Arc extinguishing and harmonic elimination device

Abstract

The invention discloses an arc extinguishing and harmonic elimination device, which relates to the technical field of circuit overvoltage protection equipment. A detection module, a control module, and a fault processing module are respectively arranged in independent chambers in a device shell for installation, and each module is surrounded by a shielding net. The shielding net is used to reduce electromagnetic interference outside the module. During the operation of the device, the influence of the magnetic field generated by the arc extinguishing coil on the fault processing module on the voltage transformer on the detection module is reduced, the anti-electromagnetic interference performance of each module is improved, and the accuracy of the detection voltage of the detection module is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of circuit overvoltage protection equipment, and in particular to an arc extinguishing and harmonic elimination device. Background Art

[0002] The arc extinguishing and harmonic elimination device uses a voltage transformer to monitor the grid voltage signal and outputs the acquired voltage signal to the control unit of the device. The control unit makes a judgment based on the changes between the three-phase voltages. When an overvoltage, ferromagnetic resonance or other faults occur, the inductance value on the arc extinguishing coil is adjusted so that the inductance current generated by the arc extinguishing coil compensates for the grounding capacitance current, thereby extinguishing the arc; when a ferromagnetic resonance fault occurs, the open delta winding of the voltage transformer on the busbar is short-circuited or connected to a high-power resistor to eliminate the resonance, thereby protecting the grid equipment from damage caused by the resonant overvoltage;

[0003] For the microcomputer detuning and arc extinguishing device, due to its small size and compact internal components, the arc extinguishing coil will generate a magnetic field during operation. The voltage transformer is a device that works based on the principle of electromagnetic induction. When the two are close to each other, the magnetic field generated by the arc extinguishing coil may interfere with the normal operation of the voltage transformer to a certain extent, which may cause slight distortion in the secondary side output voltage of the voltage transformer and affect the accurate measurement of the system voltage. Summary of the invention

[0004] The present invention aims to overcome the problem that in the prior art, the voltage transformer and arc suppression coil in the device are both installed in the device housing without isolation, and the magnetic field generated by the arc suppression coil during operation will interfere with the voltage transformer, thereby affecting the accurate measurement of the system voltage. The purpose is to provide an arc suppression and detuning device.

[0005] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0006] An arc extinguishing and harmonic elimination device comprises: a device shell, a detection module, a control module, and a fault processing module. The interior of the device shell is divided into three independent chambers, an isolation plate is arranged between each chamber, a voltage transformer is arranged in the detection module, the detection module detects voltage and outputs voltage measurement data to the control module, the control module outputs a control signal to the fault processing module, an arc extinguishing coil is arranged on the fault processing module, shielding nets are respectively arranged in the three independent chambers inside the device shell, the shielding nets are grounded, the detection module, the control module, and the fault processing module are respectively installed in the shielding nets in the three independent chambers, a filtering circuit is arranged in the detection module, and the voltage signal detected by the voltage transformer is filtered by the filtering circuit and then transmitted to the control module.

[0007] Furthermore, mounting frames are respectively provided in the three independent chambers inside the device shell, and an annular slide rail is provided on the mounting frame, a movable rack is slidably installed inside the annular slide rail, a winding rod is rotatably installed inside the mounting frame, the shielding net is wound on the winding rod, one end of the shielding net is fixedly connected to the movable seat, the movable seat is slidably installed on the annular slide rail, the movable seat is provided with a latch tooth, the latch tooth is inserted into the tooth groove on the movable rack, a supporting frame is provided on the annular slide rail, a driving wheel is rotatably installed on the supporting frame, the driving wheel contacts the inner side surface of the device shell, a driven wheel is rotatably installed on the annular slide rail, the driven wheel meshes with the movable rack, and the driving wheel drives the driven wheel to rotate through an axis and a gear connection.

[0008] Furthermore, a torsion spring is installed on the rolling rod, and the torsion spring applies a torsion force to rotate the rolling rod.

[0009] Furthermore, the annular slide rail includes an upper half-ring slide rail and a lower half-ring slide rail, and the movable rack is also divided into two sections corresponding to the upper half-ring slide rail and the lower half-ring slide rail, and is respectively slidably located in the upper half-ring slide rail and the lower half-ring slide rail.

