Low-voltage reactive compensation drawer type device for electric power system

Abstract

The invention relates to the technical field of low-voltage reactive compensation, in particular to a low-voltage reactive compensation drawer type device for an electric power system, which comprises a cabinet body, a main bus and a plurality of drawer units, and is characterized in that a drawer module comprises a drawer box, and a capacitor, a combination switch, a high-voltage fuse and a moving contact plug-in which are arranged in the drawer box and are electrically connected in series in sequence; when the drawer box is pushed into the cabinet body, the moving contact plug-in is electrically connected with the main bus, the cabinet body is provided with an intelligent compensation controller, the drawer box is provided with a secondary plug-in, the intelligent compensation controller and the secondary plug-in are connected with the combination switch through secondary wires and transmit control and detection signals, and when the drawer box is pushed into the cabinet body, the secondary plug-in is electrically communicated with the intelligent compensation controller. The device is connected with the intelligent compensation controller on the cabinet body through the secondary plug-in of the drawer module, parameters such as voltage, current and power factors of a power grid are monitored in real time, reactive power is accurately compensated according to the parameters, and the problem that an existing reactive power compensation device is lack of intelligent control is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage reactive power compensation, and in particular to a low-voltage reactive power compensation drawer device for a power system. Background Art

[0002] In AC circuits, reactive power, while not directly converted into useful work, is essential for maintaining electromagnetic fields and ensuring the proper operation of electrical equipment. However, excessive reactive power can lead to increased line losses and voltage drops, seriously impacting power supply quality and system stability. Traditional reactive power compensation methods have the following limitations: 1. Early reactive power compensation relied primarily on fixed capacitor banks or synchronous condensers. Fixed capacitor banks have slow response times and cannot quickly adapt to changes in reactive power in the grid. Their limited adjustment range prevents them from precisely meeting the reactive power requirements under varying operating conditions. Furthermore, these devices are expensive, imposing a significant financial burden on businesses when deployed on a large scale. 2. While synchronous condensers offer some effectiveness in reactive power compensation, they are bulky and complex to operate and maintain. Structural drawbacks of existing low-voltage reactive power compensation devices: 1. Traditional low-voltage reactive power compensation devices are mostly monolithic, lacking flexibility in the layout of their components. When a component fails, repair is complex, often requiring complete disassembly of the entire device, disrupting power supply and resulting in high repair costs. 2. The devices also lack scalability, making it difficult to flexibly adjust reactive power compensation capacity based on actual needs.

[0003] Existing low-voltage reactive power compensation devices have significant deficiencies in intelligent control, which are mainly reflected in the following aspects: Traditional devices are unable to monitor key parameters of the power grid (such as voltage, current, power factor, etc.) in real time, resulting in the inability to dynamically adjust reactive power compensation strategies and difficulty adapting to rapid changes in power grid load. Due to the lack of intelligent algorithm support, traditional devices are unable to accurately calculate the required amount of reactive power compensation and usually adopt a fixed group switching method, which can easily cause over-compensation or under-compensation, affecting the stability and energy efficiency of the power grid. Existing devices mostly rely on manual operation for switching control, which is not only inefficient, but also prone to equipment damage or unsatisfactory compensation effects due to human error. Traditional devices do not support networked remote monitoring, and operation and maintenance personnel cannot view the operating status in real time or remotely adjust the compensation strategy, which increases the difficulty and cost of operation and maintenance. Summary of the Invention

