Dehumidification device of high-voltage frequency converter and high-voltage frequency conversion cabinet

Abstract

The invention discloses a dehumidification device of a high-voltage frequency converter and a high-voltage frequency conversion cabinet. The device comprises a dehumidification controller, a first switch, a first relay, a second relay and a dehumidifier. One end of the first switch is connected with a first alternating-current power supply, the other end of the first switch is connected into the first relay coil through the dehumidification controller, and the other end of the first relay coil is connected into the first alternating-current power supply. The dehumidification controller is responsible for monitoring the humidity in the frequency conversion cabinet, and when the humidity exceeds a preset threshold value, the loop where the dehumidification controller is located is automatically switched on. One end of a normally open contact of the first relay is connected with a first alternating current power supply, the other end of the normally open contact is connected into a second relay coil, and the normally open contact is conducted after the first relay coil is electrified to supply power to the second relay coil. And a normally open contact of the second relay is connected in series between the power supply end of the dehumidifier and the external alternating current power supply, and when the contact is switched on, the dehumidifier is electrified to operate, so that the high-voltage frequency conversion cabinet is dehumidified. According to the scheme, the dehumidification effect on the high-voltage frequency converter can be improved.

Description

Technical Field

[0001] This invention relates to the field of environmental control technology, and in particular to a dehumidification device and a high-voltage frequency converter cabinet for a high-voltage frequency converter. Background Technology

[0002] High-voltage frequency converters are a critical component of power systems, and their operating status directly affects the overall stability of the power system. Currently, high-voltage frequency converters are typically installed in dedicated high-voltage frequency converter cabinets. However, high humidity inside these cabinets can easily lead to hazards such as short circuits in components and corrosion of metal parts. This not only weakens the operational stability of the high-voltage frequency converter but can also cause equipment failure and shutdown in severe cases. Reliable dehumidification functions can maintain a suitable humidity environment inside the cabinet, which is an important support for ensuring the long-term safe and stable operation of high-voltage frequency converters.

[0003] However, the dehumidification function of current high-voltage frequency converters is generally operated manually, requiring operators or maintenance personnel to manually activate the dehumidification function, resulting in a low level of automation. This method not only increases the operational burden on personnel but also fails to automatically activate dehumidification when the humidity inside the cabinet exceeds the threshold, making it difficult to effectively guarantee the timeliness and effectiveness of dehumidification. Summary of the Invention

[0004] In view of this, this application provides a dehumidification device and a high-voltage frequency converter cabinet for high-voltage frequency converters, the main purpose of which is to solve the technical problem of low dehumidification effect of high-voltage frequency converters.

[0005] According to a first aspect of the present invention, a dehumidification device for a high-voltage frequency converter is provided for dehumidifying the high-voltage frequency converter in a high-voltage frequency converter cabinet. The device includes a dehumidification controller, a first switch, a first relay, a second relay, and a dehumidifier for dehumidifying the high-voltage frequency converter cabinet. The first terminal of the first switch is connected to the first terminal of the first AC power supply, and the dehumidifier is connected in series between the second terminal of the first switch and the first terminal of the first relay coil of the first relay. The second terminal of the first relay coil is connected to the second terminal of the first AC power supply. The dehumidification controller is used to monitor the humidity value inside the high-voltage frequency converter cabinet, and when the humidity value is greater than a preset humidity threshold, it makes the second terminal of the first switch and the first terminal of the first relay coil of the first relay in a conductive state. The first end of the first normally open contact of the first relay is connected to the first end of the first AC power supply, and the second end of the first normally open contact is connected to the second relay coil of the second relay, so that when the first relay coil is energized and the first normally open contact is turned on, the second relay coil can obtain electrical energy from the first AC power supply. The second normally open contact of the second relay is connected in series between the power supply terminal of the dehumidifier and the external AC power supply, so that when the second normally open contact is turned on, the dehumidifier is powered on and in operation to perform dehumidification operation for the high voltage frequency converter cabinet.

[0006] In an optional embodiment, the dehumidifier is a dehumidifying fan, which is installed at the high-voltage inverter cabinet to reduce the humidity of the air inside the high-voltage inverter cabinet by exchanging the air.

[0007] In an optional embodiment, the device further includes a second switch; the second switch is connected in series between a first terminal of the first AC power supply and a first terminal of the first relay coil, so as to control whether the first relay coil is energized by adjusting the on and off states of the second switch.

