US3828115A - High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof - Google Patents

High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof Download PDF

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Publication number
US3828115A
US3828115A US00383323A US38332373A US3828115A US 3828115 A US3828115 A US 3828115A US 00383323 A US00383323 A US 00383323A US 38332373 A US38332373 A US 38332373A US 3828115 A US3828115 A US 3828115A
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US
United States
Prior art keywords
insulation
high voltage
shield
core
cable
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Expired - Lifetime
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US00383323A
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English (en)
Inventor
A Hvizd
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Hubbell Inc
Kerite Co
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Kerite Co
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Publication date
Application filed by Kerite Co filed Critical Kerite Co
Priority to US00383323A priority Critical patent/US3828115A/en
Priority to BR4558/74A priority patent/BR7404558A/pt
Priority to GB2814674A priority patent/GB1437742A/en
Priority to FR7426013A priority patent/FR2238999B3/fr
Priority to IT69392/74A priority patent/IT1016713B/it
Priority to DE2436413A priority patent/DE2436413A1/de
Application granted granted Critical
Publication of US3828115A publication Critical patent/US3828115A/en
Assigned to HUBBELL INCORPORATED reassignment HUBBELL INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KERITE COMPANY THE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
    • H02G15/072—Cable terminating boxes, frames or other structures with devices for relieving electrical stress of the condenser type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0291—Disposition of insulation comprising two or more layers of insulation having different electrical properties
    • 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
    • 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

