Operating device of three-position disconnecting switch

Abstract

The utility model belongs to the technical field of disconnecting switches, and particularly relates to an operating device of a three-position disconnecting switch, which comprises an electric operating mechanism, a manual operating mechanism and a chain wheel. The electric operating mechanism comprises a motor, a first gear set and a second gear set, the input end of the first gear set is connected with the output end of the motor, the output end of the first gear set is connected with the chain wheel, the second gear set is parallel to the first gear set, the second gear set is in transmission connection with the first gear set, and the second gear set comprises a second rotating shaft; a first cam and a second cam are arranged on the second rotating shaft in the axial direction of the second rotating shaft, two first microswitches are arranged in the circumferential direction of the first cam, and two travel switches are arranged in the circumferential direction of the second cam; the manual operation mechanism comprises an isolation input shaft and a grounding input shaft, a third gear is coaxially arranged on the isolation input shaft, a fourth gear is coaxially arranged on the grounding input shaft, the third gear and the fourth gear are meshed with each other, and the fourth gear is in transmission connection with the input end of the first gear set.

Description

Technical Field

[0001] The utility model belongs to the technical field of disconnectors, and particularly relates to an operating device for a three-position disconnector. Background Technique

[0002] The three-position disconnector is an important component in a gas-insulated switchgear (gas-filled cabinet), which plays the role of connecting, isolating, and grounding the primary circuit. The three-position disconnector integrates a grounding position on the traditional two-position disconnector. The three-position disconnector has three working positions, namely the closing position, the grounding position, and the intermediate isolation position. The three-position disconnector can be driven by a disconnector operating mechanism through a transmission member, and can be manually operated or electrically operated. During the operation process, the indicating disk on the mechanism is used to prompt the operator of the working position where the isolating knife is located, helping the operator to operate the isolating knife in place.

[0003] The existing disconnector operating mechanisms have the following defects: the structures of manual operation and electric operation are complex and large in volume; the manual operation is a single-hole operation, that is, the closing, opening, or grounding of the isolating knife is all operated through this one hole, and it is extremely easy to cause misoperation due to human reasons. How to simplify the disconnector operating mechanism and prevent misoperation is of great significance. Content of the Utility Model

[0004] In order to solve the problems of the complex structures of the manual operation and electric operation of the existing disconnector operating mechanism and the easy occurrence of misoperation, the utility model provides an operating device for a three-position disconnector.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows. An operating device for a three-position disconnector includes an electric operating mechanism, a manual operating mechanism, and a sprocket; the electric operating mechanism includes a motor, a first gear set, and a second gear set. The input end of the first gear set is connected to the output end of the motor, the output end of the first gear set is connected to the sprocket, the second gear set is arranged in parallel with the first gear set, the second gear set is in transmission connection with the first gear set, the second gear set includes a second rotating shaft, and a first cam and a second cam are arranged along the axial direction of the second rotating shaft. Two first microswitches are arranged along the circumferential direction of the first cam, and two travel switches are arranged along the circumferential direction of the second cam;

[0006] The manual operating mechanism includes an isolation input shaft and a grounding input shaft. A third gear is coaxially arranged on the isolation input shaft, a fourth gear is coaxially arranged on the grounding input shaft, the third gear and the fourth gear are meshed with each other, and the fourth gear is in transmission connection with the input end of the first gear set.

[0007] The electric operating mechanism further includes an auxiliary switch. A sector gear is provided at the output end of the second gear set, and a connecting rod is provided on the sector gear. The connecting rod is connected to the auxiliary contact of the auxiliary switch. The auxiliary switch, travel switch, and first microswitch are all electrical contacts. The second gear set and the first gear set have reliable transmission, a simple structure, and a compact layout. Driven by the second gear set, each electrical contact is cleverly triggered.

[0008] Preferably, the isolation input shaft has an isolation operating hole extending axially therethrough, and the grounding input shaft has a grounding operating hole extending axially therethrough, and the outer ends of both the isolation operating hole and the grounding operating hole have operating notches. A limit block is connected to the second gear set, and the limit block switches between the inner ends of the isolation operating hole and the inner ends of the grounding operating hole. When the limit block covers the inner end of the isolation operating hole, an external handle can pass through the isolation operating hole and then be blocked by the limit block, preventing the external handle from cooperating with the operating notch to drive the isolation input shaft to rotate. When the limit block covers the inner end of the grounding operating hole, the external handle can pass through the grounding operating hole and then be blocked by the limit block, preventing the external handle from cooperating with the operating notch to drive the grounding input shaft to rotate. The provision of the limit block prevents manual operation and effectively avoids misoperation.

