A steam turbine overspeed protection control system and steam turbine

Abstract

The application discloses a steam turbine overspeed protection control system and a steam turbine, which comprises an adjusting device, an oil motor for controlling the opening degree of a regulating steam valve through a piston rod, a limiting device comprising a lock valve and a follow-up assembly, the follow-up assembly being rotatably arranged on the lock valve, one end of the follow-up assembly being arranged on a valve rod assembly in the lock valve, and the other end of the follow-up assembly being arranged above the oil motor along the axial direction of the piston rod, when the piston rod moves upward to abut against the follow-up assembly, the follow-up assembly presses the valve rod assembly to move downward, a fuel supply device, a pressure oil pipeline being in communication with a first port of a servo valve, a return oil pipeline being in communication with a second port of the servo valve, a third port of the servo valve being in communication with a lower chamber of the oil motor, a limiting oil pipeline being in communication with a unloading valve, a first port of the unloading valve being in communication with the pressure oil pipeline, a second port of the unloading valve being in communication with a first port of the lock valve through an additional pressure oil pipeline, and a second port of the lock valve being in communication with the lower chamber of the oil motor. The application can accurately adjust the speed-regulating steam valve to ensure the stability of the isolated network frequency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal power generation technology, and more particularly, to a steam turbine overspeed protection control system. In addition, the present application also relates to a steam turbine comprising the steam turbine overspeed protection control system. BACKGROUND

[0002] The steam turbine is a kind of rotary steam power device. High-temperature and high-pressure steam is injected into the blades after being accelerated by the nozzle, so as to rotate the rotor with the blade row, and at the same time, do work to the outside. It is the most widely used prime mover in modern thermal power plants. Among them, the steam turbine controls the nozzle through each speed regulating valve to control the steam admission of the steam turbine, so as to smoothly control the speed when the unit starts, that is, the steam turbine speed is determined by the steam admission.

[0003] At present, when the steam turbine generator unit is in the load rejection condition due to unexpected off-grid, the unit instantaneously enters the isolated grid state, the unit suddenly loses the load, correspondingly, the reverse torque acting on the rotor suddenly decreases or disappears, the instantaneous power of the unit is much larger than the load of the isolated grid, which leads to the increase of the instantaneous frequency of the isolated grid, that is, the speed of the steam turbine rises rapidly, and the overspeed protection control unit quickly closes the speed regulating valve to quickly cut off the steam admission of the steam turbine, so as to prevent the steam turbine from overspeeding, that is, to maintain the stability of the isolated grid frequency.

[0004] However, the isolated grid also has certain fixed load that needs to be maintained by the steam turbine generator unit. When the overspeed protection control unit acts for too long or with too large amplitude, that is, the speed regulating valve of the steam turbine is directly closed, correspondingly, the speed of the steam turbine will decrease rapidly, which leads to the instability of the frequency of the isolated grid, thereby easily leading to the tripping or automatic low-frequency protection shutdown of each electrical equipment in the isolated grid due to the too low instantaneous frequency, and affecting the normal operation of the electrical equipment.

[0005] In summary, how to provide a steam turbine overspeed protection control system capable of accurately adjusting the speed regulating valve to ensure the stability of the isolated grid frequency is a problem to be solved by the skilled in the art at present. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a steam turbine overspeed protection control system capable of accurately adjusting the speed regulating valve to ensure the stability of the isolated grid frequency.

[0007] Another purpose of the present application is to provide a steam turbine comprising the steam turbine overspeed protection control system.

[0008] In order to achieve the above purpose, the present application provides the following technical solutions:

[0009] A steam turbine overspeed protection control system, comprising:

[0010] The adjusting device comprises an oil actuator, an adjusting valve and a piston rod, the oil actuator is used to control the opening of the adjusting valve through the piston rod, the piston rod is movably arranged in the oil actuator, and the piston rod is connected with the adjusting valve.

[0011] The limiting device comprises a lock valve and a follow-up assembly, the follow-up assembly is rotatably arranged in the lock valve, one end of the follow-up assembly is arranged on a valve rod assembly in the lock valve, and the other end of the follow-up assembly is arranged above the oil actuator along the axial direction of the piston rod, when the piston rod moves upward to abut against the follow-up assembly, the follow-up assembly presses the valve rod assembly to move downward.