Definitions

  • a field refraction barrier is disposed within the insulation to relax the electrical stress concentra tions which would otherwise be encountered due to surface impurities at the interfacial boundries of the multiple layer construction.
  • this field refraction barrier disperses the voltage gradient therebetween at terminations and splices and therefore, stress relief cones can be omitted therefrom 10 Claims, 6 Drawing Figures [56] References Cited UNITED STATES PATENTS 1,458,803 6/1923 Burley et a1 174/121 R 2,782,248 2/1957 Clark 174/120 R x m many mstances' 3,160,703 12/1964 Muller 174/120 R I 14 1 ⁇ L MIG V6 11111 II INSULNT N I,llllllzlrlllllllrlllll"illllll"IIIIIIIIIIIIIII” PMENTEB B 1 74 SHEET 1 OF 2 NW 3 V wwv HIGH VO
  • An insulating material of low specific inductive capacity (hereinafter SIC) is utilized in two or more layers and an insulating material of high SIC is utilized as a field refracting barrier between the layers of low SIC material.
  • SIC low specific inductive capacity
  • Each layer of high SIC material is thin relative to each layer of low SIC material to optimize the dielectric strength of the insulation for minimized dielectric losses.
  • FIG. 1 is a cross-sectional view of a high voltage cable having the multiple layer insulation construction of this invention
  • FIG. 2 is a longitudinal cross-sectional view thereof with a simplified termination made thereto;
  • FIG. 3 is a side elevational view thereof with comparison voltage gradient lines emitting therefrom to illustrate the improved electrical conditions resulting at terminations and splices due to the multiple layer insulation construction of this invention
  • FIG. 4 is a cross-sectional view of another high voltage cable having the multiple layer insulation construction of this invention.
  • FIG. 5 is a longitudinal cross-sectional view of a joint between two high voltage cables having the multiple layer insulation construction of this invention.
  • FIG. 6 is-a cross-sectional view of a further construction of high voltage cable having the multiple layer insulation of this invention and having semi-conductive layers adjacent the core and shield.
  • FIG. 1 illustrates a high voltage cable 10 having the multiple layer insulation construction of this invention.
  • the cable 10 includes a load conductor 12 and a shield conductor 14 in coaxial arrangement.
  • An insulation 16 of multiple layer construction is disposed between the load conductor 12 and the shield conductor 14.
  • the bulk of the insulation 16 is a low SIC insulating material and is disposed in two layers 18.
  • high SIC insulating material is disposed as layer 20 between the layers 18.
  • insulating materials have particular electrical characteristics by which they are clearly distinguishable from semi-conductive materials used so frequently in high voltage cables.
  • An insulating material is characterized by a very high resistivity at room temperature (above 10 ohms-centimeters), a good dielectric strength (above 100 volts per mil), and measurable values of SIC; whereas a semi-conductive material is characterized by a room temperature resistivity below l ohms-centimeters, virtually no dielectric strength and immeasurably high values of SIC.
  • Typical of the insulating materials utilized in high voltage cables are natural or synthetic rubber compositions and thermoplastic polyolefms, such as polyethylene and its compositions, or blends thereof.
  • the radial thickness of insulation attainable from conventional extrusion processes is limited for many reasons. Since the insulating material is semi-fluid when applied by such processes, it only solidifies after curing for a period of time. Therefore, as the radial thickness of insulation applied by a single extrusion pass is increased, the greater the tendency is for it to run or sag into irregular configurations. Furthermore, bubbles or air pockets are inherently present in the semi-fluid insulation applied by an extrusion process and therefore, voids are created in the insulation by those bubbles which are entrapped upon solidification.
  • the voids therein will be fewer; however, impurities are inherent on the outer surface of each layer and electrical stress concentrates at these impurities to decrease the dielectric strength of the insulation.
  • the cable 10 is utilized for electrical power transmission lines and is connected to conduct current through the load conductor 12 at high voltages with the shield conductor 14 grounded.
  • the multiple layers 18 and 20 of the insulation 16 are configured and arranged to optimize both the dielectric strength thereacross and the dielectric losses of the cable 10. This is so because fewer voids exist in the low SIC layers 18 than would otherwise have existed therein if the optimum thickness thereof had been applied as a single layer.
  • the high SIC layer 20 establishes a refraction barrier to relax the electrical stress concentrations which result at the surface impurities on the innermost layer 18.
  • the electric field intensity and the electric flux density are coincident vectors which refract at the boundary of different dielectric materials in such a manner that the tangent function ratio of the angles to the normal is equal to the dielectric constant ratio of the materials.
  • Terminations and splices to the cable 10 are also simplified, due to the refraction barrier.
  • a splice is made by joining the discontinuous ends of the core 12 with a splicing lug 21 to establish electrical continuity therebetween.
  • the shield 14 includes means 15 for establishing electrical continuity around the splicing lug 21 at a distance therefrom.
  • shield continuity means 15 are known in the art, such as the very simple soldered connection.
  • the air space thereby created between the splicing'lug 21 and shield 14 serves as an electrical insulation therebetween.
  • any insulation material could otherwise be disposed to occupy the air space, if desired.
  • a termination is made by peeling the shield conductor 14 back from the end of the cable 10 and by removing the insulation 16 from a portion of the load conductor 12.
  • a lug 22 is affixed to the load conductor 12 and moisture seals 24 and 26 are applied between the insulation 16 and the shield conductor 14 and lug 22 respectively, as shown in phantom lines.
  • the shielding seal 24 is simplified relative to those in common use because no stress relief cone exists therein. Such cones would normally be required to disperse thevoltage gradient between the load conductor 12 and the shield conductor 14 at the end of the cable 10 and would be precisely shaped and positioned within the shielding seal 24 which would, therefore, be made more complicated and costly.
  • the voltage gradient is dispersed by the cable 10 without the use of a stress relief cone due to the effect of the refraction barrier on the electric field intensity and electric flux density vectors, as previously discussed.
  • the ability of a cable to withstand breakdown at terminations and splices increases as the voltage gradient is dispersed in broader patterns.
  • a typical voltage gradient pattern at a termination with the high voltage cable of this invention is shown in FIG.
  • the refraction barrier can be attained within the insulation 16 without regard to thickness of layer 20 or the ratio of thicknesses between layers 18 and 20.
  • the principles of electrical field theory teach that in an insulation having equal thicknesses of high and low SIC materials, the voltage gradient distributed across each material is inversely proportional to' the ratio of the SIC values. Therefore, the greater the difference in SIC values, the less the voltage gradient across the high SIC material and the greater the voltage gradient across the low SIC material.
  • dielectric losses are minimized in the cable when the insulation 16 is of optimum thickness and dielectric strength, so that layers 18 should be of much greater thickness than layer to distribute the overwhelming portion of the voltage gradient across the low SIC material.
  • the insulation 16 of one typical high voltage cable 10 made according to this invention has an overall thickness of approximately 560 mils with the low SIC material layers 18 being a relatively greater thickness than the high SIC material layer 20 by a factor of 7.
  • the high to low ratio thereof can be from approximately 2.5 to approximately 25.
  • Another benefit of this invention is the electron trapping or energy absorption that occurs at the interface between the thin high SIC layer and the thick low SIC materials. This further improves the dielectric strength of this construction as compared to conventional designs having the same overall dimensions.
  • more than two layers of low SIC material may be utilized in a high voltage cable under the concept of this invention. Additional layers of high SIC material can also be disposed in a cable having the refraction barrier of this invention for conventional purposes.
  • a cable 10 exemplifying these possibilities is shown in FIG. 4 where because of the similarities which exist with cable 10 of FIG. 1, like items are identified by the same reference numerals but with a prime added.
  • the low SIC material is disposed in three layers 18 with layers 20' of high SIC materials disposed between each adjoining layer 18'. Additional layers 28 of high SIC materials are disposed between the insulation 16 and each of the coaxial conductors 12' and 14' for conventional reasons.
  • a cable 10" exemplifying such possibilities is shown in FIG. 6 where because of the similarities which exist with cable 10 of FIG. 1, like terms are identified by the same reference numerals, but with a double prime added.
  • An insulation 16" of multiple layer construction is disposed between a load conductor 12" and a shield conductor 14".
  • the bulk of the insulation 16" is a low SIC insulating material and is disposed in two layers 18".
  • high SIC insulating material is disposed as layer 20" between the layers 18".
  • Additional layers 30 of semi-conductive material are disposed to separate the insulation 16" from the core 12" and the shield 14".
  • the dielectric losses encountered with the high voltage cable of this invention are minimized due to the use of the field refraction barrier within the insulation to optimize thickness of the cable.
  • the field refraction barrier is also effective in dispersing the voltage gradient at terminations and splices of cables having coaxial conductors and therefore, stress relief cones can be omitted therefrom in many applications.
  • a high voltage cable comprising: a metallic core of high electrical conductivity; and electrical insulation disposed peripherally about and fully enclosing said core, said insulation being of multiple layer construction and having multiple layers of low specific inductive capacity material with at least one layer of high specific inductive capacity material disposed between adjacent layers thereof, said low specific inductive capacity material being not greater than 4.5 and said high specific inductive capacity material being not less than 10, said layers of low specific inductive capacity material being of sufficient total thickness to preclude breakdown thereacross at rated voltage, each said layer of high specific inductive capacity material creating a refraction barrier to the electrical field emitting from said core, each said refraction barrier being effective to minimize electrical stress concentration between said layers of low specific inductive capacity material in optimizing the dielectric strength thereof, said multiple layer construction being effective to minimize the dielectric losses in said cable.
  • each said layer of low specific inductive capacity material is at least 5 times the thickness of each said layer of high specific inductive capacity material.
  • a metallic shield of high electrical conductivity is disposed coaxially about said core and peripherally about said insulation said refraction barrier being effective to disperse voltage gradients between said core and said shield at terminations and splices of said cable.

