A high-voltage end explosion-proof current-limiting harmonic eliminator based on a flow-sensitive material

Abstract

The application discloses a high-voltage end explosion-proof current-limiting harmonic eliminator based on a flow-sensitive material and belongs to the current-limiting harmonic eliminator field. The explosion-proof current-limiting harmonic eliminator comprises a base, support frames are symmetrically movably connected to the top end faces of the base, a protectable current-limiting harmonic elimination assembly is detachably connected between the top ends of the two support frames, a driving assembly is arranged below the protectable current-limiting harmonic elimination assembly and used for adjusting the spacing between the two support frames, and the driving assembly specifically comprises: a sliding groove, the sliding groove is arranged at the middle position of the top end face of the base, a fixed block matched with the sliding groove is fixedly connected to the middle position in the sliding groove, a support plate is fixedly connected to the top end face of the fixed block, support mechanisms are fixedly connected to the two sides of the top end face of the support plate and used for supporting the protectable current-limiting harmonic elimination assembly, and a driving shaft is arranged in the fixed block. The protectable current-limiting harmonic elimination assembly and the driving assembly can protect the wiring electrode and improve the mounting and dismounting speed of the current-limiting harmonic eliminator.

Description

Technical Field

[0001] This invention relates to a current limiting harmonic suppressor, specifically a high-voltage explosion-proof current limiting harmonic suppressor based on a flow-sensitive material. Background Technology

[0002] In neutral-point ungrounded systems and low-current grounded systems, when an unloaded busbar is closed, a single-phase arc grounding occurs, or the system load changes drastically, the nonlinear characteristic core of the electromagnetic voltage transformer may saturate, causing the winding excitation current to increase rapidly, sometimes reaching more than 100 times the rated excitation current. This can cause the high-voltage fuse of the voltage transformer to blow, and form a special single-phase or three-phase resonant circuit with the line and equipment's ground capacitance, resulting in continuous and high-amplitude overvoltages on the equipment in the circuit.

[0003] Overvoltage suppression measures for electromagnetic voltage transformers in neutral point non-effectively grounded systems: ① In terms of changing system parameters: 1) Use a PT with a high saturation point. A common solution is to use a PT with a high inflection point or a capacitive voltage transformer in a 10kV system; 2) Ground the neutral point through an arc suppression coil, which is equivalent to connecting an inductor with an inductance value much smaller than its excitation inductance in parallel with the PT, thereby completely breaking the parameter matching relationship and making ferroresonance less likely to occur; 3) 4PT connection method. The core is to add a zero-sequence voltage transformer to the primary neutral point of a single-phase PT. In this way, when a single-phase ground fault occurs, the zero-sequence voltage transformer bears the phase voltage, while the main PT is still under the positive-sequence symmetrical voltage. The transformer core will not enter the saturation region, thereby suppressing ferroresonance. ② To increase system damping, there are: 1) Connecting a damping resistor to the open delta winding of the PT is equivalent to connecting a resistor in parallel with the high-voltage winding of the PT. Once the system experiences ferroresonance, the effect of the inductance will be smaller, and the resonance energy will be released through the resistor. The smaller the resistor connected, the smaller the influence of the nonlinear inductance on the circuit, and the better it can suppress the occurrence of resonance; 2) Connecting a harmonic suppression resistor to the primary neutral point of the PT, referred to as primary harmonic suppression. By adding a nonlinear resistor harmonic suppression damping device between the neutral point of the primary winding of the PT and ground, the effect of suppressing resonance can be achieved.

[0004] Among them, current-limiting harmonic suppressors are the most widely used. However, the terminals of current-limiting harmonic suppressors are exposed and easily damaged during transportation or installation. Adding a protective device to the terminals would affect the subsequent installation speed. How to improve the installation and disassembly speed of current-limiting harmonic suppressors while protecting the terminals is a pressing problem. Therefore, those skilled in the art have provided a high-voltage explosion-proof current-limiting harmonic suppressor based on flow-sensitive materials to solve the problems mentioned in the background. Summary of the Invention

[0005] The purpose of this invention is to provide a high-voltage explosion-proof current limiting and harmonic suppressor based on flow-sensitive materials. By setting a protective current limiting and harmonic suppressor component and a drive component, the installation and disassembly speed of the current limiting and harmonic suppressor can be improved while protecting the wiring electrodes, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-voltage explosion-proof current limiting and harmonic suppressor based on flow-sensitive material includes a base, with support frames symmetrically and movably connected to both sides of the top surface of the base. A protective current limiting and harmonic suppressor component is detachably connected between the top ends of the two support frames, and a drive component is provided below the protective current limiting and harmonic suppressor component to adjust the distance between the two support frames.

[0008] By incorporating a protective current-limiting and harmonic-suppressing component and a drive component, the installation and removal speed of the current-limiting and harmonic-suppressing device can be improved while protecting the wiring electrodes.

