How do you read a transformer oil level gauge?

To read a transformer oil level gauge, first ensure the transformer is de-energized and safe for inspection. Locate the gauge, usually found on the side of the transformer, which may be a sight glass or float type. For a sight glass, observe the oil level through the transparent section; the level should be between the minimum and maximum markings. Ensure the temperature is appropriate, as oil expands with heat, which can affect the reading. For a float gauge, check the position of the float indicator on the scale; it will show the oil level relative to calibrated markings. Regularly monitoring this gauge is essential for maintaining transformer performance.