A neutral point safety measure device and method for a large hydro-generator set

Abstract

A neutral point safety measure device and method for a large hydro-turbine generator set, comprising a first isolating switch and a second isolating switch, both of which comprise an upper static pile head, a lower static pile head and a movable pile head, the movable pile head being located between the upper static pile head and the lower static pile head, a movable knife being rotatably mounted on the movable pile head, one end of a first conductor being electrically connected to the upper static pile heads of the first isolating switch and the second isolating switch, and the other end being electrically connected to the movable pile head of the second isolating switch, and the lower static pile heads of the first isolating switch and the second isolating switch being electrically connected to a grounding bar respectively. By operating the movable knives on the two isolating switches, three states and grounding instructions can be completed conveniently and quickly as required, eliminating the need for traditional manual ground wire hanging, as well as the procedures and processes for safety measures when hanging the ground wire, while avoiding safety accidents caused by misoperation.

Description

Technical Field

[0001] The invention relates to the technical field of water turbine generator maintenance, and in particular to a neutral point safety measure device and method for a large water turbine generator set. Background Art

[0002] When a single-phase grounding fault occurs in large and medium-sized generators, a large fault current will appear at the grounding fault point. If the current cannot be suppressed to a certain extent, it will directly damage the stator core. At the same time, a high overvoltage will appear on the healthy phase, which will seriously damage the insulation and even cause phase-to-phase short circuit, causing great harm. Therefore, large and medium-sized generators are equipped with a grounding device at their neutral point to reduce the above hazards. In practical applications, a set of isolating switches are usually provided between the neutral point of the generator and the grounding device. The neutral point is connected to the high-voltage side of the grounding device through the isolating switch, and the high-voltage side tail of the grounding device is directly grounded. When the generator is operating normally, the isolating switch is closed and the neutral point is grounded through the grounding device. When the generator is shut down and disconnected, the isolating switch is disconnected, and grounding wires need to be installed at the neutral point and the high-voltage side of the grounding device to complete the safety measures. When it is necessary to conduct preventive tests on the generator and the grounding device, the corresponding grounding wires need to be removed. The above are three actual working conditions often encountered in power plants. In the past few decades, power plants usually use single-phase, manual isolating switches, which are operated by manual operating mechanisms or insulating rods to achieve the two positions of the isolating switch opening and closing. During the maintenance period of the generator, it is required to rely on manpower to hang and remove the ground wire as a necessary safety measure when the equipment is running or disconnecting. It is time-consuming and laborious to carry out on-site, and there are operational safety risks. Summary of the invention

[0003] The technical problem to be solved by the present invention is: to solve the problems existing in the above-mentioned background technology, and to provide a neutral point safety measure device and method for a large hydro-turbine generator set. By operating the moving knives on the two disconnectors, the three states and grounding instructions can be completed conveniently and quickly as required, eliminating the traditional manual ground wire hanging, as well as the procedures and processes for taking safety measures when hanging the ground wire, while avoiding safety accidents caused by misoperation.

[0004] In order to realize the above-mentioned technical features, the purpose of the present invention is realized as follows: a neutral point safety measure device of a large-scale hydro-turbine generator set, which includes a first isolating switch and a second isolating switch, wherein the first isolating switch and the second isolating switch both include an upper static pile head, a lower static pile head and a movable pile head, the movable pile head is located between the upper static pile head and the lower static pile head, a movable knife is rotatably installed on the movable pile head, the movable knives on the first isolating switch and the second isolating switch rotate synchronously, and can be electrically connected to the upper static pile head or the lower static pile head respectively, one end of the first conductor is electrically connected to the upper static pile head of the first isolating switch and the second isolating switch, and the other end is electrically connected to the movable pile head of the second isolating switch, and the lower static pile heads of the first isolating switch and the second isolating switch are electrically connected to the grounding bar respectively; the upper static pile head of the first isolating switch or the second isolating switch is electrically connected to the neutral point of the generator, and the movable pile head of the first isolating switch is electrically connected to the grounding device.