[0009] As a further embodiment of the present invention: the driving assembly specifically includes: a slide groove, the slide groove being formed at the middle position of the top surface of the base, and a matching fixing block being fixedly connected to the middle position inside the slide groove; a support plate being fixedly connected to the top surface of the fixing block, and support mechanisms being fixedly connected to both sides of the top surface of the support plate to support the current limiting and harmonic elimination assembly; a driving shaft being provided inside the fixing block, and the driving shaft including an optical axis passing through the inside of the fixing block; threaded rods with opposite thread directions being fixedly connected to both ends of the optical axis, and one end of the threaded rod being embedded in the inner sidewall of the slide groove and movable; a slider being fixedly connected to the middle position of the bottom surface of the support frame, and the slider being movably connected inside the slide groove; one end of each of the two threaded rods passing through the two sliders and being threadedly connected to them; a knob being sleeved and fixed at the middle position of the outer side of the optical axis; a rotating groove for the knob to rotate being formed inside the base, support plate, and fixing block; and stabilizing limiting components being provided on both sides of the driving shaft.

[0010] In use, turning the knob drives the optical shaft of the drive shaft to rotate, and the threaded rods at both ends of the optical shaft rotate accordingly. Since the threads of the two threaded rods are in opposite directions, the two sliders move away from or closer to each other inside the slide groove, which in turn drives the two support frames to move away from or closer to each other. When they are close to each other, the two support frames will clamp the current limiting and harmonic elimination components. When they are far apart, the two support frames will loosen and protect the current limiting and harmonic elimination components, thus quickly completing the installation or disassembly.

[0011] As a further embodiment of the present invention: the stabilizing and limiting component specifically includes: limiting grooves formed on both sides of the slide groove; limiting seats fixedly connected to both sides of the bottom end face of the support plate, and the limiting seats fixed in the limiting grooves; limiting blocks fixedly connected to both sides of the bottom end face of the support frame, and the limiting blocks movably connected in the limiting grooves; and limiting rods fixedly connected inside the limiting seats, with both ends of the limiting rods passing through the corresponding limiting blocks on both sides and then being movable within the inner wall of the limiting grooves.

[0012] As the two support frames move away from or towards each other, the limiting block moves along the limiting rod in the limiting groove, ensuring the stability of the support frame movement and further restricting the direction of the two support frames.

[0013] As a further embodiment of the present invention: the support mechanism specifically includes: columns fixed on both sides of the top surface of the support plate, an arc-shaped plate fixedly connected to the top of the columns, and a wear-resistant pad fixedly connected to the inner side of the arc-shaped plate, the wear-resistant pad being in contact with the current-limiting and harmonic-eliminating component.

[0014] When installing the protective current limiting and harmonic suppression component, simply place it on the curved plate. As the two support frames approach each other, they respectively clamp the two ends of the component and push them together. During this process, the component will move slightly, and the wear-resistant pad reduces friction loss between the component and the support. When disassembling the component, as the two support frames move away from each other, the component separates from them. At this time, the curved plate supports the component to prevent it from falling and being damaged.

[0015] As a further embodiment of the present invention: the protective current limiting and harmonic elimination component specifically includes: a sleeve, the sleeve having symmetrical protective clips at both ends, the two protective clips being respectively clipped into clip holes opened at the top of the sides of two support frames, the sleeve having symmetrical threaded connections at both ends, and a wiring electrode being fixedly connected to the center of the outer side of the threaded seat, a conductive electrode being embedded in the inner side of the threaded seat, a quartz sand cylinder being fixedly connected inside the sleeve, and a partition being fixedly connected to the middle position inside the quartz sand cylinder, a fuse being provided on one side of the partition, and a harmonic elimination resistor being provided on the other side of the partition, a spring column being fixedly connected between the partition and one end of the fuse and one end of the harmonic elimination resistor, a conductive rod penetrating the partition being fixedly connected inside the spring column, and the two ends of the conductive rod being connected to the fuse and the harmonic elimination resistor respectively.

[0016] When installing the fuse and harmonic suppressor into the sleeve, simply pinch the terminal electrode and rotate it to unscrew the two threaded seats from both ends of the sleeve. Then, insert the fuse and harmonic suppressor into the quartz sand cylinder from both ends, and then screw the two threaded seats into the sleeve. During this process, as the threaded seats are pushed in, the spring column is compressed. When the threaded seats are unscrewed, the spring column releases its elastic potential energy to pop the fuse and harmonic suppressor out, which makes it easier to replace or maintain the fuse and harmonic suppressor.

[0017] As a further embodiment of the present invention: the protective clip specifically includes: a fixed ring fixed on the outer surface of the sleeve, a movable ring on one side of the fixed ring, and a protective sleeve fixedly connected to the side of the movable ring away from the fixed ring; multiple strip grooves are opened on the outer surface of the sleeve and the side of the fixed ring; a locking block is fixedly connected to the inner surface of the protective sleeve at the position corresponding to the strip groove, and the locking block is movably connected inside the strip groove and in interference contact with it; the outer diameter of the protective sleeve matches the inner diameter of the locking hole, and the protective sleeve can be inserted into the locking hole; a magnetic ejector is provided between the fixed ring and the movable ring.

