China Oil Immersed Transformer Supplier-Factory

Oil Immersed Transformer: Technical Guide for Power Distribution Systems An oil immersed transformer is a power transformer that uses insulating oil as both a cooling medium and dielectric insulation. It is widely applied in utility substations, industrial power networks, renewable energy plants, and outdoor distribution systems. The insulating oil absorbs heat generated during operation and transfers it through the tank and radiators, helping maintain stable winding temperature under continuous load. The main components include a laminated steel core, copper or aluminum windings, a sealed tank, insulating oil, radiators or cooling fins, a conservator, a breather, pressure relief devices, and temperature monitoring instruments. The oil provides electrical insulation between live parts and improves heat dissipation. Modern designs often use sealed tanks or nitrogen cushion systems to reduce oil oxidation and moisture absorption, which helps extend service life. Oil immersed transformers are available in single-phase and three-phase types, covering distribution and power transformer applications. Common cooling methods include ONAN, ONAF, and OFAF, depending on capacity and operating conditions. They are suitable for outdoor installation, high-load environments, and long-distance power transmission. Because oil is flammable, installation must follow fire safety regulations, clearance requirements, and environmental protection standards. Key selection parameters include rated power, voltage ratio, frequency, impedance, vector group, efficiency class, temperature rise, short-circuit withstand capability, and environmental conditions. Proper specification helps reduce no-load loss and load loss while improving system reliability. Routine maintenance should include oil testing, dissolved gas analysis, insulation resistance measurement, cooling system inspection, and leakage checks. When designed, installed, and maintained correctly, an oil immersed transformer provides stable performance for long-term electrical distribution.

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