The transformer of arc furnace is protected by CO2 fire protections system. The risk of a transformer causing a fire is low, but not negligible and the consequences can be verysevere if it does occur. The aim of fire protection is not to save the transformer but rather to prevent and minimise consequential damages to other plant items located in the vicinity. Apart from passive fire protection, active fire protection system are installed. Deluge system (Water Spray), water mist for open transformers. Inert / Co2 Gas based fire suppression for closed transformers.