Source: http://www.google.com/patents/US7045704?dq=6,460,050
Timestamp: 2013-12-06 21:04:21
Document Index: 466752728

Matched Legal Cases: ['art 3', 'arts 11', 'arts 11', 'art 11', 'art 11', 'art 11', 'art 2', 'art 1']

Patent US7045704 - Stationary induction machine and a cable therefor - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Advanced Patent Search | Sign inAdvanced Patent SearchPatentsA stationary induction machine, and a cable for such an induction machine, including a winding including an elongate, flexible cable, having an electric lead, and a cooling device, arranged, with the aid of a coolant, to divert excess heat generated in the lead during operation of the induction machine....http://www.google.com/patents/US7045704?utm_source=gb-gplus-sharePatent US7045704 - Stationary induction machine and a cable thereforPublication numberUS7045704 B2Publication typeGrantApplication numberUS 10/258,740Publication dateMay 16, 2006Filing dateApr 19, 2001Priority dateApr 28, 2000Fee statusPaidAlso published asCA2407061A1, CA2407061C, CN1227679C, CN1426589A, DE60137227D1, EP1303862A1, EP1303862B1, US20030164245, WO2001084571A1Publication number10258740, 258740, US 7045704 B2, US 7045704B2, US-B2-7045704, US7045704 B2, US7045704B2InventorsClaes AreskougOriginal AssigneeAbb AbPatent Citations (106), Non-Patent Citations (95), Referenced by (1), Classifications (9), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetStationary induction machine and a cable thereforUS 7045704 B2Abstract A stationary induction machine, and a cable for such an induction machine, including a winding including an elongate, flexible cable, having an electric lead, and a cooling device, arranged, with the aid of a coolant, to divert excess heat generated in the lead during operation of the induction machine. The lead is in a form of a tube and surrounds a continuous channel for circulation of the coolant. The cable includes a cooling tube of a polymer material that is arranged in the lead and forms the channel.
1. A stationary induction machine comprising:
at least one winding, including an elongate, flexible cable, having an electric lead; and a cooling device, arranged, with aid of a coolant, to divert excess heat generated in the lead during operation of the induction machine; wherein the lead is in a form of a tube and surrounds a continuous channel for circulation of said coolant, and wherein the cable includes a cooling tube of a polymer material arranged in the lead and forming said channel. 2. An induction machine as claimed in claim 1, wherein the polymer material comprises cross-linked polyethylene.
3. An induction machine as claimed in claim 1, wherein a diffusion layer impermeable to the coolant is arranged on an envelope surface of the cooling tube.
4. An induction machine as claimed in claim 3, wherein the diffusion layer consists of polyethylene-laminated aluminum tape.
5. An induction machine as claimed in claim 1, wherein the coolant is a mixture of glycol and water.
6. An induction machine as claimed in claim 1, wherein the cable includes a fixed electrically insulating layer of a polymer material surrounding the lead.
7. An induction machine as claimed in claim 1, wherein the channel occupies a central part of the cable.
8. An elongate, flexible cable comprising:
an electric lead and a fixed electrically insulating layer of a polymer material surrounding the lead, which cable is configured to form a winding in a stationary induction machine, in which a cooling device is arranged, with aid of a coolant, to displace excess heat generated in the lead during operation of the induction machine, which lead is in a form of a tube and surrounds a continuous channel for circulation of said coolant, wherein the cable includes a cooling tube of polymer material arranged in the lead and forming said channel. 9. A cable as claimed in claim 8, wherein the polymer material comprises cross-linked polyethylene.
10. A cable as claimed in claim 8, wherein a diffusion layer impermeable to the coolant is arranged on an envelope surface of the cooling tube.
11. A cable as claimed in claim 8, wherein the channel occupies a central part of the cable.
TECHNICAL FIELD The present invention relates to a stationary induction machine including
at least one winding including at least one elongate, flexible cable having an electric lead, and a cooling device arranged, with the aid of a coolant, to divert excess heat generated in the lead during operation of the induction machine,
where the lead is in the form of a tube and surrounds a continuous channel for the circulation of said coolant.
The invention also relates to a cable for such an induction machine.
The present invention especially relates to a stationary induction machine, and a cable for such, for system voltages exceeding 1 kilovolt.
In this context, �cable� denotes an electric lead surrounded by a fixed, continuous insulating material.
BACKGROUND ART In electric power systems for transmitting electric energy, it is known to use stationary induction machines with windings comprising cables. �Electric power systems� here denotes systems for voltages exceeding 1 kilovolt and �stationary induction machines� here denotes non-rotating induction machines, i.e. transformers and reactors.
A problem with the known cable-wound induction machines, especially in applications where large currents occur, is the difficulty of efficiently diverting the excess heat generated during operation because of Joule-effect losses in the lead of the cable. �Excess heat� here denotes the heat that causes the temperature in the induction machine to exceed a predetermined temperature, which is higher than the ambient temperature. A known method of providing cooling is to create flow paths, in which a coolant is induced to flow, between the winding turns. Usually, the cooling is forced, i.e. the coolant is induced to flow with the aid of a pump or a fan device.
