What topics are covered in a transformer oil handbook?

A transformer oil handbook usually covers oil functions, insulation and cooling, and the failure mechanisms that oil helps control. It explains common oil families such as mineral, natural ester, synthetic ester, and silicone, plus selection criteria for fire safety and environmental risk. It typically details test methods and interpretation: BDV, moisture, acidity, interfacial tension, resistivity, tan delta, DGA, and furan analysis. It also covers sampling practice, filtration and degassing, regeneration versus replacement, contamination control, storage and handling, and safety topics such as PCB legacy oils and spill response procedures.