CN113315086A - High-voltage-grade crosslinked polyethylene cable insulation joint - Google Patents
High-voltage-grade crosslinked polyethylene cable insulation joint Download PDFInfo
- Publication number
- CN113315086A CN113315086A CN202110418628.3A CN202110418628A CN113315086A CN 113315086 A CN113315086 A CN 113315086A CN 202110418628 A CN202110418628 A CN 202110418628A CN 113315086 A CN113315086 A CN 113315086A
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- China
- Prior art keywords
- joint
- insulation
- insulating
- cable
- cladding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 40
- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 18
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 18
- 239000004020 conductor Substances 0.000 claims abstract description 29
- 238000005253 cladding Methods 0.000 claims description 38
- 239000002184 metal Substances 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 230000001681 protective effect Effects 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 8
- 210000001503 joint Anatomy 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 230000005684 electric field Effects 0.000 abstract description 11
- 230000035882 stress Effects 0.000 description 14
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
Images
Classifications
-
- 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
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress
- H02G15/188—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress connected to a cable shield only
Abstract
The invention discloses a high-voltage grade crosslinked polyethylene cable insulation joint which is characterized by comprising a soft joint and a prefabricated joint for realizing cross interconnection, wherein the soft joint is sleeved and coated outside conductors of two cables which are mutually butted, the prefabricated joint is sleeved and coated outside an outer shielding layer of one cable, insulation protection shells are coated outside the soft joint and the prefabricated joint, and two ends of each insulation protection shell are respectively coated outside outer sheaths of the two cables. The cable connector has the advantages that the prefabricated connector is designed at the position with smaller electric field intensity of the cable in a mode of combining the soft connector with the prefabricated connector, and the insulating connector can realize reliable cross interconnection grounding mode and cable connection.
Description
Technical Field
The invention relates to a cable intermediate joint, in particular to a high-voltage grade cross-linked polyethylene cable insulating joint.
Background
The cables with high voltage class of 66kV and above are mostly single-core cable systems, the metal sheath has induced voltage and is enlarged along with the increase of the length of the cable, the superposition can endanger personal safety, especially when a short-circuit fault, lightning impulse or operation overvoltage occurs to a circuit, the outer sheath can be punctured, in addition, if the two ends of the cable shield are directly grounded, a large circulating current loss can be generated, the cable is heated to reduce the current-carrying capacity, and the thermal aging of the cable is accelerated, therefore, when the circuit of the cable with single-core high voltage class is long, usually, an insulating joint (the metal sheath of the cable at the two ends of the joint and the cable insulating shield are electrically disconnected) is required to be arranged to be matched with a cross interconnection box for transposition connection, so as to realize a cross interconnection grounding mode, thereby reducing the induced voltage of the metal sheath, and effectively avoiding the damage caused by the induced overvoltage when the cable has a short-circuit fault, the circulation loss of the sheath is reduced, and the safe and stable operation of the line is ensured.
At present, the conventional high-voltage grade crosslinked polyethylene cable insulation joints mainly comprise two types, one type is a soft joint, and the other type is an integral prefabricated joint. At present, because the difference exists between the material of the existing integral prefabricated connector and the material of the body cable, an interface exists in the integral prefabricated connector, so that the stability of the product is not as good as that of a soft connector; the existing soft joint needs to meet the functional requirements of the insulating joint, and the relative manufacturing process is complex.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-voltage grade crosslinked polyethylene cable insulating joint which is easy to manufacture and install, and safe and stable to use.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a high voltage level crosslinked polyethylene cable insulation joint, includes soft joint and the prefabricated joint that is used for realizing crossing interconnection, soft joint cup joint the cladding and set up in the conductor outside that two cables docked each other, one of them the outside of the outer shielding layer of cable cup joint the cladding and be provided with prefabricated joint, soft joint with the outside cladding of prefabricated joint be provided with insulating protective housing, insulating protective housing's both ends cladding respectively set up the outside at the oversheath of two cables.