[0004] In response to the problems existing in the prior art, a low-voltage reactive power compensation drawer-type device for an electric power system is provided. The present invention relates to the technical field of low-voltage reactive power compensation, and specifically to a low-voltage reactive power compensation drawer-type device for an electric power system, which consists of a cabinet, a main bus and a plurality of drawer units. The drawer module includes a drawer box, as well as capacitors, composite switches, high-breakdown fuses and moving contact plug-ins arranged therein. The four are electrically connected in series in sequence. When the drawer box is pushed into the cabinet, the moving contact plug-in is electrically connected to the main bus. The cabinet is provided with an intelligent compensation controller, and the drawer box is provided with a secondary plug-in. The two are connected to the composite switch through a secondary wire to transmit control and detection signals. When the drawer box is pushed into the cabinet, the secondary plug-in is electrically connected to the intelligent compensation controller. The device is connected to the intelligent compensation controller on the cabinet through the secondary plug-in of the drawer module, monitors the grid voltage, current, power factor and other parameters in real time, and accurately compensates for reactive power according to the parameters, solving the problem of lack of intelligent control in existing reactive power compensation devices.

[0005] In order to solve the problems of the existing technology, the present invention provides a low-voltage reactive power compensation drawer-type device for an electric power system, comprising a cabinet body, a main busbar and several drawer units arranged in the cabinet body. The drawer module comprises a drawer box and a capacitor, a composite switch, a high-breakdown fuse and a moving contact plug-in arranged in the drawer box. The capacitor, the composite switch, the high-breakdown fuse and the moving contact plug-in are electrically connected in series in sequence. When the drawer box is pushed into the cabinet body, the moving contact plug-in is electrically connected to the main busbar. An intelligent compensation controller is also provided on the cabinet body, and a secondary plug-in is provided on the drawer box. A secondary wire for achieving electrical connection is provided between the secondary plug-in and the composite switch for transmitting control signals and detection signals. The secondary plug-in is electrically connected to the intelligent compensation controller when the drawer box is pushed into the cabinet body.

[0006] Preferably, the drawer module further comprises a reactor arranged in the drawer box, wherein the reactor is connected in series with the capacitor, the composite switch and the high-breakage fuse to form an electrical circuit.

[0007] Preferably, an operation indicator light is also provided on the drawer box.

[0008] Preferably, the intelligent compensation controller includes a microprocessor, which is used to calculate the required reactive compensation amount and control the switching of the drawer unit.

[0009] Preferably, a network communication module is also provided on the cabinet, and the network communication module is used for remote monitoring and management of the drawer unit.

[0010] Preferably, an air inlet and an air outlet are provided on the cabinet body, an exhaust fan is provided at the air outlet, and a dust collection mechanism is provided at the air inlet.

[0011] Preferably, the dust collection mechanism includes a collection box and a circulating filter belt. The collection box is arranged on the air inlet side, and the bottom of its inner cavity constitutes a dust collection chamber; the circulating filter belt is rotatably arranged in the collection box, one side of which forms a filter surface in contact with the air inlet, and the other side forms a dust discharge chamber connected to the dust collection chamber; an air inlet slot is provided on the top of the collection box, and the air inlet slot extends downward and abuts the back of the filter surface to form an air inlet channel.

[0012] Preferably, the dust collection mechanism further comprises a dust cleaning and rapping assembly arranged in the collection box, and when the filtering surface of the circulating filter belt rotates to the dust discharge cavity, the dust cleaning and rapping assembly rapps the inner side of the circulating filter belt.

[0013] Preferably, an air blowing port connected to the air inlet channel is provided on the side of the dust cleaning and rapping assembly facing the circulating filter belt, and when the dust cleaning and rapping assembly rapps the inner side of the circulating filter belt, the air blowing port blows air toward the inner side of the circulating filter belt.

[0014] Preferably, the dust collecting mechanism further comprises a dust box which can slide outward from the dust collecting cavity, and the top end of the dust box is open and faces the dust discharge cavity.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. Drawer-type structure design

[0017] The device adopts a modular drawer structure, and each drawer unit contains independent control circuits, capacitor banks, reactors (optional) and other components.

[0018] The drawer units work independently of each other. When a drawer unit fails, it can be pulled out for repair or replacement without affecting the normal operation of other units.

[0019] This structure makes the device small and compact. Under the same reactive compensation capacity, the floor space occupied is greatly reduced compared with the traditional integral structure device.

