GB1574796A - Electrically insulated high voltage cable - Google Patents
Electrically insulated high voltage cable Download PDFInfo
- Publication number
- GB1574796A GB1574796A GB3446677A GB3446677A GB1574796A GB 1574796 A GB1574796 A GB 1574796A GB 3446677 A GB3446677 A GB 3446677A GB 3446677 A GB3446677 A GB 3446677A GB 1574796 A GB1574796 A GB 1574796A
- Authority
- GB
- United Kingdom
- Prior art keywords
- semiconductive layer
- carbon black
- layer
- voltage cable
- eva
- 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.)
- Expired
Links
- 239000006229 carbon black Substances 0.000 claims description 15
- 229920001577 copolymer Polymers 0.000 claims description 6
- 229920000098 polyolefin Polymers 0.000 claims description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 4
- 239000005977 Ethylene Substances 0.000 claims description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 4
- 150000001451 organic peroxides Chemical class 0.000 claims description 4
- 235000019241 carbon black Nutrition 0.000 description 14
- 239000012212 insulator Substances 0.000 description 9
- 238000001125 extrusion Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 239000003963 antioxidant agent Substances 0.000 description 4
- 235000006708 antioxidants Nutrition 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical group O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000872198 Serjania polyphylla Species 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 101000844801 Lactiplantibacillus plantarum (strain ATCC BAA-793 / NCIMB 8826 / WCFS1) D-alanyl carrier protein 2 Proteins 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000006232 furnace black Substances 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
Landscapes
- Conductive Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Laminated Bodies (AREA)
- Insulated Conductors (AREA)
- Organic Insulating Materials (AREA)
Description
(54) ELECTRICALLY INSULATED HIGH VOLTAGE CABLE
(71) We SUMITOMO ELECTRIC INDUSTRIES LTD., a Japanese Company of No.
15, Kitahama 5-chome, Higashi-ku, Osaka-shi, Osaka, Japan, do hereby declare the invention for which we pray that a Patent may be granted to us and the method by which it is to be performed to be particularly described in and by the following statement:
This invention relates to a high voltage cable electrically insulated with cross-linked polyolefin having an easily removable outer semiconductive layer, and is particularly intended to facilitate the removal of the outer semiconductive layer for cable joining.
The accompanying drawing is a cross-sectional view through a high voltage cable.
Referring to the drawing, the high voltage cable comprises an electrical conductor 1 having thereon, an inner semiconductive layer 2, an electrically insulating layer 3, and an outer semiconductive layer 4, the layer 4 serving to alleviate or shield the surroundings from an electric field generated by the electrical conductor 1 in use.
According to conventional techniques, this outer semi-conductive layer is formed by winding an electrically conductive tape therearound, or by extrusion-coatig thereon a compound obtained by mixing polyethylene, an ethylene/ethyl acrylate copolymer or an ethylene/vinyl acetate copolymer with electrically conductive carbon black and other additives such as talc, clay, calcium carbonate, magnesium oxide, zinc oxide, magnesium or zinc salts, anti-oxidants or cross-linking agents. Winding of tapes has the defect that the poor adhesion between the tape and the insulating layer adversely affects the electrical properties of the cable. In order to join one end of a cable to another, it is necessary to remove a predetermined length of the outer semiconductive layer. An extrusion-coated layer of the semiconductive compound cannot be removed as easily as can the tape. The extrusion-coated outer semiconductive layer should therefore be shaved off. However, a very high level of skill and much time are required to remove the outer semiconductive layer without damaging the surface of the insulating layer.
Outer semiconductive layers which adhere well to the insulator but can be easily removed at the time of joining cable ends have been developed (for example, as disclosed in U.S.
