Due to lower heat dissipation by non-mineral oil compared to traditional mineral oils, transformer of same kVA will have larger external tank dimensions in KNAN/KNAF design compared to ONAN/ONAF design.Ĭlick to read additional info on FR3 transformer insulating fluid. Non-mineral oil such as FR3 is more expensive compared to traditional transformer mineral insulating oil. Transformers that are required to be installed in explosive areas uses non-mineral oil due to its high ignition point. Non-Mineral oil also increases insulation life of transformer, is more environmentally friendly, is non-toxic, less flammable. KNAN/KNAF transformers uses insulating non-mineral oil that has higher fire point (>300 0C) compared to regular mineral oils (Symbol starts with ‘O’) used on typical oil filled transformers classified as ONAN/ONAF etc. FR3 has exceptionally high ignition point of 360 0C and flash point of 330 0C. It does not contain petroleum, halogens or other harmful materials. Natural esters are made from renewable materials such as canola, soybean etc.Ī common non-mineral oil used in KNAN/KNAF transformers is FR3 which is formulated from edible vegetable oil along with performance enhancing materials. Synthetic esters are manufactured from raw materials and additives are added to tailor its performance to a specific application (such as cold climates).
Transformer ester oils (non-mineral oils) can be classified in to two groups- Synthetic and Natural.
Traditionally transformers have used mineral oils, but industry has now acknowledged the drawbacks of traditional mineral oil namely- flammability, poor biodegradability, low moisture tolerance and corrosive Sulphur. there was only one arrest made at Wrigley on Tuesday night - though it appeared to be unrelated to the brawl in the bleachers.
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