A harmonic suppression device and protection equipment for a voltage transformer

Abstract

This invention relates to the field of harmonic suppression technology for transformers, specifically disclosing a harmonic suppression device and protection equipment for voltage transformers. The device includes a base plate, with a monitoring component at one end of the base plate's surface. A front harmonic suppression resistor component, a middle harmonic suppression resistor component, and a rear harmonic suppression resistor component are sequentially arranged on the surface of the base plate next to the monitoring component. A grounding component is located on one side of the base plate's surface. This invention solves the problems in the prior art, such as the need to further improve the applicable voltage range, the ease with which the harmonic suppression device can burn out due to high heat under certain continuous high-voltage load conditions due to prolonged grounding, and the inability of the heat dissipation structure to adjust its heat dissipation capacity accordingly during operation of some existing harmonic suppression devices, thus affecting the normal operation of the harmonic suppression device.

Description

Technical Field

[0001] This invention relates to the field of transformer harmonic elimination technology, specifically to a harmonic elimination device and protection equipment for voltage transformers. Background Technology

[0002] Electromagnetic voltage transformers in power grids may become oversaturated when the busbar is unloaded or there are few outgoing lines, due to charging during operation or the elimination of ground faults during operation. This can lead to ferroresonant overvoltage, resulting in unstable voltage relative to ground, false grounding indication, and blown PT high-voltage fuses. In severe cases, it can cause the PT to burn out and trigger other accidents. Harmonic suppression devices can be used to protect voltage transformers from harmonics.

[0003] While existing harmonic suppression devices can meet general usage requirements, they have the following shortcomings in practical applications: Firstly, existing harmonic suppression devices typically require specific harmonic suppression resistors for voltage transformers in different voltage ranges, making them incompatible and limiting their applicable voltage range. Secondly, due to prolonged grounding, existing harmonic suppression devices are prone to burnout under certain continuous high-voltage load conditions caused by excessive heat, necessitating appropriate protective measures. Thirdly, some existing harmonic suppression devices experience significant temperature fluctuations during operation, but their heat dissipation structures cannot adjust accordingly, resulting in insufficient heat dissipation and affecting the normal operation of the device. Summary of the Invention

[0004] The purpose of this invention is to provide a harmonic suppression device and protection equipment for voltage transformers to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a harmonic suppression device and protection equipment for a voltage transformer, comprising a base plate, a monitoring component provided at one end of the surface of the base plate, a front harmonic suppression resistor component, a middle harmonic suppression resistor component, and a rear harmonic suppression resistor component sequentially provided on one side of the surface of the base plate located from the monitoring component, a grounding component provided on one side of the surface of the base plate, a front grounding relay component and a rear grounding relay component provided on the surface of the base plate located between the front harmonic suppression resistor component and the middle harmonic suppression resistor component, and between the middle harmonic suppression resistor component and the rear harmonic suppression resistor component, respectively, a cooling component provided at the end of the surface of the base plate away from the monitoring component, and an upper cover component provided on the surface of the base plate;

[0006] The cooling assembly includes an air guide channel disposed on the surface of the base plate, and a semiconductor cooling chip is disposed on the top of the air guide channel;

[0007] The upper cover assembly includes a cover body disposed on the surface of the base plate. A PLC controller is provided on the top surface of the cover body. A liquid storage tank filled with coolant is embedded on one side of the top of the cover body. A hollow heat dissipation plate is embedded on the other side of the top of the cover body. The bottom surface of the heat dissipation plate is in contact with the heat dissipation surface of the semiconductor cooling chip. A conduit is laid on the bottom surface of the heat dissipation plate. A solenoid valve is provided at one end of the conduit near the liquid storage tank. One end of the conduit is connected to the heat dissipation plate, and the other end of the conduit is connected to the liquid storage tank. A copper plate is embedded on the bottom surface of the liquid storage tank, and a balloon is provided on the top surface of the copper plate.

