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You have certainly heard of last night's incident in an energy substation of Con Edison in New York, which temporarily left the LaGuardia Airport without electricity and has painted the sky of the city of a mysterious blue light
Con Ed first tweeted a ridiculously discrete commentary • The sky of New York became blue after the explosion of Transformer
To describe the huge explosion seen by thousands, even hundreds of thousands of people: "There was a brief electrical fire at our substation in Astoria, involving electrical transformers and a fall of transport in the region ".
On Friday morning, Con Ed stated that was neither a fire nor a transformer explosion, according to WABC-TV : "The electrical fault of the equipment at 138,000 volts caused a sustained electric arc, whose flash was visible in a large area.The affected equipment was isolated in only one section of the substation. "
Flash arcs get produce when the electric current pbades through a normally nonconductive medium, such as air, in a path between two electrodes. This ionizes the medium and creates an "electric arc" between the electrodes, characterized by high current, high temperature, and visible flash, resulting from ionization. This concept is used in arc welding and was even used in lamps in the late nineteenth century. Although other things say it is not the same thing as lightning, which is a spark or a discharge. The arches are generally kept longer.
The blue color is the result of excited air molecules. If you remember high school, different excited gases release different colors.
"It's a crown," says Peter Sauer, a professor of electrical and computer engineering at the University of Illinois at Gizmodo. "This happens every time there is an arc." A bluish light emanates from the corona discharge on the high-voltage transmission lines, especially in wet weather.It's the ionization of the
Sauer explains that, basically, a short circuit has occurred in a relatively high voltage line. This may have been caused by a failure of insulation, debris or otherwise;
Flash arches are particularly bright and hot, and companies use various methods to prevent the formation of arcs between the electrodes.
It is clear that one of these methods failed. Thursday. As scary as it is, the blue flash was no stranger, nor so unusual. It was just a faulty electrical equipment surrounded by ionized air.
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