[0009] Furthermore, the manual operating mechanism also includes a panel and a valve, the panel is penetrated by an isolation through hole, a grounding through hole and an operating slide groove, the isolation through hole is arranged opposite to the isolation operating hole, the grounding through hole is arranged opposite to the grounding operating hole, the valve is penetrated by a main operating hole, the valve is provided with a valve shift shaft, the valve is relatively slidably arranged on the inner side of the panel, the valve shift shaft passes through the operating slide groove and is exposed to the panel, the valve shift shaft is moved along the operating slide groove, and the valve shift shaft drives the valve to slide relative to the panel, so that the main operating hole switches between the outer end of the isolation operating hole and the outer end of the grounding operating hole. When the valve shift shaft is in the initial position, the main operating hole is located between the isolation operating hole and the grounding operating hole. At this time, the valve simultaneously covers the outer end of the isolation operating hole and the outer end of the grounding operating hole.

[0010] Furthermore, a first mounting plate is provided on the inner side of the valve, the isolation input shaft and the grounding input shaft are both provided on the first mounting plate, a first guide post is provided on the first mounting plate, and a first guide groove is provided on the valve to cooperate with the first guide post, thereby improving the reliability and stability of the valve sliding.

[0011] Further, the operating device of the three-position disconnector further includes a second microswitch and a second trigger bar. The second microswitch is disposed on the first mounting plate, and the second trigger bar is connected to the shutter. When the shutter dial shaft is in the initial position, the second microswitch is not triggered; when the shutter dial shaft drives the shutter to slide relative to the panel such that the main operation hole switches between the isolation operation hole and the grounding operation hole, the second trigger bar triggers the second microswitch, and at this time, the motor receives the signal from the second microswitch and does not start. The operating device of the three-position disconnector can perform both manual operation and electric operation. The second trigger bar triggers the second microswitch to make the motor receive a non-start signal, which gives priority to manual operation, especially when performing manual emergency operation, which is more important.

[0012] Further, when the isolation through-hole, the main operation hole, and the isolation operation hole are sequentially aligned, the external handle can sequentially pass through the isolation through-hole, the main operation hole, and the isolation operation hole, and cooperate with the operation notch to drive the isolation input shaft to rotate; when the grounding through-hole, the main operation hole, and the grounding operation hole are sequentially aligned, the external handle can sequentially pass through the grounding through-hole, the main operation hole, and the grounding operation hole, and cooperate with the operation notch to drive the isolation input shaft to rotate; after the rotation operation, the external handle is pulled out, and the shutter dial shaft is toggled along the operation chute to reset to the initial position. At this time, the shutter simultaneously covers the outer ends of the isolation operation hole and the grounding operation hole. Using an independent external handle to manually operate the operating device of the three-position disconnector further avoids manual misoperation.

[0013] Beneficial effects:

[0014] 1. The operating device of the three-position disconnector of the present invention can perform both electric operation and manual operation, and the electric operation and the manual operation are ingeniously integrated together, with a simple structure and a reasonable and compact layout;

[0015] 2. The operating device of the three-position disconnector of the present invention breaks through the existing single-hole manual operation. The present invention adopts double-hole manual operation and is provided with an anti-fooling structure composed of a shutter, a panel, etc., with excellent anti-fooling effect, ensuring that manual operation will not be misoperated;

[0016] 3. The operating device of the three-position disconnector of the present invention, when the shutter dial shaft is in the initial position, the second microswitch is not triggered, and the motor can be normally started according to requirements to achieve electric operation; when the shutter dial shaft drives the shutter to slide relative to the panel such that the main operation hole switches between the isolation operation hole and the grounding operation hole, the second trigger bar triggers the second microswitch, and at this time, the motor receives the non-start signal from the second microswitch, which gives priority to manual operation. When performing manual operation, it is ensured that the motor does not start, especially when performing manual emergency operation, which is more important;