[0012] The oil supply device comprises a pressure oil pipeline, a return oil pipeline, a limiting oil pipeline and an additional pressure oil pipeline, the pressure oil pipeline is communicated with a first port of a servo valve, the return oil pipeline is communicated with a second port of the servo valve, a third port of the servo valve is communicated with a lower chamber of the oil actuator, the limiting oil pipeline is communicated with a relief valve, a first port of the relief valve is communicated with the pressure oil pipeline, a second port of the relief valve is communicated with a first port of the lock valve through the additional pressure oil pipeline, and a second port of the lock valve is communicated with the lower chamber of the oil actuator.

[0013] Preferably, the follow-up assembly comprises a limiting piece, a follow-up connecting rod and a support rod, the limiting piece is connected with the piston rod, one end of the support rod is fixedly connected with the top end of the lock valve, the other end of the support rod is hingedly connected with the follow-up connecting rod, one end of the follow-up connecting rod abuts against the valve rod assembly, and the other end of the follow-up connecting rod is arranged above the limiting piece, when the limiting piece abuts against the follow-up connecting rod, the follow-up connecting rod presses the valve rod assembly to move downward.

[0014] Preferably, an end of the follow-up connecting rod is provided with a first bearing close to the linear sliding table, the limiting piece comprises a connecting rod and a linear sliding table, the linear sliding table is connected with the piston rod through the connecting rod, and the first bearing is arranged in correspondence with the linear sliding table.

[0015] Preferably, the follow-up assembly comprises at least one follow-up connecting rod.

[0016] Preferably, the first port of the lock valve is arranged higher than the second port of the lock valve.

[0017] Preferably, the valve rod assembly comprises a valve rod and a first valve core, the first valve core is sleeved on the valve rod, and when the valve rod is in an unpressurized state, the first valve core is arranged higher than the first port of the lock valve.

[0018] Preferably, the valve rod assembly further comprises a second valve core, the second valve core is sleeved on the bottom end of the valve rod, and an elastic piece is arranged between the second valve core and a valve shell of the lock valve.

[0019] Preferably, the oil inlet of the limiting oil pipeline is connected with a solenoid valve, and the oil outlet is connected with the spool of the unloading valve 8, and the solenoid valve is connected with the control device.

[0020] Preferably, the limiting oil pipeline is connected with the pressure oil pipeline through the solenoid valve.

[0021] A steam turbine comprising a steam turbine overspeed protection control system, wherein the steam turbine overspeed protection control system is any one of the steam turbine overspeed protection control systems.

[0022] When the steam turbine overspeed protection control system is used, the limiting oil pressure is established, the limiting oil pipeline is connected with the limiting oil, and the limiting oil pushes the spool of the unloading valve, so that the first port and the second port of the unloading valve are isolated; the action of the oil motor is controlled by the servo valve, at this time, the second port of the lock valve is opened and the first port is closed, when the regulating valve needs to be closed, the first port and the third port of the servo valve are connected, the pressure oil in the pressure oil pipeline enters the lower chamber of the oil motor through the first port and the third port of the servo valve, and the piston rod is pushed to move upward, the piston rod drives the regulating valve to the set closed position, and at the same time, the pressure oil in the lower chamber flows into the chamber of the lock valve through the second port of the lock valve; when the regulating valve needs to be opened, the third port and the second port of the servo valve are connected, part of the pressure oil in the lower chamber of the oil motor flows out through the oil return pipeline, the piston rod moves downward, and the piston rod drives the regulating valve to the set open position.

[0023] When the load rejection condition occurs, the regulating valve needs to be quickly closed, the limiting oil in the limiting oil pipeline is unloaded, the pressure of the spool of the unloading valve is reduced, the first port and the second port of the unloading valve are connected, at the same time, the first port of the lock valve is opened, the pressure oil in the pressure oil pipeline flows into the additional pressure oil pipeline through the first port and the second port of the unloading valve, the pressure oil flows into the chamber of the lock valve through the first port of the lock valve, the pressure oil in the chamber flows into the lower chamber of the oil motor through the second port of the lock valve, and the piston rod is pushed to move upward quickly, the piston rod moves upward to abut against one end of the follow-up assembly, the other end of the follow-up assembly is pressed against the valve rod assembly of the lock valve to move downward, the first port and the second port of the lock valve are gradually reduced until completely isolated, so that the pressure oil is blocked from flowing into the lower chamber of the oil motor, and the piston rod stops moving upward, correspondingly, the regulating valve stops at the preset quick closing position, that is, the preset opening degree of the regulating valve, wherein, the position of the follow-up assembly can be adjusted to adjust the preset quick closing position.

