During normal operation of the transformer, the oil level in the conservator should be in the middle of the oil level gauge. The transformer oil conservator is a component at the bottom of the transformer oil tank, mainly used for heat dissipation and isolation. During normal operation of the transformer, the oil level in the conservator should be maintained at an appropriate level to ensure normal operation and heat dissipation of the transformer. The oil level gauge is a tool commonly used to measure the oil level of transformer conservators. It usually marks different numbers or indicator lights corresponding to different oil levels. The middle position refers to the position where the oil level is at the middle of the scale range of the oil level gauge. Insufficient or excessive oil level in the transformer conservator can affect the normal operation of the transformer, so it is necessary to regularly check and maintain the oil level in the conservator.