In the cooling arrangement known through WO 98/34239 A1, the winding is designed with spacing elements that separate predetermined adjoining winding turns from each other. Flow paths in which a fan device induces a gas to flow, usually air, are thus created in the winding. In this context, hoods are commonly used to guide the gas stream into the winding. However, the above-mentioned cooling arrangements exhibit a number of drawbacks. First, placing the flow paths between adjoining winding turns means that the winding occupies a relatively large volume. This makes the induction machine relatively large, which in certain applications can be disadvantageous, for instance in transformers where a high filling factor in the winding is desired. The hoods, which guide the air stream into the winding, also contribute significantly to the size of the induction machine and, moreover, make the induction machine expensive to manufacture. Secondly, the flow paths constitute impairments in the winding, as adjoining winding turns separated by a flow path do not support each other. These impairments can make the winding sensitive to the forces that arise during short circuits in the electric power system. Thirdly, the present trend of development is towards ever-higher currents in the induction machines, which requires an ever-higher flow velocity for the coolant in gas-cooled induction machines to provide sufficiently effective cooling. This entails a large consumption of energy in the fan device.
In another known cooling arrangement, flow paths are created in the form of cooling tubes of an electrically insulating material, usually a polymer material, which cooling tubes extend through the winding between the winding turns. A pumping device pumps a liquid, such as de-ionized water, through the tubes. However, such arrangements cooled by liquid exhibit the same drawbacks as the arrangements cooled by gas described above, as the flow paths increase the volume of the winding and reduce its capacity to withstand short-circuit forces. In addition, a further problem arises. The permeability to liquids, at least to a limited extent, of polymer materials poses a risk of the cooling liquid permeating through the cooling tube and into the insulating layer surrounding the lead in the cable. The cooling liquid, in combination with the electrical alternating field that arises around the lead when an alternating current runs through the same during operation, can form so-called water trees in the insulating layer. This is undesirable, as the formation of water trees weakens the electrical insulating strength of the insulating layer. The formation of water trees can also occur in the cooling tubes, which is not desirable either.
Another cooling arrangement is known through GB 2332557 A, which describes a power cable for high-voltage induction apparatus. The power cable comprises an inner support or cooling tube of metal, through which a coolant flows. The aim is to cool the power cable to cryostatic temperatures and the cooling tube in question consists of metal, for instance an alloy of copper and nickel.
A cable-wound induction machine with a cooling tube of conducting material wound with the cable displays a great disadvantage, however. The disadvantage is that the magnetic flux in the induction machine induces electric currents in the cooling tube. This results in the cooling tube being heated and undesired losses arising. This problem increases with the frequency and the rated output of the electric power system in which the induction machine operates.
DESCRIPTION OF THE INVENTION The object of the present invention is to provide a stationary induction machine with a new cooling device that completely or partially overcomes the above-mentioned drawbacks and problems.
The induction machine and the cable in accordance with the invention are characterized in that the cable includes a cooling tube of a polymer material that is arranged in the lead and forms said channel.
Efficient cooling is provided by the channel being arranged inside the lead in that the coolant acts in the immediate vicinity of the heat source, i.e. the lead of the cable. The excess heat does not have to permeate through the insulating layer of the cable before said heat can be displaced by the coolant. Furthermore, the coolant acts in the area where temperature peaks, so-called �hot spots�, normally occur in conventional cables, namely in the central part of the cable, which makes the cooling yet more efficient. Furthermore the channel, by being placed inside the lead, is not subjected to the electrical alternating field generated by the current in the lead. Thus, the problem involving the formation of water trees in the cooling tube is avoided. Besides, by the channel being placed inside the lead, adjoining winding turns can be placed in close proximity to each other, which enables a stable winding construction for good absorption of short-circuit forces.
Induced currents in the cooling tube are avoided by the cooling tube being of a polymer material. The losses in an induction machine in accordance with the invention are thereby considerably reduced, as compared with cable-wound induction machines where the cable has a cooling tube of a conducting material. In addition, as compared with metal, polymer materials are flexible, which provides an easily manipulated cable and consequent advantages in the formation of the winding.
BRIEF DESCRIPTION OF THE DRAWINGS The invention will be explained further in the following with reference to the drawings, where
FIG. 1 shows schematically a cable-wound reactor,
FIG. 2 shows a cut-away part of the cable that forms part of the reactor in accordance with FIG. 1, and
FIG. 3 shows an end part of the cable in accordance with FIG. 1.
