copied to implement, the general insulated target that adopts separates cable termination pile crown and current potential peripherally.
The method is due to the dirty of insulated target surface and insulation system, and surface leakage current is comparatively large, easily causes withstand voltage test leakage current values bigger than normal, correctly cannot reflect the leakage current values of cable body, and when withstand voltage test value is higher, can produce pungent gas.
Summary of the invention
The object of this invention is to provide a kind of Voltage Cable Lines Construction withstand voltage test insulating boot, described insulating boot is arranged on cable termination pile crown, effectively cable termination pile crown and current potential are peripherally separated, when carrying out cable line withstand voltage test in order to solve in novel transformer and distribution power station position in storehouse, for avoiding inside cable terminal pile crown not enough with the distance of current potential peripherally, withstand voltage test is caused to be difficult to meet the problem of real work requirement, meanwhile, avoid because adopting classic method to cause cable body to damage and producing the problem of pungent gas.
For achieving the above object, the solution of the present invention is: a kind of Voltage Cable Lines Construction withstand voltage test insulating boot, described insulating boot is arranged on cable bin hv cable termination pile crown place, for when Voltage Cable Lines Construction carries out withstand voltage test, cable termination pile crown is covered, safe enough distance is kept with current potential peripherally, described insulating boot is L shape, described L shape insulating boot is divided into socket part and extension, described socket part and extension are cylindrical structure, metallic conductor is provided with in described L shape insulating boot, one end of described metallic conductor is for stube cable terminal pile crown during withstand voltage test, the other end of described metallic conductor is outside through insulating boot by extension as exit, for connecting high-voltage connection during withstand voltage test, described socket part is directly socketed on hv cable termination pile crown, described extension is used for cable termination pile crown current potential to lead to outside cable bin from insulating boot inside.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, described socket part and extension are provided with umbrella skirt construction, in order to increase along face creepage distance.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, described metallic conductor and cable termination pile crown adopt spring pressuring plate to be connected.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, described spring pressuring plate can 90 degree of corner transpositions.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, the material of described metallic conductor is copper.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, the material of described insulating boot is teflon.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, the terminals of described metallic conductor are provided with high-voltage connection and connect hole.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, the inside hollow out length of the insulating boot socket part of 10kV high-tension cable is at least 140mm ~ 145mm, the inside hollow out diameter of socket part is at least 51mm ~ 55mm, the top insulation thickness of socket part is at least 10mm ~ 12mm, and the avris insulation thickness of socket part is at least 8mm ~ 10mm.
According to Voltage Cable Lines Construction withstand voltage test insulating boot of the present invention, the inside hollow out length of the insulating boot socket part of 35kV high-tension cable is at least 190mm ~ 195mm, the inside hollow out diameter of socket part is at least 65mm ~ 70mm, the top insulation thickness of socket part is at least 12mm ~ 14mm, and the avris insulation thickness of socket part is at least 10mm ~ 12mm.
The present invention also aims to provide a kind of method adopting above-mentioned insulating boot to carry out withstand voltage test, described method by insulating boot socket part effectively cable termination pile crown and current potential are peripherally separated, when carrying out cable line withstand voltage test in order to solve in novel transformer and distribution power station position in storehouse, for avoiding inside cable terminal pile crown not enough with the distance of current potential peripherally, withstand voltage test is caused to be difficult to meet the problem of real work requirement, meanwhile, avoid because adopting classic method to cause cable body to damage and producing the problem of pungent gas.
For achieving the above object, the solution of the present invention is: a kind of method adopting above-mentioned insulating boot to carry out withstand voltage test, when withstand voltage test is carried out in preparation, first, by the socket part of three described insulating boots respectively correspondence be socketed in threephase cable terminal pile crown, threephase cable terminal pile crown is covered, makes itself and current potential peripherally keep safe enough distance; Meanwhile, by the extension of insulating boot, the current potential of cable termination pile crown is caused outside position in storehouse from insulating boot inside; Then, withstand voltage test high-voltage connection directly connects the electric conductor that insulating boot inside is drawn, and starts to carry out withstand voltage test.