[0005] The first isolating switch and the second isolating switch are installed side by side on the bracket, and the upper static pile head, the lower static pile head and the movable pile head are respectively installed and fixed to the bracket through the first insulator.

[0006] The bracket includes a transverse section and a longitudinal section, the upper static pile head is installed on the upper side of the longitudinal section, the lower static pile head is installed on the transverse section and away from the side of the longitudinal section, and the dynamic pile head is installed on the transverse section and close to the side of the longitudinal section.

[0007] A driving shaft is installed on the transverse section of the bracket and rotates between the lower static pile head and the dynamic pile head. Two first connecting rods are installed on the driving shaft. One end of the first connecting rod is fixedly connected to the driving shaft, and the other end is hinged to one end of the second connecting rod. The other end of the second connecting rod is hinged to the moving knife. The second connecting rod includes a second insulator and connecting rods respectively installed at both ends of the second insulator. The connecting rod at one end of the second insulator is hinged to the first connecting rod, and the connecting rod at the other end is hinged to the moving knife.

[0008] A driving device is installed on one side of the transverse section of the bracket, and the driving device is connected with the driving shaft for transmission.

[0009] The driving device includes a mounting seat, a reducer and a motor. One end of the mounting seat is mounted on one side of the transverse section of the bracket and is located outside the driving shaft. The other end of the mounting seat is mounted with a reducer. The power input end of the reducer is mounted with a motor. One end of the driving shaft is connected to the power output end of the reducer for transmission, and the output shaft of the motor is connected to the power input end of the reducer for transmission.

[0010] The driving device includes a mounting seat, a reducer and a manual device. One end of the mounting seat is mounted on one side of the transverse section of the bracket and is located outside the driving shaft. The other end of the mounting seat is mounted with a reducer. One end of the driving shaft is connected to the power output end of the reducer for transmission. The manual device includes a rotating rod and a handle. One end of the rotating rod is connected to the power input end of the reducer for transmission, and the other end is mounted with a handle.

[0011] The driving device includes a mounting seat, a reducer, a motor and a manual device. One end of the mounting seat is mounted on one side of the transverse section of the bracket and is located outside the driving shaft. The other end of the mounting seat is mounted with a reducer. The reducer has two power input ends. One of the power input ends of the reducer is mounted with a motor, and the other power input end is mounted with a manual device. One end of the driving shaft is connected to the power output end of the reducer for transmission; the output shaft of the motor is connected to one of the power input ends of the reducer for transmission. The manual device includes a rotating rod and a handle. One end of the rotating rod is connected to the other power input end of the reducer for transmission, and the other end is mounted with a handle.

[0012] The rotating rod of the manual device is connected to the other power input end of the reducer through a clutch; a support arm is installed on the transverse section, a bearing seat is installed on the support arm, one end of the rotating rod is connected to the clutch, and the other end is installed on the bearing seat, one end of the rotating rod located on the bearing seat extends out of the bearing seat, and a handle is installed on the end of the rotating rod extending out of the bearing seat.

[0013] The method of adopting the neutral point safety measure device of a large hydro-generator set is used for safety measure operations of the hydro-generator in three states:

[0014] Closing state: the working position when the generator is operating normally;

[0015] Rotate the movable knives on the first isolating switch and the second isolating switch, the movable knives on the first isolating switch and the second isolating switch are electrically connected to the upper static pile heads on the first isolating switch and the second isolating switch respectively, both movable knives are not grounded, and the first isolating switch electrically connects the neutral point of the generator to the high-voltage side of the grounding device;

[0016] Opening state: During generator maintenance, the neutral point of the generator is disconnected from the grounding device, and the neutral point of the generator and the grounding device are required to be grounded respectively;

[0017] The movable knives on the first isolating switch and the second isolating switch are rotated, and the movable knives on the first isolating switch and the second isolating switch are electrically connected to the lower static pile heads on the first isolating switch and the second isolating switch, respectively. Both movable knives are grounded, and the first isolating switch disconnects the neutral point of the generator from the high-voltage side of the grounding device; the first isolating switch directly connects the high-voltage side of the grounding device to the ground wire, and the second isolating switch grounds the neutral point of the generator;