[0020] 2. Intelligent control system

[0021] Equipped with an advanced microprocessor control system, the system can monitor the voltage, current, power factor and other parameters of the power grid in real time.

[0022] Based on the monitored parameters, the required reactive power compensation amount is automatically calculated through an intelligent algorithm, and the corresponding drawer units are controlled to perform switching operations to achieve accurate compensation of reactive power.

[0023] At the same time, the system supports network remote monitoring and management. Operation and maintenance personnel can check the operating status of the device and adjust compensation strategies at any time through the network terminal, which improves the intelligence and automation level of the device.

[0024] 3. Flexible capacity adjustment

[0025] Due to the drawer-type modular design, the number of drawer units can be flexibly increased or decreased according to actual needs, thereby conveniently adjusting the capacity of the reactive compensation device.

[0026] When the grid load changes greatly or the reactive power demand fluctuates frequently, this flexible capacity adjustment capability can better meet the needs of the power system.

[0027] 4. This application achieves pre-treatment of external air by installing a dust collection mechanism at the cabinet air inlet. Before entering the cabinet, the external air must pass through the circulating filter belt to effectively block dust and other particulate matter, thereby preventing dust from entering the cabinet, ensuring the normal operation of the drawer unit (including capacitors, reactors, composite switches and other key components), and extending the service life of the equipment.

[0028] Furthermore, the dust collection mechanism incorporates a cleaning and vibrating assembly that periodically vibrates the circulating filter belt, effectively removing dust adhering to the belt, preventing clogging of the filter holes and maintaining stable filtration efficiency. This design not only improves the cabinet's dustproof performance but also reduces maintenance frequency and operating costs, further enhancing the reliability and environmental adaptability of the low-voltage reactive power compensation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The present invention is a system principle diagram of a low-voltage reactive power compensation drawer-type device for an electric power system.

[0030] Figure 2 It is a front view of a low-voltage reactive power compensation drawer device for a power system according to the present invention.

[0031] Figure 3 It is a side view of a low-voltage reactive power compensation drawer device for a power system according to the present invention.

[0032] Figure 4 The diagram is a schematic diagram of the internal structure of a drawer unit in a low-voltage reactive power compensation drawer device for an electric power system according to the present invention.

[0033] Figure 5 It is a three-dimensional diagram of a dust collection mechanism in a low-voltage reactive power compensation drawer device for an electric power system according to the present invention.

[0034] Figure 6 The present invention is a three-dimensional cross-sectional view of a dust collection mechanism in a low-voltage reactive power compensation drawer device for an electric power system.

[0035] Figure 7This is a schematic diagram of a dust collection mechanism in a low-voltage reactive power compensation drawer-type device for an electric power system according to the present invention, which is disassembled from a cabinet.

[0036] Figure 8 It is a three-dimensional exploded view of a dust collection mechanism in a low-voltage reactive power compensation drawer-type device for an electric power system according to the present invention.

[0037] Figure 9 The present invention is a three-dimensional diagram of a circulating filter belt in a low-voltage reactive power compensation drawer device for an electric power system.

[0038] Figure 10 It is a stereoscopic diagram of a dust cleaning and vibration component in a low-voltage reactive power compensation drawer-type device for an electric power system according to the present invention.

[0039] Figure 11 The present invention is a three-dimensional exploded view of a rapping head in a low-voltage reactive power compensation drawer-type device for an electric power system.