[0024] Therefore, the preset quick closing position can be calculated according to the total power commonly used by the unit and the actual self-use power commonly used by the island network, the position of the follow-up assembly is reversely inferred, the follow-up assembly is pressed to move a certain distance, the piston rod drives the regulating steam valve to stay at the preset quick closing position, so that the opening degree of the regulating steam valve is prevented from being completely closed, the steam inlet source of the steam turbine is prevented from being cut off, the regulating steam valve is ensured to have a preset opening degree, and the steam turbine is ensured to maintain the normal operation of the electric equipment in the island network and the stability of the island network frequency. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on the provided drawings.

[0026] Figure 1 A structure schematic diagram of a regulating steam valve of a steam turbine overspeed protection control system provided by the present application when being opened;

[0027] Figure 2 A structure schematic diagram of a regulating steam valve of a steam turbine overspeed protection control system provided by the present application when being limited to close;

[0028] Figure 3 A structure schematic diagram of a first port and a second port of a lock valve of a steam turbine overspeed protection control system provided by the present application when being connected;

[0029] Figure 4 A structure schematic diagram of a first port and a second port of a lock valve of a steam turbine overspeed protection control system provided by the present application when being disconnected.

[0030] Figures 1-4 In the drawings, the reference signs include:

[0031] 1 is an oil motor, 2 is a piston rod, 3 is a lock valve, 4 is a follow-up connecting rod, 5 is a straight line sliding table, 6 is a connecting rod, 7 is a supporting rod, 8 is an unloading valve, 9 is a servo valve, 10 is an electromagnetic valve, 11 is a pressure oil pipeline, 12 is a return oil pipeline, 13 is a limiting oil pipeline, 14 is an additional pressure oil pipeline, 15 is a pin shaft, and 16 is a first bearing;

[0032] 31 is a valve rod, 32 is a first valve core, 33 is a second valve core, 34 is an elastic member, 35 is a valve shell, 36 is a valve sleeve, 37 is a second bearing, 38 is a first port of the lock valve, and 39 is a second port of the lock valve;

[0033] 81 is a first port of the unloading valve, and 82 is a second port of the unloading valve.

[0034] 91 is a first port of the servo valve, 92 is a second port of the servo valve, and 93 is a third port of the servo valve. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0036] The core of the present application is to provide a steam turbine overspeed protection control system, which can accurately adjust the governing valve to ensure the stability of the isolated network frequency.

[0037] Another core of the present application is to provide a steam turbine comprising the steam turbine overspeed protection control system.

[0038] It should be noted that the following isolated network refers to an independent power grid that has no connection relationship with the State Grid, such as a factory generator that generates electricity only for the production equipment in the factory; load shedding refers to a situation where the terminal user's power load decreases (for example, a large power equipment failure or a large area line failure), the power generation of the steam turbine generator exceeds the amount delivered to the user, and the load of the steam turbine generator suddenly drops to almost zero, causing the steam turbine speed to suddenly rise.

[0039] Please refer to Figures 1 to 4 The present application provides a steam turbine overspeed protection control system, which comprises an adjusting device, a limiting device and an oil supply device.

[0040] The adjusting device comprises an oil motor 1, a governing valve and a piston rod 2. The piston rod 2 is arranged in the oil motor 1, one end of the piston rod 2 is connected with a piston, and the other end is connected with the governing valve. The piston rod 2 drives the piston to move up and down along the inner wall of the oil motor 1, so as to synchronously drive the governing valve to move, thereby achieving the purpose of controlling the opening degree of the governing valve.

[0041] The limiting device comprises a lock valve 3 and a follow-up assembly. The lock valve 3 is internally provided with a valve rod assembly, which moves up and down along the inner wall of the lock valve 3. The right end of the follow-up assembly is arranged on the valve rod assembly, and the left end is arranged above the oil motor 1 along the axial direction of the piston rod 2. When the piston rod 2 moves upward to abut against the left end of the follow-up assembly, the right end of the follow-up assembly presses the valve rod assembly to move downward.