Patents 3,719,769 and 3,684,821). Such outer semiconductive layers are made by kneading conductive carbon black with an ethylene/vinyl acetate copolymer (EVA for short), the copolymer of EVA and vinyl chloride (EVA-PVC for short), or a mixture of EVA and
EVA-PVC, and can be easily peeled off at the time of working cable ends without damaging the surface of the insulators. Moreover, the semiconductive layers do not separate from the insulators when the cables are used. These conductive layers have sufficient peelability and processability for practical purposes. However, even with these outer semi-conductive layers, it is difficult to ensure complete removal of the semiconductive layer. In such cases, the remaining parts of the semiconductive layer must be removed by shaving or by wiping off with a solvent. Moreover, peroxide is added to the semiconductive layer to effect cross-linking thereof in such amount that the semiconductive layer has sufficient strength as an outer semiconductive layer (ordinarily 0.5 to 5 phr) with the result that, under some extrusion-processing conditions, small protrusions (termed "umber") form on the surface of the outer semiconductive layer or between the outer semiconductive layer and the insulating layer at the time when the cable is produced. When extruding compositions containing carbon, the temperature of the material increases due to heat generation by shearing and, when a cross-linking agent is present in the composition, cross-linking is often initiated by the heat thus generated. This provides "umber" and, because of this, it is very difficult to choose conditions of extrusion when a composition contains carbon and a cross-linking agent.
An object of the present invention is to obviate of mitigate the above disadvantages.
Conductive carbon blacks generally used heretofore are those having a surface area (measured by the BET method by nitrogen adsorption) of not more than 250 m2/g which are selected from acetylene black (having a surface area of about 60 m2/g) and furnace black (having a surface area of about 5 to 500 m2/g, for example). The outer semiconductive layer is produced by mixing 40 to 60 parts by weight of such carbon black with 100 parts of a resin.
According to the present invention, there is provided a high voltage cable electrically insulated with a cross-linked polyolefin having an easily removable outer semiconductive layer thereon, said semiconductive layer comprising 100 parts by weight of an ethylene/ vinyl acetate copolymer having a vinyl acetate content of 25 to 60% by weight, and 10 to 40 parts by weight of carbon black having a surface area of at least 900 m2/g, and being cross-linked with an organic peroxide having a half life of at least 10 hours at 1300C or higher.
High voltage cables for which the present invention is suitable are those produced according to specifications for Crosslinked Polyethylene Insulated Shielded Power Cable
Rated 5 to 69 KV, published by Association of Edison Illuminating Companies (AEIC) and those rated above 69 KV.
Preferably, the semiconductive layer has a specific electrical resistance of 1 x 101 to 9 x 104 ohm.cm.
The peel strength (kg/lOmm width), the condition of the insulator surface after removing the outer semiconductive layer, the conductivity (ohms.cm) of the semiconductive layer, and the extruding-mixing characteristics of the semiconductive layer of some examples of cross-linked polyolefin insulated high-voltage cables of this invention having insulating layers and semiconductive layers of different compositions and corresponding comparative examples were examined. More specifically, each of the insulating layers (8.5mm thick) was formed on a copper conductor having a cross-section of 100 mm2, and each of the outer semiconductive layers was extrusion-coated to a thickness of 1 mm on the insulating layer and cured with steam having a vapour pressure of 15.kg/cm2. Cuts with a width of 10mm were provided on the resulting cable, and the outer semiconductive layer was peeled off in the longitudinal direction of the cable. The peel strength of this time was measured with a tensile tester. The condition of the insulator surface after peeling off the outer semiconductive layer, the conductivity (volume inherent resistance) of the outer semiconductive layer, and the extruding-mixing characteristics of the semiconductive layer were also examined, and evaluated as described hereinbelow.
The results obtained are shown in the following table.
