Photovoltaic energy storage inverter arc fault detection device

Abstract

The invention relates to the field of inverter fault detection, in particular to a photovoltaic energy storage inverter arc fault detection device. Comprising an inverter body and a shell sleeved outside the inverter body, a power switch is arranged at the lower end of the inverter body, a transformer fixedly connected with the shell is arranged beside the inverter body, and a detection device electrically connected with the power switch is further arranged. An electromagnetic drive type circuit breaking mechanism is arranged beside the detection device and comprises 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, a current pulse is generated to the electromagnetic coil to enable the electromagnetic coil to be electrified to generate a magnetic field, the iron core drives the moving contact to be away from the static contact, and a fan for cooling is arranged beside the power switch. A protection mechanism is arranged beside the transformer and 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 protection role. The device can detect the fault in the inverter, and can cool and insulate the fault area.

Description

Technical Field

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

[0002] Photovoltaic inverters can convert the variable DC voltage generated by photovoltaic solar panels into AC power at the mains frequency, which can be fed back to the commercial power transmission system or used by off-grid power grids. However, in the existing technology, the weak signal at the beginning of the arc fault is difficult to be captured in time, resulting in the failure to detect and handle the fault in the early stage, which may lead to more serious accidents. When an arc fault occurs, it cannot be detected in time, which will cause the fault to continue to develop and cause irreversible damage to the components of the inverter.

[0003] Secondly, after an arc fault occurs, the circuit breaker protection measures are not quick and reliable enough. The existing circuit breaker mechanism has a long response time and cannot cut off the fault current in a short time, which will cause the fault range to expand, affect the normal operation of the inverter, and may even cause damage to the entire photovoltaic energy storage system. Moreover, some circuit breakers are prone to failure after repeated use and have poor reliability.

[0004] Furthermore, heat dissipation is also a major pain point of existing devices. Arc faults are often accompanied by the generation of a large amount of heat, and existing devices lack an effective heat dissipation mechanism. Heat accumulates in the fault area, causing secondary damage to surrounding components, reducing the service life of the inverter, and also increasing the difficulty and cost of maintenance.

[0005] Finally, the existing technology does not provide sufficient protection for key components such as transformers. When an arc fault occurs, the transformer is easily affected by the arc and current, and the existing protection device cannot effectively isolate the transformer from the fault area, 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 a photovoltaic energy storage inverter arc fault detection device to address the existing technical problems.

[0007] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: The photovoltaic energy storage inverter arc fault detection device includes an inverter body, a shell 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 shell is provided beside the power switch, a detection device electrically connected to the power switch is provided beside the power switch, and 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 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 is abutted against the insulating cover.

[0008] Furthermore, the electromagnetically driven circuit breaking mechanism also includes a positioning seat, a reset spring and a circular iron sheet. The positioning seat is arranged on the side of the iron core and is fixedly connected to the outer shell. 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.

[0009] Furthermore, a connecting card plate is provided on the outer sleeve of the moving contact, and a micro switch is provided on the side of the moving contact. The micro switch is electrically connected to the fan, and when the moving contact moves, the connecting card plate is driven to trigger the micro switch.

