Silica Gel Breather for Transformer All power transformers have a conservator part, which holds the insulating oil for the transformer. The purpose of the insulation oil is to safeguard all parts of the transformer from current surges. The oil runs through the length and breadth of the transformer. A silica gel breather design is simple and easy to install. The arrangement is placed inside the transformer conservator and includes a pot or tube filled with fresh silica gel. This is placed above the oil level, to remove maximum moisture from the air. By protecting the insulating oil, silica gel assures insulation to the entire transformer parts.