[0018] Before the protective current-limiting and harmonic-suppressing component is fixed between the two support frames, the protective sleeve along with the movable ring can be pulled outwards. During this process, the locking block moves inside the strip groove until the protective sleeve surrounds the wiring electrode and protects it. When fixing the protective current-limiting and harmonic-suppressing component between the two support frames, the sleeve is placed on the arc plate. As the two support frames approach each other, the two protective sleeves are respectively inserted into the locking holes. After approaching each other to a certain distance, the two support frames abut against the two movable rings and push the two movable rings closer together until the movable rings contact the fixed ring. With the further compression of the two support frames, the sleeve and the protective locking pieces at both ends are firmly clamped. This means that the protective locking piece does not require additional disassembly work. Simply place the protective current-limiting and harmonic-suppressing component between the two support frames and clamp it in a step-by-step manner. This protective locking piece can protect the wiring electrode without affecting the installation and disassembly speed of the current-limiting and harmonic-suppressing device.

[0019] As a further embodiment of the present invention: the magnetic ejector specifically includes: a first strong magnet and a second strong magnet, the first strong magnet being embedded on the side of the fixed ring near the movable ring, the second strong magnet being embedded on the side of the movable ring near the fixed ring, and the second strong magnet being opposite to the first strong magnet.

[0020] Before the protective current limiting and harmonic elimination component is fixed between the two support frames, the repulsive magnetic force between the second strong magnet and the first strong magnet, due to their opposite orientation, accelerates the separation speed of the moving ring and the fixed ring.

[0021] As a further embodiment of the present invention: the inlet terminal of the fuse is connected to the external busbar through the wiring electrode and conductive electrode at one end of the sleeve, and the outlet terminal of the fuse is connected to the inlet terminal of the harmonic suppression resistor through a conductive rod; the outlet terminal of the harmonic suppression resistor is connected to the inlet terminal of the external voltage transformer through the wiring electrode and conductive electrode at the other end of the sleeve.

[0022] When ferroresonance is imminent, the excitation current between phases and ground or between phases of the primary winding of the voltage transformer increases. The suppression resistance of the explosion-proof current-limiting harmonic suppressor increases rapidly with the change in excitation current, immediately disrupting the conditions for ferroresonance and preventing its occurrence. When the system fault disappears, the suppression resistance of the explosion-proof current-limiting harmonic suppressor quickly returns to its initial state, without affecting the normal operation of the system.

[0023] As a further embodiment of the present invention: the two ends of the base are symmetrically fixedly connected with ear plates, and the ear plates are provided with threaded through holes.

[0024] When in use, the ear plate and the base are fixed at the place of use by inserting screws into the threaded through holes.

[0025] As a further aspect of the present invention, a weight-reducing groove is provided on the side of the support frame near the bottom.

[0026] The weight-reducing grooves can reduce the overall weight of the support frame without affecting its structural stability.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The protective current limiting and harmonic elimination components and drive components can improve the installation and disassembly speed of the current limiting and harmonic elimination device while protecting the wiring electrodes.

[0029] 2. With the set drive component, when in use, turning the knob drives the optical shaft of the drive shaft to rotate, and the threaded rods at both ends of the optical shaft rotate accordingly. Since the thread directions of the two threaded rods are opposite, the two sliders move away from or closer to each other inside the slide groove, which in turn drives the two support frames to move away from or closer to each other. When they are close to each other, the two support frames will clamp the current limiting and harmonic elimination component. When they are far apart, the two support frames will loosen the current limiting and harmonic elimination component, thus quickly completing the installation or disassembly.

[0030] 3. By setting up stabilizing limiting components, as the two support frames move away from or towards each other, the limiting block moves along the limiting rod in the limiting groove, ensuring the stability of the support frame movement and further restricting the direction of the two support frames.

[0031] 4. With the support mechanism in place, when installing the protective current limiting and harmonic elimination component, simply place it on the arc-shaped plate. As the two support frames approach each other, they respectively clamp the two ends of the protective current limiting and harmonic elimination component and push and tighten it. During this process, the protective current limiting and harmonic elimination component will move slightly, and the wear-resistant pad can reduce friction loss between the component and the support. When disassembling the protective current limiting and harmonic elimination component, as the two support frames move away from each other, the component separates from the support frames. At this time, the arc-shaped plate supports the component to prevent it from falling and being damaged.

[0032] 5. With the protection-protected current-limiting and harmonic-suppressing component, when installing the fuse and harmonic-suppressing resistor into the sleeve, simply pinch the terminal electrode and rotate it to unscrew the two threaded seats from both ends of the sleeve. Then, insert the fuse and harmonic-suppressing resistor into the quartz sand cylinder from both ends, and then screw the two threaded seats into the sleeve. During the process, as the threaded seats go deeper, the spring column is compressed. When the threaded seats are unscrewed, the spring column releases its elastic potential energy to pop out the fuse and harmonic-suppressing resistor, which facilitates the replacement or maintenance of the fuse and harmonic-suppressing resistor and further improves the installation and disassembly speed of the current-limiting and harmonic-suppressing device.

