Photovoltaic energy storage inverter arc fault detection device

Abstract

The present invention relates to the field of inverter fault detection, and specifically relates to an arc fault detection device for a photovoltaic energy storage inverter. It includes an inverter body and a housing sleeved outside it. A power switch is provided at the lower end of the inverter body, a transformer fixedly connected to the housing is beside it, and a detection device electrically connected to the power switch is also provided. An electromagnetic drive type circuit breaker mechanism is provided beside the detection device, which includes an electromagnetic coil, an iron core, a moving contact and a static contact. When the detection device detects an arc fault signal of the power switch, it sends a current pulse to the electromagnetic coil to make it energized to generate a magnetic field, and the iron core drives the moving contact away from the static contact. A fan for cooling is provided beside the power switch. A protection mechanism is provided beside the transformer, which is composed of an insulating cover and an insulating baffle. When the moving contact is separated from the static contact, the insulating cover moves towards the transformer and sleeves the transformer, and then the insulating baffle abuts against the insulating cover to play a protective role. This device can detect faults in the inverter and cool down and insulate the fault area.

Description

Technical Field

[0001] The present invention relates to the field of inverter fault detection, and more particularly to an arc fault detection device for a photovoltaic energy storage inverter. Background Art

[0002] A photovoltaic inverter can convert the variable DC voltage generated by a photovoltaic solar panel into AC power with the frequency of the commercial power grid, which can be fed back into the commercial power transmission system or used for an off-grid power grid. However, in the prior art, the weak signals in the initial stage of an arc fault are difficult to be captured in time, resulting in the failure not being detected and processed in the early stage, and thus more serious accidents may be triggered. When an arc fault occurs, since it cannot be detected in time, the fault will continue to develop, causing irreversible damage to the components of the inverter.

[0003] Secondly, after an arc fault occurs, the open-circuit protection measures are not fast and reliable enough. The existing open-circuit mechanism has a long response time and cannot cut off the fault current in a short time, which will lead to the expansion of the fault range, affect the normal operation of the inverter, and even may damage the entire photovoltaic energy storage system. Moreover, some open-circuit mechanisms are prone to failure after multiple uses and have poor reliability.

[0004] Furthermore, the heat dissipation problem is also a major pain point of the existing devices. An arc fault is often accompanied by the generation of a large amount of heat, while the existing devices lack an effective heat dissipation mechanism. The heat accumulates in the fault area, which will cause secondary damage to the surrounding components, reduce the service life of the inverter, and increase the difficulty and cost of maintenance.

[0005] Finally, in the prior art, the protection of key components such as transformers is insufficient. When an arc fault occurs, the transformer is easily affected by the arc and current, and the existing protection devices cannot isolate the transformer from the fault area well, resulting in an increased risk of transformer damage and affecting the stability of the entire system. Summary of the Invention

[0006] Based on this, it is necessary to provide an arc fault detection device for a photovoltaic energy storage inverter in view of the problems in the prior art.

[0007] To solve the problems in the prior art, the technical solution adopted by the present invention is as follows:

[0008] An arc fault detection device for a photovoltaic energy storage inverter, comprising an inverter body, an outer shell is sleeved outside the inverter body, a power switch is arranged at the lower end of the inverter body, a transformer fixedly connected to the outer shell is arranged beside the power switch, a detection device electrically connected to the power switch is arranged beside the power switch, and further comprising:

[0009] There is an electromagnetic drive type circuit breaker mechanism arranged beside the detection device. The electromagnetic drive type circuit breaker mechanism includes an electromagnetic coil, an iron core, a moving contact and a static contact. The electromagnetic coil is arranged beside the detection device and is electrically connected to the detection device. After the detection device detects an arc fault signal in the power switch, it immediately sends a current pulse to the electromagnetic coil. The electromagnetic coil is energized to generate a magnetic field. The iron core is connected to the output end of the electromagnetic coil. The moving contact is movably arranged beside the iron core. The static contact is arranged on the side of the moving contact away from the iron core. The moving contact and the static contact are connected when the power switch is faulty. After the electromagnetic coil is energized, the iron core drives the moving contact to move away from the static contact. There is a fan arranged beside the power switch. After the fan starts, it cools the power switch. There is a protection mechanism arranged beside the transformer. The protection mechanism includes an insulating cover and an insulating baffle. The insulating cover is slidably arranged beside the transformer. When the moving contact and the static contact are separated, the insulating cover moves towards the transformer and sleeves outside the transformer. The insulating baffle is slidably arranged on the side of the transformer away from the insulating cover. When the insulating cover sleeves outside the transformer, the insulating baffle abuts against the insulating cover.

