Novel mechanically latching high voltage switchgear on the generator side

Abstract

This invention belongs to the field of switchgear technology and discloses a novel mechanically interlocked high-voltage switchgear for the generator side. The novel mechanically interlocked high-voltage switchgear for the generator side includes a switchgear body, an operating unit, a rear panel, and a mechanical interlocking unit. When the grounding switch operating mechanism closes the incoming-side grounding switch via the grounding switch pull rod, the crank arm of the grounding switch operating mechanism rotates forward and sequentially acts on the first interlocking shaft via a straight fork and a push rod. The first interlocking shaft pushes backward, causing the irregularly shaped bent plate to rotate. The irregularly shaped bent plate drives the interlocking shaft to be pulled out from the interlocking plate on the rear panel, thus unlocking the rear panel. This invention ensures that the rear panel can only be opened when the incoming-side grounding switch is closed, improving operational safety and preventing safety accidents during maintenance.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and in particular to a novel mechanically interlocked high-voltage switchgear for the generator side. Background Technology

[0002] With the continuous optimization of the power investment structure, the scale of investment in power source and grid construction is enormous, and grid construction will experience rapid growth, generating huge market demand for power equipment. Among these, generator output switchgear belongs to the power generation output stage and is a special type of high-capacity power distribution equipment with a high DC component.

[0003] Traditional generator-side switchgear typically employs a simple structure to achieve its functions. The maintenance door on the rear panel of the cabinet primarily relies on an electrical interlocking system. However, this electrical interlocking method presents a significant safety hazard—when the electrical equipment is de-energized, the interlocking device is prone to malfunction, failing to reliably maintain the locked state, potentially allowing the maintenance door to be accidentally opened. In such situations, maintenance personnel are highly susceptible to electric shock due to misoperation or protective malfunction, leading to accidents and posing a significant threat to the personal safety of on-site workers. Summary of the Invention

[0004] The purpose of this invention is to provide a novel mechanically interlocked high-voltage switchgear for the generator side, which can improve safety during use and prevent safety accidents during maintenance.

[0005] To achieve this objective, the present invention adopts the following technical solution: A new type of mechanically interlocked high-voltage switchgear for the generator side includes: The switch cabinet contains an incoming-side grounding switch, a generator output circuit breaker, a disconnecting switch, and an outgoing-side grounding switch. One end of the overhead incoming line busbar is located outside the switch cabinet, and the other end of the overhead incoming line busbar passes through the switch cabinet via an overhead busbar bushing and is connected to the upper support of the generator output circuit breaker. The incoming-side grounding switch is connected to the overhead incoming line busbar via a grounding bar connector. The front end of the first horizontal busbar is connected to the lower support of the generator output circuit breaker, and the rear end of the first horizontal busbar extends to the rear of the cabinet via an internal busbar bushing and is connected to the lower end of a vertical lap joint. The upper end of the vertical lap joint is connected to the lower opening of the disconnecting switch, and the upper opening of the disconnecting switch is connected to the second horizontal busbar via an outgoing-side grounding switch. The lower end of the overhead busbar is connected to the second horizontal busbar, and the upper end of the overhead busbar extends to the outside of the switch cabinet via a busbar through-type current transformer. The operating unit includes a grounding switch operating mechanism, which operates the incoming line side grounding switch via a grounding switch lever; The rear panel is located at the rear end of the switch cabinet and has a locking plate. A support shaft is located inside the switch cabinet and a shaped bent plate is located on the support shaft. One end of the shaped bent plate has an interlocking shaft. Rotating the shaped bent plate can lock or unlock the interlocking shaft with the locking plate. The mechanical locking unit includes a first locking shaft, which is disposed inside the switch cabinet. The rear end of the first locking shaft is hinged to the other end of the irregularly shaped curved plate. A straight fork is provided on the crank arm of the ground knife operating mechanism, and a push rod is provided on the straight fork. The push rod is connected to the outer wall surface of the first locking shaft. Rotating the crank arm in the forward direction can move the first locking shaft backward, which is used to unlock the interlocking shaft from the locking plate.

