A double-break disconnecting switch associated with a grounding switch and an operation and maintenance method

Abstract

The application provides a double-break isolation switch associated with a grounding switch and a maintenance method, and belongs to the technical field of high-voltage switch devices; comprising a basin insulator, an isolation static contact assembly, a shell, an isolation dynamic contact assembly, a dynamic side support frame, an insulating platform, a mechanism, an insulating transmission rod, a dynamic side transmission assembly, a grounding side dynamic contact assembly, a grounding static contact assembly and a cover plate; the isolation static contact assembly comprises a mounting seat, a spring, a contact finger piece, an arc contact and a shielding cover; the isolation dynamic contact assembly comprises a guide ring, a watchband contact finger and a dynamic contact; the dynamic side transmission assembly comprises a shaft pin, a connecting rod, a pull rod, a transmission support seat, a static side cross frame, a lead screw, an isolation dynamic nut and a dynamic side cross frame; the grounding side dynamic contact assembly comprises a grounding dynamic nut, a spring contact finger, a guide ring and a grounding dynamic contact; the application rigidly binds the movement track and working state of the isolation switch contact and the grounding switch contact through the unique mechanical interlocking transmission structure, realizes reverse synchronization and state forced interlocking of the two types of switches, and strictly ensures that the grounding switch always maintains a closed and locked state when the isolation switch is in an open working state.

Description

Technical Field

[0001] This invention provides a double-break disconnect switch that is linked to a grounding switch and a method for its operation and maintenance, belonging to the technical field of high-voltage switchgear. Background Technology

[0002] In the field of high-voltage electrical equipment, especially in gas-insulated metal-enclosed switchgear (GIS), disconnecting switches are almost always required to physically disconnect the primary transmission circuit after the circuit breaker trips. Currently, traditional disconnecting switches have only one break. Whether during busbar end bay expansion or after the installation of expanded equipment and subsequent withstand voltage tests, to prevent the entire busbar from being de-energized due to the disconnecting switch breaking down, and potentially even causing a power outage across the entire substation if the affected area is wide, traditional disconnecting switches can easily lead to a wider outage area during power grid operation and maintenance, significantly increasing maintenance costs.

[0003] Furthermore, most equipment manufacturers integrate the grounding switch unit into the disconnecting switch, reducing manufacturing costs and equipment footprint. However, since the grounding switch uses a separate operating mechanism, there is generally only electrical interlocking between the disconnecting and grounding switches, not mechanical interlocking. If, during operation, a signal error or manual operation of the grounding switch mechanism causes it to close, it will cause incalculable damage to the substation.

[0004] This invention addresses the technical shortcomings of existing high-voltage switchgear, such as the separate and independent installation of disconnecting switches and grounding switches, the lack of reliable mechanical interlocking, poor synchronization of operations, and the potential for safety hazards such as accidental opening or closing of grounding switches leading to live equipment maintenance, circuit short circuits, and electric shocks. Furthermore, the equipment is complex in structure, has high assembly and maintenance costs, and poor operational stability. This invention provides a double-break disconnecting switch that is linked to the grounding switch and its maintenance method.

[0005] Therefore, it is particularly important that the disconnecting switch can reliably disconnect the primary equipment circuit when in the open state, and also has the function of mechanical interlocking with the grounding switch. Summary of the Invention

[0006] This invention discloses a double-break disconnector switch linked to a grounding switch and its operation and maintenance method. Through an original mechanical interlocking transmission structure, the movement trajectory and working state of the disconnector switch contacts and the grounding switch contacts are rigidly linked and coordinated. This achieves reverse synchronization of the two types of switch actions and forced interlocking of states, strictly ensuring that when the disconnector switch is in the open working state, the grounding switch always remains in the closed locked state. In operation scenarios such as equipment maintenance and uninterrupted power supply expansion, after the disconnector switch reliably opens and completely cuts off the electrical connection between the equipment under test and the primary conductive main circuit, the grounding switch can stably maintain the closed grounding state, ensuring that the equipment under test is continuously and reliably grounded. From the mechanical structure level, this completely eliminates the risk of misoperation, significantly improves the safety of high-voltage equipment operation and maintenance, and the stability of equipment operation, while simplifying the overall equipment structure and reducing assembly and maintenance costs.