[0010] Furthermore, positioning grooves are respectively provided on both sides of the support frame and on both sides of the mounting frame, and a top column is slidably installed in the positioning groove, one end of the top column extends out of the positioning groove and is connected to a pressure plate, a supporting spring is provided between the mounting frame and the pressure plate, and the supporting spring applies a force on the pressure plate in a direction away from the positioning groove, and a chamfer is provided on the other end of the top column, a first docking rod is slidably installed on the side of the upper semi-ring slide rail, and a second docking rod is provided on the side of the lower semi-ring slide rail, the end head of the first docking rod is inserted into the positioning groove on the support frame, the end head of the first docking rod can contact the chamfer on the top column, the end head of the second docking rod is inserted into the positioning groove on the mounting frame, the second docking rod can contact the chamfer on the top column in the positioning groove on the mounting frame, and the first docking rod can be inserted into the second docking rod.

[0011] Furthermore, a buffer column is slidably installed on the support frame, a buffer box is fixed on the buffer column, a buffer spring is provided between the buffer box and the support frame, a driving shaft is rotatably installed on the buffer box, the driving wheel is installed on the driving shaft, a first bevel gear is installed on the driving shaft, a second bevel gear is rotatably installed on the buffer box, the first bevel gear meshes with the second bevel gear, a transmission shaft is rotatably installed on the support frame, the lower end of the transmission shaft meshes with the driven wheel through a gear connection, the second bevel gear is connected to the transmission shaft through a keyway, and the second bevel gear can slide along the axial direction of the transmission shaft.

[0012] Furthermore, a worm wheel is coaxially arranged on the driven wheel, and the transmission shaft and the worm wheel form a worm gear mechanism.

[0013] Furthermore, a first foot rod and a second foot rod are hingedly installed at the bottom of the mounting frame, a tension spring is provided between the lower end of the first foot rod and the lower end of the second foot rod, a first connecting rod is hingedly installed at the middle part of the first foot rod, and a second connecting rod is hingedly installed at the middle part of the second foot rod. The first connecting rod and the second connecting rod are hinged on a floating seat, a floating column is fixedly installed on the floating seat, the upper end of the floating column slides through the mounting frame, and a circuit element mounting plate is fixed to the upper end of the floating column.

[0014] Furthermore, a pad is provided at the lower part of the mounting frame, a buffer groove is provided on the pad, and casters are respectively installed at the lower ends of the first foot rod and the second foot rod, and the casters are located in the buffer groove.

[0015] Furthermore, a sliding roller is installed on the annular slide rail, and the sliding roller contacts the side of the moving rack.

[0016] The beneficial effects of the present invention are:

[0017] The detection module, control module, and fault processing module are installed in separate chambers in the device housing, and each module is surrounded by a shielding net. The shielding net is used to reduce the electromagnetic interference outside the module. During the operation of the device, the influence of the magnetic field generated by the arc suppression coil on the fault processing module on the voltage transformer on the detection module is reduced, the anti-electromagnetic interference performance of each module is improved, and the accuracy of the detection voltage of the detection module is improved;

[0018] By using the rolling rod, the annular slide rail and the moving seat, when the mounting frame is inserted into the chamber in the device housing, the shielding net is driven to move along the annular slide rail by using the moving seat, and the laying of the shielding net is completed during the process of inserting the mounting frame into the chamber, which is convenient for the installation and maintenance operations of each module on the mounting frame and can ensure the laying of the shielding net;

[0019] The upper part of the mounting frame uses a buffer spring to support the buffer box, and the lower part of the mounting frame is supported by a first foot rod and a second foot rod. A tension spring is connected between the first foot rod and the second foot rod, thereby supporting the mounting frame. When the device is hit in the vertical direction, the inertial displacement of the mounting frame in the vertical direction can be buffered, thereby improving the shock absorption performance of the mounting frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 A schematic diagram of the mounting bracket of the present invention being inserted into a device housing;

[0022] Figure 3 It is a schematic diagram of the installation of the annular slide rail of the present invention;

[0023] Figure 4It is a schematic diagram of the meshing of the driven wheel and the movable rack of the present invention;

[0024] Figure 5 It is a schematic diagram of the installation of the rolling rod of the present invention;

