A low voltage reactive power compensation drawer for power systems

Abstract

The present application relates to the technical field of low-voltage reactive power compensation, and particularly relates to a low-voltage reactive power compensation drawer device for a power system, which is composed of a cabinet body, a main bus and a plurality of drawer units. The drawer unit comprises a drawer box, a capacitor, a composite switch, a high-fusing fuse and a movable contact plug, which are electrically connected in series. When the drawer box is pushed into the cabinet body, the movable contact plug is electrically connected with the main bus. The cabinet body is provided with an intelligent compensation controller, and the drawer box is provided with a secondary plug. The two are connected with the composite switch through secondary conductors to transmit control and detection signals. When the drawer box is pushed into the cabinet body, the secondary plug is electrically connected with the intelligent compensation controller. The device is connected with the intelligent compensation controller on the cabinet body through the secondary plug of the drawer unit, and can monitor parameters such as grid voltage, current and power factor in real time, and accurately compensate reactive power according to the parameters, thereby solving the problem of lack of intelligent control of existing reactive power compensation devices.

Description

Technical Field

[0001] This invention relates to the field of low-voltage reactive power compensation technology, specifically to a low-voltage reactive power compensation drawer-type device for power systems. Background Technology

[0002] In AC circuits, reactive power, while not directly converted into useful work, is indispensable for maintaining the electromagnetic field and ensuring the normal operation of electrical equipment. However, excessive reactive power can lead to increased line losses and voltage drops, seriously affecting power supply quality and the stability of the power system. Traditional reactive power compensation methods have the following limitations: 1. Early reactive power compensation mainly relied on fixed capacitor banks or synchronous condensers. Fixed capacitor banks have slow response speeds and cannot quickly adapt to changes in reactive power in the power grid. Their adjustment range is limited and cannot meet the precise requirements for reactive power compensation under different operating conditions. Moreover, these devices are expensive, placing a significant economic burden on enterprises when used on a large scale. 2. While synchronous condensers are effective in reactive power compensation, they suffer from large equipment size and complex operation and maintenance. Structural defects of existing low-voltage reactive power compensation devices: 1. Traditional low-voltage reactive power compensation devices are mostly monolithic structures, lacking flexibility in the layout of internal components. When a component fails, the repair process is complex, often requiring complete disassembly of the device, affecting normal power supply and incurring high repair costs. 2. The devices have poor scalability, making it difficult to flexibly adjust the reactive power compensation capacity according to actual needs.

[0003] Existing low-voltage reactive power compensation devices have significant shortcomings in intelligent control, mainly in the following aspects: Traditional devices cannot monitor key grid parameters (such as voltage, current, and power factor) in real time, resulting in an inability to dynamically adjust reactive power compensation strategies and difficulty in adapting to rapid changes in grid load. Due to the lack of intelligent algorithm support, traditional devices cannot accurately calculate the required reactive power compensation amount, typically employing a fixed group switching method, which easily leads to overcompensation or undercompensation, affecting grid stability and energy efficiency. Existing devices largely 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, preventing maintenance personnel from viewing operating status in real time or remotely adjusting compensation strategies, increasing maintenance difficulty and costs. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a low-voltage reactive power compensation drawer-type device for power systems. Specifically, it relates to the field of low-voltage reactive power compensation technology, and more specifically, to a low-voltage reactive power compensation drawer-type device for power systems. The device comprises a cabinet, a main busbar, and several drawer units. Each drawer unit includes a drawer box, and within it, capacitors, a composite switch, a high-voltage fuse, and a moving contact plug-in, all electrically connected in series. When the drawer box is pushed into the cabinet, the moving contact plug-in becomes electrically connected to the main busbar. The cabinet is equipped with an intelligent compensation controller, and the drawer box is equipped with a secondary plug-in. The two are connected to the composite switch via secondary wires to transmit control and detection signals. When the drawer box is pushed into the cabinet, the secondary plug-in becomes electrically connected to the intelligent compensation controller. This device connects to the intelligent compensation controller on the cabinet through the secondary plug-in of the drawer unit, monitoring grid voltage, current, power factor, and other parameters in real time, and accurately compensating reactive power based on these parameters, thus solving the problem of the lack of intelligent control in existing reactive power compensation devices.

