WO1999017424A1 - Machine electrique tournante a circuit magnetique - Google Patents

Machine electrique tournante a circuit magnetique Download PDF

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Publication number
WO1999017424A1
WO1999017424A1 PCT/SE1998/001735 SE9801735W WO9917424A1 WO 1999017424 A1 WO1999017424 A1 WO 1999017424A1 SE 9801735 W SE9801735 W SE 9801735W WO 9917424 A1 WO9917424 A1 WO 9917424A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
machine
rotor
cable
supported
Prior art date
Application number
PCT/SE1998/001735
Other languages
English (en)
Inventor
Bengt Rothman
Original Assignee
Abb Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Abb Ab filed Critical Abb Ab
Priority to CA002305417A priority Critical patent/CA2305417A1/fr
Priority to AU93706/98A priority patent/AU736226B2/en
Priority to EP98946757A priority patent/EP1020002A1/fr
Priority to JP2000514376A priority patent/JP2001518774A/ja
Priority to BR9812403-0A priority patent/BR9812403A/pt
Publication of WO1999017424A1 publication Critical patent/WO1999017424A1/fr
Priority to NO20001317A priority patent/NO20001317L/no

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/22—Synchronous generators having windings each turn of which co-operates alternately with poles of opposite polarity, e.g. heteropolar generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/102—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction brakes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/15—Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables

Definitions

  • the rotating electric machines referred to herein comprise synchronous machines used primarily as generators for connection to distri- bution and transmission networks, in the following referred to as power networks.
  • the synchronous machines are also used as motors as well as for phase compensation and voltage control and in that case as mechanically open-circuited machines.
  • the technical field also includes dual-fed machines, asynchronous static current converter cascades, outerpole ma- chines and synchronous flow machines. These machines are intended for use with high voltages. High voltages shall be understood here to mean electric voltages in excess of 10 kV.
  • a typical operating range for the machine according to the invention may be 36 to 800 kV.
  • the need for fast, continuously adjustable reac- tive power is thus satisfied, connected directly to subtransmission or transmission level in order to deal with system stability and/or the dependence of rotating mass and e.m.f. in the vicinity of high-voltage direct current transmissions or, alternatively, to generate or consume high-voltage alternating current connected directly to subtransmission or transmission level.
  • the station may be for a few MVA up to thousands of MVA.
  • transformers in which the reactance consumes reactive power are unnecessary, as are also traditional high- power circuit breakers.
  • Advantages are also gained with regard to network quality since rotating compensation is obtained, and with regard to overload capacity which may be +100% in such machines.
  • the control range may be +100% for reactive power.
  • stator winding in such a high-voltage machine acquires considerable radial dimension.
  • the diameter increases in proportion to the number of turns of the winding and the slots in the stator laminations carrying the cable must be deep and the stator laminations numerous.
  • the object of the present invention is to solve the above- mentioned problems and provide a machine with a smaller stator and thus an arrangement which is smaller in dimension but not in power. This object is achieved by the machine according to the invention being given the characteristics defined in the claims.
  • Figure 1 shows a cross section through a cable used in the invention
  • Figure 2 shows an axial section through a machine according to the invention, designed as a hydroelectric generator
  • Figure 3 likewise shows an axial section through a second embodiment of the machine according to the invention
  • Figure 4 likewise shows an axial section through a third embodiment of the invention according to the invention
  • Figure 5 likewise shows an axial section through a fourth embodiment of the invention according to the invention.
  • the invention is in the first place intended for use with a high- voltage cable 1 of the type (Fig. 1) built up of a core having a plurality of strand parts 2, an insulating layer 4 surrounding the inner semiconducting layer, and an outer semiconducting layer 5, and its advantages are particularly pronounced here.
  • the invention refers particularly to such a cable having a diameter within the interval 20-200 mm and a conducting area within the interval 80-3000 mm 2 .
  • the cable therefore does not include the outer sheath that normally surrounds a cable for power distribution.
  • the insulated conductor or high-voltage cable used in the present invention is flexible and is of the type described in more detail in WO 97/45919 and WO 97/45847.
  • the insulated conductor or cable is described further in WO 97/45918, WO 97/45930 and WO 97/45931.
  • the windings are preferably of a type corresponding to cables having solid, extruded insulation, of a type now used for power distribution, such as XLPE-cables or cables with EPR-insulation.
  • a cable comprises an inner conductor composed of one or more strand parts, an inner semicon- ducting layer surrounding the conductor, a solid insulating layer surrounding this and an outer semiconducting layer surrounding the insulating layer.
  • Such cables are flexible, which is an important property in this context since the technology for the arrangement according to the invention is based primarily on winding systems in which the winding is formed from cable which is bent during assembly.
  • the flexibility of an XLPE-cable normally corresponds to a radius of curvature of approximately 20 cm for a cable with a diameter of 30 mm, and a radius of curvature of approximately 65 cm for a cable with a diameter of 80 mm.
  • the term "flexible" is used to indicate that the winding is flexible down to a radius of curvature in the order of four times the cable diameter, preferably eight to twelve times the cable diameter.
  • the winding should be constructed to retain its properties even when it is bent and when it is subjected to thermal or mechanical stress during operation. It is vital that the layers retain their adhesion to each other in this context.
  • the material properties of the layers are decisive here, particularly their elasticity and relative coefficients of thermal expansion.
  • the insulating layer consists of cross- linked, low-density polyethylene
  • the semiconducting layers consist of polyethylene with soot and metal particles mixed in.
  • the insulating layer may consist, for example, of a solid thermoplastic material such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polybutylene (PB), polymethyl pentene (“TPX”), cross-linked materials such as cross-linked polyethylene (XLPE), or rubber such as ethylene propylene rubber (EPR) or silicon rubber.
  • LDPE low-density polyethylene
  • HDPE high-density polyethylene
  • PP polypropylene
  • PB polybutylene
  • TPX polymethyl pentene
  • XLPE cross-linked materials
  • EPR ethylene propylene rubber
  • the inner and outer semiconducting layers may be of the same basic material but with particles of conducting material such as soot or metal powder mixed in.
  • the mechanical properties of these materials are affected relatively little by whether soot or metal powder is mixed in or not - at least in the proportions required to achieve the conductivity necessary according to the invention.
  • the insulating layer and the semiconducting layers thus have substantially the same coefficients of thermal expansion.
  • Ethylene-vinyl-acetate copolymers/nitrile rubber EVA/NBR
  • butyl graft polyethylene EBA
  • EBA ethylene-butyl-acrylate copolymers
  • EAA ethyl- ene-ethyl-acrylate copolymers
  • E-modulus of E ⁇ 500 MPa preferably ⁇ 200 MPa.
  • the elasticity is sufficient for any minor differences between the coefficients of thermal expansion for the materials in the layers to be absorbed in the radial direction of the elasticity so that no cracks appear, or any other damage, and so that the layers are not released from each other.
  • the material in the layers is elastic, and the adhesion between the layers is at least of the same magnitude as in the weakest of the materials.
  • the conductivity of the two semiconducting layers is sufficient to substantially equalize the potential along each layer.
  • the conductivity of the outer semiconducting layer is sufficiently high to enclose the electrical field within the cable, but sufficiently low not to give rise to significant losses due to currents induced in the longitudinal direction of the layer.
  • each of the two semiconducting layers essentially constitutes one equipotential surface, and these layers will substantially enclose the electrical field between them. There is, of course, nothing to prevent one or more additional semiconducting layers being arranged in the insulating layer.
  • Figure 1 illustrating the insulated conductor or cable, the three layers are executed so that they adhere to each other even when the ca- ble is bent.
  • the cable shown is flexible and this property is retained throughout the life of the cable.
  • FIG. 2 shows in axial section a first embodiment of a rotating high-voltage machine according to the invention, in this case in the form of a hydroelectric generator.
  • the rotor spokes 8 are attached on the turbine shaft 6 which, in this case, is journalled in a single guide bearing 7. These spokes support the rotor 9 with its excitation winding 10.
  • the stator 11 is supported from below on a fixed foundation 12, and coil ends 14 of the stator winding 13 protrude from the stator 11.
  • stator and rotor have exchanged places on each side of the air gap 15.
  • slot depth 16 for the stator winding 13 will be smaller, and also the number of stator laminations will be fewer for a given air gap diameter 17.
  • the poles 21 on the rotor are pronounced and since they are placed on the inside of the rotor 9, against the stator 11 , the rotor ring can be run at high speed without risk of problems with regard to its strength as may otherwise be the case in the higher speed register.
  • Figures 3-5 show three other embodiments of the machine according to the invention, designed as a hydroelectric generator. These figures reveal various ways of utilizing the generator pit 22 with varying degrees of success.
  • Figure 3 shows the stator 11 suspended from the fixed beam 19, while the rotor 9 is supported by spokes 8 arranged below the stator. In this case, however, two guide bearings 7 and 20 are required for the shaft 6.
  • Figure 4 shows a embodiment of the machine in which, as in Figure 3, the rotor spokes 8 are arranged below the stator 11.
  • the generator pit 22 is utilized better and the total height is less since the spokes 8 are inclined slightly upwards.
  • two guide bearings 7 and 20 are still required.
  • Figure 5 shows an even more compressed embodiment with the spokes 8 still further inclined. The machine has thus been compressed to such an extent that one guide bearing 7 is sufficient.
  • the rotor 9 and stator 11 may be so dimensioned that at nominal voltage, nominal power factor and over-excited operation, the thermally based stator and rotor current limits are exceeded approximately simultaneously. However, they may also be dimensioned so that at nominal volt- age, nominal power factor and over-excited operation, the thermally based stator limit is exceeded before the thermally based rotor current limit is exceeded.
  • the machine preferably has 100% overload capacity for two hours.
  • the synchronous reactance in transverse direction is suitably considerably less than the synchronous reactance in direct direction.
  • the machine is suitably equipped with excitation systems enabling negative and positive excitation.
  • the stator-winding phases in the machine are preferably Y- connected.
  • the Y-point of the stator winding can then be insulated and protected from over-voltages by surge diverters.
  • the Y-point of the stator winding may be earthed with the aid of a third-harmonic filter, i.e. a suppression filter between Y-point and earth.
  • the suppression filter may be so designed that it greatly reduces or even eliminates third- harmonic currents through thfe machine, while at the same time being di- mensioned so that voltages and currents are limited in the event of faults in the system.
  • the third-harmonic filter may be protected against over- voltages by surge diverters connected in parallel with the third-harmonic filter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