[0042] The oil supply device comprises a pressure oil pipeline 11, a return oil pipeline 12, a limiting oil pipeline 13 and an additional pressure oil pipeline 14, the pressure oil pipeline 11 is communicated with the first port 91 of the servo valve 9, the return oil pipeline 12 is communicated with the second port 92 of the servo valve 9, the third port 93 of the servo valve 9 is communicated with the lower chamber of the oil actuator 1, the limiting oil pipeline 13 is communicated with the unloading valve 8, the first port 81 of the unloading valve 8 is communicated with the pressure oil pipeline 11, the second port 82 is communicated with the first port 38 of the lock valve 3 through the additional pressure oil pipeline 14, and the second port 39 of the lock valve 3 is communicated with the lower chamber of the oil actuator 1.

[0043] In use, the limiting oil pressure is established, the limiting oil pipeline 13 is connected with the limiting oil, the limiting oil pushes the valve core of the unloading valve 8, and the first port 81 and the second port 82 of the unloading valve 8 are isolated; the action of the oil actuator 1 is controlled by the servo valve 9, at this time, the second port 39 of the lock valve 3 is opened, the first port 38 is closed, and the first port 38 and the second port 39 are connected, as shown in Figure 3 When it is required to close the regulating valve, the first port 91 and the third port 93 of the servo valve 9 are connected, the pressure oil in the pressure oil pipeline 11 enters the lower chamber of the oil actuator 1 through the first port 91 and the third port 93 of the servo valve 9, pushes the piston rod 2 to move upward, the piston rod 2 drives the regulating valve to the set closed position, and at the same time, the pressure oil in the lower chamber flows into the chamber of the lock valve 3 through the second port 39 of the lock valve 3; as shown in Figure 1 When it is required to open the regulating valve, the third port 93 and the second port 92 of the servo valve 9 are connected, part of the pressure oil in the lower chamber of the oil actuator 1 flows out through the return oil pipeline 12, the piston rod 2 moves downward, and the piston rod 2 drives the regulating valve to the set open position.

[0044] As shown in Figure 2 When the load rejection condition occurs, it is required to quickly limit the closing of the regulating valve, the limiting oil in the limiting oil pipeline 13 is unloaded, the pressure of the valve core of the unloading valve 8 is reduced, the first port 81 and the second port 82 of the unloading valve 8 are connected, at the same time, the first port 38 of the lock valve 3 is opened, the pressure oil in the pressure oil pipeline 11 flows into the additional pressure oil pipeline 14 through the first port 81 and the second port 82 of the unloading valve 8, the pressure oil flows into the chamber of the lock valve 3 through the first port 38 of the lock valve 3, the pressure oil in the chamber flows into the lower chamber of the oil actuator 1 through the second port 39 of the lock valve 3, pushes the piston rod 2 to move upward quickly, the piston rod 2 moves upward to abut against one end of the follow-up assembly, the other end of the follow-up assembly presses the valve rod assembly of the lock valve 3 to move downward, the first port 38 and the second port 39 of the lock valve 3 are gradually reduced until completely isolated, as shown in Figure 4The blocking pressure oil flows into the lower chamber of the oil motor 1, the piston rod 2 stops moving upward, and the adjusting valve stops at the preset quick closing position, i.e., the preset opening degree of the adjusting valve, wherein the position of the follow-up assembly is adjusted to adjust the preset quick closing position.

[0045] Therefore, the preset quick closing position can be calculated according to the total power commonly used by the unit and the actual self-use power commonly used by the isolated network, the position of the follow-up assembly is reversely inferred, the valve rod 31 is pressed downward by a certain distance, and the piston rod 2 drives the adjusting valve to stop at the preset quick closing position, so as to avoid the opening degree of the adjusting valve being completely closed, the steam inlet of the steam turbine being cut off, and the adjusting valve having a preset opening degree, so that the steam turbine maintains the normal operation of the electrical equipment in the isolated network and ensures the stability of the frequency of the isolated network.

[0046] It should be noted that the limiting oil in the limiting oil pipeline 13 and the pressure oil in the pressure oil pipeline 11 can be selected as hydraulic oil.

[0047] On the basis of the above embodiment, the follow-up assembly comprises a limiting piece, a follow-up connecting rod 4 and a support rod 7; the left end of the limiting piece is connected with the piston rod 2, one end of the support rod 7 is fixedly connected with the top end of the locking valve 3, the other end is hinged with the follow-up connecting rod 4 through a pin shaft 15, so that the follow-up connecting rod 4 can rotate around the support rod 7, the right end of the follow-up connecting rod 4 is arranged on the top end of the valve rod assembly, and the left end is arranged above the right end of the limiting piece; when the limiting piece abuts against the follow-up connecting rod 4, the follow-up connecting rod 4 presses the valve rod assembly to move downward.

