The oil pillow of the oil-filled distribution transformer is mainly responsible for the oil replenishment and oil storage of the transformer. It is installed at the highest position of the oil level of the oil-filled distribution transformer, mainly including the oil pillow body, the rubber air bag, and the oil level gauge. , Oil pillow body and rubber bag pass through pipelines, etc. The oil pillow body includes oil injection valve, oil discharge valve, exhaust valve, sampling valve; when the load increases, the temperature of the oil-filled distribution transformer rises, and the expansion of the insulating oil makes the A part of the insulating oil in the oil tank flows into the oil pillow, and the air occupied by the oil pillow will be discharged through the trachea and the respirator. When the load drops, the temperature of the transformer will decrease, and the density of the insulating oil will increase, so that a part of the insulating oil in the oil pillow will flow into the oil pillow. Refill the fuel tank.

The oil level gauge of the oil-filled distribution transformer is a disc oil level gauge, which mainly reflects the oil level in the oil pillow. When the oil in the oil pillow changes, the float in the oil pillow will move up and down with the change of the oil level, and the float link will drive the gear into the rotation of the oil level gauge rotor outside the oil pillow, which is bound to the stator magnet (permanently). The pointer on the magnet) rotates the corresponding angle through the rotation of the rotor magnet, and the low oil level alarm is reflected through the electrical contact. The oil level gauge of the oil-filled distribution transformer has a total of 10 scales to reflect the oil level in the oil pillow. When the oil level pointer indicates 0, the main transformer low oil level alarm signal will be issued.