What is the process for oil testing of transformers, and can you provide a PDF on it?

The process for oil testing of transformers involves several key steps, including sampling, laboratory analysis, and interpretation of results. Samples are taken from the transformer oil and subjected to tests such as dissolved gas analysis (DGA), moisture content measurement, and dielectric strength assessment. These tests help identify potential issues like insulation degradation or contamination. For a detailed guide, please refer to industry standards or technical documents available in PDF format from reputable sources.