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US00383323A 1973-07-27 1973-07-27 High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof Expired - Lifetime US3828115A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00383323A US3828115A (en) 1973-07-27 1973-07-27 High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof
BR4558/74A BR7404558A (pt) 1973-07-27 1974-06-03 Cabo de alta tensao
GB2814674A GB1437742A (enrdf_load_stackoverflow) 1973-07-27 1974-06-25
FR7426013A FR2238999B3 (enrdf_load_stackoverflow) 1973-07-27 1974-07-26
IT69392/74A IT1016713B (it) 1973-07-27 1974-07-26 Cavo elettrico ad alta tensione
DE2436413A DE2436413A1 (de) 1973-07-27 1974-07-29 Hochspannungskabel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00383323A US3828115A (en) 1973-07-27 1973-07-27 High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof

Publications (1)

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US3828115A true US3828115A (en) 1974-08-06

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US00383323A Expired - Lifetime US3828115A (en) 1973-07-27 1973-07-27 High voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereof

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US (1) US3828115A (enrdf_load_stackoverflow)
BR (1) BR7404558A (enrdf_load_stackoverflow)
DE (1) DE2436413A1 (enrdf_load_stackoverflow)
FR (1) FR2238999B3 (enrdf_load_stackoverflow)
GB (1) GB1437742A (enrdf_load_stackoverflow)
IT (1) IT1016713B (enrdf_load_stackoverflow)

