A Comparative Study of Transformer Cooling Performance of Fire-Resistant Dielectric Fluids

Fire-resistant hydrocarbon fluids have been used since 1975 in transformers where an extra margin of fire safety is needed. Although they are only one of several types of PCB substitute fluids available, their use has grown steadily, in part due to their safety record and biodegradability. Recent advances in refining and processing technology have greatly decreased the viscosity of these fluids. This study investigates the relationship between fluid viscosity and cooling efficiency with similar hydrocarbon fluids.