How to prevent dust in mining transformer

As one of the key equipments in mine power system, mining transformer is widely used in underground and ground power supply systems. Due to the harsh mine environment, the air often contains a lot of dust, coal dust, moisture and other corrosive substances, which not only affect the normal operation of transformers, but also may lead to safety accidents. Therefore, dust prevention of mining transformer is an important measure to ensure its safe and stable operation.

First, the characteristics and harm of mine environmental dust

Dust in mine environment mainly comes from mining, transportation, crushing and other production processes, and its composition is complex, usually including coal dust, rock dust, metal dust and so on. These dust particles are fine, easily suspended in the air and easily deposited on the surface of equipment. For mining transformers, dust accumulation may cause the following hazards:

1. Influence on heat dissipation performance: Dust accumulation on the surface of transformer or heat dissipation channel will hinder heat dissipation, which will lead to the rise of transformer temperature, thus affecting its insulation performance and service life.
2. Reduce insulation strength: some dust has conductivity or hygroscopicity, which may cause short circuit or insulation breakdown in humid environment.
3. Increase maintenance cost: Frequent dust cleaning not only increases labor and time costs, but also may cause equipment damage due to improper maintenance.

Second, the dust prevention measures

In order to effectively prevent the influence of dust on mining transformers, comprehensive measures should be taken from the aspects of equipment selection, installation location, sealing structure, regular cleaning and environmental management:

1. Choose a transformer with high dust-proof grade.
Mining transformers should choose explosion-proof (Exd) or intrinsically safe (Exi) equipment that meets the national standards, and their shell protection level should generally reach IP65 or above, with good dustproof and waterproof capabilities.

2. Reasonable arrangement of installation position
When installing, try to avoid tuyeres, dust-dense areas and areas with poor ventilation. For the transformer installed underground, it is recommended to set it in a special chamber with good support, moderate ventilation and easy maintenance.

3. Strengthen sealing protection
Regularly check whether the sealing structure of the transformer, such as the sealing ring of the cable lead-in device, the cover plate of the junction box and the observation window, is intact to prevent dust from invading the inside.

4. Regular cleaning and maintenance
Establish a regular cleaning system, and use special tools or compressed air to clean the transformer shell and radiator to avoid dust accumulation. For internal cleaning, it needs to be operated by professionals when the power is off.

5. Improve environmental conditions
Install dust removal equipment or spray dust removal device around the transformer to reduce the dust concentration in the air; At the same time, keep the equipment around dry to prevent dust from caking due to moisture.

Third, the conclusion

To sum up, the dustproof work of mine transformer is an important link to ensure its safe operation and prolong its service life. Only from the aspects of equipment selection, installation layout, structural protection, daily maintenance and environmental management, can we effectively deal with the challenges brought by dust, ensure the stable operation of mine power system and provide solid support for safe production.