The beneficial effect that the present invention reaches:
(1) insulating boot of the present invention is arranged on cable termination pile crown, effectively cover cable termination pile crown, and keep a safe distance, when avoiding withstand voltage test with current potential peripherally, inside cable terminal pile crown, with current potential distance is not enough peripherally, causes withstand voltage test to be difficult to meet real work requirement;
(2) insulating boot of the present invention is designed to L shape, be divided into socket part and extension, socket part is used for covering cable termination pile crown, extension is used for cable termination pile crown current potential to lead to outside cable position in storehouse from insulating boot inside, make withstand voltage test more safe and reliable, and insulating boot structure of the present invention is simple, to carry, easy for installation.
(3) socket part of insulating boot of the present invention and extension all design umbrella group structure, effectively ensure safe distance;
(4) insulating boot interior metal current-carrying part of the present invention adopts spring pressuring plate to be connected with cable termination pile crown, can ensure the validity connected.
(5) spring pressuring plate of the present invention can replace by 90 degree of corners, has both met the connection arranged in parallel of general threephase cable, and the homeotropic alignment that can meet again threephase cable connects.
(6) insulating boot of the present invention adopts 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 crown, and does not damage the silicon rubber insulation of cable termination itself.
Accompanying drawing explanation
Fig. 1 is the installation site schematic diagram 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 is the extension of insulating boot, and 3 is umbrella skirt construction, and 4 is metallic conductor, and 5 connect hole for high-voltage connection.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further detailed explanation.
The present invention is mainly for when carrying out cable voltage test after Voltage Cable Lines Construction newly built construction, interruption maintenance, fault restoration, the cable termination pile crown being positioned at compact cable position in storehouse and current potential close together peripherally, causing the problem that cannot meet withstand test voltage value and require, designing a kind of insulating boot for covering cable termination pile crown.
As shown in Figure 1, insulating boot of the present invention is arranged on cable bin hv cable termination pile crown place, for when Voltage Cable Lines Construction carries out withstand voltage test, cable termination pile crown is covered, itself and current potential is peripherally made to keep safe enough distance, because of inside cable terminal pile crown and the deficiency of current potential distance peripherally when avoiding withstand voltage test, withstand voltage test is made to be difficult to meet the requirement of real work.
As shown in Figure 2, insulating boot of the present invention is L shape, described L shape insulating boot is divided into socket part 1 and extension 2, described socket part and extension are cylindrical structure, described socket part 1 is communicated with the inside of extension 2, metallic conductor 4 is provided with in described L shape insulating boot, one end of described metallic conductor 4 is for stube cable terminal pile crown during withstand voltage test, the other end of described metallic conductor 4 is outside through insulating boot by extension as exit, for connecting high-voltage connection during withstand voltage test, described socket part 1 is directly socketed on hv cable termination pile crown, described extension 2 is for leading to cable termination pile crown current potential outside cable bin from insulating boot inside.The socket part of insulating boot and extension are provided with umbrella skirt construction 3, in order to increase along face creepage distance, effectively ensure safe distance.
When insulating boot of the present invention is used for withstand voltage test, when withstand voltage test is carried out in preparation, first, by the socket part of three described insulating boots respectively correspondence be socketed in threephase cable terminal pile crown, threephase cable terminal pile crown is covered, makes itself and current potential peripherally keep safe enough distance; Meanwhile, by the extension of insulating boot, the current potential of cable termination pile crown is caused outside position in storehouse from insulating boot inside; Then, withstand voltage test high-voltage connection directly connects the electric conductor that insulating boot inside is drawn, and starts to carry out withstand voltage 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 for Voltage Cable Lines Construction 10kV normal cable, and its cross section is 70mm
2, 120mm
2, 240mm
2, 400mm
2four kinds, concrete size is see table one.