[0008] Preferably, the monitoring component includes a support on the surface of the base plate, and a voltage sensor mounting slot with a groove structure is provided on the top of the support. A voltage sensor is provided in the voltage sensor mounting slot, and the PLC controller is electrically connected to the voltage sensor.

[0009] Preferably, the front harmonic suppression resistor assembly includes a first support of a groove structure fixedly connected to the surface of the base plate, a first resistor is provided in the middle of the first support, and one end of the first resistor is electrically connected to a voltage sensor through a wire; the middle harmonic suppression resistor assembly includes a second support of a groove structure fixedly connected to the surface of the base plate, a second resistor is provided in the middle of the second support; and the rear harmonic suppression resistor assembly includes a third support of a groove structure fixedly connected to the surface of the base plate, a third resistor is provided in the middle of the third support.

[0010] Preferably, the grounding assembly includes a grounding plate fixing seat fixedly connected to the surface of the base plate, and a grounding hub plate is provided on the top of the grounding plate fixing seat. The grounding hub plate is electrically connected to one end of the third resistor through a wire.

[0011] Preferably, the front grounding relay assembly includes a first mounting base, the top of which is provided with a front relay. The first mounting base is fixedly installed between the first bracket and the grounding plate fixing base and is fixedly connected to the surface of the base plate. The two ends of the front relay are electrically connected to the first resistor and the grounding hub respectively through wires. The PLC controller is electrically connected to the front relay.

[0012] Preferably, the rear grounding relay assembly includes a second mounting base, the upper end of which is provided with a rear relay. The second mounting base is fixedly installed between the second bracket and the grounding plate fixing base and is vertically fixedly connected to the upper end surface of the base plate. The two ends of the rear relay are electrically connected to the second resistor and the grounding hub respectively through wires. The PLC controller is electrically connected to the rear relay.

[0013] Preferably, the first connecting component includes a first base, a first relay is provided on the top of the first base, the first base is fixedly installed between the first bracket and the second bracket and is fixedly connected to the surface of the base plate, the two ends of the first relay are electrically connected to the first resistor and the second resistor respectively through wires, and the PLC controller is electrically connected to the first relay.

[0014] Preferably, the second connecting component includes a second base, a second relay is provided on the top of the second base, the second base is fixedly installed between the second bracket and the third bracket and is fixedly connected perpendicularly to the surface of the base plate, the two ends of the second relay are electrically connected to the second resistor and the third resistor respectively through wires, and the PLC controller is electrically connected to the second relay.

[0015] Preferably, the air inlet at the end of the cover away from the monitoring component is embedded with a blower corresponding to the air guide groove, the air outlet at the other end of the cover is embedded with an exhaust fan, the inner top surface of the cover is provided with a temperature sensor, the top surface of the heat dissipation plate is uniformly provided with heat dissipation fins, and the surface of the heat dissipation plate is uniformly provided with heat dissipation holes.

[0016] Preferably, the first resistor, the second resistor, and the third resistor are all fitted with heat dissipation sleeves.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In this invention, a voltage sensor senses the voltage change state, and then a PLC controller controls the required harmonic elimination resistor under the corresponding voltage state to control the on / off state of the front grounding relay assembly, the rear grounding relay assembly, the first connection assembly, and the second connection assembly, thereby realizing the matching combination of resistors and making the entire device more applicable.

[0019] 2. When the first and second resistors are working, the increase in the number of resistors leads to a further increase in the temperature inside the enclosure. When the temperature inside the enclosure rises, the heat dissipation using the exhaust fan, the induced draft fan, and the copper plate is no longer sufficient to meet the heat dissipation needs. At this time, some of the heat is transferred to the coolant through the copper plate, and the coolant absorbs the heat from the copper plate to dissipate heat inside the enclosure, thereby adjusting the heat dissipation capacity according to the dynamic changes in temperature.