[0006] As an optional solution for a novel mechanically interlocked high-voltage switchgear for the generator side, the crank arm is provided with an anti-rotation limiting part, the first interlocking shaft is hollow inside, and the mechanical interlocking unit further includes: The second locking shaft slides through the first locking shaft. A first spring is sleeved at the rear end of the second locking shaft. A first limiting pin is provided on the first locking shaft, and a second limiting pin is provided on the second locking shaft. The two ends of the first spring are respectively connected to the first limiting pin and the second limiting pin. A limiting sleeve is provided at the front end of the second locking shaft. The first locking shaft can drive the second locking shaft to move backward, so that the limiting sleeve abuts against the anti-rotation limiting part to prevent the crank arm from rotating in the opposite direction.

[0007] As an alternative to a novel mechanically interlocked high-voltage switchgear for the generator side, a notch is provided on the tube wall of the first interlocking shaft, and a locking top rod is provided at the rear end of the second interlocking shaft. The locking top rod extends out of the notch of the first interlocking shaft and abuts against the rear panel. Closing the rear panel can push the locking top rod forward. The limiting bushing separates from the anti-rotation limiting part to restore the degree of freedom of the crank arm to rotate in the opposite direction.

[0008] As an alternative to a new type of mechanically locked high-voltage switchgear for the generator side, a third limiting pin is provided on the second locking shaft, and a second spring is sleeved on the second locking shaft. The two ends of the second spring are respectively connected to the limiting shaft sleeve and the third limiting pin.

[0009] As an optional solution for a new type of mechanically interlocked high-voltage switchgear for the generator side, the switch cabinet is equipped with a horizontal support insulator, the upper end of which is connected to the first horizontal busbar.

[0010] As an optional solution for a new type of mechanically interlocked high-voltage switchgear for the generator side, the switch cabinet is equipped with an inverted insulator, the lower end of which is connected to the second horizontal busbar.

[0011] As an optional solution for a new type of mechanically interlocked high-voltage switchgear for the generator side, a lower lead is provided at the lower end of the overhead busbar. The lower lead is connected to the upper port of the high-voltage fuse, and the lower port of the high-voltage fuse is connected to the voltage transformer.

[0012] As an optional solution for a new type of mechanically interlocked high-voltage switchgear for the generator side, the switch cabinet is equipped with a supporting fuse insulator, which is connected to the high-voltage fuse.

[0013] As an optional solution for a new type of mechanically interlocked high-voltage switchgear for the generator side, the switch cabinet is equipped with a surge arrester, which is connected to the downlead via a connecting busbar.

[0014] As an optional solution for a new type of mechanically interlocked high-voltage switchgear for the generator side, the switch cabinet is equipped with lighting.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The novel mechanically interlocked generator-side high-voltage switchgear provided by this invention includes an incoming-side grounding switch, a generator-outlet circuit breaker, a disconnecting switch, and an outgoing-side grounding switch inside the switch cabinet. One end of the overhead incoming line busbar is located outside the switch cabinet, while the other end passes through an overhead busbar bushing inside the switch cabinet and is connected to the upper support of the generator-outlet circuit breaker. The incoming-side grounding switch is connected to the overhead busbar via a grounding switch connecting block. The front end of the first horizontal busbar is connected to the lower support of the generator-outlet circuit breaker, and the rear end of the first horizontal busbar extends through an internal busbar bushing to the rear of the cabinet and connects to the lower end of a vertical connecting block. The upper end of the vertical connecting block connects to the lower opening of the disconnecting switch, and the upper opening of the disconnecting switch connects to the second horizontal busbar via the outgoing-side grounding switch. The lower end of the overhead busbar connects to the second horizontal busbar, and the upper end of the overhead busbar extends outside the switch cabinet via a busbar through-type current transformer. The operating unit includes a grounding switch operating mechanism, which operates the incoming-side grounding switch via a grounding switch lever. The rear panel is located at the rear end of the switch cabinet and includes a locking plate. A support shaft is located inside the switch cabinet, and a shaped curved plate is mounted on the support shaft. One end of the shaped curved plate has an interlocking shaft; rotating the shaped curved plate allows the interlocking shaft to lock or unlock with the locking plate. The mechanical locking unit includes a first locking shaft located inside the switch cabinet. The rear end of the first locking shaft is hinged to the other end of the shaped curved plate. A straight fork is mounted on the crank arm of the floor knife operating mechanism, and a push rod is mounted on the straight fork. The push rod is connected to the outer wall of the first locking shaft. Forward rotation of the crank arm moves the first locking shaft backward, unlocking the interlocking shaft from the locking plate. Reverse rotation of the crank arm locks the interlocking shaft from the locking plate. When the grounding switch on the incoming line side is closed and grounded via the grounding switch lever, the crank arm of the grounding switch operating mechanism rotates clockwise. This rotation, through the straight fork and push rod, acts on the first locking shaft. The first locking shaft pushes backward, causing the irregularly shaped curved plate to rotate. The curved plate then pulls the interlocking shaft off the locking plate on the rear panel, unlocking the rear panel. This ensures that the rear panel can only be opened when the incoming line side grounding switch is closed and grounded. When the incoming line side grounding switch is open, the rear panel is locked, improving safety and preventing accidents during maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal assembly of the novel mechanically locked generator-side high-voltage switchgear in an embodiment of the present invention. Figure 2This is a side view of the cabinet when the grounding switch on the incoming line side is closed in an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 2 A magnified view of a section at point B in the middle; Figure 5 This is a rear view of the cabinet when the grounding switch on the incoming line side is closed in an embodiment of the present invention; Figure 6 This is a schematic diagram of the movement of the irregularly shaped bent plate when the grounding switch on the incoming line side is closed in an embodiment of the present invention; Figure 7 This is a side view of the cabinet when the grounding switch on the incoming line side is open in an embodiment of the present invention; Figure 8 for Figure 7 A magnified view of a section at point C; Figure 9 for Figure 7 A magnified view of a section at point D; Figure 10 This is a rear view of the cabinet when the grounding switch on the incoming line side is tripped in an embodiment of the present invention.