[0010] Further, the electromagnetic drive type circuit breaker mechanism further includes a positioning seat, a reset tension spring and a circular iron sheet. The positioning seat is arranged beside the iron core and is fixedly connected to the housing. The moving contact is slidably connected to the positioning seat. The circular iron sheet is fixedly connected to the end of the moving contact away from the static contact. The reset tension spring is sleeved outside the moving contact. One end of the reset tension spring is fixedly connected to the circular iron sheet, and the other end is fixedly connected to the positioning seat.

[0011] Further, an engagement clamping plate is sleeved outside the moving contact. A micro switch is arranged beside the moving contact. The micro switch is electrically connected to the fan. When the moving contact moves, it drives the engagement clamping plate to trigger the micro switch.

[0012] Further, the protection mechanism further includes a main electric push rod, a sub-electric push rod, a connecting support rod, a connecting rack and a power gear. The main electric push rod is arranged beside the transformer and its fixed end is fixedly connected to the housing. The connecting support rod is fixedly connected to the movable end of the main electric push rod. The connecting rack is fixedly connected to the connecting support rod. The power gear is arranged beside the transformer and is rotatably connected to the housing through a tooth seat. The power gear meshes with the connecting rack. The power gear is the movable end of the protection mechanism. The sub-electric push rod is arranged above the transformer and its fixed end is fixedly connected to the housing. The movable end of the sub-electric push rod is fixedly connected to the insulating cover.

[0013] Furthermore, the protection mechanism also includes two transfer pulleys, two power pulleys, two transfer gears and two transfer racks. The two transfer pulleys are rotatably arranged on both sides of the transformer, the two transfer pulleys are coaxially arranged and fixedly connected to the movable end of the protection mechanism, the two power pulleys are respectively arranged below the two transfer pulleys, the two power pulleys are respectively connected to the two transfer pulleys through belts, the two transfer gears are respectively coaxially fixedly connected to the two power pulleys, the two transfer racks are respectively arranged on both sides of the transformer, the two transfer racks are respectively meshed with the two transfer gears, the two transfer racks are respectively two output ends of the protection mechanism, and the transfer rack close to the outer casing is fixedly connected to the insulating baffle.

[0014] Furthermore, the protection mechanism also includes two limit slide rails, which are respectively arranged on both sides of the transformer, and the two transfer racks are respectively slidably connected to the two limit slide rails.

[0015] Furthermore, the protection mechanism also includes a driven gear, a driving pulley, a driven pulley, a bevel gear rack, a driving bevel gear, a driven bevel gear and a cam. The driven gear is rotatably connected to the insulating cover, the driving pulley is coaxially fixedly connected to the driven gear, the bevel gear rack is arranged on the side of the driving pulley, the driven pulley is rotatably connected to the bevel gear rack and is connected to the driving pulley through a belt drive, the driving bevel gear is rotatably connected to the bevel gear rack and coaxially fixedly connected to the driven pulley, the driven bevel gear is rotatably connected to the bevel gear rack and meshes with the driving bevel gear, the cam is coaxially fixedly connected to the driven bevel gear, and the output end of the protection mechanism away from the housing meshes with the driven gear when moving, and the cam is the free end of the protection mechanism.

[0016] Furthermore, the protection mechanism also includes an insulating pressure plate, a connecting support plate, two tension springs and two limit slides. A limit ring groove is formed on the side of the insulating cover close to the outer shell. The insulating pressure plate is slidably connected to the limit ring groove. The two limit slides are respectively slidably connected to the insulating cover. The limit slide is fixedly connected to the insulating pressure plate. The two ends of the connecting support plate are respectively fixedly connected to the two limit slides. The two tension springs are respectively arranged on the side close to the two limit slides. One end of the tension spring is fixedly connected to the connecting support plate, and the other end is fixedly connected to the insulating cover. The free end of the protection mechanism is against the connecting support plate.

