Transformer Protector MTP Type protecting 2 transformer tanks with one common Oil Gas Separation Tank Transformer Protector™ Explosion Prevention System   Principles The Transformer Protector™ is a concept that can be applied to all oil-filled transformers 0.1MVA and larger. Click for document #8. It serves to: • Depressurize tanks within milliseconds • Avoid contact between air (oxygen) and the evacuated explosive gases (primarily acetylene) • Separate gases from the oil • Channel the flammable gases away from the transformer to a safe location • Eliminate explosive gases in the transformer by injecting an inert medium (nitrogen) into the transformer and associated equipment • Quickly bring the transformer to a safe condition • Minimize the danger to responding plant personnel and fire fighters • Eliminate oil spills and possible contamination of ground water and waterways • Minimize secondary damage to the transformer and associated equipment and provide a repairable piece of equipment • Minimize the downtime associated with transformer replacement • Minimize the high costs associated with purchasing replacement power • Minimize or eliminate disastrous public relations issues Transformer Protector™ is a passive mechanical system, which can only be activated by the level of transformer tank internal pressure reached during short-circuits. The system has proven its high reliability. There have been no reported cases of spurious operation of the Transformer Protector System. Close investigation of the Transformer Protector control system quickly reveals the soundness of the design logic and that spurious operation is virtually impossible. 1-2 Transformer and On Load Tap Changer Depressurization Sets All Depressurization Sets include a Rupture Disk to relieve overpressure and a Decompression Chamber to assure high-speed depressurization. Their diameter is calculated individually for each transformer and On Load Tap Changer types. In addition, each transformer tank ‘Depressurization Set’ includes an Isolation Valve and an Expansion and Vibration Absorber.   A - Isolation Valve Flange B - Isolation Valve C - Absorber D - Rupture Disk E - Decompression Chamber 3-4 Transformer and On Load Tap Changer Explosive Gases Elimination Sets They create a safe environment inside the transformer and On Load Tap Changer oil capacities by injecting manually or automatically a strong nitrogen flow, after depressurization occurs. The risk of incident after the Transformer Protector operation for maintenance is therefore avoided. 5-6 Oil-Gas Separation Set The Oil-Gas Separation Tank (5) collects the mixture of the depressurized oil and flammable gases. Then it separates flammable gases from the oil. The flammable gas is then channeled through the Explosive Gas Evacuation Pipe (6) to a safe location. Within reasonable spacing limits, one Oil-Gas Separation Set may be used with multiple transformers. 7 Conservator Shutter When unusual oil flow from the conservator is detected, the Conservator Shutter will close automatically and prevent the conservator from draining. With the addition of a Conservator Shutter, it is not necessary to oversize the Oil-Gas Separation Tank to accommodate the oil from the conservator. 8 Control Panel Located in the plant Control Room or Relay House, the Control Panel ensures the logic of the system. The Control Panel interfaces with all transformer protection systems and to the Transformer Protector. CAUTION TPC does not recommend to limit the amount of conventional mechanical or electrical protection devices when the Transformer Protector is used.