[0020] 3. When the first, second, and third resistors are working, the heat generated inside the enclosure increases further. The semiconductor cooling chip is activated, and the external airflow introduced by the exhaust fan cools the airflow as it passes through the semiconductor cooling chip. The cooled airflow flows to the side of the exhaust fan to cool the inside of the enclosure, thereby adjusting the heat dissipation capacity according to the dynamic changes in temperature. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 This is a schematic diagram of a partial cross-sectional structure inside the present invention;

[0024] Figure 4 This is a top view of the structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the cover body of the present invention;

[0026] Figure 6 This is a schematic diagram showing the positional relationship between the conduit and the semiconductor cooling chip of the present invention;

[0027] Figure 7 This is a schematic diagram of the circuit connection structure of the harmonic suppression component in this invention.

[0028] In the diagram: 1. Base plate; 2. Upper cover assembly; 3. Monitoring assembly; 4. Front harmonic suppression resistor assembly; 5. Middle harmonic suppression resistor assembly; 6. Rear harmonic suppression resistor assembly; 7. Front grounding relay assembly; 8. Rear grounding relay assembly; 9. First connection assembly; 10. Second connection assembly; 11. Grounding assembly; 12. Cooling assembly; 13. Exhaust fan; 14. Exhaust fan; 15. Heat sink; 201. Cover; 202. Air inlet; 205. Liquid storage tank; 206. Heat sink plate; 207. Heat sink fin; 208. Conduit; 210. Copper plate; 211. Balloon; 212. Coolant; 21 4. Temperature sensor; 301. Support; 302. Voltage sensor; 401. First bracket; 402. First resistor; 501. Second bracket; 502. Second resistor; 601. Third bracket; 602. Third resistor; 701. First mounting base; 702. Front relay; 801. Second mounting base; 802. Rear relay; 901. First base; 902. First relay; 1001. Second base; 1002. Second relay; 1101. Grounding plate mounting base; 1102. Grounding hub; 1201. Air guide duct; 1202. Semiconductor cooling chip. Detailed Implementation

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] First embodiment:

[0031] Please see Figure 1-4 and Figure 7 The present invention provides a technical solution: a harmonic suppression device and protection equipment for a voltage transformer, comprising a base plate 1, a monitoring component 3 provided at one end of the surface of the base plate 1, a front harmonic suppression resistor component 4, a middle harmonic suppression resistor component 5 and a rear harmonic suppression resistor component 6 sequentially provided on the surface of the base plate 1 on one side of the monitoring component 3, a grounding component 11 provided on one side of the surface of the base plate 1, a front grounding relay component 7 and a rear grounding relay component 8 provided on the surface of the base plate 1 between the front harmonic suppression resistor component 4 and the middle harmonic suppression resistor component 5 and between the middle harmonic suppression resistor component 5 and the rear harmonic suppression resistor component 6 respectively, a cooling component 12 provided at the end of the surface of the base plate 1 away from the monitoring component 3, and an upper cover component 2 covering the surface of the base plate 1.

[0032] Among them, the base plate 1 provides a fixed support for other components, the upper cover assembly 2 provides a safety protection for other components, the front harmonic suppression resistor assembly 4, the middle harmonic suppression resistor assembly 5 and the rear harmonic suppression resistor assembly 6 achieve harmonic suppression functions with different application ranges through different connection combinations, the front grounding relay assembly 7 controls the connection between the front harmonic suppression resistor assembly 4 and the grounding assembly 11, the rear grounding relay assembly 8 controls the connection between the middle harmonic suppression resistor assembly 5 and the grounding assembly 11, the first connecting assembly 9 controls the connection between the front harmonic suppression resistor assembly 4 and the middle harmonic suppression resistor assembly 5, the second connecting assembly 10 controls the connection between the middle harmonic suppression resistor assembly 5 and the rear harmonic suppression assembly 6, and the grounding assembly 11 is connected to the grounding wire to provide protection and prevent personal injury caused by the transformer being damaged by breakdown.

[0033] The cooling assembly 12 includes an air guide 1201 disposed on the surface of the base plate 1.

