By: Sheldon P. Kennedy, PE, IEEE Fellow – skennedy@niagaratransformer.com and Will Mangum – wmangum@nptransformer.com; Niagara Power Transformer Participants will get a review of common power transformer liquids available today and a history of the evolvement of high fire point fluids for transformers. This includes the characteristics of various fluids including mineral oils and high fire point fluids, corrosion from high sulfur compounds in mineral oils, cold temperature applications and maintenance issues of some of the fluids.