Phase-change switch for large generator

Abstract

The invention discloses a phase-change switch for a large generator, which adopts a three-phase five-stage structure, one phase comprises an isolating switch and two grounding switches which are arranged on a bottom frame, the isolating switch is arranged in the middle, the grounding switches are arranged on two sides of a fracture of the isolating switch, the isolating switch comprises a main through-flow loop assembly, and the main through-flow loop assembly comprises a main through-flow loop assembly and a main through-flow loop assembly. The main through-flow loop assembly is installed on the bottom frame through a large supporting insulator and a small supporting insulator which are located at the two ends of the main through-flow loop assembly respectively, the main through-flow loop assembly is composed of a wire inlet base, a moving contact body and a wire outlet base, and the moving contact body is connected with the wire inlet base and the wire outlet base through watchband contact fingers arranged at the two ends of the moving contact body; and the grounding switch comprises a grounding static contact integrated with the wire inlet seat and the wire outlet seat. The disconnecting switch and the grounding switch are both of a single-contact plug-in type structure, visible fractures are provided, observation and maintenance are convenient, the grounding switch is designed to be integrated on the disconnecting switch, and the structure is novel, simple and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of phase-changing switches, and in particular to a phase-changing switch used for a large generator. Background Art

[0002] As maintenance switches, isolating switches and earthing switches play a vital role in ensuring personal and equipment safety in the high-voltage switch industry. In the power system, the technology of isolating switches and earthing switches is basically mature, but the products are single, and the rated current and short-time withstand current are very small. The largest isolating switch using double knife switches in parallel can only barely reach 10,000A, and the short-time withstand current is 100kA.

[0003] At present, with the increasing number of pumped storage power stations and their capacity constantly rising, specifically, a 400MVA unit is equipped with a phase-changing switch with a rated voltage of 24kV, and its rated current reaches 16000A. The phase-changing switch plays an important role in the pumped storage power generation system. In order to meet the different requirements of phase sequence for pumping direction and power generation direction, the phase-changing switch has to be closed and opened several times a day. Therefore, the requirements for mechanical life are particularly strict. The standard requires a mechanical life of 10,000 times for M2 level. Now most pumped storage power stations require 20,000 times of use. These are far more than the requirements specified in the isolation switch standards, cannot meet actual needs, and require frequent maintenance and replacement.

[0004] To this end, the present application specifically proposes a phase-changing switch for a large generator to solve the above technical problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a phase-changing switch for a large generator which is applied to a pumped storage power station and is convenient for observation and maintenance.

[0006] The present invention adopts the following technical solutions to solve the above technical problems:

[0007] A phase-changing switch for a large generator adopts a three-phase five-level structure, wherein one phase includes an isolating switch and two grounding switches arranged on a base frame, the isolating switch is arranged in the middle, and the grounding switches are arranged on both sides of the isolating switch break, wherein:

[0008] The isolating switch comprises a main current-carrying circuit assembly, which is mounted on a base frame through a large supporting insulator and a small supporting insulator respectively located at two ends, and the main current-carrying circuit assembly consists of an incoming wire seat, a moving contact body and an outgoing wire seat, and the moving contact body is connected to the incoming wire seat and the outgoing wire seat through strap contact fingers arranged at two ends;

[0009] The grounding switch comprises a grounding static contact which is integrated with an inlet seat and an outlet seat.

[0010] Preferably, the phase-changing switch also includes a motor, a manually-operated anti-error mechanism and a T-shaped right-angle commutator, the right-angle commutator is vertically mounted on a base frame, and the motor and the manually-operated anti-error mechanism are respectively connected on both sides of the right-angle commutator, and the right-angle commutator is connected along a vertical output direction with an insulating rod for supporting the phase-changing switch.

[0011] Preferably, the isolating switch is driven horizontally by an electric motor, a manually operated anti-error mechanism and an isolating screw lifter on a main current circuit assembly, and the isolating screw lifter is installed inside the incoming line seat.

