A variable frequency power supply for transformer testing system

Abstract

The invention belongs to the technical field of transformer equipment, and specifically is a variable frequency power supply for a transformer testing system, comprising a touch panel, a PID control module, a voltage detection and regulation control module, a transformer group, a filter module, a protection module, an accidental power failure protection module, a communication module, and an exhaust module; the output voltage of the circuit is adjusted by utilizing the SPWM hardware adjustment technology, and the output voltage of the circuit is stabilized by adopting the PID control by utilizing the detection of the feedback amount; the high-frequency SPWM hardware adjustment technology has fast response speed and stable output; the hardware waveform synthesis and PID control are adopted to realize the stable output waveform and high response speed; the touch panel is used as a control panel, and has a parameter memory function, which simplifies the operation; the software and hardware combined power supply device protection mode is adopted, and overheating, overcurrent, short circuit and other protections can be performed, and the safety is extremely high; the high-power IGBT / IPM driver is adopted, and the driver has a large overload capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer equipment, in particular to a variable frequency power supply for a transformer testing system. Background Art

[0002] With the development and progress of science and technology, automation technology is becoming more and more mature. Traditional manual transformer testing equipment can no longer meet the social needs of high efficiency, and automated testing systems are highly praised by users.

[0003] However, as automated test systems gradually occupy the market, test systems are often limited by unstable voltage, which greatly affects the accuracy and efficiency of transformer automated test systems; the inability to adjust in real time causes a lag in test results, making it difficult to make an accurate judgment on product quality; and in order to eliminate the impact of voltage disturbances, the wiring of measuring equipment usually needs to consider reducing disturbances through negative feedback, which greatly increases the technical requirements for personnel and operating costs.

[0004] To this end, the present invention provides a variable frequency power supply for use in a transformer testing system. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a variable frequency power supply for a transformer testing system according to the present invention comprises a touch panel, a PID control module, a voltage detection and regulation control module, a transformer group, a filter module, a protection module, an accidental power failure protection module, a communication module, and an exhaust module;

[0007] The touch panel adopts a liquid crystal display screen, and the output selection of voltage and frequency is performed through the touch panel;

[0008] The PID control module is adjusted based on the feedback of output voltage, output frequency and waveform, and then modulated by SPWM technology for feedback control;

[0009] The filtering module adopts high-frequency SPWM hardware filtering technology, uses a triangular wave as a modulation signal, and performs pulse modulation on the carrier, achieving a low response time and a stable output under high-frequency switching;

[0010] The protection module includes a thermistor, a fuse, a circuit breaker, and a leakage protection switch to provide all-round protection for the power supply;

[0011] The voltage detection and regulation control module adopts IGBT hardware drive, and its control system has parameter memory function. Its regulation system is directly connected to the motor of the transformer, and the size of the transformer output voltage is adjusted by adjusting the frequency;

[0012] The accidental power failure protection module includes a battery pack, which is used to ignite the capacitor in case of sudden power failure;

[0013] The communication module includes a serial port USB and an RS485 interface;

[0014] The exhaust module is used to ventilate and cool the voltage detection and regulation control module;

[0015] The transformer group is connected to the input end of the voltage detection and regulation module. The connecting line uses high voltage and thick copper wire, and then enters the filtering module and the accidental power-off protection module to achieve high-quality filtering of the transformer input. The voltage detection and regulation control module uses four groups of IGBT modules for high-frequency disconnection, and realizes pulse modulation of the carrier in hardware; the PID control module after filtering processes the parameters detected by the voltage detection and regulation control module to determine the quality of the filtering, and performs secondary filtering; the touch panel is directly connected to the filtering module, the voltage detection and regulation control module, and the PID control module, and can collect the data feedback from these systems in real time and display them on the touch panel; when the variable frequency power supply is running, the accidental power-off protection module is charged, and when the power is accidentally cut off, the battery pack in the accidental power-off protection module will be discharged more slowly to realize the display of the touch panel; when the filtering module is started When the cabinet is powered on, the exhaust module starts to cool down the cabinet to avoid overheating. The protection module responds quickly to load, current and temperature. When overload, overheating and other problems occur, the load will be cut off in time to protect personnel safety. The variable frequency power supply uses SPWM hardware adjustment technology to adjust the output voltage of the circuit, and uses the detection of feedback quantity and PID control to stabilize the output voltage of the circuit. High-frequency SPWM hardware adjustment technology has fast response speed and stable output. Hardware waveform synthesis and PID control are used to achieve stable output waveform and high response speed. A touch panel is used as the control panel, and it has a parameter memory function to simplify the operation. The software and hardware combined power supply device protection mode can be used to protect against overheating, overcurrent, short circuit, etc., with extremely high safety. A high-power IGBT / IPM driver is used with a large overload capacity.

