A combined low-voltage reactive power compensation device and working method

Abstract

The present invention relates to the technical field of compensation devices, specifically a combined low-voltage reactive power compensation device and a working method, which includes a low-voltage reactive power compensation device body and a capacitor bank. An assembly frame is installed inside the low-voltage reactive power compensation device body, and a fixed crossbar is fixedly connected to the outer surface of the assembly frame. A high-temperature protection mechanism is arranged on the fixed crossbar. Through the integrated cooperation of the high-temperature protection mechanism and the fire extinguishing mechanism, each capacitor element is installed at intervals, and the design of the heat dissipation plate is used to achieve efficient heat dissipation when the capacitor bank is in use. Once a certain capacitor bank fails or catches fire, the mounting frame connecting the capacitor bank quickly reacts and drops into the isolation box for separate isolation to prevent the adjacent capacitor bank from being damaged. And after the capacitor bank drops, it triggers the fire extinguishing mechanism at the bottom of the inner cavity of the isolation box to eject the fire extinguishing powder, quickly suppress the fire source, and prevent the fire from spreading to adjacent capacitors and other electrical components.

Description

Technical Field

[0001] The present invention relates to the technical field of compensation devices, and particularly to a combined low-voltage reactive power compensation device and a working method thereof. Background Art

[0002] In a power system, due to the existence of a large number of inductive loads (such as motors, transformers, etc.), a large amount of reactive power will be generated. The existence of reactive power will not only reduce the power factor of the power grid, increase line losses, but also affect the voltage stability of the power grid. Therefore, compensating the power grid through a reactive power compensation device is an important means to improve the operation efficiency and economy of the power grid.

[0003] In the prior art, for example, a combined low-voltage reactive power compensation complete set device with convenient installation, with the publication number of CN221102715U, includes an equipment body. An upper door is rotatably connected to the outer wall of the equipment body, and a lower door is rotatably connected to the outer wall of the equipment body. An installation frame is fixedly assembled in the inner cavity of the equipment body. A slide rod is fixedly assembled on the outer wall of the installation frame, and a lead screw is rotatably connected to the outer wall of the installation frame. By providing the installation frame, the lead screw, the knob, and the clamping plate, when it is necessary to fix the capacitor, directly place the capacitor on the top of the installation frame. At this time, rotate the knob, and the clamping plate and the fixing plate can move inward under the drive of the lead screw. During the inward movement, the capacitor can be fixed, and it is not necessary to install the capacitors one by one, which is very convenient and fast.

[0004] In order to avoid damage to the capacitor caused by high temperature, a method of setting air ducts and cooling motors on the outer walls on both sides of the equipment body is adopted. However, in the actual use process, when a fire occurs locally in a single capacitor, if there is a lack of an effective blocking mechanism, the fire may quickly spread to adjacent capacitors and other electrical components, resulting in the parallel damage of the entire low-voltage reactive power compensation device, thereby affecting its use effect.

[0005] Therefore, the present invention proposes a combined low-voltage reactive power compensation device and a working method thereof to solve the problem that the existing device lacks an effective blocking mechanism, which easily leads to the parallel damage of the entire low-voltage reactive power compensation device and is inconvenient to maintain. It can reasonably arrange the installation of capacitors, ensure convenient maintenance when the capacitor fails, and avoid damage to normal electrical components on the side. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a combined low-voltage reactive power compensation device and a working method thereof, which have the advantages of being able to reasonably arrange the installation of capacitors, ensuring convenient maintenance when the capacitor fails, and avoiding damage to normal electrical components on the side.