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885085A (en) * 1974-06-11 1975-05-20 Gen Cable Corp High voltage solid extruded insulated power cables
US4032381A (en) * 1974-05-01 1977-06-28 General Cable Corporation Extruded solid dielectric high voltage cables with multi-layer insulation
US4361723A (en) * 1981-03-16 1982-11-30 Harvey Hubbell Incorporated Insulated high voltage cables
US4487996A (en) * 1982-12-02 1984-12-11 Electric Power Research Institute, Inc. Shielded electrical cable
EP0212832A3 (en) * 1985-08-08 1988-12-28 Pirelli General Plc Electric cables
US5416272A (en) * 1992-10-29 1995-05-16 Alcatel Cable Device for preventing insulation from shrinking back on a power cable having synthetic insulation
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
US6279850B1 (en) 1996-11-04 2001-08-28 Abb Ab Cable forerunner
US6340794B1 (en) 1995-09-06 2002-01-22 Minnesota Mining And Manufacturing Company Stress control for termination of a high voltage cable
US6357688B1 (en) 1997-02-03 2002-03-19 Abb Ab Coiling device
US6369470B1 (en) 1996-11-04 2002-04-09 Abb Ab Axial cooling of a rotor
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
US20020047268A1 (en) * 1996-05-29 2002-04-25 Mats Leijon Rotating electrical machine plants
US20020047439A1 (en) * 1996-05-29 2002-04-25 Mats Leijon High voltage ac machine winding with grounded neutral circuit
US6396187B1 (en) 1996-11-04 2002-05-28 Asea Brown Boveri Ab Laminated magnetic core for electric machines
US6417456B1 (en) * 1996-05-29 2002-07-09 Abb Ab Insulated conductor for high-voltage windings and a method of manufacturing the same
US6429563B1 (en) 1997-02-03 2002-08-06 Abb Ab Mounting device for rotating electric machines
US6439497B1 (en) 1997-02-03 2002-08-27 Abb Ab Method and device for mounting a winding
US6465979B1 (en) 1997-02-03 2002-10-15 Abb Ab Series compensation of electric alternating current machines
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
US6646363B2 (en) 1997-02-03 2003-11-11 Abb Ab Rotating electric machine with coil supports
US6825585B1 (en) 1997-02-03 2004-11-30 Abb Ab End plate
US6831388B1 (en) 1996-05-29 2004-12-14 Abb Ab Synchronous compensator plant
US6873080B1 (en) 1997-09-30 2005-03-29 Abb Ab Synchronous compensator plant
US6885273B2 (en) 2000-03-30 2005-04-26 Abb Ab Induction devices with distributed air gaps
US20050099258A1 (en) * 1997-02-03 2005-05-12 Asea Brown Boveri Ab Power transformer/inductor
US6970063B1 (en) 1997-02-03 2005-11-29 Abb Ab Power transformer/inductor
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
US6995646B1 (en) 1997-02-03 2006-02-07 Abb Ab Transformer with voltage regulating means
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
US7045704B2 (en) 2000-04-28 2006-05-16 Abb Ab Stationary induction machine and a cable therefor
US7061133B1 (en) 1997-11-28 2006-06-13 Abb Ab Wind power plant
US7141908B2 (en) 2000-03-01 2006-11-28 Abb Ab Rotating electrical machine
CN110672644A (zh) * 2019-09-04 2020-01-10 国网电力科学研究院武汉南瑞有限责任公司 电缆缓冲层状态评价方法及系统
EP3705515A1 (en) 2019-03-08 2020-09-09 Tyco Electronics UK Ltd. Elastomeric material

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1458803A (en) * 1922-02-06 1923-06-12 Boston Insulated Wire And Cabl Insulated electric wire
AT112537B (de) * 1926-07-31 1929-03-11 Victor Dr Planer Elektrisches Mehrleiterkabel für Hochspannung.
GB349289A (en) * 1929-05-28 1931-05-28 Siemens Ag Improvements in or relating to paper-insulated high tension electric cables
FR859507A (fr) * 1939-05-22 1940-12-20 Signaux Entr Electriques Perfectionnements aux cables et fils électriques
US2782248A (en) * 1951-06-01 1957-02-19 Gen Electric Electrical cable structure
US3160703A (en) * 1961-08-22 1964-12-08 Siemens Ag Laminated high-voltage insulation of coaxial electric conductors
US3287489A (en) * 1964-09-08 1966-11-22 Kerite Company Insulated high voltage cables
US3585274A (en) * 1969-09-15 1971-06-15 Minnesota Mining & Mfg Relief of dielectric stress in high voltage cable connections

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1458803A (en) * 1922-02-06 1923-06-12 Boston Insulated Wire And Cabl Insulated electric wire
AT112537B (de) * 1926-07-31 1929-03-11 Victor Dr Planer Elektrisches Mehrleiterkabel für Hochspannung.
GB349289A (en) * 1929-05-28 1931-05-28 Siemens Ag Improvements in or relating to paper-insulated high tension electric cables
FR859507A (fr) * 1939-05-22 1940-12-20 Signaux Entr Electriques Perfectionnements aux cables et fils électriques
US2782248A (en) * 1951-06-01 1957-02-19 Gen Electric Electrical cable structure
US3160703A (en) * 1961-08-22 1964-12-08 Siemens Ag Laminated high-voltage insulation of coaxial electric conductors
US3287489A (en) * 1964-09-08 1966-11-22 Kerite Company Insulated high voltage cables
US3585274A (en) * 1969-09-15 1971-06-15 Minnesota Mining & Mfg Relief of dielectric stress in high voltage cable connections