[0005] To address the problems of existing technologies, this invention provides a low-voltage reactive power compensation drawer-type device for power systems, comprising a cabinet, a main busbar installed within the cabinet, and several drawer units. Each drawer unit includes a drawer box and capacitors, composite switches, high-resolution fuses, and moving contact plugs installed within the drawer box. The capacitors, composite switches, high-resolution fuses, and moving contact plugs are electrically connected in series. When the drawer box is pushed into the cabinet, the moving contact plugs are electrically connected to the main busbar. An intelligent compensation controller is also installed on the cabinet, and secondary plugs are installed on the drawer box. Secondary wires are installed between the secondary plugs and the composite switches to transmit control signals and detection signals. The secondary plugs are electrically connected to the intelligent compensation controller when the drawer box is pushed into the cabinet.

[0006] Preferably, the drawer unit further includes a reactor disposed inside the drawer box, the reactor being connected in series with a capacitor, a composite switch and a high breaking capacity fuse to form an electrical circuit.

[0007] Preferably, the drawer box is also equipped with an operation indicator light.

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

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

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

[0011] Preferably, the dust collection mechanism includes a collection box and a circulating filter belt. The collection box is located on the air inlet side, and the bottom of its inner cavity forms a dust collection chamber. The circulating filter belt is rotatably located inside the collection box, with one side forming a filter surface that contacts the air inlet and the other side forming a dust discharge chamber that communicates with the dust collection chamber. The top of the collection box is provided with an air inlet slot, which extends downward and abuts against the back of the filter surface to form an air inlet channel.

[0012] Preferably, the dust collection mechanism further includes a dust removal and vibration assembly disposed in the collection box. When the filter surface of the circulating filter belt rotates to the dust discharge chamber, the dust removal and vibration assembly vibrates the inner side of the circulating filter belt.

[0013] Preferably, the dust removal and vibration assembly has an air blowing port connected to the air inlet channel on the side facing the circulating filter belt. When the dust removal and vibration assembly vibrates the inner side of the circulating filter belt, the air blowing port blows air towards the inner side of the circulating filter belt.

[0014] Preferably, the dust collection mechanism further includes a dust box that can slide outward from the dust collection chamber, with the top of the dust box open and facing the dust discharge chamber.

[0015] The advantages of this application compared to the prior art are:

[0016] 1. Drawer-type structure design

[0017] This device adopts a modular drawer-type structure, with each drawer unit containing independent control circuits, capacitor banks, reactors (optional), and other components.

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

[0019] This structure makes the device small and compact, and with the same reactive power compensation capacity, it occupies a much smaller area compared to traditional integrated structure devices.

[0020] 2. Intelligent Control System

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

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

[0023] Meanwhile, the system supports remote network monitoring and management, allowing maintenance personnel to view the device's operating status and adjust compensation strategies at any time via network terminals, thus improving the device's intelligence and automation level.

[0024] 3. Flexible capacity adjustment

[0025] Thanks to its 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 power compensation device.

[0026] When there are large changes in grid load or frequent fluctuations in reactive power demand, this flexible capacity regulation capability can better meet the needs of the power system.

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

[0028] Furthermore, the integrated dust collection mechanism with its cleaning and rapping components periodically vibrates the circulating filter belt, efficiently removing dust adhering to it, preventing filter pore blockage, and maintaining stable filtration efficiency. This design not only improves the dustproof performance of the cabinet but also reduces maintenance frequency and operating costs, further enhancing the reliability and environmental adaptability of the low-voltage reactive power compensation device. Attached Figure Description

[0029] Figure 1 This is a system schematic diagram of a low-voltage reactive power compensation drawer-type device for power systems according to the present invention.

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

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

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

[0033] Figure 5 This is a perspective view of a dust collection mechanism in a low-voltage reactive power compensation drawer-type device for power systems according to the present invention.

[0034] Figure 6 This is a perspective sectional view of a dust collection mechanism in a low-voltage reactive power compensation drawer-type device for power systems according to the present invention.

[0035] Figure 7This is a schematic diagram of the dust collection mechanism being removed from the cabinet in a low-voltage reactive power compensation drawer-type device for power systems according to the present invention.

[0036] Figure 8 This is an exploded perspective view of a dust collection mechanism in a low-voltage reactive power compensation drawer-type device for power systems according to the present invention.

[0037] Figure 9 This is a perspective view of a circulating filter belt in a low-voltage reactive power compensation drawer-type device for power systems according to the present invention.

[0038] Figure 10 This is a perspective view of a dust removal and rapping assembly in a low-voltage reactive power compensation drawer-type device for power systems according to the present invention.

