What tests are standard for mineral oil analysis?

The standard tests for mineral oil analysis focus on assessing the oil's physical and chemical properties, which are critical for ensuring its effectiveness in insulating and cooling electrical equipment. The correct choice includes tests for color, acidity, interfacial tension, power factor, and moisture content.

Color is an important visual indicator of the oil's condition and can reveal the presence of contaminants or degradation products. Acidity levels can indicate the degradation of the oil and the formation of acidic byproducts that could be harmful to equipment. Interfacial tension provides insights into the oil's ability to separate from water and other foreign substances, which is vital for maintaining insulating properties. The power factor assesses the oil's dielectric properties, reflecting how well it can insulate against electrical currents. Lastly, moisture content is a critical factor, as water can significantly impair the oil's insulating effectiveness and can lead to other issues such as corrosion or increased dielectric stress.

This comprehensive suite of tests ensures that the mineral oil performs optimally within electrical systems, highlighting the relevance of the chosen answer in routine maintenance and reliability assessments of oil-filled equipment.