How the Transformer Protector Works Principle 1. Pressure rises. 2. Depressurization Set activation 3. Instantaneous Depressurization 4. Oil-Gas mixture evacuation to the Oil-Gas Separation Tank. 5. Conservator Shutter closes. 6. The Air Isolation Shutter prevents oxygen from coming in contact with the flammable oil-gas mixture. 7. Nitrogen injection may be initiated either manually or automatically when the Control Panel receives indication that the Depressurization Set rupture disc has burst and that the transformer has been de-energized. 8. To protect personnel from fire and explosion before opening of the transformer after an incident, manual or automatic nitrogen injection ends explosive gas generation. 9. Explosive and flammable gases open the Air Isolation Shutter and are channeled to a remote area or outside the building. 10. The protected oil capacities are immediately confined under a safe nitrogen atmosphere. 11. Nitrogen injection continues for 45 minutes to ensure the cooling of the protected oil capacities. 12. Damaged parts can be repaired safely as the tank is free from explosive gases.   Logic Diagrams   Explosion Prevention Logic Diagram As soon as a pre-determined critical pressure level is reached inside any area of the transformer protected by the Transformer Protector, the Depressurization Set is activated without actuator, resulting in an instantaneous depressurization. When activated, a signal is sent to the Control Panel. Upon receipt of a second signal from the transformer protection system, such as Bucholz, sudden pressure, ground fault, initiates an alarm for manual activation or automatic activation of the nitrogen injection system. Fire Extinction Logic Diagram The Nitrogen Drain and Stir Fire Extinguishing system is used as back-up to the Transformer Protector explosion prevention system. The Fire Extinction is activated manually or automatically when a signal is received by the Linear Heat Detector and by one of the transformer electrical protection devices. PEOPLE SAFETY Customers can choose between manual or automatic nitrogen injection to eliminate explosive gases after the incident.