[0018] Figure label: 1. Switch cabinet; 2. Overhead incoming line busbar; 3. Overhead busbar bushing; 4. Generator output circuit breaker; 5. Incoming side grounding switch; 6. Grounding switch connection bar; 7. First horizontal busbar; 8. Internal busbar bushing; 9. Vertical lap joint; 10. Disconnecting switch; 11. Outgoing side grounding switch; 12. Second horizontal busbar; 13. Overhead busbar; 14. Busbar through-type instrument transformer; 15. Grounding switch operating mechanism; 151. Crank arm; 152. Straight fork; 153. Push rod; 154. Anti-rotation limit part; 16. Grounding switch pull rod; 17. Horizontal support insulator ; 18. Inverted insulator; 19. Lower lead-out bar; 20. High-voltage fuse; 21. Voltage transformer; 22. Supporting fuse tube insulator; 23. Surge arrester; 24. Connecting bar; 25. Lighting lamp; 26. Rear panel; 261. Locking plate; 27. Support shaft; 28. Irregularly shaped bent plate; 29. ​​Interlocking shaft; 30. First locking shaft; 301. Notch; 31. Second locking shaft; 32. First spring; 33. First limiting pin; 34. Second limiting pin; 35. Limiting bushing; 36. Locking top rod; 37. Third limiting pin; 38. Second spring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] To improve operational safety and prevent accidents during maintenance, this embodiment provides a novel mechanically interlocked high-voltage switchgear for the generator side. The following is a detailed description... Figures 1 to 10 The specific content of this embodiment will be described in detail.