[0039] Figure 11 This is an exploded perspective view of the vibrating head in a drawer-type low-voltage reactive power compensation device for power systems according to the present invention.

[0040] The following are the components labeled in the diagram: 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. Composite 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... 2212 Dust collection chamber; 2213 Ash discharge chamber; 2214 Air inlet slot; 2215 Air inlet channel; 222 Circulating filter belt; 223 Rotary roller; 224 Servo motor; 225 Cleaning and rapping assembly; 2251 Fixed rod; 2252 Sliding frame; 2253 Rap 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 airflow valve; 2272 Piston; 2273 Plug rod; 2274 Hose; 2275 One-way valve; 228 Dust box. Detailed Implementation

[0041] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further 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-type device for a power system includes a cabinet 19, a main busbar 9 disposed in the cabinet 19, and several drawer units. Each drawer unit includes a drawer box 8 and a capacitor 18, a composite switch 17, a high-resolution fuse 16, and a moving contact plug-in 15 disposed in the drawer box 8. The capacitor 18, the composite switch 17, the high-resolution fuse 16, and the moving contact plug-in 15 are electrically connected in series. When the drawer box 8 is pushed into the cabinet 19, the moving contact plug-in 15 is electrically connected to the main busbar 9. An intelligent compensation controller 4 is also provided on the cabinet 19. A secondary plug-in 14 is provided on the drawer box 8. A secondary wire 21 is provided between the secondary plug-in 14 and the composite switch 17 to achieve electrical connection 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] The cabinet 19 is also equipped with an ammeter 1, a voltmeter 2, a temperature controller 3, a voltage conversion switch 5, an isolating knife fuse switch 6, a branch bus copper bus 10, a current transformer 12, and a vertical bus copper bus 13.

[0044] In the architecture of the power capacitor 18 switching device, specific electrical components are used to make reasonable configurations and connections to construct a capacitor 18 drawer unit with specific functions.

[0045] Specifically, the following components are combined and assembled according to specific electrical connection methods and logical relationships: indicator light 7 for real-time display of equipment operating status; moving contact plug 15, a key component for circuit on / off control (which enables flexible connection and disconnection of the circuit, ensuring reliable connection or disconnection of capacitor bank 18 under different operating conditions); high breaking capacity fuse, an important component for overcurrent protection of the circuit (which can quickly cut off the circuit when an abnormally large current occurs in the circuit, ensuring the safety of the equipment and system); composite switch 17 for controlling the switching operation of capacitor bank 18 (which enables precise and stable switching of capacitor bank 18, effectively reducing inrush current and overvoltage problems during the switching process); capacitor 18, a core energy storage component (used to store electrical energy and provide reactive power compensation to the grid when needed); primary conductor 20 of the main circuit for transmitting electrical energy (which undertakes the main task of transmitting electrical energy from the power source to capacitor bank 18); and secondary conductor 21 for transmitting control signals, monitoring signals, etc. (which realizes the monitoring and control function of the operating status of capacitor bank 18).

[0046] The drawer unit also 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 breaking capacity fuse to form an electrical circuit.

[0047] By connecting in series, the reactor can work with the capacitor 18, the composite switch 17 and the high breaking capacity fuse to effectively control and regulate the current and voltage in the circuit, so as to meet the operating requirements of the electrical system under different working conditions and ensure the stable and reliable operation of the electrical system.

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

[0049] When the electrical equipment inside drawer box 8 is in normal operation, the operation indicator 7 emits a specific color or flashing pattern indication signal according to preset logic rules, providing operators with a direct view of the equipment's operating status and facilitating timely and accurate understanding of the electrical equipment's working status within drawer box 8. Simultaneously, the operation indicator 7 possesses high reliability and stability, adapting to the electrical environment of drawer box 8 and reducing false indications caused by external interference, thus providing a reliable status indication function for the stable operation and efficient management of the electrical system.

[0050] like Figure X As shown, the intelligent compensation controller 4 includes a microprocessor, which is used to calculate the required reactive power 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 accurately calculates the amount of reactive power compensation currently required by the power system, according to a predetermined reactive power compensation calculation model and algorithm. This calculation process involves complex mathematical operations and logical judgments to ensure the accuracy and timeliness of the calculation results.