[0008] In an optional embodiment, the device further includes a power-off delay relay, a third switch, and a third relay. When the high-voltage frequency converter stops, the third switch is opened. The third relay coil of the power-off delay relay, the third switch, and the third relay is connected between a first terminal of the first AC power supply and a second terminal of the first AC power supply. The third normally open contact of the third relay is connected in series between an external AC power supply and a first terminal of the second normally open contact. The power-off delay relay is used to stop outputting electrical energy to the third relay coil after a preset delay time when the third switch is opened, so as to control the third normally open contact to delay opening.

[0009] In an optional embodiment, the dehumidifier is further configured to send a humidity alarm message to a remote host computer when the humidity value is greater than a preset humidity threshold.

[0010] In an optional embodiment, the dehumidifier includes a humidity sensor, a control unit, and a control switch; the humidity sensor is disposed in the high-voltage frequency converter cabinet and is used to collect the humidity value and send the humidity value to the control unit; the control switch is connected in series between the second terminal of the first switch and the first terminal of the first relay coil; the control unit is used to determine whether the humidity value is greater than the humidity threshold, and when the humidity value is greater than the humidity threshold, the control switch is turned on.

[0011] In an optional embodiment, the control unit has a remote communication terminal for connecting to a remote host computer to establish a communication connection with the host computer.

[0012] In an optional embodiment, the dehumidifier controller further includes a dehumidifier indicator light; the control unit is also configured to control the dehumidifier indicator light to illuminate when the humidity value is greater than the humidity threshold.

[0013] In an optional embodiment, the humidity threshold is 70%.

[0014] According to a second aspect of the present invention, a high-voltage frequency converter cabinet is provided, which includes a dehumidification device for the high-voltage frequency converter as described above.

[0015] This invention provides a dehumidification device and cabinet for a high-voltage frequency converter. The device automatically monitors the humidity inside the cabinet via a dehumidification controller. When the humidity exceeds a threshold, it automatically activates the circuit, energizing the first and second relays sequentially, thereby triggering the dehumidifier to operate. This replaces the traditional manual dehumidification method, significantly reducing the operational burden on personnel. Simultaneously, it can promptly activate the dehumidification function when humidity exceeds the standard, improving the dehumidification effect on the high-voltage frequency converter. This avoids potential hazards such as short circuits and metal corrosion caused by untimely dehumidification, effectively maintaining a suitable humidity environment inside the cabinet, improving the operational stability of the high-voltage frequency converter, reducing the risk of equipment failure and downtime, and ensuring the reliability of the high-voltage frequency converter.

[0016] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This figure shows one of the structural schematic diagrams of a dehumidification device for a high-voltage frequency converter provided in an embodiment of the present invention; Figure 2 This is a second schematic diagram of the structure of a dehumidification device for a high-voltage frequency converter provided in an embodiment of the present invention; Figure 3 This is shown as a third schematic diagram of the structure of a dehumidification device for a high-voltage frequency converter provided in an embodiment of the present invention; Figure 4 The fourth schematic diagram shows the structure of a dehumidification device for a high-voltage frequency converter according to an embodiment of the present invention; Figure 5 A schematic diagram of the power supply circuit for an external AC power supply provided in an embodiment of the present invention is shown; Figure 6The fifth schematic diagram shows the structure of a dehumidification device for a high-voltage frequency converter provided in an embodiment of the present invention. Detailed Implementation

[0018] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0019] Currently, the dehumidification function of high-voltage frequency converters is generally operated manually, requiring operators or maintenance personnel to manually activate the dehumidification process, resulting in a low level of automation. This method not only increases the operational burden on personnel but also fails to automatically activate dehumidification when the humidity inside the cabinet exceeds the threshold, making it difficult to effectively guarantee the timeliness and effectiveness of dehumidification.

[0020] To address the above problems, in one embodiment, such as Figure 1 As shown, a dehumidification device for a high-voltage frequency converter is provided. Taking the use of this device to dehumidify the high-voltage frequency converter in the high-voltage frequency converter cabinet as an example, the device includes a dehumidification controller 100, a first switch S1, a first relay, a second relay, and a dehumidifier 200 for dehumidifying the high-voltage frequency converter cabinet.

