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Explain the operation of silica gel breather. 

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Silica gel breather is used in a transformer to provide dry atmospheric air to the conservator when transformer breathes. The breather consists of an inner container and outer container. The inner container contains silica gel, which absorbs moisture. An oil bath in provided at the bottom of breather so that the silica gel will not be in direct contact with the atmosphere. Also it will trap dust and dirt entering the breather. Dry silica gel will be deep blue in colour. After it gets saturated with moisture it will turn into white pink. The change of colour silica gel can be viewed externally through transparent viewer provided on the breather. When the silica gel is saturated with moisture it must be replaced or regenerated or recharged. Silica gel is recharged by heating it to a temperature of 250º F to 300º F till the deep blue colour of silica gel is got back.

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