[0034] The upper cover assembly 2 includes a cover 201 disposed on the surface of the base plate 1. A PLC controller is provided on the top surface of the cover 201. By programming the PLC controller, it can control the corresponding front relay 702, rear relay 802, first relay 902, and second relay 1002 to complete the connection control of the first resistor 402, second resistor 502, and third resistor 602 when the voltage sensor 302 detects the corresponding voltage, thereby realizing automatic sensing and protection.

[0035] An air inlet 202 at the end of the cover 201 away from the monitoring component 3 is fitted with an exhaust fan 13 corresponding to the air guide 1201. An exhaust fan 14 is fitted at the air outlet at the other end of the cover 201. The exhaust fan 13 draws in outside air into the cover 201 and blows it to the front harmonic elimination resistor component 4, the middle harmonic elimination resistor component 5 and the rear harmonic elimination resistor component 6 at the end of the cover 201 to cool the heat-generating parts. The air after heat exchange is then transported by the exhaust fan 14 to the outside air of the cover 201.

[0036] The monitoring component 3 includes a support 301 on the surface of the base plate 1, and a voltage sensor mounting slot with a groove structure is provided on the top of the support 301. A voltage sensor 302 is provided in the voltage sensor mounting slot. The PLC controller is electrically connected to the voltage sensor 302. Here, the voltage sensor 302 can detect the magnitude of the input voltage value in real time and send the monitoring information to the PLC controller for subsequent processing.

[0037] The front harmonic suppression resistor assembly 4 includes a first support 401 of a groove structure fixedly connected to the surface of the base plate 1. A first resistor 402 is provided in the middle of the first support 401, and one end of the first resistor 402 is electrically connected to the voltage sensor 302 through a wire. The middle harmonic suppression resistor assembly 5 includes a second support 501 of a groove structure fixedly connected to the surface of the base plate 1. A second resistor 502 is provided in the middle of the second support 501. The rear harmonic suppression resistor assembly 6 includes a third support 601 of a groove structure fixedly connected to the surface of the base plate 1. A third resistor 602 is provided in the middle of the third support 601. The first support 401 provides a fixed support for the first resistor 402. One end of the first resistor 402 is electrically connected to the voltage sensor 302 through a wire. Voltage sensor 302 monitors the voltage value passing through the entire device in real time; the second bracket 501 provides a fixed support relative to the second resistor 502, and the second resistor 502, connected in series with the first resistor 402, can adjust the harmonic elimination range of the entire device; the third bracket 601 provides a fixed support relative to the third resistor 602, and the first resistor 402, second resistor 502, and third resistor 602 can be arranged in three combinations: the first resistor 402 operates alone; the first resistor 402 and second resistor 502 are connected in series; and the first resistor 402, second resistor 502, and third resistor 602 are connected in series, thereby forming a specific working range for the adapting resistors of the entire device, greatly increasing its working range.

[0038] The grounding assembly 11 includes a grounding plate fixing base 1101 fixedly connected to the surface of the base plate 1. The top of the grounding plate fixing base 1101 is provided with a grounding hub 1102. The grounding hub 1102 is electrically connected to one end of the third resistor 602 through a wire. The grounding hub 1102 is connected to the ground wire through a wire, grounding the entire device and playing a protective role for the entire device, preventing personal injury when the first resistor 402, the second resistor 502 and the third resistor 602 are broken down.

[0039] The front grounding relay assembly 7 includes a first mounting base 701, with a front relay 702 mounted on top of the first mounting base 701. The first mounting base 701 is fixedly installed between the first bracket 401 and the grounding plate mounting base 1101 and is fixedly connected to the surface of the base plate 1. The two ends of the front relay 702 are electrically connected to the first resistor 402 and the grounding hub 1102 respectively through wires. The PLC controller is electrically connected to the front relay 702. When the transmitted voltage exceeds the adaptation value of the first resistor 402, the voltage sensor 302 senses the voltage change and uploads it to the PLC controller. After the PLC controller determines that the voltage has increased, it controls the front relay 702 to open and simultaneously controls the first relay 902 to close, so that the first resistor 402 and the second resistor 502 are connected in series to form a new adaptation circuit, which adapts to the corresponding voltage change, so that the entire device performs harmonic elimination operation relative to the changed induced voltage.