[0033] 6. With the protective clips in place, before the protectable current limiting and harmonic suppression component is fixed between the two support frames, the protective sleeve along with the movable ring can be pulled outwards. During this process, the clip moves inside the slot until the protective sleeve surrounds the wiring electrode for protection. When fixing the protectable current limiting and harmonic suppression component between the two support frames, the sleeve is placed on the arc plate. As the two support frames approach each other, the two protective sleeves are respectively inserted into the clip holes. After approaching each other to a certain distance, the two support frames abut against the two movable rings and push the two movable rings closer together until the movable rings contact the fixed ring. With the further compression of the two support frames, the sleeve and the protective clips at both ends are firmly clamped. This means that the protective clips do not require additional disassembly work. Simply place the protectable current limiting and harmonic suppression component between the two support frames and clamp it in a step-by-step manner. This protective clip can protect the wiring electrode without affecting the installation and disassembly speed of the current limiting and harmonic suppression device.

[0034] 7. With the magnetic ejector, before the protective current limiting and harmonic elimination component is fixed between the two support frames, the repulsive magnetic force between the second strong magnet and the first strong magnet, due to their opposite orientation, accelerates the separation speed of the moving ring and the fixed ring.

[0035] 8. This application is the first to connect a harmonic suppression resistor in series at the high-voltage end. The current flowing through it is not the vector sum of the three-phase currents, and the primary excitation current is larger, which allows the harmonic suppression resistor to quickly enter the nonlinear region, thus more quickly and effectively preventing the occurrence of ferroresonance and greatly shortening the harmonic suppression time. Each phase is equipped with a current-limiting harmonic suppressor, which can solve both the phase-to-ground overvoltage problem of ferroresonance and the phase-to-phase overvoltage inrush current problem. The fuse and harmonic suppression resistor are combined into one, which can replace the original PT high-voltage fuse on the one hand, and prevent the current-limiting harmonic suppressor from self-exploding due to long-term current carrying or frequent operation while preventing the occurrence of ferroresonance. The harmonic suppression resistor uses a positive temperature characteristic current-limiting material. When ferroresonance occurs, the resistance value of the harmonic suppression resistor surges, destroying the conditions for resonance. After the system fault disappears, the harmonic suppression resistor quickly returns to its initial state without affecting the operating characteristics of the voltage transformer. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive materials.

[0037] Figure 2 This is a combined view of the support plate and the fixing block in a high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive material;

[0038] Figure 3 This is a combined view of the support frame and slider in a high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive materials;

[0039] Figure 4 An internal view of a chute in a high-voltage explosion-proof current-limiting harmonic suppressor based on flow-sensitive material;

[0040] Figure 5 This is a schematic diagram of the protective clip in a high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive materials.

[0041] Figure 6 An internal view of the sleeve in a high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive material;

[0042] Figure 7 This is a schematic diagram of the support mechanism in a high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive materials.

[0043] Figure 8 This is a circuit diagram showing the connection between the fuse and the harmonic suppression resistor in a high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive materials.

[0044] In the diagram: 1. Base; 2. Limiting groove; 3. Slide groove; 4. Support frame; 5. Support plate; 6. Limiting seat; 7. Fixing block; 8. Limiting rod; 9. Drive shaft; 10. Knob; 11. Limiting block; 12. Slider; 13. Rotating groove; 14. Sleeve; 15. Fixing ring; 16. Moving ring; 17. First strong magnet; 18. Second strong magnet; 19. Protective sleeve; 20. Strip groove; 21. Locking block; 22. Threaded seat; 23. Wiring electrode; 24. Conductive electrode; 25. Quartz sand cylinder; 26. Partition plate; 27. Fuse; 28. Harmonic suppressor; 29. ​​Spring column; 30. Conductive rod; 31. Ear plate; 32. Locking hole; 33. Column; 34. Arc plate; 35. Wear-resistant pad. Detailed Implementation

[0045] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0046] Please see Figures 1-8 In this embodiment of the invention, a high-voltage explosion-proof current-limiting and harmonic-suppressing device based on a flow-sensitive material includes a base 1. Support frames 4 are symmetrically and movably connected to both sides of the top surface of the base 1. A protective current-limiting and harmonic-suppressing component is detachably connected between the top ends of the two support frames 4. A driving component is provided below the protective current-limiting and harmonic-suppressing component to adjust the distance between the two support frames 4. The protective current-limiting and harmonic-suppressing component and the driving component can improve the installation and removal speed of the current-limiting and harmonic-suppressing device while protecting the wiring electrode 23.