[0040] The numbers in the figure are: 1. Ammeter; 2. Voltmeter; 3. Temperature controller; 5. Voltage conversion switch; 6. Isolating knife fuse switch; 10. Branch busbar copper busbar; 12. Current transformer; 13. Vertical busbar copper busbar; 19. Cabinet; 191. Air inlet; 192. Air outlet; 11. Exhaust fan; 20. Primary conductor; 9. Main busbar; 8. Drawer box; 18. Capacitor; 17. Compound switch; 16. High-resolution fuse; 15. Moving contact plug-in; 14. Secondary plug-in; 21. Secondary conductor; 7. Indicator light; 4. Intelligent compensation controller; 22. Dust collection mechanism; 221. Collection box; 2211. Dust collector Dust collecting chamber; 2212, ash discharge chamber; 2213, air inlet slot; 2214, air inlet channel; 222, circulating filter belt; 223, rotating roller; 224, servo motor; 225, ash cleaning and rapping assembly; 2251, fixed rod; 2252, sliding frame; 2253, rapping head; 2254, air blowing port; 2255, air groove; 2257, buffer chamber; 2258, suction chamber; 2261, guide wheel; 2262, spring; 2263, abutment column; 2271, one-way air flow valve disc; 2272, piston; 2273, plug rod; 2274, hose; 2275, one-way valve; 228, dust box. DETAILED DESCRIPTION

[0041] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, a low-voltage reactive power compensation drawer device for a power system includes a cabinet 19, a main bus 9 arranged in the cabinet 19, and several drawer units. The drawer module includes a drawer box 8 and a capacitor 18, a compound switch 17, a high-breakdown fuse 16, and a moving contact plug-in 15 arranged in the drawer box 8. The capacitor 18, the compound switch 17, the high-breakdown fuse 16, and the moving contact plug-in 15 are electrically connected in series in sequence. When the drawer box 8 is pushed into the cabinet 19, the moving contact plug-in 15 is electrically connected to the main bus 9. An intelligent compensation controller 4 is also provided on the cabinet 19, and a secondary plug-in 14 is provided on the drawer box 8. A secondary wire 21 for achieving electrical connection is provided between the secondary plug-in 14 and the compound switch 17 for transmitting control signals and detection signals. The secondary plug-in 14 is electrically connected to the intelligent compensation controller 4 when the drawer box 8 is pushed into the cabinet 19.

[0043] An ammeter 1, a voltmeter 2, a temperature controller 3, a voltage conversion switch 5, an isolating knife-fuse switch 6, a branch busbar copper bar 10, a current transformer 12 and a vertical busbar copper bar 13 are also provided on the cabinet 19.

[0044] In the relevant architecture of the power capacitor 18 switching device, reasonable configuration and connection are carried out with the help of specific electrical components to construct a capacitor 18 drawer module with specific functions.

[0045] Specifically, the indicator light 7 for real-time display of the operating status of the equipment, the moving contact plug-in 15 as a key component for circuit on-off control (which can realize flexible connection and disconnection of the circuit to ensure reliable connection or exit of the capacitor 18 group under different working conditions), the high-break fuse as an important component for overcurrent protection of the circuit (when an abnormally large current appears in the circuit, it can quickly cut off the circuit to ensure the safety of the equipment and system), the composite switch 17 for controlling the switching operation of the capacitor 18 group (which can realize accurate and smooth switching of the capacitor 18 group, effectively reducing inrush current and overvoltage problems during the switching process), the capacitor 18 as the core energy storage element (used to store electrical energy and provide reactive compensation to the power grid when necessary), the main circuit primary conductor 20 for transmitting electrical energy (which undertakes the main task of transmitting electrical energy from the power supply to the capacitor 18 group) and the secondary conductor 21 for transmitting control signals, monitoring signals, etc. (which realizes the monitoring and control function of the operating status of the capacitor 18 group) are combined and assembled according to specific electrical connection methods and logical relationships to finally form a capacitor 18 drawer module.

[0046] The drawer module further includes a reactor disposed in the drawer box 8 , which is connected in series with the capacitor 18 , the composite switch 17 and the high-breakage fuse to form an electrical circuit.

[0047] Through series connection, the reactor can cooperate with the capacitor 18, the compound switch 17 and the high-breakage fuse to achieve effective control and regulation of current and voltage in the circuit to meet the operating requirements of the electrical system under different working conditions and ensure stable and reliable operation of the electrical system.