[0007] To achieve the above object, the present invention provides the following technical solutions: On the one hand, a combined low-voltage reactive power compensation device includes a low-voltage reactive power compensation device body and a capacitor bank. An assembly frame is installed inside the low-voltage reactive power compensation device body. A fixed crossbar is fixedly connected to the outer surface of the assembly frame. A high-temperature protection mechanism is arranged on the fixed crossbar. The high-temperature protection mechanism includes a mounting frame and an isolation box. An avoidance groove is opened on the inner wall of the fixed crossbar. The capacitor bank is fixedly installed inside the mounting frame. Heat dissipation plates are respectively fixedly installed on both sides of the capacitor bank. The heat dissipation plates are fixedly installed inside the fixed crossbar. The isolation box is fixedly installed directly below the mounting frame. An isolation bottom plate is fixedly installed on the bottom surface of the inner cavity of the isolation box. A receiving groove is opened on the upper inner wall of the isolation bottom plate. A fire extinguishing mechanism is arranged on the inner surface of the receiving groove. The fire extinguishing mechanism includes a receiving cylinder. Mounting side plates are respectively arranged on the outer surfaces of both sides of the mounting frame. The mounting side plates are fixedly installed on the upper surface of the fixed crossbar.

[0008] Preferably, a convex plate is fixedly connected to the outer surface of the mounting side plate. A reserved groove is opened inside the mounting side plate. A T-shaped lock block is slidably installed on the inner wall of the reserved groove. The T-shaped lock block is integrally in a "T" - shaped block structure. A trapezoidal groove is opened on the inner wall of one end of the T-shaped lock block. A fuse release assembly is movably connected inside the trapezoidal groove.

[0009] Preferably, the fuse release assembly includes a guiding plate and a trapezoidal insertion block. The outer surface of the trapezoidal insertion block is movably inserted into the inner surface of the trapezoidal groove. The guiding plate is fixedly installed on the outer surface of the inner side of the mounting side plate. One end of the guiding plate is fixedly connected to a fuse piece and a shape memory alloy. There are two groups of shape memory alloys which are symmetrically distributed about the horizontal central axis of the fuse piece. The other ends of the fuse piece and the shape memory alloy are respectively fixedly connected to the outer surface of the trapezoidal insertion block.

[0010] Preferably, a reset avoidance assembly is arranged at the end of the T-shaped lock block away from the trapezoidal insertion block. The reset avoidance assembly includes a reset spring. There are two groups of reset springs. One ends of the two groups of reset springs are fixedly connected to the outer surface of the T-shaped lock block. The other ends of the reset springs are respectively fixedly connected to the inner surface of the convex plate.

[0011] Preferably, the mounting frame is integrally in a "C" - shaped plate structure. The outer surfaces of both ends of the mounting frame are respectively slidably connected to the inner sides of the mounting side plates. Side grooves are respectively opened on the outer surfaces of both sides of the mounting frame. Slots are opened through the lower ends of the side grooves. The inner surfaces of the slots and the side grooves are respectively movably connected to the outer surface of the T-shaped lock block.

[0012] Preferably, mounting bases I and II are movably mounted on the outer surface of the upper end of the mounting frame. Fixing bolts penetrate through both ends of mounting bases I and II respectively, and mounting bases I and II are fixedly connected through the fixing bolts.

[0013] Preferably, an inert gas storage bladder is arranged on the bottom surface of the inner cavity of the receiving cylinder. A flange seat is fixedly connected to the outer surface of the upper end of the receiving cylinder. A sliding sleeve is movably mounted inside the flange seat. An outer edge is fixedly mounted on the upper end of the sliding sleeve. An arc-shaped elastic piece is fixedly connected to the lower surface of the outer edge. There are multiple groups of arc-shaped elastic pieces, which are arranged in an equidistant array about the central axis of the sliding sleeve, and the other ends of the arc-shaped elastic pieces are fixedly connected to the upper surface of the flange seat respectively.

[0014] Preferably, a puncturing assembly is arranged inside the sliding sleeve. The puncturing assembly includes a connecting plate and a conical cover. The conical cover is fixedly mounted on the lower surface of the connecting plate. The outer surface of the connecting plate is fixedly connected to the inner ring surface of the sliding sleeve. Diffusion holes are formed in the inner wall of the conical cover, and a circular through hole is formed in the central inner wall of the connecting plate.

