Photovoltaic energy storage inverter arc fault detection device

Abstract

The invention belongs to the technical field of arc fault detection, and relates to a photovoltaic energy storage inverter arc fault detection device which comprises a detection box, two protection grooves are symmetrically formed in the side face of the detection box, and a cover plate is rotationally arranged at the position, located at the end of each protection groove, of one side of the detection box. Piston plates are horizontally and slidably connected into the two protection grooves in a sealed mode, probes are fixedly installed in the middles of the sides, close to the cover plates, of the piston plates, a connecting piece is arranged between each piston plate and the corresponding cover plate, and an air inlet is formed in the top face of the end, away from the corresponding cover plate, of each protection groove; each piston plate is provided with a plurality of inclined air blowing ports, and the end of each air blowing port faces the probe. The device has the advantages that when the electric push rod is used for pushing the probe to move towards the outside of the protection groove, the connecting rod can push the cover plate to rotate upwards, so that the probe is moved out from the lower part of the cover plate, the cover plate is automatically opened when the probe is moved, separate driving is not needed, and the device is more convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of arc fault detection technology and relates to an arc fault detection device for photovoltaic energy storage inverters. Background Technology

[0002] As the core equipment of a photovoltaic power generation system, the photovoltaic energy storage inverter undertakes the critical task of converting direct current (DC) to alternating current (AC), and its operational stability directly affects the system's efficiency and safety. When connecting cables to the terminals of the photovoltaic energy storage inverter, arcing faults can easily occur due to issues such as aging wiring and poor contact. Failure to detect these faults in a timely manner may lead to safety accidents such as fires and equipment damage. Therefore, arcing fault detection devices are a crucial component for ensuring system safety.

[0003] A photovoltaic inverter arc fault detection device disclosed in Chinese patent CN202323214169.0 includes a housing component comprising two housing cavities opened inside a housing box, each housing cavity having a limiting block, and two probes located inside the two limiting blocks respectively. Two limiting strips are provided on one side of the housing box, and two servo motors are provided inside the housing box. Each of the two servo motors has a baffle connected to one side of its rotating shaft. An electric push rod is provided inside the housing box. One end of the electric push rod is fixedly connected to the limiting block, and a rubber ring is provided on the side of the limiting block facing the baffle.

[0004] Before the fault detection device can perform a test, the baffle needs to be rotated away from the storage cavity by a servo motor, and then the probe needs to be moved out by an electric push rod. This increases the number of steps for the operator and makes it less convenient to use.

[0005] To address the aforementioned problems, this invention proposes an arc fault detection device for photovoltaic energy storage inverters. Summary of the Invention

[0006] To address the problems existing in the background technology, this invention proposes an arc fault detection device for photovoltaic energy storage inverters.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: it includes a testing box, on which two protective grooves are symmetrically opened on the side, and a cover plate is rotatably provided at the end of each protective groove on one side of the testing box.

[0008] Both of the protective grooves are horizontally sealed and slidably connected with piston plates. A probe is fixedly installed in the middle of the piston plate near the cover plate. A connector is provided between each piston plate and the corresponding cover plate.

[0009] Each of the protective grooves has an air inlet on the top surface away from the cover plate, and each piston plate has several inclined air inlets, with the end of each air inlet facing the probe.

[0010] Furthermore, each protective groove in the testing box is provided with an installation groove at its end. An electric push rod is fixedly installed inside each installation groove. The telescopic end of the electric push rod slides horizontally through the end face of the installation groove and extends into the corresponding protective groove. The piston plate is fixedly connected to the end of the telescopic end of the electric push rod.

[0011] Furthermore, several of the air inlets are arranged in a circumferential array about the probe, and each air inlet is gradually inclined toward the outer surface of the piston plate from one end near the probe to the other end. A one-way valve is provided on the air inlet and each air inlet.

[0012] Furthermore, each piston plate is fixedly connected to two limiting rods on the side near the probe. The limiting rods are arranged horizontally, and the two limiting rods are distributed in a circular array about the corresponding probe.

[0013] Furthermore, a connecting block is fixedly connected to the top of each protective groove on the side of the detection box, and a connecting shaft is rotatably inserted through each connecting block, with the connecting shaft arranged horizontally.

[0014] Two connecting plates are fixedly connected at intervals on the outer surface of the top of each cover plate. The two connecting plates are respectively fixedly sleeved on the two ends of a corresponding connecting shaft, and the connecting plates are slidably engaged with the connecting blocks.

