Large-scale generator set enclosed busbar monitoring and control integrated device

Abstract

The utility model discloses an enclosed bus monitoring and control integrated device for a large-scale generator set. The system comprises an information acquisition unit used for performing information acquisition on each phase of enclosed bus and a control cabinet used for centralized control. The control cabinet is internally and intensively provided with an inflation solenoid valve used for controlling a gas source to inflate compressed gas into each phase of enclosed bus, a cooling system composed of a water cooling system and a heat exchanger, a drying system composed of a heater and a molecular sieve, and a PLC controller used as a control unit. Wherein one phase of enclosed bus is connected to the inlet end of the drying system through an inlet pipeline, the outlet end of the drying system is connected with a fan through a heat exchanger of the cooling system, and an air outlet of the fan is connected to the other two phases of enclosed buses. The utility model has the advantages that the engineering field installation workload is greatly simplified, the transportation and rapid deployment of equipment are also facilitated, the structure is reliable, the manufacture is simple, the transportation is convenient, and the field installation is convenient.

Description

Technical Field

[0001] This utility model relates to an integrated monitoring and control device for enclosed busbars of large generator sets, belonging to the field of large power generation system equipment. Background Technology

[0002] With economic and technological development, the capacity of generator units in my country is increasing. Currently, the capacity of large thermal power plants, nuclear power plants, and hydropower stations has reached over 1000MW, and the current transmitted through the enclosed busbars from the generator to the main transformer has reached over 30,000A. The requirements for the drying and insulation performance of the busbars are also increasing. Therefore, it is necessary to strengthen the monitoring and control of the operating status of the enclosed busbars to ensure the stable operation of the generator units. Although some monitoring and control methods are used in the existing technology to ensure the safe operation of the busbars, their structure is unreasonable. When abnormal operating parameters of the busbars are detected, it is difficult to handle and adjust them in a timely manner, resulting in poor reliability and stability. This leads to a short service life of the enclosed busbars and poses significant safety hazards. In addition, due to the large number of equipment modules and connecting pipes, the structure is complex, and the use of various decentralized control devices occupies a lot of space, which also brings inconvenience to equipment inspection and maintenance. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a large-scale generator set enclosed bus monitoring and control integrated device that has a compact structure, is easy to maintain, can effectively ensure the long-term stable operation of the generator set, extend the service life of the enclosed bus, and has good safety.

[0004] To solve the above-mentioned technical problems, the present invention provides an integrated monitoring and control device for large-scale generator set enclosed busbars, comprising an information acquisition unit for collecting information from each phase of the enclosed busbars and a control cabinet for centralized control. The control cabinet is centrally equipped with an air-charging solenoid valve for controlling the supply of compressed gas to each phase of the enclosed busbars, a cooling system consisting of a water-cooling system and a heat exchanger, a drying system consisting of a heater and a molecular sieve, and a PLC controller as a control unit. One phase of the enclosed busbar is connected to the inlet end of the drying system via an inlet pipe, and the outlet end of the drying system is connected to a fan via the heat exchanger of the cooling system. The outlet of the fan is connected to the other two phases of the enclosed busbars.

[0005] The information acquisition unit includes a temperature sensor for acquiring temperature information of the enclosed busbar, a humidity sensor for acquiring humidity information of the enclosed busbar, and a pressure sensor for acquiring pressure information of the enclosed busbar. The temperature sensor, humidity sensor, and pressure sensor are all connected to the PLC controller.

[0006] The drying system is connected to the B-phase enclosed busbar, and the air outlet of the fan is connected to the A-phase enclosed busbar and the C-phase enclosed busbar.

[0007] The inflation solenoid valve is installed on the air source pipeline connected to the inlet end of the drying system.

[0008] Temperature sensors are installed on the enclosed busbars of each phase.

[0009] The top of the control cabinet is equipped with an inlet connector for the drying system, which is connected to the inlet pipeline.

[0010] The humidity sensor is installed on the inlet pipe.

[0011] The cooling system is equipped with a water flow sensor.

[0012] The control cabinet is equipped with louvers.

[0013] The advantages of this utility model are:

[0014] (1) The air-filling solenoid valve, cooling system, drying system and PLC controller are centrally installed in a control cabinet, which makes the overall structure very compact, occupies little space and is easy to install and maintain. At the same time, due to the integrated design, each module can be arranged in the prefabricated cabin and the connecting pipes of each module can be arranged and connected in the prefabricated cabin. Therefore, during on-site installation, only the equipment and the enclosed busbar need to be connected at the inlet joint, which greatly simplifies the on-site installation workload and facilitates the transportation and rapid deployment of the equipment. It has the advantages of reliable structure, simple manufacturing, convenient transportation and easy on-site installation.