[0017] 4. The operating device of the three-position disconnector of the present utility model has a clever and compact layout of the electric operating structure. Its second gear set and first gear set are reliably driven, and under the drive of the second gear set, it cleverly triggers the electrical contacts of the auxiliary switch, travel switch and first micro switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a three-dimensional structural schematic diagram of the operating device of the three-position disconnector of the present utility model;

[0020] Figure 2 is a front view schematic diagram of the operating device of the three-position disconnector of the present utility model;

[0021] Figure 3 is Figure 2 a cross-sectional view taken along the B-B direction in;

[0022] Figure 4 is a first exploded schematic diagram of the operating device of the three-position disconnector of the present utility model;

[0023] Figure 5 is a second exploded schematic diagram of the operating device of the three-position disconnector of the present utility model;

[0024] Figure 6 is a three-dimensional structural schematic diagram of the transmission part of the operating device of the three-position disconnector of the present utility model;

[0025] Figure 7 is Figure 6 a three-dimensional structural schematic diagram of the second perspective of;

[0026] Figure 8 is Figure 6 a three-dimensional structural schematic diagram of the third perspective of;

[0027] Figure 9 is Figure 6 a top view schematic diagram of, in which the electrical contacts are not shown;

[0028] In the figure: 1. Electric operating mechanism, 11. Motor, 12. First gear set, 13. Second gear set, 131. Second rotating shaft, 132. First cam, 133. Second cam, 134. Sector gear, 135. Connecting rod, 136. Limit block, 14. First microswitch, 15. Travel switch, 16. Auxiliary switch, 17. Second microswitch, 18. Second trigger bar, 2. Manual operating mechanism, 21. Isolation input shaft, 211. Isolation operation hole, 212. Operation notch, 22. Grounding input shaft, 221. Grounding operation hole, 23. Third gear, 24. Fourth gear, 25. Panel, 251. Isolation through hole, 252. Grounding through hole, 253. Operation chute, 26. Valve, 261. Main operation hole, 262. First guide groove, 27. Valve shifting shaft, 28. First mounting plate, 29. First guide post, 3. Sprocket wheel. Detailed implementation mode

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment:

[0031] As Figures 1 to 9As shown in the figure, an operating device for a three-position disconnecting switch includes an electric operating mechanism 1, a manual operating mechanism 2, and a sprocket 3. The electric operating mechanism 1 includes a motor 11, a first gear set 12, and a second gear set 13. The input end of the first gear set 12 is connected to the output end of the motor 11, and the output end of the first gear set 12 is connected to the sprocket 3. The sprocket 3 outputs to the isolating knife of the three-position disconnecting switch, causing the isolating knife to perform the movements of connection, isolation, and grounding. The second gear set 13 is arranged in parallel with the first gear set 12 and is in transmission connection with the first gear set 12. The second gear set 13 includes a second rotating shaft 131. Along the axial direction of the second rotating shaft 131, a first cam 132 and a second cam 133 are arranged. Along the circumferential direction of the first cam 132, two first micro switches 14 are arranged. Along the circumferential direction of the second cam 133, two travel switches 15 are arranged. The manual operating mechanism 2 includes an isolation input shaft 21 and a grounding input shaft 22. A third gear 23 is coaxially arranged on the isolation input shaft 21, and a fourth gear 24 is coaxially arranged on the grounding input shaft 22. The third gear 23 and the fourth gear 24 mesh with each other, and the fourth gear 24 is in transmission connection with the input end of the first gear set 12.

[0032] In this embodiment, the electric operating mechanism 1 further includes an auxiliary switch 16. A sector gear 134 is arranged at the output end of the second gear set 13. A connecting rod 135 is arranged on the sector gear 134, and the connecting rod 135 is connected to the auxiliary contact of the auxiliary switch 16. The auxiliary switch 16, the travel switch 15, and the first micro switch 14 in this embodiment are all electrical contacts, and each electrical contact is cleverly triggered under the drive of the second gear set 13.