[0016] Preferably, the exhaust module includes a mounting frame, a driving component is fixed inside the mounting frame, a rotating column is fixed at the output end of the driving component, the driving component is used to drive the rotating column to rotate, a rotating fan blade is fixed to the outside of the rotating column, the mounting frame is connected to a shell by bolts on the outside, a plurality of filter grilles are fixed inside the shell and on one side close to the mounting frame, and the touch panel is fixedly connected to the shell; when working, the mounting frame is mounted to the shell by bolts during use, and a certain dust-proof effect can be achieved by setting the filter grille. During the operation of the variable frequency power supply, the driving component is energized to drive the rotating column to rotate, and the rotating column rotates to drive the rotating fan blade to rotate to generate airflow, thereby dissipating heat to the inside of the shell, achieving a heat dissipation effect.

[0017] Preferably, a transmission rod is fixed to the side of the rotating column away from the driving component, a matching ring is fixed to the outside of the transmission rod, a connecting ring is fixed to the outside of the matching ring, a protective ring is fixed to the outside of the connecting ring, the diameter of the inner wall of the protective ring is larger than the outer diameter of the connecting ring, and water is placed between the connecting ring and the protective ring; during operation, as the rotating column rotates, it will simultaneously drive the transmission rod to rotate, and the rotation of the transmission rod will drive the matching ring and the connecting ring and protective ring outside it to rotate together, and in this process, the water between the connecting ring and the protective ring will also roll to a certain extent, and in the process of water rolling, the protective ring will be cooled down, and then the external rotating column will be cooled down, thereby improving the heat dissipation effect of the driving component and the equipment to a certain extent.

[0018] Preferably, a plurality of counterweight plugs are slidably connected to the inside of the connecting ring, and the plurality of counterweight plugs are distributed in an array. A reset spring is fixed between the counterweight plug and the matching ring, and a telescopic rod is installed inside the reset spring. The two ends of the telescopic rod are respectively fixedly connected to the matching ring and the counterweight plug, and a stirring blade is fixed to the side of the counterweight plug away from the reset spring. During operation, as the connecting ring rotates, the counterweight plug will stretch the reset spring under the action of centrifugal force and move, and the movement of the counterweight plug will drive the movement of the stirring blade. At this time, the stirring blade will extend from the inside of the connecting ring, thereby stirring the water flow, further improving the heat dissipation and cooling effect.

[0019] Preferably, an extrusion block is slidably connected inside the connecting ring and on the side of the toggle blade close to the mating ring, and a liquid storage bag is provided on the side of the extrusion block away from the return spring; during operation, after the equipment is shut down, the return spring will drive the counterweight plug to squeeze the extrusion block during the resetting process, and the extrusion block will slide inside the connecting ring after being subjected to the extrusion force, thereby squeezing the liquid storage bag, and the insect repellent inside the liquid storage bag will be sprayed out, so that the insect repellent liquid can be automatically sprayed after the equipment is shut down to prevent insects and rodents from drilling into the equipment through the filter grille and gnawing on the cables.

[0020] Preferably, a pair of conduits are connected to the outside of the liquid storage bag, and one-way valves are installed inside the pair of conduits. The one-way valves have opposite conducting directions, and an expansion spring is fixed inside the liquid storage bag. During operation, a pair of conduits are set up, and one-way valves with different diversion directions are installed inside them. When the liquid storage bag rotates to the top of the transmission rod, the conduit at the bottom end of the liquid storage bag can discharge normally, and the conduit at the top end of the liquid storage bag will reset and inhale under the action of the expansion spring when it is started again. Correspondingly, the liquid storage bag located below the transmission rod, at this time, because the conduit at the discharge end is located above the liquid storage bag, the touch panel will discharge air from the inside of the liquid storage bag, so that the amount of liquid discharged each time can be controlled, thereby increasing the effectiveness of the equipment in repelling insects and rats.