[0047] In this embodiment, the drive assembly specifically includes: a slide 3, which is located at the middle of the top surface of the base 1, and a matching fixing block 7 is fixedly connected to the middle of the slide 3. A support plate 5 is fixedly connected to the top surface of the fixing block 7, and support mechanisms are fixedly connected to both sides of the top surface of the support plate 5 to support the current limiting and harmonic elimination assembly. A drive shaft 9 is provided inside the fixing block 7, and the drive shaft 9 includes an optical axis that passes through the inside of the fixing block 7. Threaded rods with opposite thread directions are fixedly connected to both ends of the optical axis, and one end of the threaded rod is embedded in the inner wall of the slide 3 and can move. A slider 12 is fixedly connected to the middle of the bottom surface of the support frame 4, and the slider 12 is movably connected inside the slide 3. One end of each of the two threaded rods passes through the two sliders 12 and is threadedly connected to them. A knob 10 is sleeved and fixed at the middle of the outer surface of the optical axis. A rotating groove 13 for the knob 10 to rotate is provided inside the base 1, support plate 5, and fixing block 7. Stabilizing and limiting components are provided on both sides of the drive shaft 9. In use, turning the knob 10 drives the optical shaft of the drive shaft 9 to rotate, and the threaded rods at both ends of the optical shaft rotate accordingly. Since the thread directions of the two threaded rods are opposite, the two sliders 12 move away from or closer to each other inside the slide groove 3, thereby driving the two support frames 4 to move away from or closer to each other. When they are close to each other, the two support frames 4 clamp the current limiting and harmonic elimination component. When they are far apart, the two support frames 4 release the current limiting and harmonic elimination component, thereby quickly completing the installation or disassembly.

[0048] In this embodiment, the stabilizing and limiting component specifically includes: limiting grooves 2 formed on both sides of the slide groove 3; limiting seats 6 fixedly connected to both sides of the bottom end face of the support plate 5, and the limiting seats 6 fixed in the limiting grooves 2; limiting blocks 11 fixedly connected to both sides of the bottom end face of the support frame 4, and the limiting blocks 11 movably connected in the limiting grooves 2; and limiting rods 8 fixedly connected inside the limiting seats 6, with both ends of the limiting rods 8 passing through the corresponding limiting blocks 11 on both sides and then being movable within the inner wall of the limiting grooves 2. As the two support frames 4 move away from or towards each other, the limiting blocks 11 move along the limiting rods 8 within the limiting grooves 2, ensuring the stability of the movement of the support frames 4 and further restricting the direction of the two support frames 4.

[0049] In this embodiment, the support mechanism specifically includes: columns 33 fixed on both sides of the top surface of the support plate 5; an arc-shaped plate 34 is fixedly connected to the top of the columns 33; and a wear-resistant pad 35 is fixedly connected to the inner side of the arc-shaped plate 34. The wear-resistant pad 35 contacts the protective current-limiting and harmonic-eliminating component. When installing the protective current-limiting and harmonic-eliminating component, it is simply placed on the arc-shaped plate 34. As the two support frames 4 approach each other, they respectively clamp the two ends of the protective current-limiting and harmonic-eliminating component and push and clamp it. During this process, the protective current-limiting and harmonic-eliminating component will move slightly, and the wear-resistant pad 35 can reduce the friction loss between it and the protective current-limiting and harmonic-eliminating component. When disassembling the protective current-limiting and harmonic-eliminating component, as the two support frames 4 move away from each other, the protective current-limiting and harmonic-eliminating component separates from the two support frames 4. At this time, the arc-shaped plate 34 supports the protective current-limiting and harmonic-eliminating component to prevent it from falling and being damaged.

[0050] In this embodiment, the protective current limiting and harmonic elimination component specifically includes: a sleeve 14, with protective clips symmetrically provided at both ends of the sleeve 14. The two protective clips are respectively locked in the clip holes 32 opened at the top of the side of the two support frames 4. The sleeve 14 has threaded seats 22 symmetrically threaded at both ends inside, and a wiring electrode 23 is fixedly connected to the center of the outer side of the threaded seat 22. A conductive electrode 24 is embedded in the inner side of the threaded seat 22. A quartz sand cylinder 25 is fixedly connected inside the sleeve 14, and a partition 26 is fixedly connected to the middle position inside the quartz sand cylinder 25. A fuse 27 is provided on one side of the partition 26, and a harmonic elimination resistor 28 is provided on the other side of the partition 26. A spring post 29 is fixedly connected between the partition 26 and one end of the fuse 27 and one end of the harmonic elimination resistor 28. A conductive rod 30 penetrating the partition 26 is fixedly connected inside the spring post 29, and the two ends of the conductive rod 30 are respectively connected to the fuse 27 and the harmonic elimination resistor 28. When installing the fuse 27 and the harmonic suppressor 28 into the sleeve 14, simply pinch the terminal electrode 23 and rotate it to unscrew the two threaded seats 22 from both ends of the sleeve 14. Then, insert the fuse 27 and the harmonic suppressor 28 into the quartz sand cylinder 25 from both ends, and then screw the two threaded seats 22 into the sleeve 14. During the process, as the threaded seats 22 are pushed deeper, the spring column 29 is compressed. When the threaded seats 22 are unscrewed, the spring column 29 releases its elastic potential energy to pop out the fuse 27 and the harmonic suppressor 28, which makes it easier to replace or maintain the fuse 27 and the harmonic suppressor 28.

