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Three-phase medium voltage oil-immersed transformers use ONAN (Oil Natural Air Natural) cooling. This means these transformers use oil to extract heat from the transformer core and dissipate it naturally into the air, without the assistance of fans.
Like cast resin dry-type transformers, they are typically used in high and very high power installations. Voltages range from a few kilovolts to a few tens of kilovolts in industrial environments.
These electrical transformers feature substantial galvanic isolation, ranging from several tens to hundreds of kilovolts (kV), depending on the voltage values applied to the selected products. Medium voltage oil transformers play a key role in separating electrical networks and are typically used as step-down transformers to convert the high and medium voltages (11kV, 15kV, 20kV or 30kV) of electrical networks into usable voltages of around 400V, 690V or 800V three-phase, in businesses or large professional electrical installations.
In its standard Dyn11 coupling configuration, meaning with a star-connected secondary, they also allow the creation of a neutral point, preventing the phenomenon of floating phase voltages that can damage electrical installations or machines. The three-phase medium voltage transformer is essential and guarantees the safety of your electrical distribution.
Le Cosinus offers Medium Voltage oil-immersed transformers that we have carefully selected and validated for their quality and reliability. They comply with IEC 60076 and Ecodesign standards.
Specific voltages, particular power ratings, low or high frequency, special integration conditions or configurations: if your project does not match a standard reference, our teams will support you in designing a custom transformer.
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