[0017] Furthermore, the protection mechanism also includes a warning light, which is arranged at one end of the shell close to the transformer, and the warning light is electrically connected to the auxiliary electric push rod.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] First: The arc fault detection device of the photovoltaic energy storage inverter of the present invention has a highly sensitive arc fault detection function. The detection device is closely connected to the power switch and can collect parameters such as current and voltage of the power switch in real time and accurately. Through advanced algorithms and sensor technologies, even weak signals in the initial stage of arc faults can be quickly captured. Compared with existing devices, the timeliness and accuracy of fault detection are greatly improved. This enables operators to know the situation immediately when a fault occurs, take timely measures to avoid further deterioration of the fault, ensure the stable operation of the photovoltaic energy storage inverter, and reduce losses caused by faults;

[0020] Second: The electromagnetic drive type circuit breaker mechanism of this device has an extremely fast response speed. When the detection device detects an arc fault signal, it can immediately send a current pulse to the electromagnetic coil. The electromagnetic coil is quickly energized to generate a magnetic field, driving the iron core and the moving contact to move quickly, realizing the rapid opening of the power switch. Compared with existing devices, the opening time is greatly shortened, and the fault current can be cut off in a short time, effectively preventing the expansion of the fault range. At the same time, the setting of the positioning seat, the reset tension spring and the circular iron sheet ensures the stability and accuracy of the movement of the moving contact, and can automatically return to the initial position after the fault is eliminated, improving the reliability and repeatable use of the device;

[0021] Third: The heat dissipation function of this device is significantly improved. When the moving contact moves, it triggers the micro switch through the connecting clamping plate, causing the fan to start immediately to forcibly dissipate heat from the power switch. In the case of a large amount of heat generated by arc faults, the heat can be dissipated in time to prevent heat accumulation from causing secondary damage to surrounding components. Compared with existing devices, it effectively protects the components of the inverter and extends its service life. Moreover, the forced heat dissipation method ensures the subsequent maintenance feasibility of the inverter, reduces the maintenance cost and difficulty, and improves the reliability and stability of the entire photovoltaic energy storage system;

[0022] Fourth: The protection of the transformer by this device is very perfect. Through the coordinated work of a series of components such as the main electric push rod, the secondary electric push rod, the transfer belt pulley, the power belt pulley, the transfer gear and the transfer rack, the insulating cover and the insulating baffle can be quickly moved into place when an arc fault occurs, forming a full-wrap design for the transformer, completely isolating the transformer from other normally operating areas, blocking the possible spreading arc and current, and preventing the transformer from being affected by the fault. Compared with existing devices, the risk of transformer damage is greatly reduced, the safety of the core components of the entire photovoltaic energy storage system is ensured, and the stability and reliability of the system are improved. Brief Description of the Drawings

[0023] Figure 1 is a three-dimensional structural schematic diagram of the embodiment;

[0024] Figure 2Schematic diagram of the three-dimensional structure of the embodiment;

[0025] Figure 3 Schematic diagram of the three-dimensional structure of the electromagnetic drive type circuit breaker mechanism in the embodiment;

[0026] Figure 4 Is Figure 3 Enlarged view of the structure at position A in;

[0027] Figure 5 Schematic diagram of the three-dimensional structure of the electromagnetic drive type circuit breaker mechanism and the protection mechanism in the embodiment;

[0028] Figure 6 Front view of the electromagnetic drive type circuit breaker mechanism in the embodiment;

[0029] Figure 7 Schematic diagram of the three-dimensional structure of the protection mechanism in the embodiment;

[0030] Figure 8 Schematic diagram of the three-dimensional structure of the protection mechanism from another angle in the embodiment;

[0031] Figure 9 Is Figure 8 Enlarged view of the structure at position B in.

[0032] The reference numerals in the figure are:

[0033] 1. Inverter body; 2. Housing; 3. Power switch; 4. Transformer; 5. Detection device; 6. Electromagnetic drive type circuit breaker mechanism; 7. Electromagnetic coil; 8. Iron core; 9. Moving contact; 10. Microswitch; 11. Positioning seat; 12. Connecting clamping plate; 13. Return spring; 14. Circular iron sheet; 15. Static contact; 16. Fan; 17. Protection mechanism; 18. Warning light; 19. Main electric push rod; 20. Connecting support rod; 21. Connecting rack; 22. Power gear; 23. Transfer belt pulley; 24. Power belt pulley; 25. Transfer gear; 26. Transfer rack; 27. Insulating baffle; 28. Auxiliary electric push rod; 29. Insulating cover; 30. Limit ring groove; 31. Insulating pressing plate; 32. Limit sliding plate; 33. Connecting support plate; 34. Tightening spring; 35. Cam; 36. Driven bevel gear; 37. Driving bevel gear; 38. Bevel gear rack; 39. Driven belt pulley; 40. Driving belt pulley; 41. Driven gear; 42. Limit slide rail. Detailed implementation manners

