CN212003274U - Automatic protection control system for steam turbine - Google Patents
Automatic protection control system for steam turbine Download PDFInfo
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- CN212003274U CN212003274U CN202020655421.9U CN202020655421U CN212003274U CN 212003274 U CN212003274 U CN 212003274U CN 202020655421 U CN202020655421 U CN 202020655421U CN 212003274 U CN212003274 U CN 212003274U
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Abstract
The utility model provides an automatic protection control system for steam turbine, automatic protection control system include automatic start protection logic device, and automatic start protection logic device includes: a control module; the overspeed protection module is logically connected with the control module; the low-rotation-speed protection module is logically connected with the control module; the control module controls the steam turbine to stop according to a logic command received from at least one of the overspeed protection module, the low-speed protection module and the rotor viscous protection module. The automatic protection control system can be used for accurately judging the condition of risk of the steam turbine, and can more comprehensively avoid the possible fault condition of the steam turbine, so that the steam turbine can run more safely, and the safety of steam turbine operators and peripheral workers can be better protected.
Description
Technical Field
The utility model relates to an automatic protection control system for steam turbine particularly relates to an automatic protection control system for SST150 type steam turbine.
Background
The steam turbine serves as a driving device for operating the machine by converting the thermal energy of the steam into kinetic energy. Steam turbines typically have an overspeed protection function that prevents the turbine from tripping when the unit speed exceeds the maximum continuous turbine speed. However, the provision of a protective module is not considered for the remaining rotational speed ranges, which reduces the safety of the steam turbine plant to a certain extent.
The steam turbine has a governor valve for controlling the amount of steam intake, which determines the speed of the machine. However, if the valve fails, for example if the valve is at a predetermined opening, for example 30%, the rotor does not reach the predetermined speed, which may be caused by the occurrence of a valve jam. If the valve is opened further, the valve may jump over from the stuck position and directly jump to a larger opening, for example, 65%, and the amount of steam intake is suddenly increased, the temperature is suddenly increased, and the rotational speed is also rapidly increased, which may cause the turbine to run away. This can also result in personal risks to the operating personnel and to the personnel working around the steam turbine installation.
Furthermore, for example, in the case of a throttling phase of a steam turbine, the rotational speed begins to drop without further intervention, and if the rotational speed drops below a minimum continuous rotational speed, this indicates that a malfunction of a component such as a line or a valve has occurred. This also damages the unit and puts the operating personnel or the surrounding staff at risk.
Heretofore, these situations have been determined manually only by the experience of the operator. This is sometimes unreliable depending on the experience of the operator. And if the operator is inexperienced, greater property and personnel loss can result.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that, the automatic protection control system of the steam turbine among the prior art only has overspeed protection function, and has ignored various risks that probably appear when steam turbine low-speed operation or steam turbine begin to start.
The utility model provides an automatic protection control system for steam turbine can have the condition of risk to the steam turbine to carry out accurate judgement with the help of this automatic protection control system, can avoid the fault condition that the steam turbine probably appears more comprehensively to make the steam turbine can move more safely, and protect steam turbine operating personnel and peripheral staff's safety better.
Additionally, the utility model discloses an automatic protection control system for steam turbine need not to increase new equipment, only adds new functional module on the basis of the used device of current steam turbine, does not increase new equipment cost from this, is that cost is favorable.
The utility model provides an automatic protection control system for steam turbine, automatic protection control system includes automatic start protection logic device, automatic start protection logic device includes:
a control module;
the overspeed protection module is logically connected with the control module, receives a signal representing the current rotating speed of a rotor of the steam turbine during the operation of the steam turbine and determines whether the current rotating speed of the rotor is greater than a first preset rotating speed according to the signal of the current rotating speed, and the overspeed protection module sends a shutdown operation instruction to the control module when determining that the current rotating speed of the rotor is greater than the first preset rotating speed;
the low-rotation-speed protection module is logically connected with the control module, receives a signal representing the current rotation speed of a rotor of the steam turbine during the operation process of the steam turbine, and sends a shutdown operation instruction to the control module when the rotation speed of the rotor is less than or equal to a second preset rotation speed smaller than the minimum continuous rotation speed of the steam turbine for a preset time after the rotation speed of the rotor is determined to be greater than or equal to the minimum continuous rotation speed of the steam turbine according to the signal of the current rotation speed;
the rotor viscous protection module is logically connected with the control module, receives a signal representing the current opening of a speed regulating valve of the steam turbine and a signal representing the current rotating speed of a rotor of the steam turbine in the starting process of the steam turbine, sends a shutdown operation instruction to the control module when the opening of the speed regulating valve is determined to be changed from zero to a preset opening and the rotating speed of the rotor is less than a third preset rotating speed matched with the preset opening according to the signal representing the current opening of the speed regulating valve of the steam turbine, the signal representing the current rotating speed of the rotor of the steam turbine and a preset matching relation between the opening of the speed regulating valve and the rotating speed of the rotor,
the control module controls the steam turbine to stop according to a stop operation instruction received from at least one of the overspeed protection module, the low-rotation-speed protection module and the rotor viscous protection module.