[0015] (2) By installing temperature sensors on each phase of the enclosed busbar, humidity sensors on the inlet pipe, and water flow sensors on the cooling system, and using a PLC controller for control, the real-time operating status of the enclosed busbar of the power plant is collected in real time through various sensors. Based on the temperature, humidity, pressure and other information during the operation of the busbar, the busbar pressure, temperature and humidity are adjusted in a timely manner to adjust the busbar operating status in real time and ensure that the busbar operates in the best state. The information detection is comprehensive and the detection data is accurate, thereby ensuring the long-term stable and reliable operation of the generator set, greatly extending the service life of the enclosed busbar, and ensuring good safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the integrated monitoring and control equipment for enclosed busbars of large generator sets according to this utility model.

[0017] Figure 2 This is a side view of the integrated monitoring and control device for the enclosed busbar of a large generator set according to this utility model.

[0018] Figure 3 This is a schematic diagram of the integrated monitoring and control device for the enclosed busbar of a large generator set according to this utility model. Detailed Implementation

[0019] The integrated monitoring and control equipment for large generator set enclosed busbars of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] As shown in the figure, the integrated monitoring and control equipment for the enclosed busbar of this utility model adopts a modular design and uses a prefabricated electrical equipment compartment. All modules are uniformly arranged inside the prefabricated compartment, with pre-installed connection joints on the compartment shell. It mainly monitors the operating status of the enclosed busbar in real time by installing sensors for temperature, humidity, pressure, and insulation. When abnormal operating parameters are detected, the various processing modules are activated promptly for adjustment to ensure the safe operation of the busbar. It includes an information acquisition unit for collecting information from each phase of the enclosed busbar 1 and a control cabinet 2 for centralized control. The control cabinet 2 centrally houses a solenoid valve 3 for controlling the supply of compressed gas to each phase of the enclosed busbar, a cooling system 6 consisting of a water-cooling system 4 and a heat exchanger 5, a drying system 9 consisting of a heater 7 and a molecular sieve 8, and a PLC controller as the control unit. Figure 3As can be seen, the information acquisition unit includes a temperature sensor 13 for collecting temperature information of the enclosed busbar, a humidity sensor 14 for collecting humidity information of the enclosed busbar, and a pressure sensor 15 for collecting pressure information of the enclosed busbar. The temperature, humidity, and pressure sensors are all connected to the PLC controller. The top of the control cabinet 2 is equipped with an inlet connector for the drying system; alternatively, it could also have a fan outlet connector and a gas source pipeline connector (mentioned later) for easy connection to various external pipelines. Phase B enclosed busbar 16 is connected to the inlet connector at the inlet end of the drying system 9 via inlet pipeline 11. The outlet end of the drying system 9 is connected to a fan 12 via the heat exchanger 5 of the cooling system. The outlet of the fan 12 is connected to phase A enclosed busbar 17 and phase C enclosed busbar 18. An air-filling solenoid valve 3 is installed on the gas source pipeline 19, which is connected to the inlet end of the drying system 9. The information acquisition unit collects the operating status information of each phase enclosed busbar 1. The system can process the collected information via a PLC controller, selectively activating the inflation solenoid valve for inflation, starting the drying system for drying, or activating the cooling system for cooling. Specifically: by monitoring the temperature of each phase of the enclosed busbar, when the temperature exceeds the set temperature, the cooling system is activated to extract hot air from inside the enclosed busbar using a centrifugal fan, cool it through a water-cooled heat exchanger, and then reintroduce it into the enclosed busbar, thus reducing its operating temperature; by monitoring the humidity of the enclosed busbar, when the humidity exceeds the set humidity, the enclosed busbar drying (dehumidification) system is activated to extract humid air from inside the enclosed busbar using a centrifugal fan, dry it through a molecular sieve, and then reintroduce it into the enclosed busbar, thus reducing its operating humidity and improving its insulation performance; by monitoring the pressure inside the enclosed busbar, when the pressure is lower than the set value, the enclosed busbar pressurization system is activated to inject compressed air into the enclosed busbar, maintaining an internal pressure higher than the external air pressure to prevent external humid air from entering the busbar.