[0012] Preferably, a grounding moving contact is provided at the bottom of the grounding static contact;

[0013] A guide cylinder is installed in the inner cavity of the grounding static contact, and a plurality of grooves for embedding spring contact fingers are opened in the inner cavity of the grounding static contact, and the spring contact fingers are in contact with the guide cylinder;

[0014] A grounding soft flat wire and a grounding screw rod lifter are sequentially arranged at the lower end of the grounding moving contact, and the grounding soft flat wire is overlapped with the outer shell of the phase-changing switch.

[0015] Preferably, the grounding switch is vertically driven by a motor, a manually operated anti-error mechanism and a grounding screw lifter.

[0016] Preferably, the inlet and outlet seats are arranged as tubular structures, the wiring parts of the inlet and outlet seats are arranged as polygonal structures, the outer surfaces of the inlet and outlet seats are provided with threaded holes for installing heat sinks, the inner cavities of the inlet and outlet seats are provided with T-slots for installing watch strap contacts, and the end faces of the inlet and outlet seats are provided with polytetrafluoro rings for guiding.

[0017] Preferably, a guide rail made of stainless steel is installed in the inner cavity of the inlet seat along the length direction of the tube, and a slide structure is slidably arranged on the guide rail;

[0018] The moving contact body is configured as a tube, the inner cavity of the moving contact body is provided with a vertical plate, and a flange nut is fixed on the vertical plate; the inner cavity of the moving contact body is provided with a threaded column for fixing the slide structure.

[0019] Preferably, the slide structure includes an H-shaped slide block and flange bearings arranged on both sides of the H-shaped slide block for limiting movement on the guide rail.

[0020] The present invention provides a phase-changing switch for a large generator. Compared with the prior art, the present invention has the following advantages:

[0021] 1. One end of the guide rail of the present invention is set as a circular boss, and is used to insert into the vertical plate of the incoming wire seat for positioning and locked with two bolts. At this time, during the insertion of the moving contact, a polytetrafluoroethylene ring is set at the front end fillet of the moving contact, and the polytetrafluoroethylene ring can be used to guide the moving contact to be naturally centered.

[0022] 2. During normal operation, due to the large current, the electromagnetic field in the cylinder is dense and the eddy current effect is obvious. Therefore, the present invention can reduce eddy current heating by setting a screw lift, guide rail and slide structure made of stainless steel. At the same time, due to the poor ventilation effect in the cylinder and the low convection heat transfer coefficient, a plurality of ventilation holes are set at the vertical plate in the incoming wire seat and the moving contact cavity to increase convection and reduce temperature rise, thereby ensuring low temperature in the cylinder, improving the use effect of the switch and extending the service life of the switch.

[0023] 3. The isolating switch and the earthing switch of the present invention both adopt a single-contact plug-in structure with a visible break, which is convenient for observation and maintenance. The earthing switch is integrated on the isolating switch, and the two switches are integrated into one with a reasonable structure. The structure is novel, simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the device of the present invention;

[0026] Figure 2 is a cross-sectional schematic diagram of the main flow circuit assembly of the present invention;

[0027] Figure 3 for Figure 2 Magnified view at A in the middle;

[0028] Figure 4 It is an overall three-dimensional schematic diagram of the slide structure of the present invention;

[0029] Figure 5 It is a three-dimensional schematic diagram of the structural transmission of the present invention;

[0030] Figure 6 for Figure 5 Schematic diagram of the cross-section of the structure at point B.

[0031] In the figure:

[0032] 1. Small supporting insulator; 2. Grounding moving contact; 3. Motor; 4. Grounding soft flat wire; 5. Grounding screw rod lifter; 6. Manual anti-error mechanism; 7. Large supporting insulator; 8. Main current circuit assembly; 9. Insulating rod; 10. Base frame; 11. Right-angle commutator; 12. Spring contact finger; 13. Guide cylinder;

[0033] 801, isolation screw lifter; 802, incoming wire seat; 803, strap contact finger; 804, polytetrafluoroethylene ring; 805, pressure ring; 806, outgoing wire seat; 807, moving contact body; 808, slide structure; 809, guide rail;

[0034] 8081, H-type slider; 8082, flange bearing; 8083, retaining ring. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] In the embodiment, see Figures 1 to 6 .

