What are the ventilation methods for the main transformer room of the box transformer casing?

What are the ventilation methods for the main transformer room of the box transformer casing?

With the increasing demand for power supply, the ventilation problem in the main transformer room of the box transformer casing has also become prominent, especially when the transformer trips due to faults during high temperature and high load operation in summer. Therefore, solving the problem of poor heat dissipation reasonably to ensure the efficient operation of transformers has become one of the key research issues in the industry.

So, what are the ventilation methods for the main transformer room of the box transformer casing?

There are two sources of heat in the main transformer chamber of the box transformer casing: 1. The heat generated during the operation of components such as transformers and compensation capacitors; 2. The heat transmitted by solar radiation into the interior of the box. Polyurethane foam insulation material, due to its low material density, insulation and waterproofing, and extremely low thermal conductivity, can effectively block the solar radiation heat during hot weather. It is used as an excellent molding material for metal and non-metal box bodies. However, it should be noted that this strong insulation ability prevents the heat generated by the box transformer during operation from dissipating outdoors in a timely manner, which is unfavorable for ventilation and heat dissipation. The contradiction between the inability of external heat to enter and internal heat to dissipate has also become one of the technical difficulties in ventilation of the main transformer room of the box transformer casing.

There are two main types of poor ventilation problems in the main transformer room of the box transformer casing:

1. When the ventilation volume is insufficient and the load rate is high, due to the small air inlet, the amount of air entering the room is too small, which cannot provide timely ventilation, cooling, and cooling;

2. Unreasonable airflow organization: Due to the unscientific layout of the air inlet and outlet, a large number of flow dead corners are formed indoors, affecting the smooth discharge of indoor heat, and even causing backflow and backflow. The air inlet changes to an air outlet or an air outlet changes to an air inlet, which not only fails to provide heat dissipation and ventilation, but also increases safety hazards.

The ventilation method for the main transformer room of the box transformer casing can adopt forced ventilation, and the available equipment includes axial flow fans and width fans. The indoor air flow is strengthened and the temperature is reduced. Generally, louvers with different numbers and length to width ratios are installed at different positions on the doors of the high-voltage chamber, low-voltage chamber, and main transformer room on the box body as required as ventilation openings. Its function not only increases ventilation effect, but also blocks dust entering the room, ensuring the protection level of the box transformer casing. The shutter screen installed on the threshold to prevent small animals from entering the box from the bottom also serves to protect the normal operation of the internal components of the box. However, the screen screen reduces the effective area of the air inlet to some extent. There is also a fan shutter form that combines the structural advantages of the fan and shutter, which is commonly used in practice

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