DESCRIPTION OF EMBODIMENTS FIG. 1 shows parts of a cable-wound stationary induction machine in the form of a reactor. The reactor is intended for connection between converters in a HVDC system (not shown) and a phase conductor in a HVAC system (not shown) to dampen the harmonics generated by the converters. The reactor comprises a support structure, not shown, carrying a cable 1 wound so that it forms a cylindrical winding 2, surrounding a central part 3 filled with air, which forms the air core of the reactor. In this connection, the cable 1 is arranged to carry an electric current to generate a magnetic flow in the air core 3. A cut-away part of the cable is shown in FIG. 2. The cable has a substantially circular cross-section and comprises an elongate, flexible cooling tube 4 arranged concentrically about its longitudinal axis, a diffusion layer 5 surrounding the cooling tube 4, a semiconducting layer 6 surrounding the diffusion layer 5, a lead 7 surrounding the semiconducting layer 6, a support layer 8 surrounding the lead 7 and, finally, an insulating layer 9 surrounding the support layer 8. The cooling tube 4 forms a channel 10 occupying the central part of the cable 1, in which channel 10 a coolant in the form of a mixture of glycol and water flows. The cooling tube 4 is made of a polymer material, preferably cross-linked polyethylene (XLPE). As polymer materials are permeable to liquids, at least to a limited extent, the diffusion layer 5 is arranged on the envelope surface of the tube to ensure that the glycol-water mixture does not permeate out into the outer parts of the cable 1 and cause the formation of water trees in the insulating layer 9. The diffusion layer 5 preferably consists of a polyethylene-laminated aluminium tape that is helically wound about the cooling tube 4, whereby a diffusion layer 5 is provided that is tight and in which only small electric currents are generated because of the magnetic flow in the air core 3 of the reactor. The semiconducting layer 6 arranged on the diffusion layer 5 consists of polyethylene mixed with pulverized coal, which forms the substructure for the lead 7 of the cable 1. The lead 7 is tubular. In the embodiment shown, it consists of a plurality of varnished aluminium wires disposed in close proximity to each other and wound in a layer on the semiconducting layer 6. The support layer 8 consists of a ribbon of polypropylene copolymer (PP copolymer), which is wound onto the lead 7 during manufacture of the cable 1 to prevent the polymer material of the insulating layer 9 from penetrating between the aluminium wires during the extrusion of the insulating layer 9 onto the cable 1. The insulating layer 9 preferably consists of XLPE.
The cable extends between two end parts 11, 12, each respectively located at one of the two opposing end surfaces of the helical winding 2. One of the end parts is shown in FIG. 3. The insulating layer 9 and the support layer 8 are removed from the cable 1 at the end parts 11, 12. The cooling tube 4, at each end part 11, 12, exits through an opening in the semiconducting layer 6 and the lead 7, together with the diffusion layer 5, and, at each end part 11, 12, is coupled up to a connection tube (not shown), which leads the mixture of glycol and water to a pumping and heat-exchanger device (not shown). The lead 7, after being separated from the cooling tube 4 at each end part 11, 12, is electrically coupled up to a connection coupling 13, 14, which connection couplings 13, 14 are connected to the converters (not shown) of the HVDC system and one of the phase conductors (not shown) of the HVAC system respectively.
The principle of the invention has been described above in relation to a cable-wound single-phase reactor with an air core. However, it should be understood that the invention is also applicable to other types of cable-wound, stationary induction machines, for instance, a cable-wound three-phase power transformer with an iron core.
