Phase-change switch for large generator

Abstract

The utility model discloses a phase-change switch for a large-scale 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 isolating switch and the grounding switch both adopt a single-contact plug-in type structure, have visible fractures and are convenient to observe and maintain, and the grounding switch is designed to be integrated on the isolating switch, so that the structure is novel, simple and reliable.

Description

TECHNICAL FIELD

[0001] The utility model relates to a technical field of commutating switch, concretely relates to a commutating switch for large generator. BACKGROUND

[0002] The disconnector and the grounding switch are used as the switch for maintenance, play the vital role in the high voltage switch industry in guaranteeing the personal safety and the equipment safety, and in the power system, the disconnector and the grounding switch technology are basically mature, but the product is single, the rated current and the short time resistance current are all very small, the biggest disconnector adopts the parallel mode of double knife gap and can only reach 10000A with difficulty, and the short time resistance current is 100kA.

[0003] At present, along with the increasing construction of pumped storage power station, and the capacity is rising, specifically, a 400MVA unit, the rated voltage 24kV commutating switch is equipped, and the rated current reaches 16000A, wherein the commutating switch plays an important role in the pumped storage power generation system, in order to meet the different use requirements of the phase sequence in the pumping direction and the power generation direction, the commutating switch needs to be combined and separated several times a day, so the mechanical life requirement is particularly strict, the standard requires M2 grade 10000 times of mechanical life, and now most of the pumped storage power stations require 20000 times, which far exceeds the standard requirement of the disconnector, and cannot meet the actual demand, and frequent maintenance and replacement are needed.

[0004] Therefore, the application provides a commutating switch for large generator to solve the above technical problems. CONTENT OF UTILITY MODEL

[0005] The main purpose of the utility model is to provide a commutating switch for large generator applied to pumped storage power station and convenient to observe and maintain.

[0006] The utility model solves the above technical problem by adopting the following technical scheme:

[0007] A kind of commutating switch for large generator, adopt three-phase five-grade structure, including one disconnector and two grounding switches arranged on the chassis in one phase, the disconnector is arranged in the middle, and the grounding switches are arranged on both sides of the disconnector break, wherein:

[0008] The disconnector includes a main current loop assembly, which is installed on the chassis by a large support insulator and a small support insulator respectively located at both ends, the main current loop assembly is composed of a wire inlet seat, a movable contact body and a wire outlet seat, and the movable contact body is connected with the wire inlet seat and the wire outlet seat by a watchband contact finger arranged at both ends;

[0009] The grounding switch includes a grounding static contact integrated with the wire inlet seat and the wire outlet seat.

[0010] Preferably, the phase change switch further comprises a motor, a hand-operated anti-misoperation mechanism and a T-shaped right-angle commutator, the right-angle commutator is vertically installed on the chassis, the motor and the hand-operated anti-misoperation mechanism are respectively connected to the two sides of the right-angle commutator, and the right-angle commutator is connected with an insulating rod for supporting the phase change switch in a vertical output direction.

[0011] Preferably, the isolating switch is horizontally driven by a motor, a hand-operated anti-misoperation mechanism and an isolating screw rod lifter on the main through-flow circuit assembly, and the isolating screw rod lifter is installed inside the incoming line seat.

[0012] Preferably, the grounding moving contact is arranged at the bottom of the grounding stationary contact.

[0013] A guide cylinder is installed in the inner cavity of the grounding stationary contact, a plurality of groups of recesses for inlaying spring contact fingers are formed in the inner cavity of the grounding stationary contact, and the spring contact fingers are in contact with the guide cylinder.

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

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

[0016] Preferably, the incoming line seat and the outgoing line seat are provided in a tubular structure, the wiring parts of the incoming line seat and the outgoing line seat are provided in a polygonal structure, the outer surfaces of the incoming line seat and the outgoing line seat are provided with threaded holes for mounting cooling fins, the inner cavities of the incoming line seat and the outgoing line seat are provided with T-shaped grooves for mounting watchband contact fingers, and the end faces of the incoming line seat and the outgoing line seat are provided with tetrafluoro rings for guiding.

[0017] Preferably, a guide rail made of stainless steel is installed in the inner cavity of the incoming line seat along the length direction of the cylinder, and a sliding table structure is slidably arranged on the guide rail.