[0015] Preferably, a thimble is fixedly mounted at the lower end of the conical cover, and the outer surface of the thimble is movably connected to the upper surface of the inert gas storage bladder.

[0016] On the other hand, a working method of a combined low-voltage reactive power compensation device includes the following steps:

[0017] S1. Install the capacitor banks separately at intervals, and install heat dissipation plates between adjacent capacitor banks;

[0018] S2. When a fault occurs in the capacitor bank and its temperature exceeds a predetermined threshold, the fuse release assembly installed inside the installation side plate is activated by the high temperature and releases the restriction on the T-shaped lock block;

[0019] S3. After the fuse is released, the T-shaped lock block quickly retracts under the action of the reset avoidance assembly, disengages from the restriction on the mounting frame, and falls into the isolation box below under the action of gravity;

[0020] S4. When the capacitor bank falls into the isolation box, its bottom contacts the isolation bottom plate and triggers the puncturing assembly, puncturing the inert gas storage bladder to release inert gas, filling the inner cavity of the fire extinguishing cavity isolation box, and controlling the fire in time.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] A combined low-voltage reactive power compensation device and working method proposed by the present invention integrate and cooperate with a high-temperature protection mechanism and a fire extinguishing mechanism, install each capacitor element at intervals, and cooperate with the design of a heat dissipation plate to achieve efficient heat dissipation during the use of the capacitor bank. Once a certain capacitor bank fails or catches fire, the mounting frame connecting the capacitor bank quickly responds and drops into the isolation box for separate isolation, preventing the adjacent capacitor banks from being damaged; and after the capacitor bank drops, it triggers the fire extinguishing mechanism at the bottom of the inner cavity of the isolation box to eject fire extinguishing powder, quickly suppressing the fire source and preventing the fire from spreading to adjacent capacitors and other electrical components, reducing the risk of parallel damage suffered by the overall device due to local failures. It not only solves the problem of the lack of an effective blocking mechanism in the prior art, but also provides a strong guarantee for the safe and efficient operation of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structural schematic diagram of the low-voltage reactive power compensation device body of the present invention;

[0024] Figure 2 is an open-state structural schematic diagram of the low-voltage reactive power compensation device body of the present invention;

[0025] Figure 3 is a connection structural schematic diagram of the fixed crossbar and the high-temperature protection mechanism of the present invention;

[0026] Figure 4 is a state structural schematic diagram of the capacitor bank dropping into the isolation box of the present invention;

[0027] Figure 5 is a side cross-sectional structural schematic diagram of the capacitor bank dropping into the isolation box of the present invention;

[0028] Figure 6 of the present invention Figure 5 is an enlarged structural schematic diagram at A;

[0029] Figure 7 is a disassembly and assembly structural schematic diagram of the capacitor bank and the mounting frame of the present invention;

[0030] Figure 8 is a horizontal cross-sectional structural schematic diagram of the mounting side plate of the present invention;

[0031] Figure 9 of the present invention Figure 8 is an enlarged structural schematic diagram at B;

[0032] Figure 10 is a partial cross-sectional structural schematic diagram of the isolation bottom plate and the fire extinguishing mechanism of the present invention;

[0033] Figure 11 of the present invention Figure 10Schematic diagram of the enlarged structure at C;

[0034] Figure 12 Is a partial three-dimensional structure diagram of the fire extinguishing mechanism of the present invention;

[0035] Figure 13 Is a flow chart of the present invention.

