SE1000152A2 - A method of preparing an electric cable end before mounting an end or joint - Google Patents
A method of preparing an electric cable end before mounting an end or jointInfo
- Publication number
- SE1000152A2 SE1000152A2 SE1000152A SE1000152A SE1000152A2 SE 1000152 A2 SE1000152 A2 SE 1000152A2 SE 1000152 A SE1000152 A SE 1000152A SE 1000152 A SE1000152 A SE 1000152A SE 1000152 A2 SE1000152 A2 SE 1000152A2
- Authority
- SE
- Sweden
- Prior art keywords
- insulation
- conductor
- elastic tube
- surrounding
- screen
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000009413 insulation Methods 0.000 claims abstract description 62
- 239000004020 conductor Substances 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 7
- 229920002799 BoPET Polymers 0.000 claims description 6
- 238000004073 vulcanization Methods 0.000 claims description 5
- 239000000155 melt Substances 0.000 abstract 1
- 230000007704 transition Effects 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000007373 indentation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Terminals (AREA)
- Manufacturing Of Electrical Connectors (AREA)
Abstract
SAMMANDRAG. Uppfinningen hanfdr sig till en metod for beredning av en isoleringsyta pa en elektrisk kraftkabelande 1 innan montering av en skarv eller ett avslut darpa. Kabeln innefattar en ledare 2 och en ledarskarm 3 som omger ledaren, ett lager av isolering 4 omgivande ledarskarmen, och en isoleringsskarm 5 omgivande lagret av isolering.etoden innefattar stegen att exponera en del av isoleringen genom att ta bort en bit av isoleringsskarmen 5; anordna ett elastiskt ror 7 runt den exponerade isoleringsytan 6; anordna ett varmeband runt det elastiska rdret 7; varma och trycksatta atminstone en del av den exponerade isoleringsytan 6, sa att den smalter i anslutning till det elastiska roret och det smalta materialet omfordelar sig och bildar en slat yta.(Fig. 1)SUMMARY. The invention relates to a method for preparing an insulation surface on an electrical power cabling 1 before mounting a joint or an end thereto. The cable comprises a conductor 2 and a conductor frame 3 surrounding the conductor, a layer of insulation 4 surrounding the conductor frame, and an insulating frame 5 surrounding the layer of insulation. The method includes the steps of exposing part of the insulation by removing a piece of the insulating frame 5; arranging an elastic tube 7 around the exposed insulation surface 6; arrange a heating tape around the elastic row 7; hot and pressurized at least a part of the exposed insulation surface 6, said it melts adjacent to the elastic tube and the thin material redistributes and forms a smooth surface. (Fig. 1)
Description
20 25 30 35 where the hole in the natural, non-stretched, state has an inner diameter that is somewhat smaller than the outer diameter of the insulation on the cables to be jointed. It is necessary for the elastic jointing body after the jointing to embrace the insulation of the cable ends for the purpose of obtaining a close-fitting joint. 20 25 30 35 where the hole in the natural, non-stretched, state has an inner diameter that is somewhat smaller than the outer diameter of the insulation on the cables to be jointed. It is necessary for the elastic jointing body after the jointing to embrace the insulation of the cable ends for the purpose of obtaining a close-fitting joint.
The cable ends are prepared by exposing the conductors from the insulation and by joining the conductor ends together. The joining is usually carried out with a jointing sleeve which by means of mechanical deformation brings the sleeve into contact with the conductors. Before the jointing body is brought to a centered position over the jointing sleeve a predetermined part of the insulation screen is removed, where the length of the exposed insulation layer depends on the dimension and type of cable joint to be used. The removal of the insulation with the aid of cutting- and grinding tools may lead to a rough insulation surface and transition to the insulation screen.The cable ends are prepared by exposing the conductors from the insulation and by joining the conductor ends together. The joining is usually carried out with a jointing sleeve which by means of mechanical deformation brings the sleeve into contact with the conductors. Before the jointing body is brought to a centered position over the jointing sleeve a predetermined part of the insulation screen is removed, where the length of the exposed insulation layer depends on the dimension and type of cable joint to be used. The removal of the insulation with the aid of cutting- and grinding tools may lead to a rough insulation surface and transition to the insulation screen.
The interface between the cable insulation and the mounted cable joint or termination is a place where an electric breakdown of the cable may occur due to the rough surface formed at the removal of the insulation screen. It is therefore desirable to find a method that will improve the smoothness of the insulation surface as well as of the transition between the insulation and insulation screen.The interface between the cable insulation and the mounted cable joint or termination is a place where an electric breakdown of the cable may occur due to the rough surface formed at the removal of the insulation screen. It is therefore desirable to find a method that will improve the smoothness of the insulation surface as well as of the transition between the insulation and insulation screen.