[0007] To address the aforementioned problems, the present invention proposes the following technical solution: a double-break disconnecting switch linked to a grounding switch, comprising a basin-type insulator, a stationary disconnecting contact assembly, a housing, a moving disconnecting contact assembly, a moving-side support frame, an insulating platform, a mechanism, an insulating transmission rod, a moving-side transmission assembly, a grounding-side moving contact assembly, a grounding stationary contact assembly, and a cover plate; the stationary disconnecting contact assembly includes a mounting base, a spring, contact fingers, an arc contact, and a shielding cover; the moving disconnecting contact assembly includes a guide ring, a watchband contact finger, and a moving contact; the moving-side transmission assembly includes a shaft pin, a connecting rod, a pull rod, a transmission support base, a stationary-side crossbeam, a lead screw, a moving disconnecting nut, and a moving-side crossbeam; the grounding-side moving contact assembly includes a grounding moving nut, a spring contact finger, a guide ring, and a grounding moving contact; the grounding stationary contact assembly includes a spring, a contact finger, a contact mounting base, and a shielding cover; the mechanism is mounted on the insulating platform. The output end of the mechanism is connected to an insulating transmission rod, which is fixedly connected to a lead screw. The lead screw is threaded with an isolating moving nut and a grounding moving nut. The isolating moving nut is fixedly connected to a moving side crossbeam, which is hinged to a tie rod via a pin. The tie rod is hinged to a connecting rod, which is connected to the moving contact of the isolating moving contact assembly. The moving contact is slidably mounted within the guide ring of the moving side support frame. The grounding moving nut is fixedly connected to the grounding moving contact, which is slidably mounted inside the guide ring. The isolating stationary contact is mounted inside the basin-type insulator, and a spring, contact finger, arc contact, and shielding cover are mounted on the mounting base of the isolating stationary contact assembly. The grounding stationary contact is mounted at the lower part of the housing, and a spring, contact finger, and shielding cover are mounted on the contact mounting base of the grounding stationary contact assembly. The cover plate is sealed at the bottom opening of the housing.

[0008] Furthermore, the rotation of the lead screw can drive the isolating moving nut and the grounding moving nut to move synchronously in a straight line along the axis of the lead screw; when the isolating moving nut and the grounding moving nut move towards the side closer to the mechanism, the moving side cross frame drives the pull rod and connecting rod transmission, causing the moving contact to extend out of the moving side support frame along the guide ring, and the moving contact contacts the arc contact and contact finger piece assembled with the isolating stationary contact, thereby realizing the closing of the isolating switch; at the same time, the grounding moving nut drives the grounding moving contact to move and disengage from the contact finger assembled with the grounding stationary contact, thereby realizing the opening of the grounding switch.

[0009] Furthermore, when the lead screw rotates in the reverse direction, the isolating moving nut and the grounding moving nut move synchronously along the lead screw axis to the side away from the mechanism; the moving side cross frame pulls the moving contact through the pull rod and connecting rod, causing the moving contact to retract into the moving side support frame, and the moving contact and the isolating stationary contact disconnect from each other, thus opening the isolating switch; at the same time, the grounding moving nut drives the grounding moving contact to move, and the grounding moving contact and the contact fingers assembled with the grounding stationary contact form effective contact, thus closing the grounding switch.

[0010] Furthermore, the disconnecting switch and the grounding switch share the same mechanism as the drive source; the mechanical interlocking transmission mechanism is composed of the lead screw, the disconnecting moving nut, the grounding moving nut, the connecting rod, and the pull rod; when the disconnecting switch is in the open position, the grounding switch is mechanically forced to remain in the closed position; when the disconnecting switch is in the closed position, the grounding switch is mechanically forced to remain in the open position.

[0011] Furthermore, the outer periphery of the moving contact of the isolating moving contact assembly is provided with a watchband contact finger; the outer periphery of the grounding moving contact of the grounding side assembly is provided with a spring contact finger.

[0012] Furthermore, the moving-side transmission assembly is also provided with a transmission support seat and a stationary-side crossbeam. The transmission support seat is fixedly installed inside the housing, the lead screw is rotatably supported on the transmission support seat, and the stationary-side crossbeam is fixedly connected to the transmission support seat.