[0024] The novel mechanically interlocked generator-side high-voltage switchgear provided in this embodiment includes a switch cabinet 1. Inside the switch cabinet 1 are an incoming-side grounding switch 5, a generator-outlet circuit breaker 4, a disconnecting switch 10, and an outgoing-side grounding switch 11. One end of the overhead incoming line busbar 2 is located outside the switch cabinet 1, and the other end of the overhead incoming line busbar 2 passes through an overhead busbar bushing 3 inside the switch cabinet 1 and is connected to the upper support of the generator-outlet circuit breaker 4. The incoming-side grounding switch 5 is connected to the overhead incoming line busbar 2 via a grounding bar connector 6. The front end of the first horizontal busbar 7 is connected to the lower support of the generator-outlet circuit breaker 4, and the rear end of the first horizontal busbar 7 extends to the rear of the cabinet via an internal busbar bushing 8 and connects to the lower end of the vertical connecting busbar 9. A horizontal support insulator 17 is installed inside the switch cabinet 1, and the upper end of the horizontal support insulator 17 is connected to the first horizontal busbar 7. The upper end of the vertical lap joint 9 is connected to the lower end of the disconnecting switch 10. The upper end of the disconnecting switch 10 is connected to the second horizontal busbar 12 via the outgoing side grounding switch 11. The lower end of the overhead busbar 13 is connected to the second horizontal busbar 12. An inverted insulator 18 is installed inside the switch cabinet 1, and its lower end is connected to the second horizontal busbar 12. The upper end of the overhead busbar 13 extends outside the switch cabinet 1 via a busbar-type current transformer 14. A lower lead-out bar 19 is installed at the lower end of the overhead busbar 13, connecting to the upper end of the high-voltage fuse 20. The lower end of the high-voltage fuse 20 is connected to the voltage transformer 21. A supporting fuse tube insulator 22 is installed inside the switch cabinet 1, connecting to the high-voltage fuse 20. A surge arrester 23 is installed inside the switch cabinet 1, connected to the lower lead-out bar 19 via a connecting strip 24. The switch cabinet 1 is equipped with an internal lighting lamp 25 to illuminate the interior of the cabinet. The rear panel 26 is located at the rear end of the switch cabinet 1.

[0025] When a power outage is required, the following steps should be taken in sequence: open generator outlet circuit breaker 4—open isolating switch 10—close outgoing side grounding switch 11—close incoming side grounding switch 5, and finally open rear panel 26 for safety maintenance. When a power restoration is required, the following steps should be taken in sequence: close rear panel 26—open incoming side grounding switch 5—open outgoing side grounding switch 11—close isolating switch 10—close generator outlet circuit breaker 4.

[0026] Furthermore, the novel mechanically interlocked high-voltage switchgear for the generator side provided in this embodiment also includes an operating unit and a mechanical interlocking unit. The operating unit includes a grounding switch operating mechanism 15, which operates the incoming-side grounding switch 5 via a grounding switch pull rod 16. A locking plate 261 is provided on the rear panel 26; a support shaft 27 is provided inside the switch cabinet 1, and a shaped bent plate 28 is provided on the support shaft 27. One end of the shaped bent plate 28 is provided with an interlocking shaft 29. Rotating the shaped bent plate 28 can lock or unlock the interlocking shaft 29 with the locking plate 261. The mechanical locking unit includes a first locking shaft 30, which is located inside the switch cabinet 1. The rear end of the first locking shaft 30 is hinged to the other end of the irregularly shaped curved plate 28. A straight fork 152 is provided on the crank arm 151 of the ground knife operating mechanism 15. A push rod 153 is provided on the straight fork 152. The push rod 153 is connected to the outer wall surface of the first locking shaft 30. Rotating the crank arm 151 in the forward direction can move the first locking shaft 30 backward. Rotating the crank arm 151 in the forward direction is used to unlock the interlocking shaft 29 and the locking plate 261.

[0027] When the new mechanically interlocked high-voltage switchgear on the generator side is in normal operation, the rear panel 26 is in the closed state, and the interlocking shaft 29 is locked to the locking plate 261. When the grounding switch 5 on the incoming line side is closed and grounded via the grounding switch lever 16, the crank arm 151 of the grounding switch 15 rotates forward and acts on the first locking shaft 30 sequentially via the straight fork 152 and the push rod 153. The first locking shaft 30 pushes backward, causing the irregularly shaped bent plate 28 to rotate. The irregularly shaped bent plate 28 drives the interlocking shaft 29 to be pulled off the locking plate 261 of the rear panel 26, thus unlocking the switch. This ensures that the rear panel can only be opened when the incoming line side grounding switch is closed and grounded; and that the incoming line side grounding switch is only open when the rear panel is closed and locked, improving operational safety and preventing accidents during maintenance.