Table one high-tension cable indoor 10KV cable termination pile crown size table
The present embodiment considers various O. cable terminal pile crown and all can use and not damage the silicon rubber insulation of cable termination itself, the inside hollow out length of the insulating boot socket part of 10kV high-tension cable is at least 140mm ~ 145mm, insulating boot is installed for enabling cable termination pile crown, the intended diameter of insulating boot should slightly larger than the width of full-size pile crown under same electric pressure, and the inside hollow out diameter of the insulating boot socket part of 10kV high-tension cable is at least 51mm ~ 55mm.The top insulation thickness of insulating boot socket part is at least 10mm ~ 12mm, and the avris insulation thickness of socket part is at least 8mm ~ 10mm, and this insulation thickness can meet the requirement of regulation withstand voltage test value and leave abundant nargin.
When carrying out withstand voltage test, drawing high-voltage connection from inside cable terminal pile crown, requiring that the insulated part of insulating boot has the ability can bearing conventional withstand voltage value, avoid cable termination pile crown to the creepage or direct electric discharge phenomena of current potential generation peripherally.Conventional insulation materials in electrical industry being applied compares from relative dielectric constant, alternating current breakdown intensity, machining property and economy four angles, the present embodiment adopts polytetrafluoroethylmaterial material as the insulated part material of insulating boot, teflon meets processibility, cost is low, and alternating current breakdown intensity is high.
The present embodiment selects copper product as the material of the electric conductor of insulating boot inside, the feature of copper product is mainly that specific conductance is large, physical strength is quite high, handling ease and corrosion-resistant, and high voltage power cable core material generally uses copper product, adopt copper product as the material of internal current conductor, when can ensure that auxiliary electrode is connected with cable core, contact resistance is little and avoid accidental state in actual use to cause auxiliary electrode to rupture.
In the present embodiment, described metallic conduction and cable termination pile crown adopt spring pressuring plate to be connected, and can ensure the validity connected, and described spring pressuring plate can replace by 90 degree of corners, has both met the connection arranged in parallel of general three-phase, can meet again three-phase homeotropic alignment and connect.
When insulating boot of the present invention is used for withstand voltage test, the equal correspondence of each phase terminal pile crown of threephase cable arranges an insulating boot, three insulating boots cover the cable termination pile crown of corresponding phase simultaneously, cable termination pile crown and potential isolation are peripherally left, cable termination pile crown and current potential is peripherally made to keep safe enough distance, and by extension, the current potential of cable termination pile crown is caused outside position in storehouse from insulating boot inside, withstand voltage test high-voltage connection directly connects the exit of the electric conductor that insulating boot inside is drawn, carry out withstand voltage test, process of the test is more safe and reliable, following table two is test effect table:
Table two 10KV cable insulating boot test effect table
The insulating boot of the present embodiment is under regulation withstand test voltage value, and leakage current values is less, without puncturing, without creepage, without phenomenons such as heatings, meet designing requirement.
Embodiment two:
The present embodiment two is compared with embodiment one, and difference is only the difference of design size, and 35kV normal cable cross section is 400mm
2and 630mm
2two kinds, concrete size is see table three.
Table three high-tension cable indoor 35KV cable termination pile crown size table
The present embodiment considers various O. cable terminal pile crown and all can use and not damage the silicon rubber insulation of cable termination itself, the inside hollow out length of the insulating boot socket part of 35kV high-tension cable is at least 190mm ~ 195mm, insulating boot is installed for enabling cable termination pile crown, the intended diameter of insulating boot should slightly larger than the width of full-size pile crown under same electric pressure, and the inside hollow out diameter of the insulating boot socket part of 35kV high-tension cable is at least 65mm ~ 70mm.The top insulation thickness of insulating boot socket part is at least 12mm ~ 14mm, and the avris insulation thickness of socket part is at least 10mm ~ 12mm, and this insulation thickness can meet the requirement of regulation withstand voltage test value and leave abundant nargin.
