— NFPA —


With major losses involving large oil-cooled transformers continuing to occur on a frequent basis, fast depressurization systems are now recommended by the National Fire Prevention Association for all power plants and substations.

The NFPA defines fast depressurization system as a passive mechanical system designed to depressurize the transformer a few milliseconds after the occurrence of an electrical fault.

For exact details, see the NFPA 850 and NFPA 851 files.

NFPA 850
Recommended Practice for Fire Protection for Electric Generating Plants and High Voltage Direct Current Converter Stations View PDF
NFPA 851
Recommended Practice for Fire Protection for Hydroelectric Generating Plants View PDF