[0015] Furthermore, the connector includes a locking block and two L-shaped connecting rods, with a locking plate fixedly connected to the middle of one side of the locking block, and the locking plate fixedly connected to one side of the top of the cover plate;

[0016] The two connecting rods are fixedly connected to one side of the top of the piston plate at intervals. The clamping plate is slidably disposed between the two connecting rods. The connecting rods are composed of a horizontal section and a vertical section from one end connected to the piston plate to the other end. The vertical section of the connecting rod is movably abutted against one side of the clamping block.

[0017] Furthermore, a connecting block is fixedly connected to the bottom of each protective groove on the side of the detection box, and a connecting shaft is rotatably inserted through each connecting block, with the connecting shaft arranged horizontally.

[0018] Two connecting plates are fixedly connected at intervals on the outer surface of the bottom of each cover plate. The two connecting plates are respectively fixedly sleeved on the two ends of a corresponding connecting shaft, and the connecting plates are slidably engaged with the connecting blocks.

[0019] Each of the connecting shafts is fitted with a torsion spring at both ends. One end of the torsion spring is fixedly connected to the connecting block, and the other end of the torsion spring is fixedly connected to the connecting plate.

[0020] Furthermore, the connector includes a pull rope, one end of which is fixedly connected to one side of the bottom of the piston plate, and the other end of which is fixedly connected to one side of the bottom of the cover plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The photovoltaic energy storage inverter arc fault detection device is equipped with a connecting rod. When the probe is pushed outward by the electric push rod, the piston plate simultaneously drives the connecting rod to move outward of the detection box. The vertical section of the connecting rod will first push the cover plate to rotate upward. Then the cover plate is located at the top of the connecting rod, so that the two connecting rods pass through the two sides of the clamping plate respectively. After that, the probe moves out from under the cover plate, so that the cover plate is automatically opened when the probe is moved, without the need for separate driving, making it more convenient to use.

[0023] 2. The photovoltaic energy storage inverter arc fault detection device is equipped with a pull rope. When the electric push rod pushes the probe to move out of the protective groove, the piston plate drives one end of the pull rope to move. Under the action of the torsion spring on the connecting shaft, the cover plate will be driven to rotate downward. Then, with the weight of the cover plate, the cover plate will rotate away from the end of the protective groove, so that the probe can be moved out from the top of the cover plate. This makes the cover plate open automatically when the probe is moved, without the need for separate driving, making it more convenient to use.

[0024] 3. The photovoltaic energy storage inverter arc fault detection device is equipped with a connecting rod. When the piston plate drives the probe and connecting rod to move into the protective groove, the cover plate will automatically rotate downward under its own weight until the vertical section of the connecting rod abuts against one side of the locking block, fixing the cover plate to one side of the detection box and sealing the protective groove. The device has a high degree of automation.

[0025] 4. The photovoltaic energy storage inverter arc fault detection device is equipped with a pull rope. When the piston plate drives the probe to move into the protective groove, the piston plate will pull one end of the pull rope, and the other end of the pull rope will drive the cover plate to rotate upward until the cover plate is fixed on one side of the detection box to seal the protective groove. The device has a high degree of automation.

[0026] 5. The photovoltaic energy storage inverter arc fault detection device is equipped with an air blowing port, the end of which faces the probe. When the piston plate moves to the outside of the detection box, external gas will enter the cavity located on the side of the piston plate away from the probe from the air inlet. When the piston plate moves into the protective groove, the piston plate will squeeze the gas and blow the gas from the air blowing port to the probe to clean the probe. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure inside the protective groove in Embodiment 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure in Embodiment 1 of the present invention with the cover plate not opened;

[0030] Figure 4 This is a schematic diagram of the structure of the cover plate opening in Embodiment 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure inside the protective groove in Embodiment 2 of the present invention.

[0032] In the diagram: 1. Detection box; 2. Air inlet; 3. Cover plate; 4. Electric push rod; 5. Protective groove; 6. Piston plate; 7. Probe; 8. Air outlet; 9. Connecting rod; 10. Locking block; 11. Pull rope; 12. Connecting block; 13. Limiting rod; 14. Connecting plate; 15. Connecting shaft; 16. Mounting groove; 17. Locking plate. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1: As Figures 1-4 As shown, the technical solution adopted by the present invention is as follows: a photovoltaic energy storage inverter arc fault detection device, including a detection box 1, and two protective grooves 5 are symmetrically opened on the side of the detection box 1.

[0035] Both protective grooves 5 have piston plates 6 that are horizontally sealed and slidably connected inside.