In the above embodiment, the coolant is a mixture of glycol and water. However, in other applications, other coolants can be used, such as de-ionized water or a gaseous coolant, such as air. In certain applications, the diffusion layer can be omitted. However, it is of great importance that the constituent parts of the cable are flexible to allow supple forming of the cable during manufacture of the induction machine.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS681800Jun 18, 1901Sep 3, 1901Oskar LascheStationary armature and inductor.US847008Jun 10, 1904Mar 12, 1907Isidor KitseeConverter.US1304451Jan 29, 1917May 20, 1919 Locke hUS1418856May 2, 1919Jun 6, 1922Allischalmers Mfg CompanyDynamo-electric machineUS1481585Sep 16, 1919Jan 22, 1924Electrical Improvements LtdElectric reactive windingUS1508456Jan 4, 1924Sep 16, 1924Perfection Mfg CoGround clampUS1728915May 5, 1928Sep 24, 1929Earl P BlankenshipLine saver and restrainer for drilling cablesUS1742985May 20, 1929Jan 7, 1930Gen ElectricTransformerUS1747507May 10, 1929Feb 18, 1930Westinghouse Electric & Mfg CoReactor structureUS1756672Oct 12, 1922Apr 29, 1930Allis Louis CoDynamo-electric machineUS1762775Sep 19, 1928Jun 10, 1930Bell Telephone Labor IncInductance deviceUS1781308May 29, 1929Nov 11, 1930Ericsson Telefon Ab L MHigh-frequency differential transformerUS1861182Jan 31, 1930May 31, 1932Okonite CoElectric conductorUS1904885Jun 13, 1930Apr 18, 1933Western Electric CoCapstanUS1974406Dec 13, 1930Sep 25, 1934Herbert F AppleDynamo electric machine core slot liningUS2006170Apr 30, 1934Jun 25, 1935Gen ElectricWinding for the stationary members of alternating current dynamo-electric machinesUS2206856May 31, 1938Jul 2, 1940William E ShearerTransformerUS2217430Feb 26, 1938Oct 8, 1940Westinghouse Electric & Mfg CoWater-cooled stator for dynamoelectric machinesUS2241832May 7, 1940May 13, 1941Hugo W WahlquistMethod and apparatus for reducing harmonics in power systemsUS2251291Aug 10, 1940Aug 5, 1941Western Electric CoStrand handling apparatusUS2256897Jul 24, 1940Sep 23, 1941Cons Edison Co New York IncInsulating joint for electric cable sheaths and method of making sameUS2295415Aug 2, 1940Sep 8, 1942Westinghouse Electric & Mfg CoAir-cooled, air-insulated transformerUS2409893Apr 30, 1945Oct 22, 1946Westinghouse Electric CorpSemiconducting compositionUS2415652Jun 3, 1942Feb 11, 1947Kerite CompanyHigh-voltage cableUS2424443Dec 6, 1944Jul 22, 1947Gen ElectricDynamoelectric machineUS2436306Jun 16, 1945Feb 17, 1948Westinghouse Electric CorpCorona elimination in generator end windingsUS2446999Nov 7, 1945Aug 17, 1948Gen ElectricMagnetic coreUS2459322Mar 16, 1945Jan 18, 1949Allis Chalmers Mfg CoStationary induction apparatusUS2462651Jun 12, 1944Feb 22, 1949Gen ElectricElectric induction apparatusUS2498238Apr 30, 1947Feb 21, 1950Westinghouse Electric CorpResistance compositions and products thereofUS2650350Nov 4, 1948Aug 25, 1953Gen ElectricAngular modulating systemUS2721905Jan 19, 1951Oct 25, 1955Webster Electric Co IncTransducerUS2749456Jun 23, 1952Jun 5, 1956Us Electrical Motors IncWaterproof stator construction for submersible dynamo-electric machineUS2780771Apr 21, 1953Feb 5, 1957Vickers IncMagnetic amplifierUS2846599Jan 23, 1956Aug 5, 1958Wetomore HodgesElectric motor components and the like and method for making the sameUS2885581Apr 29, 1957May 5, 1959Gen ElectricArrangement for preventing displacement of stator end turnsUS2943242Feb 5, 1958Jun 28, 1960Pure Oil CoAnti-static grounding deviceUS2947957Apr 22, 1957Aug 2, 1960Zenith Radio CorpTransformersUS2959699Jan 2, 1958Nov 8, 1960Gen ElectricReinforcement for random wound end turnsUS2962679Jul 25, 1955Nov 29, 1960Gen ElectricCoaxial core inductive structuresUS2975309May 5, 1959Mar 14, 1961Komplex Nagyberendezesek ExporOil-cooled stators for turboalternatorsUS3014139Oct 27, 1959Dec 19, 1961Gen ElectricDirect-cooled cable winding for electro magnetic deviceUS3098893Mar 30, 1961Jul 23, 1963Gen ElectricLow electrical resistance composition and cable made therefromUS3130335Apr 17, 1961Apr 21, 1964Epoxylite CorpDynamo-electric machineUS3143269Jul 26, 1963Aug 4, 1964Crompton & Knowles CorpTractor-type stock feedUS3157806Nov 3, 1960Nov 17, 1964Bbc Brown Boveri & CieSynchronous machine with salient polesUS3158770Dec 14, 1960Nov 24, 1964Gen ElectricArmature bar vibration damping arrangementUS3197723Apr 26, 1961Jul 27, 1965Ite Circuit Breaker LtdCascaded coaxial cable transformerUS3268766Feb 4, 1964Aug 23, 1966Du PontApparatus for removal of electric charges from dielectric film surfacesUS3304599Mar 30, 1965Feb 21, 1967Teletype CorpMethod of manufacturing an electromagnet having a u-shaped coreUS3354331Sep 26, 1966Nov 21, 1967Gen ElectricHigh voltage grading for dynamoelectric machineUS3365657Mar 4, 1966Jan 23, 1968Nasa UsaPower supplyUS3372283Feb 15, 1965Mar 5, 1968AmpexAttenuation control deviceUS3392779Oct 3, 1966Jul 16, 1968Certain Teed Prod CorpGlass fiber