[0033] In order to ensure anti-fooling during manual operation and effectively avoid manual misoperation, in this embodiment, as Figures 4 to 8 shown, an isolation operation hole 211 is axially penetrated through the isolation input shaft 21, and a grounding operation hole 221 is axially penetrated through the grounding input shaft 22. Both the outer ends of the isolation operation hole 211 and the grounding operation hole 221 have operation notches 212. A limit block 136 is connected to the second gear set 13, and the limit block 136 switches between the inner ends of the isolation operation hole 211 and the grounding operation hole 221. When the limit block 136 covers the inner end of the isolation operation hole 211, an external handle can pass through the isolation operation hole 211 and be blocked by the limit block 136, so that the external handle cannot cooperate with the operation notch 212 to drive the isolation input shaft 21 to rotate. When the limit block 136 covers the inner end of the grounding operation hole 221, an external handle can pass through the grounding operation hole 221 and be blocked by the limit block 136, so that the external handle cannot cooperate with the operation notch 212 to drive the grounding input shaft 22 to rotate.

[0034] Furthermore, in this embodiment, Figures 1 to 5 As shown, the manual operating mechanism 2 further includes a panel 25 and a valve 26. The panel 25 is penetrated by an isolation through-hole 251, a grounding through-hole 252 and an operating slide 253. The isolation through-hole 251 is arranged opposite to the isolation operating hole 211, and the grounding through-hole 252 is arranged opposite to the grounding operating hole 221. The valve 26 is penetrated by a main operating hole 261. The valve 26 is provided with a valve shift shaft 27. The valve 26 is relatively slidably arranged on the inner side of the panel 25. The valve shift shaft 27 passes through the operating slide 2 53 is exposed on the panel 25. The valve shift shaft 27 is moved along the operating slot 253. The valve shift shaft 27 drives the valve 26 to slide relative to the panel 25, causing the main operating hole 261 to switch between the outer end of the isolation operating hole 211 and the outer end of the grounding operating hole 221. When the valve shift shaft 27 is in the initial position, the main operating hole 261 is located between the isolation operating hole 211 and the grounding operating hole 221. At this time, the valve 26 simultaneously covers the outer ends of the isolation operating hole 211 and the grounding operating hole 221. Specifically, in this embodiment, a first mounting plate 28 is provided on the inner side of the valve 26. The isolation input shaft 21 and the grounding input shaft 22 are both mounted on the first mounting plate 28. The first mounting plate 28 is provided with a first guide post 29. The valve 26 is provided with a first guide slot 262 that cooperates with the first guide post 29 to improve the reliability and stability of the sliding of the valve 26.

[0035] Furthermore, in this embodiment, Figure 6 As shown, the operating device of the three-position isolating switch also includes a second microswitch 17 and a second trigger bar 18. The second microswitch 17 is disposed on the first mounting plate 28. The second trigger bar 18 is connected to the valve 26. When the valve shift shaft 27 is in the initial position, the second microswitch 17 is not triggered. When the valve shift shaft 27 drives the valve 26 to slide relative to the panel 25, causing the main operating hole 261 to switch between the isolation operating hole 211 and the grounding operating hole 221, the second trigger bar 18 triggers the second microswitch 17. At this time, the motor 11 receives a signal from the second microswitch 17 and does not start. The operating device of the three-position isolating switch can be operated manually or electrically. The second trigger bar 18 triggers the second microswitch 17 to cause the motor 11 to receive a deactivation signal, giving priority to manual operation, which is particularly important during manual emergency operation.

[0036] In this embodiment, if Figures 4 to 6As shown, when the isolation through-hole 251, the main operation hole 261, and the isolation operation hole 211 are opposite to each other in sequence, the external handle can pass through the isolation through-hole 251, the main operation hole 261, and the isolation operation hole 211 in sequence, and cooperate with the operation notch 212 to drive the isolation input shaft 21 to rotate; when the grounding through-hole 252, the main operation hole 261, and the grounding operation hole 221 are opposite to each other in sequence, the external handle can pass through the grounding through-hole 252, the main operation hole 261, and the grounding operation hole 221 in sequence, and cooperate with the operation notch 212 to drive the isolation input shaft 21 to rotate; after the rotation operation, the external handle is pulled out, and the valve flap shaft 27 is toggled along the operation chute 253 to reset to the initial position. At this time, the valve flap 26 simultaneously covers the outer ends of the isolation operation hole 211 and the grounding operation hole 221. Using an independent external handle to manually operate the operating device of the three-position disconnect switch can further avoid manual misoperation.

[0037] The working principle is as follows:

[0038] Electric operation:

[0039] During electric operation, the valve flap shaft 27 remains in the initial position. At this time, the valve flap 26 simultaneously covers the outer ends of the isolation operation hole 211 and the grounding operation hole 221, effectively avoiding manual misoperation during electric operation; and the second microswitch 17 is not triggered by the second trigger bar 18.