[0036] Each protective groove 5 in the testing box 1 has a mounting groove 16 at its end, and an electric push rod 4 is fixedly installed inside each mounting groove 16. The telescopic end of the electric push rod 4 slides horizontally through the end face of the mounting groove 16 and extends into the corresponding protective groove 5. A piston plate 6 is fixedly connected to the end of the telescopic end of the electric push rod 4. The piston plate 6 is driven by the electric push rod 4 to slide horizontally inside the protective groove 5.

[0037] A probe 7 is fixedly mounted on the center of the piston plate 6 near the cover plate 3. The probe 7 is a test probe, a key component in the field of electronic testing used to detect the connection performance of printed circuit board assemblies, and is an existing product.

[0038] Specifically, during testing, probe 7 also needs to be electrically connected to a current sensor or voltage sensor and a microcontroller. For example, one end of the current sensor or voltage sensor is electrically connected to the signal output terminal of probe 7, and the other end of the current sensor is electrically connected to the microcontroller. When probe 7 contacts the wiring port of the photovoltaic energy storage inverter, it will acquire the current or voltage signal at the port (arc faults will cause abnormal characteristics such as high-frequency fluctuations and spike pulses in the current or voltage). The current sensor or voltage sensor converts the signal into a standard electrical signal and transmits it to the microcontroller. The microcontroller analyzes the signal using a built-in algorithm to determine whether an arc fault exists. Moreover, the technology used by probe 7 for testing is also applied in patent CN202323214169.0 mentioned in the background technology. Its usage method is a disclosed technology and will not be elaborated further here.

[0039] Each piston plate 6 has two limiting rods 13 fixedly connected to the side near the probe 7. The limiting rods 13 are arranged horizontally. The two limiting rods 13 are arranged in a circular array with respect to the corresponding probe 7, so that when the wiring port of the photovoltaic energy storage inverter is moved to the probe 7, the limiting rods 13 can be inserted into the wiring port of the photovoltaic energy storage inverter together for positioning.

[0040] A cover plate 3 is rotatably installed on one side of the test box 1 at the end of each protective groove 5.

[0041] On the side of the test box 1, at the top of each protective groove 5, a connecting block 12 is fixedly connected, and a connecting shaft 15 is rotatably passed through each connecting block 12. The connecting shaft 15 is arranged horizontally.

[0042] Two connecting plates 14 are fixedly connected at intervals to the outer surface of the top of each cover plate 3. The two connecting plates 14 are respectively fixedly sleeved on the two ends of a corresponding connecting shaft 15. The connecting plates 14 are slidably engaged with the connecting blocks 12. The cover plates 3 are connected to the connecting shafts 15, allowing the cover plates 3 to rotate up and down on one side of the detection box 1. When the cover plate 3 is in a vertical position, the side of the cover plate 3 is in contact with the side of the detection box 1, thereby sealing the end of the protective groove 5.

[0043] Each piston plate 6 is connected to its corresponding cover plate 3 by a connector.

[0044] The connector includes a locking block 10 and two L-shaped connecting rods 9. A locking plate 17 is fixedly connected to the middle of one side of the locking block 10. The locking plate 17 is fixedly connected to one side of the top of the cover plate 3, so that the locking block 10 and the locking plate 17 rotate together with the cover plate 3.

[0045] Two connecting rods 9 are fixedly connected to one side of the top of the piston plate 6 at intervals, and a retaining plate 17 is slidably disposed between the two connecting rods 9 so that the retaining plate 17 will not affect the horizontal movement of the connecting rods 9.

[0046] The connecting rod 9 consists of a horizontal section and a vertical section from the end connected to the piston plate 6 to the other end, with the vertical section fixedly connected to the bottom of the horizontal section. The vertical section of the connecting rod 9 movably abuts against one side of the locking block 10. The connecting rod 9 is limited by the cooperation between the connecting rod 9 and the locking block 10, thereby fixing the cover plate 3.

[0047] Each protective groove 5 has an air inlet 2 on its top surface at the end away from the cover plate 3. The piston plate 6 divides the interior of the protective groove 5 into two cavities, and the air inlet 2 is connected to one of the cavities on the side of the piston plate 6 away from the probe 7.

[0048] To prevent impurities from entering the air inlet 2, a filter screen can be installed at the top of the air inlet 2.

[0049] Each piston plate 6 has several inclined air inlets 8, with the end of each air inlet 8 facing the probe 7.

[0050] Several air inlets 8 are arranged in a circular array about the probe 7, and each air inlet 8 gradually slopes towards the outer surface of the piston plate 6 from one end near the probe 7 to the other end. This ensures that all air inlets 8 can blow gas toward the probe 7.

