Integrated steam turbine control cabinet with rotating speed control and overspeed protection functions

Abstract

The utility model discloses an integrated steam turbine control cabinet with rotating speed control and overspeed protection functions. A cabinet door is installed on a cabinet body in an openable and closable mode. The overspeed protector is arranged in the cabinet body and outputs an emergency shutdown signal when the rotating speed of the steam turbine reaches a set value, and a tripping valve of the steam turbine is closed. The power supply module I and the power supply module II are arranged in the cabinet body and are electrically connected with the UPS power supply I and the UPS power supply II respectively; the input end of the isolation redundancy module is electrically connected with the output end of the first power module and the output end of the second power module, and the output end of the isolation redundancy module is electrically connected with one power input end of a plurality of overspeed protector protection modules of the overspeed protector and used for conducting redundant power supply on the overspeed protector protection modules. The UPS power supply I is also electrically connected with the other power supply input end of the overspeed protector protection module so as to supply power to the overspeed protector protection module; the speed regulator is arranged in the cabinet body, powered by the isolation redundancy module and used for regulating the rotating speed of the steam turbine.

Description

Technical Field

[0001] This application relates to the field of steam turbine control technology, specifically an integrated steam turbine control cabinet with speed control and overspeed protection functions. Background Technology

[0002] Speed ​​control and overspeed protection are crucial for the safe operation of steam turbines. Currently, turbine speed control typically involves a governor sending a control signal to a proportional valve to regulate the steam flow into the turbine, ensuring stable operation near the rated speed. Overspeed protection relies on mechanical or electromagnetic tripping devices. However, the current components used for turbine speed control and overspeed protection are discretely installed near the turbine location, resulting in issues such as high vibration, significant interference, low integration, extensive external wiring, long installation time, low installation and maintenance efficiency, and poor safety redundancy. Therefore, it is necessary to address these problems. Utility Model Content

[0003] The purpose of this application is to provide an integrated steam turbine control cabinet with speed control and overspeed protection functions to solve the problems in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution: an integrated steam turbine control cabinet with speed control and overspeed protection functions, comprising:

[0005] Cabinet 1;

[0006] Cabinet door 2 is installed on the cabinet body 1 and can be opened and closed;

[0007] The overspeed protector 5 is located inside the cabinet 1 and includes multiple overspeed protector protection modules. It is used to receive the speed signal of the steam turbine and output an emergency stop signal when the speed of the steam turbine reaches a set value, thereby closing the trip valve of the steam turbine.

[0008] Power module 7 and power module 8 are installed in the cabinet 1 and are electrically connected to UPS power supply 15 and UPS power supply 26 respectively, for converting the 220VAC supplied by UPS power supply 15 and UPS power supply 26 into 24VDC output.

[0009] The isolation redundancy module 9 has its input terminal electrically connected to the output terminals of the power supply module 7 and the power supply module 8, respectively. The output terminal of the isolation redundancy module 9 is electrically connected to one power input terminal of one of the multiple overspeed protection modules of the overspeed protector 5 to provide redundant power supply for the multiple overspeed protection modules. The UPS power supply 15 is also electrically connected to another power input terminal of the overspeed protection module to supply power to the overspeed protection module.

[0010] Speed ​​controller 11, located inside the cabinet 1, is powered by the isolation redundancy module 9 and is used to adjust the turbine speed.

[0011] Furthermore, the integrated turbine control cabinet with speed control and overspeed protection functions also includes:

[0012] Fan 3 is installed on the top of the cabinet 1;

[0013] An air inlet 6 is installed at the lower part of the cabinet door 2 and has at least one layer of filter; the air inlet 6 is connected to the suction end of the fan 3;

[0014] A temperature control module 10 is installed inside the cabinet 1, located in the area between the air inlet 6 and the fan 3. The temperature control module 10 is used to detect the temperature inside the cabinet 1 to control the start and stop of the fan 3; the temperature control module 10 is also used to output a temperature alarm signal.

[0015] The fan 3 and the temperature control module 10 are powered by the GPS power supply 17.

[0016] Furthermore, the integrated turbine control cabinet with speed control and overspeed protection functions also includes:

[0017] Door switch 13 is installed on the cabinet body 1 and linked with the cabinet door 2 to detect the opening and closing status of the cabinet door 2;

[0018] The lighting lamp 14 is installed inside the cabinet 1 and is controlled to turn on and off by the door switch 13.

[0019] Furthermore, the touch screen 4 of the speed controller 11 is mounted on the cabinet door 2.