[0040] The motor 11 can be started. The motor 11 drives the first gear set 12 and the second gear set 13 in sequence. The first gear set 12 drives the sprocket 3 to rotate. The sprocket 3 outputs to the isolation knife of the three-position disconnect switch, so that the isolation knife performs the movements of connection, isolation, and grounding to achieve electric operation; at the same time, the second gear set 13 drives the first cam 132, the second cam 133, and the sector gear 134 to rotate. The forward and reverse rotations of the first cam 132 respectively trigger two first microswitches 14. The forward and reverse rotations of the second cam 133 respectively trigger two travel switches 15. The forward and reverse rotations of the sector gear 134 trigger the auxiliary switch 16 through the connecting rod 135. The auxiliary switch 16, the travel switch 15, and the first microswitch 14 are all electrical contacts, and each electrical contact is triggered skillfully under the drive of the second gear set 13.

[0041] Manual operation:

[0042] First, observe the position indication of the disconnect switch, etc., to determine whether manual operation is possible; under the condition of meeting the requirements for manual operation, then move the flap shaft 27 along the operation chute 253 to drive the flap 26 to slide relative to the panel 25. According to the actual operation requirements: when the isolation through hole 251, the main operation hole 261, and the isolation operation hole 211 are sequentially opposite, the external handle can sequentially pass through the isolation through hole 251, the main operation hole 261, and the isolation operation hole 211, and cooperate with the operation notch 212 to drive the isolation input shaft 21 to rotate. The isolation input shaft 21 drives the third gear 23, the fourth gear 24, the first gear set 12, and the sprocket 3 to rotate in sequence, realizing electric operation; when the grounding through hole 252, the main operation hole 261, and the grounding operation hole 221 are sequentially opposite, the external handle can sequentially pass through the grounding through hole 252, the main operation hole 261, and the grounding operation hole 221, and cooperate with the operation notch 212 to drive the grounding input shaft 22 to rotate. The grounding input shaft 22 drives the fourth gear 24, the first gear set 12, and the sprocket 3 to rotate in sequence, realizing electric operation; after the rotation operation, pull out the external handle, and move the flap shaft 27 along the operation chute 253 to reset it to the initial position. At this time, the flap 26 covers the outer ends of the isolation operation hole 211 and the grounding operation hole 221 again, effectively preventing accidental manual operation during electric operation.

[0043] During manual operation, when the flap shaft 27 drives the flap 26 to slide relative to the panel 25, the panel 25 drives the second trigger bar 18 to trigger the second microswitch 17. At this time, the motor 11 receives the non-start signal from the first microswitch 14, giving priority to manual operation and ensuring that the motor 11 does not start during manual operation. This is particularly important during manual emergency operation.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, should be covered within the protection scope of the present invention.

Claims

1. An operating device for a three-position disconnecting switch, characterized in that: It includes an electric operating mechanism (1), a manual operating mechanism (2) and a sprocket (3); the electric operating mechanism (1) includes a motor (11), a first gear set (12) and a second gear set (13). The input end of the first gear set (12) is connected to the output end of the motor (11), the output end of the first gear set (12) is connected to the sprocket (3), the second gear set (13) is arranged in parallel with the first gear set (12), the second gear set (13) is in transmission connection with the first gear set (12), the second gear set (13) includes a second rotating shaft (131), and a first cam (132) and a second cam (133) are arranged along the axial direction of the second rotating shaft (131). Two first micro switches (14) are arranged along the circumferential direction of the first cam (132), and two travel switches (15) are arranged along the circumferential direction of the second cam (133). The manual operating mechanism (2) includes an isolating input shaft (21) and a grounding input shaft (22). A third gear (23) is coaxially arranged on the isolating input shaft (21), a fourth gear (24) is coaxially arranged on the grounding input shaft (22), the third gear (23) and the fourth gear (24) are meshed with each other, and the fourth gear (24) is in transmission connection with the input end of the first gear set (12).

2. The operating device of the three-position disconnecting switch according to claim 1, characterized in that: The electric operating mechanism (1) further includes an auxiliary switch (16). A sector gear (134) is arranged at the output end of the second gear set (13), a connecting rod (135) is arranged on the sector gear (134), and the connecting rod (135) is connected to the auxiliary contact of the auxiliary switch (16).

