Transformer Oil Coolers For Power Plant

Transformer Oil Coolers for Power Plant

Working Principle
Natural cooling: using natural convection, transformer operation generates heat to warm up the oil, hot transformer oil in the radiator through radiation and convection will heat to the surrounding environment. cooled oil then flow back to the transformer, forming a cycle.
Forced cooling: through the fan, oil pump and other equipment to accelerate the heat distribution. The fan will blow the cold air through the radiator, or the oil pump will send the hot oil to the external cooler and cooling water for heat exchange, quickly reducing the oil temperature.

Common Types
Oil-immersed self-cooling type (ONAN): rely on the natural convection of oil and oil tank surface radiation, natural convection heat dissipation, without external power equipment, simple structure, low maintenance costs, applicable to small capacity transformers.
Oil-immersed air-cooled (ONAF): on the basis of oil-immersed self-cooling, increase the fan blowing on the radiator to improve the cooling efficiency, can be operated under natural ventilation and air cooling, suitable for medium-capacity transformers.
Forced oil circulation cooling type (ODAF or ODWF): using oil pump to force hot oil to external cooler, cooling by blowing air (ODAF) or cooling with water (ODWF), good heat dissipation effect, used for large capacity transformers.