[0048] like Figure 4 As shown, the drawer box 8 is also provided with an operation indicator light 7.

[0049] When the electrical equipment within the drawer box 8 is operating normally, the operation indicator light 7 emits an indication signal of a specific color or flashing pattern according to preset logical rules, intuitively displaying the operating status of the equipment to the operator, facilitating timely and accurate understanding of the working status of the electrical equipment within the drawer box 8. Furthermore, the operation indicator light 7 is highly reliable and stable, adapting to the electrical environment of the drawer box 8 and reducing false indications caused by external interference, thereby providing a reliable status indication function for the stable operation and efficient management of the electrical system.

[0050] like Figure 2 As shown, the intelligent compensation controller 4 includes a microprocessor, which is used to calculate the required reactive compensation amount and control the switching of the drawer unit.

[0051] During operation, the microprocessor collects multiple key electrical parameters from the power system in real time, such as voltage, current, and power factor. Based on these collected electrical parameters, the microprocessor uses established reactive power compensation calculation models and algorithms to accurately calculate the reactive power compensation required by the power system. This calculation process involves complex mathematical operations and logical judgment to ensure the accuracy and timeliness of the results.

[0052] After calculating the reactive power compensation, the microprocessor generates control instructions based on the results. These instructions are precisely transmitted to the drawer units, enabling precise control of their switching operations. As key actuators of the reactive power compensation system, accurate control of the switching state of the drawer units is crucial for achieving reactive power balance in the power system, improving the power factor, reducing energy losses, and ensuring stable operation. Through precise control mechanisms, the microprocessor dynamically adjusts the switching on and off of the reactive power compensation devices, ensuring that the power system remains in optimal operating condition.

[0053] The cabinet 19 is also provided with a network communication module, which is used for remote monitoring and management of the drawer units.

[0054] During operation, the network communication module collects real-time operating parameters and status information from the drawer units. This information includes, but is not limited to, the voltage, current, power, temperature, and switch status of the electrical equipment within the drawer units. The network communication module performs preliminary processing and packaging on the collected raw data, converting it into a format suitable for network transmission.

[0055] The processed data is then accurately transmitted to a remote monitoring and management system via the established network communication link. Upon receiving the data, the remote monitoring and management system displays the real-time operating status of the drawer unit in an intuitive interface, allowing managers to obtain a timely and comprehensive understanding of the drawer unit's operating status from a remote location.

[0056] At the same time, managers can also send control commands to the network communication module through the remote monitoring and management system. After receiving the commands, the network communication module parses and verifies them, and accurately transmits them to the drawer unit, enabling remote control and management of the drawer unit, such as drawer unit switching control and parameter setting. In this way, the network communication module provides efficient, stable, and secure communication support for remote monitoring and management of the drawer unit, helping to improve the intelligent level of power system operation and management efficiency.

[0057] like Figure 3 、 Figure 5 and Figure 6 As shown, the cabinet 19 is provided with an air inlet 191 and an air outlet 192 , the air outlet 192 is provided with an exhaust fan 11 , and the air inlet 191 is provided with a dust collecting mechanism 22 .

[0058] The air inlet 191 serves as a passage for outside air to enter the cabinet 19, and a dust collection mechanism 22 is installed there. Designed based on efficient filtration and collection principles, this mechanism pre-treats the outside air entering the cabinet 19. This prevents dust from entering the cabinet 19 with the air and contaminating and damaging the electrical equipment and precision components within, thereby ensuring the normal operation and service life of the equipment.