cooling meansUS3400737 *Jul 7, 1966Sep 10, 1968Moore & Co SamuelComposite tubing product and apparatus for manufacturing the sameUS3411027Jul 8, 1965Nov 12, 1968Siemens AgPermanent magnet excited electric machineUS3418530Sep 7, 1966Dec 24, 1968Army UsaElectronic crowbarUS3435262Jun 6, 1967Mar 25, 1969English Electric Co LtdCooling arrangement for stator end plates and eddy current shields of alternating current generatorsUS3437858Nov 17, 1966Apr 8, 1969Glastic CorpSlot wedge for electric motors or generatorsUS3444407Jul 20, 1966May 13, 1969Gen ElectricRigid conductor bars in dynamoelectric machine slotsUS3447002Feb 28, 1966May 27, 1969Asea AbRotating electrical machine with liquid-cooled laminated stator coreUS3484690Aug 23, 1966Dec 16, 1969Herman WaldThree current winding single stator network meter for 3-wire 120/208 volt serviceUS3541221Dec 10, 1968Nov 17, 1970Comp Generale ElectriciteElectric cable whose length does not vary as a function of temperatureUS3560777Aug 12, 1969Feb 2, 1971Oerlikon MaschfElectric motor coil bandageUS3571690Oct 25, 1968Mar 23, 1971Voldemar Voldemarovich ApsitPower generating unit for railway coachesUS3593123Mar 17, 1969Jul 13, 1971English Electric Co LtdDynamo electric machines including rotor winding earth fault detectorUS3631519Dec 21, 1970Dec 28, 1971Gen ElectricStress graded cable terminationUS3644662Jan 11, 1971Feb 22, 1972Gen ElectricStress cascade-graded cable terminationUS3651244Oct 15, 1969Mar 21, 1972Gen Cable CorpPower cable with corrugated or smooth longitudinally folded metallic shielding tapeUS3651402Jan 27, 1969Mar 21, 1972Honeywell IncSupervisory apparatusUS3660721Feb 1, 1971May 2, 1972Gen ElectricProtective equipment for an alternating current power distribution systemUS3666876Jul 17, 1970May 30, 1972Exxon Research Engineering CoNovel compositions with controlled electrical propertiesUS3670192Oct 22, 1970Jun 13, 1972Asea AbRotating electrical machine with means for preventing discharge from coil endsUS3675056Jan 4, 1971Jul 4, 1972Gen ElectricHermetically sealed dynamoelectric machineUS3684821Mar 30, 1971Aug 15, 1972Sumitomo Electric IndustriesHigh voltage insulated electric cable having outer semiconductive layerUS3684906Mar 26, 1971Aug 15, 1972Gen ElectricCastable rotor having radially venting laminationsUS3699238Feb 29, 1972Oct 17, 1972Anaconda Wire & Cable CoFlexible power cableUS3716652Apr 18, 1972Feb 13, 1973G & W Electric Speciality CoSystem for dynamically cooling a high voltage cable terminationUS3716719Jun 7, 1971Feb 13, 1973Aerco CorpModulated output transformersUS3727085Sep 30, 1971Apr 10, 1973Gen Dynamics CorpElectric motor with facility for liquid coolingUS3740600Dec 12, 1971Jun 19, 1973Gen ElectricSelf-supporting coil braceUS3743867Dec 20, 1971Jul 3, 1973Massachusetts Inst TechnologyHigh voltage oil insulated and cooled armature windingsUS3746954Sep 17, 1971Jul 17, 1973Sqare D CoAdjustable voltage thyristor-controlled hoist control for a dc motorUS3758699Mar 15, 1972Sep 11, 1973G & W Electric Speciality CoApparatus and method for dynamically cooling a cable terminationUS3778891Oct 30, 1972Dec 18, 1973Westinghouse Electric CorpMethod of securing dynamoelectric machine coils by slot wedge and filler locking meansUS3781739Mar 28, 1973Dec 25, 1973Westinghouse Electric CorpInterleaved winding for electrical inductive apparatusUS3787607May 31, 1972Jan 22, 1974Teleprompter CorpCoaxial cable spliceUS3792399Aug 28, 1972Feb 12, 1974NasaBanded transformer coresUS3800362 *Oct 12, 1971Apr 2, 1974Hobart Mfg CoPatty machineUS3801843Jun 16, 1972Apr 2, 1974Gen ElectricRotating electrical machine having rotor and stator cooled by means of heat pipesUS3809933Aug 25, 1972May 7, 1974Hitachi LtdSupercooled rotor coil type electric machineUS3813764Jan 18, 1971Jun 4, 1974Res Inst Iron SteelMethod of producing laminated pancake type superconductive magnetsUS3820048Jun 1, 1973Jun 25, 1974Hitachi LtdShielded conductor for disk windings of inductive devicesUS3828115Jul 27, 1973Aug 6, 1974Kerite CoHigh voltage cable having high sic insulation layer between low sic insulation layers and terminal construction thereofUS3881647Apr 30, 1973May 6, 1975Lebus International IncAnti-slack line handling deviceUS3884154Dec 18, 1972May 20, 1975Siemens AgPropulsion arrangement equipped with a linear motorUS3891880May 18, 1973Jun 24, 1975Bbc Brown Boveri & CieHigh voltage winding with protection against glow dischargeUS3902000Nov 12, 1974Aug 26, 1975Us EnergyTermination