Three-phase turbine generator stator double-outlet structure and generator device

Abstract

The application provides a three-phase turbo-generator stator double-outline structure and a turbo-generator device, and relates to the technical field of turbo-generators. The structure comprises a stator, a first winding arranged on the stator, and an excitation end and a steam end located at opposite ends of the stator. The first winding comprises a first sub-winding and a second sub-winding, and the first sub-winding and the second sub-winding each comprise a plurality of first coils connected in sequence in a head-to-tail manner. The first sub-winding is led out through the excitation end, the second sub-winding is led out through the steam end, and the electric signal transmission direction of the first coils in the first sub-winding and the electric signal transmission direction of the first coils in the second sub-winding are the same. It can be seen that the double-outline structure is a double-end outline structure with the excitation end and the steam end as the two ends, and the current of the stator is led out through the excitation end and the steam end, so that the current of each outline end can be greatly reduced, the electric power of the generator can be effectively reduced, the magnetic leakage field and the electrical loss can be reduced, and a series of problems caused by the large current of the stator can be eliminated.

Description

Technical Field

[0001] This application relates to the field of steam turbine generator technology, and in particular to a three-phase steam turbine generator stator double-outlet structure and generator equipment. Background Technology

[0002] With the continuous development of steam turbine generator technology, generator capacity is increasing daily, especially for ultra-large capacity generators, where stator current is showing a sharp upward trend, which can lead to a series of serious problems. For example, there are mechanical fixing challenges: large currents generate strong electrodynamic forces, posing a significant challenge to the mechanical fixing of stator ring leads, transition leads, and outgoing lines. This makes it difficult to effectively guarantee the stability of the leads and outgoing lines, easily leading to loosening, displacement, and other problems, thus affecting the normal operation of the generator. There is also the risk of overheating: large currents generate a large leakage magnetic field. Under the continuous action of the leakage magnetic field, heat is generated due to induced current, leading to the risk of overheating. Overheating not only reduces the performance and service life of components but may also cause safety accidents, posing a serious threat to the safe operation of the generator. Finally, there are cooling difficulties: large currents cause a significant increase in the electrical losses of copper conductors, causing the temperature of the ring leads, transition leads, and outgoing lines to rise. Existing cooling systems are unable to effectively meet the cooling requirements of this high-heat situation caused by large currents, thus affecting the overall performance and reliability of the generator. Summary of the Invention

[0003] In view of this, this application provides a three-phase steam turbine generator stator double-outlet structure and steam turbine generator equipment. Specifically, the steam turbine generator performance is optimized through the stator double-outlet structure, as follows:

[0004] A three-phase steam turbine generator stator double-outlet structure includes a stator and a first winding disposed on the stator, as well as a steam end and an excitation end located at opposite ends of the stator along the axial direction of the stator;

[0005] The first winding includes a first sub-winding and a second sub-winding. The first sub-winding includes a plurality of first coils connected end to end in sequence, and the second sub-winding includes a plurality of first coils connected end to end in sequence.

[0006] The first sub-winding is led out through the excitation end, and the second sub-winding is led out through the steam end. The electrical signal transmission direction of the first coil in the first sub-winding is the same as that of the first coil in the second sub-winding.

[0007] Optionally, both the first sub-winding and the second sub-winding include a first end and a second end, a plurality of first coils of the first sub-winding are located between the first end and the second end, a plurality of first coils of the second sub-winding are located between the first end and the second end, and the first end and the second end of the first sub-winding are led out through the excitation end, and the first end and the second end of the second sub-winding are led out through the steam end;

[0008] The electrical signal transmitted by the first sub-winding is input through the first terminal and output through the second terminal; the electrical signal transmitted by the second sub-winding is input through the second terminal and output through the first terminal.

[0009] Optionally, the first sub-winding includes M first coils connected end to end in sequence, and the second sub-winding includes N first coils connected end to end in sequence, where M and N are integers greater than or equal to 1.

[0010] The first coils of both the first sub-winding and the second sub-winding include a first wire bar and a second wire bar arranged opposite to each other. The first end of the first sub-winding is connected to the first wire bar of the first first coil, and the second end of the first sub-winding is connected to the second wire bar of the Mth first coil. The first end of the second sub-winding is connected to the first wire bar of the first first coil, and the second end of the second sub-winding is connected to the first wire bar of the Nth first coil.

[0011] Optionally, the turbine generator stator double-outlet structure further includes a first outlet box and a second outlet box. The first outlet box is disposed at the excitation end, and the second outlet box is disposed at the steam end. The first sub-winding is led out through the first outlet box, and the second sub-winding is led out through the second outlet box.

[0012] The first terminal box is provided with a first neutral terminal and a first outgoing terminal, and the first end and the second end of the first sub-winding are respectively connected to the first outgoing terminal and the first neutral terminal;

[0013] The second terminal box is provided with a second neutral terminal and a second outgoing terminal, and the first end and the second end of the second sub-winding are respectively connected to the first neutral terminal and the second outgoing terminal.