[0059] The air outlet 192 is the channel for exhausting the air inside the cabinet 19, and an exhaust fan 11 is provided at the air outlet 192. The exhaust fan 11 has good ventilation performance and can generate a stable and strong airflow through rotation. At the same time, the exhaust fan 11 can also work in conjunction with the air inlet 191 to further enhance the air flow effect inside the cabinet 19, effectively adjust the temperature and humidity inside the cabinet 19, maintain a suitable operating environment, and improve the operating stability and reliability of the equipment inside the cabinet 19. Through the synergistic effect of the dust collection mechanism 22 of the air inlet 191 and the exhaust fan 11 of the air outlet 192, effective management and optimization of the air environment inside the cabinet 19 are achieved.

[0060] like Figure 7 、 Figure 8 and Figure 9 As shown, the dust collection mechanism 22 includes a collection box 221 and a circulating filter belt 222. The collection box 221 is arranged on the side of the air inlet 191, and the bottom of its inner cavity constitutes a dust collection chamber 2211; the circulating filter belt 222 is rotatably arranged in the collection box 221, one side of which forms a filter surface in contact with the air inlet 191, and the other side forms a dust discharge chamber 2212 connected to the dust collection chamber 2211; an air inlet slot 2213 is provided on the top of the collection box 221, and the air inlet slot 2213 extends downward and abuts the back of the filter surface to form an air inlet channel 2214.

[0061] The dust collection mechanism 22 also includes two rotating rollers 223 arranged in the collection box 221 and a servo motor 224 arranged on the collection box 221 and connected to the rollers 223. The circulating filter belt 222 is sleeved on the rollers 223 to form a filter belt in contact with the air inlet 191. The side of the circulating filter belt 222 opposite to the filter surface forms an ash discharge belt connected to the ash discharge chamber 2212.

[0062] Driven by the roller 223 , the circulating filter belt 222 can form a stable and continuous circulating motion path, always maintaining good contact between the filter surface and the air inlet 191 and effective communication between the ash discharge belt and the ash discharge chamber 2212 .

[0063] The bottom area of ​​the interior of collection box 221 is dedicated to forming dust collection chamber 2211. This chamber is a relatively independent and enclosed space designed to effectively contain and store dust particles filtered and separated from the air. Its shape, size, and volume are rationally designed to meet dust collection needs over a certain period of time, reducing the need for frequent cleaning.

[0064] The circulating filter belt 222 utilizes its own filtering characteristics to filter the incoming air, intercepting dust particles of different particle sizes to ensure that only clean air can enter the interior of the cabinet 19.

[0065] The other side of the circulating filter belt 222, opposite the filter surface, forms a dust discharge belt. This belt communicates with the dust collection chamber 2211, forming a dust discharge chamber 2212. As the circulating filter belt 222 rotates, dust adhering to the filter surface is transported to the dust discharge belt area as the belt moves. Within the dust discharge chamber 2212, air flow and gravity cause the dust to detach from the filter belt and fall into the dust collection chamber 2211 below, thereby collecting and cleaning the dust.

[0066] The air inlet slot 2213 is a downwardly extending structure, with its end tightly abutting the back of the filter surface, thereby forming a sealed and efficient air inlet channel 2214. After passing through the filter surface through the air inlet 191, the outside air will enter the cabinet 19 along the air inlet channel 2214.

[0067] like Figure 8 、 Figure 9 and Figure 10 As shown, the dust collection mechanism 22 also includes a dust cleaning and rapping assembly 225 arranged in the collection box 221. When the filtering surface of the circulating filter belt 222 rotates to the dust discharge chamber 2212, the dust cleaning and rapping assembly 225 rapps the inner side of the circulating filter belt 222.

[0068] The dust cleaning and rapping assembly 225 includes a fixed rod 2251, a sliding frame 2252, a rapping head 2253 and a guide wheel 2261. The fixed rod 2251 is fixedly set in the collection box 221, the sliding frame 2252 is slidably set in the collection box 221, the sliding frame 2252 is located at the bottom of the collection box 221, and the rapping heads 2253 are evenly spaced on the sliding frame 2252. The rapping heads 2253 extend longitudinally. A spring 2262 is provided between the rapping head 2253 and the fixed frame. When the rapping head 2253 rapps the circulating filter belt 222, it needs to overcome the elastic force of the spring 2262.