TABLE
Mixing-Extru
Peel Strength Condition of the Insu- Conductivity ding Character
Example or of the Semi- lator Surface after of the Semi- istics of the
Comparative conductive layer Peeling of the Semi- conductive Semi
Example No. Insulating Layer Semiconductive Layer (kg/10mm width) conductive Layer Layer conductive Layer (VA=35 wt%) (ohms.cm)
Ex. 1 Polyethylene EVA PHR (MI=6) 100 (Density 0.92g/cm3) PHR Carbon black (1) 2.5 Excellent 103 Excellent (MI=6) 100 (S=929m2/g) 10
DCP 2 YPO 2
Antioxidant 0.3 (VA=35 wt%)
Ex.2 EVA PHR (MI=6) 100
Same as in Carbon black (1) 20 3.0 Excellent 102 Excellent
Example 1 (S=929m2/g)
YPO 2 (VA=35 wt%)
Ex.3 EVA PHR (MI=6) 100
Same as in Carbon black (1) 3.2 Excellent 101 Good
Example 1 (S=929m2/g) 40
YPO 2 (VA=35 wt%)
CE. 1 EVA PHR (MI=6) 100
Same as in Carbon black (2) 3.2 Fair 102 Good
Example 1 (S=425m2/g 30
YPO 2 (VA=35 wt%)
CE. 2 EVA PHR (MI=6) 100
Same as in
Example Carbon black (1) - - 1 - 101 Poor (S=929m2/g) 60
YPO 2 TABLE (cont. .)
Example or Insulating Layer Semiconductive Layer Peel Strength Condition of the Insu- Conductivity Mixing-Extru
Comparative of the Semi- lator Surface after of the Semi- ding Character
Example No. conductive layer Peeling of the Semi- conductive istics of the Semi (kg/10mm width) conductive Layer Layer conductive Layer (VA=35 wt%) (ohms.cm)
CE. 3 EVA PHR (MI=6) 100
Same as in Carbon black (3) 3.5 Fair 102 Fair
Example 1 (S=250m2/g) 60
YPO 2 (VA=35 wt%)
CE. 4 EVA PHR (MI=6) 100
Same as in Carbon black (3) 3.2 Good 105 - 106 Good
Example 1 (S=250 m2/g) 30
YPO 2 (VA=35 wt%)
CE. 5 EVA PHR (MI=6) 100
Same as in Carbon black (4) 30 3.3 Fair 105 Good
Example 1 (S=60m2/g)
YPO 2 (VA=15 wt%)
CE.6 EVA PHR (MI=6) 100
Same as in Carbon black (1) > 5 Poor 102 Fair
Example 1 (S=929m2/g) 20
YPO 2
Ex. 4 (VA=25 wt%)
EVA PHR (MI=6) 100
Same as in Carbon black (1) 20 3.3 Good 102 Excellent
Example 1 (S=929m2/g)
YPO 2 TABLE (cont. .)
Example or Insulating Layer Semiconductive Layer Peel Strength Condition of the Insu- Conductivity Mixing-Extru
Comparative of the Semi- lator Surface after of the Semi- ding Character
Example No. conductive layer Peeling of the Semi- conductive istics of the Semi (kg/10mm width) conductive Layer Layer conductive Layer (VA=45 wt%)
Ex. 5 EVA PHR (ohms.cm) (MI=20) 100
Same as in Carbon black (1) 20 2.5 Excellent 102 Excellent
Example 1 (S=929m2/g)
YPO 2 (VA=60 wt%)
Ex. 6 EVA PHR (MI=20) 100
Same as in Carbon black (1) 20 2.0 Excellent 102 Excellent
Example 1 (S=929m2/g)
YPO 2 (VA=35 wt%)
CE. 7 EVA PHR (MI=6) 100
Same as in Carbon black (1) 20 > 5 Poor 102 Poor
Example 1 (S=929m2/g)
CDP 2 (VA=15 wt%) (VA=60 wt%)
Ex. 7 EVA PHR EVA PHR (MI=6) 100 (MI=20) 100
DCP 2 Carbon black (1) 20 2.8 Excellent 102 Excellent (S=929m2/g)
Antioxidant 0.3
YPO 2
Ex. 8
Polyethylene
Density 0.92) PHR (MI=2) 60 Same as in 2.9 Excellent 102 Excellent
Example 2
SBR 40
DCP 2
Antioxidant 0.3 Note
EVA: ethylene/vinyl acetate copolymer
VA: vinyl acetate content
MI: melt flow index (g/10 min.) measured by ASTM 1238
S: surface area of carbon black determined by the BET method by nitrogen
adsorption
SBR: styrene/butadiene copolymer with a styrene content of 23% by weight
DCP: dicumyl peroxide [C6H5C(CH3)2OOC(CH3)2C6H5] (the decomposition temperature required for obtaining a half life of 10 hours is 117"C) YPO: 2 ,5-dimethyl-2 ,5-di(tert . butylperoxy)hexyne-3
(the decomposition temperature required for obtaining a half life of 10 hours is 135"C) Carbon black (1) : Kejen black EC (a tradename for a product of Akzo Chemie,
Netherlands);
surface area; 929 m2/g (N2 adsorption method) and 480 m2/g (CTAB
adsorption method);
DPB oil adsorbing amount: 350 ml/100g; particle size: 20 to 30mull Carbon black (2) : CSX-99 (a tradename for a product of Cabot, U.S.A.); surface area
(N2 adsorption method): 425 m2/g; DBP oil absorbing amount 130 ml/100g.
