Transformer Oil Coolers

Transformer Oil coolers are heat exchangers used to cool the dielectric oil in power, distribution and furnace transformers. These coolers are designed based on customer requirements. A typical transformer oil cooler is made of copper tubes and brass tube sheets.

TOP OIL RISE (TOR) OR AVERAGE OIL RISE (AOR): Unlike heat exchangers in other applications, the oil temperature is expressed as a rise in relation to the cooling water or air temperature. If the Top Oil Rise (TOR) is given, the temperature represents the number of degrees that the hot oil is great than the cooling water or air temperature.

If the Average Oil Rise (AOR) is given, the temperature represents the number of degrees that the average oil temperature is greater than the cooling water or air temperature. The average oil temperature is simply the cooler inlet oil temperature minus the cooler outlet oil temperature divided by two.

HEAT LOAD:
The other parameter that is required to size a transformer oil cooler in all applications is the heat load or total losses in the transformer. The heat load is a function of the load and no-load losses in the transformer and is typically expressed in kW. The heat generated by the transformer losses is picked up by the oil and the heat is removed from the oil by the heat exchanger.

Transformer Oil Cooler
Transformer Oil Cooler

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