[0034] In order to further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0035] Refer to Figures 1 to 9, a photovoltaic energy storage inverter arc fault detection device, including an inverter body 1, an outer shell 2 is sleeved outside the inverter body 1, a power switch 3 is arranged at the lower end of the inverter body 1, a transformer 4 fixedly connected to the outer shell 2 is arranged beside the power switch 3, a detection device 5 electrically connected to the power switch 3 is arranged beside the power switch 3, and further includes:

[0036] An electromagnetic drive type circuit breaker mechanism 6 is arranged beside the detection device 5. The electromagnetic drive type circuit breaker mechanism 6 includes an electromagnetic coil 7, an iron core 8, a moving contact 9 and a static contact 15. The electromagnetic coil 7 is arranged beside the detection device 5 and electrically connected to the detection device 5. After the detection device 5 detects an arc fault signal in the power switch 3, it immediately sends a current pulse to the electromagnetic coil 7. The electromagnetic coil 7 is energized to generate a magnetic field. The iron core 8 is connected to the output end of the electromagnetic coil 7. The moving contact 9 is movably arranged beside the iron core 8. The static contact 15 is arranged on the side of the moving contact 9 away from the iron core 8 (as Figure 6 shown). The moving contact 9 and the static contact 15 are in contact when the power switch 3 is working normally. After the electromagnetic coil 7 is energized, the iron core 8 drives the moving contact 9 to move away from the static contact 15. A fan 16 is arranged beside the power switch 3. After the fan 16 starts, it cools the power switch 3. A protection mechanism 17 is arranged beside the transformer 4. The protection mechanism 17 includes an insulating cover 29 and an insulating baffle 27. The insulating cover 29 is slidably arranged beside the transformer 4. When the moving contact 9 and the static contact 15 are separated, the insulating cover 29 moves towards the transformer 4 and sleeves outside the transformer 4. The insulating baffle 27 is slidably arranged on the side of the transformer 4 away from the insulating cover 29. When the insulating cover 29 sleeves outside the transformer 4, the insulating baffle 27 abuts against the insulating cover 29.

[0037] When the device is running, when the detection device 5 detects an arc fault signal, it immediately sends a current pulse to the electromagnetic coil 7. The electromagnetic coil 7 is energized to generate a magnetic field, attracting the iron core 8 to drive the moving contact 9 to quickly separate from the static contact 15, realizing the quick breaking of the power switch 3. At the same time, the fan 16 performs forced heat dissipation on the fault area. Because arc faults often generate a large amount of heat, quick heat dissipation can prevent heat accumulation from causing secondary damage to surrounding components and ensure the subsequent maintainability of the inverter.

[0038] At the same time, the insulating cover 29 moves and cooperates with the insulating baffle 27 to quickly isolate the transformer 4 from other normal operating areas, blocking the possible spreading arc and current and preventing the fault from expanding.

[0039] In order to limit the movement of the moving contact 9, the following features are specifically set:

[0040] The electromagnetic drive type open circuit mechanism 6 further includes a positioning seat 11, a reset tension spring 13 and a circular iron sheet 14. The positioning seat 11 is arranged beside the iron core 8 and fixedly connected to the outer shell 2. The moving contact 9 is slidably connected to the positioning seat 11. The circular iron sheet 14 is fixedly connected to one end of the moving contact 9 away from the static contact 15. The reset tension spring 13 is sleeved outside the moving contact 9. One end of the reset tension spring 13 is fixedly connected to the circular iron sheet 14, and the other end is fixedly connected to the positioning seat 11. After the electromagnetic coil 7 is energized and drives the moving contact 9 to move through the iron core 8, the reset tension spring 13 is stretched. When the electromagnetic coil 7 is powered off after the fault is eliminated, the pulling force of the reset tension spring 13 will make the moving contact 9 return to the initial position. The positioning seat 11 provides a stable track for the movement of the moving contact 9, ensuring the accuracy of the movement of the moving contact 9.