[0013] A maintenance method for a double-break disconnector linked to a grounding switch, using the aforementioned double-break disconnector linked to a grounding switch, includes the following steps: S1, when equipment maintenance or uninterrupted power expansion work is to be performed, the mechanism receives an isolation tripping command, and the mechanism drives the insulating transmission rod to rotate the lead screw in the opposite direction; the lead screw drives the isolation moving nut and the grounding moving nut to move synchronously away from the mechanism; S2, the moving side crossbeam drives the pull rod and connecting rod, pulling the moving contact along the guide ring back into the moving side support frame; the arc contact and contact finger plates assembled with the moving contact and the isolation stationary contact separate, and the disconnector disconnects the equipment to be maintained from the main circuit; at the same time, the grounding moving nut drives the grounding moving contact. As the grounding moving contact moves along the guide ring, the contact fingers assembled with the grounding stationary contact reach the specified contact depth, the grounding switch closes, and the equipment under maintenance is reliably grounded; S3, after maintenance or uninterrupted expansion work is completed, the mechanism receives the isolation closing command, and the mechanism drives the insulating transmission rod to drive the lead screw to rotate in the forward direction; the isolation moving nut and the grounding moving nut move synchronously towards the mechanism; S4, the moving side crossbeam pushes the pull rod and connecting rod, causing the moving contact to extend out of the moving side support frame along the guide ring, and the moving contact contacts the arc contact and contact finger pieces assembled with the isolation stationary contact, and the isolation switch closes; simultaneously, the grounding moving contact and the contact fingers assembled with the grounding stationary contact disengage, the grounding switch opens, and the equipment returns to normal operation.

[0014] Due to the adoption of the above technical solution, the beneficial effects of the present invention, a double-break disconnecting switch linked with a grounding switch and its operation and maintenance method, are as follows: 1. This invention realizes the integrated design of disconnecting switch and grounding switch, sharing the same drive mechanism, abandoning the traditional split dual mechanism structure, greatly reducing the number of equipment parts, simplifying the assembly structure, reducing the overall size of the equipment, and effectively reducing the manufacturing, installation and maintenance costs of the equipment.

[0015] 2. This invention uses a mechanical interlocking transmission mechanism composed of a lead screw, double nuts, and connecting rods to achieve completely reverse synchronization of the actions of the disconnecting switch and the grounding switch, forming a mechanical forced interlock. This completely eliminates the risk of misoperation when the disconnecting switch and the grounding switch are closed at the same time, avoids safety accidents such as power grid short circuits and electric shocks from a structural perspective, and greatly improves the safety and reliability of equipment operation.

[0016] 3. The present invention has a moving contact with a dial indicator finger and a grounding moving contact with a spring finger, which can ensure tight contact and excellent conductivity, while also having good wear resistance and self-adaptive compensation capability, thereby improving the long-term stability of the equipment and extending its service life.

[0017] 4. This invention is equipped with a dedicated operation and maintenance method. The operation process is simple and standardized, and the opening and closing actions are synchronized and linked. There is no need to operate the two switches separately, which greatly simplifies the equipment operation and maintenance process, reduces the probability of human operation errors, and is suitable for various operation scenarios such as routine maintenance of high-voltage power grids and uninterrupted power supply expansion.

[0018] 5. The present invention has good overall sealing performance and high structural strength. The transmission support seat can stably support the rotation of the lead screw, ensuring transmission accuracy and structural stability under long-term frequent operation, and is suitable for various complex high-pressure operating conditions. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a diagram showing the disconnecting switch opening / grounding closing state of a double-break disconnecting switch linked with a grounding switch and its operation and maintenance method according to the present invention. Figure 2 This is an assembly diagram of the moving side components of a double-break disconnecting switch that is linked to a grounding switch and its operation and maintenance method according to the present invention. Figure 3 This is a diagram showing the closed / grounding trip state of a double-break disconnecting switch linked to a grounding switch and its operation and maintenance method according to the present invention. Figure 4 This is an assembly diagram of the stationary contact on the isolating side of the isolating switch in the invention of a double-break isolating switch linked to a grounding switch and an operation and maintenance method thereof; Figure 5 This is an assembly diagram of the stationary contact on the grounding side of the disconnecting switch in the present invention, which is a double-break disconnecting switch linked with a grounding switch and a method for operation and maintenance.