Carbon black (3): VULCAN XC-72 (a product of Cabot, U.S.A. VULCAN is a
Registered Trade Mark); surface area (N2 adsorption method): 250 m2/g; DBP oil absorbing amount: 185 ml/100g; particle size: 30 mp.
Carbon black (4) : DENKABLACK (a trademark for a product of Denki Kagaku
Kogyo K.K.): Surface area (N2 absorption method): 60 m2/g: DBP
oil absorbing amount: 115 ml/lOOg: Particle size 40-90m.
The condition of the insulator surface after peeling off the semiconductive layer was evaluated using the following scale.
Excellent: Carbon, etc. did not remain.
Good: Conductive areas having a size of 0.5 mm or below remained
Fair: Conductive areas hving a size of about 0.5 to 1 mm remained.
Poor: The outer semiconductive layer ruptured, or large areas thereof remained.
The extruding-mixing characteristics were evaluated by the time which lapsed until small particles called umbers began to appear, and were rated as follows:
Excellent: No umber formed
Good: Umbers formed after one day
Fair: Umbers formed after several hours
Poor: Extrusion was impossible, or umbers appeared in 1 to 2 hours.
The semiconductive layers in the above examples contained 1 phr of zinc stearate as a processing aid, and 0.5 phr of 4,4'- thio-bis (3-methyl-6-tert-butyl-phenol) as an antioxidant.
The same antioxidant was used in the insulating layer as well.
The outer semiconductive layers prepared in accordance with this invention all had a peel strength of 2.0 to 3.2 kg/10 mm width, and a conductivity (volume inherent resistance) of 10 to 10 ohms. cm, and the condition of the insulator surface after peeling off the semiconductive surface, and the extrusion-mixing characteristics of the conductive layers were either good or excellent.
It can be seen from a comparison of the results obtained in Examples 1 to 3 and in
Comparative Example 2 that when the amount of carbon black is less than 10 parts by weight, conductivity cannot be obtained, and when the amount of carbon black exceeds 40 parts by weight, it is difficult to select conditions for mixing and extrusion.
It can also be seen from a comparison of the results obtained in Examples 2 and 4 to 6 and in Comparative Example 6 that when the vinyl acetate content is less than 15% by weight, the peel strength of the outer semiconductive layer becomes high, and spots remain on the peeled surface, and that when the vinyl acetate content is more than 60% by weight, the peel strength becomes less than 2 kg to cause extremely poor adhesion.
When the organic peroxide used to crosslink the outer semiconductive layer has a decomposition temperature, i.e., a temperature at which the half life is not more than 10 hours) lower than 1300C, it is difficult to extrude the conductive composition and to peel off the resulting semiconductive layer. Hence, organic peroxides having a decomposition temperature of at least 1300C must be used. (See the results for Example 2 and for
Comparative Example 7.)