[0025] Figure 6 It is a schematic diagram of the installation of the floating column and the floating seat of the present invention;

[0026] In the figure: 1, device housing; 2, detection module; 3, control module; 4, fault handling module; 5, shielding net; 6, isolation plate; 12, mounting frame; 13, annular slide rail; 14, moving rack; 15, rolling rod; 16, moving seat; 17, latching gear; 18, support frame; 21, driving wheel; 22, driven wheel; 23, torsion spring; 31, upper half ring slide rail; 32, lower half ring slide rail; 41, positioning groove; 42, top column; 43, support spring; 44, pressure plate; 45, the first A pair of docking rods; 46, a second docking rod; 51, a buffer column; 52, a buffer box; 53, a buffer spring; 54, a drive shaft; 55, a first bevel gear; 56, a second bevel gear; 57, a transmission shaft; 58, a worm gear; 60, a sliding roller; 61, a first foot rod; 62, a second foot rod; 63, a tension spring; 64, a first connecting rod; 65, a second connecting rod; 66, a floating seat; 67, a floating column; 68, a circuit element mounting plate; 69, a pad; 70, a buffer groove; 71, a caster. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0028] Embodiment 1:

[0029] like Figure 1 As shown, an arc extinguishing and harmonic elimination device comprises: a device housing 1, a detection module 2, a control module 3, and a fault processing module 4. The interior of the device housing 1 is divided into three independent chambers, an isolation plate 6 is arranged between each chamber, a voltage transformer is arranged in the detection module 2, the detection module 2 detects voltage and outputs voltage measurement data to the control module 3, the control module 3 outputs a control signal to the fault processing module 4, an arc extinguishing coil is arranged on the fault processing module 4, shielding nets 5 are respectively arranged in the three independent chambers inside the device housing 1, the shielding nets 5 are grounded, the detection module 2, the control module 3, and the fault processing module 4 are respectively installed in the shielding nets 5 in the three independent chambers, a filtering circuit is arranged in the detection module 4, and a voltage signal detected by the secondary circuit of the voltage transformer is filtered by the filtering circuit and then transmitted to the control module 3;

[0030] The detection module includes a voltage transformer and a current transformer. The voltage transformer uses a JDZX9-10 type voltage transformer, and the current transformer uses a LZZBJ9-10 type current transformer. The data collected by the open triangle voltage of the voltage transformer and the three-phase voltage of the bus are filtered by the filter circuit and transmitted to the control module 3. The current transformer is used to collect the system grounding current and transmit the collected current signal to the control module 3. The filter circuit is a bandpass filter circuit, which is formed by cascading a low-pass filter LT6604IUFF-2.5 and a high-pass filter HFCN-7971+. The cutoff frequency of the high-pass filter is lower than the cutoff frequency of the low-pass filter. The voltage data collected by the voltage transformer is filtered out by the bandpass filter to remove the interfering high-frequency and low-frequency signals, and then the signal is transmitted to the control module 3. The control module 3 uses the STM32F407VET6 chip, which is based on ARM Cortex-M4 The fault processing module 4 includes an arc extinguishing unit and a harmonic elimination unit. The arc extinguishing unit includes an arc extinguishing contactor and an arc extinguishing coil. The arc extinguishing contactor is a CKJ5-400 / 1140 AC vacuum contactor. The arc extinguishing coil is an XDZ-100 / 10 arc extinguishing coil. The harmonic elimination unit includes a harmonic elimination resistor and a thyristor gate. The harmonic elimination resistor is an RXQ-10 harmonic elimination resistor, and the thyristor gate is a KP500-12 Type thyristor, the thyristor gate is used to control the switching of the harmonic elimination resistor. The control module 3 analyzes and calculates the data collected from the open triangle voltage of the voltage transformer and the three-phase voltage of the bus, and calculates the bus three-phase voltage amplitude, phase and open triangle side voltage amplitude and other parameters according to the collected voltage and current signals. When the open triangle side voltage is greater than the set value and lasts for more than 60s, the controller controls the arc extinguishing contactor to quickly switch to the arc extinguishing coil, and implements the detection of the grounding current, and adjusts the compensation degree of the arc extinguishing coil according to the size of the grounding current. When the three-phase voltages of the bus increase at the same time and the three-phase voltage amplitudes are basically equal, the thyristor gate is controlled to be triggered, the harmonic elimination resistor is switched on, the resonance condition is destroyed, and the bus voltage is continuously monitored. After the resonance is eliminated, the thyristor gate is controlled to be disconnected to complete the harmonic elimination operation.