[0020] In the picture: 1. Basin-type insulator; 2. Isolating stationary contact assembly; 21. Mounting base; 22. Spring; 23. Contact finger; 24. Arc contact; 25. Shielding cover; 3. Housing; 4. Isolating moving contact assembly; 41. Guide ring; 42. Watchband contact finger; 43. Moving contact; 5. Moving side support frame; 6. Insulating platform; 7. Mechanism; 8. Insulating transmission rod; 9. Moving side transmission assembly; 91. Shaft pin; 92. Connecting rod; 93. 94. Pull rod; 95. Transmission support seat; 96. Stationary side crossbeam; 97. Lead screw; 98. Isolation moving nut; 199. Moving side crossbeam; 10. Grounding side moving contact assembly; 101. Grounding moving nut; 102. Spring contact finger; 103. Guide ring; 104. Grounding moving contact; 11. Grounding stationary contact assembly; 111. Spring; 112. Contact finger; 113. Contact mounting seat; 114. Shielding cover; 12. Cover plate. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides a double-break disconnecting switch linked to a grounding switch and its operation and maintenance method: It includes a basin-type insulator 1, a stationary disconnecting contact assembly 2, a housing 3, a moving disconnecting contact assembly 4, a moving-side support frame 5, an insulating platform 6, a mechanism 7, an insulating transmission rod 8, a moving-side transmission assembly 9, a grounding-side moving contact assembly 10, a grounding-side stationary contact assembly 11, and a cover plate 12; the stationary disconnecting contact assembly 2 includes a mounting base 21, a spring 22, contact fingers 23, an arc contact 24, and a shielding cover 25; the moving disconnecting contact assembly 4 includes a guide ring 41, a watchband contact... The moving contact 42 and the moving contact 43; the moving side transmission assembly 9 includes a shaft pin 91, a connecting rod 92, a pull rod 93, a transmission support seat 94, a stationary side crossbeam 95, a lead screw 96, an isolating moving nut 97, and a moving side crossbeam 98; the grounding side moving contact assembly 10 includes a grounding moving nut 101, a spring contact finger 102, a guide ring 103, and a grounding moving contact 104; the grounding stationary contact assembly 11 includes a spring 111, a contact finger 112, a contact mounting seat 113, and a shielding cover 114; the mechanism 7 is mounted on an insulating platform 6, and the transmission of the mechanism 7... The output end is connected to the insulating transmission rod 8, which is fixedly connected to the lead screw 96; the lead screw 96 is threaded with an isolation moving nut 97 and a grounding moving nut 101; the isolation moving nut 97 is fixedly connected to the moving side cross frame 98, which is hinged to the pull rod 93 via a shaft pin 91, and the pull rod 93 is hinged to the connecting rod 92, which is connected to the moving contact 43 of the isolation moving contact assembly 4; the moving contact 43 is slidably assembled in the guide ring 41 of the moving side support frame 5; the grounding moving nut 101 is connected to the grounding... The moving contact 104 is fixedly connected, and the grounding moving contact 104 is slidably assembled inside the guide ring 103; the isolating stationary contact assembly 2 is disposed inside the basin insulator 1, and the mounting base 21 of the isolating stationary contact assembly 2 is equipped with a spring 22, a contact finger 23, an arc contact 24 and a shield 25; the grounding stationary contact assembly 11 is disposed at the lower part of the housing 3, and the contact mounting base 113 of the grounding stationary contact assembly 11 is equipped with a spring 111, a contact finger 112 and a shield 114; the cover plate 12 is sealed and assembled at the bottom opening of the housing 3.

[0023] The rotation of the lead screw 96 drives the isolating moving nut 97 and the grounding moving nut 101 to move synchronously in a straight line along the axis of the lead screw 96. When the isolating moving nut 97 and the grounding moving nut 101 move towards the side closer to the mechanism 7, the moving side cross frame 98 drives the pull rod 93 and the connecting rod 92 to drive the moving contact 43 to extend out of the moving side support frame 5 along the guide ring 41. The moving contact 43 contacts the arc contact 24 and the contact finger 23 of the isolating stationary contact assembly 2, thereby closing the isolating switch. At the same time, the grounding moving nut 101 drives the grounding moving contact 104 to move and disengage from the contact finger 112 of the grounding stationary contact assembly 11, thereby opening the grounding switch.

[0024] When the lead screw 96 rotates in the reverse direction, the isolating moving nut 97 and the grounding moving nut 101 move synchronously along the axis of the lead screw 96 away from the mechanism 7. The moving side cross frame 98 pulls the moving contact 43 through the pull rod 93 and the connecting rod 92, so that the moving contact 43 retracts into the moving side support frame 5, and the moving contact 43 disconnects from the isolating stationary contact assembly 2, and the isolating switch is opened. At the same time, the grounding moving nut 101 drives the grounding moving contact 104 to move, and the grounding moving contact 104 forms effective contact with the contact finger 112 of the grounding stationary contact assembly 11, and the grounding switch is closed.