[0018] Test status: After the generator has been overhauled, the workstation is conducting preventive tests;

[0019] The moving blades on the first isolating switch and the second isolating switch are not connected to the upper static pile head and the lower static pile head. The first isolating switch disconnects the neutral point of the generator from the grounding device, and the neutral point of the generator and the high-voltage side of the grounding device are not grounded.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention can conveniently and quickly complete the three states and grounding instructions as required by operating the moving knives on the two isolating switches, eliminating the traditional manual ground wire hanging and the procedures and processes of taking safety measures when hanging the ground wire, while avoiding safety accidents caused by misoperation.

[0022] 2. The present invention drives the first connecting rod to swing by rotating the driving shaft. When the first connecting rod swings, it pushes and pulls the second connecting rod. The second connecting rod drives the moving knife to rotate around the hinge point of the moving pile head, thereby realizing the connection between the moving knife and the upper static pile head or the lower static pile head.

[0023] 3. One end of the driving shaft of the present invention is connected to the power output end of the reducer for transmission, and the output shaft of the motor is connected to the power input end of the reducer for transmission. The device can be remotely controlled by operating the motor.

[0024] 4. One end of the drive shaft is connected to the power output end of the reducer for transmission, one end of the rotating rod is connected to the power input end of the reducer for transmission, and the other end is equipped with a handle to realize manual driving of the drive shaft to rotate.

[0025] 5. The present invention realizes both electric and manual operation by simultaneously providing a motor and a manual device, thereby realizing remote and local operation control. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0027] Figure 2 It is a side view structural schematic diagram of the present invention.

[0028] Figure 3 It is a schematic diagram of the top structure of the present invention.

[0029] Figure 4 It is a schematic diagram of the connection between the upper static pile head, the lower static pile head, the moving pile head and the insulator of the present invention.

[0030] Figure 5 It is a schematic diagram of the positions of the upper static pile head, the lower static pile head and the dynamic pile head of the present invention.

[0031] Figure 6 It is a circuit diagram of the present invention in the closed state.

[0032] Figure 7 It is a circuit diagram of the present invention in the open state.

[0033] Figure 8 It is a circuit diagram of the present invention in a test state.

[0034] In the figure: bracket 1, transverse section 11, longitudinal section 12, support arm 13, bearing seat 14, first disconnector 2, upper static pile head 21, first insulator 211, lower static pile head 22, movable pile head 23, movable knife 24, second disconnector 3, first conductor 4, drive shaft 5, first connecting rod 51, second connecting rod 52, second insulator 521, connecting rod 522, drive device 6, mounting seat 61, reducer 62, motor 63, rotating rod 64, clutch 65, handle 66, grounding bar 7. DETAILED DESCRIPTION

[0035] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] Embodiment 1:

[0037] See also Figure 1-8 A neutral point safety measure device for a large hydro-turbine generator set comprises a first isolating switch 2 and a second isolating switch 3, wherein the first isolating switch 2 and the second isolating switch 3 both comprise an upper static pile head 21, a lower static pile head 22 and a movable pile head 23, wherein the movable pile head 23 is located between the upper static pile head 21 and the lower static pile head 22, and a movable knife 24 is rotatably mounted on the movable pile head 23, wherein the movable knives 24 on the first isolating switch 2 and the second isolating switch 3 rotate synchronously and can be electrically connected to the upper static pile head 21 or the lower static pile head 22 respectively, wherein one end of a first conductor 4 is electrically connected to the upper static pile head 21 of the first isolating switch 2 and the second isolating switch 3, and the other end is electrically connected to the movable pile head 23 of the second isolating switch 3, and the lower static pile heads 22 of the first isolating switch 2 and the second isolating switch 3 are electrically connected to a grounding bar 7 respectively; the upper static pile head 21 of the first isolating switch 2 or the second isolating switch 3 is electrically connected to the neutral point of the generator, and the movable pile head 23 of the first isolating switch 2 is electrically connected to a grounding device. By operating the moving knives on the two isolating switches, the three states and grounding instructions can be completed quickly and easily as required, eliminating the traditional manual ground wire hanging and the procedures and processes for taking safety measures when hanging the ground wire, while avoiding safety accidents caused by misoperation.