According to the scheme, the low-speed protection module and the rotor viscous protection module are integrated in the automatic starting protection logic device for the steam turbine for the first time, compared with the prior art that whether the machine fault occurs or not is judged more accurately through experience of an operator, the safety performance of the machine is improved, and the operator and field personnel are protected more favorably.
Furthermore, the addition of the low speed protection module and the rotor sticking protection module does not bring any added cost to the steam turbine of the prior art, thereby realizing a cost-effective design.
According to one embodiment, the automatic start protection logic device comprises a plurality of detection devices and a throttle valve opening controller, each detection device of the plurality of detection devices detects a current rotational speed of a rotor and obtains a signal representing the current rotational speed of the rotor, the plurality of detection devices are respectively connected with the overspeed protection module, the low rotational speed protection module and the rotor viscous protection module and the overspeed protection module, the low rotational speed protection module and the rotor viscous protection module receive signals representing the current rotational speed of the rotor of the steam turbine from at least two detection devices of the detection devices, the throttle valve opening controller controls an opening of a throttle valve and obtains a signal representing an opening of a throttle valve, the throttle valve opening controller is connected with the rotor viscous protection module and the rotor viscous protection module receives a signal representing the current rotational speed of the throttle valve of the steam turbine from the throttle valve opening controller Signal of the opening degree. Therefore, the running condition of the machine and the control condition of the machine can be detected through the detection device and the opening controller of the speed regulating valve, and comparison analysis can be carried out. By arranging the plurality of detection devices, the rotating speed of the rotor can be detected by other detection devices even if one detection device fails, so that whether the rotating speed of the rotor is greater than or less than the preset rotating speed is judged. Thereby ensuring the accuracy of the detection.
According to one embodiment, said automatic start protection logic device is an automatic start protection logic device for a steam turbine of SST150 type.
According to one embodiment, the underspeed protection module is a underspeed protection module that is logically connected to the control module, receives a signal representing a current rotational speed of a rotor of the steam turbine during operation of the steam turbine, and sends a shutdown operation command to the control module based on the signal representing the current rotational speed when a second predetermined rotational speed of the rotor is less than or equal to 0.98 times the minimum continuous rotational speed of the steam turbine for a predetermined time after determining that the rotational speed of the rotor is greater than or equal to the minimum continuous rotational speed of the steam turbine. Therefore, the machine can be stopped at the optimal time point, and the loss of manpower and financial resources caused by the out-of-control machine is avoided.
According to one embodiment, the low rotational speed protection module is a low rotational speed protection module which is logically connected to the control module, receives a signal representing a current rotational speed of a rotor of the steam turbine during operation of the steam turbine, and, as a function of the signal representing the current rotational speed, sends a shutdown command to the control module when the rotational speed of the rotor is less than or equal to a second predetermined rotational speed which is lower than the minimum continuous rotational speed of the steam turbine for up to 5 seconds after it is determined that the rotational speed of the rotor is greater than or equal to the minimum continuous rotational speed of the steam turbine. Whereby the stop timing can be accurately determined.
According to one embodiment, the rotor sticking protection module is a rotor sticking protection module logically connected to the control module, which receives the signal representing the current opening of the governor valve of the steam turbine and the signal representing the current rotational speed of the rotor of the steam turbine during the startup of the steam turbine and sends the shutdown operation command to the control module when the governor valve is determined to change from zero opening to 30% opening and the rotational speed of the rotor is less than a third predetermined rotational speed of 50 rpm according to the signal representing the current opening of the governor valve and the signal representing the current rotational speed of the rotor of the steam turbine and the preset matching relationship of the opening of the governor valve and the rotational speed of the rotor. During the starting process of the steam turbine, when the speed regulating valve is opened to the opening degree of 30%, and the rotor speed is lower than 50 revolutions per second, the possible valve or pipeline is judged to be in fault.