[0021] Preferably, a separator ring is fixed inside the protective ring, and the separator ring is made of polyethylene material. A plurality of effervescent tablets are placed between the separator ring and the protective ring, and a pair of elastic membranes are fixed on the side of the protective ring close to the drive assembly and between the connecting ring and the separator ring. During operation, it should be noted that the separator ring is made of polyethylene material, and the melting point of the separator ring is controlled at one hundred degrees Celsius. In this way, when a fire occurs inside the equipment due to an abnormal circuit, the water temperature between the connecting ring and the protective ring rises rapidly and eventually reaches a boiling state. At this time, the separator ring melts, causing the effervescent tablet to fall into the water, and the separator ring reacts with the effervescent tablet to produce a large amount of gas, resulting in an increase in pressure between the connecting ring and the protective ring. Eventually, the increased pressure will squeeze the elastic membrane and cause it to escape, and the escaping gas will blow to the inside of the shell, thereby performing a fire extinguishing operation on the inside of the shell.

[0022] Preferably, a plurality of wind whistles are connected through the outside and inside of the rotating column; when in operation, during the process of gas escape, the airflow will first flow through the wind whistle, and the airflow will drive the wind whistle to vibrate and generate a whistle sound in the process of flowing through the wind whistle, thereby alerting external employees of abnormalities.

[0023] Preferably, a plurality of ventilation holes are provided inside the elastic membrane on the side away from the separating ring, a pair of fixing frames are fixed on the side of the protective ring close to the driving assembly, a tension spring is fixed on the side of the fixing frame close to the elastic membrane, a knocking block is fixed on the end of the tension spring away from the fixing frame, the knocking block is fixedly connected to the elastic membrane, and the tension spring is in a stretched state in an initial state; during operation, after the elastic membrane is broken by pressure, the tension spring will reset under the action of elastic potential energy, thereby pulling the knocking block to collide back and forth with the fixing frame, and a mechanical impact sound will be generated when the knocking block and the fixing frame collide back and forth, further reminding external employees.

[0024] Preferably, a pair of knocking blocks are respectively fixed with plug-in contacts and circuit-breaking contacts on one side close to each other, and the plug-in contacts and circuit-breaking contacts are plugged into each other, and the plug-in contacts and circuit-breaking contacts are connected to the signals of the accidental power-off protection module through lines, and the plug-in contacts and circuit-breaking contacts are waterproofed; when working, in the process of resetting a pair of tension springs, the knocking blocks will separate from each other, which will drive the plug-in contacts and circuit-breaking contacts to separate. When the plug-in contacts and circuit-breaking contacts are separated, the battery pack in the accidental power-off protection module will be disconnected and no longer supply power, thereby preventing the outflowing water from being electrified and causing injuries to maintenance personnel.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The variable frequency power supply for transformer testing system described in the present invention adjusts the output voltage of the circuit by using SPWM hardware adjustment technology, and stabilizes the output voltage of the circuit by using PID control based on the detection of feedback quantity; the high frequency SPWM hardware adjustment technology has fast response speed and stable output; the hardware waveform synthesis and PID control are used to achieve stable output waveform and high response speed; the touch panel is used as the control panel, and has a parameter memory function, which simplifies the operation; the software and hardware combined power supply device protection mode is used to perform overheating, overcurrent, short circuit and other protections, and has extremely high safety; the high power IGBT / IPM driver is used to have a large overload capacity.

[0027] 2. The variable frequency power supply for the transformer testing system described in the present invention squeezes the squeezing block through the counterweight plug, and then squeezes the liquid storage bag. At this time, the insect repellent liquid inside the liquid storage bag will be sprayed out. In this way, the insect repellent liquid can be automatically sprayed after the equipment is shut down to prevent insects and rodents from drilling into the equipment through the filter grille to bite the cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1 It is a structural block diagram of the variable frequency power supply of the present invention;

[0030] Figure 2 It is a three-dimensional diagram of the shell structure in the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the mounting frame in the present invention;

[0032] Figure 4 It is a structural schematic diagram of a second embodiment of the mounting frame structure in the present invention;

[0033] Figure 5 The present invention Figure 4 A partial enlarged view of the middle part;

[0034] Figure 6 The present invention Figure 4 A partial enlarged view of point B in the middle;

[0035] Figure 7 It is a schematic diagram of the protection ring structure in the present invention.

