A reverse power protection mechanical actuator

Abstract

The utility model discloses a kind of reverse power protection mechanical actuators, including main component, the main component includes mounting seat, fixed frame, current transformer, voltage transformer, installation box, control mainboard, signal acquisition module, signal processing module, comparison module, control module and circuit breaker.The utility model acquires current and voltage signal in circuit in real time by current transformer and voltage transformer, and it is sequentially transmitted to signal acquisition module, signal processing module and comparison module to signal is handled and compared, once it is judged that reverse power occurs, control module can control audible and visual annunciator to send alarm signal and trigger circuit breaker action in extremely short time, and timely cut off circuit;Signal is amplified, filtered and other fine processing by signal processing module, improve the quality and accuracy of signal, so that comparison module can more accurately judge whether reverse power occurs, effectively avoid the situation of misjudgment and missing.

Description

Technical Field

[0001] This utility model relates to the technical field of reverse power protection equipment, specifically a reverse power protection mechanical actuator. Background Technology

[0002] Reverse power refers to a situation in a power system where the direction of power output from generators or other power generation equipment changes, from normally supplying power to the grid to absorbing power from the grid. This phenomenon can be caused by various reasons, such as a generator prime mover failure (e.g., interruption of steam supply to a steam turbine, reduced water flow to a water turbine), causing the generator to lose its driving force and instead be driven by the grid to rotate, thus absorbing active power from the grid; or in distributed generation systems, when photovoltaic panels receive insufficient sunlight or wind turbines operate at low wind speeds, resulting in power generation less than the load power, reverse power can also occur.

[0003] Existing reverse power protection devices have some shortcomings. On the one hand, some devices have slow response speeds and cannot react quickly enough when reverse power occurs, resulting in the power generation equipment and power system still being subjected to the hazards caused by reverse power during this period. On the other hand, existing devices lack accuracy in protection, and may misjudge or miss detections. For example, in some complex power environments, when a brief power fluctuation occurs, the device may mistakenly identify it as reverse power and take protective action, leading to unnecessary power outages; or when real reverse power occurs, the device may fail to detect it in time due to insufficient sensitivity, thus failing to activate the protection mechanism in a timely manner. To address these issues, a reverse power protection mechanical actuator is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a reverse power protection mechanical actuator to solve one of the problems mentioned in the background art.

[0005] This utility model is implemented by the following technical solution: a reverse power protection mechanical actuator, including a main body assembly, the main body assembly including a mounting base, a fixing frame, a current transformer, a voltage transformer, a mounting box, a control main board, a signal acquisition module, a signal processing module, a comparison module, a control module, and a circuit breaker;

[0006] A mounting bracket is fixedly connected to one side of the front surface of the mounting base. A current transformer and a voltage transformer are installed on one side of the mounting bracket. A mounting box is fixedly connected to the front surface of the mounting bracket. A control main board is installed inside the mounting box. A signal acquisition module, a signal processing module, a comparison module, and a control module are installed on the front surface of the control main board. The output terminals of the current transformer and the voltage transformer are electrically connected to the input terminal of the signal acquisition module. The output terminal of the signal acquisition module is electrically connected to the input terminal of the signal processing module. The output terminal of the signal processing module is electrically connected to the input terminal of the comparison module. The output terminal of the comparison module is electrically connected to the input terminal of the control module. A circuit breaker is installed on the other side of the front surface of the mounting base. The output terminal of the control module is electrically connected to the input terminal of the circuit breaker.

[0007] As a further preferred embodiment of this technical solution: the front surface of the circuit breaker is provided with an operating handle, and the top and bottom of the circuit breaker are provided with terminals.

[0008] As a further preferred embodiment of this technical solution: a sealing cover is fixedly connected to the front surface of the mounting box, and an audible and visual alarm is fixedly connected to the front surface of the sealing cover. The input terminal of the audible and visual alarm is electrically connected to the output terminal of the control module.

[0009] As a further preferred embodiment of this technical solution: heat dissipation grooves are provided in the middle of both sides of the mounting box, and dustproof nets are fixedly connected to the inner sidewalls of the heat dissipation grooves.

[0010] As a further preferred embodiment of this technical solution: an indicator light is provided on the front surface of the circuit breaker near the operating handle.

[0011] As a further preferred embodiment of this technical solution, the top and bottom of the mounting box are provided with multiple wire-passing holes.

[0012] As a further preferred embodiment of this technical solution, a shock-absorbing and anti-slip pad is fixedly connected to the rear surface of the mounting base.

[0013] As a further preferred embodiment of this technical solution, mounting holes are provided at the four corners of the upper surface of the mounting base and the shock-absorbing and anti-slip pad.