SUMMARY OF THE INVENTION It is an object of the invention to provide a method for preparing a smooth insulation surface on an electric cable end before mounting a cable joint or termination thereon. The cable comprises a conductor, a conductor screen surrounding the conductor, an insulation layer surrounding the conductor screen, and an insulation screen surrounding the insulation layer. 10 15 20 25 30 35 This object is achieved by a method comprising following steps: exposing a part of the insulation on the cable end by removing a part of the insulation screen; arranging an elastic tube around the exposed insulation surface; arranging a heating tape around the elastic tube; and heating and pressurizing at least a part of the exposed insulation surface, such that the surface is melted adjacent to the elastic tube and the melted material is redistributed and creates a smooth surface.SUMMARY OF THE INVENTION It is an object of the invention to provide a method for preparing a smooth insulation surface on an electric cable end before mounting a cable joint or termination thereon. The cable comprises a conductor, a conductor screen surrounding the conductor, an insulation layer surrounding the conductor screen, and an insulation screen surrounding the insulation layer. 10 15 20 25 30 35 This object is achieved by a method comprising following steps: exposing a part of the insulation on the cable end by removing a part of the insulation screen; arranging an elastic tube around the exposed insulation surface; arranging a heating tape around the elastic tube; and heating and pressurizing at least a part of the exposed insulation surface, such that the surface is melted adjacent to the elastic tube and the melted material is redistributed and creates a smooth surface.
By the redistribution of the melted material a smooth surface is provided and therewith the risk of an electric breakdown caused by a rough insulation surface is eliminated, or at least reduced, compared to for an insulation surface that is kept in its rough state when mounting a cable joint or termination thereon.By the redistribution of the melted material a smooth surface is provided and therewith the risk of an electric breakdown caused by a rough insulation surface is eliminated, or at least reduced, compared to for an insulation surface that is kept in its rough state when mounting a cable joint or termination thereon.
The pressurizing of the insulation surface is achieved by placing the cable end in a pressure chamber, such as a vulcanization pipe. The gas pressure in the vulcanization pipe together with the elastic tube will provide an even pressure over the surface where the material is to be heated and redistributed.The pressurizing of the insulation surface is achieved by placing the cable end in a pressure chamber, such as a vulcanization pipe. The gas pressure in the vulcanization pipe together with the elastic tube will provide an even pressure over the surface where the material is to be heated and redistributed.
According to an alternative embodiment, the above described method comprises the additional step of arranging an additional layer, such a polytetraflourethylene (PTFE) film or biaxially-oriented polyethylene terephthalate (boPET) film, between the insulation surface and the elastic tube. Thereby the elastic tube is prevented from getting stuck in the insulation layer and to cause damages to the smooth surface when the elastic tube is removed.According to an alternative embodiment, the above-described method comprises the additional step of arranging an additional layer, such as a polytetraflourethylene (PTFE) film or biaxially-oriented polyethylene terephthalate (boPET) film, between the insulation surface and the elastic tube. Thereby the elastic tube is prevented from getting stuck in the insulation layer and to cause damages to the smooth surface when the elastic tube is removed.
BRIEF DESCRIPTION OF THE DRAWING The invention will be described in greater detail by description of embodiments with reference to the accompanying 10 15 20 25 30 35 drawing, wherein figure 1 is a cross-section of an electric cable end provided with an elastic tube and a heating tape when the method according to an embodiment of the present invention is performed.BRIEF DESCRIPTION OF THE DRAWING The invention will be described in greater detail by description of embodiments with reference to the accompanying 10 15 20 25 30 35 drawing, wherein figure 1 is a cross-section of an electric cable end provided with an elastic tube and a heating tape when the method according to an embodiment of the present invention is performed.
DESCRIPTION OF PREFERRED EMBODIMENTS Figure 1 is a cross-section of an end 1 of an electric cable provided with an elastic tube 7 and heating tape 8 when the method according to an embodiment of the invention is performed. The cable comprises a conductor 2 and a conductor screen 3 surrounding the conductor, an insulation layer 4 surrounding the conductor screen 3, and an insulation screen 5 surrounding the insulation layer 4. A surface of the insulation layer is exposed by removing a part of the insulation screen 5. The removed part extends over a predetermined length from the outer end of the insulation The length of on the dimension and type of joint or termination to be layer. the removed insulation screen 5 depends mounted on the cable end 1. The conductor screen 3 extends along the conductor and outside the end of the insulation layer.DESCRIPTION OF PREFERRED EMBODIMENTS Figure 1 is a cross-section of an end 1 of an electric cable provided with an elastic tube 7 and heating tape 8 when the method according to an embodiment of the invention is performed. The cable comprises a conductor 2 and a conductor screen 3 surrounding the conductor, an insulation layer 4 surrounding the conductor screen 3, and an insulation screen 5 surrounding the insulation layer 4. A surface of the insulation layer is exposed by removing a part of the insulation screen 5. The removed part extends over a predetermined length from the outer end of the insulation The length of on the dimension and type of joint or termination to be layer. the removed insulation screen 5 depends mounted on the cable end 1. The conductor screen 3 extends along the conductor and outside the end of the insulation layer.
