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Gas explosion accidents in electrical power plants, can be originated by electrical faults in components containing oil for insulation, such as transformers, junction boxes, etc. A ground discharge can cause the pyrolisis of part of the oil and the production of a gaseous mixture which generates fires or deflagrations in contact with air. A deflagration gives rise to a pressure shock wave which can propagate throughout the underground plant, if not suitably confined. Fluid-dynamic, structural and in some cases fluid-structure interaction analyses are needed to evaluate the overpressures occurring during the blast phenomena and the consequent damages on structural elements.
In the present paper a numerical approach to this kind of problems is proposed and applied to a case study dealing with a typical transformer cell in an underground power plant. The fluid structure interaction code PLEXIS-3C is used to perform both fluid and structural fast dynamic computations.

Additional information

Authors: CHILLE F, ENEL SpA, DSA Structural and Hydraulic Research Centre, Milan (IT);SALA A, ENEL SpA, DSA Structural and Hydraulic Research Centre, Milan (IT);CASADEI F, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 5th International Conference on Structures Under Shock and Impact, CISM Udine (IT), July 3-5, 1996
Availability: Available from (1) as Paper EN 39970 ORA
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