[0031] The detection module 2, the control module 3, and the fault processing module 4 are installed in separate chambers in the device housing 1, and each module is surrounded by a shielding net 5, and the shielding net 5 is used to reduce external electromagnetic interference. During the operation of the device, the influence of the magnetic field generated by the arc suppression coil on the fault processing module 4 on the voltage transformer on the detection module 2 is reduced, the anti-electromagnetic interference performance of each module is improved, and the accuracy of the voltage detection of the detection module 2 is improved;

[0032] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, a mounting frame 12 is respectively provided in three independent chambers inside the device housing 1, and the detection module 2, the control module 3, and the fault processing module 4 are respectively arranged on the mounting frames 12 in the three chambers inside the device housing 1, and an annular slide rail 13 is provided on the mounting frame 12, and a moving rack 14 is slidably installed inside the annular slide rail 13, and a rolling rod 15 is rotatably installed inside the mounting frame 12, and a shielding net 5 is wound on the rolling rod 15, and one end of the shielding net 5 is fixedly connected to a moving seat 16, and the moving seat 16 is slidably installed on the annular slide rail 13, and a latch 17 is provided on the moving seat 16, and the latch 17 is inserted into the tooth groove on the moving rack 14, and a support frame 18 is provided on the annular slide rail 13, and a driving wheel 21 is rotatably installed on the support frame 18, and the driving wheel 21 contacts the inner side of the device housing 1, and a driven wheel 22 is rotatably installed on the annular slide rail 13, and the driven wheel 22 meshes with the moving rack 14, and the driving wheel 21 drives the driven wheel 22 to rotate through the shaft and the gear connection;

[0033] A torsion spring 23 is installed on the rolling rod 15, and the torsion spring 23 applies a torsion force to make the rolling rod 15 rotate. When the pulling force of the moving seat 16 on the shielding net 5 is less than the torsion force of the torsion spring 23, the rolling rod 15 rotates to reel in the shielding net 5.

[0034] When installing and maintaining the detection module 2, the control module 3, and the fault handling module 4, the mounting frame 12 is pulled out of the chamber inside the device housing 1, and the rolling rod 15 rotates under the action of the torsion spring 23, thereby pulling the shielding net 5 to be wound around the rolling rod 15, thereby recovering the shielding net 5. At this time, there is no shielding net 5 on the annular slide rail 13, which facilitates the installation and maintenance of the circuit components on each module;

[0035] After completing the installation and maintenance, the mounting frame 12 is inserted into the chamber inside the device housing 1. When the mounting frame 12 enters the device housing 1, the driving wheel 21 on the support frame 18 contacts the inner wall of the device housing 1. As the mounting frame 12 is inserted into the device housing 1, the driving wheel 21 rotates under the friction between the inner wall of the device housing 1, and the driving wheel 21 drives the driven wheel 22 to rotate. The driven wheel 22 rotates to push the moving rack 14 in the annular slide groove to move in the annular slide rail 13. As the moving rack 14 moves, the moving rack 14 moves, and the moving seat 16 is pushed to move through the latch teeth 17. When the moving seat 16 moves, the shielding net 5 is pulled to move along the annular slide rail 13. When the movable seat 16 moves from one side of the mounting frame 12 to the other side, the shielding net 5 forms a cylindrical space on the upper part of the mounting frame 12, thereby completing the laying of the shielding net 5. In this process, when the mounting frame 12 is pulled out of the device housing 1, the shielding net 5 is retracted under the action of the winding rod 15 and the torsion spring 23, and when the mounting frame 12 is inserted into the device housing 1, the shielding net 5 can be laid out through the annular slide rail 13 and the movable seat 16. When the mounting frame 12 is not installed, it is convenient to install and maintain the module circuit components on the mounting frame 12. When the mounting frame 12 is installed, the shielding net 5 can be automatically laid, which greatly improves the convenience of installation and maintenance;

[0036] A sliding roller 60 is installed on the annular slide rail 13, and the sliding roller 60 contacts the side of the moving rack 14. The sliding roller 60 supports the side of the moving rack 14 in the annular slide rail 13, reduces the friction of the moving rack 14 on the annular slide rail 13, and facilitates the movement of the moving rack 14.

