Silica gel replacement in a transformer is an essential maintenance task to ensure the effectiveness of the breather system. Silica gel absorbs moisture from the air entering the conservator tank, preventing water contamination in the insulating oil. Over time, the gel becomes saturated with moisture, turning from blue to pink (or orange to green, depending on the type). When this color change is observed, the silica gel must be replaced or reactivated. Timely replacement helps maintain oil insulation quality and prolongs transformer life. Proper sealing and handling during replacement are important to avoid introducing moisture or contaminants into the system.
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