for superconducting power transmission systemsUS3912957Dec 27, 1973Oct 14, 1975Gen ElectricDynamoelectric machine stator assembly with multi-barrel connection insulatorUS3932779Mar 5, 1974Jan 13, 1976Allmanna Svenska Elektriska AktiebolagetTurbo-generator rotor with a rotor winding and a method of securing the rotor windingUS3932791Feb 7, 1974Jan 13, 1976Oswald Joseph VMulti-range, high-speed A.C. over-current protection means including a static switchUS4364418 *Apr 6, 1979Dec 21, 1982CoflexipFlexible tubular conduitUS5430274 *Oct 7, 1994Jul 4, 1995CelesImprovements made to the cooling of coils of an induction heating systemUS5442131 *Jul 23, 1993Aug 15, 1995Borgwarth; DennisHigh energy coaxial cable cooling apparatusUS5461215 *Mar 17, 1994Oct 24, 1995Massachusetts Institute Of TechnologyFluid cooled litz coil inductive heater and connector thereforUS5591937 *Dec 2, 1994Jan 7, 1997Hughes Aircraft CompanyHigh power, high frequency transmission cable breach detection* Cited by examinerNon-Patent CitationsReference136-Kv. Generators Arise from Insulation Research; P. Sidler; Electrical World Oct. 15, 1932, ppp 524.2400-kV XLPE cable system passes CIGRE test; ABB Article; ABB Review Sep. 1995, pp 38.3A High Initial response Brushless Excitation System; T. L. Dillman et al; IEEE Power Generation Winter Meeting Proceedings, Jan. 31, 1971, pp 2089-2094.4A study of equipment sizes and constraints for a unified power flow controller; J Bian et al; IEEE 1996.5A Study of equipment sizes and constraints for a unified power flow controller; J. Bian et al; IEEE Transactions on Power Delivery, vol. 12, No. 3, Jul. 1997, pp. 1385-1391.6A test installation of a self-tuned ac filter in the Konti-Skan 2 HVDC link; T. Holmgren,G. Asplund, S. Valdemarsson, P. Hidman of ABB; U. Jonsson of Svenska Kraftnat; O. loof of Vattenfall Vastsverige AB; IEEE Stockholm Power Tech Conference Jun. 1995, pp 64-70.7ABB Elkrafthandbok; ABB AB; 1988 ; pp274-276.8Advanced Turbine-generators- an assessment; A. Appleton, et al; International Conf. Proceedings, Lg HV Elec. Sys. Paris, FR, Aug.-Sep. 1976, vol. I, Section 11-02, p. 1-9.9An EHV bulk Power transmission line Made with Low Loss XLPE Cable;Ichihara et al; Aug. 1992; pp3-6.10Analysis of faulted Power Systems; P Anderson, Iowa State University Press / Ames, Iowa, 1973, pp 255-257.11Application of high temperature superconductivy to electric motor design; J.S. Edmonds et al; IEEE Transactions on Energy Conversion Jun. 1992, No. 2, pp. 322-329.12Billig burk motar overtonen; A. Felldin; ERA (TEKNIK) Aug. 1994, pp 26-28.13Canadians Create Conductive Concrete; J. Beaudoin et al; Science, vol. 276, May 23, 1997, pp 1201.14Characteristics of a laser triggered spark gap using air, Ar, CH4,H2, He, N2, SF6 and Xe; W.D. Kimura et al; Journal of Applied Physics, Vol. 63, No. 6, Mar. 15, 1988, p. 1882-1888.15Cloth-transformer with divided windings and tension annealed amorphous wire; T. Yammamoto et al; IEEE Translation Journal on Magnetics in Japan vol. 4, No. 9 Sep. 1989.16Das Handbuch der Lokomotiven (hungarian locomotive V40 1 'D'); B. Hollingsworth et al; Pawlak Verlagsgesellschaft; 1933, pp. 254-255.17Der Asynchronmotor als Antrieb stopfbcichsloser Pumpen; E. Picmaus; Eletrotechnik und Maschinenbay No. 78, pp153-155, 1961.18Design and Construction of the 4 Tesla Background Coil for the Navy SMES Cable Test Apparatus; D.W.Scherbarth et al; IEEE Applied Superconductivity, vol. 7, No. 2, Jun. 1997, pp 840-843.19Design and manufacture of a large superconducting homopolar motor; A.D. Appleton; IEEE Transaction on Magnetics, vol. 19, No. 3, Part 2, May 1983, pp. 1048-1050.20Design Concepts for an Amorphous Metal Distribution Transformer; E. Boyd et al; IEEE Nov. 1984.21Design, manufacturing and cold test of a superconducting coil and its cryostat for SMES applications; A. Bautista et al; IEEE Applied Superconductivity, vol. 7, No. 2, Jun. 1997, pp 853-856.22Development of a Termination for the 77 kV-Class High Tc Superconducting Power Cable; T. Shimonosono et al; IEEE Power Delivery, vol. 12, No. 1, Jan. 1997, pp 33-38.23Develpment of extruded polymer insulated superconducting cable; Jan. 1992.24Die Wechselstromtechnik; A. Cour'Springer Vertag, Germany; 1936, pp. 586-598.25Direct Connection of Generators to HVDC Converters: Main Characteristics and Comparative Advantages; J.Arrillaga et al; Electra No. 149, Aug. 1993, pp 19-37.26Direct Generation of alternating current at high