[0048] Specifically, when the load rejection condition occurs, the pressure oil flows into the lower chamber of the oil motor 1 through the locking valve 3, the piston rod 2 drives the limiting piece to move upward, when the limiting piece abuts against the left end of the follow-up connecting rod 4, the right end of the follow-up assembly presses the valve rod assembly to move downward, the first port 38 and the second port 39 of the locking valve 3 gradually decrease until being completely blocked, the blocking pressure oil flows into the lower chamber of the oil motor 1, and the piston rod 2 stops moving upward. Wherein, the fixed position of the limiting piece on the piston rod 2 is adjusted, the stop position of the piston rod 2 is adjusted, and the adjusting valve stops at the preset quick closing position.

[0049] On the basis of the above embodiment, the limiting piece comprises a connecting rod 6 and a linear slide 5, the left end of the connecting rod 6 is fixedly connected with the piston rod 2, and the right end is fixedly connected with the linear slide 5; the left end of the follow-up connecting rod 4 is provided with a first bearing 16, and the follow-up connecting rod 4 can rotate relative to the first bearing 16; the first bearing 16 is arranged correspondingly to the linear slide 5, preferably, the linear slide 5 is a trapezoidal slide, and the first bearing 16 moves along the slope waist of the trapezoidal slide; when the first bearing 16 abuts against the top end of the slope waist, the follow-up connecting rod 4 presses the valve rod assembly to move downward, such as Figure 2As shown, when the first bearing 16 moves to the end of the inclined waist, i.e. the first bearing 16 is about to fall off the inclined waist of the trapezoidal slide, the first port 38 and the second port 39 of the lock valve 3 are completely blocked to block the flow of pressure oil into the lower chamber of the oil motor 1, so that the piston rod 2 stops moving upward, and the adjusting valve stops at the preset quick closing position.

[0050] Optionally, the top end of the linear slide 5 is provided with a clamping groove, and the clamping groove is inclinedly arranged towards the left side of the linear slide 5. The left end of the follow-up connecting rod 4 is provided with a clamping block. The slot of the clamping groove is correspondingly arranged with the clamping block. When the top end of the clamping groove moves to the follow-up connecting rod 4, the clamping block is movably clamped in the clamping groove, so that the follow-up connecting rod 4 stably abuts against the limiting piece. When the follow-up connecting rod 4 moves to the bottom end of the clamping groove, the first port 38 and the second port 39 of the lock valve 3 are completely blocked.

[0051] On the basis of the above embodiment, the follow-up assembly includes at least one follow-up connecting rod. When the distance between the lock valve 3 and the oil motor 1 is far, a plurality of follow-up connecting rods 4 can be arranged to form a connecting rod mechanism, so as to achieve the purpose of rotatably connecting the limiting piece and the valve rod assembly.

[0052] Optionally, the follow-up connecting rod 4 is in an arc structure, so as to facilitate the follow-up connecting rod 4 to rotate left and right around the support rod 7, and facilitate the right end of the follow-up connecting rod 4 to be pressed against the valve rod assembly.

[0053] On the basis of the above embodiment, the first port 38 of the lock valve 3 is arranged higher than the second port 39 of the lock valve 3, so as to facilitate the pressure oil in the additional pressure oil pipeline 14 to quickly flow into the oil motor 1 from the first port 38 and the second port 39 of the lock valve 3, and facilitate the valve rod assembly to timely cut off the first port 38 and the second port 39 of the lock valve 3 when the valve rod assembly is pressed to move downward.

[0054] On the basis of the above embodiment, the valve rod assembly includes a valve rod 31 and a first valve core 32. The first valve core 32 is sleeved on the valve rod 31. When the valve rod 31 is in an unpressurized state, the first valve core 32 is arranged higher than the first port 38 of the lock valve 3.

