Source: https://patents.google.com/patent/US6894416?oq=6%2C977%2C809
Timestamp: 2018-05-20 22:01:47
Document Index: 142833730

Matched Legal Cases: ['art 3', 'arts 7', 'arts 8', 'arts 7', 'arts 8', 'art 1']

US6894416B1 - Hydro-generator plant - Google Patents
Hydro-generator plant Download PDF
US6894416B1
US6894416B1 US08973018 US97301898A US6894416B1 US 6894416 B1 US6894416 B1 US 6894416B1 US 08973018 US08973018 US 08973018 US 97301898 A US97301898 A US 97301898A US 6894416 B1 US6894416 B1 US 6894416B1
US08973018
Bo Hernnäs
Mons Hölleland
Peter Templin
Erland Sörensen
Sören Berggren
Jan-Anders Nygren
Bengt Rydholm
Hans-Olof Kalldin
H01F2027/2833—Wires using coaxial cable as wire
Y10S174/22—Winding per se
Y10S174/29—High voltage cable, e.g. above 10kv, corona prevention having a semiconductive layer
The magnetic circuit of a generator in a hydro-generator plant is arranged to directly supply a high supply voltage of 20-800 kV, preferably higher than 36 kV. The generator is provided with solid insulation and its winding includes a cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by at least one outer and one inner semiconducting layer (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The stator winding may be produced with full or fractional slot winding, the phases of the winding being Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point may be earthed via a suppression filter. The invention also relates to a hydro-generator plant, a generator included in the plant and a procedure for building such a plant.
The present invention relates to a hydro-generator plant of the type described in the preamble to the claim and which is intended for connection to distribution or transmission networks, hereinafter called power networks. The invention also relates to an electric generator for high voltage in a hydro-generator plant intended for the above-mentioned purpose. The invention further relates to a procedure for assembling such a plant and the manufacture of such a generator.
The magnetic circuits in electric generators usually comprise a laminated core, e.g. of sheet steel with a welded construction. To provide ventilation and cooling the core is often divided into stacks with radial and/or axial ventilation ducts. For larger machines the laminations are punched out in segments which are attached to the frame of the machine, the laminated core being held together by pressure fingers and pressure rings. The winding of the magnetic circuit is disposed in slots in the core, the slots generally having a cross section in the shape of a rectangle or trapezium.
It is also generally known that connection of a synchronous machine to a power network must be via a Δ/Y-connected or step-up transformer, since the voltage of the power network is generally higher than the voltage it has hitherto been able to achieve with the electric machine. Thus this transformer and the synchronous machine constitute integrated parts of a plant. The transformer entails an extra cost and also has the drawback that the total efficiency of the system is reduced. If, therefore, it were possible to manufacture electric generators for considerably higher voltages, the step-up transformer could be eliminated.
Although the dominant known technology for supplying current from a generator to a high-voltage network, a concept which in the present application applies to the level of 20 kV and upwards, preferably higher than 36 kV, is for a transformer to be inserted between the generator and the power network, it is already known to attempt to eliminate the transformer and generate the high voltage directly out to the power network at its voltage level. Such generators are described, for instance, in U.S. Pat. Nos. 4,429,244, 4,164,672 and 3,743,867.
However, the machine designs according to the above publications do not permit optimal utilization of the electromagnetic material in the stator.
The object of the invention is thus to provide an electric generator which can be used in a hydro-generator plant for such high voltage that the above-mentioned Δ/Y-connected step-up transformer can be omitted, i.e. a plant in which the electric generators are intended for considerably high voltages than conventional machines of corresponding type, in order to be able to execute direct connection to power networks at all types of high voltage.
This object has been achieved according to the invention in that a plant of the type described in the preamble to claim 1 is given the special features defined in the characterizing part of this claim, in that a generator of the type described in the preamble to claim 34 is given the special features defined in the characterizing part of this claim, and in that a procedure of the type described in the preamble to claim 33 includes the special measures defined in the characterizing parts of respective claims.
Thanks to the solid insulation in combination with the other features defined, the network can be supplied without the use of an intermediate step-up transformer even at network voltages considerably in excess of 36 kV.
The fact that the solid insulation enables the windings to be arranged for direct connection to the high-voltage network, thus eliminating the step-up transformer, offers great advantages over known technology.
