What is the function of a silica gel breather in power transformers?
The breather serves several important functions in a transformer. First, it helps to maintain the proper insulation properties of the transformer oil. Over time, moisture can enter the transformer oil through the air and degrade the insulation, reducing the transformer’s efficiency and increasing the risk of electrical failures. The silica gel in the breather absorbs moisture from the air and prevents it from entering the transformer oil, helping to maintain the oil’s insulation properties and extend the transformer’s lifespan.
In addition to maintaining the insulation properties of the transformer oil, the breather also helps to equalize the pressure inside the transformer tank. During normal operation, the temperature of the transformer oil and the windings inside the transformer will change, causing the air inside the tank to expand and contract. The breather allows air to flow in and out of the tank, equalizing the pressure and preventing the formation of vacuum or overpressure inside the transformer.
In summary, the function of a breather in a transformer is to maintain the insulation properties of the transformer oil, prevent the ingress of moisture and dust, and equalize the pressure inside the transformer tank. This helps to extend the transformer’s lifespan and improve its performance.
why silica gel is used in transformer breathers?
Silica gel is often used in transformer breathers because of its ability to absorb moisture from the air.
Silica gel is a highly porous material that can absorb large amounts of moisture from the air. It is commonly used in a variety of applications where moisture control is important, such as in desiccant bags for packaging, humidity indicators, and air dryers. In a transformer breather, the silica gel acts as a filter element that absorbs moisture from the air and prevents it from entering the transformer.
In addition to its moisture-absorbing properties, silica gel is also a stable and non-toxic material. It does not react with the transformer oil or other components in the transformer, making it a safe and effective choice for use in transformer breathers.
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