[0069] The guide wheel 2261 is coaxially fixedly arranged at the bottom end of the rotating roller 223. The circumferential surface of the guide wheel 2261 is provided with an arc groove distributed along its circumference. The sliding frame 2252 is provided with an abutment column 2263 that abuts on the circumferential surface of the guide wheel 2261. When the abutment column 2263 slides from the arc groove to the circumferential surface of the guide wheel 2261, the rapping head 2253 raps the inner side of the circulating filter belt 222.

[0070] When the roller 223 drives the guide wheel 2261 to rotate, the abutment post 2263 slides on the circumferential surface of the guide wheel 2261. As the abutment post 2263 slides from the arcuate groove to the circumferential surface of the guide wheel 2261, the change in position causes the sliding frame 2252 to move, causing the rapping head 2253 to overcome the elastic force of the spring 2262 and rap the inner side of the circulating filter belt 222. By utilizing the principle of mechanical transmission, the dust cleaning and rapping operation is automated and periodic, effectively improving the cleaning efficiency of the dust collection mechanism 22 and ensuring the continued effective filtering performance of the circulating filter belt 222.

[0071] like Figure 11 As shown, the dust cleaning and rapping component 225 is provided with an air blowing port 2254 connected to the air inlet channel 2214 on the side facing the circulating filter belt 222. When the dust cleaning and rapping component 225 rapps the inner side of the circulating filter belt 222, the air blowing port 2254 blows air toward the inner side of the circulating filter belt 222.

[0072] The rapping head 2253 is provided with an air blowing port 2254 on the side facing the circulating filter belt 222. The rapping head 2253 is provided with an air groove 2255, a buffer cavity 2257 and a suction cavity 2258 which are connected in sequence from top to bottom. The air groove 2255 is connected to the air blowing port 2254. The air groove 2255 and the buffer cavity 2257 are provided with a one-way air flow valve 2271. The one-way air flow valve 2271 only allows the air flow in the buffer cavity 2257 to enter the air groove 2254. 55. A piston 2272 is provided in the extraction chamber, a plug rod 2273 is provided between the piston 2272 and the fixed frame, a spring 2262 is sleeved on the plug rod 2273, and a hose 2274 extending into the air inlet channel 2214 is further provided in the suction chamber 2258. A one-way valve 2275 is provided at the connection between the hose 2274 and the suction chamber 2258. The one-way valve 2275 only allows the airflow in the air inlet channel 2214 to enter the suction chamber 2258.

[0073] When the dust cleaning and rapping assembly 225 performs a rapping operation on the inner side of the circulating filter belt 222 according to the preset working logic, the air blowing port 2254 will simultaneously deliver airflow to the inner side of the circulating filter belt 222. This collaborative operation of rapping and blowing is intended to more efficiently remove dust particles attached to the filter surface of the circulating filter belt 222 through the dual effects of mechanical rapping and airflow impact, thereby significantly improving the dust cleaning efficiency of the dust collection mechanism 22 and ensuring that the circulating filter belt 222 always has good filtering performance.

[0074] When the sliding frame 2252 approaches the fixed rod 2251, the piston 2272 squeezes the suction chamber 2258, and the piston 2272 squeezes the air in the suction chamber 2258 into the buffer chamber 2257. The air in the buffer chamber 2257 enters the air groove 2255 through the one-way airflow valve plate 2271 and is blown out through the air port 2254, thereby realizing backwashing of the circulating filter belt 222; when the sliding frame 2252 moves away from the fixed rod 2251, the piston 2272 moves away from the one-way valve 2275, and the pressure in the suction chamber 2258 decreases, so that the suction chamber 2258 draws the clean air in the air inlet channel 2214 through the one-way valve 2275 and into the suction chamber 2258, so that it can be blown out from the air port 2254 next time.