[0041] In order to trigger the fan 16 to forcibly dissipate heat from the faulty power switch 3, prevent heat accumulation from damaging surrounding components, and ensure the feasibility of subsequent maintenance, the following features are specifically set:

[0042] An engagement clamping plate 12 is sleeved outside the moving contact 9. A microswitch 10 is arranged beside the moving contact 9. The microswitch 10 is electrically connected to the fan 16. When the moving contact 9 moves, it drives the engagement clamping plate 12 to trigger the microswitch 10. When the moving contact 9 moves due to the arc fault signal, the engagement clamping plate 12 will touch the microswitch 10, thereby starting the fan 16 to cool down the power switch 3.

[0043] In order to supplement the power source of the protection mechanism 17, the following features are specifically set:

[0044] The protection mechanism 17 further includes a main electric push rod 19, a secondary electric push rod 28, a connecting support rod 20, a connecting rack 21 and a power gear 22. The main electric push rod 19 is arranged beside the transformer 4 and its fixed end is fixedly connected to the outer shell 2. The connecting support rod 20 is fixedly connected to the movable end of the main electric push rod 19. The connecting rack 21 is fixedly connected to the connecting support rod 20. The power gear 22 is arranged beside the transformer 4 and is rotatably connected to the outer shell 2 through a tooth seat. The power gear 22 meshes with the connecting rack 21. The power gear 22 is the movable end of the protection mechanism 17. The secondary electric push rod 28 is arranged above the transformer 4 and its fixed end is fixedly connected to the outer shell 2. The movable end of the secondary electric push rod 28 is fixedly connected to the insulating cover 29. When it is necessary to drive the insulating cover 29 to buckle on the transformer 4, the secondary electric push rod 28 is started and drives the insulating cover 29 to move. After the insulating cover 29 abuts against the insulating baffle 27, the main electric push rod 19 is started. The main electric push rod 19 will drive the connecting rack 21 to move through the connecting support rod 20, and the movement of the connecting rack 21 will drive the power gear 22 meshing with it to rotate.

[0045] In order to drive the insulating baffle 27 to move, and then cooperate with the insulating cover 29 to form a full-wrapping design for the transformer 4, to achieve complete isolation of the transformer 4 and prevent the arc and current from spreading, the following features are specifically set:

[0046] The protection mechanism 17 also includes two transfer pulleys 23, two power pulleys 24, two transfer gears 25 and two transfer racks 26. The two transfer pulleys 23 are rotatably arranged on both sides of the transformer 4, the two transfer pulleys 23 are coaxially arranged and fixedly connected to the movable end of the protection mechanism 17, the two power pulleys 24 are respectively arranged below the two transfer pulleys 23, the two power pulleys 24 are respectively connected to the two transfer pulleys 23 through belts, the two transfer gears 25 are respectively coaxially fixedly connected to the two power pulleys 24, the two transfer racks 26 are respectively arranged on both sides of the transformer 4, the two transfer racks 26 are respectively meshed with the two transfer gears 25, the two transfer racks 26 are respectively the two output ends of the protection mechanism 17, and the transfer racks 26 close to the outer casing 2 are fixedly connected to the insulating baffle 27. When the power gear 22 rotates, since the power gear 22 is the active end of the protection mechanism 17, the transfer pulley 23 is coaxially fixedly connected to the power gear 22, so the power gear 22 will drive the transfer pulley 23 to rotate, and the transfer pulley 23 drives the power pulley 24 to rotate through the belt, and the power pulley 24 drives the transfer gear 25 to rotate, and the transfer gear 25 drives the transfer rack 26 meshing with it to move, thereby moving the insulating baffle 27.

[0047] It should be noted that, when the insulating cover 29 covers the transformer 4, the insulating cover 29 needs to move toward the insulating baffle 27 until the end of the insulating cover 29 close to the insulating baffle 27 abuts against the insulating baffle 27. Therefore, in order to prevent the insulating cover 29 from moving before the insulating baffle 27 and causing the insulating baffle 27 to be unable to move between the housing 2 and the insulating cover 29 during subsequent movement due to deformation of the material of the end of the insulating cover 29 close to the insulating baffle 27, the insulating baffle 27 only half covers the transformer 4 when the transformer 4 is working normally. Ensure that when the insulating cover 29 covers the transformer 4, the end of the insulating cover 29 close to the insulating baffle 27 is in the extreme position and only abuts against the insulating baffle 27. At this time, even if the insulating cover 29 undergoes plastic deformation, the insulating baffle 27 can completely block the transformer 4 by moving.