[0018] The moving contact body is provided in a tubular structure, a vertical plate is arranged in the inner cavity of the moving contact body, and a flange nut is fixed on the vertical plate; and a threaded column for fixing the sliding table structure is arranged on the inner cavity of the moving contact body.

[0019] Preferably, the sliding table structure comprises an H-shaped sliding block and flange bearings arranged on the two sides of the H-shaped sliding block and movably arranged on the guide rail.

[0020] The utility model provides a kind of phase change switch for large generator.Compared with prior art, the beneficial effects of the utility model are embodied in:

[0021] 1.The utility model discloses a guide rail one end is set as round boss, and is positioned for inserting into the vertical plate of inlet seat, and locks with two bolts, at this moment in the process of inserting movable contact, through setting polytetrafluoroethylene ring in the front end round angle of movable contact, can guide with polytetrafluoroethylene ring, and let movable contact be in the center naturally.

[0022] 2.Due to normal operation, due to the current, electromagnetic field is dense in the cylinder, and eddy current effect is obvious, therefore, the utility model discloses setting up the screw rod elevator of stainless steel material, guide rail and sliding table structure, can reduce eddy current heat, and simultaneously due to the poor ventilation effect in the cylinder, the convection heat transfer coefficient is low, therefore, sets up multiple ventilation holes at the vertical plate in the inlet seat and movable contact cavity at this moment, can increase convection and reduce temperature rise, thereby guaranteeing low temperature in the cylinder, improving the use effect of the switch, prolonging the service life of the switch.

[0023] 3.The utility model discloses that the isolator and the grounding switch all adopt single contact plug-in structure, have visible fracture, convenient for observation and overhaul, and the grounding switch is integrated on the isolator and is designed, and two kinds of switches are integrated with reasonable structure, and the structure is novel, simple and reliable. ACCURACY OF DRAWINGS

[0024] The drawings accompanying the specification of this application form a part hereof, serve to provide further understanding of the present application, and together with the description of the present application, serve to explain the present application. In the drawings:

[0025] Figure 1 It is the whole three-dimensional schematic view of the device of the utility model;

[0026] Figure 2 It is the cross section schematic view of main through flow loop subassembly of the utility model;

[0027] Figure 3 It is Figure 2 The enlarged view of A in the middle;

[0028] Figure 4 It is the whole three-dimensional schematic view of sliding table structure of the utility model;

[0029] Figure 5 It is the structure transmission three-dimensional schematic view of the utility model;

[0030] Figure 6 It is Figure 5 The cross section schematic view of structure B in the middle.

[0031] In the drawings:

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

[0033] 801. Isolation screw jack; 802. Inlet connector; 803. Watch strap contact finger; 804. PTFE ring; 805. Pressure ring; 806. Outlet connector; 807. Moving contact body; 808. Slide structure; 809. Guide rail;

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

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0036] For details in the embodiments, please refer to Figures 1 to 6 .

[0037] like Figure 1 and Figure 2 As shown, this utility model provides a phase-switching switch for a large generator, adopting a three-phase five-pole structure. One phase includes a disconnecting switch and two grounding switches mounted on the base frame 10. The disconnecting switch is centrally located, and the grounding switches are located on either side of the disconnecting switch's contact point. Both the disconnecting switch and the grounding switches are equipped with independent transmission systems, both using a motor and a screw jack for drive.

[0038] The disconnecting switch includes a main current-carrying circuit assembly 8, which is mounted on a base frame 10 via large support insulators 7 and small support insulators 1 located at both ends. The main current-carrying circuit assembly 8 consists of an inlet socket 802, a moving contact body 807, and an outlet socket 806. The moving contact body 807 is connected to the inlet socket 802 and the outlet socket 806 via watch strap contact fingers 803 located at both ends. The wiring parts of the inlet socket 802 and the outlet socket 806 both adopt a decagonal structure, which can carry a large current, distribute the current evenly, and dissipate heat well. The outer surface of the inlet socket 802 and the outlet socket 806 are machined with threaded holes for installing heat sinks.

[0039] At this time, the moving contact body 807 is coaxially mounted with the inlet socket 802 and the outlet socket 806.

[0040] The isolating switch and the grounding switch are both single-contact plug-in structures, have visible breaking points, and are convenient for observation and maintenance. Meanwhile, the grounding switch includes grounding static contacts integrated with the incoming line seat 802 and the outgoing line seat 806, so that the grounding switch is designed to be integrated on the isolating switch, and the two switches are integrated in a reasonable structure, which is novel, simple and reliable.

