How do you take an oil sample from a transformer?

To take an oil sample from a transformer, first ensure safety by wearing appropriate personal protective equipment and turning off the transformer if necessary. Locate the sampling valve or tap on the transformer, usually found at the bottom of the tank where sediment might settle. Clean the area around the sampling valve to prevent contamination. Prepare a clean, dry sampling container, preferably a glass or plastic bottle with a tight seal. Open the sampling valve slowly to avoid splashing and allow the oil to flow into the container, filling it to about two-thirds capacity. While sampling, ensure that no air bubbles are trapped in the oil sample as they can affect the analysis. Once the sample is taken, securely close the valve and seal the container tightly to avoid any leakage. Label the container with necessary information such as date, time, and location, and store it in a cool, dark place before sending it to a laboratory for analysis. Following these steps helps ensure the quality and reliability of your oil sample from the transformer.