[0051] One-way valves are provided on both the air inlet 2 and each air outlet 8. The one-way valve at the air inlet 2 allows external gas to enter the protective groove 5 through the air inlet 2; the one-way valve on the air outlet 8 only allows gas to flow from the cavity of the piston plate 6 in the protective groove 5 away from the probe 7 towards the probe 7, preventing reverse flow of gas.

[0052] Working principle:

[0053] In use, the electric push rod 4 is activated, which pushes the piston plate 6 to move closer to the cover plate 3 within the protective groove 5. The piston plate 6 then moves the probe 7 and the connecting rod 9.

[0054] The end of the vertical section of the connecting rod 9 first pushes the cover plate 3, causing the cover plate 3 to rotate upward. This causes the connecting shaft 15 to rotate within the connecting block 12, and the cover plate 3 simultaneously drives the probe 7 and the locking block 10 to rotate.

[0055] As the cover plate 3 rotates upward, the connecting rod 9 moves at the bottom of the cover plate 3, causing the two connecting rods 9 to slide on both sides of the locking plate 17, while the locking block 10 is located at the bottom of the connecting rod 9. The connecting rod 9 then continues to move at the bottom of the cover plate 3, positioning the cover plate 3.

[0056] When the piston plate 6 moves, the cavity between the piston plate 6 and the end face of the protective groove 5 increases, allowing external gas to enter the protective groove 5 from the air inlet 2.

[0057] Move probe 7 until it is outside the protective tank 5. Move the photovoltaic energy storage inverter to one side of the test box 1 so that the wiring port of the photovoltaic energy storage inverter is moved onto probe 7 for arc fault detection.

[0058] After the test is completed, the wiring port of the photovoltaic energy storage inverter is removed from probe 7. The electric push rod 4 drives the piston plate 6 to slide within the protective groove 5, causing probe 7 to move into the protective groove 5.

[0059] When the piston plate 6 drives the connecting rod 9 to move, the cover plate 3 is in a horizontal state and will rotate downward under the action of gravity, so that the cover plate 3 presses on the top of the connecting rod 9.

[0060] As the piston plate 6 moves, it compresses the gas at the air inlet 2, causing the gas to enter several air outlets 8 and then spray it onto the probe 7. This blows away the dust on the probe 7 and cools it down. Since the cover plate 3 does not block the protective groove 5 at this time, the dust can be discharged from the end of the protective groove 5 along with the airflow.

[0061] When the vertical section of the connecting rod 9 moves into the protective groove 5, the cover plate 3 rotates to a vertical position and is located at the end of the protective groove 5. As the connecting rod 9 continues to move, the end of the vertical section of the connecting rod 9 abuts against one side of the locking block 10, thereby fixing the cover plate 3 to the end of the protective groove 5, sealing the protective groove 5, and protecting the probe 7.

[0062] Example 2: As Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that:

[0063] A cover plate 3 is rotatably installed on one side of the test box 1 at the end of each protective groove 5.

[0064] On the side of the test box 1, at the bottom of each protective groove 5, there is a connecting block 12 fixedly connected, and a connecting shaft 15 is rotatably passed through each connecting block 12. The connecting shaft 15 is arranged horizontally.

[0065] Two connecting plates 14 are fixedly connected at intervals to the outer surface of the bottom of each cover plate 3. The two connecting plates 14 are respectively fixedly sleeved on the two ends of a corresponding connecting shaft 15. The connecting plates 14 are slidably engaged with the connecting blocks 12. The cover plates 3 are connected to the connecting shafts 15, allowing the cover plates 3 to rotate up and down on one side of the detection box 1. When the cover plate 3 is in a vertical position, the side of the cover plate 3 is in contact with the side of the detection box 1, thereby sealing the end of the protective groove 5.

[0066] Each connecting shaft 15 has a torsion spring fitted at both ends. One end of the torsion spring is fixedly connected to the connecting block 12, and the other end is fixedly connected to the connecting plate 14. When the torsion spring is in its initial state, it drives the cover plate 3 to rotate to a horizontal state, making the end of the protective groove 5 open.

[0067] Each piston plate 6 is connected to its corresponding cover plate 3 by a connector.

[0068] The connector includes a pull cord 11. One end of the pull cord 11 is fixedly connected to one side of the bottom of the piston plate 6, and the other end of the pull cord 11 is fixedly connected to one side of the bottom of the cover plate 3.