[0036] In the figure: 1. touch panel; 2. shell; 3. filter grille; 4. mounting frame; 5. drive assembly; 6. rotating column; 7. rotating fan blade; 8. transmission rod; 9. matching ring; 10. connecting ring; 11. protective ring; 12. counterweight plug; 13. reset spring; 14. shifting blade; 15. extrusion block; 16. liquid storage capsule; 17. expansion spring; 18. catheter; 19. separation ring; 20. effervescent tablet; 21. elastic membrane; 22. wind whistle; 23. knocking block; 24. tension spring; 25. fixing frame; 26. plug-in contact; 27. circuit-breaking contact. DETAILED DESCRIPTION

[0037] 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 in conjunction with specific implementation methods.

[0038] Embodiment 1

[0039] like Figure 1 As shown, a variable frequency power supply for a transformer testing system according to an embodiment of the present invention includes a touch panel 1, a PID control module, a voltage detection and regulation control module, a transformer group, a filter module, a protection module, an accidental power failure protection module, a communication module, and an exhaust module;

[0040] The touch panel 1 adopts a liquid crystal display screen, and the output selection of voltage and frequency is performed through the touch panel 1;

[0041] The PID control module is adjusted based on the feedback of output voltage, output frequency and waveform, and then modulated by SPWM technology for feedback control;

[0042] The filtering module adopts high-frequency SPWM hardware filtering technology, uses a triangular wave as a modulation signal, and performs pulse modulation on the carrier, achieving a low response time and a stable output under high-frequency switching;

[0043] The protection module includes a thermistor, a fuse, a circuit breaker, and a leakage protection switch to provide all-round protection for the power supply;

[0044] The voltage detection and regulation control module adopts IGBT hardware drive, and its control system has parameter memory function. Its regulation system is directly connected to the motor of the transformer, and the size of the transformer output voltage is adjusted by adjusting the frequency;

[0045] The accidental power failure protection module includes a battery pack, which is used to ignite the capacitor in case of sudden power failure;

[0046] The communication module includes a serial port USB and an RS485 interface;

[0047] The exhaust module is used to ventilate and cool the voltage detection and regulation control module;

[0048] The transformer group is connected to the input end of the voltage detection and regulation module. The connecting line uses high voltage and thick copper wire, and then enters the filtering module and the accidental power-off protection module to achieve high-quality filtering of the transformer input. The voltage detection and regulation control module uses four groups of IGBT modules for high-frequency disconnection, and realizes pulse modulation of the carrier in hardware; the PID control module after filtering processes the parameters detected by the voltage detection and regulation control module to determine the quality of the filtering, and performs secondary filtering; the touch panel 1 is directly connected to the filtering module, the voltage detection and regulation control module, and the PID control module, and can collect the data fed back by these systems in real time and display them on the touch panel 1; when the variable frequency power supply is running, the accidental power-off protection module is charged, and when the power is accidentally cut off, the battery pack in the accidental power-off protection module will be discharged more smoothly to realize the display of the touch panel 1; when the filtering module When started, the exhaust module starts to cool down the cabinet to avoid overheating; the protection module responds quickly to load, current and temperature, and will cut off the load in time to protect personnel safety when overload, overheating and other problems occur; the variable frequency power supply uses SPWM hardware adjustment technology to adjust the output voltage of the circuit, and uses the detection of feedback quantity and PID control to stabilize the output voltage of the circuit; high-frequency SPWM hardware adjustment technology has fast response speed and stable output; hardware waveform synthesis and PID control are used to achieve stable output waveform and high response speed; touch panel 1 is used as the control panel, and it has parameter memory function to simplify operation; the software and hardware combined power supply device protection mode can perform overheating, overcurrent, short circuit and other protections, with extremely high safety; high-power IGBT / IPM driver is used with large overload capacity.

[0049] like Figures 2 to 3As shown, the exhaust module includes a mounting frame 4, a driving component 5 is fixed inside the mounting frame 4, a rotating column 6 is fixed at the output end of the driving component 5, the driving component 5 is used to drive the rotating column 6 to rotate, and a rotating fan blade 7 is fixed to the outside of the rotating column 6, the mounting frame 4 is connected to the shell 2 by bolts on the outside, a plurality of filter grilles 3 are fixed inside the shell 2 and on one side close to the mounting frame 4, and the touch panel 1 is fixedly connected to the shell 2; when working, the mounting frame 4 is installed on the shell 2 by bolts when in use, and a certain dust-proof effect can be achieved by setting the filter grille 3. During the operation of the variable frequency power supply, the driving component 5 is energized to drive the rotating column 6 to rotate, and the rotating column 6 rotates to drive the rotating fan blade 7 to rotate to generate airflow, thereby dissipating heat inside the shell 2 and achieving a heat dissipation effect.