According to one embodiment, the overspeed protection module is an overspeed protection module which is logically connected to the control module, receives a signal representing a current rotational speed of a rotor of the steam turbine during operation of the steam turbine, determines whether the current rotational speed of the rotor is greater than a first predetermined rotational speed based on the signal representing the current rotational speed, and sends a shutdown operation command to the control module when it is determined that the current rotational speed of the rotor is greater than 1.11 times a maximum continuous rotational speed of the steam turbine. Therefore, when the rotating speed of the rotor exceeds the maximum continuous rotating speed of the steam turbine, the machine can be judged to be stopped at the optimal time point, and therefore the loss of manpower and financial resources caused by the out-of-control machine is avoided.
According to the scheme, the low-speed protection module and the rotor viscous protection module are integrated in the automatic starting protection logic device for the steam turbine for the first time, compared with the prior art that whether the machine fault occurs or not is judged more accurately through experience of an operator, the safety performance of the machine is improved, and the operator and field personnel are protected more favorably.
Furthermore, the addition of the low speed protection module and the rotor sticking protection module does not bring any added cost to the steam turbine of the prior art, thereby realizing a cost-effective design.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention.
Wherein the content of the first and second substances,
figure 1 is a process diagram of the operation of a steam turbine,
fig. 2 is an operation schematic diagram of an automatic start protection logic device of an automatic protection control system for a steam turbine according to a preferred embodiment of the present invention.
List of reference numerals
B10 automatic start protection logic device
S control module
M1 overspeed protection module
M2 low-speed protection module
M3 rotor viscous protection module
S100 first stage
S200 second stage
S300 the third stage
S400 fourth stage
Minimum continuous speed of Vmin turbine
Maximum continuous speed of Vmax turbine
V rotational speed
time t
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
The utility model provides an automatic protection control system for steam turbine, this automatic protection control system have automatic start protection logic device B10, and this automatic start protection logic device especially is used for such as the automatic start protection logic device of the steam turbine that the model produced by Siemens company is SST 150.
The process of starting up a steam turbine is described herein with reference to figure 1. Steam turbines generally rotate a rotor by injecting high-temperature and high-pressure steam onto blades mounted on the rotor to rotate the blades. The turbine is provided with a governor valve, the opening degree of which (i.e., the degree of opening of the governor valve, usually expressed in percentage) is used to change the amount of intake air of the steam, and changing the amount of intake air based on the governor valve enables the speed at which the rotor rotates to be changed.
Fig. 1 shows a process diagram for operating a steam turbine. The horizontal axis represents time t in minutes and the vertical axis represents the rotational speed V of the rotor of the steam turbine in revolutions per minute. In this diagram, only three phases of the operation of the steam turbine are shown by way of example. In a first phase S100, the governor valve is opened, the rotor starts to rotate and the speed of the rotor rises, for example, from 0 rpm to 1000 rpm, and after 1000 rpm, a smooth running phase, which is also commonly referred to as warm-up, is reached. In a second phase S200, the governor valve of the steam turbine is opened and the rotor speed is increased continuously in several steps according to a curve until it reaches the minimum continuous steam turbine speed Vmin, which is, for example, 6880 revolutions per minute. In the third stage S300, the rotor speed of the turbine is increased from the turbine minimum continuous speed Vmin to the turbine maximum continuous speed Vmax. The maximum continuous rotational speed Vmax of the steam turbine is, for example, 10320 revolutions per minute. In the fourth phase S400, the rotor speed of the steam turbine exceeds the maximum continuous turbine speed Vmax. The minimum continuous rotating speed Vmin of the steam turbine and the maximum continuous rotating speed Vmax of the steam turbine are also called as the minimum speed-regulating rotating speed of the steam turbine and the maximum speed-regulating rotating speed of the steam turbine, and the minimum continuous rotating speed Vmin of the steam turbine and the maximum continuous rotating speed Vmax of the steam turbine can be determined before the steam turbine is put into use. Different turbines may have different turbine minimum and turbine maximum continuous speeds.
Fig. 2 shows an operational schematic diagram of an automatic start protection logic device of an automatic protection control system for a steam turbine according to a preferred embodiment of the present invention.
Referring to FIG. 2, the autostart protection logic B10 generally includes a control module S, an overspeed protection module M1, a low speed protection module M2, and a rotor sticking protection module M3. The working principle of the modules in the automatic start protection logic device B10 is specifically described here as an example, and the values given are merely exemplary and may vary according to the specific application. The automatic start protection logic device B10 for a steam turbine is provided with a detection device 11 for detecting the current rotational speed of the rotor of the steam turbine and a governor valve opening controller 12 that controls the opening of the governor valve.
