Transformer explosions

Transformer and oil-filled high voltage equipment may give rise to very strong explosions. A severe electrical fault inside the transformer may well generate pressure that the transformer casing cannot withstand, such that it ruptures. Due to the high temperature and energy released from the arc, the insulating oil will decompose and higly explosive gas mixtures will result (mainly Hydrogen and Acetylene). Upon transformer rupture, gas and oil mist will be ejected to the surrounding area, mix with air and a secondary explosion may occur. If transformers are located indoors or in subterranean stations the pressure loads can amount to more than a bar overpressure. In subterranean stations pressure waves may propagate through tunnels and corridors without weakening and pressure loads can become substantial in areas located far away from the actual explosion.

A transformer study will  start out with the the electrical characteristics of the transformer/system so as to derive a set of probable explosion scenarios that will be simulated with FLACS. Further tasks would be to:

  • Establish a realistic geometry model of the transformer room, surrounding rooms and particularly any corridors or tunnels.
  • Perform FLACS explosion simulations of a range of different fault scenarios.
  • Perform risk calculation and describe dimensioning explosion scenario together with an asessment of possible damage to pressure barriers, building structures and personnel. 

    • Reported results would typically involve plots of pressure and pressure wave propagation, drag and flame exposure.



    Contact
    Lars Rogstadkjernet
    Phone no: +47 55 57 43 22
    Email: larsr(at)gexcon.com