[0036] In the figure: 1. Low-voltage reactive power compensation device body; 2. Assembly frame; 3. Fixed cross bar; 30. Avoidance groove; 4. Capacitor bank; 41. Mounting seat one; 42. Mounting seat two; 43. Fixing bolt; 5. Mounting frame; 50. Side groove; 500. Slot; 6. Mounting side plate; 7. Isolation box; 8. Heat dissipation plate; 61. Convex plate; 60. Reserved groove; 62. T-shaped lock block; 621. Return spring; 620. Trapezoidal groove; 63. Guide plate; 631. Fuse piece; 632. Trapezoidal insert block; 633. Shape memory alloy; 9. Isolation bottom plate; 90. Receiving groove; 10. Receiving cylinder; 101. Inert gas storage capsule; 102. Flange seat; 103. Arc-shaped elastic piece; 104. Sliding sleeve; 105. Connecting plate; 106. Conical cover; 107. Thimble; 108. Diffusion hole. Detailed implementation manners

[0037] In order to clearly and completely describe the purpose, technical solution of the present invention, and make the advantages more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0038] Embodiment 1

[0039] Please refer to Figures 1-13, the present invention provides a technical solution: a combined low-voltage reactive power compensation device, which includes a low-voltage reactive power compensation device body 1 and a capacitor bank 4. An assembly frame 2 is installed inside the low-voltage reactive power compensation device body 1. A fixed crossbar 3 is fixedly connected to the outer surface of the assembly frame 2. A high-temperature protection mechanism is arranged on the fixed crossbar 3. The high-temperature protection mechanism includes an installation frame 5 and an isolation box 7. An avoidance groove 30 is opened on the inner wall of the fixed crossbar 3. The capacitor bank 4 is fixedly installed inside the installation frame 5. Heat dissipation plates 8 are respectively fixedly installed on both sides of the capacitor bank 4. The heat dissipation plates 8 are fixedly installed inside the fixed crossbar 3. The isolation box 7 is fixedly installed directly below the installation frame 5. An isolation bottom plate 9 is fixedly installed on the inner bottom surface of the isolation box 7. A receiving groove 90 is opened on the upper inner wall of the isolation bottom plate 9. A fire extinguishing mechanism is arranged on the inner surface of the receiving groove 90. The fire extinguishing mechanism includes a receiving cylinder 10. Installation side plates 6 are respectively arranged on the outer surfaces of both sides of the installation frame 5. The installation side plates 6 are fixedly installed on the upper surface of the fixed crossbar 3; through the integrated cooperation of the high-temperature protection mechanism and the fire extinguishing mechanism, the capacitor elements are installed at intervals, and with the design of the heat dissipation plate 8, efficient heat dissipation during the use of the capacitor bank 4 is achieved. Once a certain capacitor bank 4 fails or catches fire, the installation frame 5 connected to the capacitor bank 4 quickly reacts and drops into the isolation box 7 for separate isolation, preventing the adjacent capacitor bank 4 from being damaged; and after the capacitor bank 4 drops, it triggers the fire extinguishing mechanism at the bottom of the inner cavity of the isolation box 7, realizing the ejection of fire extinguishing powder, quickly suppressing the fire source, preventing the fire from spreading to adjacent capacitors and other electrical components, reducing the risk of parallel damage suffered by the overall device due to local failures, not only solving the problem of the lack of an effective blocking mechanism in the prior art, but also providing a strong guarantee for the safe and efficient operation of the power system.

[0040] Embodiment Two

[0041] Referring to the appendix Figures 1-13 , on the basis of Embodiment One, in order to achieve the single-group installation of the capacitor bank 4: mounting seats one 41 and two 42 are respectively movably installed on the upper outer surface of the mounting frame 5. Fixing bolts 43 respectively penetrate through both ends of the mounting seat one 41 and the mounting seat two 42. The mounting seat one 41 and the mounting seat two 42 are fixedly connected through the fixing bolts 43;

[0042] The multiple groups of capacitor banks 4 are separated and installed. The mounting seat one 41 and the mounting seat two 42 are detachably installed by using the fixing bolts 43, and the mounting seat one 41 and the mounting seat two 42 are connected to the mounting frame 5. When it is necessary to separately install or disassemble and maintain the capacitor bank 4, turn the fixing bolts 43 to detach the mounting seat one 41 and the mounting seat two 42 from the mounting frame 5.