[0014] Advantages of this utility model:

[0015] 1. This utility model collects current and voltage signals in the circuit in real time through current transformers and voltage transformers, and transmits them sequentially to the signal acquisition module, signal processing module and comparison module for signal processing and comparison. Once reverse power is detected, the control module can control the audible and visual alarm to issue an alarm signal and trigger the circuit breaker to cut off the circuit in a very short time, thereby effectively protecting the power generation equipment and power system. Compared with traditional devices, the response speed is greatly improved.

[0016] 2. This utility model uses a signal processing module to amplify and filter the signal, which improves the signal quality and accuracy. This allows the comparison module to more accurately determine whether reverse power has occurred, effectively avoiding misjudgment and missed judgment. Compared with existing devices, it significantly improves the accuracy of protection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model from one perspective;

[0019] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0020] Figure 3 This is a schematic diagram of the mounting box and signal processing module structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the control motherboard and signal acquisition module of this utility model.

[0022] In the diagram: 1. Main component; 11. Mounting base; 12. Fixing frame; 13. Current transformer; 14. Voltage transformer; 15. Mounting box; 16. Control main board; 17. Signal acquisition module; 18. Signal processing module; 19. Comparison module; 20. Control module; 21. Circuit breaker; 22. Operating handle; 23. Terminal block; 24. Sealing cover; 25. Audible and visual alarm; 26. Heat dissipation slot; 27. Dustproof net; 28. Indicator light; 29. ​​Wiring hole; 30. Shock-absorbing and anti-slip pad; 31. Mounting hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] Please see Figures 1-4This utility model provides a technical solution: a reverse power protection mechanical actuator, including a main component 1, which includes a mounting base 11, a fixing frame 12, a current transformer 13, a voltage transformer 14, a mounting box 15, a control main board 16, a signal acquisition module 17, a signal processing module 18, a comparison module 19, a control module 20, and a circuit breaker 21.

[0026] A mounting bracket 12 is fixedly connected to one side of the front surface of the mounting base 11. A current transformer 13 and a voltage transformer 14 are installed on one side of the mounting bracket 12. A mounting box 15 is fixedly connected to the front surface of the mounting bracket 12. A control main board 16 is installed inside the mounting box 15. A signal acquisition module 17, a signal processing module 18, a comparison module 19, and a control module 20 are installed on the front surface of the control main board 16. The output terminals of the current transformer 13 and the voltage transformer 14 are electrically connected to the input terminal of the signal acquisition module 17. The output terminal of the signal acquisition module 17 is electrically connected to the input terminal of the signal processing module 18. The output terminal of the signal processing module 18 is electrically connected to the input terminal of the comparison module 19. The output terminal of the comparison module 19 is electrically connected to the input terminal of the control module 20. A circuit breaker is installed on the other side of the front surface of the mounting base 11. 21. The output terminal of the control module 20 is electrically connected to the input terminal of the circuit breaker 21. A current transformer 13 is mounted on the main circuit cable to collect current signals (including phase and amplitude). A voltage transformer 14 is connected in parallel across the circuit to collect voltage signals (including phase and amplitude). The collected current and voltage signals are transmitted to the signal acquisition module 17 via the current transformer 13 and voltage transformer 14. The signal acquisition module 17 then amplifies and filters the current and voltage signals. The signal processing module 18 digitizes the analog signal and calculates power parameters (such as active power and power direction). The comparison module 19 compares the calculation results with a preset threshold and outputs a reverse power trigger signal to the control module 20. The control module 20 simultaneously triggers the circuit breaker 21 to open and the audible and visual alarm 25 to sound an alarm.

[0027] In this embodiment, specifically: an operating handle 22 is provided on the front surface of the circuit breaker 21, and terminals 23 are provided on the top and bottom of the circuit breaker 21; by manually operating the operating handle 22, the circuit breaker 21 can be closed (circuit connected) or opened (circuit disconnected); in the closed state, the handle is turned to one side (e.g., the "ON" position), the internal moving contact and stationary contact close, the main circuit is connected, and the power generation equipment is normally connected to the power grid; in the open state, the handle is turned to the other side (e.g., the "OFF" position), the contacts separate, the circuit is disconnected, and it is used for fault protection or manual power disconnection; when the control module 20 detects a reverse power fault, the internal tripping mechanism of the circuit breaker 21 is driven by electromagnetic force, and the operating handle 22 automatically springs to the open position without manual intervention;

[0028] The terminal 23 at the top of the circuit breaker 21 is used to connect the power grid input cable (incoming line) to introduce the power grid into the circuit breaker 21; the terminal 23 at the bottom of the circuit breaker 21 is used to connect the power generation equipment output cable (outgoing line) to transmit the power generation equipment to the power grid; the terminal 23 is connected to the contacts of the circuit breaker 21 through a conductive copper busbar to ensure the reliability of high current conduction (the rated current can be designed to be 100A-630A or other specifications according to the application scenario).

