Onan transformer images ONAF stands for Oil Natural Air Forced cooling. , 480Y/277 Sec. Each method is illustrated with a diagram: (a) Natural air cooling with radiators (ONAN) Download CAD block in DWG. The major factors responsible for the generation of heat in the ONAN is a form of transformer cooling in which mineral oil is used inside the transformer tank to cool and cool the transformer. O N A F means oil natural air forced 3. O F A F means oil forced air forced Video URL: • Power Transformer Cooling System Radiators Apr 20, 2025 · In this guide, we’ll explore the most widely used transformer cooling techniques including ONAN, ONAF, OFAF, and others. Cooling of transformer is the process by which heat generated in the transformer is dissipated to the safe value. We try our best to provide full details of each item and any included accessories, but if it's not shown in 300 KVA 3-Phase Submersible Distribution Transformer, Vault Mount, 13200V Delta Primary, 240V/120 Delta w/ Center Tap Secondary, Mineral Oil, Copper, 304L Stainless Steel, ONAN, Tap Changer, Light Grey Aug 3, 2024 · Transformer Features: With a transformer rating of 2000 KVA (2 MVA), the industrial transformer features a dual rated primary voltage of three-phase 7200V Delta and a secondary voltage of three-phase 480Y/277 Wye. You’ll learn how each system works, their advantages, and where they are best applied. We compare both methods in this post.