[0043] Embodiment Three

[0044] Referring to the appendix Figures 1-13, on the basis of the second embodiment, in order to achieve that a capacitor bank 4 at a certain position fails and quickly makes an isolation reaction: a convex plate 61 is fixedly connected to the outer surface of the installation side plate 6, a reserved groove 60 is formed on the inner wall of the installation side plate 6, a T-shaped lock block 62 is slidably installed on the inner wall of the reserved groove 60, the T-shaped lock block 62 is integrally in a "T" - shaped block structure, a trapezoidal groove 620 is formed on the inner wall of one end of the T-shaped lock block 62, and a fuse release component is movably connected inside the trapezoidal groove 620; the fuse release component includes a guide plate 63 and a trapezoidal insertion block 632, the outer surface of the trapezoidal insertion block 632 is movably inserted into the inner surface of the trapezoidal groove 620, the guide plate 63 is fixedly installed on the outer surface of the inner side of the installation side plate 6, a fuse piece 631 and a shape memory alloy 633 are fixedly connected to one end of the guide plate 63, there are two groups of shape memory alloys 633 which are symmetrically distributed about the horizontal central axis of the fuse piece 631, and the other ends of the fuse piece 631 and the shape memory alloy 633 are respectively fixedly connected to the outer surface of the trapezoidal insertion block 632;

[0045] When a single capacitor bank 4 reacts, its own temperature exceeds a predetermined threshold, causing the temperature around the capacitor bank 4 to rise. At this time, the fuse piece 631 installed on the inner side of the installation side plate 6 is melted due to the high temperature, and at this time, the shape memory alloys 633 on both sides of the fuse piece 631 return to a curved shape due to the high temperature. The two groups of shape memory alloys 633 retract, so that the trapezoidal insertion block 632 originally inserted inside the trapezoidal groove 620 is pulled out. In this way, the trapezoidal insertion block 632 releases the restriction on the T-shaped lock block 62. It should be noted that when the capacitor bank 4 is in a normal use state, the temperature around the capacitor bank 4 and the inner side of the installation side plate 6 is normal. The trapezoidal insertion block 632 is inserted into the inner wall of the trapezoidal groove 620 on both sides of the T-shaped lock block 62 under the mutual cooperation of the fuse piece 631 and the shape memory alloy 633 to ensure the locking of the T-shaped lock block 62 and prevent one end of the T-shaped lock block 62 from detaching from the inner wall of the slot 500; once the fuse release component is activated, the T-shaped lock block 62 can release the restriction on the slot 500.

[0046] Embodiment Four

[0047] Refer to the appendix Figures 1-13On the basis of the third embodiment, in order to realize the rapid retraction of the T-shaped locking block 62 inside the slot 500 and ensure the falling of the mounting frame 5 and the inner capacitor bank 4: a reset avoidance component is provided at one end of the T-shaped locking block 62 away from the trapezoidal plug block 632, and the reset avoidance component includes a reset spring 621, and two groups of reset springs 621 are provided. The outer surfaces of one end of the two groups of reset springs 621 are fixedly connected to the outer surface of the T-shaped locking block 62, and the other ends of the reset springs 621 are respectively fixedly connected to the inner surface of the convex plate 61; the mounting frame 5 is a "匚"-shaped plate-like structure as a whole, and the outer surfaces of both ends of the mounting frame 5 are respectively slidably connected to the inner side surfaces of the mounting side plates 6, and the outer surfaces of both sides of the mounting frame 5 are respectively provided with side grooves 50, and the lower end of the side groove 50 is provided with a slot 500, and the inner surfaces of the slot 500 and the side groove 50 are respectively movably connected to the outer surface of the T-shaped locking block 62;

[0048] When the T-lock block 62 is free from the restriction of the trapezoidal plug-in block 632, one end of the T-lock block 62 is quickly pulled outward by the elastic force of the reset spring 621. At this time, the T-lock block 62 retreats to the inner side of the convex plate 61, and at this time, the end of the T-lock block 62 close to the mounting frame 5 is pulled out of the interior of the slot 500, and then the T-lock block 62 slides on the inner wall of the side groove 50. In this way, the mounting frame 5 and the capacitor bank 4 quickly fall into the interior of the isolation box 7 under the action of gravity, thereby realizing the rapid isolation of the faulty capacitor bank 4 and avoiding the parallel influence on the electrical components on the side, further solving the problem that the existing device lacks an effective blocking mechanism, which easily causes the parallel damage of the entire low-voltage reactive power compensation device and is inconvenient to maintain.