[0029] In this embodiment, specifically: a sealing cover 24 is fixedly connected to the front surface of the mounting box 15, and an audible and visual alarm 25 is fixedly connected to the front surface of the sealing cover 24. The input terminal of the audible and visual alarm 25 is electrically connected to the output terminal of the control module 20. The sealing cover 24 is fixed to the front surface of the mounting box 15 by bolts or clips, forming a closed protective enclosure for the internal components of the mounting box 15 (such as the control motherboard 16, signal acquisition module 17, etc.). The audible and visual alarm 25 has a built-in red LED light; when it receives a trigger signal from the control module 20, the LED light flashes at a high frequency (e.g., once per second). It can be identified from a distance in dimly lit environments; at the same time, the audible and visual alarm 25 integrates a buzzer, which emits a continuous or intermittent buzzing sound (volume of about 70-90 decibels), with strong penetration, which can attract the attention of operators in noisy environments; since the input terminal of the audible and visual alarm 25 is electrically connected to the output terminal of the control module 20 through a wire, when the control module 20 determines that a reverse power fault has occurred and triggers the circuit breaker 21 to open, it simultaneously sends a high-level signal to the audible and visual alarm 25 to start the alarm; after the fault is cleared and the circuit breaker 21 is reset, the control module 20 cuts off the signal and the alarm stops.

[0030] In this embodiment, specifically: heat dissipation slots 26 are provided in the middle of both sides of the mounting box 15, and dustproof nets 27 are fixedly connected to the inner sidewalls of the heat dissipation slots 26. The heat dissipation slots 26 on both sides of the mounting box 15 facilitate natural air convection, reduce the operating temperature of the control motherboard 16 and each module, and thus avoid component failure due to overheating; by covering the inside of the heat dissipation slots 26 with dustproof nets 27, dust and moisture are prevented from entering the interior of the mounting box 15, ensuring the long-term stable operation of electronic components.

[0031] In this embodiment, specifically: a signal light 28 is provided on the front surface of the circuit breaker 21 near the operating handle 22; when the circuit breaker 21 is in the closed state (circuit is connected), the signal light 28 displays green, indicating that the system is fault-free and working normally; when a reverse power fault triggers the circuit breaker 21 to open, the signal light 28 automatically switches to red, intuitively prompting the operator that "the circuit has been disconnected" and "reverse power protection has been activated"; by working in conjunction with the signal light 28 and the audible and visual alarm 25, the actuator that has experienced a reverse power fault can be quickly located, shortening the manual troubleshooting time.

[0032] In this embodiment, specifically: A plurality of wire passing holes 29 are provided at the top and bottom of the installation box 15. Through the wire passing holes 29, it is convenient for wires to penetrate into the installation box 15. At the same time, it is convenient to sort out the connection leads of the current transformer 13 and the voltage transformer 14, the control cables, and the connection wires of the circuit breaker 21, avoiding the mess of the cables and affecting maintenance.

[0033] In this embodiment, specifically: A shock-absorbing and anti-slip pad 30 is fixedly connected to the rear surface of the mounting seat 11. The shock-absorbing and anti-slip pad 30 made of rubber absorbs external vibrations, thereby ensuring the mechanical structure of the actuator remains stable in a vibrating environment (such as a generator room).

[0034] In this embodiment, specifically: Mounting holes 31 are provided at the four corners of the upper surfaces of the mounting seat 11 and the shock-absorbing and anti-slip pad 30. Through the mounting holes 31, it is convenient to fix the mounting seat 11 using bolts.

[0035] During the working principle or structural principle, when in use, the actuator is fixed to the target position (such as a generator control cabinet or a power grid distribution cabinet) through the shock-absorbing and anti-slip pad 30 on the rear surface of the mounting seat (11), and is fastened with bolts through the mounting holes 31 at the four corners; the top and bottom terminal posts 23 of the circuit breaker 21 are respectively connected to the output end of the power generation equipment and the input end of the power grid, forming a main circuit path; at this time, the circuit breaker 21 is in the closed state, the operating handle 22 is in the closed position, and the signal lamp 28 shows green (normal operation); the current transformer 13 is sleeved on the main circuit cable to monitor the current signal (including phase and amplitude) in real time; the voltage transformer 14 is connected in parallel at both ends of the circuit to monitor the voltage signal (including phase and amplitude); the current signal and the voltage signal are transmitted to the signal acquisition module 17 in the installation box 15 through wires to complete the preliminary conditioning of the analog signal (such as amplification and noise reduction); the signal processing module 18 receives the output signal of the signal acquisition module 17, performs analog-to-digital conversion (A / D conversion) and calculates the key parameters. The specific calculation and determination process is as follows:

[0036] The active power P = UIcosθ, where θ is the phase difference between the voltage and the current;