The elimination of the transformer per se entails great savings, for instance, and the absence of the transformer also results in several other simplifications and thus savings.
A plant of this type is often arranged in a rock chamber where, with conventional technology, the transformer is arranged either in direct connection with the generator in the rock chamber or above ground at a distance of several hundred meters and connected to the generator by a busbar system. Compared with the first alternative, elimination of the transformer enables the volume of the rock chamber to be greatly reduced. The fire risk entailed with an oil-insulated transformer is also eliminated therefore reducing the necessity for extensive fire-safety precautions such as special evacuation routes for personnel.
In the alternative in which the transformer is placed above ground the busbar system is more extended due to the longer distance between the generator and the transformer. Since the current in the busbars (normally with aluminium conductors) is considerable, in the order of 10-20 kA, the power losses are large. Moreover, busbar systems introduce a risk for 2- and 3-phase faults during which the currents are considerable.
With the present invention two major objectives are achieved:
The losses in the busrun are reduced due to the high voltage.
The risk for 2- and 3-phase failures is considerably reduced due to the use of insulated HV cables.
The reduction in the number of electrical components achieved with the invention therefore means that the corresponding safety equipment can be omitted.
Furthermore, the rock chamber need not be blasted to allow laying of the busbar system, which entails a saving in rock chamber space of several thousand cubic meters.
The plant according to the invention also enables several connections with different voltage levels to be arranged, i.e. the invention can be used for all auxiliary power in the power station.
In all, the advantages mentioned above entail radically improved total economy for the plant. The plant cost, typically in the order of some hundred million SEK, is reduced by 30-50%. Operating economy is improved both by less need for maintenance and by an increase in the degree of efficiency by 1-1.5%. For an operating time of 8000 h/year, an output level corresponding to 150 MVA, a kWh price of SEK 0.20 and a useful service life of 30 years the gain would be approximately SEK 75-100 million per generator.
In a particularly preferred embodiment of the plant and generator respectively, the solid insulation system comprises at least two layers, each layer constituting essentially an equipotential surface, and also intermediate solid insulation therebetween, at least one of the layers having substantially the same coefficient of thermal expansion as the solid insulation.
It should be evident that the windings and the insulating layers are flexible so that they can be bent.
It should also be pointed out that the plant according to the invention can be constructed using either horizontal or vertical generators, which may be of either underground or aboveground type.
The major and essential difference between known technology and the embodiment according to the invention is thus that this is achieved with a magnetic circuit included in an electric generator which is arranged to be directly connected via only breakers and isolators to a high supply voltage in the vicinity of between 20 and 800 kV, preferably higher than 36 kV. The magnetic circuit thus comprises a laminated core having at least one winding consisting of a threaded cable with one or more permanently insulated conductors having a semiconducting layer both at the conductor and outside the insulation, the outer semiconducting layer being connected to earth potential.
Such features mentioned above and other essential characteristics of the generator and thus of the hydro-generator plant according to the invention include the following:
The winding of the magnetic circuit is produced from a cable having one or more permanently insulated conductors with a semiconducting layer at both conductor and sheath. Some typical conductors of this type are PEX cable or a cable with EP rubber insulation which, however, for the present purpose are further developed both as regards the strands in the conductor and the nature of the outer sheath.
The cable for high voltage used in the magnetic circuit winding is constructed of an inner core/conductor with a plurality of strands, at least two semiconducting layers, the innermost being surrounded by an insulating layer, which is in turn surrounded by an outer semiconducting layer having an outer diameter in the order of 20-200 mm and a conductor area in the order of 40-3000 mm2.
The solid insulation in a generator according to the invention also offers great advantages when constructing a hydro-generator plant. The absence of wet insulation means that the stator of the generator need not be completed at the factory but can instead be delivered in parts and assembled on site. A stator of the size under consideration here is large and heavy which has entailed transport problems with conventional designs where the roads must be reinforced and dimensioned for the vast weight. This problem is eliminated since the stator for a generator can be delivered in parts.
The invention thus also relates to the procedures as defined in claims 30 and 33, where this possibility is exploited when building a hydro-generator plant and manufacturing a generator, respectively.