[0049] Embodiment 5

[0050] See attached Figures 1-13 On the basis of the fourth embodiment, in order to realize the rapid fire extinguishing of the burning capacitor bank 4 that falls into the isolation box 7: an inert gas storage capsule 101 is arranged on the bottom surface of the inner cavity of the receiving tube 10, a flange seat 102 is fixedly connected to the outer surface of the upper end of the receiving tube 10, a sliding sleeve 104 is movably installed on the inner side of the flange seat 102, an outer edge is fixedly installed on the upper end of the sliding sleeve 104, and an arc-shaped spring piece 103 is fixedly connected to the lower surface of the outer edge. The arc-shaped spring piece 103 is provided with multiple groups and is equidistantly arranged in an array about the central axis of the sliding sleeve 104, and the other ends of the arc-shaped spring pieces 103 are respectively The sliding sleeve 104 is fixedly connected to the upper surface of the flange seat 102; a puncture assembly is arranged on the inner side of the sliding sleeve 104, and the puncture assembly includes a connecting plate 105 and a conical cover 106. The conical cover 106 is fixedly installed on the lower surface of the connecting plate 105, and the outer surface of the connecting plate 105 is fixedly connected to the inner ring surface of the sliding sleeve 104. An escape hole 108 is opened on the inner wall of the conical cover 106, and a circular through hole is opened on the central inner wall of the connecting plate 105. A ejector pin 107 is fixedly installed on the lower end of the conical cover 106, and the outer surface of the ejector pin 107 is movably connected to the upper surface of the inert gas storage capsule 101;

[0051] When a single group of capacitor banks 4 fails, the entire capacitor bank 4 falls into the isolation box 7. At this time, the mounting bracket 5 slides on the inner wall of the avoidance groove 30 and is located on both the front and rear sides of the isolation box 7. It should be noted that at this time, the mounting bracket 5 not only satisfies the assembly connection of the capacitor bank 4, but also can form a lock with the reset avoidance component, and can block both the front and rear sides of the isolation box 7 after the capacitor bank 4 completely falls, reducing the entry of oxygen inside the isolation box 7 to a certain extent and avoiding the spread of fire; the bottom end of the capacitor bank 4 contacts the surface of the isolation bottom plate 9. At this time, the top end of the sliding sleeve 104 is released from the bottom end of the capacitor bank 4 first. The sliding sleeve 104 slides inside the flange seat 102, and the arc-shaped elastic piece 103 generates elastic deformation with the downward pressure of the sliding sleeve 104. Subsequently, at this time, the connecting plate 105 and the conical cover 106 follow the downward movement of the sliding sleeve 104, and the ejector pin 107 travels downward for a certain distance to pierce the top end of the inert gas storage bladder 101, so as to realize the escape of the inert gas inside the inert gas storage bladder 101, and the inert gas rises from the escape hole 108 and the circular through hole to ensure that the inert gas fills the inner cavity of the isolation box 7. The released inert gas dilutes the oxygen concentration in the fire extinguishing area, thereby choking out the flame. When the oxygen concentration drops to a certain level, the flame will no longer be able to burn, so as to control the fire in time and avoid affecting the adjacent capacitor banks 4 and surrounding electrical components.