[0010] Furthermore, 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 outer 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 outer 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 outer shell, and the movable end of the auxiliary electric push rod is fixedly connected to the insulating cover.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] Compared with the prior art, the present invention has the following beneficial effects: First, the photovoltaic energy storage inverter arc fault detection device of the present invention has a highly sensitive arc fault detection function. The detection device is closely connected with the power switch and can collect the current, voltage and other parameters of the power switch in real time and accurately. Through advanced algorithms and sensor technology, even the weak signal at the initial stage of the arc fault can be quickly captured. Compared with the existing devices, the timeliness and accuracy of fault detection are greatly improved, which enables the operator to know the situation at the first time of the fault and take measures in time to avoid further deterioration of the fault, thereby ensuring the stable operation of the photovoltaic energy storage inverter and reducing the losses caused by the fault. Second, the electromagnetically driven circuit breaker mechanism of the 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, and the electromagnetic coil is quickly energized to generate a magnetic field, driving the iron core and the moving contact to move quickly, thereby realizing a fast circuit breaker of the power switch. Compared with the existing device, the circuit breaker 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 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, thereby improving the reliability and repeatability of the device. Third: The heat dissipation function of this device is significantly improved. When the moving contact moves, the micro switch is triggered by the connecting card, so that the fan is immediately started to force the heat dissipation of the power switch. In the case of a large amount of heat generated by an arc fault, 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 feasibility of subsequent maintenance of the inverter, reduces the maintenance cost and difficulty, and improves the reliability and stability of the entire photovoltaic energy storage system. Fourthly: This device provides perfect protection for the transformer. The protection mechanism, through the coordinated work of a series of components such as the main electric push rod, the auxiliary electric push rod, the transfer pulley, the power pulley, the transfer gear and the transfer rack, can quickly move the insulating cover and the insulating baffle into place when an arc fault occurs, forming a full-wrapped design for the transformer, completely isolating the transformer from other normal operating areas, blocking possible arcs and currents, and preventing the transformer from being affected by the fault. Compared with existing devices, it greatly reduces the risk of transformer damage, ensures the safety of the core components of the entire photovoltaic energy storage system, and improves the stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment; Figure 2 is a schematic diagram of a three-dimensional structure decomposition of an embodiment; Figure 3Schematic diagram of the three-dimensional structure of the electromagnetic driven circuit breaker mechanism in the embodiment; Figure 4 yes Figure 3 A magnified view of the structure at center; Figure 5 Schematic diagram of the three-dimensional structure of the electromagnetic driven circuit breaker mechanism and the protection mechanism in the embodiment; Figure 6 is a front view of the electromagnetically driven circuit breaker mechanism in the embodiment; Figure 7 is a schematic diagram of the three-dimensional structure of the protection mechanism in the embodiment; Figure 8 is a schematic diagram of the three-dimensional structure of the protection mechanism in another angle in the embodiment; Fig. 9 yes Figure 8 Enlarged view of the structure at point B in the middle.

[0018] The numbers in the figure are: 1. Inverter body; 2. Housing; 3. Power switch; 4. Transformer; 5. Detection device; 6. Electromagnetic driven circuit breaker; 7. Electromagnetic coil; 8. Iron core; 9. Moving contact; 10. Micro switch; 11. Positioning seat; 12. Connecting card; 13. Reset spring; 14. Round 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 pulley; 24, power pulley; 25, transfer gear; 26, transfer rack; 27, insulating baffle; 28, auxiliary electric push rod; 29, insulating cover; 30, limit ring groove; 31, insulating pressure plate; 32, limit slide plate; 33, connecting support plate; 34, tightening tension spring; 35, cam; 36, driven bevel gear; 37, active bevel gear; 38, bevel gear rack; 39, driven pulley; 40, active pulley; 41, driven gear; 42, limit slide rail. DETAILED DESCRIPTION

[0019] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] refer to Figures 1 to 9 , a photovoltaic energy storage inverter arc fault detection device, comprising an inverter body 1, an outer shell 2 is provided on the outside of the inverter body 1, a power switch 3 is provided at the lower end of the inverter body 1, a transformer 4 fixedly connected to the shell 2 is provided beside the power switch 3, a detection device 5 electrically connected to the power switch 3 is provided beside the power switch 3, and also includes: An electromagnetically driven circuit breaker mechanism 6 is arranged beside the detection device 5. The electromagnetically driven circuit breaker mechanism 6 includes an electromagnetic coil 7, an iron core 8, a moving contact 9 and a stationary contact 15. The electromagnetic coil 7 is arranged beside the detection device 5 and is electrically connected to the detection device 5. After the detection device 5 detects the 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 stationary contact 15 is arranged on the side of the moving contact 9 away from the iron core 8 (such as Figure 6 As shown in the figure, the moving contact 9 and the static contact 15 are connected when the power switch 3 is working normally. After the electromagnetic coil 7 is energized, the moving contact 9 is driven by the iron core 8 to move in the direction away from the static contact 15. A fan 16 is arranged beside the power switch 3. After the fan 16 is started, the power switch 3 is cooled. 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 toward the direction close to the transformer 4 and is sleeved on the outside of the transformer 4. The insulating baffle 27 is slidably arranged on the side of the transformer 4 away from the insulating cover 29. The insulating baffle 27 abuts against the insulating cover 29 when the insulating cover 29 is sleeved on the outside of the transformer 4.