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032381A (en) * 1974-05-01 1977-06-28 General Cable Corporation Extruded solid dielectric high voltage cables with multi-layer insulation
US3885085A (en) * 1974-06-11 1975-05-20 Gen Cable Corp High voltage solid extruded insulated power cables
US4361723A (en) * 1981-03-16 1982-11-30 Harvey Hubbell Incorporated Insulated high voltage cables
US4487996A (en) * 1982-12-02 1984-12-11 Electric Power Research Institute, Inc. Shielded electrical cable
EP0212832A3 (en) * 1985-08-08 1988-12-28 Pirelli General Plc Electric cables
US5416272A (en) * 1992-10-29 1995-05-16 Alcatel Cable Device for preventing insulation from shrinking back on a power cable having synthetic insulation
US6340794B1 (en) 1995-09-06 2002-01-22 Minnesota Mining And Manufacturing Company Stress control for termination of a high voltage cable
US6919664B2 (en) 1996-05-29 2005-07-19 Abb Ab High voltage plants with electric motors
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
US6831388B1 (en) 1996-05-29 2004-12-14 Abb Ab Synchronous compensator plant
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
US20020047268A1 (en) * 1996-05-29 2002-04-25 Mats Leijon Rotating electrical machine plants
US20020047439A1 (en) * 1996-05-29 2002-04-25 Mats Leijon High voltage ac machine winding with grounded neutral circuit
US6822363B2 (en) 1996-05-29 2004-11-23 Abb Ab Electromagnetic device
US6417456B1 (en) * 1996-05-29 2002-07-09 Abb Ab Insulated conductor for high-voltage windings and a method of manufacturing the same
US6894416B1 (en) 1996-05-29 2005-05-17 Abb Ab Hydro-generator plant
US6936947B1 (en) 1996-05-29 2005-08-30 Abb Ab Turbo generator plant with a high voltage electric generator
US6891303B2 (en) 1996-05-29 2005-05-10 Abb Ab High voltage AC machine winding with grounded neutral circuit
US6906447B2 (en) 1996-05-29 2005-06-14 Abb Ab Rotating asynchronous converter and a generator device
US6279850B1 (en) 1996-11-04 2001-08-28 Abb Ab Cable forerunner
US6396187B1 (en) 1996-11-04 2002-05-28 Asea Brown Boveri Ab Laminated magnetic core for electric machines
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
US6369470B1 (en) 1996-11-04 2002-04-09 Abb Ab Axial cooling of a rotor
US6825585B1 (en) 1997-02-03 2004-11-30 Abb Ab End plate
US6995646B1 (en) 1997-02-03 2006-02-07 Abb Ab Transformer with voltage regulating means
US7046492B2 (en) 1997-02-03 2006-05-16 Abb Ab Power transformer/inductor
US20050099258A1 (en) * 1997-02-03 2005-05-12 Asea Brown Boveri Ab Power transformer/inductor
US6646363B2 (en) 1997-02-03 2003-11-11 Abb Ab Rotating electric machine with coil supports
US6357688B1 (en) 1997-02-03 2002-03-19 Abb Ab Coiling device
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
US6970063B1 (en) 1997-02-03 2005-11-29 Abb Ab Power transformer/inductor
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
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
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
EP3705515A1 (en) 2019-03-08 2020-09-09 Tyco Electronics UK Ltd. Elastomeric material
WO2020182582A1 (en) 2019-03-08 2020-09-17 Tyco Electronics Uk Ltd. Elastomeric Material
US12312454B2 (en) 2019-03-08 2025-05-27 Tyco Electronics Uk Ltd. Elastomeric material
CN110672644A (zh) * 2019-09-04 2020-01-10 国网电力科学研究院武汉南瑞有限责任公司 电缆缓冲层状态评价方法及系统

Also Published As

Publication number Publication date
GB1437742A (enrdf_load_stackoverflow) 1976-06-03
FR2238999A1 (enrdf_load_stackoverflow) 1975-02-21
FR2238999B3 (enrdf_load_stackoverflow) 1977-05-20
DE2436413A1 (de) 1975-02-06
IT1016713B (it) 1977-06-20
BR7404558A (pt) 1976-02-10

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