Generator based on phase change cooling

Abstract

The application relates to the technical field of generators, and particularly provides a generator based on phase change cooling, aiming to solve the problem of complex pipeline structure of the existing generator cooling system. For the purpose, the generator based on phase change cooling comprises a stator winding, a main bus ring, a cross line and a condenser. The first flow channel is formed in the stator winding. The second flow channel is formed in the main bus ring, and the main bus ring is electrically connected with each branch of the stator winding. The third flow channel is formed in the cross line, and the third flow channel is communicated with the second flow channel. The cross line is used for connecting a plurality of pole phase groups of the same phase of the stator winding in series. The condenser is communicated with the main bus ring and the stator winding respectively. The pipeline system is arranged in communication among the first flow channel, the second flow channel and the third flow channel, so that the phase change working medium in the condenser can enter the first flow channel, then enter the third flow channel and the second flow channel in sequence along the first flow channel, or directly enter the second flow channel along the first flow channel. The application can simplify the liquid path system structure of the generator.

Description

Technical Field

[0001] This application relates to the field of generator technology, specifically providing a generator based on phase change cooling. Background Technology

[0002] The heat dissipation problem during the operation of hydro-generators directly affects their working efficiency and operational stability. Currently, evaporative cooling technology, which uses phase change materials as the cooling medium, is gradually being applied in hydro-generators due to its advantages over water cooling and air cooling, such as high cooling efficiency, good insulation performance, and low operating pressure of the self-circulating system.

[0003] In operation, the bus rings of hydro-generators typically use air cooling for heat dissipation. However, with the continuous development of motor technology, the internal circuitry of motors is becoming increasingly complex, and their heat dissipation requirements are also increasing. Traditional air cooling methods are insufficient to meet the heat dissipation needs of the bus rings. Therefore, phase change cooling technology has begun to be applied to the bus rings, which involves introducing a phase change working fluid inside the bus rings to achieve heat dissipation. Consequently, in some related technologies, both the stator windings and bus rings of the generator are equipped with corresponding cooling systems, allowing the phase change working fluid to flow through the stator windings and bus rings respectively for cooling. While the above methods improve the cooling efficiency of the generator to some extent, they also result in a more complex piping structure, increasing the space occupied by various functional components and raising the difficulty of equipment maintenance.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] This application aims to solve the aforementioned technical problem, namely, to address the issue of the complex piping structure of existing generator cooling systems.

[0006] In a first aspect, this application provides a generator based on phase change cooling, comprising:

[0007] The stator winding has a first flow channel formed in each bar unit for the phase change working fluid to pass through;

[0008] A main bus ring is arranged around the stator winding and located above the stator winding. A second flow channel for the phase change working fluid is formed inside the main bus ring. The main bus ring is electrically connected to each branch of the stator winding.

[0009] A jumper wire is located between the main bus ring and the stator winding. A third flow channel is formed in the jumper wire for the phase change working fluid to pass through. The third flow channel is connected to the second flow channel. The jumper wire is used to connect multiple pole phase groups of the same phase of the stator winding in series.

[0010] A condenser is located above the main busbar ring, and the condenser is connected to both the main busbar ring and the stator winding.

[0011] A piping system is provided between the first flow channel, the second flow channel, and the third flow channel, so that after the phase change working fluid in the condenser enters the first flow channel, it can sequentially enter the third flow channel and the second flow channel along the first flow channel, or directly enter the second flow channel along the first flow channel.

[0012] In one technical solution of the above-mentioned generator, the hydraulic system includes an electro-hydraulic separation device, the stator winding includes a first wire bar unit located at the end of any pole phase group and the end of any branch, and the electro-hydraulic separation device includes a first insulating pipeline and a first electrical connector;

[0013] When the electro-hydraulic separation device is connected between the first rod unit and the jumper wire, one end of the first insulating conduit is connected to the hollow wire of the first rod unit, and the other end is connected to the end of the jumper wire to connect the first flow channel and the third flow channel. The two ends of the first electrical connector are respectively electrically connected to the first rod unit and the jumper wire.

[0014] When the electro-hydraulic separation device is connected between the first bar unit and the main busbar, one end of the first insulating conduit is connected to the hollow wire of the first bar unit, and the other end is connected to the end of the main busbar to connect the first flow channel and the second flow channel. The two ends of the first electrical connector are respectively electrically connected to the first bar unit and the main busbar.