[0037] like Figure 1 and Figure 2 As shown, the present invention provides a phase-changing switch for a large generator, which adopts a three-phase five-level structure, wherein one phase includes an isolating switch and two grounding switches arranged on a base frame 10, the isolating switch is arranged in the middle, and the grounding switches are arranged on both sides of the isolating switch break, and the isolating switch and the grounding switch are equipped with independent transmission systems, both of which are driven by motors and screw lifts, wherein:

[0038] The isolating switch includes a main current circuit assembly 8, which is installed on a base frame 10 through a large supporting insulator 7 and a small supporting insulator 1 respectively located at both ends. The main current circuit assembly 8 consists of an incoming line seat 802, a moving contact body 807 and an outgoing line seat 806, and the moving contact body 807 is connected to the incoming line seat 802 and the outgoing line seat 806 through strap contact fingers 803 arranged at both ends, and the wiring parts of the incoming line seat 802 and the outgoing line seat 806 both adopt a decagonal structure, which has a large carrying current, uniform current distribution, and good heat dissipation, and the outer surface thereof is processed with threaded holes for installing heat sinks.

[0039] At this time, the moving contact body 807 is installed coaxially with the incoming wire seat 802 and the outgoing wire seat 806.

[0040] Among them, both the isolating switch and the grounding switch adopt a single-contact plug-in structure with a visible break, which is convenient for observation and maintenance. At the same time, the grounding switch includes a grounding static contact integrated with the incoming seat 802 and the outgoing seat 806. Therefore, the grounding switch is integrated on the isolating switch, and the two switches are integrated into one with a reasonable structure. The structure is novel, simple and reliable.

[0041] Further, such as Figure 5 As shown, the phase-changing switch also includes a motor 3, a manually operated anti-error mechanism 6 and a T-shaped right-angle commutator 11. The right-angle commutator 11 is used to convert horizontal input into vertical output. The right-angle commutator 11 is vertically installed on the base frame 10, and the motor 3 and the manually operated anti-error mechanism 6 are respectively connected on both sides of the right-angle commutator 11. The right-angle commutator 11 is connected to an insulating rod 9 for supporting the phase-changing switch along the vertical output direction.

[0042] In a specific implementation process, the closing and opening of the isolating switch adopts horizontal movement, and at this time, when the moving contact body 807 moves horizontally, a visible break between the incoming line seat 802 and the outgoing line seat 806 can be achieved. Specifically, the isolating switch is horizontally driven by the motor 3, the manual anti-misoperation mechanism 6 and the isolating screw lift 801 on the main current circuit assembly 8, and the isolating screw lift 801 is installed in the inner cavity of the incoming line seat 802 and fixed by a vertical plate in the inner cavity.

[0043] When performing the isolation operation, the right-angle commutator 11 is driven by the motor 3 or manually rotated by the hand-operated anti-error mechanism 6. The right-angle commutator 11 converts the horizontal rotation into vertical rotation, which is transmitted to the isolation screw lift 801 through the insulating rod 9. The isolation screw lift 801 drives the horizontal sliding of the moving contact body 807 to achieve separation and connection.

[0044] In addition, further Figure 6 As shown, a grounding moving contact 2 is arranged at the bottom of the grounding static contact; a guide cylinder 13 is installed in the inner cavity of the grounding static contact, and a plurality of grooves for embedding spring contact fingers 12 are opened in the inner cavity of the grounding static contact, and the spring contact fingers 12 are in contact with the guide cylinder 13. The grounding switch contact finger arrangement here adopts the spring contact fingers 12, which can ensure that the grounding static contact has a strong resistance to dynamic thermal stability current.

