Dehumidification device for dehumidification in double-fed converter cabinet

Abstract

The utility model belongs to the field of dehumidification devices, particularly relates to a dehumidification device for dehumidification in a doubly-fed converter cabinet, and aims to solve the problems that condensation occurs in a power cabinet after shutdown due to overhigh humidity in the prior art, the electrical insulation performance of devices such as a power unit and a thyristor is finally affected, and faults are caused. The power cabinet comprises a back plate arranged on one side of a converter cabinet body, a heater, a power supply control assembly and a dehumidifier are installed on one side of the back plate, the heater and the dehumidifier are symmetrically distributed and independently work so as to guarantee the dehumidification effect of the whole power cabinet, and an air outlet of the heater is far away from a circuit board. The heater is installed in the reactor cabinet and is close to the thyristor and the IGBT, the heating and dehumidification efficiency is improved, the dehumidifier is installed at the bottom of the control cabinet, moisture is easy to converge downwards, dehumidification can be effectively carried out, the air inlet end of the dehumidifier directly faces the circuit board, and erosion of the moisture to the circuit board can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dehumidification devices, in particular to a dehumidification device for dehumidifying in a double-fed converter cabinet. Background Art

[0002] Hitachi's 1.5MW doubly-fed wind power converter is a commonly used converter in my country's wind turbines and is used all over the country.

[0003] During the use of this converter, some wind farm feedback converters may experience power unit failure after a long shutdown during the rainy season or at night. Our R&D personnel analyzed the recent failures and initially confirmed that excessive humidity caused condensation in the power cabinet after shutdown, which ultimately affected the electrical insulation performance of power units and devices such as thyristors, causing failures.

[0004] In order to reduce the frequency of failures, our company recommends adding a dehumidification device to reduce condensation and reduce the probability of failure. For this purpose, a dehumidification device for dehumidification in the double-fed converter cabinet is proposed. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art that excessive humidity causes condensation in the power cabinet after shutdown, which ultimately affects the electrical insulation performance of power units and devices such as thyristors and causes malfunctions, and to propose a dehumidification device for dehumidifying the cabinet of a doubly-fed converter.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A dehumidification device for dehumidifying in a double-fed converter cabinet comprises a back plate arranged on one side of the converter cabinet, a heater, a power control component and a dehumidifier are respectively installed on one side of the back plate, and the heater and the dehumidifier are symmetrically distributed and work independently to ensure the dehumidification effect of the entire power cabinet;

[0008] The heater is located in the reactor cabinet and close to the thyristor and the IGBT, and is used for heating and dehumidifying the thyristor and the IGBT;

[0009] The dehumidifier is located at the bottom of the control cabinet and on the right side of the UPS. The air inlet of the dehumidifier faces the circuit board to reduce the corrosion of moisture on the circuit board.

[0010] The power control assembly comprises an air switch and a contactor, and both the air switch and the contactor are mounted on guide rails and installed in a control cabinet.

[0011] In a possible design, both sides of the UPS are fixedly connected with clamps, one side of one of the clamps is fixedly connected with a bracket, and the dehumidifier is fixedly connected to one side of the bracket.

[0012] In a possible design, the back plate adopts a convex design to reduce the surface temperature of the communication line.

[0013] In a possible design, a maintenance window is provided on one side of the converter cabinet for manually disconnecting the wiring harness of the heater and dehumidifier from the converter cabinet.

[0014] In a possible design, a humidity controller and a temperature controller are fixedly mounted on one side of the back plate.

[0015] In this application, when in use, the original converter power cabinet side panel is removed, and a new power cabinet side panel is installed. The heater, dehumidifier and power control components are all installed on the back panel, and the back panel is fixed on the power cabinet door panel. The heater and dehumidifier are symmetrically distributed and work independently to ensure the dehumidification effect of the entire power cabinet;

[0016] The heater outlet is far away from the circuit board to avoid high-temperature hot air directly affecting the life of the circuit board. The dehumidifier air inlet is as close as possible to the core components such as IGBT and driver board in the power unit to ensure the maximum dehumidification effect.

[0017] The back panel adopts an outward convex design to keep the heater outlet away from the power unit drive harness. At the same time, a heat-insulating sleeve is added to the harness to prevent the harness from aging faster due to high heat. At the same time, a maintenance window is added to facilitate manual disconnection of the heater and dehumidifier harnesses from the cabinet.

[0018] The heater is installed in the reactor cabinet, close to the thyristor and IGBT to improve the heating and dehumidification efficiency;

[0019] The dehumidifier is installed at the bottom of the control cabinet, on the right side of the UPS. Moisture tends to gather downwards. Installing it at the bottom can effectively dehumidify. The air inlet of the dehumidifier faces the circuit board, which can reduce the erosion of moisture on the circuit board and ensure the normal operation of the control cabinet.

[0020] The power control assembly is mainly composed of circuit breakers and contactors, which are installed on guide rails and in the control cabinet;

[0021] Use a 10mm drill bit to drill a through hole at the bottom of the cabinet near the edge of the cabinet frame, then install the rubber protective ring, pass the dehumidifier drain pipe through the protective ring, and fix the drain pipe along the edge of the cabinet frame with a cable tie.

[0022] In the utility model, the dehumidification device for dehumidifying in the double-fed converter cabinet is provided with a heater, and the heater is installed in the reactor cabinet, and the installation position is close to the thyristor and the IGBT, so as to improve the heating and dehumidification efficiency;

[0023] In the utility model, the dehumidification device for dehumidifying the double-fed converter cabinet is provided with a dehumidifier, and the dehumidifier is installed at the bottom of the control cabinet. Moisture is easily gathered downward, and dehumidification can be effectively performed. The air inlet end of the dehumidifier faces the circuit board, which can reduce the erosion of moisture on the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the main structure of the dehumidification device for dehumidification in a double-fed converter cabinet proposed by the utility model;

[0025] Figure 2 It is a side cross-sectional structural schematic diagram of a dehumidification device for dehumidification in a double-fed converter cabinet proposed by the utility model;

[0026] Figure 3 The utility model provides a schematic diagram of the installation of a dehumidifier for dehumidifying the cabinet of a double-fed converter.

[0027] In the figure: 1. Converter cabinet; 2. Back panel; 3. Maintenance window; 4. Heater; 5. Power control component; 6. Humidity controller; 7. Temperature controller; 8. Dehumidifier; 9. Clamp; 10. Bracket. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] Example 1

[0030] Reference Figure 1-Figure 3 The dehumidification device comprises: a back plate 2 arranged on one side of the converter cabinet 1, a heater 4, a power control component 5 and a dehumidifier 8 are respectively installed on one side of the back plate 2, the heater 4 and the dehumidifier 8 are symmetrically distributed and work independently to ensure the dehumidification effect of the entire power cabinet;

[0031] The heater 4 is located in the reactor cabinet and close to the thyristor and the IGBT, and is used for heating and dehumidifying the thyristor and the IGBT;

[0032] The dehumidifier 8 is located at the bottom of the control cabinet, on the right side of the UPS, and the air inlet of the dehumidifier 8 faces the circuit board to reduce the corrosion of moisture on the circuit board;

[0033] The power control assembly 5 includes an air switch and a contactor, and both the air switch and the contactor are mounted on a guide rail and installed in the control cabinet;

[0034] Both sides of the UPS are fixedly connected with clamps 9, one side of one clamp 9 is fixedly connected with a bracket 10, and the dehumidifier 8 is fixedly connected to one side of the bracket 10;

[0035] In the above technical solution, the back panel 2 is fixed on the door panel of the power cabinet, the heater 4 and the dehumidifier 8 are symmetrically distributed and work independently to ensure the dehumidification effect of the entire power cabinet;

[0036] The air outlet of heater 4 is far away from the circuit board to avoid high-temperature hot air directly affecting the life of the circuit board. The air inlet of dehumidifier 8 is as close as possible to the core components such as IGBT and driver board in the power unit to ensure the maximum dehumidification effect.

[0037] Heater 4 is installed in the reactor cabinet, close to the thyristor and IGBT to improve the heating and dehumidification efficiency;

[0038] The dehumidifier 8 is installed at the bottom of the control cabinet, on the right side of the UPS. Moisture tends to gather downwards. Installing it at the bottom can effectively dehumidify. The air inlet of the dehumidifier 8 faces the circuit board, which can reduce the erosion of moisture on the circuit board and ensure the normal operation of the control cabinet.

[0039] The power control component 5 is mainly composed of an air switch and a contactor, and is installed on a guide rail and in a control cabinet;

[0040] Reduce the probability of power device failure due to humidity and condensation.

[0041] The reactor cabinet and the control cabinet are both located in the converter cabinet 1 , the UPS and the reactor are both important components of the double-fed converter cabinet, and the thyristor and the IGBT are both located in the reactor cabinet.

[0042] The present application can be used in the field of double-fed converter cabinets, and can also be used in other fields applicable to the present application.

[0043] Example 2

[0044] refer to Figure 1-Figure 3 , improved on the basis of Example 1:

[0045] Dehumidification device for dehumidification in double-fed converter cabinet;

[0046] The back plate 2 adopts a convex design to reduce the surface temperature of the communication line;

[0047] A maintenance window 3 is provided on one side of the converter cabinet 1 for manually disconnecting the wiring harness of the heater 4 and the dehumidifier 8 from the converter cabinet 1;

[0048] In the above technical solution, the back panel 2 adopts an outward convex design to keep the air outlet of the heater 4 away from the power unit driving harness. At the same time, a heat insulating sleeve is added to the harness to prevent the aging of the harness from being accelerated due to high heat. At the same time, a maintenance window 3 is added to facilitate manual disconnection of the heater 4 and dehumidifier 8 harnesses from the cabinet.

[0049] refer to Figure 2, a humidity controller 6 and a temperature controller 7 are fixedly mounted on one side of the back plate 2;

[0050] In the above technical solution, the humidity controller 6 and the temperature controller 7 are convenient for quickly controlling the humidity and temperature in the converter cabinet 1 .

[0051] However, as is well known to those skilled in the art, the working principles and wiring methods of the heater 4 and the dehumidifier 8 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. Dehumidification device for dehumidification in double-fed converter cabinet, It is characterized in that include: A back plate (2) is arranged on one side of the converter cabinet (1), and a heater (4), a power control component (5) and a dehumidifier (8) are respectively installed on one side of the back plate (2), and the heater (4) and the dehumidifier (8) are symmetrically distributed and work independently to ensure the dehumidification effect of the entire power cabinet; The heater (4) is located in the reactor cabinet and close to the thyristor and the IGBT, and is used for heating and dehumidifying the thyristor and the IGBT; The dehumidifier (8) is located at the bottom of the control cabinet and on the right side of the UPS, and the air inlet end of the dehumidifier (8) faces the circuit board to reduce the corrosion of moisture on the circuit board; The power supply control component (5) comprises an air switch and a contactor, and the air switch and the contactor are both mounted on guide rails and installed in a control cabinet.

2. The dehumidification device for dehumidifying in a double-fed converter cabinet according to claim 1, It is characterized in that Both sides of the UPS are fixedly connected with clamps (9), one side of one of the clamps (9) is fixedly connected with a bracket (10), and the dehumidifier (8) is fixedly connected to one side of the bracket (10).

3. The dehumidification device for dehumidifying in a double-fed converter cabinet according to claim 1, It is characterized in that The back plate (2) adopts an outward convex design to reduce the surface temperature of the communication line.

4. The dehumidification device for dehumidifying in a double-fed converter cabinet according to claim 1, It is characterized in that A maintenance window (3) is provided on one side of the converter cabinet (1) for manually disconnecting the connection between the wiring harness of the heater (4) and the dehumidifier (8) and the converter cabinet (1).

5. The dehumidification device for dehumidifying in a double-fed converter cabinet according to claim 3, It is characterized in that A humidity controller (6) and a temperature controller (7) are respectively fixedly mounted on one side of the back plate (2).

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