[0015] In one technical solution of the above-mentioned generator, the first electrical connection includes:

[0016] A first ring body surrounds the outer side of the hollow and solid wires of the first bar unit, and the inner surface of the first ring body is in contact with the first bar unit.

[0017] The first connector has one end connected to the first ring body and the other end connected to the jumper wire or the main bus ring.

[0018] In one technical solution of the above-mentioned generator, the stator winding includes a second rod unit, and the second rod unit and the first rod unit are located in the same stator slot;

[0019] The piping system further includes a second insulating conduit, one end of which is connected to the hollow conductor of the second bar unit, and the other end is connected to the main busbar or the jumper wire to connect the first flow channel with the second flow channel or the third flow channel.

[0020] In one technical solution of the above-mentioned generator, the stator winding includes a third rod unit, and the third rod unit is located between any adjacent first rod units along the circumferential direction of the stator winding.

[0021] The piping system further includes a third insulating conduit and a second electrical connector. One end of the third insulating conduit is connected to the hollow conductor of the third rod unit, and the other end is connected to the jumper wire or the main busbar to connect the first flow channel with the second flow channel or the third flow channel. The second electrical connector is connected between two radially adjacent third rod units.

[0022] In one technical solution of the above-mentioned generator, the second electrical connection includes:

[0023] Two second rings are respectively wrapped around the outside of the hollow and solid wires of the third wire bar unit, and the inner surface of the second rings is in contact with the third wire bar unit.

[0024] The second connector connects two adjacent second ring bodies.

[0025] In one technical solution of the above-mentioned generator, the third insulating conduit extends radially along the generator.

[0026] In one technical solution of the above-described generator, the third insulating conduit located within any of the cross-sectional areas of the jumper is connected to the jumper; and / or

[0027] The third insulating conduit located between adjacent jumpers is connected to the main bus ring.

[0028] In one technical solution of the above-mentioned generator, a junction box is provided between the first insulating conduit and the first rod unit, between the second insulating conduit and the second rod unit, and between the third insulating conduit and the third rod unit.

[0029] In one technical solution of the above-mentioned generator, the height of the jumper wire is lower than the height of the main bus ring.

[0030] By adopting the above technical solution, this application connects the stator winding, main busbar ring, and jumper wires through a piping system, forming a liquid circuit system where the first flow channel in the stator winding, the second flow channel in the main busbar ring, and the third flow channel in the jumper wires are interconnected. Thus, during generator operation, for the phase change working fluid circulation system, the main busbar ring and jumper wires are located downstream of the stator winding. The phase change working fluid from the condenser first passes through the stator winding and then through the jumper wires or the main busbar ring. This method can merge the liquid circuit systems of the stator winding and the busbar ring, eliminating the need for a separate gas collecting ring above the stator winding and omitting functional components such as liquid circuit connectors. At the same time, the stator winding and the busbar ring can share a set of condensers, which not only simplifies the liquid circuit structure and reduces the difficulty of system maintenance but also saves space. Attached Figure Description

[0031] The preferred embodiments of this application are described below with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the overall structure of a generator based on phase change cooling according to an embodiment of this application;

[0033] Figure 2 This is a partial structural schematic diagram of a generator based on phase change cooling according to an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the circuit composition of a stator winding bar unit according to an embodiment of this application;

[0035] Figure 4 This is a schematic diagram showing the connection between a first wire bar unit and a main bus ring or jumper wire according to an embodiment of this application;

[0036] Figure 5 This is a schematic diagram showing the connection between the second wire bar unit and the main bus ring or jumper wire according to an embodiment of this application;

[0037] Figure 6 This is a schematic diagram showing the connection between the third wire bar unit and the main bus ring or jumper wire according to an embodiment of this application.

[0038] In the figure, the reference numerals refer to the following:

[0039] 1. Stator winding; 11. Solid conductor; 12. Hollow conductor; 13. First bar unit; 14. Second bar unit; 15. Third bar unit; 2. Condenser; 3. Main busbar; 4. Jumper wire;

[0040] 101. Return pipe; 102. Gas collecting pipe; 103. Liquid collecting ring; 110. Electro-hydraulic separation device; 111. First insulating pipe; 112. First ring body; 113. First connector; 114. Combination box; 120. Second insulating pipe; 130. Third insulating pipe; 140. Second electrical connector; 141. Second ring body; 142. Second connector; 150. Fourth insulating pipe. Detailed Implementation

[0041] Preferred embodiments of this application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0042] It should be noted that in the description of this application, terms such as "upper," "lower," "left," "right," "inner," and "outer," which indicate direction or positional relationship, are based on the direction or positional relationship shown in the accompanying drawings. These terms are used merely for ease of description and do not indicate or imply that the relevant device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] Reference Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of a generator based on phase change cooling according to an embodiment of this application. Figure 2 This is a partial structural schematic diagram of a phase change cooling-based generator according to an embodiment of this application. Specifically, Figure 1 This is a cross-sectional view of the generator along its axial direction. Figure 2 It is a three-dimensional view of the top of the generator.