[0045] Specifically, the spring contact finger 12 adopts a bevel coil spring, that is, the contact finger of each bevel coil spring is composed of multiple coils of bevel springs, and contacts with the grounding moving contact 2 when in the closed state. Due to the large number of contact points, the current allocated to each contact point is small, and the contact pressure is very small, and the contact resistance is small, which is suitable for carrying larger currents. The spring contact finger 12 is usually selected from chromium-zirconium copper, beryllium bronze or zirconium bronze. The selected material type is selected according to the mechanical life and the size of the carrying current.

[0046] Furthermore, in actual use, the number of spring contact fingers 12 generally needs to be configured according to the magnitude of the short-circuit current.

[0047] It can also be explained that the guide cylinder 13 is installed in the static contact cavity, and one end of the guide cylinder 13 is chamfered to facilitate the insertion and positioning of the grounding movable contact 2.

[0048] The lower end of the grounding moving contact 2 is provided with a grounding soft flat wire 4 and a grounding screw lift 5 in sequence. The grounding soft flat wire 4 is overlapped with the outer shell of the phase-changing switch, and a motor 3 for providing power is provided on one side of the grounding screw lift 5, and the other end is connected to a manually operated anti-error mechanism 6.

[0049] In a specific implementation process, the closing and opening of the grounding switch adopts upward and downward movement. Specifically, the grounding switch is vertically driven by the motor 3, the manual anti-error mechanism 6 and the grounding screw lifter 5.

[0050] When the grounding switch is operated to close or open, the grounding screw lift 5 is driven electrically by the motor 3 or manually by the hand-operated anti-error mechanism 6, and the up and down movement of the screw lift drives the moving contact body 807 to insert into the static contact of the grounding switch to achieve closing and opening.

[0051] The moving contact body 807 is connected to the incoming cable seat 802 and the outgoing cable seat 806 through the strap contact finger 803. The incoming cable seat 802 and the outgoing cable seat 806 are arranged as a tubular structure. The wiring parts of the incoming cable seat 802 and the outgoing cable seat 806 are arranged as a polygonal structure. The outer surfaces of the incoming cable seat 802 and the outgoing cable seat 806 are provided with threaded holes for installing heat sinks. The inner cavities of the incoming cable seat 802 and the outgoing cable seat 806 are provided with T-slots for installing the strap contact finger 803. The inner cavities of the incoming cable seat 802 and the outgoing cable seat 806 are installed with the strap contact finger 803 and guide parts. The moving contact body 807 is connected to the incoming cable seat 802 and the outgoing cable seat 806 through the strap contact finger 803.

[0052] Since the connection parts of the isolating switch inlet seat 802 and the outlet seat 806 adopt a decagonal structure and the main body adopts a tubular structure, the influence of the skin effect can be reduced. It has a large carrying current, uniform current distribution, and good heat dissipation. At the same time, the isolating switch contact finger structure adopts a strap contact finger 803, which has a large current carrying capacity and strong resistance to dynamic thermal stability.

[0053] At this time, in order to meet the mechanical life of about 20,000 plugging and unplugging times in the device structure, the surface treatment of the strap contact finger 803 and the moving contact body 807 is plated with hard silver or graphene, and the hardness can reach above HV120.

[0054] In addition, you can refer to Figure 3The end faces of the incoming cable seat 802 and the outgoing cable seat 806 are provided with a polytetrafluoro ring 804 in the guide part. The polytetrafluoro ring 804 is installed in the end grooves of the incoming cable seat 802 and the outgoing cable seat 806 and is pressed by a pressure plate. The guide part also includes a pressing ring 805, and the pressing ring 805 is used to limit and fix the polytetrafluoro ring 804. When the moving contact is inserted into the outgoing cable seat 806, the pressing ring 805 can cooperate with the polytetrafluoro ring 804 to play a role in guiding and centering.