The overspeed protection module M1 is logically connected to the control module S, and during operation of the steam turbine, the overspeed protection module M1 receives a signal indicative of a current rotational speed of a rotor of the steam turbine and the overspeed protection module M1 determines from the signal whether the current rotational speed of the rotor is greater than a first predetermined rotational speed, and the overspeed protection module M1 sends a shutdown operation command to the control module S upon determining that the current rotational speed of the rotor is greater than the first predetermined rotational speed. In conjunction with fig. 1 and 2, the overspeed protection module M1 relates to the fourth stage S400 in fig. 1, i.e. the stage in which the rotational speed of the rotor is greater than the maximum continuous rotational speed Vmax of the steam turbine. In the overspeed protection module M1, the overspeed protection module M1 receives a signal from the detection device 11 indicating the current rotational speed of the rotor of the steam turbine. In the operation process of the steam turbine, when the rotating speed of the rotor rises to the maximum continuous rotating speed Vmax of the steam turbine and continues to rise and is greater than 1.11 times of the maximum continuous speed of the steam turbine, the overspeed protection module judges that a machine has a fault according to a received signal which represents the current rotating speed of the rotor of the steam turbine, and sends an operation instruction of stopping the machine to the control module S. And after receiving the instruction, the control module S controls the steam turbine to stop. Here, the first predetermined rotational speed is set to 1.11 times the maximum continuous rotational speed Vmax of the steam turbine. This value is exemplary, but of course, other values may be used depending on the application. Thus, the overspeed protection module makes it possible to shut down the machine in good time when the machine increases its rotational speed in an uncontrolled manner, in order to prevent losses in manpower and financial resources.
The low-rotation-speed protection module M2 is logically connected with the control module S, and the low-rotation-speed protection module M2 receives a signal about the current rotation speed of the rotor of the steam turbine during the operation of the steam turbine and the low-rotation-speed protection module M2 sends a shutdown operation command to the control module S according to the signal about the current rotation speed when the rotation speed of the rotor is less than or equal to a second predetermined rotation speed smaller than the minimum continuous rotation speed Vmin of the steam turbine for a predetermined time after the rotation speed of the rotor is determined to be greater than or equal to the minimum continuous rotation speed Vmin of the steam turbine. In conjunction with fig. 1 and 2, the low speed protection module M2 relates to the third stage S300 in fig. 1, i.e. the rotor speed is already greater than the minimum continuous turbine speed Vmin. In the low speed protection module M2, the low speed protection module M2 receives a signal from the detection device 11 indicating the current speed of the rotor of the steam turbine. When the rotor speed is greater than or equal to the minimum continuous speed Vmin of the steam turbine in the operation process of the steam turbine and no operation is carried out on the steam turbine to influence the rotor speed in the period, but the rotor speed starts to be reduced, and then is reduced to be less than the minimum continuous speed Vmin of the steam turbine and reaches 0.98 times of the minimum continuous speed Vmin of the steam turbine, and the situation lasts for 5 seconds, the low-speed protection module judges that the machine is in failure according to the received signal representing the current speed of the rotor of the steam turbine, and sends an operation instruction of stopping the machine to the control module. And after receiving the instruction, the control module S controls the steam turbine to stop. Possible causes of the machine failure are, for example, a loss of control of the machine. In the above case 0.98 times the minimum continuous rotational speed Vmin of the turbine is the second predetermined rotational speed. This value is exemplary, but of course, other values may be used depending on the application. Therefore, the machine can be timely shut down when the speed is too low in the running stage of the machine through the low-rotating-speed protection module, so that the loss of manpower and financial resources is prevented.