[0038] See also Figure 1-3 The first isolating switch 2 and the second isolating switch 3 are installed side by side on the bracket 1, and the upper static pile head 21, the lower static pile head 22 and the movable pile head 23 are respectively installed and fixed to the bracket 1 through the first insulator 211. By providing the bracket 1, the overall installation of the first isolating switch 2 and the second isolating switch 3 is facilitated.

[0039] See also Figure 2 The bracket 1 includes a transverse section 11 and a longitudinal section 12, an upper static pile head 21 is installed on the upper side of the longitudinal section 12, a lower static pile head 22 is installed on the transverse section 11 and away from the side of the longitudinal section 12, and a movable pile head 23 is installed on the transverse section 11 and close to the side of the longitudinal section 12. With the above structure, the movable knife 24 only needs to rotate within a range of 90 degrees to connect with the upper static pile head 21 or the lower static pile head 22. In the preferred embodiment, see Figure 5 The transverse section 11 and the longitudinal section 12 are at an angle of 90°, and the upper static pile head 21, the lower static pile head 22 and the dynamic pile head 23 are arranged at an angle of 90°.

[0040] See also Figure 1 , 2 In order to conveniently drive the two moving knives 24 to rotate at the same time, a driving shaft 5 is installed on the transverse section 11 of the bracket 1 and rotates between the lower static pile head 22 and the moving pile head 23. Two first connecting rods 51 are installed on the driving shaft 5. One end of the first connecting rod 51 is fixedly connected to the driving shaft 5, and the other end is hinged to one end of the second connecting rod 52. The other end of the second connecting rod 52 is hinged to the moving knife 24. The second connecting rod 52 includes a second insulator 521 and connecting rods 522 respectively installed at both ends of the second insulator 521. The connecting rod 522 at one end of the second insulator 521 is hinged to the first connecting rod 51, and the connecting rod 522 at the other end is hinged to the moving knife 24. By rotating the driving shaft 5, the first connecting rod 51 is driven to swing. When the first connecting rod 51 swings, it pushes and pulls the second connecting rod 52. The second connecting rod 52 drives the moving knife 24 to rotate around the hinge point of the moving pile head 23, so that the moving knife 24 is connected to the upper static pile head 21 or the lower static pile head 22.

[0041] In order to facilitate the rotation of the driving shaft 5 , a driving device 6 is installed on one side of the transverse section 11 of the bracket 1 , and the driving device 6 is connected to the driving shaft 5 for transmission.

[0042] In the first approach, see Figure 3 The driving device 6 includes a mounting seat 61, a reducer 62 and a motor 63. One end of the mounting seat 61 is mounted on one side of the transverse section 11 of the bracket 1 and is located outside the driving shaft 5. The other end of the mounting seat 61 is mounted with the reducer 62. The power input end of the reducer 62 is mounted with the motor 63. One end of the driving shaft 5 is connected to the power output end of the reducer 62 for transmission. The output shaft of the motor 63 is connected to the power input end of the reducer 62 for transmission. Through the above structure, the device can be remotely controlled by operating the motor.

[0043] When in use, the motor 63 drives the reducer 62 to rotate, and the reducer 62 drives the drive shaft 5 to rotate, thereby simultaneously driving the two movable knives 24 to swing. Preferably, the motor 63 can be a stepper motor or a servo motor, which can accurately drive the swing angle of the movable knife 24. Of course, an ordinary motor can also be used, and a travel switch or a proximity switch is needed to control the swing angle of the movable knife 24.

[0044] In the second solution, the driving device 6 includes a mounting seat 61, a reducer 62 and a manual device. One end of the mounting seat 61 is mounted on one side of the transverse section 11 of the bracket 1 and is located outside the driving shaft 5. The other end of the mounting seat 61 is mounted with the reducer 62. One end of the driving shaft 5 is connected to the power output end of the reducer 62 for transmission. The manual device includes a rotating rod 64 and a handle 66. One end of the rotating rod 64 is connected to the power input end of the reducer 62 for transmission, and the other end is mounted with the handle 66. Through the above structure, the driving shaft 5 is driven to rotate manually.

