SERGI - Principles

TRANSFORMER PROTECTOR


	How the TRANSFORMER PROTECTOR works

Explosion Prevention

Principle
1.Pressure rises.
2.Depressurisation Set activation.
3.Instantaneous Depressurisation.
4.Oil-Gas mixture evacuation to the Oil-Gas Separation Tank.
5.Conservator Shutter closes.

6.Oxygen cannot be in contact with the self flammable oil-gas mixture as the Air Isolation Shutter is closed.
7.If automatic, one of the Depressurisation Set Burst indicators, in addition to any electrical protection, initiates nitrogen injection.
8.To protect people from explosion during opening of the tank for intervention after the incident, manual or automatic nitrogen injection ends explosive gas generation.
9.Explosive and flammable gases open the Air Isolation Shutter and are channelled to a remote area or outside the building.

10.For security, the protected oil capacities are immediately confined under a safe nitrogen atmosphere.
11.Nitrogen injection runs 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 Diagram

Explosion Prevention

As soon as a critical level of pressure is reached inside a transformer oil capacity protected by the TRANSFORMER PROTECTOR, the Depressurisation Set is mechanically activated without actuator, which enables an instantaneous depressurisation. When activated, a signal is sent to the Control Box, which, in addition to one of the transformer electrical protections, initiates an alarm for manual activation or automatic start-up of the Explosive Gas Elimination Set.

Fire Extinction

The Nitrogen Drain and Stir Fire Extinguishing system is used as back-up to the TRANSFORMER PROTECTOR explosion prevention. 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 protections