[0014] Optionally, the steam turbine generator further includes an output terminal and a neutral point terminal;

[0015] Both the first and second outgoing terminals are connected to the outgoing terminal, and both the first and second neutral terminals are connected to the neutral point terminal.

[0016] Optionally, the first winding includes Q first coils, and the first winding includes x first sub-windings and y second sub-windings, where Q is an integer greater than or equal to 2, and x and y are integers greater than or equal to 1.

[0017] The first sub-winding includes M first coils connected end to end in sequence, and the second sub-winding includes N first coils connected end to end in sequence, where Q is an integer greater than or equal to 2, and M and N are integers greater than or equal to 1.

[0018] Where x×M+y×N=Q, and M=N, x=y.

[0019] Optionally, the turbine generator stator double-outlet structure includes a first type of winding, a second type of winding, and a third type of winding;

[0020] At least one of the first type of winding, the second type of winding, and the third type of winding includes the first winding, and the rest include the second winding. The second winding includes a plurality of second coils connected end to end in sequence, and the second coils are led out through the excitation end or the steam end.

[0021] Optionally, the first type of winding, the second type of winding, and the third type of winding all include the first type of winding.

[0022] Optionally, the stator includes a stator core and electrical shielding rings located at both ends of the stator core along the axial direction. The steam end and the excitation end are located at opposite ends of the stator core along the axial direction. The first sub-winding is led out sequentially through the electrical shielding ring and the excitation end, and the second sub-winding is led out sequentially through the electrical shielding ring and the steam end.

[0023] The stator core has stepped end structures at both ends along its axial direction, and the radius of the end structure is larger the closer it is to the end of the stator core.

[0024] The number of steps in the end structures at both ends of the stator core along its axial direction may be the same or different.

[0025] A steam turbine generator set includes the three-phase steam turbine generator stator double-outlet structure described in any of the above claims.

[0026] Compared with related technologies, the beneficial effects of the technical solution in this application are as follows:

[0027] The turbine generator stator dual-outlet structure includes a stator, a first winding mounted on the stator, and excitation and steam ends located at opposite ends of the stator. The first winding includes a first sub-winding and a second sub-winding, each comprising multiple first coils connected end-to-end in sequence. The first sub-winding is led out from the excitation end, and the second sub-winding is led out from the steam end. The direction of electrical signal transmission for the first coils in the first sub-winding is the same as the direction of electrical signal transmission for the first coils in the second sub-winding. Therefore, this turbine generator stator dual-outlet structure is a dual-outlet structure with lines leading from both the excitation and steam ends. The stator current is led out from both the excitation and steam ends, which can significantly reduce the current at each outlet, effectively reducing the generator's electrodynamic force, decreasing leakage magnetic field and electrical losses, and thus eliminating a series of problems caused by high stator current. Therefore, it makes it easier to fix the generator's ring leads, transition leads, and outgoing lines, resulting in a simpler and more reliable fixing structure. At the same time, it can effectively solve problems such as temperature rise of generator components, improve the reliability of the generator from the design source, and enable the various components of the generator to operate under more reasonable working conditions, which is especially suitable for ultra-large steam turbine generators. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] The structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0030] Figure 1 This application provides a structural schematic diagram of a double-outlet stator structure for a steam turbine generator.

[0031] Figure 2 A schematic diagram of the first winding layout of a double-outlet stator structure for a steam turbine generator provided in this application;

[0032] Figure 3 A schematic diagram of the first winding layout of another double-outlet stator structure for a steam turbine generator provided in this application;

[0033] Figure 4 and Figure 5A schematic diagram of another double-outlet stator structure for a steam turbine generator provided in this application;

[0034] Figure 6 This application provides a schematic diagram of the winding connection of a double-outlet stator structure for a steam turbine generator.

[0035] The annotations in the attached figures are explained as follows:

[0036] Stator 100, first winding 200, first sub-winding 210, second sub-winding 220, first coil 202, first end 1, second end 2, first wire bar 204, second wire bar 206, first terminal box 320, second terminal box 340, rotor 400, first neutral terminal 324, first terminal 322, second neutral terminal 344, second terminal 342. Detailed Implementation

[0037] The embodiments of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] As can be seen from the background section, with the increasing capacity of generators, especially for ultra-large generators, how to effectively overcome a series of problems caused by the sharp increase in stator current has become a key issue for those skilled in the art.

[0040] Based on the above, this application provides a three-phase steam turbine generator stator double-outlet structure, such as... Figure 1 As shown, Figure 1 This is a schematic diagram of a double-outlet stator structure for a steam turbine generator provided in this application. The double-outlet stator structure for a steam turbine generator includes a stator 100, a first winding 200 disposed on the stator 100, and steam end and excitation end located at opposite ends of the stator 100 along the axial direction of the stator 100.

[0041] The first winding 200 disposed on the stator 100 includes a first sub-winding 210 and a second sub-winding 220. Specifically, the first sub-winding 210 includes a plurality of first coils 202 connected end to end in sequence, and the second sub-winding 220 also includes a plurality of first coils 202 connected end to end in sequence. That is, both the first sub-winding 210 and the second sub-winding 220 include a plurality of first coils 202 connected end to end in sequence.

