EP0956635A2 - Machine electrique tournante - Google Patents

Machine electrique tournante

Info

Publication number
EP0956635A2
EP0956635A2 EP98902363A EP98902363A EP0956635A2 EP 0956635 A2 EP0956635 A2 EP 0956635A2 EP 98902363 A EP98902363 A EP 98902363A EP 98902363 A EP98902363 A EP 98902363A EP 0956635 A2 EP0956635 A2 EP 0956635A2
Authority
EP
European Patent Office
Prior art keywords
electric machine
rotating electric
layer
layers
cables
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.)
Withdrawn
Application number
EP98902363A
Other languages
German (de)
English (en)
Inventor
Peter Carstensen
Mats Leijon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB AB
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
Priority claimed from SE9700355A external-priority patent/SE9700355D0/xx
Application filed by ABB AB filed Critical ABB AB
Publication of EP0956635A2 publication Critical patent/EP0956635A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • 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 present invention refers to rotating electric machines such as synchronous machines, as well as dual- fed machines, applications in asynchronous static cur- rent converter cascades, outerpole machines and synchronous flow machines.
  • the invention relates to such a machine according to the preamble of claim 1.
  • the machine is provided with a device for avoiding wear between conductors in the coil-end package of the stator in the machine.
  • the machine according to the invention is intended for use with high voltages, by which is meant electric voltages in excess of 10 kV.
  • a typical working range for the device according to the invention may be of 36 kV-800 kV.
  • a conductor is known through US-A 5,036,165, in which the insulation is provided with an inner and an outer layer of semiconducting pyrolized glassfiber. It is also known to provide conductors in a dynamo-electric machine with such an insulation, as described in US-A 5,066,881 for instance, where a semiconducting pyrolized glassfiber layer is in contact with the two pa- rallel rods forming the conductor, and the insulation in the stator slots is surrounded by an outer layer of semiconducting pyrolized glassfiber.
  • the pyrolized glassfiber material is described as suitable since it retains its resistivity even after the impregnation treatment.
  • the voltage of the machine can be increased to such levels that it can be connected directly to the power network without an intermediate transformer.
  • the conventional transformer can thus be eliminated.
  • the cables have a tendency to vibrate, causing the large coil-end packages to vibrate in relation to each other at frequencies double the network frequency, i.e. 100 Hz in a power network with a network frequency of 50 Hz, and 120 Hz in a power network with a nominal network frequency of 60 Hz, and at amp ⁇ litudes of approximately 0.1 mm.
  • the cables provided with an outer semiconducting layer by means of which their potential in relation to the surroundings shall be defined, are thus easily damaged due to wear against adjacent cables in the coil-end package.
  • the object of the present invention is to solve the above mentioned problem, and this is achieved by the machine described in the preamble of claim 1 being given the features specified in the characterizing portion of claim 1.
  • This solution means that the cables are secured relative eah other permitting a relative movement in which the cables are not rubbing against each other
  • the invention is in the first place intended for use with a high-voltage cable of the type built up of a core composed of a number of strand parts, a semiconduc- ting layer surrounding the core, an insulating layer surrounding the inner semiconducting layer, and an outer semiconducting layer surrounding the insulating layer, and its advantages are particularly prominent here.
  • the invention refers particularly to such a cab- le having a diameter within the interval 20-200 mm and a conducting area within the interval 80-3000 mm 2 . Such applications of the invention thus constitute preferred embodiments thereof.
  • the windings are preferably of a type corresponding to cables with solid, extruded insulation, such as those now used for power distribution, e.g. XLPE-cables or cables with EPR-insulation.
  • a cable comprises an inner conductor composed of one or more strand parts, an inner semiconducting 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 device 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 a XLPE- cable normally corresponds to a radius of curvature of approximately 20 cm for a cable 30 mm in diameter, and a radius of curvature of approximately 65 cm for a cable 80 mm in diameter.
  • 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 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 so- lid thermoplastic material such as low-density polyethylene (LDPE) , high-density polyethylene (HDPE) , polypropylene (PP) , polybutylene (PB) , polymethyl pentene (P P) , 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
  • P P polymethyl pentene
  • XLPE cross-linked polyethylene
  • 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, butyl graft polyethylene, ethylene-butyl-acrylate-copolymers and ethylene-ethyl-acrylate copolymers may also consti- tute suitable polymers for the semiconducting layers.
  • 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 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 large to enclose the electrical field in the cable, but sufficiently small 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 the winding, with these layers, will substantially enclose the electrical field within it.
