Technical Paper in TRAFOTECH Global 2025: Evolving Comprehensive Testing Method to Evaluate the Performance of OIP Bushings on Ester Oil Filled Tanks
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With the increasing shift towards environmentally sustainable and more efficient insulating fluids, natural ester and synthetic ester oils are being considered as viable and preferred alternatives to conventional mineral oil in power transformers. The Transformer Bushings used for such Ester Filled Transformers are hermetically sealed Oil- impregnated Paper (OIP) Bushings or resin impregnated paper (RIP) bushings. The OIP bushings are hermetically sealed and are filled with mineral oil. The impact of the ester oils [either natural ester oil (NEO) or synthetic ester oil (SEO) filled in the transformer], on the high voltage performance of the transformer bushings requires comprehensive testing & investigation. The technical paper elaborates on the study to investigate the dielectric performance of OIP transformer bushings (Rating: 72.5 kV 800 A 300 BCT, with Dimensions confirming to IS12676) when mounted on the test tanks filled with NEO and SEO Oils.