[0021] When the device is in operation, 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, which attracts the iron core 8 to drive the moving contact 9 to quickly separate from the static contact 15, thereby realizing a rapid circuit breaker of the power switch 3. At the same time, the fan 16 forcibly dissipates heat in the fault area. Because arc faults are often accompanied by a large amount of heat generation, rapid heat dissipation can prevent heat accumulation from causing secondary damage to surrounding components, thereby ensuring the feasibility of subsequent maintenance of the inverter.

[0022] 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 spread of arcs and currents and preventing the fault from expanding.

[0023] In order to limit the movement of the moving contact 9, the following features are also specifically provided: The electromagnetically driven circuit breaker mechanism 6 also includes a positioning seat 11, a reset spring 13 and a circular iron sheet 14. The positioning seat 11 is arranged beside the iron core 8 and is fixedly connected to the housing 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 spring 13 is sleeved on the outside of the moving contact 9. One end of the reset 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 spring 13 is stretched. When the electromagnetic coil 7 is de-energized after the fault is eliminated, the tension of the reset spring 13 will return the moving contact 9 to its initial position. The positioning seat 11 provides a stable track for the movement of the moving contact 9 to ensure the accuracy of the movement of the moving contact 9.

[0024] In order to trigger the fan 16 to forcibly dissipate heat for the failed power switch 3, prevent heat accumulation from damaging surrounding components, and ensure the feasibility of subsequent maintenance, the following features are specifically set: The outer sleeve of the moving contact 9 is provided with a connection card plate 12, and a micro switch 10 is provided beside the moving contact 9. The micro switch 10 is electrically connected to the fan 16. When the moving contact 9 moves, the connection card plate 12 is driven to trigger the micro switch 10. When the moving contact 9 moves due to an arc fault signal, the connection card plate 12 will trigger the micro switch 10, thereby starting the fan 16 to cool the power switch 3.

[0025] In order to supplement the power source of the protection mechanism 17, the following features are also specifically provided: The protection mechanism 17 also includes a main electric push rod 19, an auxiliary electric push rod 28, a connecting rod 20, a connecting rack 21 and a power gear 22. The main electric push rod 19 is arranged on the side of the transformer 4 and the fixed end is fixedly connected to the outer shell 2. The connecting 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 rod 20. The power gear 22 is arranged on the side of the transformer 4 and is rotatably connected to the outer shell 2 through a gear seat. The power gear 22 is meshed with the connecting rack 21. The power gear 22 is the movable end of the protection mechanism 17. The auxiliary electric push rod 28 is arranged above the transformer 4 and the fixed end is fixedly connected to the outer shell 2. The movable end of the auxiliary electric push rod 28 is fixedly connected to the insulating cover 29. When it is necessary to drive the insulating cover 29 to be pressed onto the transformer 4, the auxiliary electric push rod 28 starts 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 starts. The main electric push rod 19 will drive the connecting rack 21 to move through the connecting support rod 20. The movement of the connecting rack 21 will drive the power gear 22 meshing with it to rotate.

[0026] 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: 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.

[0027] 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.

[0028] In order to limit the movement of the transfer rack 26, the following features are also specifically provided: 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.

[0029] In order to enhance the sealing between the insulating cover 29 and the insulating baffle 27, the following features are also specifically provided: 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.

[0030] 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: 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.