[0042] In this configuration, the first sub-winding 210 is led out from the excitation end, and the second sub-winding 220 is led out from the steam end. The electrical signal transmission direction of each first coil 202 in the first sub-winding 210 is the same as that of each first coil 202 in the second sub-winding 220. In other words, in the first winding 200 on the stator 100, the first sub-winding 210 and the second sub-winding 220 are led out from the excitation end and the steam end, respectively, and the electrical signal transmission direction of each first coil 202 is the same, regardless of whether it belongs to the first coil 202 of the first sub-winding 210 or the first coil 202 of the second sub-winding 220. In other words, although the first winding 200 includes a first sub-winding 210 and a second sub-winding 220 led out from the excitation end and the steam end respectively, since the electrical signal transmission direction of the first coil 202 in the first sub-winding 210 is the same as that of the first coil 202 in the second sub-winding 220, that is, the electrical signal transmission direction of each first coil 202 in the first winding 200 is the same, it is possible to achieve dual-end output from the excitation end and the steam end while ensuring the electrical performance of the turbine generator.

[0043] The aforementioned first winding 200 includes a first sub-winding 210 and a second sub-winding 220. The first sub-winding 210 is led out from the excitation end, and the second sub-winding 220 is led out from the steam end. Therefore, the first winding 200 includes both the portion led out from the excitation end and the portion led out from the steam end. That is, the stator double-outlet structure of this steam turbine generator is a double-outlet structure with outlets at both the excitation end and the steam end. With the total generator capacity and voltage remaining constant, the total current of the stator 100 also remains constant. However, if the steam turbine generator has outlets at both the excitation end and the steam end, the current of the stator 100 can be led out from the excitation end and the steam end respectively, thereby greatly reducing the current carried at each outlet. Because leakage eddy current losses and electrodynamic forces are proportional to the square of the current, when the current decreases, the electrodynamic forces and leakage eddy current losses at the stator core ends will be significantly reduced, thereby eliminating a series of problems caused by high current in the stator 100, which is especially suitable for ultra-large steam turbine generators.

[0044] As described above, the dual-outlet stator structure of this steam turbine generator effectively reduces the generator's electrodynamic force, leakage magnetic field, and electrical losses. It also makes fixing the generator's ring leads, transition leads, and outlets easier, resulting in a simpler and more reliable fixing structure. Furthermore, it effectively solves problems such as temperature rise in generator components, improving generator reliability from the design stage and allowing each component to operate under more suitable conditions. This not only reduces the failure rate of components and extends their service life but also improves the overall safety and reliability of the generator, lowers the risk of power outages caused by generator failures, and ensures the stable operation of the power system.

[0045] With the continuous development of the power industry, the requirements for generator capacity and performance are becoming increasingly stringent, and the market demand for ultra-large steam turbine generators is gradually increasing. The double-ended stator double-ended structure for steam turbine generators provided in this application can be widely applied in various types of ultra-large steam turbine generators, providing important technical support for the development of the power industry, and has broad market application prospects and significant economic benefits.

[0046] In one embodiment of this application, such as Figure 2 As shown, Figure 2 This application provides a schematic diagram of the arrangement of the first winding 200 of a double-lead stator structure for a steam turbine generator. Both the first sub-winding 210 and the second sub-winding 220 include a first end 1 and a second end 2. The first ends 1 and 2 of the first sub-winding 210 and the second sub-winding 220 are arranged in the same direction. Specifically, the arrangement direction of the first ends 1 and 2 can be the same as the arrangement direction of the first coil 202 on the stator 100, that is, the first ends 1 and 2 are arranged along the arrangement direction of the first coil 202. For example, the first ends 1 and 2 of the first sub-winding 210 and the second sub-winding 220 can both be arranged along a second direction, that is, the first ends 1 and 2 of the first sub-winding 210 and the second sub-winding 220 can both be arranged along the radial direction of the stator. The first sub-winding 210 has a plurality of first coils 202 located between a first end 1 and a second end 2, and the second sub-winding 220 has a plurality of first coils 202 located between a first end 1 and a second end 2. The first end 1 and the second end 2 of the first sub-winding 210 are led out via an excitation end, and the first end 1 and the second end 2 of the second sub-winding 220 are led out via a steam end. In other words, the first sub-winding 210 includes a plurality of first coils 202 located between its first end 1 and its second end 2, and the second sub-winding 220 includes a plurality of first coils 202 located between its first end 1 and its second end 2. The first end 1 and the second end 2 of the first sub-winding 210 are led out via an excitation end, and the first end 1 and the second end 2 of the second sub-winding 220 are led out via a steam end. It should be noted that the arrangement of the first coil 202 in the first sub-winding 210 and the second sub-winding 220 is the same, or in other words, the first coil 202 in the first sub-winding 210 and the first coil 202 in the second sub-winding 220 are arranged in the same way. The only difference between the first sub-winding 210 and the second sub-winding 220 is the lead-out end. Therefore, the coils in the first winding and the second sub-winding 220 are both referred to as the first coil 202.