3. The operating device of the three-position disconnecting switch according to claim 1 or 2, characterized in that: The isolating input shaft (21) axially penetrates through an isolating operation hole (211), the grounding input shaft (22) axially penetrates through a grounding operation hole (221), and operation notches (212) are formed at the outer ends of the isolating operation hole (211) and the grounding operation hole (221); a limiting block (136) is connected to the second gear set (13), and the limiting block (136) switches between the inner end of the isolating operation hole (211) and the inner end of the grounding operation hole (221). When the limiting block (136) covers the inner end of the isolating operation hole (211), an external handle can pass through the isolating operation hole (211) and then be blocked by the limiting block (136) so that the external handle cannot cooperate with the operation notch (212) to drive the isolating input shaft (21) to rotate; when the limiting block (136) covers the inner end of the grounding operation hole (221), the external handle can pass through the grounding operation hole (221) and then be blocked by the limiting block (136) so that the external handle cannot cooperate with the operation notch (212) to drive the grounding input shaft (22) to rotate.

4. The operating device of the three-position disconnector according to claim 3, characterized in that: The manual operating mechanism (2) further comprises a panel (25) and a valve (26); the panel (25) is penetrated by an isolation through hole (251), a grounding through hole (252) and an operating slide groove (253); the isolation through hole (251) is arranged opposite to the isolation operating hole (211); the grounding through hole (252) is arranged opposite to the grounding operating hole (221); the valve (26) is penetrated by a main operating hole (261); the valve (26) is provided with a valve shift shaft (27); the valve (26) is relatively slidably arranged on the inner side of the panel (25); the valve shift shaft (27) passes through the operating slide groove ( 253) is exposed on the panel (25), and the valve shift shaft (27) is shifted along the operating slot (253), and the valve shift shaft (27) drives the valve (26) to slide relative to the panel (25), so that the main operating hole (261) switches between the outer end of the isolation operating hole (211) and the outer end of the grounding operating hole (221). When the valve shift shaft (27) is at the initial position, the main operating hole (261) is located between the isolation operating hole (211) and the grounding operating hole (221), and at this time, the valve (26) simultaneously covers the outer end of the isolation operating hole (211) and the outer end of the grounding operating hole (221).

5. The operating device of the three-position disconnector according to claim 4, characterized in that: A first mounting plate (28) is provided on the inner side of the valve (26), the isolation input shaft (21) and the grounding input shaft (22) are both provided on the first mounting plate (28), a first guide column (29) is provided on the first mounting plate (28), and a first guide groove (262) is provided on the valve (26) to cooperate with the first guide column (29).

6. The operating device of the three-position disconnector according to claim 5, characterized in that: The operating device of the three-position isolating switch further comprises a second microswitch (17) and a second trigger bar (18), wherein the second microswitch (17) is arranged on the first mounting plate (28), and the second trigger bar (18) is connected to the valve (26). When the valve shift shaft (27) is located at the initial position, the second microswitch (17) is not triggered; when the valve shift shaft (27) drives the valve (26) to slide relative to the panel (25), so that the main operating hole (261) switches between the isolation operating hole (211) and the grounding operating hole (221), the second trigger bar (18) triggers the second microswitch (17), and at this time, the motor (11) does not start when receiving the signal from the second microswitch (17).

7. The operating device of the three-position disconnector according to claim 4, characterized in that: When the isolation through hole (251), the main operation hole (261), and the isolation operation hole (211) are sequentially aligned, the external handle can sequentially pass through the isolation through hole (251), the main operation hole (261), and the isolation operation hole (211), and cooperate with the operation notch (212) to drive the isolation input shaft (21) to rotate; when the grounding through hole (252), the main operation hole (261), and the grounding operation hole (221) are sequentially aligned, the external handle can sequentially pass through the grounding through hole (252), the main operation hole (261), and the grounding operation hole (221), and cooperate with the operation notch (212) to drive the isolation input shaft (21) to rotate; after the rotation operation, pull out the external handle, and move the valve shaft (27) along the operation chute (253) to reset to the initial position. At this time, the valve (26) simultaneously covers the outer ends of the isolation operation hole (211) and the grounding operation hole (221).

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