[0045] The phase-change cooling-based generator of this application includes a stator winding 1, a busbar ring, and a condenser 2. The stator winding 1 is mounted on a stator base. The busbar ring includes a main busbar ring 3 and a jumper wire 4. The condenser 2 is fixedly mounted on the upper part of the foundation pit and is located above the main busbar ring 3. Of course, the generator also includes necessary components such as a base, frame, and rotor, which are well known in the art and will not be described in detail here.

[0046] The stator winding 1, main busbar 3, jumper wire 4, and condenser 2 are connected by a piping system to achieve liquid and electrical connections between the aforementioned functional components. (Refer to...) Figure 1 The relative positions of the functional components of the generator are briefly described below. The piping system includes a return liquid pipe 101 and a gas collecting pipe 102 connected to both ends of the condenser 2. The return liquid pipe 101 extends downward from the end of the condenser 2 and connects to a liquid collecting ring 103. The liquid collecting ring 103 is arranged circumferentially along the generator to introduce phase change working fluid into each bar unit of the stator winding 1. The piping system also includes an electro-hydraulic separation device 110 disposed between the stator winding 1 and the main busbar 3 and the jumper wire 4. The electro-hydraulic separation device 110 is used to isolate the electrical connection and the liquid connection between the stator winding 1 and the main busbar 3 and the jumper wire 4 from each other. The gas collecting pipe 102 is connected between the condenser 2 and the main manifold 3, so that the liquid working fluid from the condenser 2 can flow through the stator winding 1 and then sequentially through the jumper wire 4 and the main manifold 3, or directly into the main manifold 3. Finally, the gas and liquid working fluids enter the condenser 2 through the gas collecting pipe 102.

[0047] Reference Figure 1 and 2 The main bus ring 3 is arranged around the stator winding 1 and located above the stator winding 1. The number of main bus rings 3 is determined according to the number of branches of the stator winding 1. The main bus ring 3 is electrically connected to each branch of the stator winding 1 and is used to lead out each branch of the stator winding 1, so that the main bus ring 3 can be connected in parallel with external electrical equipment. The jumper wire 4 is located radially between the main bus ring 3 and the stator winding 1 of the generator. Multiple jumper wires 4 are arranged circumferentially along the generator. The jumper wires 4 are used to connect multiple pole phase groups of the same phase of the stator winding 1 in series.

[0048] In one embodiment of this application, the stator winding 1 adopts a double-layer wave winding method, that is, two inner and outer wire bar units are arranged radially in each stator slot. (Refer to...) Figure 3This is a schematic diagram of the end of a bar unit of stator winding 1. Each bar unit includes a solid conductor 11 and a hollow conductor 12. The hollow conductor 12 is surrounded by the solid conductor 11 and extends outward from the end of the bar unit. A first flow channel for the phase change working fluid is formed inside the hollow conductor 12. The main bus ring 3 and the jumper wire 4 are both hollow inside. For example, in some implementations, the main bus ring 3 and the jumper wire 4 can be copper tube structures, thereby forming a second flow channel for the phase change working fluid inside the main bus ring 3 and a third flow channel for the phase change working fluid inside the jumper wire 4. The third flow channel is connected to the second flow channel through an insulating conduit.

[0049] Reference Figure 2 To facilitate the description of the fluid and electrical connections between the stator winding 1 and the busbar ring, this application divides the stator winding 1 into three categories: a first bar unit 13, a second bar unit 14, and a third bar unit 15. The first bar unit 13 comprises the bar unit at the end of any pole phase group and the bar unit at the end of any branch. The first bar unit 13 is connected to the end of the jumper wire 4 and the end of the main busbar ring 3, respectively. Here, "connection" includes both fluid and electrical connections. The second bar unit 14 is the bar unit located in the same stator slot as the first bar unit 13. That is, the first bar unit 13 and the second bar unit 14 are two bar units radially spaced within the same stator slot. The second bar unit 14 can be directly connected to the main busbar ring 3 or the jumper wire 4. Here, "connection" refers only to fluid connections. The third wire bar unit 15 is a wire bar unit located between any adjacent first wire bar units 13 (or second wire bar units 14) in the circumferential direction of the stator winding 1. It can be seen that at any position in the circumferential direction of the stator winding 1, there are two third wire bar units 15 arranged radially in the same stator slot. Both of the above-mentioned third wire bar units 15 can be directly connected to the main bus ring 3 or the jumper wire 4. The "connection" here is also only a hydraulic connection.