It can be seen from the results obtained in Example 2 and Comparative Examples 1, 3, 4 and 5 that carbon black having a higher surface area can achieve a high conductivity and a good peeled surface when such is used in a smaller amount Carbon blacks having a surface area of at least about 900 mZ/g achieve especially marked inprovement over those now in use.
As can be seen from the results in Examples 7 and 8, similar results can be obtained when the insulator is made of polyolefins other than polyethylene, and polyolefin blends.
According to the present invention, the outer semiconductive layer has the same conductivity and peel strength as the outer semiconductive layers prepared by conventional methods, e.g., as described in U.S. Patent 3,719,769, etc. Moreover, after peeling, carbon particles, etc. do not remain on the surface of the insulator, and the peeled surface is clean.
The extrusion-processing conditions can be chosen from a wider range, and the extrusion of the outer semiconductive layer can be performed in good condition without difficulties such as the formation of umber.
Claims (3)
1. A high-voltage cable electrically insulated with a cross-linked polyolefin having an easily removable outer semiconductive layer thereon; said semiconductive layer comprising
100 parts by weight of an ethylene/vinyl acetate copolymer having a vinyl acetate content of 25 to 60% by weight, and 10 to 40 parts by weight of carbon black having a surface area of at least 900 m-/g, and being cross-linked with an organic peroxide having a half life of at least
10 hours at 1300C or higher.
2. A high-voltage cable as claimed in Claim 1, wherein said semiconductive layer has a specific electric resistance of 1 x 101 to 9 x 104 ohm.cm.
3. A high-voltage cable substantially as hereinbefore described in any one of Examples
1 to 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10040276A JPS5325886A (en) | 1976-08-21 | 1976-08-21 | Brid ged polyolefine insulating hightension cable having outer semiconductor layers which can be treated off easily |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1574796A true GB1574796A (en) | 1980-09-10 |
Family
ID=14272978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3446677A Expired GB1574796A (en) | 1976-08-21 | 1977-08-17 | Electrically insulated high voltage cable |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5325886A (en) |
| DE (1) | DE2737487B2 (en) |
| FR (1) | FR2362477A1 (en) |
| GB (1) | GB1574796A (en) |
| IT (1) | IT1079845B (en) |
| SE (1) | SE434318B (en) |
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| EP0375828A3 (en) * | 1988-03-23 | 1991-01-30 | Union Carbide Corporation | Cable conductor shield |
| GB2350476A (en) * | 1999-05-28 | 2000-11-29 | Asea Brown Boveri | A power cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3034747C2 (en) * | 1980-09-15 | 1985-01-17 | kabelmetal electro GmbH, 3000 Hannover | Process for the production of a polymer mixture containing carbon black and its use for electrical cables |
| DK489080A (en) * | 1980-11-14 | 1982-05-15 | Jps Elteknik A S | high-voltage cable |
| DE3375619D1 (en) * | 1983-06-13 | 1988-03-10 | Mitsui Du Pont Polychemical | Semiconducting compositions and wires and cables using the same |
| GB8432608D0 (en) * | 1984-12-22 | 1985-02-06 | Bp Chem Int Ltd | Strippable laminate |
| JPS61232505A (en) * | 1985-04-06 | 1986-10-16 | 住友電気工業株式会社 | Cross-linked polyethylene insulated wire |