[0041] Further, as shown in Figure 5 The phase-change switch further includes a motor 3, a hand-operated anti-misoperation mechanism 6 and a T-shaped right-angle commutator 11, the right-angle commutator 11 is used for converting horizontal input into vertical output, the right-angle commutator 11 is vertically installed on the base frame 10, and the right-angle commutator 11 is connected with the motor 3 and the hand-operated anti-misoperation mechanism 6 on two sides respectively, and the right-angle commutator 11 is connected with an insulating rod 9 used for supporting the phase-change switch along a vertical output direction.

[0042] In a specific implementation process, the closing and opening of the isolating switch adopts horizontal movement, and the visible breaking point between the incoming line seat 802 and the outgoing line seat 806 can be realized when the movable contact main body 807 moves horizontally. Specifically, the isolating switch is horizontally driven by the motor 3, the hand-operated anti-misoperation mechanism 6 and the isolation lead screw lifter 801 on the main current loop assembly 8, and the isolation lead screw lifter 801 is installed in the inner cavity of the incoming line seat 802 and is fixed by a vertical plate in the inner cavity.

[0043] Specifically, when the isolation operation is performed, the right-angle commutator 11 is driven by the motor 3 or manually rotated by the hand-operated anti-misoperation mechanism 6, the right-angle commutator 11 converts horizontal rotation into vertical rotation, and the vertical rotation is transmitted to the isolation lead screw lifter 801 through the insulating rod 9, and the horizontal sliding of the movable contact main body 807 is driven by the isolation lead screw lifter 801 to realize closing and opening.

[0044] In addition, further as shown in Figure 6 The grounding static contact is provided with a grounding movable contact 2 at the bottom, a guide cylinder 13 is installed in the inner cavity of the grounding static contact, a plurality of grooves for inlaying spring contact fingers 12 are formed in the inner cavity of the grounding static contact, and the spring contact fingers 12 are in contact with the guide cylinder 13. Here, the grounding switch contact finger is provided with the spring contact finger 12, which can ensure that the grounding static contact has strong anti-dynamic thermal stability current.

[0045] Specifically, the spring contact finger 12 adopts an inclined coil spring, that is, the contact finger of each inclined coil spring is composed of multiple inclined coil springs. In the closed state, the spring contact finger 12 is in contact with the grounding movable contact 2. Since there are many contact points, the current of each contact point is small, the contact pressure is small, the contact resistance is small, and it is suitable for carrying large current. The spring contact finger 12 usually selects chromium-zirconium-copper, beryllium-bronze or zirconium-bronze, and the type of selected material is selected according to the mechanical life and the size of the carrying current.

[0046] In addition, in actual use, the number of spring contact fingers 12 is generally configured according to the size of the short-circuit current.

[0047] It should be further pointed out that the guide cylinder 13 is installed in the static contact chamber, and one end of the guide cylinder 13 is chamfered to facilitate the insertion and positioning of the grounding moving contact 2.

[0048] The grounding moving contact 2 is provided with a grounding flat cable 4 and a grounding screw lifter 5 in sequence, the grounding flat cable 4 is overlapped with the external shell of the phase changer, and the grounding screw lifter 5 is provided with a power supply motor 3 on one side and a hand-operated anti-misoperation mechanism 6 on the other end.

[0049] In a specific implementation process, the closing and opening of the grounding switch is achieved by up and down movement, specifically, the grounding switch is driven vertically by the motor 3, the hand-operated anti-misoperation mechanism 6 and the grounding screw lifter 5.

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

[0051] The moving contact body 807 is connected with the incoming line seat 802 and the outgoing line seat 806 through the watchband contact finger 803, the incoming line seat 802 and the outgoing line seat 806 are provided in a pipe type structure, the wiring part of the incoming line seat 802 and the outgoing line seat 806 is provided in a polygonal structure, the outer surface of the incoming line seat 802 and the outgoing line seat 806 is provided with a threaded hole for mounting a cooling fin, and the inner cavity of the incoming line seat 802 and the outgoing line seat 806 is provided with a T-shaped groove for mounting the watchband contact finger 803, and the inner cavity of the incoming line seat 802 and the outgoing line seat 806 is provided with the watchband contact finger 803 and a guide part, wherein the moving contact body 807 is connected with the incoming line seat 802 and the outgoing line seat 806 through the watchband contact finger 803.