[0047] In this design, the electrical signal transmitted by the first sub-winding 210 is input through the first terminal 1 and output through the second terminal 2. The electrical signal transmitted by the second sub-winding 220 is input through the second terminal 2 and output through the first terminal 1. That is, the electrical signal input and output terminals of the first sub-winding 210 are reversed relative to those of the second sub-winding 220. If the first terminal 1, the second terminal 2, and the first coil 202 located between the first terminal 1 and the second terminal 2 are considered as a single integrated structure, then if this integrated structure is used to form the first sub-winding 210, the first terminal 1 is the electrical signal input terminal and the second terminal 2 is the electrical signal output terminal; if this integrated structure is used to form the second sub-winding 220, the second terminal 2 is the electrical signal input terminal and the first terminal 1 is the electrical signal output terminal.

[0048] As can be seen from the above, since the first end 1 and the second end 2 of the first sub-winding 210 are led out through the excitation end, and the first end 1 and the second end 2 of the second sub-winding 220 are led out through the steam end, and the excitation end and the steam end are respectively located at opposite ends of the stator 100 along its axial direction, under the premise that the first coil 202 in the first sub-winding 210 and the second sub-winding 220 are arranged in the same way, the electrical signal input end and the output end of the first sub-winding 210 are set opposite to the electrical signal input end and the output end of the second sub-winding 220, so that the signal transmission direction of the first coil 202 in the first sub-winding 210 is the same as the signal transmission direction of the first coil 202 in the second sub-winding 220.

[0049] In addition, although the first sub-winding 210 and the second sub-winding 220 are led out from the excitation end and the steam end respectively, that is, the first sub-winding 210 and the second sub-winding 220 are led out from different output ends, the coils in the first sub-winding 210 are arranged in the same way, that is, the coils in the first winding 200 are arranged in the same way. This simplifies the structure of the first winding 200 and avoids the need to design a more complex first winding 200 because the first sub-winding 210 and the second sub-winding 220 are led out from different output ends.

[0050] In one embodiment of this application, the following continues... Figure 2As shown, the first sub-winding 210 includes M first coils 202 connected end to end in sequence, and the second sub-winding 220 includes N first coils 202 connected end to end in sequence, where M and N are integers greater than or equal to 1. The first coils 202 of both the first sub-winding 210 and the second sub-winding 220 include first rods 204 and 206 arranged opposite to each other. The first end 1 of the first sub-winding 210 is connected to the first rod 204 of the first first coil 202, and the second end 2 of the first sub-winding 210 is connected to the second rod 206 of the Mth first coil 202. The first end 1 of the second sub-winding 220 is connected to the first rod 204 of the first first coil 202, and the second end 2 of the second sub-winding 220 is connected to the first rod 204 of the Nth first coil 202. This arrangement ensures that the electrical signal input and output terminals of the first sub-winding 210 are opposite to those of the second sub-winding 220, achieving the same transmission direction for the electrical signals transmitted on each first coil 202. It should be noted that the first rods 204 and 206 extend along the axial direction of the stator.

[0051] Specifically, with Figure 2 For example, along the first direction, the upper end can be considered the steam end, and the lower end can be considered the excitation end. Each first coil 202 includes a first rod 204 and a second rod 206 arranged opposite each other along the second direction. The first rod 204 and the second rod 206 in the first coil 202 can be considered as the straight portion of the first coil 202. In addition to the straight portion, the first coil 202 also includes an involute portion located at the end of the straight portion. The involute portion is inclined relative to the straight portion and can also be called the oblique portion. It should be noted that the first direction can be understood as the axial direction of the stator 100, and the second direction can be understood as the radial direction of the stator 100.

[0052] The first wire bar 204 and the second wire bar 206 in the first coil 202 are connected by an involute to form the first coil 202. Adjacent first coils 202 are connected by involutes to form a first sub-winding 210 and a second sub-winding 220. According to Figure 2It can be seen that the first end 1 of the first sub-winding 210 is connected to the first wire bar 204 of the first first coil 202, the second end 2 of the first sub-winding 210 is connected to the second wire bar 206 of the Mth first coil 202, the first end 1 of the second sub-winding 220 is connected to the first wire bar 204 of the first first coil 202, and the second end 2 of the second sub-winding 220 is connected to the first wire bar 204 of the Nth first coil 202. That is, the electrical signal input and output terminals of the first sub-winding 210 are set opposite to those of the second sub-winding 220. It can also be regarded as the input and output terminals of the first sub-winding 210 and the second sub-winding 220 being mirror images of each other, so that the signal transmission direction of each first coil 202 in the first sub-winding 210 is the same as the signal transmission direction of each first coil 202 in the second sub-winding 220.