[0055] Specifically, the moving contact body 807 has bevels and arcs at both ends, and due to the low friction of tetrafluoroethylene, when the moving contact body 807 slides horizontally for closing and opening, it can be guided and limited by the tetrafluoro ring 804 to ensure that the strap contact finger 803 is evenly pressed and the operation work is small.

[0056] Further, such as Figure 3 As shown, two sets of guide rails 809 made of stainless steel are installed in the inner cavity of the inlet seat 802 along the length direction of the tube, and a slide structure 808 is slidably arranged on the guide rails 809.

[0057] It can be explained here that in order to enable the moving contact body 807 to be horizontally and centeredly inserted into the outlet seat 806, the guide rail 809 is arranged in a mirror-symmetrical manner inside the incoming seat 802, and one end of the guide rail 809 is a circular boss, which is used to insert into the vertical plate of the incoming seat 802 for positioning and is locked with two bolts; in order to ensure the bending strength and precision of the guide rail 809, the guide rail 809 adopts a steel plate machine-added groove structure.

[0058] The moving contact body 807 is configured to be tubular, and has beveled and rounded corners at both ends to facilitate the insertion of the moving contact. A vertical plate is provided in the inner cavity of the moving contact body 807, and a flange nut is fixed on the vertical plate. Two sets of threaded columns for fixing the slide structure 808 are provided on the inner cavity of the moving contact body 807, and the lower end of the threaded column is used to install the slide structure 808. The slide structure 808 can slide horizontally on the guide rail 809 under the action of the screw rod.

[0059] The inner cavity of the inlet seat 802 is also provided with a vertical plate, one side of which is used to fix the isolation screw lift 801 of the isolating switch, and the other side is used to fix the guide rail 809. The flange nut of the isolation screw lift 801 is installed on the inner cavity vertical plate of the moving contact body 807; the moving contact body 807 relies on the guide rail 809 and the slide structure 808 installed on the inlet seat 802 to move horizontally;

[0060] Specifically, Figure 4As shown, the slide structure 808 is H-shaped as a whole, which specifically includes an H-shaped slider 8081 and flange bearings 8082 arranged on both sides of the H-shaped slider 8081. The flange bearing 8082 is provided with a retaining ring 8083 for limiting the movement of the H-shaped slider 8081 on the guide rail 809. The H-shaped slider 8081 is processed with a threaded hole for cooperating with the moving contact body 807.

[0061] Among them, a dovetail contact finger structure is arranged on the slide structure 808, wherein the inner circle single piece has two contact points, and the outer circle has four contact points. Each strap contact finger 803 is distributed with N pieces, thus forming a large number of point contacts, which can effectively overcome the current contraction force during dynamic stability.

[0062] In the specific implementation process, the flange bearing 8082 slides horizontally on the guide rail 809. At this time, in order to avoid the movable contact body 807 being inserted into the outlet seat 806 without being hard, the flange bearing 8082 and the guide rail 809 must be matched with a small gap.

[0063] Furthermore, since conventional linear modules have high precision and it is difficult to achieve natural centering of the moving contact, during the insertion of the moving contact body 807, the front end fillet of the moving contact body 807 can be naturally centered under the guidance of the Teflon ring 804, thereby improving the stability of the device operation.

[0064] It should also be noted that when the device is operating normally, due to the large current and dense electromagnetic field in the cylinder, the eddy current effect will be obvious. Therefore, the isolation screw lift 801, guide rail 809 and slide structure 808 arranged in the cylinder must be made of stainless steel, and the non-magnetic properties of stainless steel are used to reduce eddy current heating.

[0065] At the same time, due to the poor ventilation effect in the cylinder and the low convection heat transfer coefficient, the vertical plate in the inlet seat 802 and the moving contact body 807 cavity is provided with multiple ventilation holes to increase convection and reduce temperature rise.