[0025] The disconnecting switch and the grounding switch share the same mechanism 7 as the driving source; the mechanical interlocking transmission mechanism is composed of the lead screw 96, the disconnecting moving nut 97, the grounding moving nut 101, the connecting rod 92 and the pull rod 93; when the disconnecting switch is in the open position, the grounding switch is mechanically forced to remain in the closed position; when the disconnecting switch is in the closed position, the grounding switch is mechanically forced to remain in the open position.

[0026] The moving contact 43 of the isolation moving contact assembly 4 is provided with a watch strap finger 42 on its outer periphery; the grounding moving contact 104 of the grounding side moving contact assembly 10 is provided with a spring finger 102 on its outer periphery.

[0027] The moving side transmission assembly 9 is also provided with a transmission support seat 94 and a stationary side crossbeam 95. The transmission support seat 94 is fixedly installed inside the housing 3, and the lead screw 96 is rotatably supported on the transmission support seat 94. The stationary side crossbeam 95 is fixedly connected to the transmission support seat 94.

[0028] A method for operating and maintaining a double-break disconnector that is linked to a grounding switch, using the aforementioned double-break disconnector linked to a grounding switch, includes the following steps: S1. When equipment maintenance or uninterrupted power expansion work is to be carried out, mechanism 7 receives the isolation trip command and mechanism 7 drives the insulating transmission rod 8 to rotate the screw 96 in the opposite direction; the screw 96 drives the isolation moving nut 97 and the grounding moving nut 101 to move synchronously away from mechanism 7. S2, the moving side crossbeam 98 drives the pull rod 93 and connecting rod 92, pulling the moving contact 43 along the guide ring 41 back into the moving side support frame 5; the moving contact 43 separates from the arc contact 24 and contact finger 23 of the isolating stationary contact assembly 2, and the isolating switch disconnects the equipment under maintenance from the main circuit; at the same time, the grounding moving nut 101 drives the grounding moving contact 104 to move along the guide ring 103, and the grounding moving contact 104 and the contact finger 112 of the grounding stationary contact assembly 11 reach the specified contact depth, the grounding switch closes, and the equipment under maintenance is reliably grounded; S3. After maintenance or uninterrupted power expansion work is completed, mechanism 7 receives the isolation closing command. Mechanism 7 drives the insulating transmission rod 8 to drive the lead screw 96 to rotate in the forward direction; the isolation moving nut 97 and the grounding moving nut 101 move synchronously towards mechanism 7. S4, the moving side crossbar 98 pushes the pull rod 93 and the connecting rod 92, causing the moving contact 43 to extend out of the moving side support frame 5 along the guide ring 41. The moving contact 43 contacts the arc contact 24 and contact finger 23 of the isolating stationary contact assembly 2, and the isolating switch closes. Simultaneously, the grounding moving contact 104 disengages from the contact finger 112 of the grounding stationary contact assembly 11, the grounding switch opens, and the equipment returns to normal operation.

[0029] The principle of the double-break disconnect switch linked with the grounding switch and the operation and maintenance method of the present invention is as follows: The process of isolating the circuit breaker from closing to opening / the process of grounding the circuit breaker from opening to closing is as follows: Figure 1 , Figure 2 As shown, after the system issues an isolation trip command signal, mechanism 7 drives the insulating transmission rod 8 and the lead screw 96 to rotate synchronously in the opposite direction to the aforementioned movement. The threads inside the isolation moving nut 97 and the grounding moving nut 101 will slide relative to each other along the threaded inclined surface on the lead screw, forcing the isolation moving nut 97 and the grounding moving nut 101 to move linearly away from the mechanism along the axis of the lead screw. The isolation moving nut 97 drives the moving side crossbeam 98 and the grounding moving nut 101 to move the grounding moving contact 104 away from the mechanism. At this time, the pull rod 93 is pulled away from the mechanism by the crossbeam 98, causing the angle between the moving side crossbeam 98 and the pull rod 93 to decrease and follow the crossbeam 98 to move away from the mechanism. At this time, the connecting rod 92 is pulled away from the moving contact 43 by the pull rod 93, causing the moving contact 43 to retract into the moving side support frame 5 along the direction specified by the guide ring 42. At the same time, the grounding moving contact 104 and the contact finger 112 begin to contact. Figure 3 As shown, after the moving contact 43 moves inside the support frame 5 along the specified direction of the guide ring 42, the moving contact 43 contacts the guide ring 41. At the same time, the grounding moving contact 104 moves along the specified direction of the guide ring 103 to the grounding stationary contact assembly 11. The grounding moving contact 104 and the contact finger 112 reach the specified contact depth, and the mechanism 7 stops moving, completing the isolation closing to opening process and the grounding opening to closing process.