| IL80889A0 (en) * | 1985-12-17 | 1987-03-31 | Signatron | Signal source distortion compensator |
| DE8536122U1 (en) * | 1985-12-23 | 1987-04-16 | Krieger, geb. Erfurt, Hildegard, 4800 Bielefeld | Strip for the supply of electrical power and/or for tele- or control communications |
| JPH0615219U (en) * | 1992-07-27 | 1994-02-25 | 住友電気工業株式会社 | Urethane resin coated wire |
| SE510819C2 (en) * | 1997-02-14 | 1999-06-28 | Ifoe Ceramics Ab | Electric high voltage insulator with a semiconducting surface layer |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3259688A (en) * | 1964-01-02 | 1966-07-05 | Gen Electric | High voltage insulated electrical cable with layer of irradiated semiconductive ethylene copolymer |
| FR1486230A (en) * | 1965-07-09 | 1967-10-04 | ||
| NL6609498A (en) * | 1965-07-09 | 1967-01-10 | ||
| DE2051268B2 (en) * | 1970-06-13 | 1972-09-14 | Sumitomo Electric Industries Ltd., Osaka (Japan) | INSULATED CABLE |
| FR2108171A1 (en) * | 1970-09-29 | 1972-05-19 | Sumitomo Electric Industries | Insulated electric cable - incorporating an insulating layer and an easily strippable semiconductor layer |
| US3876462A (en) * | 1972-05-30 | 1975-04-08 | Essex International Inc | Insulated cable with layer of controlled peel strength |
| US3787255A (en) * | 1972-05-30 | 1974-01-22 | Essex International Inc | Insulated cable with sheath of controlled peel strength and method |
| JPS49114075A (en) * | 1973-03-08 | 1974-10-31 | ||
| CA1084696A (en) * | 1975-05-07 | 1980-09-02 | Lucio Ongchin | Insulated electrical conductors |
| JPS51132484A (en) * | 1975-05-14 | 1976-11-17 | Furukawa Electric Co Ltd:The | Semiconductive composed material for power cable |
-
1976
- 1976-08-21 JP JP10040276A patent/JPS5325886A/en active Pending
-
1977
- 1977-08-17 GB GB3446677A patent/GB1574796A/en not_active Expired
- 1977-08-19 SE SE7709383A patent/SE434318B/en unknown
- 1977-08-19 DE DE19772737487 patent/DE2737487B2/en not_active Withdrawn
- 1977-08-22 IT IT5073377A patent/IT1079845B/en active
- 1977-08-22 FR FR7725575A patent/FR2362477A1/en active Granted
Cited By (40)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0375828A3 (en) * | 1988-03-23 | 1991-01-30 | Union Carbide Corporation | Cable conductor shield |
| EP0334992A1 (en) * | 1988-03-29 | 1989-10-04 | Hitachi Cable, Ltd. | Easily peelable semiconductive resin composition |
| US4933107A (en) * | 1988-03-29 | 1990-06-12 | Hitachi Cable Ltd. | Easily peelable semiconductive resin composition |
| US6936947B1 (en) | 1996-05-29 | 2005-08-30 | Abb Ab | Turbo generator plant with a high voltage electric generator |
| US6940380B1 (en) | 1996-05-29 | 2005-09-06 | Abb Ab | Transformer/reactor |
| US6972505B1 (en) | 1996-05-29 | 2005-12-06 | Abb | Rotating electrical machine having high-voltage stator winding and elongated support devices supporting the winding and method for manufacturing the same |
| US6919664B2 (en) | 1996-05-29 | 2005-07-19 | Abb Ab | High voltage plants with electric motors |
| US6906447B2 (en) | 1996-05-29 | 2005-06-14 | Abb Ab | Rotating asynchronous converter and a generator device |
| US6894416B1 (en) | 1996-05-29 | 2005-05-17 | Abb Ab | Hydro-generator plant |
| US6891303B2 (en) | 1996-05-29 | 2005-05-10 | Abb Ab | High voltage AC machine winding with grounded neutral circuit |