  • Figure 1 shows a view in perspective of a part of the coil-end package at one end of the stator in an electric alternating current generator
  • Figure 2 shows a cross section through a cable of the type used in the stator winding
  • Figure 3 shows a cross section through a cable in the coil-end package incorporating a device accor- ding to the invention
  • Figure 4 shows the contact area between two cables in the coil-end package
  • Figure 5 shows the manufacture of a device according to the invention.
  • Figure 1 illustrates a section of the coil-end package in an alternating current generator. With its inner vertical surface 2, the stator 1 surrounds the rotor of the generator with an air gap. Cables 4 forming the winding protrude in an arc from one slot in the upper surface 3 of the stator 1 and enter another slot in the stator. These arcs of cables or coils form coil ends which come into contact with each other. One such contact point is designated 5 in Figure 1.
  • the arc-shaped coil ends become relatively loose and slippery and the vibration level reached by the cables during operation at a frequency of approximately 100 Hz causes relative movement between the cables in the contact area, a relative movement with an amplitude of approximately 0.1 mm. Such movement would cause damaging wear between the cables which in this case have no sheath.
  • FIG. 2 shows a cross section through a cable 4 which is used in conjunction with the present invention.
  • the cable 4 consists of a core 6 composed of a number of strand parts made of copper, for instance, and having circular cross section. This conductor 6 is arranged in the middle of the cable 4.
  • a first semiconducting layer 7 Around the conductor 6 is a first semiconducting layer 7.
  • an insulating layer 8 e.g. XLPE-insulation
  • a second semiconducting layer 9 e.g. XLPE-insulation
  • a cable does not include the outer protective sheath that normally surrounds a cable for power distribution.
  • the cable may be of the size specified in the introduction.
  • FIG 3 shows a cross section through such a cable, incorporating a device according to the invention.
  • the cables To avoid wear in the contact areas between the cables, the cables must be secured in relation to each other while permitting a relative movement that does not entail the cables rubbing against each other and thereby becoming worn.
  • the cables 4 are therefore provided with a sleeve 10 in the contacts.
  • the sleeve 10 consists of a helically shaped wound tape 11 (Fig. 4) .
  • the material in the sleeve 10 is not li- mited to any specific material but may be any type of material with a certain elasticity. Neither need the material be electrically insulating. It may be electrically conducting, although the former may be preferable in certain machine designs.
  • Figure 4 shows how the cables are secured to each other at the contact point 5 by means of a securing device in the form of a bundle binder 12. It is also advisable for the cables 4 to be similarly secured and clad in resilient material at outer fixed points in the stator as well.
  • Figure 5 shows a suitable method of producing the tape 11 which is to form the sleeve 10 on the cables.
  • a work piece 13 in the form of a tube or hose of material suitable for the purpose is slit along a helical line 14.
  • a helically shaped tape 11 is thus formed to produce the sleeve 10 to cover the cable 4 in the contact area 5. Contrary to a normal, straight tape wound aro- und the cable, the helically shaped tape is held in place by itself. No binder is therefore required, which would make the coil-end package thicker.
  • the layer in the sleeve 10 must be sufficiently thick to permit relative movement between the cables through shearing in the material, without slipping between the surfaces.
  • the thickness of the layer may vary between 0.5 and 5 mm depending on the cable diameter which may vary between 10 and 150 mm.
  • the device according to the invention prevents wear on the cables which would rapidly damage the outer semiconductor on the XLPE insulation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Frames (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Cette invention se rapporte à un dispositif servant à éviter l'usure entre les câbles dans le bloc terminal de bobines du stator 81) d'une machine électrique tournante, ce dispositif comprenant une couche élastique (10) placée dans la zone de contact (5) entre deux câbles (4). Cette couche (10) permet un certain degré de mouvement relatif entre les câbles (4) par l'intermédiaire du cisaillement s'exerçant dans le matériau élastique. Cette couche est formée par un manchon (10) dans lequel chaque câble (4) est introduit au niveau de la zone de contact (5). Ledit câble se compose d'un câble haute tension (4). Ledit manchon (10) est formé par une bande de forme hélicoïdale (11) d'un matériau électro-isolant ou électroconducteur.
EP98902363A 1997-02-03 1998-02-02 Machine electrique tournante Withdrawn EP0956635A2 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE9700355A SE9700355D0 (sv) 1997-02-03 1997-02-03 Anordning vid en roterande elektrisk maskin och maskin med en dylik anordning
SE9700355 1997-02-03
SE9704426A SE9704426D0 (sv) 1997-02-03 1997-11-28 Anordning vid en roterande elektrisk maskin och maskin med en dylik anordning
SE9704426 1997-11-28
PCT/SE1998/000166 WO1998034326A2 (fr) 1997-02-03 1998-02-02 Machine electrique tournante