An elastic tube 7 is arranged around a part of the exposed insulation surface 6, and a part of the insulation screen. The material in the elastic tube is, for example, silicone.An elastic tube 7 is arranged around a part of the exposed insulation surface 6, and a part of the insulation screen. The material in the elastic tube is, for example, silicone.
Thereafter a heating tape 8 is arranged around the elastic tube 7. The heating tape should be arranged around the insulation surface 6 on a part nearby the transition 10 to the insulation screen 5, over the transition 10 and around the part of the insulation screen that are arranged next to the cut end of the insulation screen.Thereafter a heating tape 8 is arranged around the elastic tube 7. The heating tape should be arranged around the insulation surface 6 on a part near the transition 10 to the insulation screen 5, over the transition 10 and around the part of the insulation screen that are arranged next to the cut end of the insulation screen.
Both ends of the elastic tube 7 are kept cold, by not being covered by the heating tape 8, so that no indentations are 10 15 20 25 30 created in the insulation screen 5 and the insulation surface 6 arranged outside of the surface to be smoothened.Both ends of the elastic tube 7 are kept cold, by not being covered by the heating tape 8, so that no indentations are 10 15 20 25 30 created in the insulation screen 5 and the insulation surface 6 arranged outside of the surface to be smoothened .
The cable end 1 is placed in a vulcanization pipe 9 and the part of the insulation surface 6 and insulation screen 5 covered with heating tape 8 is heated and put under pressure by the gas pressure in the vulcanization pipe. The pressure that is applied onto the heated and melt cable surface via the elastic tube will smoothen the surface by redistributing the material closest to the elastic tube and thereby forming a smooth interface to the cable joint or cable termination to be mounted.The cable end 1 is placed in a vulcanization pipe 9 and the part of the insulation surface 6 and insulation screen 5 covered with heating tape 8 is heated and put under pressure by the gas pressure in the vulcanization pipe. The pressure that is applied onto the heated and melt cable surface via the elastic tube will smoothen the surface by redistributing the material closest to the elastic tube and thereby forming a smooth interface to the cable joint or cable termination to be mounted.
After heating, the cable end is allowed to cool down before dismounting the equipment.After heating, the cable end is allowed to cool down before dismounting the equipment.
To prevent the silicone from the elastic tube to stick into the smooth surface achieved by the heat and pressure, an additional layer of, for example, a film of (PTFE) (boPET), the insulation surface and the elastic tube, polytetraflourethylene or biaxially-oriented polyethylene terephthalate can be arranged between and in contact with the insulation surface.To prevent the silicone from the elastic tube to stick into the smooth surface achieved by the heat and pressure, an additional layer of, for example, a film of (PTFE) (boPET), the insulation surface and the elastic tube, polytetraflourethylene or biaxially -oriented polyethylene terephthalate can be arranged between and in contact with the insulation surface.
The above described method is applicable to medium or high- voltage electric cables and for alternating current or direct current.The method described above is applicable to medium or high-voltage electric cables and for alternating current or direct current.
The above description has been describing the preparation of a cable end before mounting a pre-fabricated cable joint.The above description has been describing the preparation of a cable end before mounting a pre-fabricated cable joint.
However, it should be understood that the same method could be used when installing other types of cable accessories, such as a cable termination or flexible vulcanized joint.However, it should be understood that the same method could be used when installing other types of cable accessories, such as a cable termination or flexible vulcanized joint.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1000152A SE1000152A2 (en) | 2010-02-17 | 2010-02-17 | A method of preparing an electric cable end before mounting an end or joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE1000152A SE1000152A2 (en) | 2010-02-17 | 2010-02-17 | A method of preparing an electric cable end before mounting an end or joint |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| SE1000152A1 SE1000152A1 (en) | 2010-03-17 |
| SE1000152L SE1000152L (en) | 2010-03-17 |
| SE1000152A2 true SE1000152A2 (en) | 2010-07-20 |
Family
ID=42082375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE1000152A SE1000152A2 (en) | 2010-02-17 | 2010-02-17 | A method of preparing an electric cable end before mounting an end or joint |
Country Status (1)
| Country | Link |
|---|---|
| SE (1) | SE1000152A2 (en) |
-
2010
- 2010-02-17 SE SE1000152A patent/SE1000152A2/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| SE1000152A1 (en) | 2010-03-17 |
| SE1000152L (en) | 2010-03-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NAV | Patent application has lapsed |