[0051] In this embodiment, the protective clip specifically includes: a fixed ring 15 fixed on the outer surface of the sleeve 14, a movable ring 16 on one side of the fixed ring 15, and a protective sleeve 19 fixedly connected to the side of the movable ring 16 away from the fixed ring 15. Multiple strip grooves 20 are opened on the outer surface of the sleeve 14 and the side of the fixed ring 15. A locking block 21 is fixedly connected to the inner surface of the protective sleeve 19 at the position corresponding to the strip groove 20. The locking block 21 is movably connected inside the strip groove 20 and makes interference contact with it. The outer diameter of the protective sleeve 19 matches the inner diameter of the locking hole 32, and the protective sleeve 19 can be inserted into the locking hole 32. A magnetic ejector is provided between the fixed ring 15 and the movable ring 16. Before the protective current limiting and harmonic suppression component is fixed between the two support frames 4, the protective sleeve 19 along with the movable ring 16 can be pulled outward. During this process, the locking block 21 moves inside the strip groove 20 until the protective sleeve 19 surrounds the wiring electrode 23 to protect it. When the protective current limiting and harmonic suppression component is fixed between the two support frames 4, the sleeve 14 is placed on the arc plate 34. As the two support frames 4 approach each other, the two protective sleeves 19 are respectively inserted into the locking holes 32. After approaching each other by a certain distance, the two support frames 4 abut against the two movable rings 16 and push the two movable rings 16 closer to each other until the movable rings 16 contact the fixed ring 15. As the two support frames 4 further compress, the sleeve 14 and the protective locking pieces at both ends are firmly clamped. This means that the protective locking piece does not require additional disassembly work. The protective current limiting and harmonic suppression component can be placed between the two support frames 4 and clamped and fixed step by step. This protective locking piece can protect the wiring electrode 23 without affecting the installation and disassembly speed of the current limiting and harmonic suppression device.

[0052] In this embodiment, the magnetic ejector specifically includes a first strong magnet 17 and a second strong magnet 18. The first strong magnet 17 is embedded on the side of the fixed ring 15 near the movable ring 16, and the second strong magnet 18 is embedded on the side of the movable ring 16 near the fixed ring 15, with the second strong magnet 18 and the first strong magnet 17 facing each other in opposite directions. Before the current-limiting and harmonic-eliminating component is fixed between the two support frames 4, the repulsive magnetic force between the second strong magnet 18 and the first strong magnet 17, due to their opposite orientation, accelerates the separation speed of the movable ring 16 and the fixed ring 15.

[0053] In this embodiment: the inlet terminal of fuse 27 is connected to the external busbar through the wiring electrode 23 and conductive electrode 24 at one end of sleeve 14, and the outlet terminal of fuse 27 is connected to the inlet terminal of harmonic suppression resistor 28 through conductive rod 30; the outlet terminal of harmonic suppression resistor 28 is connected to the inlet terminal of external voltage transformer through the wiring electrode 23 and conductive electrode 24 at the other end of sleeve 14. When ferroresonance is about to occur, the excitation current between phase and ground or between phases of the primary winding of the voltage transformer increases. The harmonic suppression resistor 28 of the explosion-proof current-limiting harmonic suppressor increases rapidly with the change of excitation current, immediately destroying the conditions for ferroresonance and preventing its occurrence. When the system fault disappears, the harmonic suppression resistor 28 of the explosion-proof current-limiting harmonic suppressor quickly returns to its initial state, without affecting the normal operation of the system.

[0054] In this embodiment, ear plates 31 are symmetrically fixedly connected to both ends of the base 1, and threaded through holes are provided inside the ear plates 31. In use, the ear plates 31 and the base 1 are fixed to the location of use by inserting screws into the threaded through holes.

[0055] In this embodiment, a weight-reducing groove is provided on the side of the support frame 4 near the bottom. The weight-reducing groove can reduce the overall weight of the support frame 4 without affecting its structural stability.

[0056] In this embodiment, the harmonic suppression resistor 28 is made of a flow-sensitive material.

[0057] In this embodiment, the harmonic suppression resistor 28 is made of a positive temperature characteristic current-limiting material. This application utilizes the current-limiting characteristics of the current-sensitive material to disrupt the conditions for ferroresonance when it occurs, and quickly restores the system to its initial state after the system fault disappears, without affecting the characteristics of the voltage transformer.