[0050] Embodiment 2

[0051] like Figure 4 and Figure 7 As shown, compared with Example 1, another implementation of the present invention is: a transmission rod 8 is fixed to the side of the rotating column 6 away from the driving component 5, a matching ring 9 is fixed to the outside of the transmission rod 8, a connecting ring 10 is fixed to the outside of the matching ring 9, a protective ring 11 is fixed to the outside of the connecting ring 10, the diameter of the inner wall of the protective ring 11 is larger than the outer diameter of the connecting ring 10, and water is placed between the connecting ring 10 and the protective ring 11; when working, during the rotation of the rotating column 6, it will simultaneously drive the transmission rod 8 to rotate, and the rotation of the transmission rod 8 will drive the matching ring 9 and the connecting ring 10 and the protective ring 11 outside it to rotate together, and in this process, the water between the connecting ring 10 and the protective ring 11 will also roll to a certain extent, and during the rolling of the water flow, the protective ring 11 will be cooled down, and then the external rotating column 6 will be cooled down, so that the heat dissipation effect of the driving component 5 and the equipment can be improved to a certain extent.

[0052] like Figure 7 As shown, a plurality of weight plugs 12 are slidably connected inside the connecting ring 10, and the plurality of weight plugs 12 are distributed in an array shape. A reset spring 13 is fixed between the weight plug 12 and the matching ring 9, and a telescopic rod is installed inside the reset spring 13. The two ends of the telescopic rod are respectively fixedly connected to the matching ring 9 and the weight plug 12, and a stirring blade 14 is fixed on the side of the weight plug 12 away from the reset spring 13. During operation, during the rotation of the connecting ring 10, the weight plug 12 will stretch the reset spring 13 under the action of centrifugal force and then move, and the movement of the weight plug 12 will drive the movement of the stirring blade 14. At this time, the stirring blade 14 will extend from the inside of the connecting ring 10, thereby stirring the water flow, further improving the heat dissipation and cooling effect.

[0053] like Figure 5As shown, an extrusion block 15 is slidably connected inside the connecting ring 10 and located on the side of the moving blade 14 close to the matching ring 9, and a liquid storage bag 16 is provided on the side of the extrusion block 15 away from the reset spring 13; during operation, after the equipment is shut down, the return spring 13 will drive the counterweight plug 12 to squeeze the extrusion block 15 during the resetting process, and the extrusion block 15 will slide inside the connecting ring 10 after being subjected to the extrusion force, thereby squeezing the liquid storage bag 16, and the insect repellent in the liquid storage bag 16 will be sprayed out at this time, so that the insect repellent liquid can be automatically sprayed after the equipment is shut down to prevent insects and rodents from drilling into the equipment through the filter grille 3 to bite the cables.

[0054] like Figure 5 As shown, a pair of conduits 18 are connected to the outside of the liquid storage capsule 16, and a one-way valve is installed inside the pair of conduits 18. The one-way valves have opposite conduction directions, and an expansion spring 17 is fixed inside the liquid storage capsule 16. During operation, a pair of conduits 18 are set, and one-way valves with different diversion directions are installed inside them. In this way, when the liquid storage capsule 16 rotates to the top of the transmission rod 8, the conduit 18 at the bottom end of the liquid storage capsule 16 can discharge liquid normally, and the conduit 18 at the top end of the liquid storage capsule 16 will reset and inhale under the action of the expansion spring 17 when it is started again. Correspondingly, the liquid storage capsule 16 located below the transmission rod 8, at this time, because the conduit 18 at the discharge end is located above the liquid storage capsule 16, the touch panel 1 will discharge air from the inside of the liquid storage capsule 16, so that the amount of liquid discharged each time can be controlled, so that the time effectiveness of the device in repelling insects and rats is increased.

[0055] like Figure 6 to Figure 7 As shown, a separator ring 19 is fixed inside the protective ring 11, and the separator ring 19 is made of polyethylene material. A plurality of effervescent tablets 20 are placed between the separator ring 19 and the protective ring 11. A pair of elastic membranes 21 are fixed on the side of the protective ring 11 close to the drive assembly 5 and between the connecting ring 10 and the separator ring 19. During operation, it should be noted that the separator ring 19 is made of polyethylene material, and the melting point of the separator ring 19 is controlled at one hundred degrees Celsius. In this way, when a fire occurs inside the device due to an abnormal circuit, the water temperature between the connecting ring 10 and the protective ring 11 rises rapidly and eventually reaches a boiling state. At this time, the separator ring 19 melts, causing the effervescent tablets 20 to fall into the water, and the separator ring 19 reacts with the effervescent tablets 20 to produce a large amount of gas, resulting in an increase in pressure between the connecting ring 10 and the protective ring 11. The increased pressure will eventually squeeze the elastic membrane 21 and cause it to escape, and the escaped gas will blow to the inside of the shell 2, thereby performing a fire extinguishing operation on the inside of the shell 2.