The flexible joint have about link up cup joint the installation cavity, the inner wall arch of cup joint the installation cavity be provided with an annular cladding wall, annular cladding wall in form a conductor cladding cavity, follow respectively after the conductor of two cables is peeled off the left end and the right-hand member of cup joint the installation cavity stretch into and enter into conductor cladding intracavity butt joint, the inner wall of annular cladding wall and the conductor outer wall of two cables hug closely, the inner wall at the both ends of cup joint the installation cavity hug closely with the outer wall of the insulating layer that two conductors peeled off, the left side terminal surface and the right side terminal surface of annular cladding wall hug closely with the side face of peeling off of the insulating layer of two conductors of corresponding position respectively. The cable joint device has the advantages that the structure is simple, the full-coating sleeve joint of the two joint conductors is realized, the connection of the two cable conductors and the insulation recovery of the whole cable main body are realized, and meanwhile, the use safety is effectively improved.
The left side terminal surface of cyclic annular cladding wall for from the toper surface that internal diameter diminishes from the left hand right side, the right side terminal surface of cyclic annular cladding wall for from the toper surface that internal diameter diminishes from the left hand right side. The distribution of the electric field can be effectively equalized.
The left side end surface of the annular cladding wall and the right side end surface of the annular cladding wall are arranged in a mirror symmetry mode. The flatter the taper, the more uniform the electric field distribution.
Prefabricated joint include two semi-conductive sleeves, two semi-conductive sleeve tight fit respectively cup joint and install on the outer shielding layer of one of them cable, two semi-conductive sleeve's looks remote site extend respectively and be provided with the stress cone section of thick bamboo of a round platform form, two the major diameter end of stress cone section of thick bamboo be close to each other and the interval sets up, two stress cone section of thick bamboo connect through an insulating casing cladding, insulating casing include that the cladding sets up two stress cone section of thick bamboo outside outer insulating layer with inlay and establish the cladding two the major diameter end of stress cone between the inner insulating layer, outer insulating layer with inner insulating layer an organic whole set up, semi-conductive sleeve stretch out the setting and be in insulating casing's outside portion. The structure better realizes the physical insulation partition of the metal sheath of the cable and better meets the requirement of cross interconnection of the cable, wherein the stress cone arranged on the semi-conductive sleeve mainly plays a role in homogenizing an electric field.
The left end or the right end of the insulating shell is provided with an annular recess, the annular recess is sleeved with a semi-conductive shell, and the end of the semi-conductive shell is bent, wrapped and arranged on the end of the insulating shell. The function of homogenizing the electric field strength is achieved by the semi-conductive shell.
The insulation protection shell comprises a first insulation layer which is coated and arranged outside the soft joint and the prefabricated joint, the first insulating layer comprises a main insulating section for completely coating the soft joint and the prefabricated joint and end insulating sections which are integrally connected with two ends of the main insulating section and are used for coating and arranging the end insulating sections outside the metal shielding layers of the two cables, the outer part of the end head insulating section and the outer parts of the two end heads of the main body insulating section are coated with metal protective shells which are connected through a first insulating sleeve, the first insulating sleeve is arranged on the outer wall of the main insulating section in a coated mode, the outer portion of the metal protective shell is protected and provided with insulating sheaths, the two insulating sheaths are connected through the second insulating sleeve, and the insulating sheaths are connected with the outer sheath of the cable through the third insulating sheath. Above-mentioned insulating protective housing simple structure can realize wrapping soft joint and prefabricated joint wherein completely, connects the insulation that realizes whole cable behind the connection cable, and wherein the metal protective housing is used for playing intensity support and electric shield's effect.
The metal protective shell is made of copper. The shielding effect of the cable joint part is ensured.
The large-diameter end of the stress cone cylinder is provided with an arc-shaped end surface. The curved end faces are used for homogenizing the electric field.
And the insulating sheath is provided with a grounding tube. For achieving cable grounding.
Compared with the prior art, the invention has the advantages that: through the combination of the soft joint and the prefabricated joint, the place (the conductor butt joint part of two cables) with the largest field intensity concentration (easy breakdown) is solved by using the soft joint mode with a simple sleeving structure, the place with the small field intensity concentration (relatively difficult breakdown) is solved by using the sleeving prefabricated joint mode, wherein the soft joint is used for realizing the connection of two cable conductors and the insulation recovery of a whole cable main body, and the prefabricated joint is used for realizing the physical insulation partition of a cable metal sheath, so that the requirements of the cross interconnection of the cables are met, the cable is easy to manufacture and install, and the integral use safety performance is better.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention cut through to a cable;
FIG. 2 is a schematic sectional view showing a flexible joint according to the present invention;
FIG. 3 is a schematic cross-sectional view of a prefabricated joint according to the present invention;
fig. 4 is a schematic cross-sectional view of the semiconductive housing of fig. 3 with the semiconductive housing removed.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in the figure, the high-voltage-level cross-linked polyethylene cable insulation joint comprises a soft joint A and a prefabricated joint B used for realizing cross interconnection, wherein the soft joint A is sleeved and coated outside a conductor C1 where two cables C are mutually butted, the outer shielding layer C2 of one cable C is sleeved and coated outside the prefabricated joint B, an insulation protection shell D is coated outside the soft joint A and the prefabricated joint B, and two ends of the insulation protection shell D are respectively coated outside the outer sheaths C3 of the two cables C.
