1. To allow for the thermal expansion and contraction of transformer oil, ensuring that the transformer tank is always full of oil under any temperature and operating conditions.
2. To ensure that the transformer core and the lower part of the bushings can be reliably immersed in oil, guaranteeing operation and allowing for smaller bushing design dimensions.
3. Transformer oil only comes into contact with air in the conservator tank (some are also equipped with a capsule-type breather), reducing the contact area with air, which in turn reduces the chance of moisture absorption and oxidation. The oil temperature in the conservator tank is lower than that in the main tank, slowing the oxidation process and helping to delay oil aging.
4. A gas relay can be installed in the connecting pipe between the conservator and the tank.
5. Moisture absorbed by the transformer oil from the air will settle in the bottom collector of the conservator tank for regular discharge, preventing water from entering the main tank.