[0056] like Figure 6As shown, the rotating column 6 is connected with multiple wind whistles 22 on the outside and inside; when working, during the gas escape process, the airflow will first flow through the wind whistle 22. In the process of flowing through the wind whistle 22, the airflow will drive it to vibrate and produce a whistle sound, reminding external employees that there is an abnormality.

[0057] like Figure 6 As shown, a plurality of ventilation holes are provided inside the elastic membrane 21 on the side away from the separating ring 19, a pair of fixing frames 25 are fixed on the side of the protective ring 11 close to the driving assembly 5, a tension spring 24 is fixed on the side of the fixing frame 25 close to the elastic membrane 21, a knocking block 23 is fixed on the end of the tension spring 24 away from the fixing frame 25, the knocking block 23 is fixedly connected to the elastic membrane 21, and the tension spring 24 is in a stretched state in an initial state; during operation, after the elastic membrane 21 is broken by pressure, the tension spring 24 will reset under the action of elastic potential energy, thereby pulling the knocking block 23 to collide back and forth with the fixing frame 25, and a mechanical impact sound will be generated when the knocking block 23 and the fixing frame 25 collide back and forth, further reminding external employees.

[0058] like Figure 6 As shown, a plug-in contact 26 and a circuit-breaking contact 27 are fixed on one side of a pair of knocking blocks 23 close to each other, and the plug-in contact 26 and the circuit-breaking contact 27 are plugged in, and the plug-in contact 26 and the circuit-breaking contact 27 are connected to the signal of the accidental power-off protection module through a line, and the plug-in contact 26 and the circuit-breaking contact 27 are waterproofed; when working, in the process of resetting a pair of tension springs 24, the knocking blocks 23 will separate from each other, which will drive the plug-in contact 26 and the circuit-breaking contact 27 to separate. When the plug-in contact 26 and the circuit-breaking contact 27 are separated, the battery pack in the accidental power-off protection module will be disconnected and no longer supply power, thereby preventing the outflowing water from being electrified and causing injuries to maintenance personnel.

[0059] Working principle: The transformer group is connected to the input end of the voltage detection and regulation module. The connecting line uses high voltage and thick copper wire, and then enters the filter module and the accidental power-off protection module to achieve high-quality filtering of the transformer input, while the voltage detection and regulation control module uses four groups of IGBT modules for high-frequency disconnection, and realizes pulse modulation of the carrier in hardware; after filtering, the PID control module processes the parameters detected by the voltage detection and regulation control module to determine the quality of the filtering, and performs secondary filtering; the touch panel 1 is directly connected to the filter module, the voltage detection and regulation control module, and the PID control module, and can collect the data fed back by these systems in real time and display them on the touch panel 1; when the variable frequency power supply is running, the accidental power-off protection module is charged, and when the power is accidentally cut off, the battery pack in the accidental power-off protection module will be discharged more slowly to realize the display of the touch panel 1; when the filter When the module is started, the exhaust module will start to cool down the cabinet to avoid overheating. The protection module responds quickly to load, current and temperature. When overload, overheating and other problems occur, the load will be cut off in time to protect personnel safety. The variable frequency power supply uses SPWM hardware adjustment technology to adjust the output voltage of the circuit, and uses the detection of feedback quantity and PID control to stabilize the output voltage of the circuit. High-frequency SPWM hardware adjustment technology has fast response speed and stable output. Hardware waveform synthesis and PID control are used to achieve stable output waveform and high response speed. The touch panel 1 is used as the control panel, and it has parameter memory function to simplify the operation. The software and hardware combined power supply device protection mode can be used to protect against overheating, overcurrent, short circuit, etc., with extremely high safety. High-power IGBT / IPM driver is used, which has a large overload capacity.