[0052] After calculating the reactive power compensation, the microprocessor generates corresponding control commands based on the calculation results. These control commands are precisely sent to the drawer unit, thereby achieving precise control over the switching operation of the drawer unit. As a crucial actuator of the reactive power compensation device, the accurate control of the drawer unit's switching status is of paramount importance for achieving reactive power balance in the power system, improving the power factor, reducing energy losses, and ensuring the stable operation of the power system. Through a precise control mechanism, the microprocessor can dynamically adjust the activation and deactivation of the reactive power compensation device, ensuring that the power system always remains in its optimal operating state.

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

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

[0055] Subsequently, the processed data is accurately transmitted to the remote monitoring and management system via the established network communication link. After receiving the data, the remote monitoring and management system can display the real-time operating status of the drawer unit in an intuitive interface, allowing managers to understand the working status of the drawer unit in a timely and comprehensive manner from a remote location.

[0056] Meanwhile, managers can also send control commands to the network communication module through the remote monitoring and management system. Upon receiving the commands, the network communication module parses and verifies them, then accurately transmits the commands to the drawer units, enabling remote control and management operations such as switching control and parameter settings. In this way, the network communication module provides efficient, stable, and secure communication for the remote monitoring and management of the drawer units, helping to improve the intelligence level and management efficiency of the power system.

[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. An exhaust fan 11 is provided at the air outlet 192, and a dust collection mechanism 22 is provided at the air inlet 191.

[0058] The air inlet 191 serves as the channel for outside air to enter the cabinet 19, and a dust collection mechanism 22 is installed there. This dust collection mechanism 22 is designed based on a high-efficiency filtration and collection principle, enabling pre-treatment of the outside air entering the cabinet 19. This prevents dust from entering the cabinet 19 with the air, thus avoiding contamination and damage to the electrical equipment and precision components inside the cabinet 19, and ensuring the normal operation and service life of the equipment.

[0059] The air outlet 192 serves as the channel for exhausting air from inside the cabinet 19, and an exhaust fan 11 is installed at this outlet 192. The exhaust fan 11 has excellent ventilation performance, generating a stable and strong airflow through rotation. Simultaneously, the exhaust fan 11 works in conjunction with the air inlet 191 to further enhance airflow within the cabinet 19, effectively regulating the temperature and humidity inside the cabinet 19, maintaining a suitable operating environment, and improving the operational stability and reliability of the equipment inside the cabinet 19. Through the synergistic effect of the dust collection mechanism 22 at the air inlet 191 and the exhaust fan 11 at 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 located on the side of the air inlet 191, and the bottom of its inner cavity forms a dust collection chamber 2211. The circulating filter belt 222 is rotatably disposed in the collection box 221, with one side forming a filter surface that contacts the air inlet 191, and the other side forming a dust discharge chamber 2212 that communicates with the dust collection chamber 2211. The top of the collection box 221 is provided with an air inlet slot 2213, which extends downward and abuts against 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 rotatably disposed in the collection box 221 and a servo motor 224 disposed on the collection box 221 and drivenly connected to the rotating rollers 223. The circulating filter belt 222 is sleeved on the rotating rollers 223 to form a filter belt that contacts the air inlet 191. The side of the circulating filter belt 222 opposite to the filter surface forms a dust discharge belt that communicates with the dust discharge chamber 2212.

[0062] Driven by the rotating 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 inner cavity of the collection box 221 is specifically designed to form a 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 planned to meet the dust collection needs within a certain period and reduce the frequency of cleaning.

[0064] The circulating filter belt 222 uses its own filtration characteristics to filter the incoming air. It intercepts dust particles of different sizes, ensuring that only clean air can enter the cabinet 19.

[0065] On the opposite side of the circulating filter belt 222 from the filter surface, a dust discharge belt is formed. This dust discharge belt is connected to the dust collection chamber 2211, forming a dust discharge chamber 2212. When the circulating filter belt 222 rotates, the dust adhering to the filter surface is transported to the dust discharge belt area as the belt moves. Inside the dust discharge chamber 2212, due to factors such as airflow and gravity, the dust detaches from the filter belt and falls into the dust collection chamber 2211 below, thus achieving dust collection and cleaning.

[0066] The air inlet 2213 has a downward-extending structure, with its end tightly abutting the back of the filter surface, thus forming a sealed and efficient air intake channel 2214. Outside air passes through the filter surface via the air inlet 191 and then enters the cabinet 19 along the air intake channel 2214.

