What defines an oil immersed transformer specification?

An oil immersed transformer specification defines electrical ratings and also the full liquid insulation system requirements. It includes kVA or MVA rating, voltage ratio, insulation levels, impedance, vector group, cooling class such as ONAN or ONAF, temperature rise limits, tap range and tap changer type, losses, noise, and short circuit withstand. It also specifies oil type, tank design (sealed or conservator), expansion and pressure relief devices, monitoring instruments, and containment or environmental requirements for the installation.