As the volume of transformer oil expands or decreases with temperature, the oil conservator regulates the oil level, ensuring the transformer tank is always full.
Without an oil conservator, fluctuations in the oil level within the tank can have several negative consequences:
First, when the oil level drops, the exposed core and coils affect heat dissipation and insulation.
Second, as the oil level fluctuates, air is drawn in and out through the gaps in the tank cover. Because the upper oil layer is hotter, the oil quickly oxidizes and absorbs moisture. The oil level in the oil conservator is smaller than that in the tank, minimizing the contact surface between the oil and air and preventing excessive oxidation and moisture.
Third, the oil in the oil conservator rarely participates in the tank’s circulation. Its temperature is much lower than that of the upper oil layer, and the oil oxidation process is much slower. Therefore, the oil conservator prevents excessive oxidation.
There are three types of oil conservators: corrugated transformer type, capsule type, and diaphragm type
To completely isolate the transformer oil level from the air, the capsule-type conservator uses an oil level gauge to indirectly display the oil level. This conservator utilizes a small capsule at the bottom of the conservator, creating a separate oil circulation system. When the conservator’s oil level rises, the pressure of the oil column pressing on the capsule increases, reducing the volume of the capsule. Consequently, the oil level reflected on the oil level gauge rises, and its height is proportional to the conservator’s oil level. Conversely, when the conservator’s oil level drops, the pressure of the oil column pressing on the capsule decreases, causing the capsule’s volume to increase. This results in the oil level reflected on the oil level gauge falling, and its height is proportional to the conservator’s oil level. In other words, fluctuations in the conservator’s oil level cause changes in the pressure in the capsule, indirectly and proportionally reflecting the changes in the conservator’s oil level.
For diaphragm oil conservators, a magnetic oil gauge can be installed. The roller of the oil gauge linkage mechanism is not subject to any resistance on the film and can be extended and shortened freely and flexibly. There is a junction box on the top of the magnetic gauge with a switch inside. When the oil level of the oil conservator reaches the highest or lowest position, the switch automatically closes and sends out an alarm signal.
Post time: Jul-29-2025