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

[0068] The dust removal 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 installed in the collection box 221, and the sliding frame 2252 is slidably installed in the collection box 221. The sliding frame 2252 is located at the bottom of the collection box 221. The rapping heads 2253 are evenly spaced on the sliding frame 2252 and 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 fixed at the bottom end of the rotating roller 223. The circumferential surface of the guide wheel 2261 is provided with arc-shaped grooves distributed along its circumference. The sliding frame 2252 is provided with abutting post 2263 that abuts against the circumferential surface of the guide wheel 2261. When the abutting post 2263 slides from the arc-shaped groove to the circumferential surface of the guide wheel 2261, the vibrating head 2253 vibrates the inner side of the circulating filter belt 222.

[0070] When the rotating roller 223 drives the guide wheel 2261 to rotate, the abutment post 2263 slides on the circumferential surface of the guide wheel 2261. When the abutment post 2263 slides from the arc groove to the circumferential surface of the guide wheel 2261, the change in position pushes the sliding frame 2252 to displace, thereby causing the rapping head 2253 to overcome the elastic force of the spring 2262 and rappe the inner side of the circulating filter belt 222. By utilizing the principle of mechanical transmission, the dust removal rapping operation is automated and periodic, effectively improving the dust removal efficiency of the dust collection mechanism 22 and ensuring the continuous and effective filtration performance of the circulating filter belt 222.

[0071] like Figure 11 As shown, the dust removal and vibration assembly 225 is provided with an air blowing port 2254 communicating with the air inlet channel 2214 on the side facing the circulating filter belt 222. When the dust removal and vibration assembly 225 vibrates the inner side of the circulating filter belt 222, the air blowing port 2254 blows air towards the inner side of the circulating filter belt 222.

[0072] The vibrating head 2253 has an air outlet 2254 on the side facing the circulating filter belt 222. The vibrating head 2253 has, from top to bottom, a sequentially connected air groove 2255, a buffer chamber 2257, and a suction chamber 2258. The air groove 2255 is connected to the air outlet 2254. A one-way airflow valve 2271 is provided between the air groove 2255 and the buffer chamber 2257, allowing only the airflow from the buffer chamber 2257 to enter the air groove 2255. A piston 2272 is provided in the suction chamber 2258. A stopper rod 2273 is provided between the piston 2272 and the fixed frame. A spring 2262 is sleeved on the stopper rod 2273. A hose 2274 extending into the air intake channel 2214 is also 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 intake channel 2214 to enter the suction chamber 2258.

[0073] When the dust removal and vibration assembly 225 performs vibration operation on the inner side of the circulating filter belt 222 according to the preset working logic, the air blowing port 2254 simultaneously delivers airflow to the inner side of the circulating filter belt 222. This method of coordinated vibration and air blowing aims to remove dust particles attached to the filter surface of the circulating filter belt 222 more efficiently through the dual action of mechanical vibration and airflow impact, thereby significantly improving the dust removal efficiency of the dust collection mechanism 22 and ensuring that the circulating filter belt 222 always has good filtration performance.

[0074] When the sliding frame 2252 approaches the fixed rod 2251, the piston 2272 squeezes the suction chamber 2258, forcing 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 outlet 2254, achieving 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, causing the suction chamber 2258 to draw clean air from the air intake channel 2214 through the one-way valve 2275 and into the suction chamber 2258, so that it can be blown out from the air outlet 2254 next time.

[0075] like Figure 7 As shown, the dust collection mechanism 22 also includes a dust box 228 that can slide outward from the dust collection chamber 2211, with the top of the dust box 228 open and facing the dust discharge chamber 2212.

[0076] Dust can be effectively collected through the dust box 228, making it easy for operators to remove the accumulated dust from the cabinet 19.