[0045] When in use, the handle 66 is rotated to drive the rotating rod 64 to rotate, thereby driving the reducer 62 to rotate, thereby driving the driving shaft 5 to rotate.

[0046] In the third scheme, the driving device 6 includes a mounting seat 61, a reducer 62, a motor 63 and a manual device. One end of the mounting seat 61 is mounted on one side of the transverse section 11 of the bracket 1 and is located outside the driving shaft 5. The other end of the mounting seat 61 is mounted with a reducer 62. The reducer 62 has two power input ends. One of the power input ends of the reducer 62 is mounted with a motor 63, and the other power input end is mounted with a manual device. One end of the driving shaft 5 is connected to the power output end of the reducer 62 for transmission; the output shaft of the motor 63 is connected to one of the power input ends of the reducer 62 for transmission. The manual device includes a rotating rod 64 and a handle 66. One end of the rotating rod 64 is connected to the other power input end of the reducer 62 for transmission, and the other end is mounted with a handle 66. Through the above structure, both electric and manual operation modes are realized, and remote and local operation control is realized.

[0047] In a preferred solution, the reducer 62 is a worm gear reducer.

[0048] Furthermore, in order to prevent the electric and manual operations from occurring at the same time, the rotating rod 64 of the manual device is connected to the other power input end of the reducer 62 via a clutch 65. When the motor 63 is powered on, the clutch 65 is automatically disconnected. Preferably, the clutch 65 is a YCSM micro clutch.

[0049] Furthermore, when the clutch is used, in order to ensure the stability of the rotating rod 64, a support arm 13 is installed on the transverse section 11, and a bearing seat 14 is installed on the support arm 13. One end of the rotating rod 64 is connected to the clutch 65, and the other end is installed on the bearing seat 14. One end of the rotating rod 64 located at the bearing seat 14 extends out of the bearing seat 14, and a handle 66 is installed at the end of the rotating rod 64 extending out of the bearing seat 14. The rotating rod 64 is supported by the bearing seat 14.

[0050] Embodiment 2:

[0051] The method of adopting the neutral point safety measure device of a large-scale hydro-generator set is used for safety measure operations in three states of the hydro-generator.

[0052] See also Figure 6 , Closing state: the working position when the generator is operating normally.

[0053] Specifically, the movable knives 24 on the first isolating switch 2 and the second isolating switch 3 are rotated, and the movable knives 24 on the first isolating switch 2 and the second isolating switch 3 are electrically connected to the upper static pile heads 21 on the first isolating switch 2 and the second isolating switch 3, respectively. Both movable knives 24 are not grounded, and the first isolating switch 2 electrically connects the neutral point of the generator to the high-voltage side of the grounding device.

[0054]

[0055] See also Figure 7 , Disconnected state: The generator is under maintenance, the neutral point of the generator is disconnected from the grounding device, and the neutral point of the generator and the grounding device are required to be grounded separately.

[0056] Specifically, the movable blades 24 on the first isolating switch 2 and the second isolating switch 3 are rotated, and the movable blades 24 on the first isolating switch 2 and the second isolating switch 3 are electrically connected to the lower static pile heads 22 on the first isolating switch 2 and the second isolating switch 3, respectively. Both movable blades 24 are grounded, and the first isolating switch 2 disconnects the neutral point of the generator from the high-voltage side of the grounding device; the first isolating switch 2 directly connects the high-voltage side of the grounding device to the ground wire, and the second isolating switch 3 grounds the neutral point of the generator. This workstation can save the original manual operation of hanging the ground wire and taking safety measures.

[0057]

[0058] See also Figure 8 , Test status: The generator has been overhauled and is now in the workstation for preventive testing.

