Oil-immersed transformer - Features

Oil-immersed transformers: to rely on oil as a cooling medium, such as oil-immersed self-cooled, oil cooled, oil  circuit breakers and forced oil circulation. General step-up substation main transformer are immersed, the  mcb circuit breaker  ratio 20KV/500KV, or 20KV/220KV, generally used to drive with its own power plant load (such as mills, induced draft fan, blower, circulating pumps, etc.) of auxiliary transformer is oil-immersed transformers, it turns ratio is 20KV/6KV