[0052] Since the wiring part of the incoming line seat 802 and the outgoing line seat 806 of the disconnector is provided in a decagonal structure, and the main body is provided in a pipe type structure, the influence of the skin effect can be reduced, the current carrying capacity is large, the current distribution is uniform, the heat dissipation is good, and the watchband contact finger 803 is adopted in the contact finger structure of the disconnector, the current carrying capacity is large, and the dynamic thermal stability current is strong.

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

[0054] In addition, reference can be made to Figure 3The end faces of the inlet seat 802 and the outlet seat 806 are provided with four fluorine rings 804 in the guide parts, the four fluorine rings 804 are installed in the end groove of the inlet seat 802 and the outlet seat 806 and are pressed by the pressing plate, the guide parts further include a pressing ring 805, and the pressing ring 805 is used for limiting and fixing the four fluorine rings 804. When the movable contact is inserted into the outlet seat 806, the pressing ring 805 can cooperate with the four fluorine rings 804 to play a role of guiding the centering.

[0055] Specifically, the movable contact body 807 is provided with an inclined angle and a circular arc at both ends. Since the four fluorine has low friction, the movable contact body 807 can be guided and limited by the four fluorine rings 804 when sliding horizontally to close and open, so as to ensure that the watch band contact fingers 803 are uniformly pressed and the operation power is small.

[0056] Further, as shown in Figure 3 The inner cavity of the inlet seat 802 is provided with two groups of guide rails 809 made of stainless steel along the barrel length direction, and the guide rails 809 are provided with a sliding table structure 808 slidingly arranged thereon.

[0057] It can be explained here that in order to enable the movable contact body 807 to be inserted into the outlet seat 806 horizontally and centrally, the guide rails 809 are mirror-symmetrically arranged in the inlet seat 802, and one end of the guide rail 809 is a circular boss for positioning on the vertical plate of the inlet seat 802 and is locked by two bolts. In order to ensure the bending strength and precision of the guide rail 809, the guide rail 809 adopts a steel plate machined groove structure.

[0058] The movable contact body 807 is provided in a tubular shape and is provided with an inclined angle and a circular angle at both ends, which is beneficial to the insertion of the movable contact. The inner cavity of the movable contact body 807 is provided with a vertical plate, and a flange nut is fixed on the vertical plate. The inner cavity of the movable contact body 807 is provided with two groups of threaded columns for fixing the sliding table structure 808, the lower end of the threaded column is used for installing the sliding table structure 808, and the sliding table structure 808 can slide horizontally on the guide rail 809 under the action of the force of the lead screw.

[0059] The inner cavity of the inlet seat 802 is also provided with a vertical plate, one side of the vertical plate is fixed with an isolation lead screw elevator 801 of an isolation switch, and the other side is used for fixing the guide rail 809. The flange nut of the isolation lead screw elevator 801 is installed on the inner cavity vertical plate of the movable contact body 807. The movable contact body 807 moves horizontally relying on the guide rail 809 and the sliding table structure 808 installed on the inlet seat 802.

[0060] Specifically, as shown in Figure 4As shown, the slide structure 808 as a whole adopts an H type, which specifically comprises an H-shaped slide 8081 and flange bearings 8082 arranged on both sides of the H-shaped slide 8081, and a retaining ring 8083 is arranged on the flange bearing 8082 to limit the movement of the H-shaped slide 8081 on the guide rail 809, and a threaded hole is processed on the H-shaped slide 8081 to cooperate with the movable contact body 807.

[0061] The slide structure 808 is provided with a dovetail contact finger structure, the inner ring has two contact points, the outer ring has four contact points, and each watchband contact finger 803 is distributed by N pieces, so that a plurality of point contacts are formed, and the current contraction force during dynamic stabilization can be well overcome.

[0062] In the specific implementation process, the flange bearing 8082 slides horizontally on the guide rail 809, at this time, in order to avoid hard pressing when the movable contact body 807 is inserted into the outlet seat 806, the flange bearing 8082 and the guide rail 809 must be matched with a small gap.

[0063] In addition, since the conventional linear module is difficult to achieve natural centering of the movable contact due to high precision, the front end of the movable contact body 807 can be naturally centered under the guidance of the four-fluorine ring 804 during the insertion process, thereby improving the stability of the device operation.