[0069] Working principle:

[0070] When the electric push rod 4 drives the probe 7 to move outward of the protective groove 5, the piston plate 6 will drive one end of the pull rope 11 to move. Under the action of the torsion spring on the connecting shaft 15, the cover plate 3 will be driven to rotate downward, so that the cover plate 3 continues to tighten the pull rope 11.

[0071] When the cover plate 3 rotates downwards to a horizontal position and stops rotating, the pull rope 11 will accumulate inside the protective groove 5. Then, the probe 7 can be moved outside the protective groove 5 to detect arc faults in the photovoltaic energy storage inverter.

[0072] After the test is completed, the electric push rod 4 drives the probe 7 to move into the protective groove 5, and the piston plate 6 moves to gradually lengthen the pull rope 11.

[0073] After the piston plate 6 tightens the pull rope 11, the piston plate 6 continues to move and pulls the cover plate 3 upward through the pull rope 11 until the cover plate 3 abuts against the end of the protective groove 5, thereby sealing the protective groove 5.

[0074] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A photovoltaic energy storage inverter arc fault detection device, characterized in that, The test box (1) includes two protective grooves (5) symmetrically opened on the side of the test box (1), and a cover plate (3) is rotatably installed at the end of each protective groove (5) on one side of the test box (1). Both of the protective grooves (5) are horizontally sealed and slidably connected with piston plates (6). A probe (7) is fixedly installed in the middle of the piston plate (6) near the cover plate (3). A connecting piece is provided between each piston plate (6) and the corresponding cover plate (3). Each of the protective grooves (5) has an air inlet (2) on the top surface away from the cover plate (3), and each piston plate (6) has several inclined air inlets (8), with the end of each air inlet (8) facing the probe (7).

2. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: The detection box (1) has an installation slot (16) at the end of each protective slot (5). An electric push rod (4) is fixedly installed inside each installation slot (16). The telescopic end of the electric push rod (4) slides horizontally through the end face of the installation slot (16) and extends into the corresponding protective slot (5). The piston plate (6) is fixedly connected to the end of the telescopic end of the electric push rod (4).

3. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: Several air inlets (8) are arranged in a circular array about the probe (7). Each air inlet (8) is gradually inclined towards the outer surface of the piston plate (6) from one end close to the probe (7) to the other end. A one-way valve is provided on the air inlet (2) and each air inlet (8).

4. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: Each piston plate (6) is fixedly connected to two limiting rods (13) on the side near the probe (7). The limiting rods (13) are arranged horizontally, and the two limiting rods (13) are arranged in a circular array about the corresponding probe (7).

5. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: On the side of the detection box (1), a connecting block (12) is fixedly connected to the top of each protective groove (5). A connecting shaft (15) is rotatably passed through each connecting block (12), and the connecting shaft (15) is arranged horizontally. Two connecting plates (14) are fixedly connected at intervals on the outer surface of the top of each cover plate (3). The two connecting plates (14) are respectively fixedly sleeved on the two ends of a corresponding connecting shaft (15), and the connecting plates (14) slide with the connecting block (12).

6. The photovoltaic energy storage inverter arc fault detection device according to claim 5, characterized in that: The connector includes a locking block (10) and two L-shaped connecting rods (9). A locking plate (17) is fixedly connected to the middle of one side of the locking block (10), and the locking plate (17) is fixedly connected to one side of the top of the cover plate (3). Two connecting rods (9) are fixedly connected to one side of the top of the piston plate (6) at intervals. The clamping plate (17) is slidably disposed between the two connecting rods (9). The connecting rod (9) consists of a horizontal section and a vertical section from one end connected to the piston plate (6) to the other end. The vertical section of the connecting rod (9) is movably abutted against one side of the clamping block (10).

7. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: On the side of the test box (1), at the bottom of each protective groove (5), there is a connecting block (12) fixedly connected, and a connecting shaft (15) is rotatably passed through each connecting block (12). The connecting shaft (15) is arranged horizontally. Two connecting plates (14) are fixedly connected at intervals on the outer surface of the bottom of each cover plate (3). The two connecting plates (14) are respectively fixedly sleeved on the two ends of a corresponding connecting shaft (15). The connecting plates (14) and the connecting blocks (12) are in sliding fit. Each of the connecting shafts (15) is fitted with a torsion spring at both ends, one end of which is fixedly connected to the connecting block (12), and the other end of which is fixedly connected to the connecting plate (14).

8. The photovoltaic energy storage inverter arc fault detection device according to claim 7, characterized in that: The connector includes a pull rope (11), one end of which is fixedly connected to one side of the bottom of the piston plate (6), and the other end of which is fixedly connected to one side of the bottom of the cover plate (3).

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