[0021] Specifically, the first terminal of the first switch S1 is connected to the first terminal of the first AC power supply AC1, and the dehumidifier controller 100 is connected in series between the second terminal of the first switch S1 and the first terminal of the first relay coil RL1 of the first relay. The second terminal of the first relay coil RL1 is connected to the second terminal of the first AC power supply AC1. The first AC power supply AC1 is used to output 220V AC power through its first and second terminals.

[0022] Here, the dehumidifier controller may include a humidity sensor, a control unit, and a control switch. The control unit may be a computer device such as a microcontroller. Furthermore, the humidity sensor is installed inside the high-voltage frequency converter cabinet to collect the humidity value inside the high-voltage frequency converter cabinet and send the humidity value to the control unit. Furthermore, the control switch is connected in series between the second end of the first switch S1 and the first end of the first relay coil RL1. When the control switch is on, the second end of the first switch S1 and the first end of the first relay coil RL1 are in a conductive state, and when the control switch is off, the second end of the first switch S1 and the first end of the first relay coil RL1 are in a disconnected state.

[0023] Furthermore, the dehumidifier 100 monitors the humidity level inside the high-voltage inverter cabinet. When the humidity level exceeds a preset humidity threshold, it connects the second terminal of the first switch S1 to the first terminal of the first relay coil RL1 of the first relay. The humidity threshold can be set to 70%. Specifically, the control unit within the dehumidifier 100 determines whether the humidity level exceeds the humidity threshold. When the humidity level exceeds the threshold, it activates the control switch and sends a humidity alarm message to a remote host computer. Here, the control unit can have a remote communication terminal to connect to a remote host computer, establishing a communication connection.

[0024] Furthermore, the dehumidification controller also includes a dehumidification indicator light; the control unit can control the dehumidification indicator light to illuminate when the humidity value inside the high-voltage frequency converter cabinet is greater than the humidity threshold, so as to alert nearby operators that the high-voltage frequency converter is in an excessively humid environment.

[0025] Furthermore, the first terminal of the first normally open contact K1 of the first relay is connected to the first terminal of the first AC power supply AC1, and the second terminal of the first normally open contact K1 is connected to the first terminal of the second relay coil RL2 of the second relay. The second terminal of the second relay coil RL2 can be connected to the second terminal of the first AC power supply AC1. When the first relay coil RL1 is energized and the first normally open contact K1 is turned on, the second relay coil RL2 can obtain electrical energy from the first AC power supply AC1.

[0026] Furthermore, the second normally open contact K2 of the second relay is connected in series between the power supply terminal of the dehumidifier 200 and the external AC power supply E1, so that when the second normally open contact K2 is turned on, the dehumidifier 200 can be powered by the external AC power supply E1 and be in operation to perform dehumidification operation for the high-voltage frequency converter cabinet.

[0027] Here, the dehumidifier 200 can be a dehumidifying fan. The dehumidifying fan is installed at the high-voltage frequency converter cabinet. By exchanging the air inside the high-voltage frequency converter cabinet, the humidity of the air inside the high-voltage frequency converter cabinet is reduced, thereby reducing the humidity value of the environment where the high-voltage frequency converter is located. It can also eliminate the residual heat inside the high-voltage frequency converter cabinet, thereby achieving the purpose of preventing condensation.

[0028] In actual operation, the initial state of the first switch S1 can be the ON state, and the initial state of the dehumidifier controller 100 can be the OFF state. When the dehumidifier controller 100 detects that the humidity value is greater than the humidity threshold, it turns on, supplying the electrical energy output from the first AC power supply AC1 to the first relay coil RL1, causing the first normally open contact K1 to conduct. This, in turn, energizes the second relay coil RL2, causing the second normally open contact K2 to conduct, allowing the electrical energy output from the external AC power supply E1 to be supplied to the dehumidifier 200 via the second normally open contact K2, thus enabling the dehumidifier 200 to begin dehumidification. Furthermore, when the dehumidifier controller 100 detects that the humidity value is lower than the humidity threshold, it can be in the OFF state, causing the dehumidifier 200 to stop dehumidifying.

[0029] Furthermore, the high-voltage frequency converter cabinet may include a transformer cabinet and a unit cabinet, and each of the transformer cabinet and unit cabinet may be equipped with a dehumidifier 200 to dehumidify the transformer cabinet and unit cabinet respectively. Figure 2 As shown, the dehumidification devices in the transformer cabinet and the unit cabinet can be a first dehumidification device 210 and a second dehumidification device 220, respectively, and the second relay can include a transformer cabinet relay and a unit cabinet relay.

