How to Eliminate the Condensation Phenomenon of Box Transformer Shell

How to Eliminate the Condensation Phenomenon of Box Transformer Shell

The Formation and Harm of Condensation Phenomenon on on the Shell of Box Transformer

1. Without good ventilation and heating conditions, the casing of the box transformer cannot form effective air circulation. Water and gas collect into the low-voltage chamber of the box transformer through small holes and unsealed cable holes at the bottom of the casing, and cannot be discharged. When the external temperature is lower than the internal temperature, condensation will form on the wall of the box transformer.

2. External environmental factors: When the cold and warm air intersects and rains in spring and autumn, the humidity in the air increases, and condensation is also prone to occur. Or in coastal areas, due to geographical environmental factors, the high humidity in the air makes the outdoor box transformer casing susceptible to moisture and condensation.

When the condensation phenomenon of the box transformer casing reaches a certain level, water droplets will form on the top plate of the low-voltage room, which will corrode the top plate and affect the waterproof ability of the box transformer casing. If the water droplets directly fall on the operating low-voltage switch, they will gradually rust the electrical components, leading to switch failure, short circuit tripping, and other faults, seriously affecting the operating life of the electrical equipment.

Effective Method to Eliminate Condensation Phenomenon on on the Case of Box Transformer

1. Strengthen natural ventilation

The foundation of the box transformer casing can be improved to ensure a height of half a meter above the foundation. Under the condition of ensuring the bearing capacity of the foundation, ventilation louvers are installed on both sides of the cable layer to enhance air convection and reduce the humidity inside the cable layer.

2. Add heating dehumidifier

Manual or automatic mode heaters can be used, which are more reliable, but require personnel to use them on site. The usage time is difficult to control, the workload is large, and compared to automatic mode, it is more power consuming; The maintenance workload of automatic mode is small, but regular maintenance is required. If the internal temperature of the box transformer changes greatly, there is a lot of dust, and the operating environment is poor, it can easily lead to a decrease in the sensitivity of the humidity sensor.

3. Install the exhaust fan

Install two fans in the low-voltage room, one at the bottom for suction and one at the top for exhaust. The fan automatically starts and stops according to the temperature and humidity sensor signal, adjusts the operating temperature in the low-voltage room, improves the equipment operating environment, and prevents the generation of condensation in the low-voltage room.

4. Modify the top of the low-pressure chamber

Change the top plate of the low-voltage chamber of the box transformer casing to a sloping top and install a busbar at the bottom. In this way, even if the heater and fan malfunction to form condensation, water droplets can still be led out along the flow plate under the action of gravity, reducing condensation phenomenon. This measure can also be used under high pressure.

5. Site selection of box transformer casing

When selecting a site, try to avoid rivers, shrubs, and tree shade, and choose an open area to ensure ventilation and sunlight to reduce the local humidity of the box transformer casing. Additionally, strengthen inspections when condensation is prone to occur to ensure the normal operation of the anti condensation device.

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