[0040] The rear grounding relay assembly 8 includes a second mounting base 801, with a rear relay 802 mounted on its upper end. The second mounting base 801 is fixedly installed between the second bracket 501 and the grounding plate mounting base 1101 and is vertically fixedly connected to the upper surface of the base plate 1. The two ends of the rear relay 802 are electrically connected to the second resistor 502 and the grounding hub plate 1102 respectively via wires. The PLC controller is electrically connected to the rear relay 802. When the transmitted voltage exceeds the matching value of the first resistor 402 and the second resistor 502, the voltage sensor 302 senses the voltage change and uploads it to the PLC controller. After the PLC controller determines that the voltage has increased further, it controls the front relay 702 and the rear relay 802 to open, and simultaneously controls the first relay 902 and the second relay 1002 to close, so that the first resistor 402, the second resistor 502 and the third resistor 602 are connected in series to form a new matching circuit, which adapts to the corresponding voltage change, so that the entire device performs harmonic elimination operation relative to the changed induced voltage.

[0041] The first connecting component 9 includes a first base 901, and a first relay 902 is provided on the top of the first base 901. The first base 901 is fixedly installed between the first bracket 401 and the second bracket 501 and is fixedly connected to the surface of the base plate 1. The two ends of the first relay 902 are electrically connected to the first resistor 402 and the second resistor 502 respectively through wires. The PLC controller is electrically connected to the first relay 902. The first relay 902 plays the role of controlling the series connection and disconnection between the first resistor 402 and the second resistor 502.

[0042] The second connection assembly 10 includes a second base 1001, and a second relay 1002 is provided on the top of the second base 1001. The second base 1001 is fixedly installed between the second bracket 501 and the third bracket 601 and is vertically fixedly connected to the surface of the base plate 1. The two ends of the second relay 1002 are electrically connected to the second resistor 502 and the third resistor 602 respectively through wires. The PLC controller is electrically connected to the second relay 1002. The second relay 1002 plays the role of controlling the series connection and disconnection between the second resistor 502 and the third resistor 602.

[0043] The first resistor 402, the second resistor 502 and the third resistor 602 are all fitted with heat dissipation sleeves 15. The heat dissipation sleeves 15 allow the heat generated by the first resistor 402, the second resistor 502 and the third resistor 602 during operation to be quickly conducted outward, so as to dissipate heat quickly.

[0044] In this embodiment, the voltage sensor 302 is connected in series with the input circuit, and the grounding hub 1102 is connected to the ground wire. The voltage sensor 302 can monitor the voltage value of the input circuit in real time. When a ferroresonant overvoltage occurs, the monitoring result is fed back to the PLC controller through the voltage sensor 302. Then, the PLC controller controls the front relay 702, rear relay 802, first relay 902, and second relay 1002 that match the corresponding voltage values, so that they control the connection between the first resistor 402, the second resistor 502, and the third resistor 602. This allows the entire device to form a corresponding adapter resistor, enabling corresponding harmonic elimination. This allows the device to be used for harmonic elimination in multiple voltage ranges, improving the overall applicability of the device. During this process, if the first resistor 402, the second resistor 502, and the third resistor 602 generate heat due to high voltage, the heat generated will be quickly conducted to the heat dissipation sleeve 15. Then, through the induced draft fan 13 and the exhaust fan 14, a continuous cooling airflow will be formed at both ends of the cover 201, thereby preventing the first resistor 402, the second resistor 502, and the third resistor 602 from overheating and improving the service life of the entire device.

