What is a fuel oil transformer and how does it differ from power transformers?

“Fuel oil transformer” is not a standard power engineering term for grid equipment. In practice it often refers to an ignition transformer used in fuel oil burners for furnaces and boilers, producing high voltage spark to ignite the burner. This differs from power transformers, which transfer large amounts of electrical power between voltage levels in the grid. Ignition transformers are smaller, designed for short duty HV output, and are integrated into combustion controls rather than transmission or distribution networks.