SERGI “Société Générale d’Etudes et de Réalisations Industrielles” was created in 1955 for the design and manufacture of oil-filled transformer fire extinguishing systems. Since then, the company has been specialised in the transformer fire protection business.

In 1957, SERGI and Electricité de France invented the Transformer Nitrogen “Drain and Stir” Fire Protection.

The SERGI TRANSFORMER PROTECTOR is a concept that can be applied to all oil-filled transformers up to 1 000 MVA and larger.It serves to:

• Depressurise tanks within milliseconds
• Avoid contact between air (oxygen) and the evacuated explosive gases (Hydrogen, Acetylene, etc.)
• Separate gases from the oil
  Channel the flammable gases away from the transformer to a remote area
• Eliminate explosive gases in the transformer by injecting an inert medium (Nitrogen)
  into the tank and associated equipment
• Quickly bring the transformer to a safe condition for repair after a short -circuit