[0066] In summary, the integrated isolating switch and earthing switch of the present application has the advantages of novel structural arrangement, simple and reliable transmission, convenient assembly, large current carrying capacity and strong resistance to electromotive force, and is particularly suitable for the frequent operation requirements of pumped storage power stations.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0068] In addition, it should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0069] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, in the embodiments of the present invention, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A phase-changing switch for a large generator, characterized in that: A three-phase five-level structure is adopted, wherein one phase comprises an isolating switch and two grounding switches arranged on a base frame (10), the isolating switch is arranged in the middle, and the grounding switches are arranged on both sides of the isolating switch break, wherein: The isolating switch comprises a main current-carrying circuit assembly (8), the main current-carrying circuit assembly (8) being mounted on a base frame (10) via a large supporting insulator (7) and a small supporting insulator (1) respectively located at two ends, the main current-carrying circuit assembly (8) being composed of an incoming wire seat (802), a moving contact body (807) and an outgoing wire seat (806), and the moving contact body (807) being connected to the incoming wire seat (802) and the outgoing wire seat (806) via strap contact fingers (803) arranged at two ends; The grounding switch comprises a grounding static contact integrated with an incoming line seat (802) and an outgoing line seat (806).

2. The phase-changing switch for a large generator according to claim 1, characterized in that: The phase-changing switch further comprises a motor (3), a manually operated anti-error mechanism (6) and a right-angle commutator (11) of a T-shaped structure. The right-angle commutator (11) is vertically mounted on a base frame (10), and the motor (3) and the manually operated anti-error mechanism (6) are respectively connected on both sides of the right-angle commutator (11). The right-angle commutator (11) is connected to an insulating rod (9) for supporting the phase-changing switch along a vertical output direction.

3. The phase-changing switch for a large generator as claimed in claim 2, characterized in that: The isolating switch is driven horizontally by a motor (3), a manually operated anti-error mechanism (6) and an isolating screw lifter (801) on a main current circuit assembly (8), and the isolating screw lifter (801) is installed inside the incoming line seat (802).

4. The phase-changing switch for a large generator as claimed in claim 3, characterized in that: A grounding moving contact (2) is arranged at the bottom of the grounding static contact; A guide cylinder (13) is installed in the inner cavity of the grounding static contact, and a plurality of grooves for embedding spring contact fingers (12) are provided in the inner cavity of the grounding static contact, and the spring contact fingers (12) are in contact with the guide cylinder (13); A grounding soft flat wire (4) and a grounding screw rod lifter (5) are sequentially arranged at the lower end of the grounding movable contact (2); the grounding soft flat wire (4) is overlapped with the outer shell of the phase-changing switch.

5. The phase-changing switch for a large generator as claimed in claim 4, characterized in that: The grounding switch is vertically driven by a motor (3), a manually operated anti-error mechanism (6) and a grounding screw lifter (5).

6. The phase-changing switch for a large generator according to claim 1, characterized in that: The inlet seat (802) and the outlet seat (806) are configured as tubular structures, the wiring parts of the inlet seat (802) and the outlet seat (806) are configured as polygonal structures, the outer surfaces of the inlet seat (802) and the outlet seat (806) are provided with threaded holes for installing heat sinks, the inner cavities of the inlet seat (802) and the outlet seat (806) are provided with T-slots for installing watch strap contacts (803), and the end faces of the inlet seat (802) and the outlet seat (806) are provided with polytetrafluoroethylene rings (804) for guiding.

7. The phase-changing switch for a large generator according to claim 1, characterized in that: A guide rail (809) made of stainless steel is installed in the inner cavity of the inlet seat (802) along the length direction of the tube, and a slide structure (808) is slidably arranged on the guide rail (809); The moving contact body (807) is configured to be tubular, the inner cavity of the moving contact body (807) is provided with a vertical plate, and a flange nut is fixed on the vertical plate; the inner cavity of the moving contact body (807) is provided with a threaded column for fixing the slide structure (808).

8. The phase-changing switch for a large generator according to claim 7, characterized in that: The slide structure (808) comprises an H-shaped slide block (8081) and flange bearings (8082) arranged on both sides of the H-shaped slide block (8081) for limiting movement on the guide rail (809).

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