[0048] In order to limit the movement of the transfer rack 26, the following features are also specifically provided:

[0049] The protection mechanism 17 further includes two limit rails 42, which are respectively arranged on both sides of the transformer 4, and the two transfer racks 26 are respectively slidably connected to the two limit rails 42. The limit rails 42 provide guidance and limit functions for the movement of the transfer rack 26, ensuring the stability and accuracy of the movement of the transfer rack 26.

[0050] In order to enhance the sealing between the insulating cover 29 and the insulating baffle 27, the following features are also specifically provided:

[0051] The protection mechanism 17 also includes a driven gear 41, a driving pulley 40, a driven pulley 39, a bevel gear rack 38, a driving bevel gear 37, a driven bevel gear 36 and a cam 35. The driven gear 41 is rotatably connected to the insulating cover 29, the driving pulley 40 is coaxially fixedly connected to the driven gear 41, the bevel gear rack 38 is arranged on the side of the driving pulley 40, the driven pulley 39 is rotatably connected to the bevel gear rack 38 and is connected to the driving pulley 40 through a belt drive, the driving bevel gear 37 is rotatably connected to the bevel gear rack 38 and is coaxially fixedly connected to the driven pulley 39, the driven bevel gear 36 is rotatably connected to the bevel gear rack 38 and meshes with the driving bevel gear 37, the cam 35 is coaxially fixedly connected to the driven bevel gear 36, and the output end of the protection mechanism 17 away from the housing 2 meshes with the driven gear 41 when moving, and the cam 35 is the free end of the protection mechanism 17. When the transfer rack 26 moves, the transfer rack 26 will drive the driven gear 41 to rotate, and the driven gear 41 will drive the cam 35 to rotate through the driving pulley 40, the driven pulley 39, the driving bevel gear 37 and the driven bevel gear 36 in turn. The rotation of the cam 35 can further adjust the connection between the insulating cover 29 and the insulating baffle 27 to enhance the sealing degree.

[0052] In order to facilitate the insulation cover 29 to be kept in close contact with the insulation baffle 27 and avoid a gap between the insulation cover 29 and the insulation baffle 27, the following features are also specifically provided:

[0053] The protection mechanism 17 also includes an insulating pressure plate 31, a connecting support plate 33, two tension springs 34 and two limiting slides 32. A limiting ring groove 30 is formed on the side of the insulating cover 29 close to the outer shell 2. The insulating pressure plate 31 is slidably connected to the limiting ring groove 30. The two limiting slides 32 are respectively slidably connected to the insulating cover 29. The limiting slide 32 is fixedly connected to the insulating pressure plate 31. The two ends of the connecting support plate 33 are respectively fixedly connected to the two limiting slides 32. The two tension springs 34 are respectively arranged on the side close to the two limiting slides 32. One end of the tension spring 34 is fixedly connected to the connecting support plate 33, and the other end is fixedly connected to the insulating cover 29. The free end of the protection mechanism 17 is against the connecting support plate 33. When the cam 35 rotates, the tension spring 34 drives the limiting slide plate 32 to move under the action of its own tension, and the limiting slide plate 32 pushes the connecting support plate 33 to make the insulating pressure plate 31 slide in the limiting ring groove 30, so that the insulating cover 29 and the insulating baffle 27 remain in a tight state.

[0054] In order to prompt the fault area so that the operator can respond to the fault area more quickly, the following features are specifically set:

[0055] The protection mechanism 17 further includes a warning light 18, which is arranged at one end of the housing 2 close to the transformer 4. The warning light 18 is electrically connected to the auxiliary electric push rod 28. When the auxiliary electric push rod 28 operates, the warning light 18 lights up to prompt the operator that a fault has occurred in this area.

