Leading-out wire structure on stator of large-scale steam turbine generator

Abstract

The utility model discloses an upper leading-out wire structure of a large steam turbine generator stator, which comprises a leading-out wire copper bar, a leading-out wire terminal, an external wind shield, a metal ventilation pipe, a flexible connector, a connecting terminal, a support plate and an internal wind shield, the leading-out wire structure is positioned at the upper end of the generator stator, and the head end of the leading-out wire copper bar is welded and fixed with the leading-out wire terminal. And the tail end of the connecting terminal is welded and fixed with the connecting terminal and is connected with the generator stator parallel ring through flexible connection, so that a complete electrical channel is formed. The hollow leading-out wire is simple and reliable in structure and convenient to mount and dismount, the temperature of a main lead of an existing large steam turbine generator is further reduced due to the design of the hollow leading-out wire, the safety and the reliability of a unit are improved, and the hollow leading-out wire can be widely applied to the design of air-cooled generator stator leading-out wires.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine generators, and in particular to a stator lead wire structure for a large steam turbine generator. Background Technology

[0002] The stator leads of a steam turbine generator are key components for power output. This is especially true for generators with reverse ventilation structures, where external airflow exits from the end covers on both sides of the generator, is cooled by the cooler, and then enters from below the frame. This causes the operating environment of the traditional bottom lead structure to change from a cold air zone to a hot air zone, which is detrimental to the heat dissipation of the leads themselves. To address this issue, traditional bottom lead structures also use hollow copper wires. However, due to the long copper busbars, cooling efficiency is not easily improved. Furthermore, the bottom lead structure requires a separate external ventilation duct and additional lead support, making the overall structure very complex. Regular inspection, maintenance, and replacement of some components are necessary, resulting in high costs. The bottom lead structure is located within the civil engineering foundation, severely limiting operating space, and installation and dismantling can only be done manually, leading to long processing times. Summary of the Invention

[0003] The purpose of this utility model is to disclose a stator lead-out wire structure for a large steam turbine generator. While achieving electrical connection, it enhances the cooling capacity of the lead-out wire copper busbar, preventing overheating and accidents. Simultaneously, it reduces manufacturing and maintenance costs. This steam turbine generator stator lead-out wire structure features reliability, stability, convenient installation and disassembly, and low cost. The technical solution of this utility model is as follows: A large steam turbine generator stator lead-out wire structure comprises a lead-out wire copper busbar, lead-out terminals, an external wind baffle, a metal ventilation pipe, a flexible connection, a connecting terminal, a support plate, and an internal wind baffle. The lead-out terminals are welded and fixed to the upper end of the lead-out wire copper busbar, and have engagement holes. Connecting terminals with engagement holes are welded to the tail end of the lead-out wire copper busbar and connected to the generator stator in parallel via a flexible connection, forming an electrical channel.

[0004] In the above-mentioned large steam turbine generator stator lead-out structure, the lead-out copper busbar is located above the stator parallel ring, passes through the stator frame and the top cover, and the lead-out terminal is located on the generator.

[0005] In the above-mentioned large steam turbine generator stator lead wire structure, the lead wire copper busbar is a single row of hollow conductors, which is welded and fixed to the metal ventilation pipe and connecting terminal.

[0006] In the above-mentioned large steam turbine generator stator lead-out structure, the lead-out terminal is made of copper and is T-shaped. The lower end of the T-shape is welded and fixed to the lead-out copper busbar, and the upper end has a through hole for connecting to the enclosed busbar.

[0007] In the above-mentioned large steam turbine generator stator lead-out structure, the connecting terminal is a copper machined part with a concave cross-section and through holes on both sides of the concave shape, which is then connected and fixed with the flexible connection.

[0008] In the above-mentioned large steam turbine generator stator lead wire structure, the lead wire copper busbar has a circular hollow structure inside, and a circular ventilation hole is opened 195mm from its top. The circular ventilation hole is connected to the inner hole of the lead wire copper busbar.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. The stator lead wires of this utility model adopt a hollow copper busbar structure, which can directly draw cold air from inside the generator frame. After flowing through the lead wire copper busbars, the air is discharged into the hot air zone of the generator frame, realizing direct cooling inside the lead wire copper busbars, preventing overheating of the lead wire copper busbars and causing accidents, and greatly improving the safety and reliability of generator operation.

[0011] 2. After installation, this utility model effectively improves the electromagnetic force resistance and vibration resistance at the connection point because of the flexible connection structure between the lead-out copper busbar and the stator parallel ring.

[0012] It offers better stability and is more suitable for the long-term safe and stable operation of the unit.

[0013] 3. Traditional technologies employ a bottom-outlet structure, resulting in excessively long copper busbars for the leads. The large current flowing through these leads creates a strong alternating magnetic field, causing centrifugal force between the leads and potentially leading to serious accidents. Sufficient support is required during design and installation, resulting in an exceptionally complex structure. Furthermore, space constraints within the foundation lead to time-consuming installation and maintenance, making installation and disassembly extremely cumbersome. In contrast, this invention uses a top-outlet stator design, reducing the lead length by 2 meters and eliminating the need for insulating ventilation pipes. This reduces the number of foundation components and support structures, significantly lowering economic costs. Simultaneously, the simplified structure reduces assembly and disassembly difficulty, significantly decreasing installation and maintenance workload and effectively reducing time costs.