[0045] Second embodiment:

[0046] Please see Figure 5-6 Based on the harmonic suppression device and protection equipment for a voltage transformer provided in the first embodiment, in actual use, especially when expanding the operating range, it is necessary to increase the number of series resistors accordingly, which leads to an increase in heat generation. At this time, it is difficult to achieve heat dissipation inside the enclosure 201 by simply using the exhaust fan 13 and the ventilator 14. The heat dissipation capacity is relatively limited and cannot be dynamically adjusted according to the usage needs to achieve adaptive adjustment of the heat dissipation capacity. This can easily lead to excessively high temperatures and affect normal operation. In order to solve the above problems:

[0047] A semiconductor cooling chip 1202 is provided on the top of the air guide duct 1201.

[0048] A liquid storage tank 205 is embedded on one side of the top of the cover 201. The liquid storage tank 205 is filled with coolant 212. A hollow heat dissipation plate 206 is embedded on the other side of the top of the cover 201. The bottom surface of the heat dissipation plate 206 is in contact with the heat dissipation surface of the semiconductor cooling chip 1202. A conduit 208 is laid on the bottom surface of the heat dissipation plate 206. One end of the conduit 208 is connected to the heat dissipation plate 206. Heat dissipation fins 207 are evenly distributed on the top surface of the heat dissipation plate 206. Heat dissipation holes are evenly opened on the surface of the heat dissipation plate 206. The other end of the conduit 208 is connected to the liquid storage tank 205. A copper plate 210 is embedded on the bottom surface of the liquid storage tank 205. A balloon 211 is placed on the top surface of the copper plate 210. The balloon 211 is a hollow sphere made of rubber and can be filled with air, oxygen or carbon dioxide gas, etc., which are greatly affected by thermal expansion and contraction.

[0049] A temperature sensor 214 is installed on the top surface inside the cover 201.

[0050] A solenoid valve is provided at one end of the conduit 208 near the liquid storage tank 205.

[0051] When the device in this embodiment is in use, the first resistor 402 generates relatively little heat when it works alone, and the temperature sensor 214 senses that the temperature inside the cover 201 is within the first threshold range set by the temperature sensor 214. At this time, the heat inside the cover 201 is discharged by the exhaust fan 13 and the exhaust fan 14 to achieve heat dissipation inside the cover 201. At the same time, the copper plate 210 can also absorb some of the generated heat, and the copper plate 210 is sufficient to absorb this small amount of heat. Moreover, the heat at this time is not enough to be transferred to the coolant 212 in the liquid storage tank 205.

[0052] When the first resistor 402 and the second resistor 502 are connected in series, the temperature inside the cover 201 increases further due to the increase in the number of resistors. When the temperature inside the cover 201 reaches the second threshold range set by the temperature sensor 214, the heat dissipation by the exhaust fan 13, the exhaust fan 14 and the copper plate 210 can no longer meet the heat dissipation requirements. At this time, some heat is transferred to the coolant 212 through the copper plate 210. The coolant 212 absorbs some of the heat, and the coolant 212 is sufficient to absorb this part of the heat to achieve the purpose of heat dissipation. Moreover, the heat absorbed by the coolant 212 is not enough to cause the balloon 211 to expand.

[0053] When the first resistor 402, the second resistor 502, and the third resistor 602 are connected in series, the number of resistors increases further, and the heat generated inside the cover 201 increases further. When the temperature sensor 214 detects that the temperature inside the cover 201 has reached the third threshold range set by the temperature sensor 214, the semiconductor cooling chip 1202 starts working, and the solenoid valve opens at the same time. At this time, the heat transferred to the coolant 212 increases further, and the temperature of the coolant 212 causes the balloon 211 to expand due to heat, increasing its volume. This, in turn, compresses the coolant 212 in the reservoir 205 through the conduit 208 and the semiconductor cooling chip. The thermoelectric cooler 1202 enters the heat sink 206. When the coolant 212 passes through the thermoelectric cooler 1202, it cools down. Since the other side of the thermoelectric cooler 1202 generates heat when it is working, and the bottom surface of the heat sink 206 is in contact with the surface of the thermoelectric cooler 1202, the cooled coolant 212 can cool down the heat dissipation surface of the thermoelectric cooler 1202 after entering the heat sink 206. At the same time, the heat sink 207 can absorb some of the heat in the heat sink 206, and the heat dissipation holes on the top surface of the heat sink 206 can also dissipate some heat.