[0060] When in use, the mounting frame 4 is mounted on the housing 2 by bolts. The filter grille 3 can achieve a certain dustproof effect. During the operation of the variable frequency power supply, the driving component 5 is powered on to drive the rotating column 6 to rotate. The rotating column 6 rotates to drive the rotating fan blades 7 to rotate to generate airflow, thereby dissipating heat inside the housing 2 and achieving a heat dissipation effect.

[0061] During the rotation of the rotating column 6, it will simultaneously drive the transmission rod 8 to rotate, and the rotation of the transmission rod 8 will drive the matching ring 9 and the connecting ring 10 and the protective ring 11 outside it to rotate together. In this process, the water between the connecting ring 10 and the protective ring 11 will also roll to a certain extent. During the rolling of the water flow, the protective ring 11 will be cooled down, and then the external rotating column 6 will be cooled down, so that the heat dissipation effect of the drive component 5 and the equipment can be improved to a certain extent; during the rotation of the connecting ring 10, the counterweight plug 12 will stretch the reset spring 13 under the action of centrifugal force and then move, and the movement of the counterweight plug 12 will drive the movement of the toggle blade 14. At this time, the toggle blade 14 will extend from the inside of the connecting ring 10, thereby toggling the water flow, further improving the heat dissipation and cooling effect;

[0062] After the equipment is shut down, the return spring 13 will be reset during which the counterweight plug 12 will be driven to squeeze the extrusion block 15. The extrusion block 15 will slide inside the connecting ring 10 after being squeezed, thereby squeezing the liquid storage bag 16. At this time, the insect repellent liquid inside the liquid storage bag 16 will be sprayed out. In this way, the insect repellent liquid can be automatically sprayed after the equipment is shut down to prevent insects and mice from drilling into the equipment through the filter grille 3 and biting the cables. By setting a pair of conduits 18, each of which is equipped with a one-way valve with different diversion directions, when the liquid storage bag 16 is When the capsule 16 rotates to the top of the transmission rod 8, the catheter 18 at the bottom of the liquid storage capsule 16 can discharge liquid normally, and the catheter 18 at the top of the liquid storage capsule 16 will be reset and inhaled under the action of the expansion spring 17 when it is started again. Correspondingly, the liquid storage capsule 16 located below the transmission rod 8, at this time, because the catheter 18 at the discharge end is located above the liquid storage capsule 16, the touch panel 1 will discharge air from the inside of the liquid storage capsule 16, so that the amount of liquid discharged each time can be controlled, so that the time-effectiveness of the device to repel insects and rats is increased;

[0063] It should be noted that the separation ring 19 is made of polyethylene material, and the melting point of the separation ring 19 is controlled at one hundred degrees Celsius. In this way, when a fire occurs inside the equipment due to an abnormal circuit, the water temperature between the connecting ring 10 and the protective ring 11 rises rapidly and eventually reaches a boiling state. At this time, the separation ring 19 melts, causing the effervescent tablet 20 to fall into the water, and the separation ring 19 reacts with the effervescent tablet 20 to produce a large amount of gas, resulting in an increase in the pressure between the connecting ring 10 and the protective ring 11. The increased pressure will eventually break the elastic membrane 21 and escape, and the escaped gas will blow to the inside of the shell 2, thereby performing a fire extinguishing operation on the inside of the shell 2; in the process of gas escape, the airflow will first flow through the wind whistle 22, and the airflow will drive the wind whistle 22 to vibrate in the process of flowing through the wind whistle 22, thereby producing a whistle sound, reminding external employees that there is an abnormality;

[0064] After the elastic membrane 21 is broken by pressure, the tension spring 24 will reset under the action of elastic potential energy, thereby pulling the knocking block 23 and the fixing frame 25 to collide back and forth. When the knocking block 23 and the fixing frame 25 collide back and forth, a mechanical impact sound will be generated, further reminding the external employees; and in the process of resetting a pair of tension springs 24, when the knocking blocks 23 separate from each other, the plug-in contacts 26 and the circuit-breaking contacts 27 will be separated. When the plug-in contacts 26 and the circuit-breaking contacts 27 are separated, the battery pack in the accidental power-off protection module will be disconnected and no longer supply power, thereby preventing the outflowing water from being electrified and causing injuries to maintenance personnel.

