Rectification & DC Power Systems
Air-cooled and oil-cooled rectifiers compared
How air-cooled and oil-cooled industrial rectifiers differ in construction, rating, environment, maintenance and footprint.
| Criterion | Air-cooled rectifier | Oil-cooled rectifier |
|---|---|---|
| Construction | Transformer and semiconductors in a ventilated cabinet | Transformer and semiconductors immersed in an oil-filled tank |
| Cooling | Natural or forced air through the cabinet | Oil carries heat to the tank and radiators |
| Typical rating use | Lower to middle current ratings | Middle to high current ratings |
| Suitable environment | Clean, dry rooms or a separate plant room | Fume-laden or humid shops, such as plating areas |
| Exposure of components | Air, dust and fumes reach components | Components sealed from the surrounding air |
| Routine maintenance | Clean filters and air paths; check fans | Check oil level and condition; inspect seals and radiators |
| Installation points | Ventilation and clearance for air flow | Mass, oil containment and lifting arrangements |
Both arrangements are used within the rectifier class, typically 50–5,000 A DC; the method is chosen by rating and environment. The proposal states the cooling arrangement and the conditions it assumes.
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