[0056] The working principle of this device is that the detection device 5 continuously monitors the arc fault signal in the power switch 3. The detection device 5 is electrically connected to the power switch 3, and by collecting and analyzing the current, voltage and other parameters of the power switch 3 in real time, it judges whether there is an arc fault. When an abnormal arc appears in the power switch 3, it will cause fluctuations in current and voltage. The detection device 5 can sensitively capture these changes (the detection device 5 is a prior art, and the specific model is the ARB5-M arc protection main control unit, which is applicable to the arc protection of medium and low voltage busbars, has eight groups of arc protection functions, can accurately monitor arc signals in real time, and integrates multiple functions such as protection, measurement, control, monitoring, communication, fault recording, and event recording. It adopts a reliable fast algorithm, can judge the arc change signal and current change signal within a short time and quickly respond, and the time interval from fault discovery to outlet tripping is better than 7ms), and identifies it as an arc fault signal.

[0057] Once the detection device 5 detects an arc fault signal, it will immediately send a current pulse to the electromagnetic coil 7 in the electromagnetic drive type circuit breaker mechanism 6. After the electromagnetic coil 7 is energized, it will generate a magnetic field. Since the iron core 8 is connected to the output end of the electromagnetic coil 7, the iron core 8 will generate displacement under the action of the magnetic field. The moving contact 9 is movably arranged beside the iron core 8, and the movement of the iron core 8 will drive the moving contact 9 to move away from the static contact 15. The moving contact 9 and the static contact 15 were originally connected when the power switch 3 was working normally. When the moving contact 9 is separated from the static contact 15, the power switch 3 is opened to cut off the fault current and prevent the further expansion of the fault.

[0058] During the movement of the moving contact 9, the connecting clamping plate 12 sleeved outside the moving contact 9 will move accordingly. A micro switch 10 is arranged beside the moving contact 9, and the micro switch 10 is electrically connected to the fan 16. When the connecting clamping plate 12 triggers the micro switch 10, the fan 16 starts. Arc faults are often accompanied by the generation of a large amount of heat. After the fan 16 starts, it forcibly cools the power switch 3, which can prevent heat accumulation from causing secondary damage to surrounding components and ensure the feasibility of subsequent maintenance. In this way, the fault area can be cooled in time when a fault occurs, improving the reliability and safety of the device.

[0059] When an arc fault signal is detected, while the moving contact 9 separates from the static contact 15, the protection mechanism 17 starts to work and the insulating cover 29 is sleeved outside the transformer 4. At this time, the insulating baffle 27 abuts against the insulating cover 29, forming a full-wrap design for the transformer 4, isolating the transformer 4 from other normally operating areas, blocking the possibly spreading arc and current, and preventing the expansion of the fault. To enhance the sealing degree between the insulating cover 29 and the insulating baffle 27, with the start of the main electric push rod 19, the cam 35 will rotate and the insulating pressing plate 31 will slide in the limit ring groove 30, so that the insulating cover 29 and the insulating baffle 27 remain in a tightly abutted state, avoiding gaps, and further improving the protection effect on the transformer 4.

[0060] In the above process, when the auxiliary electric push rod 28 acts, the warning lamp 18 lights up, prompting the operator that a fault has occurred in this area, facilitating the operator to respond more quickly to the fault area and take corresponding maintenance measures in a timely manner.