[0037] The power direction is judged by θ; when the power generation equipment supplies power normally, θ corresponds to the forward power; when there is reverse power, θ flips and P is negative;

[0038] The comparison module 19 compares the calculated power parameters with the preset thresholds (such as the reverse power action value P_set = -5kW and the delay time t_set = 0.5s):

[0039] If it is continuously monitored that P < P_set and the time exceeds t_set, it is determined as a reverse power failure, and a trigger signal is sent to the control module 20;

[0040] If it is a short-term fluctuation (such as P≥P_set or the duration <t_set), it is determined to be in a normal state and the protection is not triggered;

[0041] After the control module 20 receives the reverse power trigger signal, it immediately outputs an electrical signal to the tripping coil of the circuit breaker 21, driving the internal mechanical mechanism of the circuit breaker 21 to act, causing the operating handle 22 to automatically spring to the "open" position, disconnecting the main circuit contacts, cutting off the connection between the power generation equipment and the power grid, and preventing the continuous flow of reverse power; the signal lamp 28 changes from green to red, visually indicating the fault tripping state; the control module 20 simultaneously sends a signal to the audible and visual alarm 25 on the sealing cover 24, and the audible and visual alarm 25 emits a red flash and a beeping sound, with the alarm range covering the surrounding area of the equipment, prompting the staff to check the fault in time; the operator locates the faulty equipment based on the audible and visual alarm, and confirms that the reverse power protection action has been triggered through the signal lamp 28 on the circuit breaker 21 and the status of the installation box 15; check the power generation equipment (such as the steam supply of the steam turbine, the light condition of the photovoltaic panel, etc.), and eliminate the causes of reverse power (such as repairing the prime mover fault, adjusting the operating state of the distributed power source); after the fault is eliminated, the operator manually turns the operating handle 22 of the circuit breaker 21 back to the "closed" position to complete the mechanical reset, the contacts of the circuit breaker 21 close, the main circuit resumes conduction, the signal lamp 28 shows green again, the audible and visual alarm 25 stops alarming, and the system returns to the initial monitoring state.

[0042] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reverse power protection mechanical actuator, characterized in that, The main component (1) includes a mounting base (11), a fixing frame (12), a current transformer (13), a voltage transformer (14), a mounting box (15), a control main board (16), a signal acquisition module (17), a signal processing module (18), a comparison module (19), a control module (20), and a circuit breaker (21). A mounting bracket (12) is fixedly connected to one side of the front surface of the mounting base (11). A current transformer (13) and a voltage transformer (14) are provided on one side of the mounting bracket (12). A mounting box (15) is fixedly connected to the front surface of the mounting bracket (12). A control main board (16) is installed inside the mounting box (15). A signal acquisition module (17), a signal processing module (18), a comparison module (19), and a control module (20) are provided on the front surface of the control main board (16). The current transformer (13) and the voltage transformer... The output terminal of (14) is electrically connected to the input terminal of the signal acquisition module (17). The output terminal of the signal acquisition module (17) is electrically connected to the input terminal of the signal processing module (18). The output terminal of the signal processing module (18) is electrically connected to the input terminal of the comparison module (19). The output terminal of the comparison module (19) is electrically connected to the input terminal of the control module (20). A circuit breaker (21) is installed on the other side of the front surface of the mounting base (11). The output terminal of the control module (20) is electrically connected to the input terminal of the circuit breaker (21).

2. The reverse power protection mechanical actuator according to claim 1, characterized in that, The circuit breaker (21) is provided with an operating handle (22) on its front surface, and terminal blocks (23) are provided on the top and bottom of the circuit breaker (21).

3. The reverse power protection mechanical actuator according to claim 1, characterized in that, A sealing cover (24) is fixedly connected to the front surface of the mounting box (15), and an audible and visual alarm (25) is fixedly connected to the front surface of the sealing cover (24). The input terminal of the audible and visual alarm (25) is electrically connected to the output terminal of the control module (20).

4. A reverse power protection mechanical actuator according to claim 3, characterized in that, The mounting box (15) has heat dissipation grooves (26) in the middle of both sides, and the inner sidewall of the heat dissipation grooves (26) is fixedly connected with a dustproof net (27).

5. A reverse power protection mechanical actuator according to claim 1, characterized in that, The circuit breaker (21) has an indicator light (28) on the front surface near the operating handle (22).

6. A reverse power protection mechanical actuator according to claim 3, characterized in that, The mounting box (15) has multiple wire holes (29) on its top and bottom.

7. A reverse power protection mechanical actuator according to claim 1, characterized in that, The rear surface of the mounting base (11) is fixedly connected to a shock-absorbing and anti-slip pad (30).

8. A reverse power protection mechanical actuator according to claim 7, characterized in that, Mounting holes (31) are provided at the four corners of the upper surface of the mounting base (11) and the shock-absorbing and anti-slip pad (30).

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