The invention will be described in more detail in the following detailed description of a preferred embodiment of constructing the magnetic circuit of the electric generator in the hydro-generator plant, with reference to the accompanying drawings in which
FIG. 1 shows a schematic axial end view of a sector of the stator in an electric generator in the hydro-generator plant according to the invention,
FIG. 2 shows an end view, partially stripped, of a cable used in the winding of the stator according to FIG. 1,
FIG. 3 shows a simplified view, partially in section, of a hydro-generator arrangement according to the invention,
FIG. 4 shows a circuit diagram for the hydro-generator plant according to the invention,
FIG. 5 shows a section through a conventional hydro-generator plant.
FIG. 6 is a diagram showing a traditional solution for auxiliary power for a hydro plant, and
FIG. 7 is a diagram showing generators with build-in windings for generation of auxiliary power according to the invention.
In order to understand certain aspects of the advantages of the invention, reference is made initially to FIG. 5 showing an example of a conventional hydro-generator plant. This is of a type with the transformer hall 501 situated some way from the generator hall 502, the latter being in the form of a rock chamber housing the generator 503. The generator 503 is connected to the transformer in the transformer hall 501 via a busbar system 505 arranged in a tunnel system 504 several hundred meters long. A plant according to the invention entirely eliminates the part to the right of the line A-A in FIG. 5, while substantially the same dimensions are retained in the generator hall 502. A conventional plant without the transformer situated above ground as shown in FIG. 5 would instead require a considerably larger generator hall 502 to allow space for the transformer and its auxiliary and safety equipment.
The rotor 2 of the generator is also indicated in the schematic axial view through a sector of the stator 1 according to FIG. 1, pertaining to the generator 100 (FIG. 3) included in the hydro-generator plant. The stator 1 is composed in conventional manner of a laminated core. FIG. 1 shows a sector of the generator corresponding to one pole pitch. From a yoke part 3 of the core situated radially outermost, a number of teeth 4 extend radially in towards the rotor 2 and are separated by slots 5 in which the stator winding is arranged. Cables 6 forming this stator winding, are high-voltage cables which may be of substantially the same type as those used for power distribution, i.e. PEX cables. PEX=crosslinked polyethylene (XLPE). One difference is that the outer, mechanically-protective sheath, and the metal screen normally surrounding such power distribution cables are eliminated so that the cable for the present application comprises only the conductor and at least one semiconducting layer on each side of an insulating layer. Thus, the semiconducting layer which is sensitive to mechanical damage lies naked on the surface of the cable.
The cables 6 are illustrated schematically in FIG. 1, only the conducting central part of each cable part or coil side being drawn in. As can be seen, each slot 5 has varying cross section with alternating wide parts 7 and narrow parts 8. The wide parts 7 are substantially circular and surround the cabling, the waist parts between these forming narrow parts 8. The waist parts serve to radially fix the position of each cable. The cross section of the slot 5 also narrows radially inwards. This is because the voltage on the cable parts is lower the closer to the radially inner part of the stator 1 they are situated. Slimmer cabling can therefore be used there, whereas coarser cabling is necessary further out. In the example illustrated cables of three different dimensions are used, arranged in three correspondingly dimensioned sections 51, 52, 53 of slots 5. An auxiliary power winding 9 is arranged furthest out in the slot 5.
FIG. 2 shows a step-wise stripped end view of a high-voltage cable for use in an electric machine according to the present invention. The high-voltage cable 6 comprises one or more conductors 31, each of which comprises a number of strands 36 which together give a circular cross section of copper (Cu), for instance. These conductors 31 are arranged in the middle of the high-voltage cable 6 and in the shown embodiment each is surrounded by a part insulation 35. However, it is feasible for the part insulation 35 to be omitted on one of the conductors 31. In the present embodiment of the invention the conductors 31 are together surrounded by a first semiconducting layer 32. Around this first semiconducting layer 32 is an insulating layer 33, e.g. PEX insulation, which is in turn surrounded by a second semiconducting layer 34. Thus the concept “high-voltage cable” in this application need not include any metallic screen or outer sheath of the type that normal surrounds such a cable for power distribution.
A hydro-generator with a magnetic circuit of the type described above is shown in FIG. 3 where the generator 100 is driven by a water turbine 102 via a common shaft 101.