L'invention concerne une machine électrique tournante comprenant un circuit magnétique pour haute tension. La machine comprend un stator (11) dont l'enroulement comprend un câble (1) haute tension, et un rotor (9) entourant le stator (11).
PCT/SE1998/001735 1997-09-30 1998-09-29 Machine electrique tournante a circuit magnetique WO1999017424A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CA002305417A CA2305417A1 (fr) 1997-09-30 1998-09-29 Machine electrique tournante a circuit magnetique
AU93706/98A AU736226B2 (en) 1997-09-30 1998-09-29 Rotating electric machine with magnetic circuit
EP98946757A EP1020002A1 (fr) 1997-09-30 1998-09-29 Machine electrique tournante a circuit magnetique
JP2000514376A JP2001518774A (ja) 1997-09-30 1998-09-29 磁気回路付き回転電気機械
BR9812403-0A BR9812403A (pt) 1997-09-30 1998-09-29 Máquina elétrica rotativa com circuito magnético
NO20001317A NO20001317L (no) 1997-09-30 2000-03-14 Roterende elektrisk maskin med magnetisk krets

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9703549-7 1997-09-30
SE9703549A SE513385C2 (sv) 1997-09-30 1997-09-30 Roterande elektrisk maskin där statorlindningen utgörs av en högspänningskabel

Publications (1)

Publication Number Publication Date
WO1999017424A1 true WO1999017424A1 (fr) 1999-04-08

Family

ID=20408445

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/001735 WO1999017424A1 (fr) 1997-09-30 1998-09-29 Machine electrique tournante a circuit magnetique

Country Status (10)

Country Link
EP (1) EP1020002A1 (fr)
JP (1) JP2001518774A (fr)
CN (1) CN1272238A (fr)
AR (1) AR017274A1 (fr)
AU (1) AU736226B2 (fr)
CA (1) CA2305417A1 (fr)
NO (1) NO20001317L (fr)
PL (1) PL339557A1 (fr)
SE (1) SE513385C2 (fr)
WO (1) WO1999017424A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020191731A (ja) * 2019-05-22 2020-11-26 日新電機株式会社 高調波フィルタ装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258280A (en) * 1975-11-07 1981-03-24 Bbc Brown Boveri & Company Limited Supporting structure for slow speed large diameter electrical machines
US4475075A (en) * 1981-10-14 1984-10-02 Munn Robert B Electric power generator and system
US4677328A (en) * 1984-11-08 1987-06-30 Rikichi Kumakura Generator for use on bicycle
US4785138A (en) * 1985-12-06 1988-11-15 Kabel Electro Gesellschaft mit beschrankter Haftung Electric cable for use as phase winding for linear motors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5036165A (en) * 1984-08-23 1991-07-30 General Electric Co. Semi-conducting layer for insulated electrical conductors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258280A (en) * 1975-11-07 1981-03-24 Bbc Brown Boveri & Company Limited Supporting structure for slow speed large diameter electrical machines
US4475075A (en) * 1981-10-14 1984-10-02 Munn Robert B Electric power generator and system
US4677328A (en) * 1984-11-08 1987-06-30 Rikichi Kumakura Generator for use on bicycle
US4785138A (en) * 1985-12-06 1988-11-15 Kabel Electro Gesellschaft mit beschrankter Haftung Electric cable for use as phase winding for linear motors

Also Published As

Publication number Publication date
CA2305417A1 (fr) 1999-04-08
AR017274A1 (es) 2001-09-05
JP2001518774A (ja) 2001-10-16
SE9703549L (sv) 1999-03-31
PL339557A1 (en) 2000-12-18
NO20001317D0 (no) 2000-03-14
AU736226B2 (en) 2001-07-26
SE513385C2 (sv) 2000-09-04
SE9703549D0 (sv) 1997-09-30
EP1020002A1 (fr) 2000-07-19
AU9370698A (en) 1999-04-23
CN1272238A (zh) 2000-11-01
NO20001317L (no) 2000-03-14

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