[0053] It should be noted that if the first winding 200 mentioned above is taken as the A-phase winding, then as follows... Figure 3 As shown, the first end 1 of the first sub-winding 210 and the second end 2 of the second sub-winding 220 can be considered as the ends connected to the external power grid, denoted as A1 and A2 respectively. The second end 2 of the first sub-winding 210 and the first end 1 of the second sub-winding 220 can be considered as grounding ends, denoted as X1 and X2 respectively. It should also be noted that in this application, for the A-phase winding, electrical signals, such as current, flow in through end A and flow out through end X. However, this application does not limit this; electrical signals can also flow in through end X and flow out through end A. That is, the first end 1 of the first sub-winding 210 and the second end 2 of the second sub-winding 220 can be considered as grounding ends, denoted as X1 and X2 respectively, and the second end 2 of the first sub-winding 210 and the first end 1 of the second sub-winding 220 can be considered as the ends connected to the external power grid, denoted as A1 and A2 respectively.

[0054] In one embodiment of this application, such as Figure 4 As shown, the dual-outlet stator structure of the steam turbine generator also includes a first outlet box 320 and a second outlet box 340. The first outlet box 320 is located at the excitation end, and the second outlet box 340 is located at the steam end. The first sub-winding 210 is led out through the first outlet box 320, and the second sub-winding 220 is led out through the second outlet box 340. It should be noted that... Figure 4 In the text, "400" represents the rotor, and Figure 4 The dashed lines in the diagram represent the central axis of the component in question.

[0055] With the first end 1 of the first sub-winding 210 and the second end 2 of the second sub-winding 220 considered as ends connected to the external power grid, and the second end 2 of the first sub-winding 210 and the first end 1 of the second sub-winding 220 considered as grounding ends, the first terminal box 320 is provided with a first neutral terminal 324 and a first terminal 322, and the first end 1 and the second end 2 of the first sub-winding 210 are respectively connected to the first terminal 322 and the first neutral terminal 324; the second terminal box 340 is provided with a second neutral terminal 344 and a second terminal 342, and the first end 1 and the second end 2 of the second sub-winding 220 are respectively connected to the first neutral terminal 324 and the second terminal 342. In other words, the end of the first sub-winding 210 used for connecting to the external power grid is connected to the first outgoing terminal 322 of the first outgoing box 320, the end of the first sub-winding 210 used for grounding is connected to the first neutral terminal 324 of the first outgoing box 320, the end of the second sub-winding 220 used for connecting to the external power grid is connected to the second outgoing terminal 342 of the second outgoing box 340, and the end of the second sub-winding 220 used for grounding is connected to the second neutral terminal 344 of the second outgoing box 340.

[0056] It should be noted that, compared to single-ended output, the turbine generator stator double-output structure provided in this application is a double-ended output structure with excitation end output and steam end output. This allows for a reduction in the number of outputs at each individual output end without reducing the total number of outputs, thereby reducing the size of each output end and simplifying the fixing structure, thus providing more space for the layout of the output box. Therefore, the aforementioned first output box 320 and second output box 340 can provide independent fixing and heat dissipation space for the annular leads, transition leads, and outputs of the first sub-winding 210 and the second sub-winding 220. Based on this, the double-output structure can be equipped with a dedicated fixing device inside the output box, which can firmly fix the annular leads, transition leads, and outputs, helping to ensure reliable mechanical fixing of the leads and outputs and preventing loosening due to vibration or other reasons during generator operation. Simultaneously, the output box can also be equipped with a complete cooling system, which can dissipate the heat generated by the leads and outputs in a timely manner, effectively solving the problem of cooling difficulties, ensuring that its operating temperature is within a reasonable range, and guaranteeing the stability and reliability of the generator during long-term operation.

[0057] In one embodiment of this application, the steam turbine generator further includes an output terminal and a neutral point terminal. The first output terminal 322 and the second output terminal 342 are both connected to the output terminal, and the first neutral terminal 324 and the second neutral terminal 344 are both connected to the neutral point terminal, thus achieving dual-ended output. Specifically, the aforementioned output terminal can be directly connected to the primary winding of the main transformer via a high-voltage cable or enclosed busbar. The transformer utilizes the principle of electromagnetic induction to increase or decrease the voltage (the voltage increase or decrease depends on the transformer turns ratio). The secondary winding of the transformer then outputs electrical energy that meets the voltage level and frequency requirements of the external power grid, which is then transmitted to the external power grid via transmission lines. The neutral point terminal can be grounded according to system grounding requirements through a grounding resistor, arc suppression coil, etc.

[0058] Therefore, in this application, the first end 1 of the first sub-winding 210 and the second end 2 of the second sub-winding 220 are led out through the corresponding outgoing terminals and connected together to the outgoing terminal, that is, connected in parallel at the outgoing terminal, and then connected to the primary winding of the main transformer through the outgoing terminal; the second end 2 of the first sub-winding 210 and the first end 1 of the second sub-winding 220 are led out through the corresponding neutral terminals and connected together to the neutral point, that is, connected in parallel at the neutral point, so as to realize the double-ended outgoing of the stator double-outgoing structure of the steam turbine generator.

[0059] In one embodiment of this application, the first winding 200 includes Q first coils 202, and the first winding 200 includes x first sub-windings 210 and y second sub-windings 220, where Q is an integer greater than or equal to 2, and x and y are integers greater than or equal to 1.