The stator 1 of the generator 100 thus carries the stator windings 10 which are built up of the cable 6 described above. The cable 6 is unscreened and changes to a screened cable 11 at the cable splicing 9.
With a hydro-generator 100 according to the invention it is thus possible to generate extremely high electric voltages of up to approximately 800 kV. It is thus possible to electrically connect the hydro-generator 100 directly to a distribution or transmission network 110 with an intermediate step-up transformer or similar electric machine as is generally the case in conventional plants where equivalent generators are able at most to generate voltages of up of 25-30 kV.
FIG. 4 illustrates a hydro-generator plant according to the present invention. In conventional manner, the generator 100 has an excitation winding 112 and one (or more) auxiliary power winding(s) 113. In the shown embodiment of the plant according to the invention the generator 100 is earthed via an impedance 103.
It can also be seen from FIG. 4 that the generator 100 is electrically connected via the cable splicing 9 to the screened cable 11 (see also FIG. 3). The cable 11 is provided with current transformers 104 in conventional manner, and terminates at 105. After this point 105 the electric plant in the shown embodiment continues with busbars 106 having branches with voltage transformers 107 and surge arresters 108. However, the main electric supply takes place via the busbars 106 directly to the distribution or transmission network 110 via isolator 109 and circuit-breaker 111.
A hydro-generator plant according to the invention is designed for operation either to generate electric voltage for the power network as described above, or as a pump plant, i.e. to be driven from the electric power network 110. The generator 100 then operates as a motor to drive the turbine 102 as a pump.
Thus, with the hydro-generator 100, no intermediate coupling of a step-up transformer is required. With the hydro-generator plant according to the present invention, therefore, several transformer and breaker units previously necessary are eliminated, which is obviously an advantage—not least from the aspects of cost and operating reliability.
Although the hydro-generator and the plant in which this generator is included have been described and illustrated in connection with an embodiment by way of example, it should be obvious to one skilled in that art that several modifications are possible without departing from the inventive concept. The generator may be earthed directly, for instance, without any impedance. The auxiliary windings can be omitted, as also other components shown. Although the invention has been exemplified with a three-phase plant, the number of phases may be more or less.
1. A hydrogenerator plant for connection to a high voltage transmission or distribution network comprising: at least one rotating electric machine for high voltage coupled to a turbine via shaft means, said electric machine comprising at least one winding formed of a conductor including a plurality of insulated conductive elements, and at least one uninsulated conductive element; a covering surrounding the conductor including an inner layer having semiconducting properties, a solid insulating layer surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulating layer, said inner layer being in contact with the uninsulated element such that the inner layer has the same potential as the conductor, and said at least one winding being directly connectable to the transmission or distribution network, the voltages being across a range of transmission or distribution voltages.
2. The plant as claimed in claim 1 wherein the at least two semiconducting layers each form essentially an equipotential surface, and wherein at least one of the layers has substantially the same coefficient of thermal expansion as the solid insulation.
3. The plant as claimed in claim 1, wherein the generator comprises a magnetic circuit with a magnetic core.
4. The plant as claimed in claim 3, wherein the electric machine includes a core comprising laminated sheet of at least one of cast iron, powder-based iron, and rough forge iron.
5. The plant as claimed in claim 1 wherein the winding comprises a cable.
6. The plant as claimed in claim 5, wherein at least two of said layers have substantially the same coefficient of thermal expansion.
7. The plant as claimed in claim 1, wherein the inner semiconducting layer is at substantially the same potential as the conductors.
8. The plant as claimed in claim 1, wherein the outer semiconducting layer forms an equipotential surface surrounding the conductors.
9. The plant as claimed in claim 8, wherein said outer semiconducting layer is connected to a predefined potential.
10. The plant as claimed in claim 9, wherein the predefined potential is earth potential.
11. A plant as claimed in claim 9 wherein the coils in the stator are distributed and have a coil span different from the pole pitch.
12. The plant as claimed in claim 1, wherein the cable also comprises a metal screen and a sheath.
13. The plant as claimed in claim 1 including a stator cooled at earth potential by means of a fluid.
14. The plant as claimed in claim 1 wherein the outer semiconducting layer is connected to earth potential.
15. The plant as claimed in claim 1, wherein the electric machine includes a rotor inductively connected to the high voltage.