[0052] Embodiment Six

[0053] Refer to the appendix Figures 1-13 , on the basis of Embodiment Five, a working method of a combined low-voltage reactive power compensation device includes the following steps:

[0054] S1. Install the capacitor banks 4 separately at intervals, and install heat dissipation plates 8 between adjacent capacitor banks 4;

[0055] S2. When a capacitor bank 4 fails and its temperature exceeds a predetermined threshold, the fuse release component installed inside the mounting side plate 6 is activated by the high temperature and releases the restriction on the T-shaped lock block 62;

[0056] S3. After the fuse is released, the T-shaped lock block 62 quickly retracts under the action of the reset avoidance component, disengaging the restriction on the mounting bracket 5, causing the capacitor bank 4 to fall into the lower isolation box 7 under the action of gravity;

[0057] S4. When the capacitor bank 4 falls into the isolation box 7, its bottom contacts the isolation bottom plate 9 and triggers the piercing component, piercing the inert gas storage bladder 101 to release inert gas, filling the inner cavity of the fire extinguishing chamber isolation box 7, and controlling the fire in time.

[0058] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined low-voltage reactive power compensation device, comprising a low-voltage reactive power compensation device body (1) and a capacitor bank (4), characterized in that: An assembly frame (2) is installed inside the body (1) of the low-voltage reactive power compensation device. A fixed cross bar (3) is fixedly connected to the outer surface of the assembly frame (2). A high-temperature protection mechanism is arranged on the fixed cross bar (3). The high-temperature protection mechanism comprises a mounting frame (5) and an isolation box (7). An avoidance groove (30) is provided on the inner wall of the fixed cross bar (3). The capacitor bank (4) is fixedly installed on the inner side of the mounting frame (5). Heat sinks (8) are fixedly installed on both sides of the capacitor bank (4). The heat sinks (8) are fixedly installed on the inner side of the fixed cross bar (3). The isolation box (7) is fixedly installed directly below the mounting frame (5). An isolation bottom plate (9) is fixedly installed on the inner bottom surface of the isolation box (7). A receiving groove (90) is provided on the inner wall of the upper end of the isolation bottom plate (9), and a fire extinguishing mechanism is provided on the inner surface of the receiving groove (90), and the fire extinguishing mechanism includes a receiving tube (10). The outer surfaces of both sides of the mounting frame (5) are respectively provided with mounting side plates (6), and the mounting side plates (6) are fixedly mounted on the upper surface of the fixed cross bar (3). A reserved groove (60) is provided on the inner wall of the mounting side plate (6), and a T-shaped locking block (62) is slidably mounted on the inner wall of the reserved groove (60). The outer surfaces of both ends of the mounting frame (5) are respectively slidably connected to the inner side surface of the mounting side plate (6). The outer surfaces of both sides of the mounting frame (5) are respectively provided with side grooves (50), and the lower end of the side groove (50) is provided with a slot (500) through it. The outer surface of the upper end of the receiving tube (10) is fixedly connected to a flange seat (102), a sliding sleeve (104) is movably mounted on the inner side of the flange seat (102), an outer edge is fixedly mounted on the upper end of the sliding sleeve (104), and an arc-shaped spring piece (103) is fixedly mounted on the lower surface of the outer edge; the outer surface of the upper end of the receiving tube (10) is fixedly connected to the flange seat (102), a sliding sleeve (104) is movably mounted on the inner side of the flange seat (102), an outer edge is fixedly mounted on the upper end of the sliding sleeve (104), and an arc-shaped spring piece (103) is fixedly mounted on the lower surface of the outer edge; a piercing assembly is arranged on the inner side of the sliding sleeve (104), and the piercing assembly comprises a connecting plate (105) and a conical cover (106), and an escape hole (108) is opened on the inner wall of the conical cover (106).

2. A combined low-voltage reactive power compensation device according to claim 1, characterized in that: A convex plate (61) is fixedly connected to the outer surface of the mounting side plate (6); the T-shaped locking block (62) is in a "T"-shaped block structure as a whole; a trapezoidal groove (620) is provided on the inner wall of one end of the T-shaped locking block (62); a fuse release assembly is movably connected inside the trapezoidal groove (620).

