What are the specifications for 11kV transformer oil?

The specifications for 11kV transformer oil typically include a minimum breakdown voltage of 30 kV, a flash point of at least 140�C, and a viscosity at 40�C not exceeding 20 cSt. Additionally, the oil should have low water content, generally below 30 ppm, and a dielectric dissipation factor (tan ?) of less than 0.005. These specifications ensure optimal performance and safety in power transformers operating at 11kV.