[0030] This invention achieves a mechanical interlocking structure that binds the movement states of the disconnector switch contacts and the grounding switch contacts, ensuring that the grounding switch remains closed when the disconnector is open. This design aims to maximize the reliability of the equipment under test during maintenance and repair, ensuring that the disconnector switch reliably disconnects the equipment from the primary conductive circuit and guarantees the safety of maintenance personnel. Furthermore, by sharing a single mechanism between the disconnector and grounding switch, manufacturing costs are significantly reduced, equipment reliability is improved, and the failure of the grounding switch to close due to mechanical issues prevents potential safety hazards to maintenance personnel.

[0031] The present invention and its embodiments have been described above. This description is not restrictive. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A double-break disconnector switch linked to a grounding switch, characterized in that, The system includes a basin-type insulator (1), a stationary isolation contact assembly (2), a housing (3), a moving isolation contact assembly (4), a moving side support frame (5), an insulating platform (6), a mechanism (7), an insulating transmission rod (8), a moving side transmission assembly (9), a grounding side moving contact assembly (10), a grounding stationary contact assembly (11), and a cover plate (12); the stationary isolation contact assembly (2) includes a mounting base (21), a spring (22), contact fingers (23), an arc contact (24), and a shield (25); the moving isolation contact assembly (4) includes a guide ring (41), a strap contact finger (42), and a moving contact (43); the moving side transmission assembly ( 9) Includes a shaft pin (91), connecting rod (92), pull rod (93), transmission support seat (94), stationary side crossbeam (95), lead screw (96), isolation moving nut (97), and moving side crossbeam (98); the grounding side moving contact assembly (10) includes a grounding moving nut (101), spring contact finger (102), guide ring (103), and grounding moving contact (104); the grounding stationary contact assembly (11) includes a spring (111), contact finger (112), contact mounting seat (113), and shielding cover (114); the mechanism (7) is mounted on an insulating platform (6), and the output end of the mechanism (7) is connected to the insulating transmission rod (8). The transmission connection is as follows: the insulating transmission rod (8) is fixedly connected to the lead screw (96); the lead screw (96) is threaded with an isolation moving nut (97) and a grounding moving nut (101); the isolation moving nut (97) is fixedly connected to the moving side cross frame (98); the moving side cross frame (98) is hinged to the pull rod (93) through the shaft pin (91); the pull rod (93) is hinged to the connecting rod (92); the connecting rod (92) is connected to the moving contact (43) of the isolation moving contact assembly (4); the moving contact (43) is slidably assembled in the guide ring (41) of the moving side support frame (5); the grounding moving nut (101) and the grounding moving contact (101) are connected to the grounding moving contact (101). 04) Fixed connection, the grounding moving contact (104) is slidably assembled inside the guide ring (103); the isolation stationary contact assembly (2) is set inside the basin insulator (1), and the mounting base (21) of the isolation stationary contact assembly (2) is equipped with a spring (22), a contact finger (23), an arc contact (24) and a shield (25); the grounding stationary contact assembly (11) is set at the lower part of the housing (3), and the contact mounting base (113) of the grounding stationary contact assembly (11) is equipped with a spring (111), a contact finger (112) and a shield (114); the cover plate (12) is sealed and assembled at the bottom opening of the housing (3).

2. A double-break disconnector switch linked with a grounding switch according to claim 1, characterized in that, The rotation of the lead screw (96) can drive the isolating moving nut (97) and the grounding moving nut (101) to move synchronously in a straight line along the axis of the lead screw (96). When the isolating moving nut (97) and the grounding moving nut (101) move towards the side closer to the mechanism (7), the moving side cross frame (98) drives the pull rod (93) and the connecting rod (92) to drive the moving contact (43) to extend out of the moving side support frame (5) along the guide ring (41). The moving contact (43) contacts the arc contact (24) and the contact finger (23) of the isolating stationary contact assembly (2) to realize the closing of the isolating switch. At the same time, the grounding moving nut (101) drives the grounding moving contact (104) to move and disengage from the contact finger (112) of the grounding stationary contact assembly (11) to realize the opening of the grounding switch.