[0021] Furthermore, temperature sensors are installed on phase A closed busbar 17, phase B closed busbar 16, and phase C closed busbar 18, humidity sensors are installed on the inlet pipe, and water flow sensor 20 is installed on the cooling system 6. In addition, pressure reducing valve, gas filter, and manual valve are installed sequentially on the gas source pipe 19 between the gas charging solenoid valve 3 and the gas source inlet.

[0022] Furthermore, in order to achieve good heat dissipation, louvers 21 can be installed on the control cabinet 2, and the fan is preferably a centrifugal fan.

[0023] Its working principle is as follows:

[0024] During normal operation, humidity, temperature, and pressure monitoring sensors are installed on the enclosed busbar. The data signals collected by the sensors are sent to the PLC controller in the centralized control cabinet. The PLC collects the operating status information of the enclosed busbar, such as temperature, humidity, and pressure, in real time and converts it into humidity, temperature, and pressure data during the operation of the enclosed busbar. When the pressure of the enclosed busbar is lower than the set lower pressure limit, the PLC controller activates the air-filling solenoid valve to fill the enclosed busbar with compressed air, causing the internal pressure of the enclosed busbar to rise. When the pressure exceeds the set upper pressure limit, the air-filling solenoid valve closes, stopping the air filling of the enclosed busbar. When the internal operating temperature of the enclosed busbar is higher than the set upper temperature limit, the enclosed busbar activates the fan and cooling system. The cooling system consists of a water cooling system and a heat exchanger. The fan draws the air from phase B of the enclosed busbar, cools it through the cooling system, and then sends it back to the busbar from phases A and C, continuously circulating to reduce air temperature. The internal air temperature of the enclosed busbar is controlled by the following mechanisms: when the internal temperature is below the set lower limit, the cooling system and fan of the enclosed busbar are stopped; when the internal air humidity is above the set upper limit, the fan and drying system of the enclosed busbar are activated. The drying system adsorbs moisture from the air through molecular sieves. The fan draws air from phase B of the enclosed busbar, dries it through the molecular sieves, and then sends it back to the busbar from phases A and C. This cycle is repeated to reduce the internal air humidity of the enclosed busbar. When the internal humidity is below the set lower limit, the busbar drying system and fan are stopped. Thus, when abnormal monitoring data is detected, the fan is activated in a timely manner to draw air from the busbar, which is then regulated by the drying system, water cooling system, and pressure regulator before being sent back to the busbar. This ensures that the enclosed busbar operates under good working conditions, thereby guaranteeing the reliable operation of the power plant's power generation system.

[0025] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An integrated monitoring and control device for enclosed busbars of large generator sets, characterized in that: It includes an information acquisition unit for collecting information from each phase closed bus (1) and a control cabinet (2) for centralized control. The control cabinet (2) is centrally equipped with an air filling solenoid valve (3) for controlling the air source to fill compressed gas into each phase closed bus, a cooling system (6) consisting of a water cooling system (4) and a heat exchanger (5), a drying system (9) consisting of a heater (7) and a molecular sieve (8), and a PLC controller as a control unit. One phase closed bus is connected to the inlet end of the drying system (9) through an inlet pipe (11), and the outlet end of the drying system (9) is also connected to a fan (12) through the heat exchanger (5) of the cooling system. The outlet of the fan (12) is connected to the other two phase closed buses.

2. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 1, characterized in that: The information acquisition unit includes a temperature sensor (13) for acquiring the temperature information of the enclosed busbar, a humidity sensor (14) for acquiring the humidity information of the enclosed busbar, and a pressure sensor (15) for acquiring the pressure information of the enclosed busbar. The temperature sensor, humidity sensor and pressure sensor are all connected to the PLC controller.

3. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 1 or 2, characterized in that: The drying system (9) is connected to the B-phase closed busbar (16), and the air outlet of the fan (12) is connected to the A-phase closed busbar (17) and the C-phase closed busbar (18).

4. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 3, characterized in that: The gas-filling solenoid valve (3) is installed on the gas source pipeline (19) connected to the inlet end of the drying system (9).

5. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 1, 2, or 4, characterized in that: Temperature sensors are installed on the closed busbar (1) of each phase.

6. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 5, characterized in that: The top of the control cabinet (2) is provided with an inlet connector for the drying system, which is connected to the inlet pipeline.

7. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 2, characterized in that: The humidity sensor is installed on the inlet pipe.

8. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 7, characterized in that: A water flow sensor (20) is installed on the cooling system (6).

9. The integrated monitoring and control equipment for enclosed busbars of large generator sets according to claim 8, characterized in that: The control cabinet (2) is equipped with louvers (21).

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