[0037] Embodiment 2:

[0038] On the basis of Example 1, Figure 3 As shown, the annular slide rail 13 includes an upper half-ring slide rail 31 and a lower half-ring slide rail 32, and the movable rack 14 is also divided into two sections corresponding to the upper half-ring slide rail 31 and the lower half-ring slide rail 32, and is slidably located in the upper half-ring slide rail 31 and the lower half-ring slide rail 32 respectively;

[0039] The annular slide rail 13 can be split into an upper half-ring slide rail 31 and a lower half-ring slide rail 32. When installing and maintaining the detection module 2, the control module 3, and the fault handling module 4, the annular slide rail 13 can be split to facilitate the installation of each module;

[0040] A positioning groove 41 is respectively provided on both sides of the support frame 18 and the mounting frame 12, and a top column 42 is slidably installed in the positioning groove 41, and one end of the top column 42 extends out of the positioning groove 41 and is connected to a pressure plate 44, and a support spring 43 is provided between the mounting frame 12 and the pressure plate 44, and the support spring 43 applies a force on the pressure plate 44 in a direction away from the positioning groove 41, and a chamfer is provided on the other end of the top column 42, and a first docking rod 45 is slidably installed on the side of the upper semi-ring slide rail 31, and a second docking rod 46 is provided on the side of the lower semi-ring slide rail 32, and the end of the first docking rod 45 is inserted into the positioning groove 41 on the support frame 18, and the end of the first docking rod 45 can contact the chamfer on the top column 42, and the end of the second docking rod 46 is inserted into the positioning groove 41 on the mounting frame 12, and the second docking rod 46 can contact the chamfer on the top column 42 in the positioning groove 41 on the mounting frame 12, and the first docking rod 45 can be inserted into the second docking rod 46;

[0041] When the mounting frame 12 is inserted into the device housing 1, the pressure plate 44 on the top column 42 contacts the inner wall of the cavity in the device housing 1, and the inner wall of the cavity exerts a pressure on the pressure plate 44, thereby pushing the top column 42 to retract into the positioning groove 41, wherein the top column 42 in the positioning groove 41 on the support frame 18 moves, and the chamfered surface at the end of the top column 42 pushes the first docking rod 45 to move downward, while the top column 42 in the positioning groove 41 on the mounting frame 12 moves, and the chamfered surface at the end of the top column 42 pushes the second docking rod 46 to move upward, thereby allowing the first docking rod 45 to be inserted into the second docking rod 46, and utilizing the first docking rod 45 and the second docking rod 46 docking improves the stability of the connection between the upper semi-ring slide rail 31 and the lower semi-ring slide rail 32, so that the connection between the two can resist a certain force perpendicular to the annular slide rail 13. Furthermore, the support spring 43 inside the positioning groove 41 exerts an external force on the top column 42 toward the positioning groove 41, so that the top column 42 pushes the top plate to always exert an elastic pressure on the inner wall of the cavity. After the installation of the mounting frame 12 is completed, the elastic force of the top column 42 and the pressure plate 44 on the inner wall of the cavity can form a buffer for the mounting frame 12, thereby forming anti-seismic protection for the detection module 2, the control module 3, and the fault handling module 4 installed on the mounting frame 12.

[0042] Embodiment 3:

[0043] On the basis of Example 1, Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, a buffer column 51 is slidably mounted on the support frame 18, a buffer box 52 is fixed on the buffer column 51, a buffer spring 53 is provided between the buffer box 52 and the support frame 18, a drive shaft 54 ​​is rotatably mounted on the buffer box 52, a drive wheel 21 is mounted on the drive shaft 54, a first bevel gear 55 is mounted on the drive shaft 54, a second bevel gear 56 is rotatably mounted on the buffer box 52, the first bevel gear 55 meshes with the second bevel gear 56, a transmission shaft 57 is rotatably mounted on the support frame 18, the lower end of the transmission shaft 57 meshes with the driven wheel 22 through a gear connection, the second bevel gear 56 is connected to the transmission shaft 57 through a keyway, and the second bevel gear 56 can slide along the axial direction of the transmission shaft 57;