The rotor viscosity protection module M3 is logically connected to the control module S, and during the starting process of the steam turbine, the rotor viscosity protection module M3 receives the signal representing the current opening degree of the speed regulating valve of the steam turbine and the signal representing the current rotating speed of the rotor of the steam turbine, and the rotor viscosity protection module M3 sends a shutdown operation instruction to the control module S when the speed regulating valve is determined to be changed from the opening degree to the predetermined opening degree and the rotating speed of the rotor is less than a third predetermined rotating speed matched with the predetermined opening degree according to the signal representing the current opening degree of the speed regulating valve and the signal representing the current rotating speed of the rotor of the steam turbine and the preset matching relation between the opening degree of the speed regulating valve and the rotating speed of the. Referring to fig. 1 and 2, the rotor sticking protection module M3 relates to the first stage S100 of fig. 1, i.e., the governor valve begins to open and the turbine warms up. In the rotor sticking protection module M3, the rotor sticking protection module M3 receives a signal indicating the current rotation speed of the rotor of the steam turbine from the detection device 11 and a signal indicating the current opening degree of the governor valve from the governor valve opening degree controller 12. During the starting process, i.e. the warming-up process, of the steam turbine, when the governor valve is opened to a certain extent, for example, when the governor valve is opened from zero opening to 30% opening, the rotor speed should be at least 1000 rpm, for example. But the rotor speed is below 50 rpm, for example due to machine failure or air inlet failure or valve failure. At the moment, the rotor viscosity protection module 3 judges that the machine has a fault according to the preset matching relationship between the signal of the current opening of the speed regulating valve and the signal of the current rotating speed of the rotor and the preset matching relationship between the opening of the speed regulating valve and the rotating speed of the rotor, and sends an operation instruction of stopping the machine to the control module S. And after receiving the instruction, the control module S controls the steam turbine to stop. In this case, the third predetermined rotational speed is 50 revolutions per minute. This value is exemplary, but of course, other values may be used depending on the application. Therefore, the machine can be timely shut down when the speed is too low in the starting stage of the machine through the rotor viscous protection module, so that the loss of manpower and financial resources is prevented.
The automatic start protection logic device B10 for a steam turbine is provided with a plurality of detecting devices 11 and a governor valve opening controller 12. In this case, each of the plurality of detection devices 11 detects the current rotational speed of the rotor and receives a signal representing the current rotational speed of the rotor, the plurality of detection devices 11 being connected to the overspeed protection module M1, the low-speed protection module M2 and the rotor sticking protection module M3, respectively, and the overspeed protection module M1, the low-speed protection module M2 and the rotor sticking protection module M3 receiving signals representing the current rotational speed of the rotor of the steam turbine from at least two of the detection devices 11. The speed valve opening controller 12 may control the opening of the speed valve, wherein the speed valve opening controller outputs a signal regarding the speed valve opening to the speed valve. The governor valve opening controller 12 controls the opening of the governor valve and obtains a signal indicating the opening of the governor valve, the governor valve opening controller 12 is connected to the rotor viscosity protection module M3 and the rotor viscosity protection module M3 receives the signal indicating the current opening of the governor valve of the steam turbine from the governor valve opening controller 12.
The utility model discloses in for example be equipped with three detection device. Even if one of the detecting devices fails, the other two detecting devices can detect the rotor speed, so that whether the rotor speed is greater than or equal to the preset speed or less than the preset speed can be judged. Thereby ensuring the accuracy of the detection. Therefore, preferably, at least two detection means are provided.
The utility model provides an automatic start protection logic device B10 has integrateed low-speed protection module and rotor viscous protection module for the first time, and this is compared and is judged whether to take place machine trouble more accurately through experience by operating personnel among the prior art, has improved the security performance of machine and has protected operating personnel and field personnel more advantageously.
The addition of the low speed protection module and the rotor viscous protection module does not bring any added cost to the prior art steam turbine, thereby achieving a cost-effective design.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.
Claims (7)
1. An automatic protection control system for a steam turbine, characterized in that it comprises an automatic start protection logic device (B10) comprising:
a control module (S);
an overspeed protection module (M1), the overspeed protection module (M1) being connected to the control module (S), the overspeed protection module (M1) receiving a signal indicative of a current rotational speed of a rotor of the steam turbine during operation of the steam turbine and the overspeed protection module (M1) determining from the signal indicative of the current rotational speed whether the current rotational speed of the rotor is greater than a first predetermined rotational speed, and sending a shutdown operation command to the control module (S) upon determining that the current rotational speed of the rotor is greater than the first predetermined rotational speed;
a low rotation speed protection module (M2), the low rotation speed protection module (M2) being connected to the control module (S), the low rotation speed protection module (M2) receiving a signal indicating a current rotation speed of a rotor of the steam turbine during operation of the steam turbine and the low rotation speed protection module (M2) determining whether the rotation speed of the rotor becomes equal to or less than a second predetermined rotation speed (Vmin) smaller than the minimum continuous rotation speed of the steam turbine for a predetermined time after being equal to or greater than a minimum continuous rotation speed (Vmin) of the steam turbine, and sending a shutdown operation command to the control module (S) when it is determined that the rotation speed of the rotor becomes equal to or less than the second predetermined rotation speed (Vmin) smaller than the minimum continuous rotation speed (Vmin) of the steam turbine for a predetermined time after being equal to or greater than the minimum continuous rotation speed (Vmin) of the steam turbine;
a rotor viscosity protection module (M3), wherein the rotor viscosity protection module (M3) is connected with the control module (S), the rotor viscosity protection module (M3) receives a signal representing the current opening degree of a speed regulating valve of the steam turbine and a signal representing the current rotating speed of a rotor of the steam turbine in the starting process of the steam turbine, the rotor viscosity protection module (M3) determines whether the rotating speed of the rotor is less than a third preset rotating speed matched with the preset opening degree when the speed regulating valve changes from the opening degree to the preset opening degree according to the signal representing the current opening degree of the speed regulating valve and the signal representing the current rotating speed of the rotor and the preset matching relation between the opening degree of the speed regulating valve and the rotating speed of the rotor, and sends a stop operation instruction to the control module (S) when the rotating speed regulating valve is determined to change from the opening degree to the preset opening degree and the rotating speed of the rotor is less than the third preset rotating speed matched with the preset opening degree,
the control module (S) controls a turbine to stop according to a stop operation command received from at least one of the overspeed protection module (M1), the low speed protection module (M2), the rotor sticking protection module (M3).