3. A combined low-voltage reactive power compensation device according to claim 2, characterized in that: The fuse release component includes a guide plate (63) and a trapezoidal insert block (632). The outer surface of the trapezoidal insert block (632) is movably inserted into the inner surface of the trapezoidal groove (620). The guide plate (63) is fixedly installed on the outer surface of the inner side of the mounting side plate (6). One end of the guide plate (63) is fixedly connected to a fuse piece (631) and a shape memory alloy (633). There are two sets of the shape memory alloys (633), which are symmetrically distributed about the horizontal central axis of the fuse piece (631). The other ends of the fuse piece (631) and the shape memory alloy (633) are respectively fixedly connected to the outer surface of the trapezoidal insert block (632).

4. A combined low-voltage reactive power compensation device according to claim 3, characterized in that: One end of the T-shaped lock block (62) away from the trapezoidal insert block (632) is provided with a reset and avoidance component. The reset and avoidance component includes a reset spring (621). There are two sets of the reset springs (621). One ends of the two sets of reset springs (621) are fixedly connected to the outer surface of the T-shaped lock block (62), and the other ends of the reset springs (621) are respectively fixedly connected to the inner surface of the convex plate (61).

5. The combined low-voltage reactive power compensation device according to claim 1 is characterized in that: The mounting frame (5) is integrally in a "C"-shaped plate structure. The inner surfaces of the slot (500) and the side slot (50) are respectively movably connected to the outer surface of the T-shaped lock block (62).

6. A combined low-voltage reactive power compensation device according to claim 5, characterized in that: The upper outer surface of the mounting frame (5) is respectively movably installed with a first mounting seat (41) and a second mounting seat (42). Both ends of the first mounting seat (41) and the second mounting seat (42) are respectively penetrated and connected with fixing bolts (43). The first mounting seat (41) and the second mounting seat (42) are fixedly connected by the fixing bolts (43).

7. A combined low-voltage reactive power compensation device according to claim 1, characterized in that: The bottom surface of the inner cavity of the receiving cylinder (10) is provided with an inert gas storage bladder (101). There are multiple sets of arc-shaped elastic pieces (103), which are arranged in an equidistant array about the central axis of the sliding sleeve (104). The other ends of the arc-shaped elastic pieces (103) are respectively fixedly connected to the upper surface of the flange seat (102).

8. A combined low-voltage reactive power compensation device according to claim 7, characterized in that: The conical cover (106) is fixedly installed on the lower surface of the connecting plate (105). The outer surface of the connecting plate (105) is fixedly connected to the inner ring surface of the sliding sleeve (104). A circular through hole is opened on the central inner wall of the connecting plate (105). The lower end of the conical cover (106) is fixedly installed with a thimble (107). The outer surface of the thimble (107) is movably connected to the upper surface of the inert gas storage bladder (101).

9. A working method of a combined low-voltage reactive power compensation device, which is implemented based on a combined low-voltage reactive power compensation device according to any one of claims 1 to 8, characterized in that: The working method of this combined low-voltage reactive power compensation device includes the following steps: S1. Install the capacitor banks (4) separately at intervals, and install heat dissipation plates (8) between adjacent capacitor banks (4); S2. When a capacitor bank (4) fails and its temperature exceeds a predetermined threshold, the fuse release component installed inside the mounting side plate (6) is activated by the high temperature and releases the restriction on the T-shaped lock block (62); S3. After the fuse is released, the T-shaped lock block (62) quickly retracts under the action of the reset and avoidance component, disengaging from the restriction on the mounting frame (5), causing the capacitor bank (4) to fall into the lower isolation box (7) under the action of gravity; S4. When the capacitor bank (4) falls into the isolation box (7), its bottom contacts the isolation bottom plate (9) and triggers the puncture assembly, puncturing the inert gas storage capsule (101) to release the inert gas, which fills the inner cavity of the fire extinguishing cavity isolation box (7), thereby controlling the fire in a timely manner.

Images