In this specific embodiment, the flexible joint a has a left-right through socket mounting cavity a1, an annular cladding wall a2 is convexly disposed on the inner wall of the socket mounting cavity a1, a conductor cladding cavity A3 is formed in the annular cladding wall a2, the conductors C1 of the two cables C are stripped and then respectively extend into the conductor cladding cavity A3 from the left end and the right end of the socket mounting cavity a1 to be butted, the inner wall of the annular cladding wall a2 is tightly attached to the outer walls of the conductors C1 of the two cables C, the inner walls at the two ends of the socket mounting cavity a1 are tightly attached to the outer wall of the insulating layer C4 stripped from the two conductors C1, and the left end face and the right end face of the annular cladding wall a2 are respectively tightly attached to the side faces of the insulating layer C4 stripped from the two conductors C1 at corresponding positions. The cable C-shaped conductor C-1 connection structure has the advantages that the structure is simple, the full-cladding sleeving of the two butt-joint conductors C1 is realized, the connection of the two cable C-shaped conductors C1 and the insulation recovery of the whole cable C main body are realized, and meanwhile, the use safety is effectively improved.
In this embodiment, the left end surface of the annular enclosing wall a2 is a tapered surface with a gradually decreasing inner diameter from left to right, and the right end surface of the annular enclosing wall a2 is a tapered surface with a gradually increasing inner diameter from left to right. The distribution of the electric field can be effectively equalized.
In this embodiment, the left end face of the annular cladding wall a2 and the right end face of the annular cladding wall a2 are arranged in mirror symmetry, and the taper of the tapered face is 7 to 9 °. The flatter the taper, the more uniform the electric field distribution.
In this specific embodiment, the prefabricated joint B includes two semi-conductive sleeves B1, the two semi-conductive sleeves B1 are respectively installed on the outer shielding layer C2 of one of the cables C in a tight-fitting and sleeved manner, opposite ends of the two semi-conductive sleeves B1 are respectively provided with a truncated cone-shaped stress cone B2 in an extending manner, large-diameter ends of the two stress cones B2 are close to each other and spaced, the two stress cones B2 are connected in a wrapping manner through an insulating outer shell B3, the insulating outer shell B3 includes an outer insulating layer B31 wrapped outside the two stress cones B2 and an inner insulating layer B32 wrapped between the large-diameter ends of the two stress cones in an embedding manner, the outer insulating layer B31 and the inner insulating layer B32 are integrally arranged, and the semi-conductive sleeves B1 extend out of the outer side of the insulating outer shell B3. The structure better realizes the physical insulation and separation of the metal sheath of the cable C and better meets the requirement of cross interconnection of the cable C, wherein the stress cone B2 arranged on the semi-conductive sleeve B1 mainly plays a role in homogenizing an electric field.
In this embodiment, an annular recess B33 is disposed at the left end or the right end of the insulating housing B3, a semi-conductive housing B4 is sleeved on the annular recess B33, and the end of the semi-conductive housing B4 is bent to cover the end of the insulating housing B3. The function of equalizing the electric field intensity is performed by the semiconductive outer shell B4.
In this embodiment, the insulating protective case D includes a first insulating layer D1 covering the outer portions of the soft joint a and the prefabricated joint B, the first insulating layer D1 includes a main body insulating section D11 for completely covering the soft joint a and the prefabricated joint B and end insulating sections D12 integrally connected to both ends of the main body insulating section D11 for covering the outer portions of the metal shielding layers C5 of the two cables C, the outer portions of the end insulating sections D12 and the outer portions of both ends of the main body insulating section D11 are covered with a metal protective case D2, the two metal protective cases D2 are connected by a first insulating sleeve D3, a first insulating sleeve D3 is covered and arranged on the outer wall of the main body insulating section D11, the outer portion of the metal protective case D2 is covered with an insulating sheath D4, the two insulating sheaths D4 are connected by a second insulating sleeve D5, and the insulating sheath D4 and the outer sheath C3 of the cable C are connected by a third insulating sheath D5. The insulating protective shell D is simple in structure, the soft connector A and the prefabricated connector B can be completely wrapped in the insulating protective shell D, the whole cable C is insulated after the cable C is connected with the insulating protective shell D, and the metal protective shell D2 is used for achieving the effects of strength support and electric shielding.