[0055] Specifically, the top end of the valve rod 31 abuts against the follow-up connecting rod 4 through a second bearing 37. The first valve core 32 is sleeved on the valve rod 31, so that the valve rod 31 drives the first valve core 32 to move along the inner wall of the lock valve 3. When the valve rod 31 is in an unpressurized state in the lock valve 3, i.e. the valve rod 31 is in a free position, the first valve core 32 is arranged higher than the first port 38 of the lock valve 3, so that the valve rod 31 driven to move downward can block the first port 38 of the lock valve 3.

[0056] On the basis of the above embodiment, the valve rod assembly further includes a second valve core 33. The second valve core 33 is sleeved on the bottom end of the valve rod 31. The second valve core 33 and the valve shell 35 of the lock valve 3 are provided with an elastic piece 34.

[0057] Specifically, the second valve core 33 is arranged at the bottom end of the valve rod 31, the bottom end of the second valve core 33 is connected with a pressing plate, and an elastic element 34 is arranged between the pressing plate and the bottom end of the valve housing 35 of the lock valve 3, so that when the valve rod 31 is pressed, the valve rod 31 moves downward, the elastic element 34 is compressed by the second valve core 33, and when the pressure on the valve rod 31 is reduced, the valve rod 31 is automatically moved upward by a corresponding distance according to the restoring force of the elastic element 34, thereby enhancing the flexibility of the reset of the valve rod 31.

[0058] Optionally, a valve sleeve 36 is arranged on the inner wall of the valve housing 35, so as to reduce the wear of the inner wall of the valve housing 35.

[0059] On the basis of the above embodiment, the oil inlet of the restriction oil pipeline 13 is connected with the electromagnetic valve 10, and the oil outlet is connected with the valve core of the unloading valve 8, and the electromagnetic valve 10 is signal connected with the control device.

[0060] Specifically, the oil outlet of the restriction oil pipeline 13 is connected with the valve core of the unloading valve 8, and the oil inlet is connected with the electromagnetic valve 10, when the control device receives the instruction of quickly closing the regulating steam valve, the control device controls the electromagnetic valve 10 to open, so that the restriction oil in the restriction oil pipeline 13 flows out from the oil inlet, so as to reduce the pressure on the valve core of the unloading valve 8, thereby connecting the first port 81 and the second port 82 of the unloading valve 8. This setting mode can quickly unload the restriction oil, so that the regulating steam valve can be quickly stopped at the preset quick closing position.

[0061] It should be noted that the servo valve 9 and the lock valve 3 are signal connected with the control device, so as to remotely control the servo valve 9 and the lock valve 3.

[0062] On the basis of the above embodiment, the restriction oil pipeline 13 is connected with the pressure oil pipeline 11 through the electromagnetic valve 10, specifically, the electromagnetic valve 10 is connected with the oil inlet of the restriction oil pipeline 13 and the pressure oil pipeline 11, so that the restriction oil and the pressure oil are the same oil supply source, and the restriction oil discharged from the restriction oil pipeline 13 flows into the pressure oil pipeline 11, so as to save the oil supply cost.

[0063] In addition to the above steam turbine overspeed protection control system, the application also provides a steam turbine comprising the steam turbine overspeed protection control system, and the structures of other parts of the embodiment are disclosed in the prior art, which will not be described herein.

[0064] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between various embodiments can be referred to each other.

[0065] The above has carried out the detailed introduction to the steam turbine overspeed protection control system and the steam turbine provided by the application. The principle and implementation mode of the application are described by applying specific examples in this paper, and the above example description is only used to help understand the method and core idea of the application. It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the application, the application can be improved and modified, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A turbine overspeed protection control system, characterized by, The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system.

2. The turbine overspeed protection control system of claim 1, wherein, The application relates to a steam turbine overspeed protection control system.

3. A turbine overspeed protection control system according to claim 1 or 2, characterised in that, The application relates to a steam turbine overspeed protection control system.

4. The turbine overspeed protection control system of claim 3, wherein, The application relates to a steam turbine overspeed protection control system.

5. The turbine overspeed protection control system of claim 4, wherein, The application relates to a steam turbine overspeed protection control system.

6. A turbine overspeed protection control system according to claim 1 or 2, characterised in that, The application relates to a steam turbine overspeed protection control system.

7. The turbine overspeed protection control system of claim 6, wherein, The application relates to a steam turbine overspeed protection control system.

8. A steam turbine comprising a steam turbine overspeed protection control system, characterized in that The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine overspeed protection control system. 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The application relates to a steam turbine overspeed protection control system. The application relates to a steam turbine

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