[0077] The above embodiments only illustrate one or more implementations 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 those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A low-voltage reactive power compensation drawer device for a power system, comprising a cabinet body and a main busbar and a plurality of drawer units arranged in the cabinet body, the drawer unit comprising a drawer box and a capacitor, a compound switch, a high-dividing fuse and a moving contact plug arranged in the drawer box, the capacitor, the compound switch, the high-dividing fuse and the moving contact plug are electrically connected in series, when the drawer box is pushed into the cabinet body, the moving contact plug is electrically connected with the main busbar, characterized in that, The smart compensation controller is arranged on the cabinet body, the secondary plug-in is arranged on the drawer box, the secondary plug-in and the composite switch are provided with secondary wires for realizing electrical connection, and the secondary wires are used for transmitting control signals and detection signals; the secondary plug-in realizes electrical connection with the smart compensation controller when the drawer box is pushed into the cabinet body; An air inlet and an air outlet are arranged on the cabinet body, an exhaust fan is arranged at the air outlet, and a dust collecting mechanism is arranged at the air inlet; The dust collecting mechanism comprises a collecting box and a circulating filter belt; the collecting box is arranged at the air inlet side, and a dust collecting cavity is formed at the bottom of the inner cavity of the collecting box; the circulating filter belt is rotatably arranged in the collecting box, one side of the circulating filter belt forms a filter surface in contact with the air inlet, and the other side of the circulating filter belt forms a dust discharging cavity in communication with the dust collecting cavity; an air inlet slot is arranged at the top of the collecting box, the air inlet slot extends downward and abuts against the back of the filter surface to form an air inlet channel; The dust collecting mechanism further comprises a dust cleaning and shaking assembly arranged in the collecting box; when the filter surface of the circulating filter belt rotates to the dust discharging cavity, the dust cleaning and shaking assembly shakes the inner side of the circulating filter belt. The dust cleaning and shaking assembly comprises a fixed rod, a sliding frame, a shaking head and a guide wheel; the fixed rod is fixedly arranged in the collecting box; the sliding frame is slidably arranged in the collecting box; the sliding frame is located at the bottom of the collecting box; the shaking head is equidistantly arranged on the sliding frame; the shaking head extends longitudinally; a spring is arranged between the shaking head and the fixed frame; the shaking head needs to overcome the elastic force of the spring when shaking the circulating filter belt; The dust collecting mechanism further comprises two rotating rollers arranged in the collecting box and a servo motor arranged on the collecting box and in transmission connection with the rotating rollers; the circulating filter belt is sleeved on the rotating rollers to form a filter belt in contact with the air inlet; one side of the circulating filter belt opposite to the filter surface forms a dust discharging belt in communication with the dust discharging cavity. The guide wheel is coaxially and fixedly arranged at the bottom end of the rotating roller; an arc-shaped groove is arranged on the circumferential surface of the guide wheel and distributed along the circumferential direction of the guide wheel; an abutting column is arranged on the sliding frame and abuts against the circumferential surface of the guide wheel; when the abutting column slides from the arc-shaped groove to the circumferential surface of the guide wheel, the shaking head shakes the inner side of the circulating filter belt. One side of the shaking head facing the circulating filter belt is provided with a blowing port; a gas slot, a buffer cavity and a suction cavity are sequentially arranged in the shaking head from top to bottom; the gas slot is in communication with the blowing port; the gas slot and the buffer cavity are provided with a one-way air flow valve; the one-way air flow valve only allows the air flow in the buffer cavity to enter the gas slot; a piston is arranged in the suction cavity; a plug rod is arranged between the piston and the fixed frame; a spring is sleeved on the plug rod; a hose is arranged in the suction cavity and extends into the air inlet channel; a one-way valve is arranged at the connection between the hose and the suction cavity; the one-way valve only allows the air flow in the air inlet channel to enter the suction cavity.

2. A low voltage reactive power compensation drawer for power systems according to claim 1, characterized in that, The drawer unit further comprises an electric reactor arranged in the drawer box; the electric reactor is connected in series with the capacitor, the composite switch and the high-break fuse to form an electric circuit.

3. A low voltage reactive power compensation drawer for power systems according to claim 1, characterized in that, The drawer box is further provided with a running indicator.

4. A low voltage reactive power compensation drawer for power systems as claimed in claim 1, wherein, The smart compensation controller comprises a microprocessor; the microprocessor is used for calculating the required reactive compensation amount and controlling the switching of the drawer unit.

5. A low voltage reactive power compensation drawer for power systems as claimed in claim 1, wherein, The cabinet body is further provided with a network communication module; the network communication module is used for remotely monitoring and managing the drawer unit.

6. A low voltage reactive power compensation drawer for power systems as claimed in claim 1, wherein, The dust cleaning and shaking assembly is provided with a blowing port communicated with the air inlet channel on the side facing the circulating filter belt, and the blowing port blows air towards the inner side of the circulating filter belt when the dust cleaning and shaking assembly shakes the inner side of the circulating filter belt.

7. A low voltage reactive power compensation drawer for power systems as claimed in claim 1, wherein, The dust collecting mechanism further comprises a dust box capable of sliding outwards from the dust collecting cavity, and the top end of the dust box is open and faces the dust discharging cavity.

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