[0030] Furthermore, the first sub-relay coil RL21 of the transformer cabinet relay can be connected to the second end of the first normally open contact K1. The first sub-contact K21 of the transformer cabinet relay can be connected in series between the external AC power supply E1 and the power supply terminal of the first dehumidifier 210, so as to supply power to the first dehumidifier 210 through the first sub-contact K21. Furthermore, the second sub-relay coil RL22 of the unit cabinet relay can be connected to the second end of the first normally open contact K1. The second sub-contact K22 of the unit cabinet relay can be connected in series between the external AC power supply E1 and the power supply terminal of the second dehumidifier 220, so as to supply power to the second dehumidifier 220 through the second sub-contact K22, thereby realizing the dehumidification of the transformer cabinet and the unit cabinet.

[0031] The dehumidification device for the high-voltage frequency converter provided in this embodiment can automatically monitor the humidity inside the high-voltage frequency converter cabinet through the dehumidification controller. When the humidity exceeds the threshold, the circuit can be automatically activated to energize the first and second relays in sequence, thereby triggering the dehumidification device to operate. This replaces the traditional manual dehumidification method, greatly reducing the burden on personnel. At the same time, it can start dehumidification in time when the humidity exceeds the standard, avoiding the hidden dangers of short circuits and metal corrosion of internal components due to untimely dehumidification. It effectively maintains a suitable humidity environment inside the cabinet, improves the operational stability of the high-voltage frequency converter, reduces the risk of equipment failure and downtime, and ensures the reliability of the high-voltage frequency converter.

[0032] In an optional embodiment, such as Figure 3As shown, the device also includes a second switch S2. Specifically, the second switch S2 is connected in series between the first terminal of the first AC power supply AC1 and the first terminal of the first relay coil RL1, so as to control whether the first relay coil RL1 is energized by adjusting the on and off state of the second switch S2. Here, the second switch S2 can be used as a manual control switch for the dehumidifier 200 to manually control whether the dehumidifier 200 is energized and operated. The embodiment provided in this application, by adding a second switch, can realize flexible switching between automatic control and manual control of the dehumidifier. It retains the function of automatically starting dehumidification when the humidity exceeds the threshold, and can also directly control the on and off state of the first relay coil by manually operating the second switch, meeting the needs of special scenarios such as emergency start / stop and equipment debugging, and improving the flexibility and reliability of the device operation.

[0033] In an optional embodiment, such as Figure 4 As shown, the device also includes a power-off delay relay 300, a third switch S3, and a third relay; here, the third switch S3 can be linked with the high-voltage frequency converter. When the high-voltage frequency converter is running, the control unit of the high-voltage frequency converter controls the third switch S3 to be turned on; when the high-voltage frequency converter stops, the control unit of the high-voltage frequency converter controls the third switch S3 to be turned off. Here, the power-off delay relay 300 can be a Siemens 3RP25 type time relay.

[0034] Specifically, the first end of the third switch S3 is connected to the first end of the first AC power supply AC1, and the second end of the third switch S3 is connected to the control signal port B1 of the power-off delay relay 300. Furthermore, the control power port A1 of the time delay relay 300 is connected to the first terminal of the first AC power supply AC1, the first contact terminal 15 of the time delay normally open contact of the time delay relay 300 is connected to the first terminal of the first AC power supply AC1, the second contact terminal 18 of the time delay normally open contact is connected to the first terminal of the third relay coil RL3 of the third relay, and the second terminal of the third relay coil RL3 is connected to the second terminal of the first AC power supply AC1; furthermore, the third normally open contact K3 of the third relay is connected in series between the power output terminal of the external AC power supply E1 and the first terminal of the second normally open contact K2.

[0035] Furthermore, when the control signal port B1 of the time delay relay 300 is energized, the normally open contact of the time delay action is turned on. Conversely, when the control signal port B1 of the time delay relay 300 is de-energized, after a preset delay time, the normally open contact of the time delay action opens, disconnecting the first contact 15 and the second contact 18, thereby de-energizing the third relay coil RL3 and causing the third normally open contact K3 to open. The preset delay time can be 4 hours, and its specific length can be determined according to actual conditions. Specifically, after the third switch S3 is opened, the time delay relay 300 starts timing. After the preset delay time, the second contact 18 of the time delay relay 300 stops outputting electrical energy, causing the third relay coil RL3 to de-energize and the third normally open contact K3 to open, thus stopping the dehumidifier 200 from operating.

