The Basics of Arc Flash Fact Sheet v2 GE （电弧闪光简报v2通用电气的基本知识）.pdf

article The Basics of Arc Flash by Cameron G. Clark: GE Specification Engineer Do you know what an arc flash is? If not, keep reading. The goal of this article is to give the reader a basic understanding of what occurs during an arc flash incident, and an understanding of some of the terms used in qualifying the danger associated with such events. What is an Arc Most of us are familiar with an arc. The dictionary describes an electric arc as “a luminous bridge formed in a gap between two electrodes”. An Arc Flash occurs during a fault, or short circuit condition, which passes through this arc gap. The Arc Flash can be initiated through accidental contact, “An Arc Flash event can expel equipment which is underrated for the available short circuit large amounts of deadly energy. current, contamination or tracking over insulated surfaces, The arc causes an ionization of deterioration or corrosion of equipment and, or parts, as well the air, and arc flash as other causes. temperatures can reach as high as 35,000 degrees Fahrenheit. An Arc Flash event can expel large amounts of deadly energy. This is hotter than the surface