What is the acceptable power factor of new mineral oil at 100C for 110kV rated equipment?

In the context of electrical equipment, particularly transformers and other equipment operating with mineral oil insulation, the power factor is a critical parameter that indicates the quality of the insulation system. The power factor, measured at 100°C for new mineral oil, reflects the dielectric losses in the material. A lower power factor indicates better insulation properties and less energy loss.

For 110kV rated equipment, the acceptable power factor for new mineral oil is typically set at 0.40 or less. This standard ensures that the oil provides adequate insulation while minimizing dielectric losses, maintaining efficient operation and longevity of the equipment.

In this scenario, a maximum power factor of 0.40 aligns with industry standards and testing norms, emphasizing the importance of maintaining high-quality insulation in high-voltage applications. Values higher than this threshold could suggest deteriorating insulation, increased losses, and potential reliability issues in the equipment.