[0020] Furthermore, the integrated turbine control cabinet with speed control and overspeed protection functions also includes a terminal block 12 installed in the cabinet 1 for relaying the output terminals of the overspeed protector 5, the speed governor 11, and the temperature control module 10 to external actuators.

[0021] Furthermore, the power module 7 and the power module 8 are also used to output power monitoring signals.

[0022] Furthermore, the integrated turbine control cabinet with speed control and overspeed protection functions also includes: primary air switches respectively connected to the GPS power supply 17, the UPS power supply 15 and the UPS power supply 16, and secondary air switches connected in parallel on the output side of the primary air switches and electrically connected to the corresponding power supply module 7, the overspeed protector 5, the power supply module 8, the temperature control module 10 and the door switch 13.

[0023] Furthermore, the overspeed protector 5, the primary air switch, the temperature control module 10, and the power module 7 are arranged vertically from top to bottom within the cabinet 1, and the secondary air switch and the primary air switch are arranged side by side in the horizontal direction; the power module 8 and the isolation redundancy module 9 are arranged side by side in the horizontal direction with the power module 7.

[0024] The beneficial technical effects of this application are as follows:

[0025] 1. Integrating the overspeed protector and speed controller into the cabinet not only improves the reliability and safety of the system, but also optimizes the space layout, improves communication efficiency, enhances protection functions, and achieves energy saving and consumption reduction.

[0026] Second, the system employs two 220VAC UPS power supplies with isolated redundant power modules to provide redundant power to the overspeed protector and speed controller. Even during a power outage, the UPS provides continuous power, and the isolated redundant power module configuration ensures that if a single power module fails, the others can take over the load, preventing system downtime due to power failure. The isolated redundant power modules support hot-swapping, allowing for module replacement or maintenance without shutting down the system, further improving system availability. This dual guarantee of UPS power and redundant power supply ensures adequate power for the overspeed protector and speed controller, enhancing system reliability.

[0027] Third, the compact design of the control cabinet allows the overspeed protector and speed controller to be integrated into a limited space, reducing the equipment's footprint and improving space utilization. Furthermore, the integrated design reduces the need for and complexity of external wiring, lowers installation and maintenance costs, reduces the risk of malfunctions due to wiring errors or signal interference, and simplifies system complexity. The integrated design also reduces the workload of maintenance personnel and improves maintenance efficiency.

[0028] Fourth, the combination of the governor's precise control function and the overspeed protector's rapid response capability effectively prevents equipment from operating at excessive speed, avoiding potential turbine safety accidents. The integration of the overspeed protector and governor enables the system to achieve more comprehensive protection functions. For example, the overspeed protector can monitor the equipment speed in real time and immediately trigger the protection mechanism once it exceeds a preset value, while the governor can flexibly adjust the equipment speed according to actual needs, ensuring the equipment operates in optimal condition. Furthermore, the governor also has protection functions against overload, overheating, and other abnormal conditions, further enhancing the system's stability and safety.

[0029] V. An isolated redundant power supply module is installed between the power supply module and the overvoltage protector and speed controller. This module provides overvoltage and short-circuit protection, protecting the instruments from damage in the event of abnormalities (such as overvoltage or surges) in UPS power supply one and / or UPS power supply two. UPS power supply one and / or UPS power supply two may introduce electromagnetic interference or power supply noise, which can affect the signal accuracy of the instruments. The isolated redundant power supply module isolates this noise, ensuring that the instruments receive clean signals, thereby improving the accuracy and stability of measurements.

[0030] 6. The cabinet is equipped with a fan and a temperature control module. If the temperature inside the cabinet is higher than the set temperature and the fan cannot effectively cool the inside of the cabinet, the temperature control module will send a temperature alarm signal to the DCS system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the cabinet structure of this application (with cabinet doors removed).

[0032] Figure 2 This is a front view of the cabinet in this application;

[0033] Figure 3 This is a schematic diagram of the control wiring for this application. Figure 1 ;

[0034] Figure 4 This is a schematic diagram of the control wiring for this application. Figure 2 ;

[0035] In the diagram: 1. Cabinet; 2. Cabinet door; 3. Fan; 4. Touch screen; 5. Overspeed protector; 6. Air inlet; 7. Power module one; 8. Power module two; 9. Isolation redundancy module; 10. Temperature control module; 11. Speed ​​controller; 12. Terminal block; 13. Door switch; 14. Lighting; 15. UPS power supply one; 16. UPS power supply two; 17. GPS power supply. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Please see Figures 1 to 4 An integrated steam turbine control cabinet with speed control and overspeed protection functions includes a cabinet body 1, a cabinet door 2, an overspeed protector 5, a power supply module one 7, a power supply module two 8, an isolation redundancy module 9, and a speed controller 11, wherein:

[0038] Cabinet door 2 is openable and closable and mounted on cabinet 1; overspeed protector 5 is located inside cabinet 1 and includes multiple overspeed protector modules for receiving turbine speed signals and outputting an emergency stop signal when the turbine speed reaches a set value, closing the turbine's trip valve. It can be understood that the extraction of the turbine speed signal and the communication connection with the overspeed protector 5 can utilize existing technology, the turbine's trip valve can utilize existing solenoid valve technology, and the electrical signal connection between the overspeed protector 5 and the trip valve can also utilize existing technology; power module 1 7 and power module 2 8 are mounted on cabinet 1 and electrically connected to UPS power supply 15 and UPS power supply 2 16 respectively, for powering UPS power supply 15... The 220VAC supplied by UPS power supply 16 is converted to 24VDC output; the input terminal of the isolation redundancy module 9 is electrically connected to the output terminals of power supply module 7 and power supply module 8 respectively, and the output terminal of the isolation redundancy module 9 is electrically connected to one power input terminal of multiple overspeed protection modules of overspeed protector 5 to provide redundant power supply for multiple overspeed protection modules, that is, to provide 24VDC power supply; UPS power supply 15 is also electrically connected to another power input terminal of the overspeed protection module to provide power supply for the overspeed protection module, that is, to provide 220VAC power supply; the speed controller 11 is located in cabinet 1, powered by the isolation redundancy module 9, and is used to regulate the turbine speed; please refer to the following for details. Figure 3 In this embodiment, three overspeed protection modules are connected in parallel: overspeed protection module A, overspeed protection module B, and overspeed protection module C. It can be understood that overspeed protection module A, overspeed protection module B, and overspeed protection module C can all accept 220VAC and 24VDC power supply.

[0039] According to the structure provided in this embodiment, integrating the overspeed protector 5 and the speed controller 11 into the cabinet 1 not only improves the reliability and safety of the system but also optimizes the space layout, improves communication efficiency, enhances protection functions, and achieves energy saving and consumption reduction. Two 220VAC UPS power supplies, namely UPS power supply one 15 and UPS power supply two 16, are used, and an isolation redundancy module 9 is configured to provide redundant power to the overspeed protector 5 and the speed controller 11. Even when the plant power supply fails, UPS power supply one 15 or UPS power supply two 16 can provide continuous power supply, and the configuration of the isolation redundancy module 9 ensures that in the event of a failure of a single power module (i.e., UPS power supply one 15 or UPS power supply two 16), other power modules can take over the load, avoiding system shutdown due to power failure. The isolation redundancy module 9 supports hot-swapping, allowing replacement or maintenance of UPS power supply one 15 or UPS power supply two 16 without shutting down the system, further improving system availability. With both UPS power supply and redundant power supply, the power supply to the overspeed protector 5 and the speed controller 11 is doubly guaranteed, improving system reliability. The compact design of cabinet 1 allows the overspeed protector 5 and speed controller 11 to be integrated into a limited space, reducing the equipment footprint and improving space utilization. The precise control function of speed controller 11 combined with the rapid response capability of overspeed protector 5 effectively prevents equipment overspeed operation and avoids potential turbine safety accidents. The integration of overspeed protector 5 and speed controller 11 enables the system to achieve more comprehensive protection functions. For example, overspeed protector 5 can monitor the equipment speed in real time and immediately trigger the protection mechanism once it exceeds the preset value, while speed controller 11 can flexibly adjust the equipment speed according to actual needs to ensure the equipment operates in optimal condition. In addition, speed controller 11 also has protection functions against overload, overheating, and other abnormal conditions, further improving the stability and safety of the system. The isolated redundant power module 9, installed between UPS power supply 15 or UPS power supply 2 16 and overspeed protector 5 and speed controller 11, has overvoltage protection, short-circuit protection, and other functions, protecting the instruments from damage when abnormalities occur in UPS power supply 15 and / or UPS power supply 2 16 (such as overvoltage, surge, etc.). UPS power supply 15 and / or UPS power supply 2 16 may introduce electromagnetic interference or power supply noise, which may affect the signal accuracy of the instruments. The isolated redundant power supply module 9 isolates this noise, ensuring that the instruments receive clean signals, thereby improving the accuracy and stability of measurements.