| US6417456B1 (en) | 1996-05-29 | 2002-07-09 | Abb Ab | Insulated conductor for high-voltage windings and a method of manufacturing the same |
| US6376775B1 (en) | 1996-05-29 | 2002-04-23 | Abb Ab | Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor |
| US6831388B1 (en) | 1996-05-29 | 2004-12-14 | Abb Ab | Synchronous compensator plant |
| US6822363B2 (en) | 1996-05-29 | 2004-11-23 | Abb Ab | Electromagnetic device |
| US6577487B2 (en) | 1996-05-29 | 2003-06-10 | Asea Brown Boveri Ab | Reduction of harmonics in AC machines |
| US6279850B1 (en) | 1996-11-04 | 2001-08-28 | Abb Ab | Cable forerunner |
| US6261437B1 (en) | 1996-11-04 | 2001-07-17 | Asea Brown Boveri Ab | Anode, process for anodizing, anodized wire and electric device comprising such anodized wire |
| US6396187B1 (en) | 1996-11-04 | 2002-05-28 | Asea Brown Boveri Ab | Laminated magnetic core for electric machines |
| US6369470B1 (en) | 1996-11-04 | 2002-04-09 | Abb Ab | Axial cooling of a rotor |
| US6995646B1 (en) | 1997-02-03 | 2006-02-07 | Abb Ab | Transformer with voltage regulating means |
| US6828701B1 (en) | 1997-02-03 | 2004-12-07 | Asea Brown Boveri Ab | Synchronous machine with power and voltage control |
| US6465979B1 (en) | 1997-02-03 | 2002-10-15 | Abb Ab | Series compensation of electric alternating current machines |
| US6439497B1 (en) | 1997-02-03 | 2002-08-27 | Abb Ab | Method and device for mounting a winding |
| US6429563B1 (en) | 1997-02-03 | 2002-08-06 | Abb Ab | Mounting device for rotating electric machines |
| US6357688B1 (en) | 1997-02-03 | 2002-03-19 | Abb Ab | Coiling device |
| US6646363B2 (en) | 1997-02-03 | 2003-11-11 | Abb Ab | Rotating electric machine with coil supports |
| US6970063B1 (en) | 1997-02-03 | 2005-11-29 | Abb Ab | Power transformer/inductor |
| US7046492B2 (en) | 1997-02-03 | 2006-05-16 | Abb Ab | Power transformer/inductor |
| US6825585B1 (en) | 1997-02-03 | 2004-11-30 | Abb Ab | End plate |
| US6873080B1 (en) | 1997-09-30 | 2005-03-29 | Abb Ab | Synchronous compensator plant |
| US7019429B1 (en) | 1997-11-27 | 2006-03-28 | Asea Brown Boveri Ab | Method of applying a tube member in a stator slot in a rotating electrical machine |
| US6867674B1 (en) | 1997-11-28 | 2005-03-15 | Asea Brown Boveri Ab | Transformer |
| US6525265B1 (en) | 1997-11-28 | 2003-02-25 | Asea Brown Boveri Ab | High voltage power cable termination |
| US6525504B1 (en) | 1997-11-28 | 2003-02-25 | Abb Ab | Method and device for controlling the magnetic flux in a rotating high voltage electric alternating current machine |
| US7061133B1 (en) | 1997-11-28 | 2006-06-13 | Abb Ab | Wind power plant |
| US6801421B1 (en) | 1998-09-29 | 2004-10-05 | Abb Ab | Switchable flux control for high power static electromagnetic devices |
| GB2350476A (en) * | 1999-05-28 | 2000-11-29 | Asea Brown Boveri | A power cable |
| US7141908B2 (en) | 2000-03-01 | 2006-11-28 | Abb Ab | Rotating electrical machine |
| US6885273B2 (en) | 2000-03-30 | 2005-04-26 | Abb Ab | Induction devices with distributed air gaps |
| US7045704B2 (en) | 2000-04-28 | 2006-05-16 | Abb Ab | Stationary induction machine and a cable therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2737487B2 (en) | 1979-09-06 |
| IT1079845B (en) | 1985-05-13 |
| FR2362477B1 (en) | 1981-08-07 |
| SE434318B (en) | 1984-07-16 |
| JPS5325886A (en) | 1978-03-10 |
| DE2737487A1 (en) | 1978-03-16 |
| FR2362477A1 (en) | 1978-03-17 |
| SE7709383L (en) | 1978-02-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |