Low-dew-point positive pressure air supply system and dehumidification method for high-voltage cabinet

Abstract

The invention relates to a low dew point positive pressure air supply system for a high-pressure cabinet and a dehumidification method thereof. The cooler for the temperature of the external air delivered from the outside; when the temperature of the external air is higher than 18-20°C, the cooler is started, and the external air is filtered by the filter part, and then processed by a compression cooler to reduce the air temperature to 14°C -16°C, and then sent to the rotary dehumidifier for dehumidification; the rotary dehumidifier will continuously absorb the water molecules in the high-pressure cabinet and convert it into humid air, discharge it out of the high-pressure cabinet in the high-pressure chamber, and transport the dry air after heating and dehumidification To the high-voltage cabinet to achieve the purpose of continuous dehumidification of the high-voltage cabinet. The present invention completely reduces the moisture content of the air in the cabinet, thereby reducing the air humidity and dew point temperature in the cabinet, thereby avoiding the occurrence of condensation, ensuring that the air pressure in the cabinet is positive relative to the outside of the cabinet and that there is no dead angle in the high-voltage cabinet.

Description

technical field [0001] The invention relates to the field of a dehumidification method for a high-voltage electrical cabinet and an exhaust system thereof, in particular to a low dew point positive pressure air supply system for a high-voltage cabinet and a dehumidification method thereof. Background technique [0002] At this stage, there are many ways to dehumidify high-voltage electrical cabinets. There are dehumidifiers installed in the high-voltage room, traditional heating and dehumidification devices in the cabinet, and semiconductor dehumidifiers, but the effect is not obvious, because simply relying on the external environment of the high-voltage cabinet Install dehumidification in the high-voltage chamber, or place a heater in the high-voltage cabinet, or use special thermoelectric semiconductor materials to manufacture semiconductor refrigeration devices for dehumidification according to the Peltier effect. Facts have proved that the above methods cannot effectivel...

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Problems solved by technology

[0002] At this stage, there are many ways to dehumidify high-voltage electrical cabinets. There are dehumidifiers installed in the high-voltage room, traditional heating and dehumidification devices in the cabinet, and semiconductor dehumidifiers, but the effect is not obvious, because simply relying on the external environment of the high-voltage cabinet Install dehumidification in the high-voltage chamber, or place a heater in the high-voltage cabinet, or use special thermoelectric semiconductor materials to manufacture semiconductor refrigeration devices for dehumidification according to the Peltier effect. Facts have proved that the above methods cannot effectively prevent humidity in the high-voltage cabinet. overgas, forming condensation

[0003] To solve the problem of high humidity and condensation in the switchgear, only a large amount of water vapor in the air in the switchgear can be discharged out of the switchgear, and the operating equipment in the switchgear can be kept in a relatively stable environment. To solve this problem fundamentally, there is an urgent need for a dehumidification system and method that can discharge a large amount of water vapor in the high-voltage cabinet, so as to avoid the reduction of the insulation strength of the equipment in the cabinet, especially the busbar, caused by condensation in the high-voltage cabinet. In order to avoid the occurrence of flashover on the surface of the insulating part or the explosion of the switch, and seriously affect its safe and stable operation

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