[0031] In order to provide prompts for the fault area so that operators can respond to the fault area more quickly, the following features are also set: The protection mechanism 17 also includes a warning light 18, which is arranged at one end of the housing 2 close to the transformer 4, and the warning light 18 is electrically connected to the auxiliary electric push rod 28. When the auxiliary electric push rod 28 moves, the warning light 18 lights up to prompt the operator that a fault has occurred in the area.

[0032] The working principle of this device is that the detection device 5 monitors the arc fault signal in the power switch 3 at all times. The detection device 5 is electrically connected to the power switch 3, and determines whether there is an arc fault by real-time acquisition and analysis of the current, voltage and other parameters of the power switch 3. When an abnormal arc occurs in the power switch 3, it will cause fluctuations in current and voltage, and the detection device 5 can keenly capture these changes (the detection device 5 is a prior art, the specific model is the ARB5-M arc protection main control unit, which is suitable for 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 protection, measurement, control, monitoring, communication, fault recording, event recording and other functions. It uses a reliable and fast algorithm, which can judge arc change signals and current change signals in a short time and respond quickly, and the time interval from fault detection to output tripping is better than 7ms), and identify it as an arc fault signal.

[0033] Once the detection device 5 detects an arc fault signal, it will immediately send a current pulse to the electromagnetic coil 7 in the electromagnetically driven circuit breaker mechanism 6. When the electromagnetic coil 7 is energized, a magnetic field will be generated. Since the iron core 8 is connected to the output end of the electromagnetic coil 7, the iron core 8 will be displaced under the action of the magnetic field. The moving contact 9 is movably arranged beside the iron core 8. 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 are originally connected when the power switch 3 is working normally. When the moving contact 9 is separated from the static contact 15, the power switch 3 is disconnected, thereby cutting off the fault current and preventing the fault from further expanding.

[0034] During the movement of the moving contact 9, the connecting card plate 12 mounted on the outside of the moving contact 9 will move accordingly. A micro switch 10 is arranged on the side of the moving contact 9, and the micro switch 10 is electrically connected to the fan 16. When the connecting card 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 is started, the power switch 3 is forced to dissipate heat, 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, thereby improving the reliability and safety of the device.

[0035] When an arc fault signal is detected and the moving contact 9 is separated from the static contact 15, the protection mechanism 17 starts to work and the insulating cover 29 is sleeved on the outside of the transformer 4. At this time, the insulating baffle 27 and the insulating cover 29 are against each other, forming a full-wrapped design for the transformer 4, isolating the transformer 4 from other normal operating areas, blocking the arc and current that may spread, and preventing the fault from expanding. In order to strengthen the sealing between the insulating cover 29 and the insulating baffle 27, as the main electric push rod 19 is started, the cam 35 will rotate and make the insulating pressure plate 31 slide in the limiting ring groove 30, so that the insulating cover 29 and the insulating baffle 27 are kept in a tight state, avoiding the existence of gaps, and further improving the protection effect of the transformer 4.

[0036] In the above process, when the auxiliary electric push rod 28 moves, the warning light 18 lights up to remind the operator that a fault has occurred in the area, so that the operator can respond to the fault area more quickly and take corresponding maintenance measures in time.

[0037] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached 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 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 is abutted against the insulating cover.

2. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: The electromagnetically driven circuit breaker mechanism also includes a positioning seat, a reset spring and a circular iron sheet. The positioning seat is arranged on the side of the iron core and is fixedly connected to the shell. 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.

3. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: The outer sleeve of the moving contact is provided with a connecting card plate, and a micro switch is arranged 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.

4. The photovoltaic energy storage inverter arc fault detection device according to claim 1, characterized in that: 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.

5. The photovoltaic energy storage inverter arc fault detection device according to claim 4, 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.

6. The photovoltaic energy storage inverter arc fault detection device according to claim 5, 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.

7. 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.

8. The photovoltaic energy storage inverter arc fault detection device according to claim 7, 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.

9. 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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