2. The automatic protection control system for steam turbines according to claim 1, characterized in that said automatic start protection logic means (B10) comprise a plurality of detection means (11) and a speed valve opening controller (12), each detection means of said plurality of detection means (11) detecting the current rotation speed of the rotor and deriving a signal representative of the current rotation speed of the rotor, said plurality of detection means (11) being respectively connected with said overspeed protection module (M1), said low rotation speed protection module (M2) and said rotor sticking protection module (M3) and said overspeed protection module (M1), said low rotation speed protection module (M2) and said rotor sticking protection module (M3) respectively receiving signals representative of the current rotation speed of the rotor of the steam turbine from at least two detection means of said detection means (11), said speed valve opening controller (12) controlling the opening of the speed valve and deriving a signal representative of the opening of the speed valve The speed regulating valve opening controller (12) is connected with the rotor viscous protection module (M3) and the rotor viscous protection module (M3) receives a signal representing the current opening of the speed regulating valve of the steam turbine from the speed regulating valve opening controller (12).
3. The automatic protection control system for steam turbines according to claim 1, characterized in that said automatic start protection logic device (B10) comprises an automatic start protection logic device for SST150 type steam turbines.
4. The automatic protection control system for a steam turbine according to claim 1, characterized in that the low rotation speed protection module (M2) determines whether or not the rotation speed of the rotor becomes a second predetermined rotation speed that is equal to or less than 0.98 times the turbine minimum continuous rotation speed (Vmin) after being equal to or more than the turbine minimum continuous rotation speed (Vmin) for a predetermined time.
5. The automatic protection control system for a steam turbine according to claim 1, characterized in that the low rotation speed protection module (M2) determines whether the rotation speed of the rotor becomes equal to or less than a second predetermined rotation speed (rpm) smaller than the turbine minimum continuous rotation speed (Vmin) for a predetermined time of 5 seconds after being equal to or greater than the turbine minimum continuous rotation speed (Vmin).
6. The automatic protection control system for a steam turbine according to claim 1, wherein the rotor sticking protection module (M3) determines whether the rotational speed of the rotor when the governor valve changes from an opening of zero to a predetermined opening of 30% is less than a third predetermined rotational speed of 50 rpm matching the predetermined opening of 30%.
7. The automatic protection control system for a steam turbine according to claim 1, characterized in that the overspeed protection module (M1) determines whether the current rotational speed of the rotor is greater than a first predetermined rotational speed that is 1.11 times the maximum continuous rotational speed (Vmax) of the steam turbine.
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| CN202020655421.9U CN212003274U (en) | 2020-04-26 | 2020-04-26 | Automatic protection control system for steam turbine |
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| CN202020655421.9U CN212003274U (en) | 2020-04-26 | 2020-04-26 | Automatic protection control system for steam turbine |
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Address after: No.3, Gaoxin 7 Road, high tech Industrial Development Zone, Huludao City, Liaoning Province, 125000 Patentee after: Siemens Energy Industry Turbine Machinery (Huludao) Co.,Ltd. Address before: No.3, Gaoxin 7 Road, high tech Industrial Development Zone, Huludao City, Liaoning Province, 125000 Patentee before: SIEMENS INDUSTRIAL TURBOMACHINERY (HULUDAO) Co.,Ltd. |
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