Traditional Transformer Protection Limitations

Exploded transformers are generally protected with different protections:

  • Fire walls & Extinguishing system
  • Electrical and mechanical protections, such as Differential, Buchholz relay, Pressure Relief Valve, Rapid Pressure Relay
  • Circuit Breaker

These protections, having all their respective purposes, cannot prevent transformer explosions after the occurrence of an insulation failure. Their respective designs are not adapted to act fast enough to prevent an explosion or limit damages when important fire occurs.

Flexible or/and reinforced transformer tanks have their limitations. The transformer manufacturer of this design has accepted its limitation, being only able to get the tank rupture on the top of the transformer. Such design is limited to the transformer tank and is not designed for On Load Tap Changer and Oil Cable Boxes.

Traditional transformer protections have their limits, and a solution has been developed to prevent transformer explosion and fire.

 The National Fire Protection Association (NFPA) has included the Fast Depressurization System in its Recommendations 850

The TRANSFORMER PROTECTOR is the only proven Fast Depressurization System, as defined by the Recommendation 850 of the National Fire Protection Association.

Alternatives have been proposed, but none has been able to successfully prevent transformer rupture. The potential consequences of a transformer explosion are too severe to invest in non-proven solution to fully secure the assets and its direct environment. This is why a study has been rendered available to help understand the NFPA850 recommendations for Fast Depressurization Systems available here.