[0044] When the mounting frame 12 is inserted into the chamber in the device housing 1, the buffer spring 53 presses the buffer box 52 upward, so that the driving wheel 21 on the buffer box 52 is close to the upper side wall of the device housing 1, and the driving wheel 21 drives the driving shaft 54 ​​to rotate, and the driving shaft 54 ​​drives the second bevel gear 56 to rotate through the first bevel gear 55. When the second bevel gear 56 rotates, it drives the transmission shaft 57 on the support to rotate, and the transmission shaft 57 drives the driven wheel 22 to rotate;

[0045] A worm wheel 58 is coaxially arranged on the driven wheel 22, and the transmission shaft 57 and the worm wheel 58 form a worm gear mechanism, which is used to lock the driven wheel 22, so that only the driving wheel 21 drives the driven wheel 22;

[0046] A first foot rod 61 and a second foot rod 62 are hingedly installed at the bottom of the mounting frame 12, a tension spring 63 is provided between the lower end of the first foot rod 61 and the lower end of the second foot rod 62, a first connecting rod 64 is hingedly installed at the middle of the first foot rod 61, and a second connecting rod 65 is hingedly installed at the middle of the second foot rod 62. The first connecting rod 64 and the second connecting rod 65 are hingedly installed on a floating seat 66, a floating column 67 is fixedly installed on the floating seat 66, the upper end of the floating column 67 slides through the mounting frame 12, and a circuit element mounting plate 68 is fixed to the upper end of the floating column 67;

[0047] The circuit structures on the detection module 2, the control module 3, and the fault processing module 4 are respectively mounted on the circuit element mounting board 68 in the corresponding chambers in the device housing 1, and the circuit element mounting board 68 is supported by the floating column 67 so that the circuit element mounting board 68 is suspended, which is beneficial to the heat dissipation of the circuit elements on the circuit element mounting board 68;

[0048] A pad 69 is provided at the lower part of the mounting frame 12, and a buffer groove 70 is provided on the pad 69. Casters 71 are respectively installed at the lower ends of the first foot rod 61 and the second foot rod 62, and the casters 71 are located in the buffer groove 70. The casters 71 are used to reduce the resistance of the first foot rod 61 and the second foot rod 62 to move in the buffer groove 70. The pad 69 is used to limit the lower ends of the first foot rod 61 and the second foot rod 62 to ensure the consistency of the deflection angles of the first foot rod 61 and the second foot rod 62. When the mounting frame 12 is inserted into the chamber in the device housing 1, the first foot rod 61 and the second foot rod 62 can be uniformly squeezed by squeezing the pad 69, so as to facilitate the installation of the mounting frame 12;

[0049] The upper part of the mounting frame 12 uses a buffer spring 53 to support the buffer box 52, and the lower part of the mounting frame 12 is supported by a first foot rod 61 and a second foot rod 62. A tension spring 63 is connected between the first foot rod 61 and the second foot rod 62, thereby supporting the mounting frame 12. When the device is hit in the vertical direction, the vertical inertial displacement of the mounting frame 12 can be buffered, and the vibration transmitted by the device housing 1 can be buffered.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An arc extinguishing and harmonic elimination device, characterized in that: include: The device shell comprises a detection module, a control module and a fault processing module. The interior of the device shell is divided into three independent chambers. An isolation plate is arranged between each chamber. A voltage transformer is arranged in the detection module. The detection module detects voltage and outputs voltage measurement data to the control module. The control module outputs a control signal to the fault processing module. An arc extinguishing coil is arranged on the fault processing module. Shielding nets are arranged in the three independent chambers inside the device shell respectively. The shielding nets are grounded. The detection module, the control module and the fault processing module are respectively installed in the shielding nets in the three independent chambers. A filtering circuit is arranged in the detection module. The voltage signal detected by the voltage transformer is filtered by the filtering circuit and then transmitted to the control module.