[0058] The working principle of this invention is as follows: Before the protective current-limiting and harmonic-eliminating component is fixed between the two support frames 4, the protective sleeve 19 along with the movable ring 16 can be pulled outward. During this process, the locking block 21 moves along with it inside the strip groove 20 until the protective sleeve 19 surrounds the wiring electrode 23 to protect it and prevent the wiring electrode 23 from being directly exposed and damaged. In addition, since the second strong magnet 18 and the first strong magnet 17 are set in opposite directions, their repulsive magnetic force accelerates the separation speed of the movable ring 16 and the fixed ring 15. In use, the sleeve 14 of the protective current-limiting and harmonic-eliminating component is placed on the arc plate 34, and then the knob 10 is turned clockwise to drive the optical axis of the drive shaft 9 to rotate. The threaded rods at both ends of the optical axis rotate accordingly. Since the thread directions of the two threaded rods are opposite, the two sliders 12 move closer to each other inside the slide groove 3, thereby driving the two support frames 4 to move closer to each other.

[0059] As the two support frames 4 approach each other, the two protective sleeves 19 are respectively inserted into the locking holes 32. After approaching each other by a certain distance, the two support frames 4 respectively abut against the two movable rings 16 and push the two movable rings 16 closer to each other until the movable rings 16 contact the fixed rings 15. As the two support frames 4 further compress, the sleeves 14 and the protective clips at both ends are firmly clamped. This makes it possible to eliminate the need for additional disassembly of the protective clips. Simply place the protective current limiting and harmonic elimination component between the two support frames 4 and clamp and fix it step by step.

[0060] After securing the protective current-limiting harmonic suppression component, connect it to the external busbar and voltage transformer for use. During operation, the quartz sand cylinder 25 absorbs the heat generated by the fuse 27 and the harmonic suppression resistor 28 and quickly dissipates the heat into the air. When ferroresonance is imminent, the excitation current between phases and ground or between phases of the primary winding of the voltage transformer increases. The harmonic suppression resistor 28 of the explosion-proof current-limiting harmonic suppression device rapidly increases with the change in excitation current, immediately disrupting the conditions for ferroresonance and preventing its occurrence. When the system fault disappears, the harmonic suppression resistor 28 of the explosion-proof current-limiting harmonic suppression device quickly returns to its initial state, without affecting the normal operation of the system. It should be noted that under normal operating conditions, each phase harmonic suppression resistor 28 exhibits low resistance, which does not affect the characteristic voltage error or phase error of the voltage transformer. When a system fault occurs, such as a single-phase ground fault or capacitor switching, the excitation current between phases and ground or between phases of the primary winding of the voltage transformer increases. The resistance of one or more phases of the harmonic suppression resistor 28 connected in series at the high-voltage end surges, suppressing the current and causing the voltage transformer to become unsaturated, thus disrupting the resonance condition and achieving the harmonic suppression effect. When the system fault disappears, the resistance of the harmonic suppression resistor 28 quickly returns to its initial state, without affecting the normal operation of the voltage transformer. When the system capacitive current is large, during a system fault, if the excitation current flowing through the primary winding of the voltage transformer exceeds the capacity of the harmonic suppression resistor 28, the fuse 27 quickly blows, protecting the harmonic suppression resistor 28 and the voltage transformer.

[0061] After the fuse 27 blows or the harmonic suppressor 28 is damaged, the knob 10 is turned counterclockwise to move the two support brackets 4 away from each other, thus protecting the current limiting and harmonic suppressor assembly from detaching from the two support brackets 4. The current limiting and harmonic suppressor assembly is removed, and the wiring electrode 23 is pinched and rotated to unscrew the two threaded seats 22 from both ends of the sleeve 14. At this time, the spring column 29 releases its elastic potential energy to pop out the fuse 27 and the harmonic suppressor 28, which facilitates the replacement or maintenance of the fuse 27 and the harmonic suppressor 28, and further improves the installation and removal speed of the current limiting and harmonic suppressor. Subsequently, the replaced or maintained fuse 27 and harmonic suppressor 28 are inserted into the quartz sand cylinder 25 from both ends, and then the two threaded seats 22 are screwed into the sleeve 14. During the process, as the threaded seats 22 are inserted deeper, the spring column 29 is compressed.

[0062] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0063] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-voltage explosion-proof current-limiting harmonic suppressor based on flow-sensitive material, characterized in that, Includes a base (1), on both sides of the top surface of the base (1) are symmetrically and movably connected to support frames (4), and a protective current limiting and harmonic elimination component is detachably connected between the tops of the two support frames (4), and a drive component is provided below the protective current limiting and harmonic elimination component to adjust the distance between the two support frames (4). The protective current limiting and harmonic elimination component specifically includes: a sleeve (14), with protective clips symmetrically provided at both ends of the sleeve (14), the two protective clips respectively being clipped into the clip holes (32) opened at the top of the side of the two support frames (4), the sleeve (14) having threaded seats (22) symmetrically threaded at both ends inside, and a wiring electrode (23) fixedly connected to the center of the outer side of the threaded seat (22), a conductive electrode (24) embedded in the inner side of the threaded seat (22), and a quartz sand cylinder (25) fixedly connected inside the sleeve (14). Furthermore, a partition (26) is fixedly connected to the middle position inside the quartz sand cylinder (25). A fuse (27) is provided on one side of the partition (26), and a harmonic suppression resistor (28) is provided on the other side of the partition (26). A spring column (29) is fixedly connected between the partition (26) and one end of the fuse (27) and one end of the harmonic suppression resistor (28). A conductive rod (30) that penetrates the partition (26) is fixedly connected inside the spring column (29), and the two ends of the conductive rod (30) are connected to the fuse (27) and the harmonic suppression resistor (28) respectively. The protective clip specifically includes: a fixed ring (15) fixed on the outer side of the sleeve (14), a movable ring (16) on one side of the fixed ring (15), and a protective sleeve (19) fixedly connected to the side of the movable ring (16) away from the fixed ring (15). Multiple strip grooves (20) are opened on the outer side of the sleeve (14) and the side of the fixed ring (15). A locking block (21) is fixedly connected to the inner side of the protective sleeve (19) at the position corresponding to the strip groove (20). The locking block (21) is movably connected inside the strip groove (20) and in interference contact with it. The outer diameter of the protective sleeve (19) matches the inner diameter of the locking hole (32), and the protective sleeve (19) can be inserted into the locking hole (32). A magnetic ejector is provided between the fixed ring (15) and the movable ring (16).