[0060] The first sub-winding 210 includes M first coils 202 connected end-to-end in sequence, and the second sub-winding 220 includes N first coils 202 connected end-to-end in sequence. Q is an integer greater than or equal to 2, and M and N are integers greater than or equal to 1, where x×M+y×N=Q, and M=N, x=y. That is, half of the multiple first coils 202 of the first winding 200 are led out through the excitation end, and the other half through the steam end. In other words, for the first winding 200, half of the current transmitted on it is led out through the excitation end, and the other half through the steam end, reducing the current carried at each output terminal to 50% of the traditional single-ended output method. Furthermore, since leakage eddy current losses and electrodynamic force are proportional to the square of the current, when the current carried at the output terminal is halved, the electrodynamic force and leakage eddy current losses are significantly reduced, thereby eliminating a series of problems such as the aforementioned mechanical fixing difficulties caused by the large current of the stator 100.

[0061] It should be noted that, although in the above embodiment, half of the plurality of first coils 202 of the first winding 200 are led out through the excitation end and the other half through the steam end, so that the current carried by each output terminal is reduced to 50% of the conventional single-ended output method, this application does not limit the specific amount of output wires led out through the excitation end and the steam end respectively. For example, 60% can be led out through the excitation end and 40% through the steam end, depending on the specific situation.

[0062] In one embodiment of this application, the three-phase steam turbine generator stator double-lead structure includes a first type of winding, a second type of winding, and a third type of winding. At least one of the first type of winding, the second type of winding, and the third type of winding includes a first winding 200, and the rest include a second winding. The second winding includes a plurality of second coils connected end to end in sequence, and the second coils are led out from the excitation end or the steam end. That is, at least one of the aforementioned first type of winding, the second type of winding, and the third type of winding adopts a double-leading method, while the rest are led out through a single-leading method.

[0063] In one embodiment of this application, the first type of winding, the second type of winding, and the third type of winding all include a first winding 200. That is, the first type of winding, the second type of winding, and the third type of winding all adopt a double-ended lead-out method to ensure that the structural layout of each type of winding is consistent as much as possible, thereby simplifying the structure of the steam turbine generator.

[0064] It should be noted that, as Figure 5 As shown, the first type of winding, the second type of winding, and the third type of winding can be respectively the A-phase winding, the B-phase winding, and the C-phase winding. Continuing as... Figure 5 As shown, the first terminal 1 of the first sub-winding 210 and the second terminal 2 of the second sub-winding 220 of phase A winding can be used to connect to the external power grid, denoted as A1 and A2 respectively. The second terminal 2 of the first sub-winding 210 and the first terminal 1 of the second sub-winding 220 of phase A winding can be used for grounding, denoted as X1 and X2 respectively. Similarly, the first terminal 1 of the first sub-winding 210 and the second terminal 2 of the second sub-winding 220 of phase B winding can be used to connect to the external power grid, denoted as B1 and B2 respectively. The second terminal 2 of the first sub-winding 210 and the first terminal 1 of the second sub-winding 220 of phase B winding can be used for grounding, denoted as Y1 and Y2 respectively. Likewise, the first terminal 1 of the first sub-winding 210 and the second terminal 2 of the second sub-winding 220 of phase C winding can be used to connect to the external power grid, denoted as C1 and C2 respectively. The second terminal 2 of the first sub-winding 210 and the first terminal 1 of the second sub-winding 220 of phase C winding can be used for grounding, denoted as Z1 and Z2 respectively. It should be noted that... Figure 5 In the text, "400" represents the rotor. Figure 5 The dashed lines in the diagram represent the central axis of the component in question. Additionally, Figure 5 This is a P-direction view representing the stator's dual-lead structure. Figure 4This is a side view representing the direction perpendicular to the plane containing the stator's dual-lead structure and the P-direction.

[0065] like Figure 6 As shown, if phase A, phase B, and phase C windings all use a double-ended lead-out configuration, terminals A1 and A2 of phase A winding are both connected to terminal A, which can be considered the lead-out terminal of phase A winding. Terminals X1 and X2 can be both connected to terminal X, which can be considered the neutral point terminal of phase A winding. Similarly, terminals B1 and B2 of phase B winding are both connected to terminal B, which can be considered the lead-out terminal of phase B winding. Terminals Y1 and Y2 can be both connected to terminal Y, which can be considered the neutral point terminal of phase B winding. Likewise, terminals C1 and C2 of phase C winding are both connected to terminal C, which can be considered the lead-out terminal of phase C winding. Terminals Z1 and Z2 can be both connected to terminal Z, which can be considered the neutral point terminal of phase C winding. It should be noted that terminals X, Y, and Z are known to be used for grounding, therefore, terminals X, Y, and Z can be combined.

[0066] In one embodiment of this application, the stator 100 includes a stator core and electrical shielding rings located at both ends of the stator core along its axial direction. The steam end and the excitation end are located at opposite ends of the stator core along its axial direction. A first sub-winding 210 is led out sequentially through the electrical shielding rings and the excitation end, and a second sub-winding 220 is led out sequentially through the electrical shielding rings and the steam end. It should be noted that the aforementioned electrical shielding rings can be copper electrical shielding rings.