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

[0065] In addition, due to the poor ventilation effect and low convection heat transfer coefficient in the cylinder, the vertical plate in the cavity of the inlet seat 802 and the movable contact body 807 is provided with a plurality of ventilation holes to increase convection and reduce temperature rise.

[0066] In summary, the integrated isolation switch and grounding switch structure of the present application has the advantages of novel structure, simple and reliable transmission, easy assembly, large carrying current and strong anti-electric force, and is particularly suitable for the frequent operation requirements of pumped storage power stations.

[0067] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0068] In addition, it needs to be explained that if the embodiments of the present application 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 condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0069] In addition, if the embodiments of the present application involve the description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B scheme. In addition, in the embodiments of the present application, "multiple" means more than two. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

Claims

1. A commutating switch for a large generator, characterized in that, Adopt three-phase five-level structure, one phase includes one disconnecting switch and two grounding switches arranged on the chassis (10), the disconnecting switch is arranged in the middle, and the grounding switches are arranged on both sides of the disconnecting switch; The disconnecting switch comprises a main through circuit assembly (8) mounted on the chassis (10) through large support insulators (7) and small support insulators (1) at both ends respectively, the main through circuit assembly (8) is composed of an incoming line seat (802), a movable contact body (807) and an outgoing line seat (806), and the movable contact body (807) is connected with the incoming line seat (802) and the outgoing line seat (806) through watchband contact fingers (803) arranged at both ends; The grounding switch comprises a grounding static contact which is integrated with the incoming line seat (802) and the outgoing line seat (806).

2. The commutator switch for a large generator as claimed in claim 1, characterized by The phase changer further comprises a motor (3), a hand-operated anti-misoperation mechanism (6) and a T-shaped right-angle commutator (11), the right-angle commutator (11) is vertically mounted on the chassis (10), the motor (3) and the hand-operated anti-misoperation mechanism (6) are connected on both sides of the right-angle commutator (11) respectively, and the right-angle commutator (11) is connected with an insulating rod (9) for supporting the phase changer in a vertical output direction.

3. The commutator switch for a large generator as claimed in claim 2, characterized by, The disconnecting switch is horizontally driven by the motor (3), the hand-operated anti-misoperation mechanism (6) and an isolation lead screw lifter (801) on the main through circuit assembly (8), and the isolation lead screw lifter (801) is mounted inside the incoming line seat (802).

4. The commutator switch for a large generator according to claim 3, characterized by The grounding static contact is provided with a grounding movable contact (2) at the bottom; A guide cylinder (13) is mounted in the inner cavity of the grounding static contact, a plurality of grooves for inlaying spring contact fingers (12) are formed 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 flexible flat wire (4) and a grounding lead screw lifter (5) are sequentially arranged at the lower end of the grounding movable contact (2), and the grounding flexible flat wire (4) is overlapped with the outer shell of the phase changer.

5. The commutator switch for a large electric generator according to claim 4, characterized by The grounding switch is vertically driven by the motor (3), the hand-operated anti-misoperation mechanism (6) and the grounding lead screw lifter (5).

6. The commutator switch for a large electric generator as claimed in claim 1, characterized by The incoming line seat (802) and the outgoing line seat (806) are provided in a pipe type structure, the wiring parts of the incoming line seat (802) and the outgoing line seat (806) are provided in a polygonal structure, the outer surfaces of the incoming line seat (802) and the outgoing line seat (806) are provided with threaded holes for mounting cooling fins, T-shaped grooves for mounting the watchband contact fingers (803) are formed in the inner cavities of the incoming line seat (802) and the outgoing line seat (806), and the end faces of the incoming line seat (802) and the outgoing line seat (806) are provided with polytetrafluoroethylene rings (804) for guiding.

7. The commutator switch for a large electric generator as claimed in claim 1, characterized by A guide rail (809) made of stainless steel is mounted in the inner cavity of the incoming line seat (802) along the length direction of the cylinder, and a sliding table structure (808) is slidably arranged on the guide rail (809); The moving contact body (807) is provided in a tube type, the inner cavity of the moving contact body (807) is provided with a vertical plate, and the 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 sliding table structure (808).

8. The commutator switch for a large electric generator as claimed in claim 7, characterized by The sliding table structure (808) comprises an H-shaped sliding block (8081) and flange bearings (8082) arranged on both sides of the H-shaped sliding block (8081) and used for limiting the movement of the flange bearings (8082) on the guide rail (809).

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