[0050] Reference Figure 2 and Figure 4 The electro-hydraulic separation device 110 includes a first insulating conduit 111 and a first electrical connector. The first insulating conduit 111 and the first electrical connector are two separate components. In one embodiment of this application, the first electrical connector includes a first ring body 112 and a first connector 113.

[0051] When the electro-hydraulic separation device 110 is connected between the first wire rod unit 13 and the jumper wire 4, one end of the first insulating pipe 111 is connected to the hollow wire of the first wire rod unit 13, and the other end is connected to the end of the jumper wire 4, allowing the phase change working fluid to enter the jumper wire 4 through the first insulating pipe 111, thereby connecting the first flow channel and the third flow channel. Optionally, a manifold box 114 is also provided between the first insulating pipe 111 and the hollow wire of the first wire rod unit 13, so that during the circulation of the phase change working fluid, the liquid phase working fluid or the gas-liquid two-phase working fluid in the first flow channel first collects into the manifold box 114, and then enters the jumper wire 4 through the first insulating pipe 111. In this way, the manifold box 114 is located between the first insulating pipe 111 and the hollow wire of the first wire rod unit 13, which can reasonably collect the working fluid from multiple hollow wires and effectively solve the problem of liquid connection between multiple hollow wires and the first insulating pipe 111.

[0052] The first ring 112 is arranged around the outside of the hollow and solid wires of the first wire rod unit 13, "tightly wrapping" the first wire rod unit 13. This ensures that the inner surface of the first ring 112 fits against the first wire rod unit 13, thereby not only achieving electrical connection between the first ring 112 and the first wire rod unit 13, but also binding the wire bundle at the end of the first wire rod unit 13. The first connector 113 can be an L-shaped connector, with one end fixedly connected to the first ring 112 and the other end fixedly connected to the jumper wire 4, thus achieving electrical conduction between the first wire rod unit 13, the first ring 112, the first connector 113, and the jumper wire 4.

[0053] Similarly, when the electro-hydraulic separator 110 is connected between the first wire rod unit 13 and the main busbar 3, one end of the first insulating conduit 111 is connected to the hollow wire of the first wire rod unit 13, and the other end is connected to the end of the main busbar 3, thereby connecting the first flow channel and the second flow channel. The connection method and technical effect of the electro-hydraulic separator 110 at this position are similar to those described in the application to the jumper wire 4, and will not be elaborated further here.

[0054] It is understandable that, based on the circuit connection inside the generator, for the jumper wire 4, both ends are connected to the corresponding first rod unit 13 through the electro-hydraulic separation device 110. For the main bus ring 3, one end of its internal second flow channel is a closed device, and this end is connected to external electrical equipment to achieve energy storage. Therefore, the main bus ring 3 is only connected to the corresponding first rod unit 13 through the electro-hydraulic separation device 110 at the end closest to the stator winding 1.

[0055] Reference Figure 2 and Figure 5The piping system also includes a second insulated conduit 120. One end of the second insulated conduit 120 is connected to the hollow conductor of the second rod unit 14, and the other end can be connected to the main busbar 3 or the jumper wire 4. It is understood that when the second insulated conduit 120 is connected to the main busbar 3, the first flow channel and the second flow channel are connected. At this time, the phase change working fluid flows sequentially through the first flow channel, the third flow channel, and the second flow channel, and finally returns to the condenser 2. When the second insulated conduit 120 is connected to the jumper wire 4, the first flow channel and the third flow channel are connected. At this time, the phase change working fluid directly enters the third flow channel through the first flow channel and finally returns to the condenser 2. Regardless of which method is used, the self-circulation of the working fluid can be achieved, and this application does not impose any limitations on this.

[0056] Similarly, a junction box 114 is also provided between the second insulating conduit 120 and the hollow conductor of the second rod unit 14. The connection and function of the junction box 114 at this location are similar to those described above, and will not be repeated here.