voltages; R. Parsons; IEEE Journal, vol. 67 #393, Jan. 15, 1929; pp1065-1080.27Eine neue Type von Unterwassermotoren; Electrotechnik und Maschinebam, 49; Aug. 1931; pp2-3.28Elektriska Maskiner; F. Gustavson; Institute for Elkreafteknilk, KTH; Stockholm, 1996, pp. 3-6 -3-12.29Elkraft teknisk Handbok, 2 Elmaskiner; A. Alfredsson et al; 1988, pp 121-123.30Elkrafthandbroken, Elmaskiner; A Rejminger; Elkrafthandbroken, Elmaskiner 1996, 15-20.31FREQSYN-a new drive system for high power applications;J-A. Bergman et al; ASEA Journal 59, Apr. 1986, pp16-19.32Fully slotless turbogenerators; E. Spooner; Proc., IEEE vol. 120 #12, Dec. 1973.33Fully Water-Cooled 190 MVA Generators in the Tonstad Hydroelectric Power Station; E. Ostby et al; BBC Review Aug. 1969, pp 380-385.34High capacity synchronous generator having no tooth stator; V.S. Kildishev et al; No. 1, 1977 pp11-16.35High Speed Synchronous Motors Adjustable Speed Drives; ASEA Generation Pamphlet OG 135-101 E, Jan. 1985, pp 1-4.36High Voltage Cables in a New Class of Generators Powerformer; M. Leijon et al; Jun. 14, 1999; pp1-8.37High Voltage Engineering; N.S. Naidu; High Voltage Engineering, second edition 1995 ISBN 0-07-462286-2, Chapter 5, pp. 91-98.38High Voltage Generators; G. Beschasinov et al; 1977; vol. 48. No. 6 pp1-7.39High-Voltage Stator Winding Development; D. Albright et al; Proj. Report EL339, Project 1716, Apr. 1984.40Hochspannungsaniagen for Wechselstrom; 97. Hochspannungsaufgaben an Generatoren und Motoren; Roth et al; 1938; pp452-455.41Hochspannungsanlagen for Wechselstrom; 97. Hochspannungsaufgaben an Generatoren und Motoren; Roth et al; Spring 1959, pp30-33.42Hochspannungstechnik; A. K�chler; Hochspannungstechnik, VDI Verlag 1996, pp. 365-366, ISBN 3-18-401530-0 or 3-540-62070-2.43Hydroalternators of 110 to 220 kV Elektrotechn. Obz., vol. 64, No. 3, pp132-136 Mar. 1975; A. Abramov.44Industrial High Voltage; F.H. Kreuger; Industrial High Voltage 1991 vol. 1, pp. 113-117.45In-Service Performance of HVDC Converter transformers and oil-cooled smoothing reactors; G.L. Desilets et al; Electra No. 155, Aug. 1994, pp 7-29.46Insulation systems for superconducting transmission cables; O. Toennesen; Nordic Insulation Symposium, Bergen, 1996, pp. 425-432.47International Electrotechnical Vocabulary, Chapter 551 Power Electronics; unknown author; International Electrotechnical Vocabulary Chapter 551: Power Electronics Bureau Central de la Commission Electrotechnique Internationale, Geneve; 1982, pp. 1-65.48Investigation and Use of Asynchronized Machines in Power Systems*; N.I.Blotskii et al; Elektrichestvo, No. 12, 1-6, 1985, pp 90-99.49J&P Transformer Book 11<SUP>th </SUP>Edition;A. C. Franklin et al; owned by Butterworth-Heinemann Ltd, Oxford Printed by Hartnolls Ltd in Great Britain 1983, pp29-67.50Las Einphasenwechselstromsystem hoherer Frequenz; J.G. Heft; Elektirsche Bahnen eb; Dec. 1987, pp. 388-389.51Lexikon der Technik; Luger; Band 2, Grundlagen der Elektrotechnik und Kerntechnik, 1960, pp. 395.52Low core loss rotating flux transformer; R. F. Krause, et al; American Institute Physics J.Appl.Phys vol. 64 #10 Nov. 1988, pp5376-5378.53Low-intensy laser-triggering of rail-gaps with magnesium-aerosol switching-gases; W. Frey; 11th International Pulse Power Conference, 1997, Baltimore, USA Digest of Technical Papers, p. 322-327.54Manufacture and Testing of Roebel bars; P. Marti et al.; 1960, Pub.86, vol. 8, pp 25-31.55MPTC: An economical alternative to universal power flow controllers; N. Mohan; EPE 1997, Trondheim, pp. 3.1027-3.1030.56Neue Lbsungswege zum Entwurf grosser Turbogeneratoren bis 2GVA, 60kV; G. Aicholzer; Sep. 1974, pp249-255.57Neue Wege zum Bau zweipoliger Turbogeneratoren bis 2 GVA, 6OkV Elektrotechnik und Maschinenbau Wien Janner 1972, Heft 1, Seite 1-11; G. Aichholzer.58Ohne Tranformator direkt ins Netz; Owman et al, ABB, AB; Feb. 8, 1999; pp48-51.59Oil Water cooled 300 MW turbine generator;L.P. Gnedin et al;Elektrotechnika , 1970, pp 6-8.60Optimizing designs of water-resistant magnet wire; V. Kuzenev et al; Elektrotekhnika, vol. 59, No. 12, pp35-40, 1988.61Our flexible friend article; M. Judge; New Scientist, May 10, 1997, pp 44-48.62Performance Characteristics of a Wide Range Induction Type Frequency Converter; G.A. Ghoneem; Ieema Journal, Sep. 1995, pp. 21-34.63Permanent Magnet Machines; K. Binns; 1987; pp 9-1 through 9-26.64Power Electronics and Variable Frequency Drives; B. Bimal; IEEE industrial Electronics-Technology