[0059] Specifically, the movable blades 24 on the first isolating switch 2 and the second isolating switch 3 are not connected to the upper static pile head 21 and the lower static pile head 22. The first isolating switch 2 disconnects the neutral point of the generator from the grounding device, and the neutral point of the generator and the high-voltage side of the grounding device are not grounded.

[0060]

[0061] Figure 6-8 In the device, the voltage level is 10-24kV, and there are two single-phase disconnectors K1 and K2, which are driven by a motor at the same time. K1 and K2 are each equipped with a moving pile head and two upper and lower static pile heads. K1 and K2 cooperate with each other, K1 completes the three-position switching, and K2 completes different grounding methods. For the convenience of wiring, the upper static pile heads of K1 and K2 are connected by a copper bar and connected to the neutral point of the generator. The other end of the copper bar is connected to the moving pile head of K2. The moving pile head of K1 is connected to the high-voltage side of the grounding device. The lower static pile heads of K1 and K2 are connected to the ground respectively.

Claims

1. A neutral point safety measure device for a large hydro-generator set, characterized by: It comprises a first isolating switch (2) and a second isolating switch (3), wherein the first isolating switch (2) and the second isolating switch (3) both comprise an upper static pile head (21), a lower static pile head (22) and a movable pile head (23), wherein the movable pile head (23) is located between the upper static pile head (21) and the lower static pile head (22), and a movable knife (24) is rotatably mounted on the movable pile head (23), and the movable knives (24) on the first isolating switch (2) and the second isolating switch (3) rotate synchronously and can respectively rotate with the upper static pile head (21) or the lower static pile head (22). ), one end of the first conductor (4) is electrically connected to the upper static pole head (21) of the first disconnector (2) and the second disconnector (3), and the other end is electrically connected to the movable pole head (23) of the second disconnector (3); the lower static pole heads (22) of the first disconnector (2) and the second disconnector (3) are electrically connected to the grounding bar (7) respectively; the upper static pole head (21) of the first disconnector (2) or the second disconnector (3) is electrically connected to the neutral point of the generator, and the movable pole head (23) of the first disconnector (2) is electrically connected to the grounding device.

2. A neutral point safety measure device for a large hydro-generator set according to claim 1, characterized in that: The first disconnector (2) and the second disconnector (3) are mounted side by side on a bracket (1); the upper static pile head (21), the lower static pile head (22) and the movable pile head (23) are respectively mounted and fixed to the bracket (1) via first insulators (211).

3. A neutral point safety measure device for a large hydro-generator set according to claim 2, characterized in that: The bracket (1) comprises a transverse section (11) and a longitudinal section (12), an upper static pile head (21) is mounted on the upper side of the longitudinal section (12), a lower static pile head (22) is mounted on the transverse section (11) and on a side away from the longitudinal section (12), and a movable pile head (23) is mounted on the transverse section (11) and on a side close to the longitudinal section (12).

4. A neutral point safety measure device for a large hydro-generator set according to claim 3, characterized in that: A drive shaft (5) is mounted on the transverse section (11) of the bracket (1) and is rotatably mounted between the lower static pile head (22) and the movable pile head (23). Two first connecting rods (51) are mounted on the drive shaft (5). One end of the first connecting rod (51) is fixedly connected to the drive shaft (5), and the other end is hinged to one end of a second connecting rod (52). The other end of the second connecting rod (52) is hinged to the movable blade (24). The second connecting rod (52) comprises a second insulator (521) and connecting rods (522) respectively mounted at both ends of the second insulator (521). The connecting rod (522) at one end of the second insulator (521) is hinged to the first connecting rod (51), and the connecting rod (522) at the other end is hinged to the movable blade (24).

5. A neutral point safety measure device for a large hydro-generator set according to claim 4, characterized in that: A driving device (6) is installed on one side of the transverse section (11) of the bracket (1), and the driving device (6) is connected to the driving shaft (5) for transmission.

6. A neutral point safety measure device for a large hydro-generator set according to claim 5, characterized in that: The driving device (6) comprises a mounting seat (61), a reducer (62) and a motor (63); one end of the mounting seat (61) is mounted on one side of the transverse section (11) of the bracket (1) and is located outside the driving shaft (5); the other end of the mounting seat (61) is mounted with the reducer (62); the power input end of the reducer (62) is mounted with the motor (63); one end of the driving shaft (5) is connected to the power output end of the reducer (62) for transmission; and the output shaft of the motor (63) is connected to the power input end of the reducer (62) for transmission.

