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Roadrunner is a 1.38 Pflop/s-peak (double precision) hybrid-architecture supercomputer developed by LANL and IBM. It contains 12,240 IBM PowerXCell 8i processors and 12,240 AMD Opteron cores in 3,060 compute nodes. Roadrunner is the first supercomputer to run Linpack at a sustained speed in excess of 1 Pflop/s. In this paper we present a detailed architectural description of Roadrunner and a detailed...
Research on the convective and radiant arc flash heat transfer process through arc rated protective clothing and equipment and the impact of modified arc testing configurations on the arc rating of PPE is discussed. The effective arc rating of modified PPE designs in high convective heat exposures is also discussed. Recommendations for PPE selection for high convective energy arc flash exposures and...
Low voltage arc flash testing has been conducted using the standard IEEE1584 test procedure, but with the electrode tips terminated in an insulating barrier instead of in the open air. The barrier prevents downwards arc motion, has a stabilizing effect on the arcs, and produces a strong horizontal plasma cloud flow. It also produces shorter arc lengths, higher arcing currents and higher maximum incident...
Low-voltage arc flash testing has been conducted using the standard IEEE 1584 test procedure but modified so that the electrode tips are terminated in an insulating barrier instead of in the open air. The barrier prevents downward arc motion, has a stabilizing effect on the arcs, and produces a strong horizontal plasma cloud flow. It also produces shorter arc lengths, higher arcing currents and higher...
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