[0028] Furthermore, the crank arm 151 is provided with an anti-rotation limiting part 154. The first locking shaft 30 is hollow and has a tubular structure. The mechanical locking unit also includes a second locking shaft 31, which slides through the first locking shaft 30. A first spring 32 is sleeved on the rear end of the second locking shaft 31. A first limiting pin 33 is provided on the first locking shaft 30, and a second limiting pin 34 is provided on the second locking shaft 31. The two ends of the first spring 32 are respectively connected to the first limiting pin 33 and the second limiting pin 34. A limiting sleeve 35 is provided at the front end of the second locking shaft 31. The first locking shaft 30 can drive the second locking shaft 31 to move backward, so that the limiting sleeve 35 abuts against the anti-rotation limiting part 154 to prevent the crank arm 151 from rotating in the opposite direction. When the grounding switch 5 on the incoming line side is closed and grounded by the grounding switch operating mechanism 15 through the grounding switch pull rod 16, the crank arm 151 of the grounding switch operating mechanism 15 rotates in the forward direction. During the process of the first locking shaft 30 moving backward, the first locking shaft 30 passes through the first limit pin 33, the first spring 32 and the second limit pin 34 in sequence and acts on the second locking shaft 31, causing the second locking shaft 31 to move backward at the same time. This causes the limit sleeve 35 to move to the lower end of the anti-rotation limit part 154 and prevent the crank arm 151 from rotating in the reverse direction, ensuring that the incoming line side grounding switch 5 cannot be tripped when the rear panel 26 is opened, so that the incoming line side grounding switch 5 is in a stable grounding state.

[0029] Furthermore, a notch 301 is provided on the tube wall of the first locking shaft 30, and a locking push rod 36 is provided at the rear end of the second locking shaft 31. The locking push rod 36 extends out of the notch 301 of the first locking shaft 30 and abuts against the rear panel 26. Closing the rear panel 26 can push the locking push rod 36 forward, and the limiting sleeve 35 separates from the anti-rotation limiting part 154 to restore the degree of freedom of the crank arm 151 to rotate in the reverse direction. This ensures that the crank arm 151 can only be unlocked and rotate in the reverse direction when the rear panel 26 is closed, at which time the incoming line side grounding switch 5 can be tripped.

[0030] Furthermore, in this embodiment, when the rear panel 26 is locked, the upper end of the locking rod 36 abuts against the rear panel 26. When the new mechanically locked generator-side high-voltage switchgear is in forward locking, and the first locking shaft 30 drives the second locking shaft 31 to move backward simultaneously, after the rear panel 26 is unlocked, the upper end of the locking rod 36 will extend backward a certain length from the cabinet. Due to the length of the locking rod 36 extending from the cabinet, when preparing to close the rear panel 26, the rear panel 26 can quickly contact the locking rod 36. As the rear panel 26 is closed, the locking rod 36 is pushed forward. In this embodiment, the rear panel 26 and the switchgear 1 are hinged together.

[0031] Furthermore, a third limiting pin 37 is provided on the second locking shaft 31, and a second spring 38 is sleeved on the second locking shaft 31. The two ends of the second spring 38 are respectively connected to the limiting sleeve 35 and the third limiting pin 37. When the second locking shaft 31 moves backward, the third limiting pin 37 and the second spring 38 act sequentially on the limiting sleeve 35, causing the limiting sleeve 35 to move to the position of the anti-rotation limiting part 154. When the second locking shaft 31 moves forward, the third limiting pin 37 and the second spring 38 act sequentially on the limiting sleeve 35, causing the limiting sleeve 35 to move away from the anti-rotation limiting part 154, allowing the crank arm 151 to regain the freedom of reverse rotation. When the crank arm 151 rotates in the reverse direction, the first locking shaft 30 moves forward, the interlocking shaft 29 is inserted into the U-shaped locking plate 261, and the incoming line side grounding switch 5 is tripped.