[0014] 4. The main lead structure of this utility model is located above the generator, with a large installation space, which facilitates on-site installation, inspection and maintenance by users, and solves the problem of limited space when constructing the generator stator lower lead structure. Attached Figure Description

[0015] Figure 1 A structural diagram of the lead-out wires on the stator of a large steam turbine generator;

[0016] Figure 2 This is a schematic diagram of the outgoing terminal;

[0017] Figure 3 It features flexible connections, copper busbars with leads, and parallel ring connections.

[0018] Figure 4 This is a schematic diagram of the copper busbar structure for the lead wires;

[0019] Figure 5 Diagram showing the welding and fixing of the copper busbar to the metal ventilation duct;

[0020] Figure 6 Cooling airflow diagram for stator main leads;

[0021] The markings in the diagram are as follows: 1-lead copper busbar; 2-outlet terminal; 3-external wind baffle; 4-metal ventilation duct; 5-flexible connection; 6-connection terminal; 7-support plate; 8-internal wind baffle. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1 As shown, a stator lead-out structure for a large steam turbine generator comprises lead-out copper busbars 1, lead-out terminals 2, external wind baffles 3, metal ventilation pipes 4, flexible connections 5, connecting terminals 6, fixing plates 7, and internal wind baffles 8. The first and last ends of the lead-out copper busbars 1 are welded and fixed to the lead-out terminals 2 and connecting terminals 6, respectively. The connecting terminals 6 are connected to the parallel ring of the generator stator via flexible connections 5 to form an electrical path. The connecting terminals 6 and flexible connections 5 are fixed together with bolts. The lead-out copper busbars 1 are clamped and fixed together by insulating support plates 7 to improve vibration resistance. External wind baffles 3 and internal wind baffles 8 made of insulating material are installed at the positions where the lead-out copper busbars 1 pass through the base and the top cover, forming an airflow isolation inside the stator base and the top cover to achieve a sealing effect.

[0025] like Figure 2 As shown, the outgoing terminal 2 is a T-shaped copper machining part, with six through holes on the upper side of the T-shape that cooperate with the closed busbar.

[0026] like Figure 3As shown, the connecting terminal 6 is a groove-shaped copper part. The groove is wide in the middle and narrow on both sides. Six through holes are opened on the narrow side for engaging and fixing with the flexible connection 5. The groove depth is set to be 35mm higher than the top of the flexible connection 5 after engaging and fixing with the flexible connection 5 to avoid interference. A ventilation hole is machined at the bottom of the groove. This ventilation hole is aligned with the ventilation hole at the tail end of the lead wire copper busbar 1 and then welded and fixed.

[0027] like Figure 4 , Figure 5 As shown, the lead-out copper busbar 1 is a hollow copper busbar with a ventilation hole inlet at its tail end and a sealed top end. A circular ventilation hole is opened 195mm away from the top of the lead-out copper busbar 1 and welded and fixed to the metal ventilation pipe 4 to form the internal air passage of the lead-out structure.

[0028] like Figure 6 As shown, the cooling method of the stator lead wire structure is direct internal cooling. The pressure generated by the rotor fan causes the cold air in the frame to enter the lead wire copper busbar 1 through the ventilation hole of the connection terminal 6. After cooling, it is discharged from the metal ventilation pipe 4 to the hot air area of ​​the top cover and enters the overall air circulation of the generator. This direct internal cooling method has a better cooling effect and improves the safety and reliability of generator operation.

[0029] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A stator lead-out structure for a large steam turbine generator, characterized in that: The whole is composed of lead-out copper busbar (1), lead-out terminal (2), external wind baffle (3), metal ventilation pipe (4), flexible connection (5), connecting terminal (6), support plate (7) and internal wind baffle (8). The lead-out terminal (2) is welded and fixed to the upper end of the lead-out copper busbar (1). The lead-out terminal (2) has a clamping hole. The connecting terminal (6) with the clamping hole is welded to the tail end of the lead-out copper busbar (1) and connected to the generator stator in parallel ring through the flexible connection (5) to form an electrical channel.

2. The stator lead-out structure of a large steam turbine generator according to claim 1, characterized in that: The lead-out copper busbar (1) is located above the stator parallel ring, passes through the stator frame and the top cover, and the lead-out terminal (2) is located outside the top cover of the generator.

3. The stator lead-out structure of a large steam turbine generator according to claim 1, characterized in that: The lead-out copper busbar (1) is a single-row hollow conductor, which is welded and fixed to the metal ventilation pipe (4) and the connecting terminal (6).

4. The stator lead-out structure of a large steam turbine generator according to claim 1, characterized in that: The outgoing terminal (2) is made of copper and is T-shaped. The lower end of the T-shape is welded and fixed to the copper busbar (1), and the upper end has a through hole for connecting to the closed busbar.

5. The stator lead-out structure of a large steam turbine generator according to claim 1, characterized in that: The connecting terminal (6) is a copper machined part with a concave cross-section and through holes on both sides of the concave shape, which are fixed together with the flexible connection (5).

6. The stator lead-out structure of a large steam turbine generator according to claim 2, characterized in that: The lead-out copper busbar (1) has a circular hollow structure inside, and a circular ventilation hole is opened 195mm from its top. The circular ventilation hole is connected to the inner hole of the lead-out copper busbar (1).

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