[0065] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0066] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0067] The above shows and describes the basic principles, main features and 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. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A variable frequency power supply for a transformer testing system, characterized in that: It includes a touch panel (1), a PID control module, a voltage detection and regulation control module, a transformer group, a filter module, a protection module, an accidental power failure protection module, a communication module, and an exhaust module; The touch panel (1) adopts a liquid crystal display screen, and the output selection of voltage and frequency is performed through the touch panel (1); The PID control module is adjusted based on the feedback of the output voltage, output frequency and waveform, and then modulated by SPWM technology for feedback control; The filtering module adopts high-frequency SPWM hardware filtering technology, uses a triangular wave as a modulation signal, and performs pulse modulation on the carrier, achieving a low response time and a stable output under high-frequency switching; The protection module includes a thermistor, a fuse, a circuit breaker, and a leakage protection switch to provide all-round protection for the power supply; The voltage detection and regulation control module adopts IGBT hardware drive, and its control system has parameter memory function. Its regulation system is directly connected to the motor of the transformer, and the size of the transformer output voltage is adjusted by adjusting the frequency; The accidental power failure protection module includes a battery pack, which is used to ignite the capacitor in case of sudden power failure; The communication module includes a serial port USB and an RS485 interface; The exhaust module is used to ventilate and cool the voltage detection and regulation control module; The exhaust module comprises a mounting frame (4), a driving component (5) is fixed inside the mounting frame (4), a rotating column (6) is fixed at the output end of the driving component (5), the driving component (5) is used to drive the rotating column (6) to rotate, a rotating fan blade (7) is fixed outside the rotating column (6), the mounting frame (4) is connected to a shell (2) via bolts on the outside, a plurality of filter grilles (3) are fixed inside the shell (2) and on a side close to the mounting frame (4), and the touch panel (1) is fixedly connected to the shell (2); A transmission rod (8) is fixed to a side of the rotating column (6) away from the driving assembly (5); a matching ring (9) is fixed to the outside of the transmission rod (8); a connecting ring (10) is fixed to the outside of the matching ring (9); a protective ring (11) is fixed to the outside of the connecting ring (10); the diameter of the inner wall of the protective ring (11) is larger than the outer diameter of the connecting ring (10); and water is placed between the connecting ring (10) and the protective ring (11); A plurality of weight plugs (12) are slidably connected inside the connecting ring (10), and the plurality of weight plugs (12) are distributed in an array. A return spring (13) is fixed between the weight plug (12) and the matching ring (9), and a telescopic rod is installed inside the return spring (13). The two ends of the telescopic rod are respectively fixedly connected to the matching ring (9) and the weight plug (12), and a shifting blade (14) is fixed on the side of the weight plug (12) away from the return spring (13); An extrusion block (15) is slidably connected inside the connecting ring (10) and located on a side of the moving blade (14) close to the matching ring (9), and a liquid storage bag (16) is provided on a side of the extrusion block (15) away from the return spring (13); A separator ring (19) is fixed inside the protective ring (11), the separator ring (19) is made of polyethylene material, a plurality of effervescent tablets (20) are placed between the separator ring (19) and the protective ring (11), and a pair of elastic membranes (21) are fixed on a side of the protective ring (11) close to the drive assembly (5) and between the connecting ring (10) and the separator ring (19).

2. The variable frequency power supply for transformer testing system according to claim 1, characterized in that: The liquid storage capsule (16) is externally connected to a pair of conduits (18), each of which has a one-way valve installed inside. The one-way valves have opposite conduction directions, and an expansion spring (17) is fixed inside the liquid storage capsule (16).

3. The variable frequency power supply for transformer testing system according to claim 1, characterized in that: A plurality of wind whistles (22) are connected and penetrated inside the rotating column (6).

4. The variable frequency power supply for transformer testing system according to claim 1, characterized in that: A plurality of ventilation holes are provided inside the elastic membrane (21) at a side away from the separation ring (19); a pair of fixing frames (25) are fixed to a side of the protective ring (11) close to the drive assembly (5); a tension spring (24) is fixed to a side of the fixing frame (25) close to the elastic membrane (21); a knocking block (23) is fixed to an end of the tension spring (24) away from the fixing frame (25); the knocking block (23) is fixedly connected to the elastic membrane (21); and the tension spring (24) is in a stretched state in an initial state.

5. The variable frequency power supply for transformer testing system according to claim 4, characterized in that: A plug-in contact (26) and a disconnecting contact (27) are respectively fixed on one side of the pair of striking blocks (23) close to each other. The plug-in contact (26) and the disconnecting contact (27) are plugged into each other. The plug-in contact (26) and the disconnecting contact (27) are connected to the signal of the accidental power failure protection module through a line. The plug-in contact (26) and the disconnecting contact (27) are waterproofed.

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