7. A neutral point safety measure device for a large hydro-generator set according to claim 5, characterized in that: The driving device (6) comprises a mounting seat (61), a reducer (62) and a manual device. One end of the mounting seat (61) is mounted on one side of the transverse section (11) of the bracket (1) and is located outside the driving shaft (5). The other end of the mounting seat (61) is mounted with the reducer (62). One end of the driving shaft (5) is connected to the power output end of the reducer (62) for transmission. The manual device comprises a rotating rod (64) and a handle (66). One end of the rotating rod (64) is connected to the power input end of the reducer (62) for transmission, and the other end is mounted with the handle (66).

8. A neutral point safety measure device for a large hydro-generator set according to claim 5, characterized in that: The driving device (6) comprises a mounting seat (61), a reducer (62), a motor (63) and a manual device. One end of the mounting seat (61) is mounted on one side of the transverse section (11) of the bracket (1) and is located outside the driving shaft (5). The other end of the mounting seat (61) is mounted with a reducer (62). The reducer (62) has two power input ends. One of the power input ends of the reducer (62) is mounted with a motor (63), and the other power input end is mounted with a manual device. One end of the driving shaft (5) is connected to the power output end of the reducer (62) for transmission. The output shaft of the motor (63) is connected to one of the power input ends of the reducer (62) for transmission. The manual device comprises a rotating rod (64) and a handle (66). One end of the rotating rod (64) is connected to the other power input end of the reducer (62) for transmission, and the other end is mounted with a handle (66).

9. A neutral point safety measure device for a large hydro-generator set according to claim 8, characterized in that: The rotating rod (64) of the manual device is connected to the other power input end of the reducer (62) via a clutch (65); a support arm (13) is installed on the transverse section (11), and a bearing seat (14) is installed on the support arm (13); one end of the rotating rod (64) is connected to the clutch (65), and the other end is installed on the bearing seat (14); one end of the rotating rod (64) located on the bearing seat (14) extends out of the bearing seat (14), and a handle (66) is installed at the end of the rotating rod (64) extending out of the bearing seat (14).

10. A method of using a neutral point safety measure device of a large hydro-generator set as claimed in any one of claims 1 to 9 for safety measure operation of a hydro-generator set in three states, characterized in that: Closing state: the working position when the generator is operating normally; The movable knives (24) on the first isolating switch (2) and the second isolating switch (3) are rotated, the movable knives (24) on the first isolating switch (2) and the second isolating switch (3) are electrically connected to the upper static pile heads (21) on the first isolating switch (2) and the second isolating switch (3), respectively, the two movable knives (24) are not grounded, and the first isolating switch (2) electrically connects the neutral point of the generator to the high-voltage side of the grounding device; Opening state: During generator maintenance, the neutral point of the generator is disconnected from the grounding device, and the neutral point of the generator and the grounding device are required to be grounded respectively; The movable knives (24) on the first isolating switch (2) and the second isolating switch (3) are rotated, the movable knives (24) on the first isolating switch (2) and the second isolating switch (3) are electrically connected to the lower static pile heads (22) on the first isolating switch (2) and the second isolating switch (3), respectively, the two movable knives (24) are both grounded, the first isolating switch (2) disconnects the neutral point of the generator from the high-voltage side of the grounding device; the first isolating switch (2) directly connects the high-voltage side of the grounding device to the ground wire, and the second isolating switch (3) grounds the neutral point of the generator; Test status: After the generator has been overhauled, the workstation is conducting preventive tests; The movable blades (24) on the first isolating switch (2) and the second isolating switch (3) are not connected to the upper static pile head (21) and the lower static pile head (22); the first isolating switch (2) disconnects the neutral point of the generator from the grounding device; and the neutral point of the generator and the high-voltage side of the grounding device are not grounded.

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