[0036] The embodiments provided in this application enable the dehumidification device to continue operating for a specific period of time after the high-voltage frequency converter is shut down, thereby dissipating residual heat inside the cabinet and preventing condensation.

[0037] Furthermore, such as Figure 5 As shown, the external AC power supply E1 can be powered by two three-phase 380V AC power supplies, namely the second AC power supply AC2 and the third AC power supply AC3. Furthermore, the second AC power supply AC2 provides power to the external AC power supply E1 via the third sub-contact K71 of the seventh relay, and the third AC power supply AC3 provides power to the external AC power supply E1 via the fourth sub-contact K81 of the eighth relay.

[0038] Furthermore, the circuit between the second AC power supply AC2 and the third sub-contact K71 is connected to the sixth relay coil RL6 of the sixth relay, and the circuit between the third AC power supply AC3 and the fourth sub-contact K81 is connected to the fifth sub-contact K61 of the sixth relay and the fifth relay coil RL5 of the fifth relay, forming a series connection between the fifth sub-contact K61 and the fifth relay coil RL5. In actual operation, the second AC power supply AC2 and the third AC power supply AC3 can supply power simultaneously.

[0039] Furthermore, such as Figure 6As shown, a first power control circuit and a second power control circuit can be connected in parallel between the first and second terminals of the first AC power supply AC1. The first power control circuit includes a sixth sub-contact K62 of a sixth relay, a seventh sub-contact K82 of an eighth relay, and a seventh relay coil RL7 of a seventh relay, all connected in series. The second power control circuit includes a fifth relay contact K5 of a fifth relay, an eighth sub-contact K72 of a seventh relay, and an eighth relay coil RL8 of an eighth relay, all connected in series. Here, the third sub-contact K71, the fourth sub-contact K81, the sixth sub-contact K62, and the fifth relay contact K5 are normally open contacts, while the fifth sub-contact K61, the seventh sub-contact K82, and the eighth sub-contact K72 are normally closed contacts.

[0040] Furthermore, when the seventh relay coil RL7 of the seventh relay is energized, the eighth sub-contact K72 is open and the third sub-contact K71 is closed; when the seventh relay coil RL7 is de-energized, the eighth sub-contact K72 is closed and the third sub-contact K71 is open. Furthermore, when the eighth relay coil RL8 of the eighth relay is energized, the seventh sub-contact K82 is open and the fourth sub-contact K81 is closed; when the eighth relay coil RL8 is de-energized, the seventh sub-contact K82 is closed and the fourth sub-contact K81 is open. Furthermore, when the fifth relay coil RL5 is energized, the fifth relay contact K5 is closed; when the fifth relay coil RL5 is de-energized, the fifth relay contact K5 is open. Furthermore, when the sixth relay coil RL6 is energized, the fifth sub-contact K61 is open and the sixth sub-contact K62 is closed; when the sixth relay coil RL6 is de-energized, the fifth sub-contact K61 is closed and the sixth sub-contact K62 is open.

[0041] In actual operation, when the second AC power supply AC2 is working normally, the sixth relay coil RL6 is energized by the second AC power supply AC2, causing the fifth sub-contact K61 to open and the sixth sub-contact K62 to close, thereby de-energizing the fifth relay coil RL5 and causing the fifth relay contact K5 to open; furthermore, because the fifth relay contact K5 is open, the eighth relay coil RL8 is de-energized, the seventh sub-contact K82 closes, thereby energizing the seventh relay coil RL7 and causing the third sub-contact K71 to close, so that the external AC power supply E1 can obtain power from the second AC power supply AC2 to power the dehumidifier 200.

[0042] Furthermore, when the second AC power supply AC2 fails, the sixth relay coil RL6 is de-energized, causing the fifth sub-contact K61 to conduct and the sixth sub-contact K62 to open, thereby energizing the fifth relay coil RL5. The seventh relay coil RL7 is de-energized, causing the fifth relay contact K5 and the eighth sub-contact K72 to conduct. Furthermore, because the fifth relay contact K5 and the eighth sub-contact K72 are conducting, the eighth relay coil RL8 is energized, causing the fourth sub-contact K81 to conduct. The external AC power supply E1 can obtain power from the third AC power supply AC3 to power the dehumidifier 200.

[0043] Based on the above circuit configuration, the second AC power supply AC2 and the third AC power supply AC3 can not supply power to the dehumidifier 200 at the same time. When one AC power supply fails and loses power, power can be obtained from the other AC power supply to supply power to the dehumidifier 200.

[0044] On the other hand, embodiments of this application also provide a high-voltage frequency converter cabinet, which includes a dehumidification device for the high-voltage frequency converter as described above.

[0045] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A dehumidification device for a high-voltage frequency converter, used for dehumidifying the high-voltage frequency converter inside a high-voltage frequency converter cabinet, characterized in that, The device includes a dehumidification controller, a first switch, a first relay, a second relay, and a dehumidifier for dehumidifying the high-voltage frequency converter cabinet. The first terminal of the first switch is connected to the first terminal of the first AC power supply, and the dehumidifier is connected in series between the second terminal of the first switch and the first terminal of the first relay coil of the first relay. The second terminal of the first relay coil is connected to the second terminal of the first AC power supply. The dehumidification controller is used to monitor the humidity value inside the high-voltage frequency converter cabinet, and when the humidity value is greater than a preset humidity threshold, it makes the second terminal of the first switch and the first terminal of the first relay coil of the first relay in a conductive state. The first end of the first normally open contact of the first relay is connected to the first end of the first AC power supply, and the second end of the first normally open contact is connected to the second relay coil of the second relay, so that when the first relay coil is energized and the first normally open contact is turned on, the second relay coil can obtain electrical energy from the first AC power supply. The second normally open contact of the second relay is connected in series between the power supply terminal of the dehumidifier and the external AC power supply, so that when the second normally open contact is turned on, the dehumidifier is powered on and in operation to perform dehumidification operation for the high voltage frequency converter cabinet.

2. The dehumidification device for a high-voltage frequency converter according to claim 1, characterized in that, The dehumidifier is a dehumidifying fan, which is installed at the high-voltage frequency converter cabinet. It reduces the humidity of the air inside the high-voltage frequency converter cabinet by exchanging the air.

3. The dehumidification device for a high-voltage frequency converter according to claim 1, characterized in that, The device also includes a second switch; The second switch is connected in series between the first end of the first AC power supply and the first end of the first relay coil, so as to control whether the first relay coil is energized by adjusting the on and off state of the second switch.

4. The dehumidification device for a high-voltage frequency converter according to claim 1, characterized in that, The device also includes a power-off delay relay, a third switch, and a third relay that disconnects when the high-voltage frequency converter stops. The power-off delay relay, the third switch, and the third relay coil of the third relay are connected between the first terminal of the first AC power supply and the second terminal of the first AC power supply. The third normally open contact of the third relay is connected in series between the external AC power supply and the first end of the second normally open contact; The power-off delay relay is used to stop outputting electrical energy to the third relay coil after a preset delay time when the third switch is turned off, so as to control the third normally open contact to delay opening.

5. The dehumidification device for a high-voltage frequency converter according to claim 1, characterized in that, The dehumidifier controller is also used to send a humidity alarm message to a remote host computer when the humidity value is greater than a preset humidity threshold.

6. The dehumidification device for a high-voltage frequency converter according to claim 1, characterized in that, The dehumidifier controller includes a humidity sensor, a control unit, and a control switch; The humidity sensor is installed inside the high-voltage frequency converter cabinet to collect the humidity value and send the humidity value to the control unit; The control switch is connected in series between the second end of the first switch and the first end of the first relay coil; The control unit is used to determine whether the humidity value is greater than the humidity threshold, and when the humidity value is greater than the humidity threshold, the control switch is turned on.

7. The dehumidification device for a high-voltage frequency converter according to claim 6, characterized in that, The control unit has a remote communication terminal for connecting to a remote host computer to establish a communication connection with the host computer.

8. The dehumidification device for a high-voltage frequency converter according to claim 6, characterized in that, The dehumidification controller also includes a dehumidification indicator light; The control unit is also used to control the dehumidification indicator light to illuminate when the humidity value is greater than the humidity threshold.

9. The dehumidification device for a high-voltage frequency converter according to claim 1, characterized in that, The humidity threshold is 70%.

10. A high-voltage frequency converter cabinet, characterized in that, The high-voltage frequency converter cabinet includes a dehumidification device for the high-voltage frequency converter as described in any one of claims 1 to 9.

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