[0057] Reference Figure 2 and Figure 6 The piping system also includes a third insulating conduit 130 and a second electrical connector 140. One end of the third insulating conduit 130 is connected to the hollow conductor of the third rod unit 15, and the other end is connected to the jumper wire 4 or the main busbar ring 3. Similarly, a manifold box 114 is provided between the third insulating conduit 130 and the hollow conductor of the third rod unit 15. The difference from the first rod unit 13 and the second rod unit 14 mentioned above is that the manifold box 114 connects two third rod units 15 in each stator slot. When the third insulating conduit 130 is connected to the jumper wire 4, the phase change working fluid in the first flow channel flows sequentially through the third flow channel and the second flow channel; when the third insulating conduit 130 is connected to the main busbar ring 3, the phase change working fluid in the first flow channel directly enters the second flow channel.

[0058] It should be noted that the aforementioned third insulating conduit 130 only enables the fluid connection between the third rod unit 15 and the main manifold 3 or the jumper wire 4. The second electrical connector 140 connects two radially adjacent third rod units 15 (i.e., two third rod units 15 in the same stator slot), and the electrical connection between the third rod units 15 is achieved through the second electrical connector 140.

[0059] Optionally, the second electrical connector 140 includes two second rings 141 and a second connector 142. The two second rings 141 respectively surround the outer sides of the hollow and solid wires of two radially adjacent third rod units 15, binding the wire bundles at the ends of the third rod units 15. Simultaneously, the inner surface of the second ring 141 fits against the third rod unit 15 to achieve an electrical connection between the third rod unit 15 and the second ring 141. The second connector 142 connects two radially adjacent second rings 141 to achieve an electrical connection between the two second rings 141, thus allowing the third rod units 15 to be connected in series.

[0060] Reference Figure 2 The jumper wire 4 is connected to the main bus ring 3 via a fourth insulating conduit 150. In one embodiment of this application, the fourth insulating conduit 150, the third insulating conduit 130, and the second insulating conduit 120 all extend radially along the generator, thereby minimizing the flow path of the phase change working fluid and reducing pressure loss caused by fluid turning during flow, thus improving the circulation efficiency of the working fluid. It should be noted that "extending radially along the generator" is not limited to the radial line of the generator; the projections of the fourth insulating conduit 150, the third insulating conduit 130, and the second insulating conduit 120 in the radial plane of the generator simply need to coincide with the radial line of the generator.

[0061] Specifically, the third insulating conduit 130 is divided into two parts: the third insulating conduit 130 located in the area spanned by any of the jumper wires 4 is connected to the jumper wire 4, and the third insulating conduit 130 located between adjacent jumper wires 4 is connected to the main bus ring 3, thereby enabling the third insulating conduit 130 to extend radially along the generator.

[0062] As described above, this application connects the stator winding 1, the main busbar 3, and the jumper wire 4 through a pipeline system, forming a liquid circuit system where the first flow channel in the stator winding 1, the second flow channel in the main busbar 3, and the third flow channel in the jumper wire 4 are interconnected. Thus, during generator operation, for the phase change working fluid circulation system, the main busbar 3 and the jumper wire 4 are located downstream of the stator winding 1. The phase change working fluid from the condenser 2 first passes through the stator winding 1, and then through the jumper wire 4 or the main busbar 3. This method can combine the liquid circuit systems of the stator winding 1 and the busbar 3, eliminating the need for a separate gas collecting ring above the stator winding 1 and omitting functional components such as liquid circuit connectors. At the same time, the stator winding 1 and the busbar 3 can share a set of condensers 2, which not only simplifies the liquid circuit structure and reduces the difficulty of system maintenance, but also saves space.

[0063] On the other hand, since the phase change working fluid flows through stator winding 1 and then through the busbar ring during the circulation process, the working fluid can be utilized in stages according to the heat generated by stator winding 1 and busbar ring, so that the cooling capacity of the working fluid can be fully utilized.

[0064] In one embodiment of this application, the height of the jumper wire 4 is lower than the height of the main busbar ring 3. This facilitates the rise of bubbles during the boiling process of the working fluid, thereby providing a circulating pressure head for the flow of the working fluid. It should be noted that the above method is only one optional embodiment of this application. In practical applications, in order to reduce the overall height of the busbar ring, the jumper wire 4 can also be made at the same height as the main busbar ring 3. Those skilled in the art can make adaptive adjustments according to actual application needs, and all modifications made to such height adjustments should be within the scope of protection of this application.