Publications (1)

Publication Number Publication Date
EP0956635A2 true EP0956635A2 (fr) 1999-11-17

Family

ID=26662878

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98902363A Withdrawn EP0956635A2 (fr) 1997-02-03 1998-02-02 Machine electrique tournante

Country Status (10)

Country Link
EP (1) EP0956635A2 (fr)
JP (1) JP2001510013A (fr)
CN (1) CN1246979A (fr)
AU (1) AU5891798A (fr)
BR (1) BR9807152A (fr)
CA (1) CA2279413A1 (fr)
NZ (1) NZ337071A (fr)
PL (1) PL334862A1 (fr)
SE (1) SE9704426D0 (fr)
WO (1) WO1998034326A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE0202457D0 (sv) * 2002-08-19 2002-08-19 Alstom Switzerland Ltd Device and use at a stator of a high voltage generator
US11431312B2 (en) 2004-08-10 2022-08-30 Bongiovi Acoustics Llc System and method for digital signal processing
EP1791241A1 (fr) * 2005-11-24 2007-05-30 Siemens Aktiengesellschaft Dispositif avec barres de conducteurs pour un stator d'un générateur électrique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2885581A (en) * 1957-04-29 1959-05-05 Gen Electric Arrangement for preventing displacement of stator end turns
CA635218A (en) * 1958-01-02 1962-01-23 W. Smith John Reinforced end turns in dynamoelectric machines
US4367425A (en) * 1981-06-01 1983-01-04 Westinghouse Electric Corp. Impregnated high voltage spacers for use with resin filled hose bracing systems
US5036165A (en) * 1984-08-23 1991-07-30 General Electric Co. Semi-conducting layer for insulated electrical conductors
DE4233558C2 (de) * 1992-09-30 1995-07-20 Siemens Ag Elektrische Maschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9834326A3 *

Also Published As

Publication number Publication date
CN1246979A (zh) 2000-03-08
SE9704426D0 (sv) 1997-11-28
WO1998034326A3 (fr) 1998-10-22
WO1998034326A2 (fr) 1998-08-06
PL334862A1 (en) 2000-03-27
AU5891798A (en) 1998-08-25
CA2279413A1 (fr) 1998-08-06
NZ337071A (en) 2001-05-25
JP2001510013A (ja) 2001-07-24
BR9807152A (pt) 2000-04-25

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