[0061] The above embodiments only represent one or several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A photovoltaic energy storage inverter arc fault detection device, comprising an inverter body, a housing is provided on the outside of the inverter body, a power switch is provided at the lower end of the inverter body, a transformer fixedly connected to the housing is provided beside the power switch, and a detection device electrically connected to the power switch is provided beside the power switch, characterized in that: Also includes: An electromagnetically driven circuit breaker mechanism is arranged beside the detection device, and the electromagnetically driven circuit breaker mechanism includes an electromagnetic coil, an iron core, a moving contact and a stationary contact. The electromagnetic coil is arranged beside the detection device and is electrically connected to the detection device. After the detection device detects the arc fault signal in the power switch, it immediately sends a current pulse to the electromagnetic coil. The electromagnetic coil is energized to generate a magnetic field. The iron core is connected to the output end of the electromagnetic coil. The moving contact is movably arranged beside the iron core, and the stationary contact is arranged on the side of the moving contact away from the iron core. The moving contact and the stationary contact are connected when the power switch is faulty. After the electromagnetic coil is energized, the moving contact is driven by the iron core to move in a direction away from the static contact. A fan is arranged beside the power switch. After the fan is started, the power switch is cooled. A protection mechanism is arranged beside the transformer. The protection mechanism includes an insulating cover and an insulating baffle. The insulating cover is slidably arranged beside the transformer. When the moving contact and the static contact are separated, the insulating cover moves toward the direction close to the transformer and is sleeved on the outside of the transformer. The insulating baffle is slidably arranged on the side of the transformer away from the insulating cover. When the insulating cover is sleeved on the outside of the transformer, the insulating baffle abuts against the insulating cover. The electromagnetically driven circuit breaker mechanism also includes a positioning seat, a reset spring and a circular iron sheet. The positioning seat is arranged beside the iron core and is fixedly connected to the housing. The moving contact is slidably connected to the positioning seat. The circular iron sheet is fixedly connected to one end of the moving contact away from the static contact. The reset spring is sleeved on the outside of the moving contact. One end of the reset spring is fixedly connected to the circular iron sheet, and the other end is fixedly connected to the positioning seat. The outer sleeve of the moving contact is provided with a connecting card plate, and a micro switch is provided on the side of the moving contact. The micro switch is electrically connected to the fan. When the moving contact moves, the connecting card plate is driven to trigger the micro switch. The protection mechanism also includes a main electric push rod, an auxiliary electric push rod, a connecting support rod, a connecting rack and a power gear. The main electric push rod is arranged on the side of the transformer and the fixed end is fixedly connected to the shell. The connecting support rod is fixedly connected to the movable end of the main electric push rod. The connecting rack is fixedly connected to the connecting support rod. The power gear is arranged on the side of the transformer and is rotatably connected to the shell through a gear seat. The power gear is meshed with the connecting rack. The power gear is the movable end of the protection mechanism. The auxiliary electric push rod is arranged above the transformer and the fixed end is fixedly connected to the shell. The movable end of the auxiliary electric push rod is fixedly connected to the insulating cover.

2. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: The protection mechanism also includes two transfer pulleys, two power pulleys, two transfer gears and two transfer racks. The two transfer pulleys are rotatably arranged on both sides of the transformer, the two transfer pulleys are coaxially arranged and fixedly connected to the movable end of the protection mechanism, the two power pulleys are respectively arranged below the two transfer pulleys, the two power pulleys are respectively connected to the two transfer pulleys through belts, the two transfer gears are respectively coaxially fixedly connected to the two power pulleys, the two transfer racks are respectively arranged on both sides of the transformer, the two transfer racks are respectively meshed with the two transfer gears, the two transfer racks are respectively two output ends of the protection mechanism, and the transfer rack close to the outer casing is fixedly connected to the insulating baffle.

3. The photovoltaic energy storage inverter arc fault detection device according to claim 2, characterized in that: The protection mechanism also includes two limit slide rails, which are respectively arranged on both sides of the transformer, and the two transfer racks are respectively slidably connected to the two limit slide rails.

4. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: The protection mechanism also includes a driven gear, a driving pulley, a driven pulley, a bevel gear frame, a driving bevel gear, a driven bevel gear and a cam. The driven gear is rotatably connected to the insulating cover, the driving pulley is coaxially fixedly connected to the driven gear, the bevel gear frame is arranged on the side of the driving pulley, the driven pulley is rotatably connected to the bevel gear frame and is connected to the driving pulley through a belt drive, the driving bevel gear is rotatably connected to the bevel gear frame and coaxially fixedly connected to the driven pulley, the driven bevel gear is rotatably connected to the bevel gear frame and meshes with the driving bevel gear, the cam is coaxially fixedly connected to the driven bevel gear, and the output end of the protection mechanism away from the housing meshes with the driven gear when moving, and the cam is the free end of the protection mechanism.

5. The photovoltaic energy storage inverter arc fault detection device according to claim 4, characterized in that: The protection mechanism also includes an insulating pressure plate, a connecting support plate, two tension springs and two limit slides. A limit ring groove is formed on the side of the insulating cover close to the outer shell. The insulating pressure plate is slidably connected to the limit ring groove. The two limit slides are respectively slidably connected to the insulating cover. The limit slide is fixedly connected to the insulating pressure plate. The two ends of the connecting support plate are respectively fixedly connected to the two limit slides. The two tension springs are respectively arranged on the side close to the two limit slides. One end of the tension spring is fixedly connected to the connecting support plate, and the other end is fixedly connected to the insulating cover. The free end of the protection mechanism is against the connecting support plate.

6. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: The protection mechanism also includes a warning light, which is arranged at one end of the shell close to the transformer and is electrically connected to the auxiliary electric push rod.

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