2. The high-voltage explosion-proof current limiting harmonic suppressor based on flow-sensitive material according to claim 1, characterized in that, The drive assembly specifically includes: a slide (3), which is located at the middle of the top surface of the base (1), and a matching fixing block (7) is fixedly connected to the middle of the slide (3). A support plate (5) is fixedly connected to the top surface of the fixing block (7), and support mechanisms are fixedly connected to both sides of the top surface of the support plate (5) to support the current limiting and harmonic elimination assembly. A drive shaft (9) is provided inside the fixing block (7), and the drive shaft (9) includes an optical axis that passes through the inside of the fixing block (7). The two ends of the optical axis are respectively fixedly connected to threaded directions. The opposite threaded rod, with one end of the threaded rod embedded in the inner wall of the slide groove (3) and movable, has a slider (12) fixedly connected to the middle position of the bottom end face of the support frame (4), and the slider (12) is movably connected inside the slide groove (3). One end of each of the two threaded rods passes through the two sliders (12) and is threadedly connected to them. A knob (10) is fixedly sleeved at the middle position of the outer side of the optical axis. The base (1), support plate (5), and fixing block (7) are all provided with a rotating groove (13) for the knob (10) to rotate. Both sides of the drive shaft (9) are provided with stabilizing and limiting components.

3. The high-voltage end explosion-proof current limiting harmonic suppressor based on flow-sensitive material according to claim 2, characterized in that, The stabilizing limiting component specifically includes: limiting grooves (2) opened on both sides of the slide groove (3); limiting seats (6) are fixedly connected to both sides of the bottom end face of the support plate (5), and the limiting seats (6) are fixed in the limiting grooves (2); limiting blocks (11) are fixedly connected to both sides of the bottom end face of the support frame (4), and the limiting blocks (11) are movably connected in the limiting grooves (2); limiting rods (8) are fixedly connected inside the limiting seats (6), and the two ends of the limiting rods (8) pass through the corresponding limiting blocks (11) on both sides and are embedded in the inner wall of the limiting grooves (2) and can move.

4. A high-voltage explosion-proof current-limiting harmonic suppressor based on a flow-sensitive material according to claim 2, characterized in that, The support mechanism specifically includes: columns (33) fixed on both sides of the top surface of the support plate (5), an arc plate (34) fixedly connected to the top of the column (33), and a wear-resistant pad (35) fixedly connected to the inner side of the arc plate (34), and the wear-resistant pad (35) is in contact with the current limiting and harmonic elimination component.

5. A high-voltage explosion-proof current-limiting harmonic suppressor based on a flow-sensitive material according to claim 1, characterized in that, The magnetic ejector specifically includes a first strong magnet (17) and a second strong magnet (18). The first strong magnet (17) is embedded on the side of the fixed ring (15) near the movable ring (16), and the second strong magnet (18) is embedded on the side of the movable ring (16) near the fixed ring (15). The second strong magnet (18) and the first strong magnet (17) are opposite to each other.

6. A high-voltage explosion-proof current-limiting harmonic suppressor based on a flow-sensitive material according to claim 5, characterized in that, The inlet of the fuse (27) is connected to the external busbar through the wiring electrode (23) and conductive electrode (24) at one end of the sleeve (14), and the outlet of the fuse (27) is connected to the inlet of the harmonic suppression resistor (28) through the conductive rod (30); the outlet of the harmonic suppression resistor (28) is connected to the inlet of the external voltage transformer through the wiring electrode (23) and conductive electrode (24) at the other end of the sleeve (14).

7. A high-voltage explosion-proof current-limiting harmonic suppressor based on a flow-sensitive material according to claim 1, characterized in that, The base (1) is symmetrically fixedly connected to ear plates (31) at both ends, and the ear plates (31) are provided with threaded through holes.

8. A high-voltage explosion-proof current-limiting harmonic suppressor based on a flow-sensitive material according to claim 1, characterized in that, The support frame (4) has a weight-reducing groove on its side near the bottom.

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