[0067] The stator core has stepped end structures at both ends along its axial direction, with the radius of the end structures increasing closer to the ends of the stator core. This increases the diameter of the stator core's ends, guiding some of the axial leakage flux to radial flux and reducing the amount of leakage flux perpendicularly entering the core. Simultaneously, a full copper electric shielding ring is installed on the surface of the stator core ends to utilize the eddy currents induced by the high conductivity of the copper material to counteract leakage flux penetration.

[0068] The number of steps in the end structure of the stator core along its axial direction may be the same or different. It should be noted that the number of leads at the excitation end and the steam end is the same, and the number of steps in the end structure of the stator core along its axial direction can be the same.

[0069] For a single-ended turbine generator stator with double-ended stator, the stator is typically led out from the excitation end. However, the turbine generator stator with double-ended stator structure of this application uses stator leads at both the excitation and steam ends, requiring the addition of corresponding ring leads at the steam end. This increases the losses in the stator core at the steam end and strengthens the leakage magnetic field. Conversely, the current carried at the excitation end is halved, correspondingly reducing the losses in the stator core at the excitation end and weakening the leakage magnetic field.

[0070] These changes have led to some design modifications. When leakage flux increases at one end of the stator core (e.g., the steam end), the core objective is to suppress leakage flux expansion, reduce additional losses, and adjust the structure and cooling system to adapt to the heat generation changes. Specifically, 1) For the magnetic suppression structure design: the stator core end is designed as a stepped structure to enlarge the diameter of the core hole at both ends, guiding some of the axial leakage flux to radial flux, reducing the amount of leakage flux entering the core vertically; at the same time, a full copper electric shielding ring is added to the surface of the stator core end, using the eddy current induced by the high conductivity copper material to counteract leakage flux penetration; 2) For loss source control: a hollow non-magnetic retaining ring is used at the rotor coil end to fix the rotor end coil, reducing the impact of rotor end leakage flux on the stator core by increasing the leakage flux resistance; at the same time, the specifications of the silicon steel sheets at the stator core end are adjusted, using thin, low-loss silicon steel sheets to shorten the eddy current path, reduce eddy current losses, and reduce leakage flux concentration caused by local magnetic saturation. 3) For cooling system adaptation: To address end overheating caused by increased leakage flux, an independent ventilation channel is added to the stator core end, optimizing the ventilation path so that the cooling airflow directly covers the area where leakage flux is concentrated. 4) For local structural reinforcement: Small grooves are punched in the teeth of the stator core to block the continuous path of end eddy currents and reduce eddy current losses induced by leakage flux; an adhesive curing process is used at the stator core end to improve structural rigidity and avoid vibration amplification losses caused by leakage flux.

[0071] When leakage flux at one end of the stator core decreases (e.g., the excitation end), the core objective is to optimize magnetic circuit utilization, simplify redundant structures, and balance cooling system efficiency. 1) For magnetic circuit efficiency optimization: the air gap at the stator core end can be appropriately reduced, utilizing the space allowance from reduced leakage flux to improve the main magnetic circuit coupling efficiency; the stepped structure at the stator core end can be optimized, simplifying the number of steps and reducing processing complexity without increasing leakage flux. 2) For simplified structural design: if the reduction in leakage flux is significant, the size of the end copper electric shielding ring can be appropriately thinned or optimized based on loss calculations, or even replaced with a magnetically conductive and magnetically focused structure in local areas to reduce unnecessary eddy current losses; the end length of the first winding 200 can be optimized simultaneously, shortening the end extension while maintaining stable magnetic coupling, thus reducing winding copper losses. 3) For cooling system matching: To address the reduced end-point heat generation due to decreased leakage flux, ventilation system parameters can be adjusted, such as reducing the cooling airflow in the corresponding area and optimizing the ventilation baffle opening, thereby improving the cooling system efficiency while meeting heat dissipation requirements; the insulation coating of the stator core in low-loss areas uses conventional processes, requiring no additional reinforcement treatment, thus reducing manufacturing costs. 4) For rational material selection: With a stable reduction in leakage flux, the specifications of silicon steel sheets can be rationally adjusted according to the actual loss level, selecting more cost-effective materials while meeting performance requirements; at the same time, the core lamination process can be optimized, appropriately reducing the lamination coefficient, thereby reducing material usage without affecting magnetic circuit efficiency.

[0072] This application also provides a steam turbine generator device, including the three-phase steam turbine generator stator double-outlet structure described in any of the above embodiments.

[0073] In summary, this application provides a three-phase steam turbine generator stator double-outlet structure and a steam turbine generator device. The double-outlet stator structure includes a stator, a first winding disposed on the stator, and excitation and steam ends located at opposite ends of the stator. The first winding includes a first sub-winding and a second sub-winding, each including multiple first coils connected end-to-end in sequence. The first sub-winding is led out from the excitation end, and the second sub-winding is led out from the steam end. The electrical signal transmission direction of the first coils in the first sub-winding is the same as that of the first coils in the second sub-winding. Therefore, this double-outlet stator structure is a double-ended structure with lines leading from both the excitation and steam ends. The stator current is led out from both the excitation and steam ends, which can significantly reduce the current at each outlet, effectively reducing the generator's electrodynamic force, decreasing leakage magnetic field and electrical losses, and thus eliminating a series of problems caused by high stator current. Therefore, it makes it easier to fix the generator's ring leads, transition leads, and outgoing lines, resulting in a simpler and more reliable fixing structure. At the same time, it can effectively solve problems such as temperature rise of generator components, improve the reliability of the generator from the design source, and enable the various components of the generator to operate under more reasonable working conditions, which is especially suitable for ultra-large steam turbine generators.

