Silica Gel in a Power Transformer
Below is a photo of a silica gel that is being used to purify or dry the air that goes in the conservator tank of a power transformer.
A power transformer, literally, breaths through the conservator tank because of the thermal expansion of the insulating oil inside. The air that goes inside the conservator tank, however, is isolated by a diaphragm inside the conservator to avoid contact and contaminating the oil.
Pink colored silica gel indicates that the gel is moist and already used up and may need drying or replacement. A new or dried silica gel has bluish color.
Posted in Transformers and Accessories