and Applications, 1996, pp. 356.65Power Electronics -in Theory and Practice; K. Thorborg; ISBN 0-86238-341-2, 1993, pp. 1-13.66Power System Stability and Control; P. Kundur, 1994; pp23-25;p. 767.67Power Transmission by Direct Current; E. Uhlmann; ISBN 3-540-07122-9 Springer-Verlag, Berlin/Heidelberg/New York; 1975, pp. 327-328.68POWERFORMER (TM): A giant step in power plant engineering; Owman et al; CIGRE 1998, Paper 11:1.1.69Problems in design of the 110-5OokV high-voltage generators; Nikiti et al; World Electrotechnical Congress; Jun. 21-27, 1977; Section 1. Paper #18.70Properties of High Plymer Cement Mortar; M. Tamal et al; Science & Technology in Japan, No. 63; 1977, pp. 6-14.71Quench Protection and Stagnant Normal Zones in a Large Cryostable SMES; Y. Lvovsky et al; IEEE Applied Superconductivity, vol. 7, No. 2, Jun. 1997, pp 857-860.72Reactive Power Compensation; T. Petersson; 1993; pp 1-23.73Regulating transformers in power systems-new concepts and applications; E. Wirth et al; ABB Review Apr. 1999, p. 12-20.74Relocatable static var compensators help control unbundled power flows; R. C. Knight et al; Transmission & Distribution, Dec. 1996, pp 49-54.75Shipboard Electrical Insulation; G. L. Moses, 1951, pp2&3.76Six phase Synchronous Machine with AC and DC Stator Connections, Part 1: Equivalent circuit representation and Steady-State Analysis; R. Schiferi et al; Aug. 1983; pp2685-2693.77Six phase Synchronous Machine with AC and DC Stator Connections, Part II:Harmonic Studies and a proposed Uninterruptible Power Supply Scheme; R. Schiferi et al.;Aug. 1983 pp 2694-2701.78SMC Powders Open New Magnetic Applications; M. Persson (Editor); SMC Update, vol. 1, No. 1, Apr. 1997.79Stopfbachslose Umwalzpumpen- ein wichtiges Element im modernen Kraftwerkbau; H. Holz, KSB 1, pp13-19, 1960.80Submersible Motors and Wet-Rotor Motors for Centrifugal Pumps Submerged in the Fluid Handled; K.. Bienick, KSB; Feb. 25, 1988; pp9-17.81Synchronous machines with single or double 3-phase star-connected winding fed by 12-pulse load commutated inverter. Simulation of operational behaviour; C. Ivarson et al; ICEM 1994, International Conference on electrial machines, vol. 1, pp. 267-272.82Technik und Anwendung moderner Tauchpumpen; A. Heumann; 1987.83The Skagerrak transmission-the world's longest HVDC submarine cable link; L. Haglof et al of ASEA; ASEA Journal vol. 53, No. 1-2, 1980, pp 3-12.84Thin Type DC/DC Converter using a coreless wire transformer; K. Onda et al; Proc. IEEE Power Electronics Spec. Conf.; Jun. 1994, pp330-334.85Toroidal winding geometry for high voltage superconducting alternators; J. Kirtley et al; MIT-Elec. Power Sys. Engrg. Lab for IEEE PES;Feb. 1974.86Tranforming transfromers; S. Mehta et al; IEEE Spectrum,Jul. 1997, pp. 43-49.87Transformateurs a courant continu haute tension-examen des specifications; A. Lindroth et al; Electra No. 141, Apr. 1992, pp 34-39.88Transformer core losses; B. Richardson; Proc. IEEE May 1986, pp365-368.89Transformerboard; H.P. Moser et al; 1979, pp 1-19.90Underground Transmission Systems Reference Book; 1992;pp16-19; pp36-45; pp67-81.91Variable-speed switched reluctance motors; P.J. Lawrenson et al; IEE proc, vol. 127, Pt.B, No. 4, Jul. 1980, pp 253-265.92Verification of Limiter Performance in Modern Excitation Control Systems; G. K. Girgis et al; IEEE Energy Conservation, vol. 10, No. 3, Sep. 1995, pp 538-542.93Weatherbility of Polymer-Modified Mortars after Ten-Year Outdoor Exposure in Koriyama and Sapporo; Y. Ohama et al; Science & Technology in Japan No. 63; 1977, pp. 26-31.94Zur Entwicklung der Tauchpumpenmotoren; A. Schanz; KSB, pp19-24.95Zur Geschichte der Brown Boveri-Synchron-Maschinen; Vierzig Jahre Generatorbau; Jan.-Feb. 1931 pp15-39.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8062204 *Apr 22, 2005Nov 22, 2011Kanazawa UniversityCoil device and magnetic field generating device* Cited by examinerClassifications U.S. Classification174/15.1International ClassificationH01F27/28, H01F27/16, H01B9/06, H01F27/10Cooperative ClassificationH01F27/2876, H01F27/16European ClassificationH01F27/28F, H01F27/16Legal EventsDateCodeEventDescriptionOct 14, 2009FPAYFee paymentYear of fee payment: 4Aug 29, 2006CCCertificate of correctionApr 14, 2003ASAssignmentOwner name: ABB AB, SWEDENFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ARESKOUG, CLAES;REEL/FRAME:013958/0213Effective date: 20021009RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google