[0054] It should be noted that the amount of coolant 212 in the reservoir 205 that is pressurized into the heat sink 206 is insufficient to fill the internal space of the heat sink 206. Therefore, the coolant 212 will not overflow from the heat dissipation holes on the top surface of the heat sink 206. When the temperature inside the cover 201 reaches the third threshold range set by the temperature sensor 214, the solenoid valve opens. When the temperature sensor 214 detects that the temperature inside the cover 201 is within the second threshold range set by the temperature sensor 214, the valve closes.

[0055] Furthermore, when the thermoelectric cooler 1202 is working, since the cooling surface faces downwards and towards the interior of the air guide duct 1201, the external airflow introduced by the exhaust fan 13 cools the airflow as it passes through the thermoelectric cooler 1202. As the cooled airflow flows towards the exhaust fan 14, it cools and dissipates heat from the first resistor 402, the second resistor 502, and the third resistor 602, thereby effectively reducing the temperature inside the enclosure 201. Simultaneously, it cools the copper plate 210, thereby reducing the temperature of the coolant 212 in the liquid storage tank 205. When the temperature sensor 214 detects… When the temperature inside the cover 201 is lower than the lowest temperature in the third threshold range set by the temperature sensor 214, the solenoid valve is not yet closed, the thermoelectric cooler 1202 is closed, the balloon 211 retracts and resets, and at the same time, the coolant 212 in the heat sink plate 206 flows back to the storage tank 205 through the conduit 208 and the thermoelectric cooler 1202. When passing through the thermoelectric cooler 1202, the low temperature remaining at the cooling end of the thermoelectric cooler 1202 is used to cool the passing coolant 212, thereby cooling the coolant 212 in the storage tank 205 and improving the heat dissipation capacity.

[0056] In summary, when the number of resistors in the harmonic suppression resistor changes, the heat generated also changes, which in turn causes the temperature inside the cover 201 to change dynamically. Therefore, the heat dissipation capacity can be adjusted according to the dynamic temperature change inside the cover 201 using the second embodiment described above, effectively preventing the temperature inside the cover 201 and its internal components from becoming too high and affecting normal operation.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A harmonic suppression device and protection equipment for a voltage transformer, characterized in that: The device includes a base plate. A monitoring component is provided at one end of the surface of the base plate. A front harmonic suppression resistor component, a middle harmonic suppression resistor component, and a rear harmonic suppression resistor component are sequentially provided on one side of the surface of the base plate. A grounding component is provided on one side of the surface of the base plate. A front grounding relay component is provided on the surface of the base plate between the front harmonic suppression resistor component and the grounding component. A rear grounding relay component is provided on the surface of the base plate between the front harmonic suppression resistor component and the middle harmonic suppression resistor component, and between the middle harmonic suppression resistor component and the rear harmonic suppression resistor component. A cooling component is provided at the end of the surface of the base plate away from the monitoring component. An upper cover component is provided on the surface of the base plate. The cooling assembly includes an air guide channel disposed on the surface of the base plate, and a semiconductor cooling chip is disposed on the top of the air guide channel; The upper cover assembly includes a cover body disposed on the surface of the base plate. A PLC controller is provided on the top surface of the cover body. A liquid storage tank filled with coolant is embedded on one side of the top of the cover body. A hollow heat dissipation plate is embedded on the other side of the top of the cover body. The bottom surface of the heat dissipation plate is in contact with the heat dissipation surface of the semiconductor cooling chip. A conduit is laid on the bottom surface of the heat dissipation plate. A solenoid valve is provided at one end of the conduit near the liquid storage tank. One end of the conduit is connected to the heat dissipation plate, and the other end of the conduit is connected to the liquid storage tank. A copper plate is embedded on the bottom surface of the liquid storage tank, and a balloon is provided on the top surface of the copper plate. By monitoring the components, the PLC controller controls the switching on and off of the front grounding relay component, the rear grounding relay component, the first connection component, and the second connection component, thereby achieving the appropriate combination of resistors.