Following table four is that 35KV high-voltage cable insulating cover is used for test effect table:
Table four 35KV cable insulating boot test effect table
The insulating boot of the present embodiment is under regulation withstand test voltage value, and leakage current values is less, without puncturing, without creepage, without phenomenons such as heatings, meet designing requirement.
10kV and the 35kV cable line withstand voltage test insulating boot developed by the present invention, can be carried out withstand voltage test to cable line, avoid the drawback of classic method simultaneously in compact cable position in storehouse.Insulating boot of the present invention is arranged on cable termination pile crown, effectively cover cable termination pile crown, and keep a safe distance, when avoiding withstand voltage test with current potential peripherally, inside cable terminal pile crown, with current potential distance is not enough peripherally, causes withstand voltage test to be difficult to meet real work requirement.Meanwhile, insulating boot of the present invention comprises socket part and extension, is led to outside cable position in storehouse by cable termination pile crown current potential, make withstand voltage test more safe and reliable by extension from insulating boot inside.
Claims (10)
1. a Voltage Cable Lines Construction withstand voltage test insulating boot, it is characterized in that: described insulating boot is arranged on cable bin hv cable termination pile crown place, for when Voltage Cable Lines Construction carries out withstand voltage test, cable termination pile crown is covered, safe enough distance is kept with current potential peripherally, described insulating boot is L shape, described L shape insulating boot is divided into socket part and extension, described socket part and extension are cylindrical structure, metallic conductor is provided with in described L shape insulating boot, one end of described metallic conductor is for stube cable terminal pile crown during withstand voltage test, the other end of described metallic conductor is outside through insulating boot by extension as exit, for connecting high-voltage connection during withstand voltage test, described socket part is directly socketed on hv cable termination pile crown, described extension is used for cable termination pile crown current potential to lead to outside cable bin from insulating boot inside.
2. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 1, it is characterized in that, described socket part and extension are provided with umbrella skirt construction, in order to increase along face creepage distance.
3. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 1, is characterized in that, described metallic conductor and cable termination pile crown adopt spring pressuring plate to be connected.
4. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 3, is characterized in that, described spring pressuring plate can 90 degree of corner transpositions.
5. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 1, is characterized in that, the material of described metallic conductor is copper.
6. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 1, is characterized in that, the material of described insulating boot is teflon.
7. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 1, is characterized in that, the terminals of described metallic conductor are provided with high-voltage connection and connect hole.
8. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 1, it is characterized in that, the inside hollow out length of the insulating boot socket part of 10kV high-tension cable is at least 140mm ~ 145mm, the inside hollow out diameter of socket part is at least 51mm ~ 55mm, the top insulation thickness of socket part is at least 10mm ~ 12mm, and the avris insulation thickness of socket part is at least 8mm ~ 10mm.
9. Voltage Cable Lines Construction withstand voltage test insulating boot according to claim 1, it is characterized in that, the inside hollow out length of the insulating boot socket part of 35kV high-tension cable is at least 190mm ~ 195mm, the inside hollow out diameter of socket part is at least 65mm ~ 70mm, the top insulation thickness of socket part is at least 12mm ~ 14mm, and the avris insulation thickness of socket part is at least 10mm ~ 12mm.
10. insulating boot described in claim 1 is used for the method for withstand voltage test by one kind, it is characterized in that, when withstand voltage test is carried out in preparation, first, by the socket part of three described insulating boots respectively correspondence be socketed in threephase cable terminal pile crown, threephase cable terminal pile crown is covered, makes itself and current potential peripherally keep safe enough distance; Meanwhile, by the extension of insulating boot, the current potential of cable termination pile crown is caused outside position in storehouse from insulating boot inside; Then, withstand voltage test high-voltage connection directly connects the electric conductor that insulating boot inside is drawn, and starts to carry out withstand voltage test.
Priority Applications (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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| 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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|---|---|
| CN104931865A true CN104931865A (en) | 2015-09-23 |
| CN104931865B 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 | Publication date |
|---|---|
| CN104931865B (en) | 2018-03-30 |
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