[0032] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A novel mechanically interlocked high-voltage switchgear for the generator side, characterized in that, include: The switch cabinet (1) is equipped with an incoming line grounding switch (5), a generator output circuit breaker (4), a disconnecting switch (10), and an outgoing line grounding switch (11). One end of the overhead incoming line busbar (2) is placed outside the switch cabinet (1), and the other end of the overhead incoming line busbar (2) is inserted into the switch cabinet (1) through an overhead busbar bushing (3) and connected to the upper bracket of the generator output circuit breaker (4). The incoming line grounding switch (5) is connected to the overhead incoming line busbar (2) through a grounding bar connector (6). The front end of the first horizontal busbar (7) is connected to the grounding bar (2). The lower bracket of the generator outlet circuit breaker (4) is connected, the rear end of the first horizontal busbar (7) extends to the rear of the cabinet through the busbar bushing (8) and is connected to the lower end of the vertical overlapping busbar (9), the upper end of the vertical overlapping busbar (9) is connected to the lower end of the disconnecting switch (10), the upper end of the disconnecting switch (10) is connected to the second horizontal busbar (12) through the outgoing side grounding switch (11), the lower end of the overhead busbar (13) is connected to the second horizontal busbar (12), and the upper end of the overhead busbar (13) extends to the outside of the switch cabinet (1) through the busbar through-core current transformer (14); The operating unit includes a grounding switch operating mechanism (15), which operates the incoming line side grounding switch (5) through a grounding switch lever (16); A rear panel (26) is provided at the rear end of the switch cabinet (1), and a locking plate (261) is provided on the rear panel (26); a support shaft (27) is provided inside the switch cabinet (1), and an irregularly shaped bent plate (28) is provided on the support shaft (27). One end of the irregularly shaped bent plate (28) is provided with a locking shaft (29). Rotating the irregularly shaped bent plate (28) can lock or unlock the locking shaft (29) and the locking plate (261); The mechanical locking unit includes a first locking shaft (30), which is disposed inside the switch cabinet (1). The rear end of the first locking shaft (30) is hinged to the other end of the irregular curved plate (28). A straight fork (152) is provided on the crank arm (151) of the ground knife operating mechanism (15). A push rod (153) is provided on the straight fork (152). The push rod (153) is connected to the outer wall surface of the first locking shaft (30). Rotating the crank arm (151) in the forward direction can cause the first locking shaft (30) to move backward, which is used to unlock the interlocking shaft (29) and the locking plate (261).

2. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 1, characterized in that, The crank arm (151) is provided with an anti-rotation limiting part (154), the first locking shaft (30) is hollow inside, and the mechanical locking unit further includes: The second locking shaft (31) slides through the inside of the first locking shaft (30). The rear end of the second locking shaft (31) is fitted with a first spring (32). The first locking shaft (30) is provided with a first limiting pin (33), and the second locking shaft (31) is provided with a second limiting pin (34). The two ends of the first spring (32) are respectively connected to the first limiting pin (33) and the second limiting pin (34). The front end of the second locking shaft (31) is provided with a limiting bushing (35). The first locking shaft (30) can drive the second locking shaft (31) to move backward, so that the limiting bushing (35) abuts against the anti-rotation limiting part (154) to prevent the crank arm (151) from rotating in the opposite direction.

3. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 2, characterized in that, The first locking shaft (30) has a notch (301) on its tube wall, and the second locking shaft (31) has a locking top rod (36) at its rear end. The locking top rod (36) extends out of the notch (301) of the first locking shaft (30) and abuts against the rear panel (26). Closing the rear panel (26) can push the locking top rod (36) forward. The limiting bushing (35) separates from the anti-rotation limiting part (154) to restore the degree of freedom of the crank arm (151) to rotate in the opposite direction.

4. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 3, characterized in that, The second locking shaft (31) is provided with a third limiting pin (37), and a second spring (38) is sleeved on the second locking shaft (31). The two ends of the second spring (38) are respectively connected to the limiting sleeve (35) and the third limiting pin (37).

5. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 1, characterized in that, The switch cabinet (1) is equipped with a horizontal support insulator (17), the upper end of which is connected to the first horizontal busbar (7).

6. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 1, characterized in that, The switch cabinet (1) is equipped with an inverted insulator (18), the lower end of which is connected to the second horizontal busbar (12).

7. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 1, characterized in that, The lower end of the overhead busbar (13) is provided with a lower lead-out (19), which is connected to the upper port of the high voltage fuse (20), and the lower port of the high voltage fuse (20) is connected to the voltage transformer (21).

8. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 7, characterized in that, The switch cabinet (1) is equipped with a supporting fuse tube insulator (22), which is connected to the high-voltage fuse (20).

9. The novel mechanically interlocked high-voltage switchgear for the generator side according to claim 7, characterized in that, The switch cabinet (1) is equipped with a surge arrester (23), which is connected to the downlead (19) via a connecting busbar (24).

10. The novel mechanically interlocked high-voltage switchgear for the generator side according to any one of claims 1-9, characterized in that, The switch cabinet (1) is equipped with a lighting lamp (25).

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