[0075] like Figure 7 As shown, the dust collecting mechanism 22 further includes a dust box 228 that can slide outward from the dust collecting cavity 2211 , and the top end of the dust box 228 is open and faces the dust discharge cavity 2212 .

[0076] The dust box 228 can effectively collect dust, making it convenient for the operator to discharge the accumulated dust from the cabinet 19 .

[0077] The above embodiments merely represent one or more embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, and such modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the appended claims.

Claims

1. A low-voltage reactive power compensation drawer device for a power system, comprising a cabinet, a main busbar disposed in the cabinet, and a plurality of drawer units. The drawer module comprises a drawer box, and capacitors, a composite switch, a high-frequency fuse, and a moving contact plug-in disposed in the drawer box. The capacitors, composite switch, high-frequency fuse, and moving contact plug-in are electrically connected in series. When the drawer box is pushed into the cabinet, the moving contact plug-in is electrically connected to the main busbar. The invention is characterized in that: The cabinet is also equipped with an intelligent compensation controller, and the drawer box is provided with a secondary plug-in. A secondary wire is provided between the secondary plug-in and the composite switch to achieve electrical connection, which is used to transmit control signals and detection signals. The secondary plug-in is electrically connected to the intelligent compensation controller when the drawer box is pushed into the cabinet.

2. A low-voltage reactive power compensation drawer device for a power system according to claim 1, characterized in that: The drawer module further includes a reactor arranged in the drawer box, wherein the reactor is connected in series with the capacitor, the composite switch and the high-break fuse to form an electrical circuit.

3. The low-voltage reactive power compensation drawer device for a power system according to claim 1, characterized in that: An operating indicator light is also provided on the drawer box.

4. The low-voltage reactive power compensation drawer device for a power system according to claim 1, characterized in that: The intelligent compensation controller comprises a microprocessor, which is used for calculating the required reactive power compensation amount and controlling the switching of the drawer units.

5. The low-voltage reactive power compensation drawer device for a power system according to claim 1, characterized in that: The cabinet is also provided with a network communication module, which is used for remote monitoring and management of the drawer unit.

6. A low-voltage reactive power compensation drawer device for a power system according to any one of claims 1 to 5, characterized in that: An air inlet and an air outlet are provided on the cabinet body. An exhaust fan is provided at the air outlet, and a dust collecting mechanism is provided at the air inlet.

7. A low-voltage reactive power compensation drawer device for a power system according to claim 6, characterized in that: The dust collection mechanism includes a collection box and a circulating filter belt. The collection box is arranged on the air inlet side, and the bottom of its inner cavity constitutes a dust collection chamber; the circulating filter belt is rotatably arranged in the collection box, one side of which forms a filter surface in contact with the air inlet, and the other side forms a dust discharge chamber connected to the dust collection chamber; an air intake slot is provided on the top of the collection box, and the air intake slot extends downward and abuts the back of the filter surface to form an air intake channel.

8. A low-voltage reactive power compensation drawer device for a power system according to claim 7, characterized in that: The dust collection mechanism also includes a dust cleaning and rapping assembly arranged in the collection box. When the filtering surface of the circulating filter belt rotates to the dust discharge cavity, the dust cleaning and rapping assembly rapps the inner side of the circulating filter belt.

9. A low-voltage reactive power compensation drawer device for a power system according to claim 8, characterized in that: An air blowing port connected to the air inlet channel is provided on the side of the dust cleaning and rapping assembly facing the circulating filter belt. When the dust cleaning and rapping assembly rapps the inner side of the circulating filter belt, the air blowing port blows air toward the inner side of the circulating filter belt.

10. The low-voltage reactive power compensation drawer device for a power system according to claim 7, characterized in that: The dust collecting mechanism further comprises a dust box which can slide outward from the dust collecting cavity, and the top end of the dust box is opened and faces the dust discharging cavity.

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