Industry standards emphasize matching heat load with cooling capacity.
Selecting Cooling Method and Radiator Type Based on Transformer Capacity
Transformer capacity directly determines the amount of heat generated and is the primary basis for selection:
Small Transformers (≤100kVA): With low heat generation, natural oil-air circulation (ONAN) cooling is preferred, and a plate-type radiator is sufficient to meet cooling requirements. Simple structure, no auxiliary equipment energy consumption, suitable for residential areas or small power distribution scenarios.
Medium Transformers (100kVA～630kVA): Increased heat load, oil-immersed air cooling (ONAF) is recommended. This involves adding a fan to a plate-type radiator to force air convection, improving cooling efficiency by approximately 30%～50%.
Large transformers (>630kVA), especially those above 1000kVA, must use forced oil-air cooling (OFAF) or water cooling (ODAF), along with large-size, high-number plate radiators, to ensure that the temperature rise is controlled within 60K.