[0074] The various embodiments in this specification are described in a progressive, parallel, or combined manner. Each embodiment focuses on its differences from other embodiments, and similar or identical parts between embodiments can be referred to interchangeably. For the apparatuses disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0075] It should be noted that, in the description of this application, the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0076] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0077] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-phase steam turbine generator stator double-outlet structure, characterized in that, The system includes a stator and a first winding disposed on the stator, as well as a steam end and an excitation end located at opposite ends of the stator along the axial direction of the stator. The first winding includes a first sub-winding and a second sub-winding, each of which includes a plurality of first coils connected end-to-end in sequence. The plurality of first coils in the first sub-winding and the second sub-winding are arranged in the same manner, wherein each of the first sub-winding and the second sub-winding includes a first end and a second end, and the plurality of first coils in the first sub-winding and the second sub-winding are located between their first end and second end. The first sub-winding is led out through the excitation end, and the second sub-winding is led out through the steam end. The electrical signal transmission direction of the first coil in the first sub-winding is the same as that of the electrical signal transmission direction of the first coil in the second sub-winding. Wherein, the first end and the second end of the first sub-winding are led out through the excitation end, and the first end and the second end of the second sub-winding are led out through the steam end; the electrical signal transmitted by the first sub-winding is input through the first end and output through the second end; the electrical signal transmitted by the second sub-winding is input through the second end and output through the first end. The first sub-winding includes M first coils connected end-to-end in sequence, and the second sub-winding includes N first coils connected end-to-end in sequence, where M and N are integers greater than or equal to 2; the first coils of both the first and second sub-windings include first and second rods arranged opposite each other; the first end of the first sub-winding is connected to the first rod of the first first coil, and the second end is connected to the second rod of the Mth first coil; the first end of the second sub-winding is connected to the first rod of the first first coil, and the second end is connected to the first rod of the Nth first coil.

2. The three-phase steam turbine generator stator double-outlet structure according to claim 1, characterized in that, The turbine generator stator double-outlet structure further includes a first outlet box and a second outlet box. The first outlet box is located at the excitation end, and the second outlet box is located at the steam end. The first sub-winding is led out through the first outlet box, and the second sub-winding is led out through the second outlet box. The first terminal box is provided with a first neutral terminal and a first outgoing terminal, and the first end and the second end of the first sub-winding are respectively connected to the first outgoing terminal and the first neutral terminal; The second terminal box is provided with a second neutral terminal and a second outgoing terminal, and the first end and the second end of the second sub-winding are respectively connected to the first neutral terminal and the second outgoing terminal.

3. The three-phase steam turbine generator stator double-outlet structure according to claim 2, characterized in that, The steam turbine generator also includes an output terminal and a neutral point terminal; Both the first and second outgoing terminals are connected to the outgoing terminal, and both the first and second neutral terminals are connected to the neutral point terminal.

4. The three-phase steam turbine generator stator double-outlet structure according to claim 1, characterized in that, The first winding includes Q first coils, and the first winding includes x first sub-windings and y second sub-windings, where Q is an integer greater than or equal to 4, and x and y are integers greater than or equal to 1. The first sub-winding includes M first coils connected end to end in sequence, and the second sub-winding includes N first coils connected end to end in sequence, x×M+y×N=Q, and M=N, x=y.

5. The three-phase steam turbine generator stator double-outlet structure according to claim 1, characterized in that, The turbine generator stator double-outlet structure includes a first type of winding, a second type of winding, and a third type of winding; At least one of the first type of winding, the second type of winding, and the third type of winding includes the first winding, and the rest include the second winding. The second winding includes a plurality of second coils connected end to end in sequence, and the second coils are led out through the excitation end or the steam end.

6. The three-phase steam turbine generator stator double-outlet structure according to claim 5, characterized in that, The first type of winding, the second type of winding, and the third type of winding all include the first type of winding.

7. The three-phase steam turbine generator stator double-outlet structure according to claim 1, characterized in that, The stator includes a stator core and electrical shielding rings located at both ends of the stator core along the axial direction. The steam end and the excitation end are located at opposite ends of the stator core along the axial direction. The first sub-winding is led out through the electrical shielding ring and the excitation end in sequence, and the second sub-winding is led out through the electrical shielding ring and the steam end in sequence. The stator core has stepped end structures at both ends along its axial direction, and the radius of the end structure is larger the closer it is to the end of the stator core. The number of steps in the end structures at both ends of the stator core along its axial direction may be the same or different.

8. A steam turbine generator set, characterized in that, Includes the three-phase steam turbine generator stator double-outlet structure as described in any one of claims 1-7.

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