[0065] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A generator based on phase change cooling, characterized in that, include: Stator winding (1), each bar unit has a first flow channel for the phase change working fluid to pass through; The main bus ring (3) is arranged around the stator winding (1) and located above the stator winding (1). A second flow channel for the phase change working fluid is formed inside the main bus ring (3). The main bus ring (3) is electrically connected to each branch of the stator winding (1). A jumper wire (4) is located between the main bus ring (3) and the stator winding (1). A third flow channel for the phase change working fluid is formed in the jumper wire (4). The third flow channel is connected to the second flow channel. The jumper wire (4) is used to connect multiple pole phase groups of the same phase of the stator winding (1) in series. The condenser (2) is located above the main busbar (3) and is connected to the main busbar (3) and the stator winding (1) respectively. The pipeline system is connected between the first flow channel, the second flow channel and the third flow channel so that after the phase change working fluid in the condenser (2) enters the first flow channel, it can sequentially enter the third flow channel and the second flow channel along the first flow channel, or directly enter the second flow channel along the first flow channel; The pipeline system includes an electro-hydraulic separation device (110), the stator winding (1) includes a first bar unit (13) located at the end of any pole phase group and the end of any branch, and the electro-hydraulic separation device (110) includes a first insulating pipeline (111) and a first electrical connector; When the electro-hydraulic separation device (110) is connected between the first wire bar unit (13) and the jumper wire (4), one end of the first insulating conduit (111) is connected to the hollow wire of the first wire bar unit (13), and the other end is connected to the end of the jumper wire (4) to connect the first flow channel and the third flow channel. The two ends of the first electrical connector are electrically connected to the first wire bar unit (13) and the jumper wire (4) respectively. When the electro-hydraulic separation device (110) is connected between the first wire bar unit (13) and the main busbar (3), one end of the first insulating conduit (111) is connected to the hollow wire of the first wire bar unit (13), and the other end is connected to the end of the main busbar (3) to connect the first flow channel and the second flow channel. The two ends of the first electrical connector are electrically connected to the first wire bar unit (13) and the main busbar (3) respectively.

2. The generator according to claim 1, characterized in that, The first electrical connector includes: The first ring body (112) surrounds the hollow and solid wires of the first wire bar unit (13), and the inner surface of the first ring body (112) is in contact with the first wire bar unit (13). The first connector (113) has one end connected to the first ring body (112) and the other end connected to the jumper wire (4) or the main bus ring (3).

3. The generator according to claim 1, characterized in that, The stator winding (1) includes a second rod unit (14), which is located in the same stator slot as the first rod unit (13); The piping system also includes a second insulating conduit (120), one end of which is connected to the hollow conductor of the second bar unit (14), and the other end is connected to the main busbar (3) or the jumper wire (4) to connect the first flow channel with the second flow channel or the third flow channel.

4. The generator according to claim 3, characterized in that, The stator winding (1) includes a third bar unit (15), which is located between any adjacent first bar units (13) along the circumferential direction of the stator winding (1). The piping system further includes a third insulating conduit (130) and a second electrical connector (140). One end of the third insulating conduit (130) is connected to the hollow conductor of the third rod unit (15), and the other end is connected to the jumper wire (4) or the main bus ring (3) to connect the first flow channel with the second flow channel or the third flow channel. The second electrical connector (140) is connected between two radially adjacent third rod units (15).

5. The generator according to claim 4, characterized in that, The second electrical connector (140) includes: Two second ring bodies (141) are respectively wrapped around the outside of the hollow wire and the solid wire of the third wire bar unit (15), and the inner surface of the second ring body is in contact with the third wire bar unit (15); The second connector (142) connects two adjacent second ring bodies (141).

6. The generator according to claim 4, characterized in that, The third insulating conduit (130) extends radially along the generator.

7. The generator according to claim 4, characterized in that, The third insulating conduit (130) located within the area spanned by any of the jumpers (4) is connected to the jumper (4); and / or The third insulating conduit (130) located between adjacent jumper wires (4) is connected to the main bus ring (3).

8. The generator according to claim 4, characterized in that, A junction box (114) is provided between the first insulating conduit (111) and the first bar unit (13), between the second insulating conduit (120) and the second bar unit (14), and between the third insulating conduit (130) and the third bar unit (15).

9. The generator according to any one of claims 1 to 8, characterized in that, The height of the jumper wire (4) is lower than the height of the main bus ring (3).

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