[0040] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4The integrated steam turbine control cabinet with speed control and overspeed protection functions also includes a fan 3, an air inlet 6, and a temperature control module 10. The fan 3 is installed at the top of the cabinet 1; the air inlet 6 is installed at the bottom of the cabinet door 2 and has at least one layer of filter, such as a filter element or filter cotton; the air inlet 6 is connected to the suction end of the fan 3; the temperature control module 10 is installed inside the cabinet 1, located in the area between the air inlet 6 and the fan 3. The temperature control module 10 is used to detect the temperature inside the cabinet 1 to control the start and stop of the fan 3; the temperature control module 10 is also used to output a temperature alarm signal; the fan 3 and the temperature control module 10 are powered by a GPS power supply 17.

[0041] According to the structure provided in this embodiment, the cabinet 1 is equipped with a fan 3 and a temperature control module 10. If the temperature inside the cabinet 1 exceeds the set temperature and the fan 3 cannot effectively cool the cabinet 1, the temperature control module 10 will send a temperature alarm signal to the DCS system, thereby further enhancing the safety and reliability of this control cabinet. Specifically, the temperature control module 10 is connected in series with the fan 3. When the temperature sensor of the temperature control module 10 detects that the temperature has reached the set value, the temperature control module 10 closes its internal switch, and the fan 3 starts to cool the inside of the cabinet 1. When the temperature continues to rise for some reason and reaches the set alarm temperature, the temperature control module 10 will output a temperature alarm signal.

[0042] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The integrated turbine control cabinet with speed control and overspeed protection functions also includes a door switch 13 and a lighting lamp 14. In this embodiment, the door switch 13 is installed on the cabinet body 1 and linked to the cabinet door 2 to detect the opening and closing status of the cabinet door 2; the lighting lamp 14 is installed inside the cabinet body 1 and controlled by the door switch 13 to turn on and off. According to the structure provided in this embodiment, the lighting lamp 14 inside the cabinet body 1 is connected in series with the door switch 13. Opening the cabinet door 2 closes the switch, and the lighting lamp 14 lights up.

[0043] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The touch screen 4 of the speed controller 11 is installed on the cabinet door 2, so that visual operation and routine visual inspection can be conveniently performed without opening the cabinet door 2.

[0044] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4The integrated turbine control cabinet with speed control and overspeed protection functions also includes a terminal block 12 installed in the cabinet 1 for relaying the output terminals of the overspeed protector 5, speed controller 11, and temperature control module 10 to external actuators. According to the structure provided in this embodiment, the functions required by the user are connected from the speed controller 11 and overspeed protector 5 to the terminal block 12, allowing the user to select the output. This integrated design reduces the need for and complexity of external wiring, lowers installation and maintenance costs, reduces the risk of failure due to wiring errors or signal interference, and simplifies system complexity. The integrated design also reduces the workload of maintenance personnel and improves maintenance efficiency.

[0045] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 Power modules 7 and 8 are also used to output a power monitoring signal, which is a 24V power monitoring signal. The function of this signal is to allow the user to connect it and monitor power modules 7 and 8 in real time to ensure the safety and stability of the power supply. It can be understood that power modules 7 and 8 can be power modules with the above functions in this technical field.

[0046] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The integrated turbine control cabinet with speed control and overspeed protection functions also includes primary air switches (CP01, CP02, CP03) respectively connected to GPS power supply 17, UPS power supply 15, and UPS power supply 2 16. Secondary air switches (QF) are connected in parallel to the output sides of the primary air switches (CP01, CP02, CP03) and electrically connected to the corresponding power modules 1 7, 2 8, temperature control module 10, and door switch 13. According to the structure provided in this embodiment, since one 24VDC power supply is needed for the speed controller 11 inside the cabinet 1, and one 220VAC and one redundant 24VDC power supply are needed for the overspeed protector 5, a secondary air switch (QF) is provided for each power supply to power module 1 7, overspeed protector 5, power module 2 8, temperature control module 10, and door switch 13. This ensures that each power supply is controllable, facilitating initial debugging and subsequent maintenance and diagnosis. Understandably, in this embodiment, the overspeed protector protection modules A, B, and C of the overspeed protector 5 are all connected in parallel to the output terminal of the primary air switch CP01 through a secondary air switch QF.