In this embodiment, the material of the protective metal shell D2 is copper. The shielding effect of the cable joint part is ensured.
In this particular embodiment, the large diameter end of the stress cone B2 has an arcuate end face B21. The curved end face B21 serves to homogenize the electric field.
In this particular embodiment, a grounding tube D6 is provided on the insulating sheath D4. For achieving cable C grounding.
Claims (10)
1. The utility model provides a high voltage level crosslinked polyethylene cable insulation joint, its characterized in that includes soft joint and the prefabricated joint who is used for realizing crossing interconnection, soft joint cup joint the cladding and set up in the conductor outside that two cables butted each other, one of them the outside of the outer shielding layer of cable cup joint the cladding and be provided with prefabricated joint, soft joint with the outside cladding of prefabricated joint be provided with the insulation protection shell, the both ends of insulation protection shell cladding respectively set up the outside at the oversheath of two cables.
2. The high-voltage grade crosslinked polyethylene cable insulation joint as claimed in claim 1, wherein the soft joint has a left and right through sheathing installation cavity, the inner wall of the sheathing installation cavity is convexly provided with an annular cladding wall, a conductor cladding cavity is formed in the annular cladding wall, the conductors of the two cables are stripped and then respectively extend into the left end and the right end of the sheathing installation cavity and enter the conductor cladding cavity for butt joint, the inner wall of the annular cladding wall is tightly attached to the outer walls of the conductors of the two cables, the inner walls at the two ends of the sheathing installation cavity are tightly attached to the outer walls of the insulation layers stripped from the two conductors, and the left end face and the right end face of the annular cladding wall are respectively tightly attached to the side stripping faces of the insulation layers of the two conductors at the corresponding positions.
3. The insulation joint for high voltage grade crosslinked polyethylene cable according to claim 2, wherein the left end surface of the annular covering wall is a tapered surface with gradually decreasing inner diameter from left to right, and the right end surface of the annular covering wall is a tapered surface with gradually increasing inner diameter from left to right.
4. The insulated joint of high voltage grade crosslinked polyethylene cable according to claim 3, wherein the left end surface of the annular cladding wall and the right end surface of the annular cladding wall are arranged in mirror symmetry, and the taper of the tapered surface is 7-9 °.
5. The insulated joint of high voltage class cross-linked polyethylene cable according to claim 1, wherein the prefabricated joint comprises two semi-conductive sleeves, the two semi-conductive sleeves are respectively installed on the outer shielding layer of one cable in a tight-fitting and sleeved manner, opposite ends of the two semi-conductive sleeves are respectively provided with a truncated cone-shaped stress cone in an extending manner, large-diameter ends of the two stress cones are close to each other and are arranged at intervals, the two stress cones are connected in a wrapping manner through an insulating shell, the insulating shell comprises an outer insulating layer which is coated outside the two stress cone barrels and an inner insulating layer which is embedded between the large-diameter ends of the two stress cones, the outer insulating layer and the inner insulating layer are integrally arranged, and the semi-conductive sleeve extends out of the outer side of the insulating shell.
6. The insulated joint of the high-voltage grade crosslinked polyethylene cable according to claim 5, wherein the left end or the right end of the insulated shell is provided with an annular recess, the annular recess is sleeved with a semi-conductive shell, and the end of the semi-conductive shell is bent and wrapped on the end of the insulated shell.
7. The insulated joint of high voltage grade crosslinked polyethylene cable according to claim 1, wherein the insulation protection case comprises a first insulation layer covering the soft joint and the prefabricated joint, the first insulation layer comprises a main insulation section for completely covering the soft joint and the prefabricated joint and end insulation sections integrally connected to both ends of the main insulation section for covering the metal shielding layers of the two cables, a metal protection case is covered on the outer portion of the end insulation section and the outer portions of both ends of the main insulation section, two metal protection cases are connected through a first insulation sleeve, the first insulation sleeve is covered on the outer wall of the main insulation section, and the outer protection of the metal protection case is provided with an insulation sheath, the two insulating sheaths are connected through a second insulating sleeve, and the insulating sheaths are connected with the outer sheath of the cable through a third insulating sheath.