2. The harmonic suppression device and protection equipment for a voltage transformer according to claim 1, characterized in that: The monitoring component includes a support on the surface of the base plate, and a voltage sensor mounting slot with a groove structure is provided on the top of the support. A voltage sensor is installed in the voltage sensor mounting slot, and the PLC controller is electrically connected to the voltage sensor.

3. The harmonic suppression device and protection equipment for a voltage transformer according to claim 2, characterized in that: The front harmonic suppression resistor assembly includes a first support of a groove structure fixedly connected to the surface of the base plate, with a first resistor in the middle of the first support and one end of the first resistor electrically connected to a voltage sensor via a wire. The middle harmonic suppression resistor assembly includes a second support of a groove structure fixedly connected to the surface of the base plate, with a second resistor in the middle of the second support. The rear harmonic suppression resistor assembly includes a third support of a groove structure fixedly connected to the surface of the base plate, with a third resistor in the middle of the third support.

4. The harmonic suppression device and protection equipment for a voltage transformer according to claim 3, characterized in that: The grounding assembly includes a grounding plate fixing seat fixedly connected to the surface of the base plate. The top of the grounding plate fixing seat is provided with a grounding hub plate. The grounding hub plate is electrically connected to one end of the third resistor through a wire.

5. The harmonic suppression device and protection equipment for a voltage transformer according to claim 4, characterized in that: The front grounding relay assembly includes a first mounting base, with a front relay on the top of the first mounting base. The first mounting base is fixedly installed between the first bracket and the grounding plate fixing base and is fixedly connected to the surface of the base plate. The two ends of the front relay are electrically connected to the first resistor and the grounding hub respectively through wires. The PLC controller is electrically connected to the front relay.

6. The harmonic suppression device and protection equipment for a voltage transformer according to claim 4, characterized in that: The rear grounding relay assembly includes a second mounting base, with a rear relay at the upper end of the second mounting base. The second mounting base is fixedly installed between the second bracket and the grounding plate fixing base and is vertically fixedly connected to the upper end surface of the base plate. The two ends of the rear relay are electrically connected to the second resistor and the grounding hub plate respectively through wires. The PLC controller is electrically connected to the rear relay.

7. A harmonic suppression device and protection equipment for a voltage transformer according to claim 3, characterized in that: The first connection component includes a first base, a first relay is provided on the top of the first base, the first base is fixedly installed between the first bracket and the second bracket and is fixedly connected to the surface of the base plate, the two ends of the first relay are electrically connected to the first resistor and the second resistor respectively through wires, and the PLC controller is electrically connected to the first relay.

8. The harmonic suppression device and protection equipment for a voltage transformer according to claim 3, characterized in that: The second connection assembly includes a second base, a second relay is provided on the top of the second base, the second base is fixedly installed between the second bracket and the third bracket and is fixedly connected perpendicularly to the surface of the base plate, the two ends of the second relay are electrically connected to the second resistor and the third resistor respectively through wires, and the PLC controller is electrically connected to the second relay.

9. The harmonic suppression device and protection equipment for a voltage transformer according to claim 1, characterized in that: An air inlet at the end of the cover away from the monitoring component is fitted with an exhaust fan corresponding to the air guide groove. An exhaust fan is fitted at the air outlet at the other end of the cover. A temperature sensor is provided on the top surface of the cover. Heat sinks are evenly distributed on the top surface of the heat dissipation plate. Heat dissipation holes are evenly distributed on the surface of the heat dissipation plate.

10. A harmonic suppression device and protection equipment for a voltage transformer according to claim 3, characterized in that: The first resistor, the second resistor, and the third resistor are all fitted with heat dissipation sleeves.

Images