2. The arc extinguishing and harmonic elimination device according to claim 1, characterized in that: The three independent chambers inside the device shell are respectively provided with mounting frames, the mounting frame is provided with an annular slide rail, a movable rack is slidably installed inside the annular slide rail, a winding rod is rotatably installed inside the mounting frame, the shielding net is wound around the winding rod, one end of the shielding net is fixedly connected to the movable seat, the movable seat is slidably installed on the annular slide rail, the movable seat is provided with a latch tooth, the latch tooth is inserted into the tooth groove on the movable rack, the annular slide rail is provided with a supporting frame, a driving wheel is rotatably installed on the supporting frame, the driving wheel contacts the inner side surface of the device shell, a driven wheel is rotatably installed on the annular slide rail, the driven wheel meshes with the movable rack, and the driving wheel drives the driven wheel to rotate through a shaft and a gear connection.

3. The arc extinguishing and harmonic elimination device according to claim 2, characterized in that: A torsion spring is installed on the rolling rod, and the torsion spring applies a torsion force to make the rolling rod rotate.

4. The arc extinguishing and harmonic elimination device according to claim 2, characterized in that: The annular slide rail comprises an upper half-ring slide rail and a lower half-ring slide rail, and the movable rack is also divided into two sections corresponding to the upper half-ring slide rail and the lower half-ring slide rail, and is respectively slidably located in the upper half-ring slide rail and the lower half-ring slide rail.

5. The arc extinguishing and harmonic elimination device according to claim 4, characterized in that: The support frame and the mounting frame are respectively provided with positioning grooves, and a top column is slidably installed in the positioning groove, and one end of the top column extends out of the positioning groove and is connected to a pressure plate, and a supporting spring is provided between the mounting frame and the pressure plate, and the supporting spring applies a force on the pressure plate in a direction away from the positioning groove. The other end of the top column is provided with a chamfered surface, and a first docking rod is slidably installed on the side of the upper semi-ring slide rail, and a second docking rod is provided on the side of the lower semi-ring slide rail, the end head of the first docking rod is inserted into the positioning groove on the support frame, the end head of the first docking rod can contact the chamfered surface on the top column, the end head of the second docking rod is inserted into the positioning groove on the mounting frame, the second docking rod can contact the chamfered surface of the top column in the positioning groove on the mounting frame, and the first docking rod can be inserted into the second docking rod.

6. The arc extinguishing and harmonic elimination device according to claim 2, characterized in that: A buffer column is slidably installed on the support frame, a buffer box is fixed on the buffer column, a buffer spring is provided between the buffer box and the support frame, a driving shaft is rotatably installed on the buffer box, the driving wheel is installed on the driving shaft, a first bevel gear is installed on the driving shaft, a second bevel gear is rotatably installed on the buffer box, the first bevel gear meshes with the second bevel gear, a transmission shaft is rotatably installed on the support frame, the lower end of the transmission shaft meshes with the driven wheel through a gear connection, the second bevel gear is connected to the transmission shaft through a keyway, and the second bevel gear can slide along the axial direction of the transmission shaft.

7. The arc extinguishing and harmonic elimination device according to claim 6, characterized in that: A worm wheel is coaxially arranged on the driven wheel, and the transmission shaft and the worm wheel form a worm gear mechanism.

8. The arc extinguishing and harmonic elimination device according to claim 2, characterized in that: The bottom of the mounting frame is hingedly installed with a first foot rod and a second foot rod, a tension spring is provided between the lower end of the first foot rod and the lower end of the second foot rod, a first connecting rod is hingedly installed at the middle part of the first foot rod, and a second connecting rod is hingedly installed at the middle part of the second foot rod, the first connecting rod and the second connecting rod are hinged on a floating seat, a floating column is fixedly installed on the floating seat, the upper end of the floating column slides through the mounting frame, and a circuit element mounting plate is fixed to the upper end of the floating column.

9. The arc extinguishing and harmonic elimination device according to claim 8, characterized in that: A pad is provided at the lower part of the mounting frame, a buffer groove is provided on the pad, and casters are respectively installed at the lower ends of the first foot rod and the second foot rod, and the casters are located in the buffer groove.

10. The arc extinguishing and harmonic elimination device according to claim 2, characterized in that: A sliding roller is installed on the annular sliding rail, and the sliding roller contacts the side of the moving rack.

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