16. The plant as claimed in claim 15, wherein the rotor is cylindrical in shape, has salient poles and also has a constant air gap.
17. The plant as claimed in claim 16, wherein the electric machine includes a stator having a stator winding formed as at least one of an integral slot winding, and a fractional slot winding.
18. The plant as claimed in claim 17, wherein the stator has a pole pitch and the winding is distributed and includes a coil having a coil span different from the pole pitch.
19. The plant as claimed in claim 1, wherein the cable has a conductor area of about between 40 and 3000 mm2 and an outer cable diameter of about between 20 and 250 mm.
20. The plant as claimed in claim 19, wherein the cable is cooled by gas or liquid inside current-carrying conductors.
21. The plant as claimed in claim 1, wherein the electric machine is designed for high voltage and arranged to supply the out-going electric network directly without any intermediate connection of a transformer.
22. The plant as claimed in claim 21, wherein at least one electric machine is earthed via an impedance.
23. The plant as claimed in claim 21, wherein electric machine is directly earthed.
24. The plant as claimed in claim 21, wherein said plant is operative as at least one of a pump and turbine station, the electric machine being arranged to function as at least one of a motor driven directly from the transmission or distribution network and as a generator, generating voltage for the transmission or distribution network.
25. The plant as claimed claim 21, wherein the electric machine is arranged to generate power to various voltage levels.
26. The plant as claimed in claim 25, wherein at least one electric machine includes a separate auxiliary winding for producing auxiliary power at one of said voltage levels.
27. The plant as claimed in claim 1, comprising a plurality of electric machines, each of which lacks an individual step-up transformer, but which, via a system transformer common to the electric machines, is connected to the transmission or distribution network.
28. The plant as claimed in claim 1, including a common earth system.
29. The plant as claimed in claim 1, wherein the winding of the electric machine is operable for self-regulating field control and lacks auxiliary means for control of the field.
30. The plant as claimed in claim 1, wherein the electric machine includes a stator comprising a plurality of stator limitations having openings for receiving the winding, said laminations being assembled into a stack with the openings aligned, and the winding comprises a cable threaded into the openings or the stacking laminations of the stator at the manufacturing facility or at the generation plant site.
31. An electric generator for a high voltage included in a hydro-generator plant in which the generator is coupled to a turbine via shaft means, said generator comprising at least one winding including a conductor, a solid insulation covering including an inner layer having semiconducting properties; a solid insulating layer surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulation layer; said conductor formed of a plurality of conductive elements including at least one uninsulated element in contact with the inner layer and a plurality of insulated elements; and wherein each winding is directly connectable to a high voltage transmission or distribution network, and the inner layer forms an equipotential surface about the conductor.
32. A hydrogenerator plant including a rotating high voltage electric machine comprising a stator; a rotor and a winding, wherein said winding comprises a cable including a current-carrying conductor and a magnetically permeable, electric field confining cover surrounding the conductor, the cover including an inner layer having semiconducting properties, a solid insulation surrounding the inner layer and an outer layer having semiconducting properties surrounding the solid insulation, said cable forming at least one uninterrupted turn in the corresponding winding of said machine, and wherein the conductor includes a plurality of insulated conductive strands and at least one uninsulated electrically conductive strand in contact with the inner layer, such that said conductor and inner layer are at the same potential.
33. The hydrogenerator plant of claim 32, wherein the outer layer has a conductivity sufficient to establish an equipotential surface around the conductor.
34. The hydrogenerator plant of claim 32, wherein the cover is formed of a plurality of integrally bonded layers, and wherein said plurality of layers are substantially void free.
35. A hydrogenerator plant for direct connection to a high voltage transmission or distribution network comprising: at least one rotating electric machine for high voltage coupled to a turbine via shaft means, said electric machine including at least one winding comprising a conductor and a magnetically permeable, electric field confining insulating covering surrounding the conductor including an inner layer having semiconducting properties, a solid insulation surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulating layer, said conductor including at least one of a plurality of insulated conductive elements, and at least one uninsulated conductive element being in contact with the inner layer such that said conductor and inner layer are at the same potential; and said at least one winding being directly connectable to the transmission or distribution network.
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