3. A double-break disconnecting switch linked with a grounding switch according to claim 2, characterized in that, When the lead screw (96) rotates in the reverse direction, the isolating moving nut (97) and the grounding moving nut (101) move synchronously away from the mechanism (7) along the axis of the lead screw (96); the moving side cross frame (98) pulls the moving contact (43) through the pull rod (93) and the connecting rod (92), so that the moving contact (43) retracts into the moving side support frame (5), the moving contact (43) disconnects from the isolating stationary contact assembly (2), and the isolating switch is opened; at the same time, the grounding moving nut (101) drives the grounding moving contact (104) to move, and the grounding moving contact (104) forms effective contact with the contact finger (112) of the grounding stationary contact assembly (11), and the grounding switch is closed.

4. A double-break disconnector switch linked with a grounding switch according to claim 3, characterized in that, The disconnecting switch and the grounding switch share the same mechanism (7) as the driving source; the mechanical interlocking transmission mechanism is composed of the lead screw (96), the disconnecting moving nut (97), the grounding moving nut (101), the connecting rod (92) and the pull rod (93); when the disconnecting switch is in the open position, the grounding switch is mechanically forced to remain in the closed position; when the disconnecting switch is in the closed position, the grounding switch is mechanically forced to remain in the open position.

5. A double-break disconnector switch linked with a grounding switch according to claim 1, characterized in that, The moving contact (43) of the isolation moving contact assembly (4) is provided with a watch strap finger (42) on the outer periphery; the grounding moving contact (104) of the grounding side moving contact assembly (10) is provided with a spring finger (102) on the outer periphery.

6. A double-break disconnector switch linked with a grounding switch according to claim 1, characterized in that, The moving side transmission assembly (9) is also provided with a transmission support seat (94) and a stationary side crossbeam (95). The transmission support seat (94) is fixedly installed inside the housing (3), and the lead screw (96) is rotatably supported on the transmission support seat (94). The stationary side crossbeam (95) is fixedly connected to the transmission support seat (94).

7. A method for operating and maintaining a double-break disconnector that is linked to a grounding switch, characterized in that, The application of the double-break disconnector linked to the grounding switch as described in any one of claims 1-6 includes the following steps: S1. When equipment maintenance or uninterrupted expansion work is to be carried out, the mechanism (7) receives the isolation trip command, and the mechanism (7) drives the insulating transmission rod (8) to drive the screw (96) to rotate in the opposite direction; the screw (96) drives the isolation moving nut (97) and the grounding moving nut (101) to move synchronously away from the mechanism (7); S2, the moving side cross frame (98) drives the pull rod (93) and connecting rod (92) to pull the moving contact (43) along the guide ring (41) back into the moving side support frame (5); the moving contact (43) separates from the arc contact (24) and contact finger (23) of the isolating stationary contact assembly (2), and the isolating switch disconnects the equipment under maintenance from the main circuit; at the same time, the grounding moving nut (101) drives the grounding moving contact (104) to move along the guide ring (103), and the grounding moving contact (104) and the contact finger (112) of the grounding stationary contact assembly (11) reach the specified contact depth, the grounding switch closes, and the equipment under maintenance is reliably grounded; S3. After the maintenance or uninterrupted expansion work is completed, the mechanism (7) receives the isolation closing command, and the mechanism (7) drives the insulating transmission rod (8) to drive the screw (96) to rotate in the forward direction; the isolation moving nut (97) and the grounding moving nut (101) move synchronously towards the mechanism (7); S4. The moving side crossbar (98) pushes the pull rod (93) and connecting rod (92), causing the moving contact (43) to extend out of the moving side support frame (5) along the guide ring (41). The moving contact (43) contacts the arc contact (24) and contact finger (23) of the isolating stationary contact assembly (2), and the isolating switch closes. Simultaneously, the grounding moving contact (104) disengages from the contact finger (112) of the grounding stationary contact assembly (11), the grounding switch opens, and the equipment returns to normal operation.

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