[0047] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4The overspeed protector 5, primary air switches (CP01, CP02, CP03), temperature control module 10, and power module 7 are arranged vertically from top to bottom within the cabinet 1. The secondary air switch QF is arranged horizontally alongside the primary air switches (CP01, CP02, CP03). The second power module 8 and the isolation redundancy module 9 are arranged horizontally alongside power module 7. According to the structure provided in this embodiment, each component constitutes a functional module area, facilitating installation and subsequent maintenance. It also facilitates the electrical signal connection between the overspeed protector 5 and the touchscreen 4. Furthermore, when operating the primary air switches (CP01, CP02, CP03) and the secondary air switch QF, their height is more ergonomic, providing a better fit for human height. The temperature control module 10, located in the middle between the primary air switches (CP01, CP02, CP03) and power modules 7 and 8, can more sensitively detect temperature changes in these key components, enhancing safety.

[0048] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0051] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated steam turbine control cabinet with speed control and overspeed protection functions, characterized in that, include: Cabinet (1); Cabinet door (2) is installed on the cabinet body (1) and can be opened and closed; An overspeed protector (5) is installed inside the cabinet (1) and includes multiple overspeed protector protection modules for receiving the speed signal of the steam turbine and outputting an emergency stop signal when the speed of the steam turbine reaches a set value, thereby closing the trip valve of the steam turbine. Power module 1 (7) and power module 2 (8) are installed in the cabinet (1) and are electrically connected to UPS power supply 1 (15) and UPS power supply 2 (16) respectively, for converting the 220VAC supplied by UPS power supply 1 (15) and UPS power supply 2 (16) into 24VDC output. The input terminal of the isolation redundancy module (9) is electrically connected to the output terminals of the power module one (7) and the power module two (8) respectively. The output terminal of the isolation redundancy module (9) is electrically connected to one power input terminal of the multiple overspeed protection modules of the overspeed protector (5) for redundant power supply to the multiple overspeed protection modules. The UPS power supply one (15) is also electrically connected to another power input terminal of the overspeed protection module for power supply to the overspeed protection module. The speed controller (11) is located inside the cabinet (1) and is powered by the isolation redundancy module (9) to regulate the turbine speed.

2. The integrated steam turbine control cabinet with speed control and overspeed protection functions according to claim 1, characterized in that, Also includes: A fan (3) is installed on the top of the cabinet (1); An air inlet (6) is installed at the lower part of the cabinet door (2) and has at least one layer of filter; the air inlet (6) is connected to the suction end of the fan (3); The temperature control module (10) is installed inside the cabinet (1) and located in the area between the air inlet (6) and the fan (3). The temperature control module (10) is used to detect the temperature inside the cabinet (1) to control the start and stop of the fan (3). The temperature control module (10) is also used to output a temperature alarm signal. The fan (3) and the temperature control module (10) are powered by the GPS power supply (17).

3. The integrated steam turbine control cabinet with speed control and overspeed protection functions according to claim 2, characterized in that, Also includes: A door switch (13) is installed on the cabinet (1) and linked with the cabinet door (2) to detect the opening and closing status of the cabinet door (2); The lighting lamp (14) is installed inside the cabinet (1) and is controlled to turn on and off by the door switch (13).

4. The integrated steam turbine control cabinet with speed control and overspeed protection functions according to claim 1, characterized in that: The touch screen (4) of the speed controller (11) is mounted on the cabinet door (2).

5. The integrated steam turbine control cabinet with speed control and overspeed protection functions according to claim 2, characterized in that: It also includes a terminal block (12) installed in the cabinet (1) for relaying the output terminals of the overspeed protector (5), the speed controller (11), and the temperature control module (10) to the external actuator.

6. The integrated steam turbine control cabinet with speed control and overspeed protection functions according to claim 2, characterized in that: The power module one (7) and the power module two (8) are also used to output power monitoring signals.

7. The integrated steam turbine control cabinet with speed control and overspeed protection functions according to claim 3, characterized in that, Also includes: The primary air switches are respectively connected to the GPS power supply (17), the UPS power supply one (15) and the UPS power supply two (16). The output side of the primary air switch is connected in parallel with the secondary air switch and electrically connected to the corresponding power module one (7), the overspeed protector (5), the power module two (8), the temperature control module (10) and the door switch (13).

8. The integrated steam turbine control cabinet with speed control and overspeed protection functions according to claim 7, characterized in that: The overspeed protector (5), the primary air switch, the temperature control module (10), and the power module one (7) are arranged vertically from top to bottom in the cabinet (1), and the secondary air switch and the primary air switch are arranged side by side in the horizontal direction; the power module two (8) and the isolation redundancy module (9) are arranged side by side in the horizontal direction with the power module one (7).

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