8. A high voltage grade crosslinked polyethylene cable insulation joint as claimed in claim 7, wherein said metal protective covering is copper.
9. A high voltage grade cross-linked polyethylene cable insulation joint as claimed in claim 5, wherein said stress cone has an arcuate end face at its large diameter end.
10. The insulated joint for high voltage grade crosslinked polyethylene cables according to claim 7, wherein the insulating sheath is provided with a grounding tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110418628.3A CN113315086A (en) | 2021-04-19 | 2021-04-19 | High-voltage-grade crosslinked polyethylene cable insulation joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110418628.3A CN113315086A (en) | 2021-04-19 | 2021-04-19 | High-voltage-grade crosslinked polyethylene cable insulation joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113315086A true CN113315086A (en) | 2021-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110418628.3A Pending CN113315086A (en) | 2021-04-19 | 2021-04-19 | High-voltage-grade crosslinked polyethylene cable insulation joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113315086A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007318945A (en) * | 2006-05-26 | 2007-12-06 | Exsym Corp | Connector for power cable |
| JP2011078162A (en) * | 2009-09-29 | 2011-04-14 | Swcc Showa Cable Systems Co Ltd | Rubber unit for connection of power cable |
| CN102593764A (en) * | 2012-03-16 | 2012-07-18 | 江苏亨通高压电缆有限公司 | Method for manufacturing flexible joint of large-length submarine cable |
| CN206272207U (en) * | 2016-11-30 | 2017-06-20 | 宜昌信通电缆有限公司 | A kind of DC ultra-high-voltage crosslinked cable connecting hose |
| CN207218215U (en) * | 2017-09-15 | 2018-04-10 | 长缆电工科技股份有限公司 | The combination prefabricated transition joint of one kind ± 500kV direct current cables |
| CN207218211U (en) * | 2017-09-15 | 2018-04-10 | 长缆电工科技股份有限公司 | One kind ± 500kV direct current cables Integral prefabricated type middle joints |
| CN209844528U (en) * | 2019-04-28 | 2019-12-24 | 江苏安靠智能输电工程科技股份有限公司 | Joint structure suitable for 35kV and following well low voltage cable |
| CN111585063A (en) * | 2019-02-19 | 2020-08-25 | 安徽省浩辉电力技术有限公司 | Preparation method of integrally prefabricated intermediate joint |
| WO2020221897A1 (en) * | 2019-05-01 | 2020-11-05 | Brugg Kabel Ag | Repair and replacement of high voltage cables and joints |
-
2021
- 2021-04-19 CN CN202110418628.3A patent/CN113315086A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007318945A (en) * | 2006-05-26 | 2007-12-06 | Exsym Corp | Connector for power cable |
| JP2011078162A (en) * | 2009-09-29 | 2011-04-14 | Swcc Showa Cable Systems Co Ltd | Rubber unit for connection of power cable |
| CN102593764A (en) * | 2012-03-16 | 2012-07-18 | 江苏亨通高压电缆有限公司 | Method for manufacturing flexible joint of large-length submarine cable |
| CN206272207U (en) * | 2016-11-30 | 2017-06-20 | 宜昌信通电缆有限公司 | A kind of DC ultra-high-voltage crosslinked cable connecting hose |
| CN207218215U (en) * | 2017-09-15 | 2018-04-10 | 长缆电工科技股份有限公司 | The combination prefabricated transition joint of one kind ± 500kV direct current cables |
| CN207218211U (en) * | 2017-09-15 | 2018-04-10 | 长缆电工科技股份有限公司 | One kind ± 500kV direct current cables Integral prefabricated type middle joints |
| CN111585063A (en) * | 2019-02-19 | 2020-08-25 | 安徽省浩辉电力技术有限公司 | Preparation method of integrally prefabricated intermediate joint |
| CN209844528U (en) * | 2019-04-28 | 2019-12-24 | 江苏安靠智能输电工程科技股份有限公司 | Joint structure suitable for 35kV and following well low voltage cable |
| WO2020221897A1 (en) * | 2019-05-01 | 2020-11-05 | Brugg Kabel Ag | Repair and replacement of high voltage cables and joints |
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Application publication date: 20210827 |